JP7280131B2 - Gut clamp mechanism - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a string clamping mechanism for a string tensioning device such as a tennis racket.

As shown in FIGS. 26 and 27, a racket tensioning device for a tennis or badminton racket comprises racket fixing bases 100, 100, string clamping mechanisms 101, 101, and a tension unit 102 for pulling strings with a predetermined pressure. It will be.

A gut clamping mechanism 101 in the device includes a clamp base 101A which can be freely moved and adjusted in the left-right direction along a guide rail 103, a support post 101B erected on the clamp base 101A, and one side 101C' which supports the clamp base 101A. A pair of clamping bodies 101C fixed to the upper end of the post 101B and provided with the other side 101C'' so as to be freely contactable and separable from the one side 101C', with a compression coil spring (not shown) interposed therebetween. a pressing plate 101F having a shaft rod 101D which is inserted in a state in which the holding member 101C is aligned, and a tightening adjusting nut 101E screwed to a screw portion carved at the tip of the shaft rod 101D; and the pressing plate 101F. The support post 101B has a cylindrical body 101B' fixed to the clamp base 101A and one side 101C' of a pair of clamping bodies 101C. A cylindrical body 101B'' is slidably inserted into the cylindrical body 101B'. Further, 101H is a tightening adjustment screw provided on the clamp table 101A and between the clamp table 101A and the rail 103, and 101I is a lever for fixing the clamp table 101A to the rail.

When clamping the gut, the clamp handle 101G is pushed down. As a result, the pressing plate 101F tilts outward at its lower end and inward at its upper end to press the clamping member 101C'' on one side, thereby clamping the string between the pair of clamping members 101C.

Therefore, such a conventional gut clamp mechanism has the following problems. The first problem is that the clamp base fixing lever 101I returns by some momentum. That is, when the clamp base 101A is fixed at a predetermined position and angle on the rail 103 by turning the clamp base fixing lever 101I in the tightening direction, the operator may hit the hand or the string may get tangled. For example, if a shock is applied due to some momentum, the clamp table fixing lever 101I will return to the tightening release direction without permission. In this case, everything that has been stretched up to that point will be loosened, resulting in wasted labor and time.

In addition, the string clamping operation is performed by first pressing down the clamp handle 101G to clamp the string between the pair of clamping members 101C, and then turning the clamp table fixing lever 101I in the tightening direction to fix it at a predetermined position on the rail 103. Then, the clamp handle 101G is lifted again to release the clamping by the pair of clamping members 101C, and finally the clamp base fixing lever 101I is pushed back in the tightening releasing direction. However, since at least four work steps are required, work efficiency is poor. This is the second problem.

Therefore, the present inventor previously devised a gut clamp mechanism (Japanese Patent Application Laid-Open No. 2003-334264) shown in FIGS. 1 to 25 in order to solve such problems.

The gut clamp mechanism previously devised by the inventors of the present invention will be described below.

1 is a perspective view of the first embodiment, FIG. 2 is a front view of the same, FIG. 3 is a right side view of the support post with the cylindrical body removed from the cylindrical body, and FIG. 4 is a cut part of the support post. 5 is a cross-sectional view taken along the line AA in FIG. 4; FIG. 6 is a front view of the clamp base fixing lever; FIG. 7 is a left side view of the same; FIG. 10 is a right side view of the same, FIG. 11 is a plan view of the same, FIG. 12 is a front view of the frame-like pressing body, FIG. 13 is a plan view of the same, FIG. 15 is a bottom view of the same, FIG. 16 is a perspective view of the pressing actuator, FIG. 17 is a front view of the holding body, FIG. 18 is a plan view of the same, FIG. 19 is a plan view of the free state, and FIG. 21 is a plan view of the fixed state, FIG. 22 is a perspective view of the fixed state, FIG. 23 is a side view showing a cross section of the main part of the second embodiment, and FIG. 24 is a perspective view of the same locked state. 25 is a perspective view of the unlocked state.

First, a first embodiment shown in FIGS. 1 to 22 will be described.
In the figure, 1 is a rail having a groove 1a in the center. 2 is a clamp base. The details of the clamp table 2 will be described later. A support post 3 is erected on the clamp base 2 . Further, the support post 3 has a cylindrical body 3a fixed to the clamp table 2, and a cylindrical body 3b which is slidably inserted is fixed to one side of a pair of holding members described later, unlike the support post in the conventional product. are doing.

