CN215273134U - Quick-mounting type labor-saving laparoscopic surgery forceps instrument handle - Google Patents

Abstract

The utility model discloses a ready-package laborsaving laparoscopic surgery pincers class apparatus handle, including the apparatus handle, the apparatus handle includes handle seat, fixed handle, activity handle, is equipped with the slider in handle seat, the upper end of activity handle from the activity groove insert in the portion of inserting and with slider swing joint, be equipped with the pull rod in handle seat, the one end and the slider swing joint of pull rod, one that the slider is relative with the pull rod is served and is equipped with the pull rod patchhole, is equipped with the quick detach mechanism of fixing the pull rod in the slider on the slider. Compared with the prior art, the force application and the operation fatigue of an operator can be reduced, and the force is saved by three times of the prior art; carry out the high-speed joint through flashboard counter pull rod and the slider that sets up in the slider, realized the convenience to the dismouting between the pull rod of pincers type apparatus and the handle to and be convenient for to the washing and the disinfection of the pull rod part of pincers type apparatus, improve the effect of washing and disinfecting.

Description

Quick-mounting type labor-saving laparoscopic surgery forceps instrument handle

Technical Field

The utility model relates to a medical appliance, in particular to a quick-mounting type labor-saving laparoscopic surgery forceps appliance handle.

Background

In recent 20 years, with the progress of science and technology, laparoscopic surgery has been widely accepted by doctors and patients, and the safety, effectiveness and minimally invasive nature of laparoscopic surgery have been gradually recognized and the application range has become wider and wider. At present, the handles of surgical instruments such as various forceps and scissors which are most commonly used in a laparoscope are convenient to operate, but can not save labor during use to the maximum extent, and when acting force is applied, the hand feeling of the surgical instruments is not good, so that an operator is easy to fatigue hands or clamp the surgical instruments, and the operation time is influenced; meanwhile, the disassembly is troublesome, so that the cleaning and the disinfection cannot be well performed.

Disclosure of Invention

An object of the utility model is to provide a ready-package laborsaving laparoscopic surgery pincers class apparatus handle, the technical problem that solve reduce hand fatigue degree and easy dismounting, improve the effect of washing and disinfection simultaneously.

In order to solve the above problem, the utility model discloses a following technical scheme realizes: a quick-mounting type labor-saving laparoscopic surgery forceps instrument handle comprises an instrument handle body, wherein the instrument handle body comprises a handle seat, a fixed handle fixed on the handle seat and a movable handle hinged on the handle seat, the fixed handle and the handle seat are of an integral structure, the handle seat is hollow, a sliding block is arranged in the handle seat, one end, opposite to the movable handle, of the handle seat extends to the upper side of the movable handle to form an insertion part, the sliding block can move back and forth in the insertion part, a movable groove is formed in one end, opposite to the movable handle, of the insertion part, the upper end of the movable handle is inserted into the insertion part from the movable groove and is movably connected with the sliding block so as to pull the sliding block to move linearly towards the movable handle when the movable handle moves towards the direction of the fixed handle, a pull rod is arranged in the handle seat, one end of the pull rod is movably connected with the sliding block, and a slide rod is arranged at one end, far away from the handle seat, of the fixed handle, the sliding rod is hinged with the fixed handle, one end of the movable handle, which is far away from the insertion part, is provided with a connecting rod, and two ends of the connecting rod are respectively hinged with the sliding rod and the movable handle; one end of the sliding rod, which is far away from the fixed handle, extends to the outside of one side of the movable handle, which is far away from the fixed handle, in the direction of the movable handle, and a ring is arranged on the part of the rod body, which extends to the outside of one side of the movable handle, which is far away from the fixed handle; a pull rod inserting hole is arranged at one end of the sliding block opposite to the pull rod, a quick-release mechanism for fixing the pull rod in the sliding block is arranged on the sliding block, the quick-release mechanism comprises a flashboard, a push rod and a spring, the push rod and the spring are arranged on the flashboard, a sliding chute which is communicated with the inside of the handle seat and is opposite to the pull rod inserting hole is arranged on the handle seat, an extending part which extends out of the handle seat from the sliding chute is arranged on the sliding block, the extending part is provided with an inner cavity, a first extending part through hole which is communicated with the pull rod inserting hole is arranged at one end of the extending part which is positioned on the sliding block, a second extending part through hole which is communicated with the inner cavity of the extending part is arranged at one end of the extending part which is far away from the sliding block, a flashboard inserting groove which is used for the flashboard to move linearly towards the extending part direction is arranged on the sliding block, the flashboard inserting groove is opposite to the first extending part through hole, the flashboard inserting groove is arranged in the flashboard inserting groove, the push rod penetrates through the inner cavity of the extending part from the second extending part, the spring is arranged in the inner cavity of the extending portion and sleeved on the push rod, a gate plate hole is formed in the gate plate, and under a natural state, the gate plate hole and the pull rod inserting hole are staggered, so that the lower end hole wall of the gate plate hole is inserted into the clamping groove in the pull rod, the pull rod and the sliding block are fixed, when the push rod is pressed down, the gate plate hole and the pull rod inserting hole are overlapped, and the pull rod is taken out.

