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Inventors
Parsons, Kevin L.
Boda, James
Application #
025000
Filed
Dec-18-2001
Published
Mar-28-2006
Current US Class
030/115
030/162
030/241
030/278
030/286
International Classes
A21C 5/00 (20060101); B26B 13/12 (20060101)
Field of Search
30/153 30/241 30/278 30/115 30/162 30/286 30/319 30/292 30/242 30/113 30/109 30/335
Examiners
Shoap; Allan N.
Attorney, Agent or Firm
Welsh & Katz, Ltd.
US Patent References
| 4791725 |
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Sheathed scissors |
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| 5218765 |
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Pipe cutter |
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| 5373639 |
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Pipe cutter |
|
Referenced by:
View Backward References
Citation
Cite This Patent
More From Subclass 162
More From Class 030
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Abstract
A cutting device having a head member having a movable cutting blade positioned therein, first and second legs pivotally mounted on said head member, a connector connecting the first leg, the cutting blade, and the second blade, wherein the connector and cutting blade are movable within a slot in the head member to bring the cutting blade into cutting engagement with a shield connected to said head member when the legs are moved into a closed position.
Claims
The invention claimed is:
1. A cutting device for severing plastic restraints comprising:
a head member having a cutting blade disposed therein, having a pin receiving slot and having a transverse slit for receiving said cutting blade;
first and second legs pivotally mounted to said head member;
a connector pin received in said slot and operatively connecting said first leg and said cutting blade;
said cutting blade being movable within said slit along an axis and said slot lying generally on said axis;
a shield portion connected to said head member and being disposed in a path of said cutting blade and said shield portion including a cutting surface;
said head member having a cutting chamber defined between said shield portion and said head member for placement of the plastic restraints to be severed;
said cutting blade having a cutting surface movable into said cutting chamber when said first and second legs are pivoted from an open position to a closed position and out of said cutting chamber when said first and second legs are pivoted to an open position, causing said connector pin to move in said slot generally along an axis of said slot to cause said cutting blade to move in and out of said slit and in and out of said shield portion.
2. The cutting device of claim 1, wherein the cutting blade has an outer contact point and angled cutting surfaces extending from either side of the outer contact point and wherein the outer contact point of the cutting blade is positioned such that the outer contact point of the cutting blade contacts the restraint when the restraint is positioned within the cutting chamber.
3. The cutting device of claim 2, wherein when the legs are moved into their closed position the cutting blade severs the restraint from where the cutting blade contacts the restraint towards the sides of said restraint.
4. The cutting device of claim 3, wherein a central portion of said restraint is positioned in the path of an outer cutting tip of the cutting blade.
5. The cutting device of claim 3, wherein the cutting blade is upwardly angled from the enclosed end of the cutting chamber whereby the restraint is pinned between the cutting blade and the enclosed end and the restraint is severed from a first side of the restraint to a second side of the restraint located nearer to the enclosed end of the chamber.
6. The cutting device of claim 1, wherein a key ring is formed between the legs when the legs are in a closed positioned.
7. A cutting device comprising:
a head member having a top side, left and right sides, left and right side edges and including a plate portion and a thicker shield portion, and said plate portion having a transverse slit for housing a cutting blade;
a first leg pivotally mounted to one side of said head member and an opposed second leg pivotally mounted to another side of said head member;
a cutting blade positioned within said transverse slit,
said head member having a cutting chamber between said shield portion and said plate portion and said transverse slit extending in said plate portion away from said cutting chamber;
a connector pin operatively connecting said first leg and said cutting blade and being slidably received in an elongate slot in said plate portion;
said shield portion having a cutting surface positioned opposite said transverse slit; and
each of said legs having a bifurcated upper end defining a slot which receives said plate portion of said head member so that, when said first and second legs are in an open position, said cutting blade is in a retracted condition within the transverse slit in said plate portion of said head member, and when said first and second legs are pivoted on said head member to a closed position, said connector pin is caused to move in said elongate slot generally along an axis of said slot to cause said cutting blade to move relative to said transverse slit and across said cutting chamber into cutting engagement with the cutting surface of said shield portion.