Reference numeral 4 denotes a pair of clamping bodies, one side 4a of which is fixed to the upper end of the cylindrical body 3b of the support post 3, and the other side 4b of which is attached to and separated from the one side 4a. not shown).

Denoted at 5 is a pressing plate having a shaft rod 5a inserted through the pair of clamping members 4 together, and having a tightening nut 6 screwed onto a screw portion carved at the tip of the shaft rod 5a. A clamp handle 7 is pivotally attached to one end of the pressing plate 5 .

The gut clamp mechanism previously devised by the inventor of the present invention is constructed with the above members in the same manner as in the prior art. Further, the clamp base 2 is composed of the following members.

Reference numeral 8 denotes a main body of the clamp base 2, which has a flat boat shape and has a cylindrical body 3a of the support post 3 standing on one tapered end side. Further, a lock pin 9 is provided so as to be retractable at a position behind the support post 3 and at a position where the lower end of the cylindrical body 3b comes into contact with the support post 3 when the cylindrical body 3b falls, and the lock pin 9 is provided with an expansion coil spring. With 10, it is energized so that the upper end always protrudes.

Further, the main body portion 8 has a concave portion 11 for accommodating a frame-like pressing body movably in the front-rear direction, and a fitting hole provided substantially in the center for fitting the braking body slidably in the vertical direction. 12, and a camshaft support hole 13 provided between the fitting hole 12 of the braking body and the lock pin 9. As shown in FIG. Further, the tapered slope of the fitting hole 12 of the braking body at the position opposite to the lock pin 9 communicates with the concave portion 11 that accommodates the frame-shaped pressing body, so that the pressing body described later can be moved forward and backward. A fitting hole 14 is provided for fitting so as to be movably directional. Reference numeral 8' designates an insertion hole for a tightening adjusting screw provided at the rear end of the main body 8, and 8a designates an upper cover of the main body 8. As shown in FIG.

Reference numeral 15 denotes a frame-like pressing body which is accommodated in the concave portion 11 of the main body portion 8 so as to be movable in the front-rear direction. The frame-like pressing body 15 has a boat-like planar shape similar to that of the main body 8, and a tightening adjustment screw 16 is screwed in the center of the rear portion so as to advance and retreat in the front-rear direction.

Reference numeral 17 denotes a braking body fitted into the fitting hole 12 of the braking body of the main body 8 so as to be slidable in the vertical direction. The braking body 17 is composed of an inverted truncated conical portion 17a and a plate-like portion 17b having substantially the same width as the groove 1a of the rail 1, which is integrally connected to the lower portion of the inverted truncated cone-like portion 17a. The portion 17b is provided with threaded holes 18, 18 into which connecting screws 19, 19 are screwed on its lower surface.

Reference numeral 20 denotes a clamping body which is integrally connected with the braking body 17 by means of the connecting screws 19, 19. As shown in FIG. The clamping body 20 includes a plate-like portion 20a having the same width as the plate-like portion 17b of the braking body 17, and a plate-like portion 20a having a width larger than that of the plate-like portion 2a. The plate-like portion 20b is provided with screw holes 21, 21 into which the connecting screws 19, 19 are screwed.

Denoted at 22 is a pressing actuator fitted in the fitting hole 14 of the main body 8 so as to be movable in the longitudinal direction.

A cam shaft 23 is rotatably fitted in the cam shaft support hole 13 of the main body 8, and an eccentric cam 24 is integrally formed in the central portion in the axial direction.

Reference numeral 25 denotes a clamp base fixing lever fixed to the protruding portion of the cam shaft 23 from the main body portion 8 . The clamp table fixing lever 25 has a semi-circular notch 26 in which the upper end of the lock pin 9 fits about half in the front portion of the lower surface of the disk-shaped base portion 25a. An arc-shaped groove 29 having a predetermined length is provided outside the insertion hole 27 so that a stopper pin 28 provided on the upper surface of the main body 8 is slidably fitted. Reference numeral 30 denotes an insertion hole for a connecting pin.

