JP2006160500A - Winch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To securely prevent a winch from reverse wind by preventing it from being rotated in a reverse direction even if a handle is further rotated continuously in the reverse direction erroneously by a worker after unwinding operation is completed. <P>SOLUTION: The end face of a shaft 2 on the opposite side of a side where the handle 1 is installed is axially pressed in the axial direction by a spring plunger, and a stopper plate 13 having a projection 14 projected in the direction of the handle is fixed between the handle 1 of the shaft 2 and a bush 9. When the unwinding of a wire from a drum 18 is completed and the handle 1 is further rotated reversely in the non-tensed state of the wire, a pinion gear 6 is moved by the threading of a male screw part formed in the outer periphery of the shaft with a female screw part formed in the inner periphery of the pinion gear 6, the shaft 2 is pressed by the spring plunger to move the stopper plate 13, and the projection 14 abuts on a reverse rotating stopper 17 to stop the rotation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a winch that winds and unwinds a wire, for example, a winch that winds and unwinds a wire for raising and lowering a telescopic column of a projector having a lighting fixture attached to an upper end portion.

  FIG. 4 is a diagram illustrating a projector. In FIG. 4, 1 is a handle, 18 is a drum, 25 is a wire, 26 to 28 are first to third telescopic columns, 29 is an illumination lamp, and 30 is a generator. The telescopic struts 26 to 28 are provided vertically on the carriage, and a predetermined number of illumination lamps 29 are attached to the upper end. Then, by operating the winch handle 1 attached to the first telescopic strut 26, the wire 25 is wound around the winch drum 18, and as a result, the second and third telescopic struts 27, 28 are moved upward. Extend and stop the winch when it reaches the required height at the top or halfway. In this state, the illuminating lamp 29 is turned on by power supply from the generator 30 to illuminate night construction or various events.

  FIG. 5 is an explanatory view of the extension / contraction operation of the extension / contraction column of the projector. The second and third telescopic struts 27 and 28 are slidable up and down in the first telescopic strut 26, and the tip of the wire 25 is fixed to the lower end of the second telescopic strut 27. The winch drum 18 is wound around a pulley 31 installed at the upper end of the first telescopic support column 26. In addition, the tip of another wire 33 is fixed to the lower end of the third telescopic support column 28, and the other end of the wire 33 is fixed to the lower end of the second expandable support column 27 and is extended upward by a support column. 2 It is being fixed to the lower end part of the 1st expansion-contraction support | pillar 26 via the pulley 34 installed in the upper end part of the expansion-contraction support | pillar 27. FIG. Further, an assisting coil spring 32 is installed between the lower end of the second telescopic strut 27 and the lower end of the first telescopic strut 26, and the load on the portion above the second telescopic strut 27 is reduced by the force of the coil spring 32. Thus, the tension of the wire 25 is reduced, and the hand load of the handle 1 is reduced.

  When the winch drum 18 is wound up with the second and third telescopic struts 27 and 28 at the lowermost end, the second telescopic strut 27 is raised by the wire 25. At this time, the pulley 34 installed at the upper end of the second telescopic support 27 also moves upward, and the length of the wire 33 that is hung around the pulley is constant. The lower end portion of the third telescopic support 28 is also raised. When the winch drum 18 is rewound, the second and third telescopic struts 27 and 28 are lowered by the reverse operation.

  Next, the structure of a manual winch that is conventionally used will be described. FIG. 6 is an exploded view of a conventional winch. 6, parts corresponding to those in FIGS. 4 and 5 are denoted by the same reference numerals, 2 is a shaft, 3 and 4 are lock nuts, 5 is a male screw part, 6 is a pinion gear, and 7 is a screw. A veneer, 8 is a ratchet, 9 is a bushing, 10 is a nylon washer, 11 is a brake disc, and 12 is a winch frame.