Furthermore, a movable handle slot for inserting the upper end of the movable handle is arranged on the sliding block, and the upper end of the movable handle is inserted into the movable handle slot.

Further, the one end of keeping away from the push rod in the flashboard hole is equipped with the symmetry and sets up and convex spacing portion, is equipped with the interval between two spacing portions to form the joint hole on the flashboard hole, pass the hole, under the normality, the joint hole is relative with the pull rod patchhole, when pressing the push rod, passes the hole and coincides with the pull rod patchhole.

Furthermore, a push rod cap movably connected with the push rod is arranged at the end, extending out of the extending part, of the push rod, the diameter of the through hole of the second extending part is larger than the outer diameter of the spring, and the spring extends out of the through hole of the second extending part and is propped against the push rod cap, so that a movable distance is reserved between the push rod cap and the extending part.

Furthermore, a slide bar through groove for the slide bar to pass through is formed in the movable handle, so that the slide bar can slide in the slide bar through groove.

Further, the length of the connecting rod is one half of the length of the sliding rod.

Compared with the prior art, the utility model, through setting up the hollow handle seat, set up the slide block in the handle seat in order to connect pull rod and activity handle, when exerting external force to the activity handle, the pull rod is pulled by the slide block in parallel, can reduce operator's hard size and operation fatigue degree like this, the strength of saving is three times of the prior art; carry out the high-speed joint through flashboard counter pull rod and the slider that sets up in the slider, realized the convenience to the dismouting between the pull rod of pincers type apparatus and the handle to and be convenient for to the washing and the disinfection of the pull rod part of pincers type apparatus, improve the effect of washing and disinfecting.

Drawings

Fig. 1 is a schematic view of the external structure of the present invention.

Fig. 2 is a cross-sectional view of the present invention.

Fig. 3 is a schematic structural diagram between the slide block and the shutter of the present invention.

Fig. 4 is a schematic structural diagram of the press-down gate of the present invention.

Fig. 5 is a schematic view of the usage state of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1 and 2, the utility model discloses a ready-package laborsaving laparoscopic surgery pincers class apparatus handle, including apparatus handle 1, apparatus handle 1 includes handle seat 2, fixes fixed handle 3 on handle seat 2 and articulates movable handle 4 on handle seat 2, fixed handle 3 and handle seat 2 structure as an organic whole, form a whole, movable handle 4 locates the rear end of fixed handle 3, the front end of handle seat 2 is equipped with parts such as the sleeve pipe of peritoneoscope, under the general condition, sleeve pipe swing joint is on handle seat 2, the sleeve pipe can be followed sheathed tube circumferential direction (this part is prior art, specific unnecessary repeated description here), be equipped with the external screw thread that can supply bushing on handle seat 2, wherein:

the handle seat 2 is hollow, a sliding block 5 is arranged in the handle seat 2, and the shape of the sliding block 5 is matched with the interior of the handle seat 2; one end of the handle seat 2 opposite to the movable handle 4 extends to the upper part of the movable handle 4 to form an insertion part 6, and the slide block 5 is arranged in the insertion part 6; a movable groove 61 is arranged at one end of the insertion part 6 opposite to the movable handle 4, the upper end of the movable handle 4 is inserted into the insertion part 6 from the movable groove 61 and is movably connected with the sliding block 5, so that when the movable handle 4 moves towards the fixed handle 3, the sliding block 5 is pulled to move linearly towards the movable handle 4 into the insertion part 6, and the sliding block 5 moves linearly back and forth in the insertion part 6;