Reference numerals 31 and 31 denote expansion coil springs provided between the body portion 8 and the inner surface of the frame-shaped pressing body 15 on the rear side thereof, and urge the frame-shaped pressing body 15 to always retreat. . Reference numeral 32 denotes an expansion coil spring provided between the outer surface of the frame-shaped pressing body 15 and the knob portion 16a of the tightening adjustment screw 16 for preventing loosening.

Next, the operation of the first embodiment will be described.
As shown in FIG. 19, when the clamp table fixing lever 25 is turned in the arrow direction, the cam shaft 23 is rotated and the eccentric cam 24 is also shifted forward. Accordingly, the inner surface of the front end side of the frame-shaped pressing body 15 is pushed forward, and moves forward against the action of the expansion coil springs 31 , 31 .

Further, along with this, the front end of the tightening adjustment screw 16 screwed into the frame-shaped pressing body 15 pushes the pressing actuator 22 forward, and the front end surface thereof is strongly pressed against the inverted truncated conical portion 17a of the braking body 17. As shown in FIG. As a result, the body portion 8 is prevented from rotating in the horizontal direction with respect to the braking body 17 . At the same time, the braking body 17 acts to be pushed upward from obliquely downward by the pressing actuator 22, whereby the clamping body 20 integrated with the connecting screws 19, 19 is pulled up, and the lower surface of the body part 8 and the lower surface of the body part 8 are pulled up. , and the plate-like portion 20b of the holding member 20, thereby fixing the main body portion 8 at a predetermined position on the rail 1. As shown in FIG.

In this state, as shown in FIGS. 21 and 22, the lock pin 9 provided on the body portion 8 rises into the semicircular notch 26 provided on the base portion 25a of the clamp table fixing lever 25. and get stuck. Therefore, this state is firmly maintained, and even if some kind of shock is applied, the clamp table fixing lever 25 will not return to the original tightening releasing direction.

Further, when the clamping handle 7 is lifted to release the clamping by the pair of clamping bodies 4, the cylindrical body 3b of the support post 3 falls by loosening the force of the hand, and the lower end of the cylindrical body 3b is pushed by the lock pin 9 due to the impact. momentarily push in. As a result, the lock pin 9 is disengaged from the semi-circular notch 26 provided in the base portion 25a of the clamp table fixing lever 25, thereby releasing the lock and automatically returning the clamp table fixing lever 25 to the original tightening releasing direction. is.

Next, a second embodiment shown in FIGS. 23 to 25 will be described.
This embodiment is obtained by adding the following configuration to the first embodiment. In this additional configuration, a lock release operation pin whose lower end contacts the upper end of the lock pin 9 is located at the position of the semicircular notch 26 in the front portion of the disk-shaped base portion 25a of the clamp base fixing lever 25. 33 is vertically movably penetrated. 34 is a C-ring for retaining. In the drawings, the same reference numerals are assigned to the same members as in the first embodiment, and detailed description thereof will be omitted.

Therefore, in the case of the present embodiment, in addition to the effects of the first embodiment, it is possible to unlock by pushing down the unlocking operation pin 33 to push in the lock pin 9, thereby unlocking. .

Since the gut clamp mechanism previously devised by the present inventor has the above configuration and operation, once the clamp table fixing lever is turned in the tightening direction, even if some shock is applied, the original tightening can be easily performed. It does not return to the releasing direction. In addition, in the case of the structure of the first embodiment, when the clamp handle is lifted to release the clamping by the pair of clamping members, the clamp base fixing lever automatically returns to the tightening release direction, thereby improving work efficiency. can be improved.

Further, in the case of the structure of the second embodiment, in addition to the functions and effects of the structure of the first embodiment, it is possible to unlock by pushing down the unlocking operation pin and pushing in the lock pin. Yes, it is more convenient to use.

Accordingly, the present invention relates to an improvement of the second embodiment of the gut clamp mechanism previously devised by the inventor.

That is, in the second embodiment, it is possible to unlock by pushing down the unlocking operation pin and then pushing in the lock pin, which makes it easier to use than in the first embodiment. Depressing the lock pin by depressing the release pin is a very heavy burden on the operator.

Since the unlocking operation pin is located near the support post of the disk-shaped base of the clamp table fixing lever, it is difficult to push it down with a fingertip. It is fitted in a semicircular notch provided in the disk-shaped base of the clamp table fixing lever. , the contact surface with the lock pin is in strong contact with the lock pin, and as a result, strong frictional resistance occurs when the lock pin is pushed down. For this reason, a considerable force is required to push down, and a considerable burden is applied to the operator's fingers. Moreover, since this operation must be repeated many times throughout the day, it imposes a heavy labor burden on the operator.

