KR100686582B1 - The winch system where the rotation is free - Google Patents

Abstract

A winch system rotatable forward and backward is provided to reduce a brake time and simplify a structure of the winch system by positioning a motor adjacent to the winch system. A winch system rotatable forward and backward includes a housing(10), a drive shaft(40), a driven shaft(60), and a driven connection shaft(80). The housing has a ratchet wheel(20), and a pole(30). The ratchet wheel has an inner diameter(12) and an axial hole(22) in concentric with the inner diameter. The pole is pivotally fixed to one side of the housing to control the ratchet wheel. The drive shaft is inserted into the inner diameter of the housing to make its tip in surface contact with a right surface of the ratchet wheel, and has a threshold surface(44) having a predetermined depth of inner diameter(42). The driven shaft has a shaft(64) fixed to a center of a flange(62) in surface contact with a left side surface of the ratchet wheel. The driven connection shaft has an extension shaft(84) inserted into the driven shaft to be fastened to the tip of the driven shaft.

Description

The winch system where the rotation is free}

1 is a schematic perspective view of a typical manual winch.

2 is a cross-sectional view of a typical hoist.

3 is a front sectional view of the winch device according to the present invention.

4 is a cross-sectional view taken along the line IV-IV of FIG. 3.

5 is an enlarged exploded cross-sectional perspective view of the main part according to the present invention.

FIG. 6 is an enlarged cross sectional view of the forward recess of FIG. 5; FIG.

FIG. 7 is a half (1/2) pitch reverse action state sectional view of FIG. 5; FIG.

FIG. 8 is a sectional view of one pitch reverse action state of FIG. 5; FIG.

9 is a front sectional view of a manual forklift equipped with a device according to the present invention.

10 is an enlarged view of the winch device of FIG.

11 is a plan sectional view of a hoist equipped with a device according to the present invention.

Explanation of symbols on the main parts of the drawings

10 housing 20 ratchet wheel

30: pole 40: coaxial

50: driving means 60: driven shaft

70: driven means 80: driven connecting shaft

90: friction pad

The present invention relates to a winch device for free forward and reverse rotation.

In general, a winch is a general name for a machine that winds a wire rope around a cylindrical drum and lifts or pulls a heavy object to a high place using a pulley. In addition, the smaller one is a manual type that rotates the drum by hand, but the larger one is rotated by an electric motor or an internal combustion engine. The drum is equipped with a clutch or a brake so that the power can be transmitted or cut off from the prime mover. There are double- and multi-dong winches, and they are used in various industries such as civil engineering, ships, mines, etc. in heavy machinery transportation in machine shops.

 1 is a structure of a manual winch, referring to this, the manual winch 1 has a handle 12 is provided on one side and the pawl 15 for regulating the ratchet wheel 14 and the ratchet wheel 14 to the other side. The main shaft 11 and the drum 16, which is wound around the main shaft 11 at a predetermined interval, is configured, and a plurality of gear trains are configured between the main shaft 11 and the drum 16. It consists of a reduction gear 17.

In the manual winch 1 configured as described above, when the handle 12 is rotated in the direction of the arrow, the main shaft 11 coupled with the handle 12 is rotated, and the main shaft 11 and the drum 16 are rotated. As the rotation of the main shaft 11 is decelerated by the gear train of the reduction gear 17 configured therebetween, the rotation of the main shaft 11 is decelerated and transferred to the drum 16, thereby winding a rope or the like by the rotational force of the drum 16 to raise a heavy object. .

In addition, when the rotation of the handle 12 is stopped, the heavy material is about to fall by its own weight, but the other direction, that is, the direction opposite to the arrow, is rotated by a pawl intermittently regulating the ratchet wheel 14 provided on one side of the main shaft 11. This interruption keeps the weight wound around the drum 16.

In addition, when lowering the weight or unwinding the rope winding, the handle 12 may be rotated in the opposite direction to the arrow, but the ratchet wheel 14 described above remains in a state of being interrupted by the pawl 15. By rotating 15 to one side, that is, the pawl 15 releases the ratchet wheel 14, the handle 12 can be rotated in the other direction.

However, the manual winch has a problem in that the worker has to manually rotate the pawl regulating the ratchet wheel and the safety of the weight breakage and personal injury as the weight wound on the drum falls freely when the pawl rotates. There was a problem of being exposed to an accident.