a pull rod 7 is arranged in the handle seat 2, one end of the pull rod 7 is movably connected with the sliding block 5, the other end of the pull rod 7 extends out of the handle seat 2 from one end far away from the fixed handle 3, when the sliding block 5 moves linearly back and forth in the insertion part 6, the pull rod 7 is driven to translate, a slide rod 8 is arranged at one end of the fixed handle 3 far away from the handle seat 2, the slide rod 8 is hinged with one end of the fixed handle 3 far away from the handle seat 2, a connecting rod 9 is arranged at one end of the movable handle 4 far away from the insertion part 6, and two ends of the connecting rod 9 are respectively hinged with the slide rod 8 and the movable handle 4; one end of the sliding rod 8, which is far away from the fixed handle 3, extends to the outside of one side of the movable handle 4, which is far away from the fixed handle 3, towards the direction of the movable handle 4, and a finger ring 12 is arranged on the part of the rod body, of the sliding rod 8, which extends to the outside of one side of the movable handle 4, which is far away from the fixed handle 3;

a pull rod inserting hole 52 is formed in one end, opposite to the pull rod 7, of the sliding block 5, and a quick-release mechanism for fixing the pull rod 7 in the sliding block 5 is arranged on the sliding block 5, so that the pull rod 7 can be quickly disassembled and assembled, and the disinfection is facilitated.

As shown in fig. 2, 3 and 4, in the present invention, the quick release mechanism includes a shutter 10, a push rod 11 disposed on the shutter 10, and a spring 12, a slide groove 21 communicating with the inside of the handle holder 2 and opposing to the pull rod insertion hole 52 is disposed on the handle holder 2, an extension portion 53 extending from the slide groove 21 to the outside of the handle holder 2 is disposed on the slider 5, the extension portion 53 has an inner cavity, a first extension portion through hole 531 communicating with the pull rod insertion hole 52 is disposed on one end of the extension portion 53 opposing to the slider 5, a second extension portion through hole 532 is disposed on one end of the extension portion 53 away from the slider 5, the first extension portion through hole 531 and the second extension portion through hole 532 are disposed on the same axis, a shutter slot 54 for the shutter 10 to linearly move toward the extension portion 53 (i.e. linearly move perpendicular to the axis of the slider 5) is disposed on the slider 5, the shutter slot 54 penetrates through one end surface of the slider 5 opposing to the fixed handle 3, the gate board slot 54 is opposite to and communicated with the first extending part through hole 531, the gate board 10 is arranged in the gate board slot 54, the push rod 11 penetrates through the inner cavity of the extending part 53 from the first extending part through hole 531 and then extends out of the extending part 53 from the second extending part through hole 532, the spring 12 is arranged in the inner cavity of the extending part 53 and is sleeved on the push rod 11, a gate board hole 101 is formed in the gate board 10, the gate board hole 101 and the pull rod inserting hole 52 are staggered in a natural state, so that the lower end hole wall of the gate board hole 101 is inserted into the clamping groove 71 in the pull rod 7, the pull rod 7 and the slider 5 are fixed, when the push rod 11 is completely pressed down, the gate board hole 101 is overlapped with the pull rod inserting hole 52, and the pull rod 7 is taken out.

As shown in fig. 2 and 3, the size of the second extension through hole 532 is matched with the end face of the extension 53, one end of the spring 12 extends out of the second extension through hole 532, the push rod 11 is provided with a limiting mechanism to limit the spring 12, the spring 12 is compressed when the push rod 11 moves towards the slider 5, and when the external force is lost, the spring 12 resets to push the limiting mechanism to drive the push rod 11 to reset.

As shown in fig. 3 and 4, the cross-sectional shape of the handle holder 2 is circular, the slider 5 is a cylinder, the pull rod insertion hole 52 is provided on the axis of the slider 5, the slider through groove 532 penetrates through the cylinder wall of the slider 5, two sides of the shutter 10 in the moving direction are straight edges, and two opposite side groove walls of the shutter slot 54 are matched with the two straight edges of the shutter 10.