  The shaft 2 is rotatably held by a bushing 9 inserted in the round hole 38 of the winch frame 12. A stop ring groove 35 is provided at the end of the shaft 2, and a shaft (not shown) is inserted into the stop ring groove 35 so that the shaft 2 does not come out on the opposite side. Further, a pinion gear 6, a lash plate 7, a ratchet 8, and a nylon washer 10 are mounted on the shaft 2 in a freely rotatable state, and the brake disk 11 and the handle 1 are connected to the screw portion 36 at the tip by lock nuts 3 and 4. To fix. At that time, since the screw portion 36 has one side surface cut into a flat surface and has a half-moon shaped cross-section, and the insertion hole of the brake disk 11 and the handle 1 is a half-moon shaped hole 37, the handle 1, the shaft 2 and the brake disk 11 are It is designed to rotate integrally. Further, the male screw portion 5 has a right-hand thread, and the pinion gear 6 has a female screw corresponding to the male screw portion 5 inside.

  Also, drum shaft holes 39, 39 are provided at the end opposite to the round hole 38 of the winch frame 12, and the shaft bolt holes 40 of the drum 18 are aligned therewith, and bolts ( The drum 18 is rotatably attached by passing it (not shown). At that time, the gear provided on one flange of the drum 18 and the pinion gear 6 are in meshing relation. The winch is attached to the first telescopic support column 26 in the vertical direction so that the drum 18 side is up and the shaft 2 side is down.

  The operation of the winch is as follows. That is, when the second and third telescopic columns 27 and 28 are raised, the handle 1 is turned clockwise (rotated clockwise). As a result, the shaft 2 also rotates clockwise. When the shaft 2 rotates clockwise, the male screw portion 5 of the shaft 2 and the female screw of the pinion gear 6 are disengaged from each other, and the pinion gear 6 moves toward the handle 1 side. When the pinion gear 6 moves in the direction of the handle 1, the slat plate 7, ratchet 8, and nylon washer 10 are pressed against the brake disc 11.

  As a result, when the handle 1 continues to rotate clockwise, the shaft 2, the pinion gear 6, the sill plate 7, the ratchet 8, the nylon washer 10, and the brake disc 11 are rotated together, and the pinion gear 6 is turned into a drum. 18 is turned counterclockwise to wind up the wire 25.

  When the wire 25 is wound up, the second and third telescopic struts 27 and 28 are lifted. Finally, a stopper (not shown) provided at the bottom of the second telescopic strut 27 is placed on the top of the first telescopic strut 26. If you hit it, you can no longer rise. When the hand is released from the handle 1, the drum 18 is pulled by the wire 25 and tries to rotate right. However, the rotation of the drum 18 is prevented by engaging the teeth of the ratchet 8 with a ratchet claw (not shown). The second and third telescopic struts 27 and 28 stop at that position.

  Next, a case where the second and third telescopic columns 27 and 28 are lowered will be described. When the handle 1 is turned counterclockwise, the shaft 2 is also turned counterclockwise, and the female screw of the pinion gear 6 is screwed into the male screw portion 5 of the shaft 2, so that the pinion gear 6 moves away from the handle 1, that is, The pressure on the sill plate 7 is moved in a direction that loosens. When the eyelash plate 7 is loosened, the drum 18 is pulled clockwise by the wire 25, so the pinion gear 6 tries to rotate counterclockwise, and the rotation of the eyelash plate 7 is again pressed against the handle 1 to stop the rotation. . If the handle 1 is continuously turned counterclockwise, the second and third telescopic struts 27 and 28 are lowered while repeating such an operation. Actually, it turns smoothly at a halfway position due to screw friction and the like, and as a result, it descends smoothly.

  When the second and third telescopic struts 27 and 28 are completely lowered and the load of the wire 25 is eliminated, the pinion gear 6 is not subjected to the rotation from the drum 18. The pinion gear 6 is moved in the direction away from the handle 1 by the male screw portion 5 to loosen the sill plate 7, and the slat plate 7 becomes free. In normal operation, the handle 1 is lightened at this point, and the second and third telescopic struts 27 and 28 are also lowered to the lowest end. Therefore, the operator should stop the operation. Does not happen.

  However, if the handle 1 is further turned counterclockwise for some reason, or the next operation is attempted to raise the second and third telescopic struts 27 and 28, the handle 1 is accidentally turned in the reverse direction. In some cases, the pinion gear 6 starts to rotate counterclockwise due to friction between the shaft 2 and the threaded portion of the pinion gear 6. As a result, when the drum 18 starts to rotate clockwise and continues to rotate as it is, the loosened wire 25 starts to be wound in the reverse direction. When the reverse winding proceeds, a counterclockwise force is applied to the drum 18 by the tension of the wire 25, and a clockwise force is applied to the pinion gear 6. If the handle 1 is further turned counterclockwise, the female screw portion of the pinion gear 6 enters the deepest portion of the male screw portion 5 of the shaft 2. If this happens, the ratchet 8 is already in a reversely wound state and the ratchet 8 is already separated from the cover plate 7, so that if the hand is released from the handle 1, the second and third telescopic struts 27 and 28 fall into a dangerous state at the same time. Become.