In particular, the pawl may be arbitrarily released by the ratchet wheel due to the vibration of the heavy weight, the impact force generated during the movement, and the like, which causes a problem of frequent safety accidents.

That is, in the method employing the ratchet wheel and the pole as described above, a cumbersome process of releasing the pole from the ratchet wheel should be carried out when the direction of rotation is to be switched, and a safety accident during the operation of the pole There was a problem that occurred.

Figure 2 is a general hoist flat cross-sectional view, referring to the electric winch, that is, the hoist 100 is provided with a hoisting motor 102 on one side of the main frame 101, the intermediate shaft extending through the hoisting motor 102 The other side of the 103 is provided with a speed reducer 104 and a brake 105, and a drum 106 having an intermediate shaft 103 inserted between the hoisting motor 102 and the speed reducer 104 is a speed reducer 104. Is connected to, the plurality of wheels 107 on the outer periphery of the main frame 101 is configured to rotate by the rotational force of the driving motor 108.

Looking at the operation state of the hoist 100 configured as described above, the intermediate shaft 103 is rotated by the forward and reverse rotational power of the hoisting motor 102, the reducer 104 provided on the other side of the intermediate shaft 103 The rotational force of the hoisting motor 102 is transmitted to the drum 106 in a decelerated state, and the drum 106 is wound or unwound according to the rotational direction.

In addition, when the heavy object is floated in the air through the rope of the drum 106 is wound or released by the stop of the hoisting motor 102, the intermediate shaft through the brake 105 provided on one side of the reducer 104 Intermittent rotation of the 103 prevents free fall of the heavy object.

However, although the brakes are classified into mechanical and electronic systems, the braking time of the brakes is long due to the stop time of the electric motor and the gear train backlash of the reducer.

The present invention has been made to solve the above problems, an object of the present invention is to facilitate the rotation and braking according to the ratchet wheel and pole method, and to change the positive and reverse rotation freely without the pole release process In order to provide a winch system, reverse rotation is free.

In order to achieve the above object, the present invention, the ratchet wheel having an inner diameter, having a shaft hole in the concentric circle of the inner diameter is engraved perpendicularly to the center portion, the pawl for regulating the ratchet wheel is fixed to be rotatable on one side. A housing; The ratchet wheel is inserted into the inner diameter of the housing such that the right side face and the front end face thereof are in contact with each other, and a stepped surface having an inner diameter of a predetermined depth is formed from the rear end to the front end. A driving shaft coupled thereto; A shaft having an inner diameter is fixed at the center of the flange portion in which the left side surface and the rear end surface of the ratchet wheel are in surface contact, and the rear end of the shaft has a male screw portion which is engaged with the female screw hole of the driving shaft, and the driven means is coupled to the front end. Coaxial; And a driven connecting shaft inserted into the inner diameter of the driving shaft and extending from the center of the head that is engaged on the stepped surface is inserted into the inner diameter of the driven shaft to be fastened and fixed at the tip of the driven shaft.

In the present invention, it is preferable that a friction pad is further configured between the driving shaft and the driven shaft which are in surface contact with the left or right side of the ratchet wheel.

In the present invention, the first projection protruding to the rear end is formed on the stepped surface of the driving shaft; The head of the driven connecting shaft is formed with a second projection at the same length as the first projection at the tip; It is preferable that the side surfaces of the first and second protrusions are configured to abut each other.

In the present invention, between the extended shaft of the driven connecting shaft inserted into the inner diameter of the driven shaft is formed a planar portion that is mutually coupled so that the rotational force of the driven connecting shaft is easily transmitted to the driven shaft, the flat portion is formed in a hexagonal shape, It is preferable that a hexagonal groove is formed at a predetermined position on the inner diameter of the driven shaft, and a hexagonal head is formed at a position corresponding to the groove on the extension shaft of the driven connection shaft.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view of the winch device, FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3, and FIG. 5 is an enlarged exploded cross-sectional perspective view of the main part. Referring to this, the ratchet wheel 20 intermittent by the pawl 30 is A housing 10 which stands vertically in the center and supports it; A driving shaft 40 which is formed on the right side of the ratchet wheel 20 of the housing 10 and is rotated forward and reverse by forward and reverse rotational force of the driving means 50; A driven shaft 60 configured at a left side of the ratchet wheel 20 of the housing 10 and having a driving means 70 at one side thereof coupled to a distal end of the driving shaft 40; And a driven connecting shaft 80 provided between the driving shaft 40 and the driven shaft 60.

