JPH0719290U - Over-winding prevention device for manual winch - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the winch from being overwound inadvertently when operating the winch manually. [Structure] A lock member that rotates the drive shaft in a manual winch is converted into a displacement of a slider by a conversion mechanism, and a stopper mechanism is operated by the slider when the winding drum exceeds a winding stop position to rotate together with an input shaft. Is provided, and the rotation of the drive shaft is locked by the operation of the stopper mechanism.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an overwinding prevention device for a manual winch.

[0002]

[Prior art]

 For example, for a basket boat installed in a gymnasium, attach the board to a steel beam on the ceiling so that it can swing up and down, and rock the board upward so that it does not get in the way when doing other exercises such as volleyball. It is often used by swinging the board downwards when it is moved, but it is common to use a manual winch to move the board up and down.

Conventionally, in this type of manual winch, one end of a rope or a chain is connected to a board and the other end of the rope or the like is wound around a winding drum, and a manual operation, for example, a pulling operation of an annular chain is performed. In this system, the input shaft is rotated, the speed is reduced and transmitted to the drive shaft to drive the winding drum, and the rope is wound and unwound.

[0004]

[Problems to be solved by the device]

 By the way, when the basket board is actually moved up and down, it is necessary to repeatedly pull the annular chain, so that the operator tends to perform the chain operation without looking at the state of the basket board. When swinging the basket board downwards, if the board lowers to a predetermined position, the rope will only loosen even if the chain operation is performed thereafter.

However, when swinging the basket board upwards, if the chain is pulled and the rope or the like is excessively wound, the board hits the steel beam or the like and an excessive load acts on the board or winch. There is concern about board damage and winch failure.

In view of such problems, it is an object of the present invention to provide a manual winch overwinding preventive device capable of preventing the winch from being overwound due to carelessness when manually operating the winch. To do.

[0007]

[Means for achieving the object]

 In view of this, the manual winch overwinding prevention device according to the present invention is a manual winch in which the input shaft is manually rotated, and the input shaft is decelerated and output to the drive shaft to rotate the winding drum. A conversion mechanism that converts the rotation of the drive shaft into a displacement of the slider, a stopper mechanism that is operated by the slider when the winding drum exceeds the winding stop position, and a rotation of the drive shaft that is rotated together with the input shaft by the operation of the stopper mechanism. And a lock member for locking the lock.

The manual winch may be a method of rotating the input shaft by operating a handle, a method of rotating the input shaft by an annular chain and wheels shown in the following embodiments, or any other method as long as it is a manual type. The conversion mechanism may be of any type as long as it can convert the rotation of the drive shaft into the displacement of the slider.For example, the slider is screwed onto the lead screw rotated by the drive shaft, and the rotation of the slider is regulated by a guide to control the lead screw. The slider can be configured to advance and retract by rotation.

The stopper mechanism may be any mechanism that is actuated by a slider and locks the rotation of the drive shaft. For example, the displacement of the slider is magnified by a swing arm, and the stopper is retracted by the swing arm. Is good. The lock member can be configured by mounting a wheel having a claw portion that engages with the stopper concentrically with the input shaft.

[0010]

[Action and effect of the device]

 When the input shaft is manually rotated, the rotation is decelerated and transmitted to the drive shaft to rotate the winding drum. At that time, the rotation of the drive shaft is converted into the displacement of the slider by the conversion mechanism, and when the winding drum reaches the winding stop position and exceeds it, the stopper mechanism is activated by the slider and the rotation of the drive shaft is locked. It is locked by the member. As a result, the winding drum does not rotate beyond the stop position, and it is possible to reliably prevent the winch from being excessively wound.

[0011]

【Example】

 Hereinafter, the present invention will be described in detail with reference to specific examples shown in the accompanying drawings. 1 to 5 show an overwinding prevention device for a manual winch according to an embodiment of the present invention. In the figure, the manual winch is composed of a manual switch 10 and a winder 20. A reduction gear 101 is built in a case 100 of the manual switch 10, and the rotation of an input shaft 102 is, for example, 1/5. The speed is reduced to 0.73 and output to the output shaft (driving shaft) 103.