  In order to prevent such reverse winding, conventionally, a winch reverse winding prevention mechanism as shown in Patent Document 1 has been proposed. FIG. 7 is a view showing a conventional winch reverse winding prevention mechanism. Parts corresponding to those in FIG. 6 are denoted by common reference numerals. This reverse winding prevention mechanism is shown when applied to a winch in which the drum 18 is directly rotated by the shaft 2 directly connected to the handle 1 without using the pinion gear 6.

  A male screw portion 44 is formed on the outer periphery of the shaft 2 near the handle 1, and a female screw portion 45 is formed on the inner periphery of the drum 18 so as to be screwed into the male screw portion 44. The drum 18 is relatively screwed in the direction of the handle 1 by the rotation operation, and the drum 18 is relatively screwed in the direction away from the handle 1 by the rotation operation of the handle 1 in the reverse direction.

  A ratchet 8 is rotatably mounted between the fixed plate 41 fixed to the outer periphery of the end of the shaft 2 on the handle 1 side and the drum 18, and a lash plate 42 is provided between the ratchet 8, the drum 18 and the fixed plate 41. , 42 are provided. The ratchet 8 engages with the ratchet pawl 43 and rotates only in the wire winding direction. When the drum 18 is screwed in the direction of the handle 1 by the clockwise operation of the handle 1, the drum 18 The shaft 2, the drum 18, and the ratchet 8 are integrated with the ratchet 8 sandwiched between the shaft 18 and the fixed plate 41, and the rotation of the drum 18 in the wire feeding direction is restricted.

On the other hand, in order to lower the telescopic strut after the work is finished, the wire 18 starts to be rewound from the drum 18, and after the rewinding is finished, when the handle 1 is further rotated in the reverse direction, By screwing away from the handle 1, the internal thread part 45 on the inner periphery of the drum is disengaged from the external thread part 44 on the outer periphery of the shaft 2, and the drum 18 is idled. In this way, the wire is prevented from being reversely wound around the drum 18.
JP 2002-284485 A

  However, in the above conventional winch, even if the handle 1 is further rotated in the reverse direction after the rewinding is completed, the reverse winding of the drum 18 can be prevented. In addition, if the reverse rotation is frequently repeated, the inner surface of the drum 18 wears out the male screw portion 44 on the outer periphery of the shaft 2, and there is a problem that the next screwing may not be smoothly performed.

  In view of such a problem, the present invention prevents the handle 1 from rotating in the reverse direction even if the operator mistakenly tries to continue rotating the handle 1 in the reverse direction after the rewinding is finished. Thus, it is an object to promptly recognize that the worker is rotating in the reverse direction, to prevent the reverse winding surely, and to prevent the apparatus from being worn away.

  In order to solve the above-mentioned problem, the winch according to claim 1 has a handle fixed to one end, and rotates the handle in a forward direction to project the shaft for rotating the wire winding drum in the axial direction of the shaft. A stopper plate having a protrusion to be fixed is fixed, and after the wire has been rewound from the drum, when the handle continues to rotate backward, the protrusion hits the reverse winding stopper to prevent rotation. To do.

  Further, the winch according to claim 2 has a male screw part at a part of the outer periphery in the axial direction, a handle is fixed at one end, is rotatable to the winch frame via the bushing, and is movable in the axial direction. A shaft attached in a state, a spring plunger that axially presses an end surface of the shaft opposite to the handle fixing side, and a female that is rotatably attached to the shaft and screwed into the male screw portion A pinion gear having a threaded portion on the inner surface, a drum that winds the wire by being rotated by the pinion gear when the handle is rotated forward, and a brake disk that is fixed between the bushing and the handle of the shaft; A stopper plate that protrudes in the axial direction on the outer periphery and is fixed between the brake disc and the handle of the shaft, and the protrusion When the handle is further rotated in the reverse direction after the wire has been rewound from the drum, the pinion gear is engaged by screwing the male screw portion and the female screw portion. Is moved in the direction opposite to the handle, and as a result, the shaft is pushed by the spring plunger and the stopper plate moves in the direction of the handle, so that the protrusion hits the counter-winding stopper and is prevented from rotating. To do.