The housing 10 has a space for supporting the ratchet wheel 20 which is erected in the center and the pawl 30 which controls the ratchet wheel 20, and the ratchet wheel 20 is horizontally formed. The inner diameter 12 penetrates, and the shaft hole 22 is formed in the ratchet wheel 20 concentrically with the inner diameter 12 so that the driven shaft 60 is inserted through the shaft hole 22. .

In addition, the inner diameter 12 of the housing 10 is formed with a bearing 14 supporting the driven shaft 60 and the driving shaft 40 which are inserted to both the left and right sides around the ratchet wheel 20. In addition, the bearing 14 is a means for minimizing the frictional force caused by the rotation of the driving shaft 40 and the driven shaft 60, for example, it can be replaced by means such as bushing (bushing).

In addition, the pawl 30 is an elastic member for stopping the ratchet wheel 20 when the ratchet wheel 20 is rotated in another direction as a means for intermittent rotation of the ratchet wheel 20 and returning it to its original position. C) is further configured, so a detailed description thereof will be omitted.

Referring to FIG. 5, when the driving shaft 40 is set as a front end side of a portion located on the right side of the ratchet wheel 30, the stepped surface 44 having an inner diameter 42 having a predetermined depth from the rear end to the front end is formed. ), But the female screw hole 46 having a diameter smaller than the inner diameter 42 is formed from the stepped surface 44 to the tip.

In particular, the stepped surface 44 is formed with a first protrusion 48 protruding to the rear end, and is in surface contact with the second protrusion 86 to be described later.

In addition, the front end portion of the driving shaft 40 is in close contact with the front end surface of the ratchet wheel 20 through the bearing 14 formed in the housing 10, the driving means 50 for generating a rotational force on the rear end is To be combined.

In this case, the driving means 50 may be divided into a manual type that generates a rotational force by a manual device such as a steering wheel or a manual device that generates a rotational force manually by a separate device such as a motor. ) Is a general technical idea, and thus a detailed description thereof will be omitted.

Referring to FIG. 5, when the driven shaft 60 is set to be described as a rear end side of a portion located on the left side of the ratchet wheel 20, a predetermined position of the shaft 64, that is, the left side of the ratchet wheel 20 is described. A flange 62 is formed at a position where a surface and a rear end surface are in surface contact, a penetrating inner diameter 66 is formed at the center of the shaft 64, and a groove 66a having a flat portion at the tip of the inner diameter 66. ) Is provided to be fitted to each other in the same shape as the hexagonal head portion 84a of the driven connecting shaft 80 to be described later.

In addition, a male screw portion 68 is formed at the rear end of the shaft 64, and is screwed to the female screw hole 46 of the circular shaft 40, and the driven means 70 is coupled to the front end.

Here, the driven means 70 is a combination of a variety of devices that require one-way intermittent through the winch device.

Meanwhile, a friction pad 90 is further configured between the driving shaft 40 and the driven shaft 60 respectively configured on the right or left side of the ratchet wheel 20, and the friction pad 90 is frictional. It is preferable to use what is called a brake pad as a material with a high coefficient, and it is more preferable to be comprised between the left side surface of the ratchet wheel 20 and the rear end surface of the flange 62 of the driven shaft 60 especially.

Referring to FIG. 5, the driven connecting shaft 80 includes a head 82 and an extension shaft 84 extending from the head 82, and the extension shaft 84 is a flat portion at a predetermined position. Hexagonal head portion 84a is formed to be fitted into the groove 66a of the driven shaft 60 described above, and an external thread portion is formed at the end.

In addition, the driven connecting shaft 80 is inserted into the extension shaft 84 through the inner diameter 42 of the driving shaft 40, the head portion on the stepped surface 44 of the inner diameter 42 of the driving shaft 40 82 is engaged, the extension shaft 84 is inserted into the inner diameter 66 of the driven shaft 60, has a coupling relationship that is fixed at the end by a fastening means such as a nut, the fastening means is extended As a means for fixing the protrusion of the shaft 84, a fixing means such as a stop ring or a pin may be used.