8. The cutting device of claim 7, wherein when the first and second legs are moved into a fully closed position, the cutting blade extends into a corresponding slit positioned in the shield portion opposite the transverse slit in the head member.
9. The cutting device of claim 8, wherein the cutting blade has a centrally located cutting tip.
10. The cutting device of claim 9, wherein said cutting tip is located in axial alignment with said elongate slot.
11. The cutting device of claim 8, wherein the cutting blade is angled upwardly away from an enclosed portion of said cutting chamber.
12. The cutting device of claim 7, wherein a guide is located in said transverse slit, said guide is on either side of the cutting blade, and wherein said cutting blade rides between said guide during movement.
13. A cutting device comprising:
a head member having a top side, left and right sides, left and right side edges and having a transverse slit for housing a cutting blade;
a shield portion connected to said head portion;
a first leg pivotally mounted to one side of said head member and an opposed second leg pivotally mounted to another side of said head member;
a cutting blade positioned within said transverse slit;
said head member having a cutting chamber below said shield portion and said transverse slit extending in said head portion away from said cutting chamber;
a connector operatively connecting said first leg and said cutting blade and being slidably received in an elongate slot in said head member;
said shield portion having a cutting surface positioned opposite said transverse slit;
so that, when said first and second legs are pivoted on said head member to a closed position, said connector is caused to move in said elongate slot causing said cutting blade to move relative to said transverse slit and across said cutting chamber into cutting engagement with the cutting surface of said shield portion;
a guide being located in said transverse slit, said guide being on either side of the cutting blade;
and said cutting blade riding between said guide during movement of said cutting blade and said guide being defined by two, parallel spaced pins in said transverse slit that are made of stainless steel.
14. A cutting device comprising:
a head member having a top side, left and right sides, left and right side edges and including a plate portion and a thicker shield portion outwardly of said plate portion, and said plate portion having a transverse slit for housing a cutting blade,
a first leg pivotally mounted to one side of said head member and an opposed second leg pivotally mounted to another side of said head member;
a cutting blade positioned within said transverse slit,
said head member having a cutting chamber between said shield portion and said plate portion and said transverse slit extending in said head member away from said cutting chamber;
a connector pin operatively connecting said first leg and said cutting blade and being slidably received in an elongate slot in said plate portion;
said shield portion having a cutting surface positioned opposite said transverse slit
so that, when said first and second legs are in an open position, said cutting blade is in a retracted condition within the transverse slit in said head member, and when said first and second legs are pivoted on said head member to a closed position, said connector pin is caused to move in said elongate slot generally along an axis of said slot to cause said cutting blade to move relative to said transverse slit and across said cutting chamber into cutting engagement with the cutting surface of said shield portion and, when the legs are in the closed position, the legs form a key ring opening between the legs at an end of the cutting device opposite of the shield portion.
15. A cutting device comprising:
a head member having a top side, left and right sides, left and right side edges and having a transverse slit for housing a cutting blade;
a shield portion connected to said head member;
a first leg pivotally mounted to one side of said head member and an opposed second leg pivotally mounted to another side of said head member;
a cutting blade positioned within said transverse slit,
said head member having a cutting chamber below said shield portion and said transverse slit extending in said plate portion away from said cutting chamber;
a connector pin operatively connecting said first leg and said cutting blade and being is slidably received in an elongate slot in said head member;
said shield portion having a cutting surface positioned opposite said transverse slit
so that, when said first and second legs are in an open position, said cutting blade is in a retracted condition within the transverse slit in said head member, and when said first and second legs are pivoted on said head member to a closed position, said connector pin is caused to move in said elongate slot generally along an axis of said slot to cause said cutting blade to move relative to said transverse slit and across said cutting chamber into cutting engagement with the cutting surface of said shield portion and a first leg extension being movable within said first leg from a first retracted position to a second extended position and a second leg extension being movable within said second leg said second leg extension is movable from a first retracted position to a second extended position.
16. The cutting device of claim 15, further including locking means for locking the legs in a closed position when the first and second leg extensions are positioned in the first retracted position.