Therefore, the present invention has been made to solve the above problems, and is provided with a pressurizing mechanism that utilizes the principle of a lever, and by using the pressurizing mechanism to press down the unlocking operation pin, the lock release operation pin can be pressed with less force. To provide a gut clamping mechanism which does not require a clamping mechanism, and which facilitates the pressurizing operation by enlarging the pressurizing operation area.

Therefore, the gist of the present invention is
It comprises a rail, a clamp base, a support post erected on the clamp base, a pair of clamping bodies for clamping guts provided at the upper ends of the support posts, and a clamp handle for opening and closing the clamp base. is housed in a plane boat-shaped main body and movably forward and backward in the main body, and is always urged to retreat by an expansion coil spring provided between the main body and the front end of the rear end. An inverted truncated conical body fitted into a fitting hole provided in the center of the main body so as to be vertically slidable. and a plate-like portion having substantially the same width as the groove of the rail integrally connected to the lower part of the braking body, and the same width as the plate-like part of the braking body connected to the lower part of the braking body. and a plate-like portion wider than the plate-like portion integrally connected to the lower portion of the clamping body, and a tapered shape in the fitting hole of the braking body provided in the body portion a pressing actuator having a front end surface adapted to the tapered shape of the inverted frustoconical portion of the braking body, which is fitted in a fitting hole provided in the slope of the pressing member so as to be movable in the front-rear direction and contacts the inverse frustoconical portion of the braking body; a cam shaft integrally formed with an eccentric cam at its axial center portion, which is rotatably supported in a cam shaft support cylinder provided in front of the fitting hole of the braking body of the main body; and the main body of the cam shaft A string clamping mechanism in a string tensioning device for a tennis racket or the like, comprising a clamp base fixing lever having a disc-shaped base fixed to the upper end projecting from the upper end of the string, in which a cylindrical body is slidably inserted. a support post comprising a cylindrical body, the cylindrical body being fixed to the clamp base and the cylindrical body being fixed to one side of the pair of clamping bodies; A lock pin is provided so as to be retractable at a position where the lower end contacts when the body falls, and the upper end is always urged to protrude via an expansion coil spring. A semicircular notch into which the upper end of the lock pin fits about halfway is provided in the front part of the lower surface, and a stopper pin provided on the upper surface of the main body part is provided outside the cam shaft insertion hole in the center part. An arc-shaped groove of a predetermined length is provided to be slidably fitted, and the lower end contacts the upper end of the lock pin at the position of the semi-circular notch in the front part of the disk-shaped base of the clamp base fixing lever. In a string clamping mechanism in a string tensioning device such as a tennis racket, in which a lock release operation pin is vertically movably penetrated, the position on the front side of the lock pin at the end of the clamp base on the side of the support post a pair of support rods erected so as to sandwich the support post; and an unlocking operation pin whose front end is pivotally attached to the pair of support rods and whose rear end is in contact with the lower surface thereof. A pressurizing plate that extends to a length that can obtain an appropriate pressurizing force and rotates vertically with the pivot as a fulcrum, and a disk consisting of the pressurizing plate and the clamp base fixing lever. A string clamping mechanism in a string tensioning device for a tennis racket or the like, characterized by comprising a pressure mechanism comprising an expansion coil spring for returning a pressure plate to its original position, which is contracted between the base and the base of the shape.

In the above configuration, it is preferable that the pressure plate has a rectangular planar shape, or a fan-shaped planar shape and integrally formed walls on the front and side portions.

The present invention is configured as described above and includes a pressurizing mechanism utilizing the principle of a lever. The pressurizing plate rotates in the vertical direction with the pivoting portion as the fulcrum of rotation. and the distance to the end extending rearward from the point of action, i.e., the point of force, the latter being considerably larger than the former. When the unlocking operation pin is pressurized, it can be performed without requiring much force, and by increasing the pressurizing operation area, it is possible to perform the unlocking operation like the mechanism devised earlier by the present inventor. The lock can be released by pressing not only one point of the pin head, but also any part on the rear side of the point of action of the pressure plate, thereby greatly reducing labor for the operator. .