In particular, a second protrusion 86 protrudes from the head portion 82 of the driven extension shaft 80, and the surface contact with the first protrusion 48 protruding from the step surface 44 of the circular shaft 40. It is configured to be.

Referring to Figure 3, looking again at the coupling relationship of the winch device, on the right side of the housing 10, the ratchet wheel 20 and the pole 30 is composed of a driving shaft 40, the driving means 50 is coupled to the rear end The left side of the housing 10 is composed of a driven shaft 60 coupled to the driven means 70 at the front end.

In addition, a male connecting portion 68 of the driven shaft 60 is spirally fastened to the female screw hole 46 of the driving shaft 40, and a driven connecting shaft inserted through the inner diameter 42 of the driving shaft 40. 80 is an extension shaft 84 is inserted into the inner diameter 66 of the driven shaft 60 is protruded to the end in the state that the head 82 is locked to the step surface 44, the protruding extension shaft ( A nut is fastened to 84 to prevent the driven connecting shaft 80 from being randomly separated.

In this case, it is preferable that a predetermined distance is maintained between the nut and the driven shaft 60, and the friction pad 90 is disposed between the left side of the ratchet wheel 20 and the flange portion 62 of the driven shaft 60. ) Is configured.

Looking at the operating state of the winch device configured as described above are as follows.

FIG. 6 is a cross sectional view of the forward recessed portion of FIG. 5, and FIG. 7 is a half (1/2) pitch reverse action state sectional view of FIG. 5, and FIG. 8 is a one pitch reverse action state sectional view of FIG. 5. As such, referring firstly, when a forward or reverse rotation direction is generated through the driving means 50, the driving shaft 40 is rotated forward or reverse.

For example, referring to FIG. 6, it is assumed that the forward rotation direction of the prime mover 50 is counterclockwise (arrow direction), and the female screw hole of the prime mover shaft 40 is connected to the male screw portion 68 of the driven shaft 60. It is assumed that the locking direction is assumed to advance to the tip when the 46 is rotated counterclockwise at the time of tightening.

The driving shaft 40, which is rotated in the forward direction through the driving means 50, is advanced along the helix of the male screw portion 68 of the driven shaft 60 to pressurize the ratchet wheel 20, and further, the ratchet The friction pad 90 and the flange 62 located on the left side of the wheel 20 are pressed.

In addition, in the state in which the second projection 86 located on the side surface of the first projection 48 of the stepped surface 44 is in contact with the driving shaft 40, the second projection is formed by the positive rotational direction of the driving shaft 40. The driven connecting shaft 80 of the head 82 having the 86 formed therein is rotated by the forward rotational force, and the fitting coupled to the flat portion, that is, the hexagonal head 84a, on the other side of the extension shaft 84. As the forward rotational force is transmitted to the coaxial 60, the ratchet wheel 20 and the driven shaft 60 are forwardly rotated together with the primary shaft 40 by the pressing force and the rotational force.

At this time, since the pawl 30 for regulating the ratchet wheel 20 does not interrupt the forward rotation of the ratchet wheel 20, the pawl 30 passes over the gear teeth and is repeatedly returned to its original position by an elastic member (not shown). In addition, when the forward rotation of the driving shaft 40 is stopped, the reverse rotation of the ratchet wheel 20 is to be interrupted.

Referring to FIGS. 7 and 8, when the driving means 50 is rotated in the reverse rotation direction, the driving shaft 40 is rotated in the reverse direction (arrow direction).

In addition, the driving shaft 40 is unwinded in the spiral direction of the male screw portion 68 of the driven shaft 60, and the driven connecting shaft 80 inserted into the inner diameter 42, the first projection 48 is As it rotates in a direction opposite to the direction of surface contact with the second projection 86, the head 82 caught on the step surface 44 is pushed backward without interfering with the rotation of the driving shaft 40, resulting in a driven connecting shaft. 80 is reversed.

Referring to FIG. 7 through this, a gap is formed between the tip left side of the driving shaft 40 and the right side of the ratchet wheel 20.

In addition, the first projection 48 formed on the inner diameter 42 of the cylindrical shaft 40 is in close contact with the side surface of the second projection 86 due to the continuous rotation of the driving shaft 40 to be forced to rotate. The ratchet wheel 20 and the driving shaft 40 is formed with a gap.