A chain wheel 104 is mounted on the tip of the input shaft 102 and is prevented from rotating by a key and a key groove. An annular chain (not shown) is mounted on the chain wheel 104. The input shaft 102 can be rotated manually.

Further, the input shaft 102 is provided with a braking mechanism for braking the input shaft 102 at an arbitrary rotational position of the chain wheel 104. In this braking mechanism, a slide cylinder 124 is spline-engaged with the outer peripheral surface of the input shaft 102 so as to be slidable in the axial direction, and a fixed cylinder 125 is fixed to the slide cylinder 124 and the fixed cylinder 125, respectively. The lining plates 106 are sandwiched between each other and are biased in the connecting direction by coil springs 107 and 108. Further, a mountain clutch 105 is formed between the front portion of the slide cylinder 124 of the input shaft 102 and the slide cylinder 124, and the mountain clutch 105 is biased by a coil spring 109 in the connecting direction.

On the other hand, in the winder 20, a rotating shaft 200 is rotatably supported in a case, a winding drum 201 is fixed to the rotating shaft 200 by welding, and an input is provided at an end of the rotating shaft 200. A sprocket 202 is attached. An output sprocket 110 is attached to the output shaft 103 of the manual switch 10, and the output sprocket 110 and the input sprocket 202 of the winder 20 are connected by a roller chain 111.

A reed screw 114 is rotatably supported on the upper part of the case 100 of the manual switch 10, and the rotation of the output shaft 103 is transmitted to the lead screw 114 by gears 112 and 113 meshing with each other. Has been done. A slider 115 is screwed onto the lead screw 114, and a slider lock 116 is rotatably mounted on the outer peripheral surface of the small-diameter step portion of the slider 115 and fixed with a screw. It is slidably linked to the guide 117 arranged on the lower side, and thus a conversion mechanism for converting the rotation of the output shaft 103 into the displacement of the slider 115 is configured.

A swing arm 118 is swingably provided by a mounting pin on the winding drum winding stop side of the lead screw 114, and a transmission piece 120 is arranged above and below the swing arm 118. It is provided slidably and is biased upward by a coil spring 122. An oval cooperation piece 119 is accommodated in the recess of the transmission piece 118, the cooperation piece 119 is slidably contacted with the lower inclined surface of the swing arm 118, and the stopper 123 is provided at the lower end of the transmission piece 118. Is mounted swingably with mounting pins. This mounting pin is provided above the swing arm 118, and the lower end of the swing arm 118 swings by expanding the displacement of the slider 115, thus winding the winding drum 201. A stopper mechanism that is operated by the slider 115 at the take-off position is configured.

A wheel 121 is fixed to the input shaft 102 concentrically with a screw, and a claw portion is formed on the outer peripheral surface of the wheel 121. In this way, the stopper 123 is engaged with the claw portion. A lock member for locking the input shaft 102.

For example, when the sliding winch of this example is installed on the basket board, first, the screw of the slider lock 116 is loosened and the annular chain is pulled to rotate the winding drum 201 further in the winding direction. Then, rotate the basket board until it hits the steel beam. When the slider 115 is rotated in that state, the slider 115 is screwed back and forth along the lead screw 114, so that the slider 115 is brought into contact with the swing arm 118 and the stopper 123 is engaged with the claw on the outer peripheral surface of the wheel 121. Then, the screw is moved back and forth until it locks, and the screw is tightened to lock the slider lock 116, and the adjustment is completed.

When swinging the basket board downward, when the annular chain is pulled in the opposite direction to the above adjustment, rotation is input from the chain wheel 104 to the input shaft 102, and the input shaft 102 is caused by the rotational force. The angular clutch 105 is displaced and the lining plate 106 of the braking mechanism is disengaged against the urging force of the coil springs 107 and 108, but the input shaft 102, the angular clutch 105, the slide cylinder 124, and the input shaft 102 of the input shaft 102 are separated. Since the path is connected, the rotation of the chain wheel 104 is transmitted to the output shaft 103 via the reduction gear 101, and further, through the output sprocket 110, the roller chain 111, the input sprocket 202, and the rotating shaft 200, the winding drum 201. To the basket board. The rope, etc. is unwound and the basket board can be swung downwards to set it in use.