1 is a perspective view of a first embodiment of a clamping mechanism previously devised by the inventor; FIG. It is the same front view. It is a right view in the state which removed the cylindrical body in the same support post from a cylindrical body. It is a top view in the state which cut|disconnected the same support post in the middle and removed the upper cover. 5 is a cross-sectional view taken along the line AA in FIG. 4; FIG. It is a front view of a clamp base fixing lever. It is a left side view of a clamp base fixing lever. It is a bottom view of a clamp base fixing lever. It is a front view of a camshaft. It is a right side view of a camshaft. 4 is a plan view of a camshaft; FIG. FIG. 4 is a front view of a frame-shaped pressing body; FIG. 4 is a plan view of a frame-shaped pressing body; It is a front view of a braking body. It is a bottom view of a damping|braking body. FIG. 3 is a perspective view of a pressing actuator; It is a front view of a holding body. It is a top view of a holding body. 1 is a plan view of a free state of a first embodiment of a gut clamp mechanism previously devised by the inventor; FIG. 1 is a perspective view of a free state of a first embodiment of a gut clamp mechanism previously devised by the inventor; FIG. 1 is a plan view of a first embodiment of a gut clamp mechanism previously devised by the present inventor in a fixed state; FIG. 1 is a perspective view of a first embodiment of a gut clamp mechanism previously devised by the present inventor in a fixed state; FIG. FIG. 10 is a side view showing a cross section of a main part of a second embodiment of the gut clamp mechanism previously devised by the present inventor; It is a perspective view in the same locked state. It is a perspective view in the unlocked state. It is explanatory drawing of the string tension|stretching apparatus, such as the conventional tennis racket. It is explanatory drawing of the conventional gut clamp mechanism. FIG. 4 is a plan view of the gut clamp mechanism according to the first embodiment of the present invention, with the support post cut halfway and the upper lid removed; FIG. 29 is a cross-sectional view taken along the line BB in FIG. 28; It is the perspective view which abbreviate|omitted the same support post, and shows the state before locking. It is the front view which abbreviate|omitted the same support post, and shows the state before pressurization by a pressure plate. It is the front view which abbreviate|omitted the support post and showed the state pressurized by the pressure plate. 4 is a plan view of a pressure plate; FIG. 34 is a cross-sectional view taken along the line CC in FIG. 33; FIG. FIG. 10 is a perspective view of a gut clamp mechanism according to a second embodiment of the present invention, omitting support posts, showing a state before locking; It is the same front view. 4 is a plan view of a pressure plate; FIG. FIG. 38 is a sectional view along line DD in FIG. 37; FIG. 38 is a cross-sectional view taken along line EE in FIG. 37; It is a bottom view of a pressure plate.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, a first embodiment of the present invention shown in FIGS. 28 to 34 will be described.

This embodiment is an improvement of the second embodiment shown in FIGS. Since the configuration is the same as that of the second embodiment, the same reference numerals are given to the same members, and detailed description thereof will be omitted.

Thus, in this embodiment, a pair of support rods 35 erected so as to sandwich the support post 3 are provided at the end of the clamp base 2 on the support post 3 side and at a position forward of the lock pin 9. 35, the front end portion 36a is pivotally attached 35a to the pair of support rods 35, 35, while the rear end portion 36b is placed at a position 36A of the unlocking operation pin with which the lower surface contacts. A pressure plate 36 that extends to a length sufficient to obtain pressure and rotates vertically with the pivotal portion 35a serving as a fulcrum of rotation, and a disc-like structure of the pressure plate 36 and the clamp base fixing lever 25. It is characterized by comprising a pressurizing mechanism 38 comprising an expanding coil spring 37 for returning the pressurizing plate 36 to the original position, which is compressed between the base 25a.

In the present embodiment, the pressure plate 36 has a rectangular planar shape, and the expansion coil spring 37 for returning the pressure plate 36 to its original position is located at the center of the pressure plate 36 in the longitudinal direction. The recess 36 ′ provided on the lower surface and the recess 25 ′ provided in the center of the upper surface of the disk-shaped base portion 25 a of the clamp table fixing lever 25 are compressed.