In addition, the forcibly rotated driven connecting shaft 80 is a forced rotational force is transmitted to the groove 66a coupled to the hexagonal head portion 84a, and eventually the driven shaft 60 is rotated.

At this time, even if the driven shaft 60 is to transmit the rotational force to the friction pad 90 and the ratchet wheel 20 formed on the right side of the flange portion 62, the friction pad 90 and the ratchet wheel 20 The gap as much as the gap with the driving shaft 40 is formed so that it can not interfere with the rotation of the driven shaft (60).

Therefore, the reverse rotation of the driving shaft 40 is transmitted to the driven shaft 60 on the other side through the driven connecting shaft 80 inserted into the inner diameter 42, the driven shaft 60 is friction pad 90 And the ratchet wheel 20 can be rotated without friction interference.

In addition, the ratchet wheel 20 is stopped by the reverse rotation by the pole 30 to maintain a stopped state.

In addition, when the reverse rotation of the driving shaft 40 is stopped, the ratchet wheel 20 is maintained in a state where a gap is formed, and in this case, if the weight is pulled up through the driven means 70, by the weight Follower means 70 is a forward rotation is generated through the free fall through which the driven shaft 60 is forwardly rotated.

At this time, as the driven shaft 60 is rotated forward, as the male screw hole 46 spirally coupled to the male screw portion 68 formed on one side is pulled along the spiral direction, the driving shaft 40 is eventually advanced.

The driven shaft 40 advanced through this is driven by the pressing force for pressing the flange 62, the friction pad 90 and the ratchet wheel 20 of the driven shaft 60 in the same manner as the above-described forward rotational action state. At 60, free fall of the driven means 70 is suppressed.

Of course, the ratchet wheel 20 is able to intermittent rotation of the driven shaft 60 by the interruption by the pole 30, the rotational force generated in the driven means 70 is driven shaft 60 as in the above case Even if the driven shaft 60 is driven, arbitrary rotation is suppressed by the adhesion force of the friction pad 90 and the ratchet wheel 20 under the pressing force of the driving shaft 40.

Therefore, without the intermittent releasing operation of the pawl 30 for regulating the ratchet wheel 20 has the simplicity of use that can freely interlock the forward and reverse rotation of the driven shaft 60 only by the rotational force of the driving shaft 40. will be.

9 is a front sectional view of a manual forklift equipped with a distal device, and FIG. 10 is an enlarged view of the winch device of FIG. 9. Referring to this, the manual forklift is vertically elevated along the mainframe and the mainframe. It is provided on one side of the fork frame and the main frame, and a distal device for providing a lifting force to the fork frame is configured.

Here, the base device is equipped with the base device according to the present invention described above, the housing 10 including the ratchet wheel 20 and the pole 30 is fixed to the main frame, the housing 10 of the Consists of a driven shaft 40 configured on the right side and a driven shaft 60 configured on the left side of the housing 10 and a driven connecting shaft 80 connecting the driven shaft 40 and the driven shaft 60. do.

In addition, the driving shaft 40 is coupled to the driving means 50, the driving means 50 is composed of a handle 52 so that the operator can directly generate a rotational force, in this case the handle 52 Is formed by the fastening means for forming a long hole in the driving shaft 40, and fastening between the long hole and the handle 52.

In addition, the driven means (60) is coupled to the driven means (70), the driven means (70) is generally coupled to the chain sprocket (72) as the power transmission means by the chain and chain sprocket is used in the forklift Configuration.

In the operating state of the winch device configured as described above, when the handle 52 is rotated forward, the turning power is generated in the driving shaft 40, and the turning power is transmitted to the driven shaft 40, and the driven shaft 60 is rotated. The chain sprocket 72 configured in the forward rotation, through which the fork frame is raised.

In addition, when the handle 52 is reversely rotated, the driven connecting shaft 80 inserted into the driving shaft 40 reversely rotates the driven shaft 60 so that the fork frame is lowered. Since it is the same as the above description, a detailed description thereof will be omitted.

Therefore, the winch device has the advantage that the operator can freely rotate forward and reverse without releasing the pawls for ratcheting the ratchet wheel. It has the effect of eliminating.