17. The cutting device of claim 16, wherein one of the leg extensions includes a latch, wherein when said leg extension is moved into its first retracted position when the legs are in the closed position, the latch engages a portion of the other leg extension wherein the legs become locked in the closed position.
18. A cutting device comprising:
a head member having a top side, left and right sides, left and right side edges and having a transverse slit for housing a cutting blade;
a first leg pivotally mounted to one side of said head member and an opposed second leg pivotally mounted to another side of said head member;
a cutting blade positioned within said transverse slit;
said head member having a cutting chamber between said shield portion and said plate portion and said transverse slit extending in said head portion away from said cutting chamber;
a connector operatively connecting said first leg and said cutting blade and being slidably received in an elongate slot in said head member;
said shield portion having a cutting surface positioned opposite said transverse slit,
so that, when to said head member is moved to a closed position, said connector is caused to move in said elongate slot generally along an axis of said slot to cause said cutting blade to move relative to said transverse slit across said cutting chamber into cutting engagement with the cutting surface of said shield portion, and one of the leg extensions including a J-shaped latch, wherein when said leg extension is moved into its first retracted position when the legs are in the closed position, the latch engages a portion of the other leg extension wherein the legs become locked in the closed position.
19. The cutting device of claim 7, wherein said cutting surface of said shield portion is positioned 0.25 inches or less from said plate portion of said head member across said cutting chamber.
20. A cutting device comprising:
a head member having a slot therein and a transverse slit and having a cutting blade disposed in said slit in said head member;
first and second legs each being pivotally mounted to said head member;
a connector pin operatively connected to one leg and to said cutting blade, being received in said slot and being operative to move the cutting edge of said cutting blade in and out of said slit in said plate portion of said head member on pivotal movement of said first leg;
a shield portion being connected to said head member and being disposed in a path of said cutting blade, said shield portion including a cutting surface and a cutting chamber being defined between said head member and said shield portion, so that, when said first and second legs are in an open position, said cutting blade is in a retracted condition generally within said slit in said head member, and when said first and second legs are pivoted on said head member to a closed position, said connector pin is caused to move in said slot in said head member generally along an axis of said slot to move said cutting blade in a direction toward said shield portion and when the first and second side legs are in said closed position an outer portion of said cutting blade extends into said shield portion.
21. The cutting device of claim 20, wherein said cutting surface is triangular.
22. The cutting device of claim 20, wherein the cutting blade is positioned between a guide located within the slit in the head member.
23. The cutting device of claim 22, wherein said guide comprises two parallel pins that are made of stainless steel.
24. The cutting device of claim 20, wherein when the legs are in the closed position, the legs form a key ring opening.
25. The cutting device of claim 14, the cutting chamber has a width of less than 0.25 inches.
26. A cutting device comprising:
a head member having a slot therein and a transverse slit and having a cutting blade disposed in said slit in said head member;
first and second legs each being pivotally mounted to said head member;
a connector pin operatively connected to one leg and to said cutting blade, being received in said slot and being operative to move the cutting edge of said cutting blade in and out of said slit in said plate portion of said head member on pivotal movement of said first leg;
a shield portion being connected to said head member and being disposed in a path of said cutting blade so that, when said first and second legs are in an open position, said cutting blade is in a retracted condition generally within said slit in said head member, and when said first and second legs are pivoted on said head member to a closed position, said connector pin is caused to move in said slot in said head member generally along an axis of said slot to move said cutting blade in a direction toward said shield portion and said cutting device further including a first leg extension movable within said first leg from a first retracted position to a second extended position and a second leg extension movable within said second leg from a first retracted position to a second extended position.
27. The cutting device of claim 26, further including locking means for locking the legs in a closed position when the first and second leg extensions are positioned in the first retracted position.
28. The cutting device of claim 26, wherein one of the leg extensions includes a latch, and when said leg extension is moved into its first retracted position when the legs are in the closed position, the latch engages a portion of the other leg or leg extension and the first and second legs become locked in the closed position.