As shown in fig. 3 and 4, a symmetrically arranged and protruding limiting portion 102 is arranged at one end of the shutter hole 101, which is far away from the push rod 11, a distance is arranged between the two limiting portions 102, so that a clamping hole 103 is formed in the shutter hole 101, the hole 104 is formed in the clamping hole 103, the clamping hole 103 is formed between the two limiting portions 102, the clamping hole 103 is opposite to the pull rod insertion hole 52 in a normal state, and the hole 104 is overlapped with the pull rod insertion hole 52 when the push rod 11 is pressed down.

The utility model discloses in, stop gear can adopt to set up the push pedal on push rod 11, makes spring 12's one end top in the push pedal, and the other end supports on extension 53 is located the one end terminal surface of first extension through-hole 531, and after pushing down push rod 11, the push pedal pushes down and makes spring 12 compress, loosens push rod 11 back, and spring 12 resets and promotes the push pedal and shifts up and reset.

As shown in fig. 2, 3 and 4, as a preferred embodiment of the present invention, the limiting mechanism is implemented by a structure, a push rod cap 105 movably connected with the push rod 11 is disposed on the end of the push rod 11 extending out of the extension portion 53, the diameter of the second extension portion through hole 532 is larger than the outer diameter of the spring 12, and the spring 12 extends out of the second extension portion through hole 532 and abuts against the push rod cap 105, so that a moving distance is provided between the push rod cap 105 and the extension portion 53; when the push rod cap 105 is pressed down, the push rod cap 105 forces the spring 12 to compress, and simultaneously pushes the shutter 10 to move downwards, so that the shutter hole 101 is overlapped with the pull rod insertion hole 52, and the pull rod 7 can be taken out from the handle seat 2; when the acting force on the push rod cap 105 is released, the spring 12 resets to drive the push rod cap 105 and the push rod 11 to move upwards, the gate plate hole 101 is staggered with the pull rod insertion hole 52, and the edge of one end hole of the gate plate hole 101, which is far away from the push rod 11, is inserted into the clamping groove 71 of the pull rod 7 so as to fix the pull rod 7; more specifically, when the push rod cap 105 is pressed down, the push rod cap 105 forces the spring 12 to compress, and simultaneously pushes the shutter 10 to move down, so that the through hole 104 is overlapped with the pull rod insertion hole 52, and the pull rod 7 can be taken out from the handle base 2; when the acting force on the push rod cap 105 is released, the spring 12 resets to drive the push rod cap 105 and the push rod 11 to move upwards, the clamping hole 103 is opposite to the pull rod insertion hole 52, and the limiting part 102 is inserted into the clamping groove 71 of the pull rod 7 to fix the pull rod 7.

In the present invention, the push rod cap 105 is connected to the push rod 11 by a screw connection so as to facilitate the detachment and sterilization.

As shown in fig. 1 and 2, one end of the connecting rod 9 is hinged to the portion of the rod body of the sliding rod 8 near the middle, and the other end is hinged to one end of the movable handle 4 far away from the handle base 2, so that the use and labor saving are facilitated.

As shown in fig. 2, the slider 5 is provided with a movable handle slot 51 into which the upper end of the movable handle 4 is inserted, and the upper end of the movable handle 4 is inserted into the movable handle slot 51; specifically, the upper end of the movable handle slot 51 is an arc surface, and the upper end surface of the movable handle 4 is also an arc surface, so as to facilitate the pulling of the slider 5 for movement, and preferably, a movable gap is formed between the movable handle slot 51 and the upper end of the movable handle 4, so as to meet a space required by the rotation of the movable handle 4.

As shown in fig. 2, a slide bar through slot 41 for the slide bar 8 to pass through is opened on the movable handle 4, so that the slide bar 8 can slide in the slide bar through slot 41.

In the present invention, the length of the connecting rod 9 is one half of the length of the sliding rod 8.

As shown in fig. 2, in the utility model discloses in, the articulated mode of fixed handle 3 and slide bar 8 is equipped with fixed handle groove 32 for the lower extreme at fixed handle 3, fixed handle groove 32 runs through fixed handle 3's preceding terminal surface, rear end face and lower terminal surface, be provided with articulated shaft hole at the both sides cell wall of fixed handle groove 32, correspondingly, slide bar 8's lower extreme also is equipped with articulated shaft hole, insert between fixed handle 3 and the slide bar 8 through articulated shaft 13 in articulated shaft hole between them, realize articulated between them.