11 is a plan sectional view of a hoist equipped with a hoist device. Referring to this, the hoist is provided with a hoisting motor 54 connected to the main shaft 40 of the winch device on one side of the main frame 101. The reducer 104 is provided on the other side of the intermediate shaft 103 connected to the driven shaft 60 of the drum 106 between the hoisting motor 102 and the reducer 104 with the intermediate shaft 103 inserted therein. It is connected to the speed reducer 104, and a plurality of wheels 107 on the outer periphery of the main frame 101 is configured to rotate by the rotational force of the driving motor 108.

That is, the extension shaft of the hoisting motor 54 is coupled to the rear end of the primary shaft 40 of the primary device to serve as the driving means 50 for generating the rotational force of the forward and reverse rotation, and the line of the driven shaft 60. The stage is connected to the intermediate shaft 103 and the coupling means, such as by the coupling means 70 serves to follow.

Therefore, the conventional hoist has a problem that the braking time is long as the brake made of a combination of mechanical devices detects the rotational speed of the hoisting motor and the like, and the maintenance and the unit cost are high, especially the structure is complicated. The homing device has the effect of shortening the braking time and having a simple structure and lowering maintenance and unit cost because it is configured near the motor.

In this way, the ratchet wheel and the pawl method can be easily rotated and braked, and there is an effect of freely changing the forward and reverse rotations without the release of the pawl.

What has been described above is only one embodiment for implementing the winch device free forward and reverse rotation according to the present invention, the present invention is not limited to the above embodiment, of the present invention as claimed in the following claims Without departing from the gist of the present invention, one of ordinary skill in the art will have the technical spirit of the present invention to the extent that various modifications can be made.

Claims (5)

A ratchet wheel 20 having an inner diameter 12, and having a shaft hole 22 in a concentric circle of the inner diameter 12 is engraved perpendicularly to a central portion thereof, and a pawl 30 that clamps the ratchet wheel 20 on one side thereof. A housing 10 fixed to be rotatable; The ratchet wheel 20 is inserted into the inner diameter 12 of the housing 10 such that the right side surface and the front end surface thereof are in contact with each other, and a stepped surface 44 having an inner diameter 42 having a predetermined depth is formed from the rear end to the front end thereof. A female screw hole 46 is formed from the stepped surface 44 to the front end, and a rear end of the driving shaft 40 to which the driving means 50 are coupled; A shaft 64 having an inner diameter 66 is fixed to the center of the flange portion 62 in which the left side surface and the rear end surface of the ratchet wheel 20 are in surface contact, and the driving shaft 40 is fixed to the rear end of the shaft 64. A male screw portion 68 fastened to the female screw hole 46 of the driven shaft, and a driven shaft 60 to which the driven means 70 is coupled to the front end thereof; And An extension shaft 84 that is inserted into the inner diameter 42 of the driving shaft 40 and extends from the center of the head 82 that is locked to the step surface 44 is inserted into the inner diameter 66 of the driven shaft 60. And a driven connecting shaft (80) fastened and fixed at the tip of the driven shaft (60). The method of claim 1, The winch device of the forward and reverse rotation is free, characterized in that the friction pad 90 is further configured between the driving shaft 40 and the driven shaft 60 in contact with the left or right side of the ratchet wheel (20). The method of claim 1, A first projection 48 protruding to a rear end is formed on the stepped surface 44 of the driving shaft 40; A head portion 82 of the driven connecting shaft 80 has a second projection 86 formed at the front end with the same length as the first projection 48; The winch device of the forward and reverse rotation is free, characterized in that the side of the first and second projections (48, 86) are configured to abut each other. The method of claim 1, Between the extension shafts 84 of the driven connecting shaft 80 inserted into the inner diameter 66 of the driven shaft 60 is interfitted so that the rotational force of the driven connecting shaft 80 is easily transmitted to the driven shaft 60. The winch device of the forward and reverse rotation free, characterized in that the flat portion is formed to be coupled. The method of claim 4, wherein The flat portion is formed in a hexagonal shape, The inner diameter 66 of the driven shaft 60 is formed with a hexagonal groove 66a at a predetermined position, Winch device of the forward and reverse rotation is free, characterized in that the hexagonal head portion (84a) is formed in the extension shaft (84) of the driven connecting shaft (80) corresponding to the groove (66a).

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