29. The cutting device of claim 28 wherein said latch is J-shaped.
Description
BACKGROUND OF INVENTION
1. Field of Invention
This invention is directed generally to a cutting device, and more particularly to a cutting device having a pair of opposed legs pivoting about a head member and connected to a cutting blade. The cutting device of the present invention is particularly useful for cutting plastic restraints, cable ties, and the like.
2. Background of the Invention
Restraining devices such as handcuffs are well-known and have been available for many years. The best known restraining devices are handcuffs consisting of a pair of metal rings which are placed about the wrists of an individual and locked into place. While traditional handcuffs serve the purpose of restraining an individual, they have a number of drawbacks. Conventional handcuffs are heavy, bulky to carry, expensive, require a key and are often inconvenient, particularly in multiple arrest situations such as riots and the like.
Because of these drawbacks, it has become more and more desirable to design handcuffs or restraints which are lightweight, inexpensive and do not require a key. Moreover, it has become desirable to utilize disposable restraints, particularly in multiple arrest situations such as mass arrests of demonstrators and gangs.
Further, there has been a movement toward using disposable restraints due to the increasing concern of the spreading of AIDS, as well as Hepatitis, since restrained individuals who struggle violently often create open wounds which result in blood on the handcuffs. Disposable restraints assure that the handcuffs will not be reused and thereby cannot create a carrier for communicable diseases through contamination due to cuts or abrasions received during the detainment.
One type of disposable restraint is described in U.S. Pat. No. 5,669,110. Disposable restraints are made of relatively tough plastic to insure that a detainee cannot break free once restrained. One drawback associated with the use of such disposable restraints is the difficulty in removing the restraints. In the past, the restraints have been removed from a detainee by using a cutting tool such as a scissors, clippers, knife, or other implement having an exposed blade(s). However, the use of implements of this type presents the risk of injury to the detainee. The restraints are often tightly positioned about the wrist. When using a scissors, for example, one leg of the scissors is positioned between the wrist and the restraint and then the cutting action of the scissors is performed. When cutting the restraining device in this manner, there is a risk that the exposed scissor legs may cut the wrist of the detainee. This risk increases when the detainee is struggling. Accordingly, there is a need to provide a device for removing restraints that reduces the risk of injury to the detainee upon removal of the restraints. There is also a need to provide a cutting device that can quickly and efficiently be used to remove the restraints.
Most restraint cutters are simple applications of existing tools. They are not designed for the unique applications faced by public safety personnel. They are often misplaced in a correctional environment. Furthermore, knives, scissors and other open-bladed implements can be turned against an officer.
In addition, when using a scissors or clippers, these devices operate by cutting from one side of a restraint to the other. In practice, these devices can often slip off of the restraint prior to severance, and thus having the effect of sliding the restraint between the legs of the scissors as opposed to severing it. Thus there is a further need to provide a cutting device that reduces this problem of slippage that can often occur when using a traditional scissors or clippers to sever the restraint.
SUMMARY OF THE INVENTION
The subject invention is specifically directed to a compact, easily carried, and lightweight cutting device having a movable cutting blade and a pair of legs that are pivotally mounted to a head member of the cutting device and that are connected to the cutting blade. The cutting device is equipped with a shield which serves as a safety guard to cover the blade and protect a detainee from inadvertent injury upon removal of the restraints. The shield also serves to provide a cutting surface wherein the restraint is positioned between the cutting surface and the cutting blade. To sever the restraint, the legs of the cutting device are pulled together in a manner similar to actuating a pair of pliers. As the legs come together, the cutting blade moves into engagement with the restraint. The tip of the cutting blade pierces the restraint, and upon further forward movement, the cutting blade cuts through the restraint while entering a slit positioned within the cutting surface. In this manner, the cutting device uses compound leverage to facilitate severing the restraint. Unlike scissors or clippers, when the tip of the cutting blade engages the restraint, the restraint is pinned in place against the cutting surface of the shield. This eliminates the problem of slippage associated with using scissors or clippers.
The cutting device of the present invention provides a cutting device for severing disposable restraints having a shielded cutting blade located in a restricted area where fingers or other body parts cannot enter. The cutting device severs the restraint by initially piercing the restraint and thus eliminates the problem of slippage associated with using traditional scissors or clippers.