The winch of the present invention has the following effects.
That is, the winch according to claim 1, after fixing a stopper plate having a protrusion protruding in the axial direction of the shaft to the shaft that rotates the wire winding drum, and after rewinding the wire from the drum, When the handle is continuously rotated in the reverse direction, the protrusion hits the reverse winding stopper to prevent the rotation. As a result, even if the operator mistakenly continues to rotate the handle in the reverse direction after the rewinding is completed, the handle cannot be rotated in the reverse direction without causing the device to be worn, Reverse winding can be reliably prevented.

  The winch according to claim 2 is a stopper having an axially protruding projection on the outer peripheral portion between the handle and the bushing while pressing an end surface of the shaft opposite to the handle in the axial direction with a spring plunger. When the plate is fixed, unwinding is completed, and the handle continues to rotate in a state where the wire is no longer in tension, the screw between the male thread provided on the outer periphery of the shaft and the female thread provided on the inner surface of the pinion gear As a result, the pinion gear moves, the shaft is pushed by the spring plunger, the stopper plate moves, and the projection hits the reverse winding stopper to prevent the rotation. As a result, even if the operator mistakenly continues to rotate the handle in the reverse direction after the rewinding is completed, the handle cannot be rotated in the reverse direction without causing the device to be worn, Reverse winding can be reliably prevented.

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

  FIG. 1 is a view showing a main part of the winch of the present invention, and FIG. 2 is an overall view of the winch of the present invention. The parts corresponding to those in FIG. 6 are denoted by the same reference numerals, 13 is a stopper plate, 14 is a protrusion, 15 is a cylindrical part, 16 is a stopper mounting frame, 17 is a reverse winding stopper, and 19 is a spring plunger. .

  In the winch of the present invention, the shaft 2 is supported by the winch frame 12 in a state in which the shaft 2 can be slightly slid in the axial direction as compared with that of FIG. 6, and the stopper plate 13 with the protrusion 14 and the stopper with the reverse winding stopper 17. The difference is that a mounting frame 16 and a spring plunger 19 are added.

  The brake disk 11 and the stopper plate 13 are fixed to the shaft 2 and rotate integrally with the handle 1 and the shaft 2. The stopper mounting frame 16 is installed so as to horizontally surround the outer periphery of the winch frame 12, supports the cylindrical portion 15 of the stopper plate 13 in a slidable state in the axial direction, and is attached to the stopper plate 13. A reverse winding stopper 17 is provided to project at a position facing the rotation locus of the protrusion 14.

  As shown in a cross section in FIG. 3, the spring plunger 19 is provided in a cylindrical body with a pin 21 slidable in the axial direction, and is pressed by a spring 22 in the distal direction. Further, a screw portion 23 is provided on the outer periphery of the cylindrical main body, and a hexagon hole 24 for inserting a hexagon wrench is provided at the rear end portion.

  Such a spring plunger 19 is screwed onto a nut 20 attached to the stopper mounting frame 16 at a position facing the rear end surface of the shaft 2, and the rear end surface of the shaft 2 is directed toward the handle 1 at the tip of the pin 21. I try to press it. The pressing force by the pin 21 is adjusted by rotating the spring plunger 19 with a hexagon wrench inserted into the hexagon hole 24 and moving it in the axial direction.

  Next, the operation of this winch will be described. When raising the second and third telescopic struts 27 and 28, when the handle 1 is turned clockwise, the shaft 2 rotates clockwise and the male screw portion 5 of the shaft 2 and the female screw of the pinion gear 6 are screwed together. As a result, the pinion gear 6 moves toward the handle 1 side. When the pinion gear 6 moves in the direction of the handle 1, the slat plate 7, ratchet 8, and nylon washer 10 are pressed against the brake disc 11, and the shaft 2, pinion gear 6, slat plate 7, ratchet 8, nylon washer. 10. The brake disc 11 rotates as a unit, and the pinion gear 6 rotates the drum 18 counterclockwise to wind up the wire 25.