If the pulling operation of the annular chain is stopped while the basket board is being swung downward, the rotational force will be lost, and the angular force of the coil springs 107, 108 will cause the angular clutch 105 to shift in position. Is canceled and the lining plate 106 of the braking mechanism is connected to brake the rotation of the input shaft 102, so that the winding drum 201 is stopped at that position and the basket board is held during the downward swing. .

On the other hand, when the basket board is swung upwards, if the annular chain is pulled in reverse, rotation in the opposite direction to that during downward swing is transmitted to the winding drum 201 through the same path as above. Then, the winding drum 201 winds a rope or the like, and the basket board is swung upward.

At that time, the rotation of the output shaft 103 is transmitted to the lead screw 117 via the gears 112 and 113, the lead screw 117 rotates, and the slider 115 is screwed in the direction of the arrow in FIG. As shown in FIGS. 2 and 3, the stopper 123 does not project downward until the slider 115 reaches the winding stop position of the winding drum 201, and when the slider 115 reaches the winding stop position, the stopper 123 of FIG. As shown in, the swing arm 118 is kicked by the slider 115 and swings, and the transmission piece 120 is pushed down via the linking piece 119. Then, since the part of the stopper 123 away from the mounting pin is in contact with the case, the stopper 123 swings around the mounting pin and projects downward, so that the stopper 123 engages with the claw of the rotating wheel 121. The wheel 121 is locked, and the rotation of the winding drum 201 is stopped. Therefore, the take-up drum 201 does not rotate beyond the stop position and can be reliably prevented from inadvertently overwinding the winch.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an overwinding prevention device for a manual winch according to an embodiment of the present invention.

FIG. 2 is a front cross-sectional configuration diagram showing a main part of the overwinding prevention device in a state before reaching a winding stop position.

FIG. 3 is a side cross-sectional configuration diagram showing a main part of the overwinding prevention device in a state before reaching a winding stop position.

FIG. 4 is a front cross-sectional configuration diagram showing a main part of the overwinding prevention device in a state in which the winding stop position is exceeded.

FIG. 5 is a side sectional configuration view showing a main part of the overwinding prevention device in a state in which the winding stop position is exceeded.

[Explanation of symbols]

 102 Input Shaft 103 Output Shaft (Drive Shaft) 114 Lead Screw (Conversion Mechanism) 115 Slider (Conversion Mechanism) 117 Guide (Conversion Mechanism) 118 Swing Arm (Stopper Mechanism) 123 Stopper (Stopper Mechanism) 121 Wheel (Lock Member)

Claims (2)

[Scope of utility model registration request] 1. A manual winch in which an input shaft 102 is manually rotated, and the input shaft 102 is decelerated and output to a drive shaft 103 to rotate a winding drum 201. A conversion mechanism for converting into a displacement of 115, a stopper mechanism which is operated by the slider 115 when the winding drum 201 exceeds the winding stop position, and a rotation mechanism which is rotated together with the input shaft 102 and is operated by the stopper mechanism. An overwinding prevention device for a manual winch, comprising: a lock member that locks the drive shaft 103. 2. The lead screw 114 rotated by the drive shaft 103, and the lead screw 11 in the conversion mechanism.
A slider 115 screwed to the four, and the slider 11
5 and a guide 117 for screwing the slider 115 forward and backward by the rotation of the lead screw 114. The stopper mechanism magnifies the displacement of the slider 115 by the swing arm 118 and the swing arm 118. The overwound of the manual winch according to claim 1, wherein the stopper 123 is a wheel 121 configured to be retracted and retracted, and the lock member is a wheel having a claw portion that is mounted concentrically with the input shaft 102 and engages with the stopper 123. Prevention device.