In a preferred embodiment, the cutting device further includes leg extensions having hooks that latch onto the opposing leg such that when the leg extensions are in the retracted position, the legs are locked in their closed position. When the leg extensions are pulled out into the extended position, the cutting device is in its unlocked, operable position, and the legs are freely movable into an unlocked open position.
This provides an added measure of safety that allows the cutting device to remain in a locked condition when not in use, and prevents the cutting device from being turned against an officer. The cutting device may also be provided with a keyring hole on the legs or leg extensions whereby the cutting device may be attached to one's keyring and easily accessible when needed.
In a preferred embodiment, the cutting blade has a triangular end culminating in a centrally located outer cutting tip. The cutting blade is disposed in a corresponding slit in the cutting device and preferably has two parallel sides. Two parallel stainless steel pins are preferably located directly adjacent to both sides of the cutting blade such that both sides of the cutting blade ride against the pins during movement of the cutting blade. The use of the parallel stainless steel pins prohibits the cutting blade from binding in the cutting blade slit during operation. Thus, they provide for reliable, smooth, and trouble-free operation.
BRIEF DESCRIPTION OF THE DRAWINGS
Further advantages of the present invention will become apparent to those skilled in the art with the benefit of the following detailed description of the preferred embodiments and upon reference to the accompanying drawings in which:
FIG. 1 is a perspective view of the cutting device of the present invention.
FIG. 2 is a front view of the cutting device.
FIG. 3 is a back view of the cutting device.
FIG. 4 is a side view of the cutting device.
FIG. 5 is a front view of the cutting device with the first and second leg extensions in the extended position and the legs in the closed position.
FIG. 6 is a front view of the cutting device with the first and second leg extensions in the extended position and the legs in the open position.
FIG. 7 is a cross-sectional view taken along line 7—7 of FIG. 4.
FIG. 8 is a cross-sectional view taken along line 8—8 of FIG. 7, and showing the cutting blade, connecting rivet, and guide pins.
FIG. 9 is a cross-sectional view taken along line 9—9 of FIG. 2, showing the legs locked in place.
FIG. 10 is a cross-sectional view taken along line 10—10 of FIG. 2 showing the latches of the leg extensions locked in place.
FIG. 11 is a cross-sectional view taken along line 11—11 of FIG. 2, showing the leg extensions housed within the legs.
FIG. 12 is a cross-sectional view taken along line 12—12 of FIG. 2, showing the cutting blade within the head member and shield.
FIG. 13 is a cross-sectional view taken along line 13—13 of FIG. 6, showing the cutting blade in a retracted condition within the head member, and showing a phantom view of a restraint within the cutting chamber.
FIG. 14 is a view of the cutting blade and guide pins.
FIG. 15 is a view of one of the many other types of cutting blades that could be used in the cutting device.
While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be specifically understood with respect to the drawings, that the drawings are of a preferred embodiment, and there are many other embodiments and forms in which the present invention may appear. It should also be understood that the drawings and detailed description thereof are not intended to limit the invention to the particular form disclosed, but on the contrary, the invention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the present invention or within the scope of the appended claims.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
A cutting device 10 made in accordance with the principles of the subject invention is depicted in FIGS. 1-15. As shown in FIG. 1, cutting device 10 preferably includes a first leg 12 and second leg 14, both pivotally mounted to head member 16. First and second legs 12 and 14 are preferably mounted using a circular hub on the leg that intersects and fits within a corresponding circular bore on the head member, or vice versa. Shield 18 is connected to head member 16 and is preferably integral therewith. Cutting blade 20 is positioned within head member 16 and in FIG. 1 extends through cutting chamber 21 to shield 18. Also shown are first leg extension 24 and second leg extension 26 as well as keying opening 28. As discussed below in describing FIGS. 12-13, connector 22 extends through a circular opening of the first leg 12 through a slot in head member 16, through cutting blade 20 through a circular opening of the second leg 14 to connect the first leg 12, cutting blade 20, and second leg 14.