  At this time, since the pinion gear 6, the sash plate 7, and the ratchet 8 are pressed against the bushing 9, the stopper plate 13 is not attached to the stopper mounting frame 16 even if the end surface of the shaft 2 is pressed by the spring plunger 19. A predetermined interval is maintained during this period. Accordingly, even if the rotation of the handle 1 is continued, the protrusion 14 of the stopper plate 13 does not hit the reverse winding stopper 17 and the operation of raising the second and third telescopic struts 27 and 28 can be continued as it is.

  Further, when the second and third telescopic struts 27 and 28 are lowered, the pinion gear 6 rotates while pushing or loosening the support plate 7 toward the handle 1 during the lowering, so that the stopper plate 13 is A predetermined distance is maintained between the stopper mounting frame 16 and the protrusion 14 of the stopper plate 13 does not hit the reverse winding stopper 17 even if the handle 1 continues to rotate. The operation of lowering 28 can be continued.

  On the other hand, when the second and third telescopic struts 27 and 28 are completely lowered and the load of the wire 25 is eliminated, the pinion gear 6 is not subjected to the rotation from the drum 18. The pinion gear 6 moves in a direction away from the handle 1 by the male screw portion 5 with the rotation. Since the shaft 2 is pushed toward the stopper mounting frame 16 by the spring plunger 19, the stopper plate 13 approaches the stopper mounting frame 16. If the handle 1 is to be further rotated counterclockwise, the protrusion 14 is caught by the reverse winding stopper 17 and the shaft 2 cannot be rotated any more. As a result, reverse winding can be prevented.

  In the above-described embodiment, the description has been given of the case where the drum rotation axis is different from that of the shaft 2 and the drum 18 is rotated via the pinion gear 6. However, the present invention is not limited to this. 7 can also be applied to a winch of the type in which the shaft 2 directly connected to the handle 1 is used as the rotating shaft of the drum 18. In that case, a drum is mounted instead of the pinion gear 6 of FIG. 1, and a female screw corresponding to the male screw portion 5 is provided on the inner surface thereof.

It is a figure which shows the principal part of the winch of this invention. 1 is an overall view of a winch of the present invention. It is sectional drawing of a spring plunger. It is a figure which shows a light projector. It is explanatory drawing of expansion-contraction operation | movement of the expansion-contraction support | pillar of a projector. It is an exploded view of the conventional winch. It is a figure which shows the conventional winch reverse winding prevention mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Handle 2 ... Shaft 3,4 ... Lock nut 5 ... Male thread part 6 ... Pinion gear 7 ... Mass plate 8 ... Ratchet 9 ... Bushing 10 ... Nylon washer 11 ... Brake disk 12 ... Winch frame 13 ... Stopper plate 14 ... Projection 15 ... Cylinder part 16 ... Stopper mounting frame 17 ... Reverse winding stopper 18 ... Drum 19 ... Spring plunger 25 ... Wire

Claims (2)

A handle is fixed to one end, and by rotating the handle forward, a stopper plate having a protrusion protruding in the axial direction of the shaft is fixed to a shaft that rotates the wire winding drum, and the wire is wound from the drum. A winch characterized in that, when the handle is further rotated in the reverse direction after the return, the projection hits the reverse winding stopper to prevent the rotation. A shaft having a male screw part on a part of the outer periphery in the axial direction, a handle fixed to one end, and being rotatably attached to the winch frame via a bushing and movable in the axial direction; A spring plunger that axially presses an end surface opposite to the handle fixing side, a pinion gear that is rotatably mounted on the shaft and has a female screw portion that is screwed into the male screw portion on the inner surface, A drum that is rotated by the pinion gear to wind the wire when the handle rotates forward, a brake disk that is fixed between the bushing and the handle, and a protrusion that protrudes in the axial direction are provided on the outer peripheral portion. And a stopper plate fixed between the brake disc and the handle of the shaft, and a reverse winding provided at a position facing the protrusion. After rewinding the wire from the drum, the pinion gear moves in the anti-handle direction by screwing the male screw portion and the female screw portion. As a result, the shaft is pushed by the spring plunger so that the stopper plate moves in the direction of the handle, and the projection hits the reverse winding stopper to prevent rotation.

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