As shown in fig. 1 and 2, the connection between the connecting rod 9 and the sliding rod 8 and the movable handle 4 can be realized by the following structure: the front end of the connecting rod 9 is provided with a connecting rod through groove 91, the connecting rod through groove 91 penetrates through the upper end face, the lower end face and the front end face of the connecting rod 9, hinge shaft holes are formed in the groove walls on the two sides of the connecting rod through groove 91, correspondingly, the middle part of the sliding rod 8 is also provided with the hinge shaft holes, the connecting rod through groove 91 is inserted on the sliding rod 8, the connecting rod 9 and the sliding rod 8 are inserted into the hinge shaft holes of the connecting rod 9 and the sliding rod 8 through a hinge shaft 14, and the hinge of the connecting rod 9 and the sliding rod 8 is realized; the lower end of the movable handle 4 is also provided with a movable handle through groove 42, the movable handle through groove 42 penetrates through the front end face, the rear end face and the lower end face of the movable handle 4, the movable handle through groove 42 is provided with a hinge shaft hole, correspondingly, the rear end of the connecting rod 9 is also provided with the hinge shaft hole, the connecting rod 9 is inserted into the movable handle through groove 42, and then the hinge shaft hole is inserted into the hinge shaft hole of the movable handle through the hinge shaft 15, so that the hinge between the movable handle and the movable handle is realized.

The connection mode of the fixed handle 3 and the movable handle 4 can be realized by adopting the following structure: as shown in fig. 1 and 2, a hinge seat 31 is provided on the fixed handle 3, a through groove (not shown in the figure) is provided on the hinge seat 31 at a side opposite to the movable handle 4, the movable handle 4 is V-shaped and includes a first movable portion 43 and a second movable portion 44, and the length of the first movable portion 43 is smaller than that of the second movable portion 44; a hinge part 45 is arranged at the joint of the first movable part 43 and the second movable part 44, the hinge part 45 is inserted into the through groove on the hinge seat 31, hinge shaft holes are arranged on the hinge seat 45 and the hinge part 31, and the hinge seat 31 is inserted into the hinge shaft holes of the hinge seat 45 and the hinge part 31 through a hinge shaft 16 and is hinged with the movable handle 4.

The improved structure of the laparoscopic surgery instrument handle is convenient to operate, and not only can the strength be saved to the maximum extent, but also the strength can be saved by three times of that in the prior art; the thumb and the index finger can be forced to be in a close-fitting state, so that the fatigue of the patient is reduced, and the operation speed is increased; the push rod cap is pressed, the flashboard moves downwards to enable the through hole to be coincided with the pull rod inserting hole, the pull rod can be inserted into the pull rod inserting hole, and after the push rod cap is loosened, the limiting part is clamped in the clamping groove of the pull rod under the action of the spring, so that the pull rod is connected and fixed with the sliding block 5; when the pull rod is disassembled, the push rod cap is pressed to enable the flashboard to move downwards, the through hole is coincided with the pull rod inserting hole again, the pull rod can be pulled out, and the disassembly and the assembly between the pull rod and the handle of the clamp instrument are facilitated; the cleaning and disinfection of the pull rod part of the clamp instrument are facilitated, and the cleaning and disinfection effects are improved.

Claims (6)