In FIGS. 1-3, the legs 12 and 14 are in a closed, locked position with leg extensions 24 and 26 in a first retracted position. In this closed, locked position, cutting blade 20 is in an extended position and the outer cutting tip 30 is positioned within shield 18. In this closed, locked position, the legs 12 and 14 cannot be opened and keyring opening 28 can be used to easily attach the cutting device to one's person.
The ability to easily and reliably access the cutting device provided by the keyring opening is a benefit of the preferred embodiment, otherwise public safety officials may be required to resort to more dangerous and less efficient cutting implements such as knives or scissors.
In a preferred embodiment the head member 16, shield 18, legs 12 and 14, and leg extensions 24 and 26 are comprised of a durable, lightweight plastic material, and most preferably comprised of a glass-reinforced nylon material having the trade name Zytel and available from DuPont.
FIG. 4 shows cutting device 10 and illustrates how leg extension 24 slidably fits within leg 12. FIG. 5 shows cutting device 10 with leg extensions 24 and 26 in a second extended position. Leg extensions 24 and 26 are moved into the second extended position by grasping the keyring opening and pulling the leg extensions in a direction away from the cutting blade. With leg extensions 24 and 26 in the second extended position, the cutting device 10 is in a closed, operable position, where latches 42 and 44 are no longer in locking engagement with legs 12 or 14 and the legs may be pulled apart into an open position. Thus, the cutting device is operably movable from a closed, locked position as shown in FIGS. 1-3, to a closed, operable position shown in FIG. 5. In both the closed, locked position and the closed, operable position, the connector 22 is located at an upper point of slot 40 and cutting blade 20 is in an extended position within shield 18.
FIG. 6 shows legs 12 and 14 in an open position. As legs 12 and 14 are moved into the open position, connector 22 and cutting blade 20 move to a lower point of slot 40 and cutting blade 20 is in a retracted position within head member 16. In this open position, cutting chamber 21 is available to receive a restraint into the cutting chamber 21. In this open position of FIG. 6, public safety officials can position shield 18 between the wrist of a detainee and the restraint to position the restraint into cutting chamber 21. Shield 18 may include lip 50 to facilitate the insertion of the shield 18 between the restraint and wrist and to help retain the restraint within the cutting chamber once it has been inserted. Shield 18 and lip 50 are preferably in close proximity to the top of head member 16. Most preferably the distance between the shield 18 or lip 50 and the top of head member 16 is less than 0.25 inches. This prevents fingers, folds of skin or other body parts to enter the path of the cutting blade within the cutting chamber and further helps to prevent the risk of injury. Shield 18 should also have a sufficiently narrow width to allow the shield to be placed between the wrist of a detainee and the restraint and the lip 50 is preferably more narrow than the rest of the shield.
Once the restraint is within cutting chamber 21, the restraint may be severed by moving legs 12 and 14 back into the closed, operable position of FIG. 5. In moving the legs 12 and 14 together connector 22 moves from a lower point of slot 40 to an upper point of slot 40 and the cutting blade in turn engages the restraint.
In a preferred embodiment, the cutting blade 20 has an outer cutting point 30 that moves into cutting engagement with the restraint. In this manner the cutting blade 20 pins the restraint against a cutting surface 60 of shield 18. As cutting blade 20 moves toward shield 18, the outer cutting point 30 pierces the restraint. As shown in FIG. 15, the cutting blade 20 may include angled cutting surfaces 35 and 37. When using such a cutting blade, as the cutting blade moves forward into a slit in shield 18, the angled cutting surfaces 35 and 37 provide a cutting action in opposite directions from the point of piercing to cut the restraint in two directions. The cutting device of the present invention provides for compound leverage as a moment of force is supplied about both hubs where the legs 12 and 14 are pivotally connected to the head member 16 and in turn provide a stronger force to the connector and cutting blade in an axial direction along the slot 40 of head member 16. The use of compound leverage and a cutting blade that works to cut the restraint in two directions, serves to provide a relatively easy cutting action. In fact, very little squeezing force in bringing the legs together is required to effectuate the severing of the restraint. Thus, restraints can be quickly and efficiently removed with the cutting device of the present invention.