Next, the operation of this embodiment will be described.
This embodiment has a pressure mechanism 38 that utilizes the principle of the lever, and the pressure plate 36 in the pressure mechanism 38 is attached to a pair of support rods 35, 35 erected on the clamp table 2 in front thereof. The side end portion 36a is pivoted 35a, 35a, and the pressure plate 36 rotates vertically using the pivoted portions 35a, 35a as pivot points. contact position 36A, that is, the distance from the point of action to the pivot portions 35a, 35a to the pair of support rods 35, 35 serving as fulcrums, and the end portion 36b extending rearward from the point of action, that is, the point of force Since the latter distance is considerably larger than the former, it is possible to push down the unlocking operation pin 33 with the pressure plate 36 without much force. By increasing the pressurizing operation area, it is possible to press not only one point on the head of the unlocking operation pin 33 as in the mechanism previously devised by the present inventor, but any part behind the point of action of the pressurizing plate 36 . The lock can also be released by pressing , thereby greatly reducing the labor of the operator.

Next, a second embodiment of the invention shown in FIGS. 35 to 40 will be described.

This embodiment differs from the first embodiment in the form of the pressure plate 36 . That is, the pressure plate 36 in the first embodiment has a rectangular planar shape, whereas the pressure plate 36 in the present embodiment has a fan-shaped planar shape and has walls at the front and side portions. It is formed by integrally molding the body 36''. Since other constructions and functions are the same as those of the first embodiment, the same members are denoted by the same reference numerals, and detailed description thereof will be omitted. .

REFERENCE SIGNS LIST 1 rail 2 clamp base 3 support post 3a cylindrical body 3b at support post cylindrical body 4 at support post pair of clamping bodies 7 clamp handle 8 body portion of clamp base 9 lock pin 15 frame-like pressing body 16 tightening adjusting screw 17 braking body 17a Inverted truncated conical portion 17b of braking body Plate-shaped portion 20 of braking body Clamping body 20a Plate-shaped portion 20b of clamping body Plate-shaped portion 22 of clamping body Pressing actuator 23 Cam shaft 24 Eccentric cam 25 Clamp base fixing lever 26 Semicircle notch 27 cam shaft insertion hole 28 stopper pin 29 arc-shaped grooves 31, 31 expansion coil spring 33 lock release operation pin 34 C-rings 35, 35 for preventing slippage pair of support rods 35a, 35a pivot portion 36 pressure plate 37 Expansion coil spring 38 Pressure mechanism

Claims (2)

A clamp base movable along the rail,
a support post erected on the clamp table;
a pair of clamping bodies for clamping the gut provided at the upper end of the support post;
A string clamp mechanism comprising a string tensioning device for a tennis racket or the like, comprising a clamp handle for opening and closing the pair of clamping bodies,
The support post comprises a cylindrical body and a cylindrical body into which it is slidably inserted,
The clamp base is
a main body on which the cylindrical body of the support post is erected on a front end side;
a clamp base fixing lever for fixing the main body to the rail;
a lock pin provided so as to be retractable at a position where the lower end of the dropped cylindrical body contacts;
a coil spring that biases the lock pin so that the upper end of the lock pin always protrudes;
a notch that is provided on the lower surface of the clamp base fixing lever and locks the clamp base fixing lever by fitting the upper end of the lock pin;
an unlocking operation pin vertically movably penetrating through the position of the notch in the clamp base fixing lever, the lower end contacting the upper end of the lock pin;
a pressurizing mechanism that pressurizes and presses the unlocking operation pin,
The clamp table fixing lever is unlocked by the lock pin being pushed down and removed from the notch by the contact of the dropped cylindrical body with the lock pin and the pressing of the lock release operation pin,
The pressure mechanism is
a pair of support rods erected on the front end side of the main body;
The unlocking operation pin is pivotally attached to the pair of support rods so as to rotate vertically with the front end as a pivot point, and the unlocking operation pin is set to a length such that an appropriate pressure can be applied to the unlocking operation pin. A pressure plate extending rearward from the position where the bottom surface contacts;
An expansion coil spring contracted between the pressure plate and the clamp table fixing lever,
A gut clamp mechanism , wherein the pressure plate has a fan-like planar shape, and is formed by integrally forming walls on a front portion and a side portion . 2. The gut clamp mechanism according to claim 1, wherein said pressure plate has a rectangular planar shape.

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