1. The utility model provides a ready-package laborsaving laparoscopic surgery pincers class apparatus handle, includes apparatus handle (1), apparatus handle (1) is including handle seat (2), fix fixed handle (3) on handle seat (2) and articulate activity handle (4) on handle seat (2), its characterized in that: the fixed handle (3) and the handle seat (2) are of an integral structure, the handle seat (2) is hollow, a sliding block (5) is arranged in the handle seat (2), one end of the handle seat (2) opposite to the movable handle (4) extends to the upper side of the movable handle (4) to form an insertion part (6), the sliding block (5) can move back and forth in the insertion part (6), a movable groove (61) is arranged at one end of the insertion part (6) opposite to the movable handle (4), the upper end of the movable handle (4) is inserted into the insertion part (6) from the movable groove (61) and is movably connected with the sliding block (5) so as to pull the sliding block (5) to move linearly towards the movable handle (4) when the movable handle (4) moves towards the direction of the fixed handle (3), a pull rod (7) is arranged in the handle seat (2), one end of the pull rod (7) is movably connected with the sliding block (5), and a sliding rod (8) is arranged at one end, far away from the handle seat (2), of the fixed handle (3), the sliding rod (8) is hinged with the fixed handle (3), a connecting rod (9) is arranged at one end of the movable handle (4) far away from the inserting part (6), and two ends of the connecting rod (9) are respectively hinged with the sliding rod (8) and the movable handle (4); one end of the sliding rod (8) far away from the fixed handle (3) extends to the outside of one side of the movable handle (4) far away from the fixed handle (3) towards the direction of the movable handle (4), and a finger ring (12) is arranged on the part of the rod body of the sliding rod (8) extending to the outside of one side of the movable handle (4) far away from the fixed handle (3); a pull rod inserting hole (52) is formed in one end, opposite to the pull rod (7), of the sliding block (5), a quick-release mechanism for fixing the pull rod (7) in the sliding block (5) is arranged on the sliding block (5), the quick-release mechanism comprises a flashboard (10), a push rod (11) and a spring (12) which are arranged on the flashboard (10), a sliding groove (21) which is communicated with the inside of the handle seat (2) and is opposite to the pull rod inserting hole (52) is formed in the handle seat (2), an extending part (53) which extends out of the handle seat (2) from the sliding groove (21) is arranged on the sliding block (5), the extending part (53) is provided with an inner cavity, a first extending part through hole (531) communicated with the pull rod inserting hole (52) is formed in one end, located on the sliding block (5), of the extending part (53), a second extending part through hole (532) communicated with the inner cavity of the extending part (53) is formed in one end, far away from the sliding block (5), of the extending part (53), the slide block (5) is provided with a flashboard slot (54) for the flashboard (10) to move linearly towards the direction of the extension part (53), the flashboard slot (54) is opposite to and communicated with the first extension part through hole (531), the flashboard (10) is arranged in the flashboard slot (54), the push rod (11) penetrates through the inner cavity of the extension part (53) from the first extension part through hole (531) and then extends out of the extension part (53) from the second extension part through hole (532), the spring (12) is arranged in the inner cavity of the extension part (53) and is sleeved on the push rod (11), the flashboard (10) is provided with a flashboard hole (101), under the natural state, the flashboard hole (101) and the pull rod insertion hole (52) are staggered, so that the lower end of the flashboard hole (101) is inserted into the clamping groove (71) on the pull rod (7), the pull rod (7) and the slide block (5) are fixed, when the push rod (11) is pressed down, the flashboard hole (101) and the pull rod insertion hole (52) are superposed, the pull rod (7) can be taken out.

2. The handle for ready-to-mount laborsaving laparoscopic forceps instruments according to claim 1, wherein: the sliding block (5) is provided with a movable handle slot (51) for inserting the upper end of the movable handle (4), and the upper end of the movable handle (4) is inserted into the movable handle slot (51).

3. The handle for a ready-to-mount, labor-saving laparoscopic forceps-like instrument as claimed in claim 1 or 2, wherein: keep away from the one end of push rod (11) in flashboard hole (101) and be equipped with symmetry setting and convex spacing portion (102), be equipped with the interval between two spacing portions (102) to form joint hole (103) on flashboard hole (101), pass hole (104), under the normality, joint hole (103) are relative with pull rod patchhole (52), when pushing down push rod (11), pass hole (104) and pull rod patchhole (52) coincidence.

4. The handle for ready-to-mount laborsaving laparoscopic forceps instruments according to claim 3, wherein: the end, extending out of the extension part (53), of the push rod (11) is provided with a push rod cap (105) movably connected with the push rod (11), the diameter of the second extension part through hole (532) is larger than the outer diameter of the spring (12), and the spring (12) extends out of the second extension part through hole (532) and is propped against the push rod cap (105), so that a movable distance is reserved between the push rod cap (105) and the extension part (53).

5. The handle for ready-to-mount laborsaving laparoscopic forceps instruments according to claim 1, wherein: a sliding rod through groove (41) for the sliding rod (8) to pass through is arranged on the movable handle (4), so that the sliding rod (8) can slide in the sliding rod through groove (41).

6. The handle for ready-to-mount laborsaving laparoscopic forceps instruments according to claim 1, wherein: the length of the connecting rod (9) is one half of the length of the sliding rod (8).

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