FIG. 15 shows an alternative cutting blade 70 having an angled cutting blade 72. When using a blade of this type, and positioned in the cutting device of FIG. 2 with side 76 located near enclosed portion 78 of cutting chamber 21, and side 74 located near the open end of cutting chamber 21, the blade serves to trap the restraint within the cutting chamber 21 and force the restraint against the enclosed portion 78. Using a blade of this type and in this manner eliminates the problem of slippage encountered when using traditional cutting implements such as scissors or knives. It will be appreciated by those of skill in the art that many other types of blades could be used in the cutting device and still gain from the benefits of the present invention.
FIG. 7 shows a cross-sectional view along line 7—7 of FIG. 4. This view shows guides 80 and 82 upon which leg extensions 22 and 24 are respectively aligned. These guides 80 and 82 provide for a smooth slidable engagement between the legs and the leg extensions. FIG. 7 also shows stops 84 and 86 against which leg extensions 24 and 26 abut when in the closed, locked position.
FIG. 7 also shows transverse slit 100 with head member 16 and corresponding slit 102 within shield 18. Cutting blade 20 is positioned in the transverse slit 100 within head member 16.
FIGS. 8 and 14 show pins 120 located on either side of cutting blade 20. Pins 120 serve as a guide for cutting blade 20 as it moves from a closed retracted condition to an extended condition. The use of the pins 120 prevent the cutting blade from binding against the sides of transverse slit 100 during operation and also prevent wear of the walls of the transverse slit 100. Pins 120 are preferably made of metal and most preferably are made of stainless steel. Cutting blade 20 is similarly preferably comprised of a high carbon stainless steel.
FIG. 9 shows a cross-sectional view along line 9—9 of FIG. 2 and shows legs 12 and 14 in a locked condition as latches 42 and 44 are locking the legs together.
FIG. 10 shows a cross-sectional view along line 10—10 of FIG. 2 and also shows the latches 42 and 44 in a locked condition.
FIG. 11 is a cross-sectional view along line 11—11 of FIG. 11 showing leg extensions 24 and 26 slidably engaged with legs 12 and 14.
FIG. 12 shows a cross-sectional view along line 12—12 of FIG. 2 and
FIG. 13 shows a cross-sectional view along line 13—13 of FIG. 6. FIG. 12 shows the connector 22 comprised of first rivet section 130 and second rivet section 132 wherein the first rivet section 130 includes an extension 134 which extends through a hole in cutting blade 20. In this manner the connector 22 pins the cutting blade between the first and second rivet sections 130 and 132, and cutting blade 20 is positioned within head member 16. FIG. 13 depicts a similar view, except that in FIG. 12 the cutting device is in the closed, locked position and in FIG. 13 the cutting device is in the open position and able to receive a restraint (shown in phantom lines) within cutting chamber 21. In a preferred embodiment connector 22 is a stainless steel rivet, although the connector could take many forms including a screw, bolt, pin, or other connective device known to those of skill in the art.
As shown in FIG. 1, an upper end 136, 138 of each leg 12 and 14 is bifurcated for receiving a reduced in thickness plate portion 140 of the head member 16 in a slot 142 in leg 12 and in a slot 144 in leg 24. The plate portion 140 is thinner than the thicker shield portion 18 of the head member 16. Further, the bifurcated upper end 136 of the leg 12 is pivotally connected to the head member on one side of the head member and the bifurcated upper end 138 of the leg 14 is pivotally connected to the other side of the head member 16
It will be seen in FIG. 8, that the connector 22 includes the rivet section 130 comprising a pin that is received in and moves in the slot 40 and, since the pin extends through the blade 20, the blade 20 moves with the pin as the pin moves in the slot 40 and the blade 20 slides in the transverse slit 100 in the plate portion 140 of the head member 16.
Pivotal movement of the legs 12 and 14 on the head member 16 causes movement of the pin of the rivet section 130 in the slot 40 resulting in sliding movement of the blade 20 in the slit 100.
While certain features and embodiments of the invention have been described wherein, it will be readily understood that the invention encompasses all modifications and enhancements within the scope and spirit of the present invention.
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