Winches with drum release structure

Abstract

A winch with a drum release structure includes a support frame comprising a base plate and two side plates, with an installation space formed between the side plates and the base plate. A drum shaft is disposed between the two side plates, and the drum is mounted on the drum shaft and can rotate relative to the support frame. A steel cable is coupled to and wound around the drum. A gear ring that can rotate with the drum is provided on one side of the drum. A drive shaft with a clutch drive structure is provided on the two side plates, and a drive gear opposite to the gear ring is provided on the drive shaft. The drum release structure includes a pull rod and an idler gear driven by the pull rod. The idler gear can move between a first position and a second position. In the first position, the idler gear meshes between the drive gear and the gear ring to form a transmission relationship. In the second position, the idler gear disengages from at least one of the drive gear and the gear ring to disengage the transmission relationship, thereby allowing the steel cable to be quickly released from the drum.

Claims

1. A winch having a drum release structure, comprising: A support frame includes a base plate and two side plates, the two side plates being disposed opposite to each other and joined to both sides of the base plate, forming an installation space between the two side plates and the base plate; a reel shaft is disposed between the two side plates; a drum is disposed on and supported by the reel shaft, the drum being rotatable relative to the support frame, a gear ring is provided on one side of the drum, the gear ring being rotatable with the drum relative to the support frame; a steel cable, the end of the steel cable near the drum being joined to the drum, and the steel cable being wound around the drum; A clutch drive structure includes a drive shaft and a drive gear. The drive shaft is rotatably mounted on the two side plates, and the drive gear is mounted on the drive shaft and located within the mounting space. The drive gear and the gear ring are spaced apart from each other and arranged opposite to each other. A drum release structure includes a pull rod and an idler gear. The idler gear is driven by the pull rod and can move between a first position and a second position. When the idler gear is in the first position, it engages with the drive gear and the gear ring, forming a transmission relationship between them. When the idler gear is in the second position, it disengages from at least one of the drive gear and the gear ring, releasing the transmission relationship between them.

2. The winch with a drum release structure as described in claim 1, wherein the two side plates respectively form corresponding side plate drive shaft holes, the drive shaft is rotatably inserted through the two side plate drive shaft holes, and the two ends of the drive shaft extend out of the two side plates and respectively form a throttle engagement portion.

3. The winch with a drum release structure as described in claim 1, wherein the two side plates respectively form corresponding outer tube holes; the drum release structure further includes an outer tube, a pin, and a pressure spring, the two ends of the outer tube respectively pass through the outer tube holes of the two side plates, so that the outer tube is arranged across the installation space, the outer tube forms at least one elongated hole, the pull rod is slidably inserted in the outer tube in a manner that allows it to slide along the axial direction of the outer tube, the pin is disposed on the pull rod and passes through the at least one elongated hole, and the pin protrudes from the outer circumferential surface of the outer tube, the idler gear is sleeved on the outer tube and can rotate relative to the bracket, the idler gear is driven by the pin and can move along the axial direction of the outer tube, the pressure spring is sleeved on the outer tube, and the pressure spring applies an elastic thrust to the idler gear, so that the idler gear is held in the first position, and when the pull rod is pulled, the idler gear is driven by the pin to move from the first position to the second position.

4. The winch with a drum release structure as described in claim 3, wherein the two ends of the outer tube are rotatably inserted through the outer tube holes of the two side plates, the idler gear is sleeved on the outer tube in a manner that is not rotatable relative to the outer tube but can slide along the axial direction of the outer tube, so that the idler gear can rotate with the outer tube relative to the support; the at least one elongated hole is a pair of elongated holes, the pair of elongated holes respectively penetrate the radially opposite sides of the outer tube, and the pair of elongated holes extend along the axial direction of the outer tube; the pull rod is provided with an inner rod, the inner rod is inserted through the outer tube in a manner that can slide along the axial direction of the outer tube, one end of the inner rod passes through one of the outer tube holes of the two side plates and forms a pull handle, the other end of the inner rod forms a pin hole, the pin passes through the pin hole, and the two ends of the pin respectively pass through the pair of elongated holes and protrude from the outer circumferential surface of the outer tube, and the two ends of the pin abut against one side of the idler gear along the axial direction of the outer tube.

5. The winch with a drum release structure as described in claim 3, wherein a convex ring is formed on the outer peripheral surface of the outer tube, the convex ring being located on the side of the idler gear away from the pin, and the two ends of the pressure spring abutting against the idler gear and the convex ring respectively.

6. A winch with a drum release structure as described in claim 1, wherein the winch includes a centrifugal braking device, the centrifugal braking device including a brake disc, at least one brake block, at least one return spring and a stop element, the brake disc being disposed on one side of the drum and rotatable with the drum, one side of the at least one brake block being pivotally connected to the brake disc, the at least one return spring being disposed between the brake disc and the at least one brake block and applying a return force to the at least one brake block, the stop element being disposed on the bracket and at least partially extending into the mounting space; when the rotational speed of the drum is greater than a predetermined rotational speed, the at least one brake block is subjected to centrifugal force to overcome the return force and pivots outward relative to the brake disc, causing one of the at least one brake block to engage with the stop element to limit the drum from continuing to rotate.

7. A winch with a drum release structure as claimed in claim 1, wherein the drive shaft forms a shoulder and an external thread is formed on the outer peripheral surface of the drive shaft; the drive gear has a threaded hole that engages with the external thread; the clutch drive structure includes a washer, at least one one-way ratchet ring, and a plurality of brake pads, the washer being fitted onto the drive shaft and abutting against the shoulder, the at least one one-way ratchet ring and the brake pads being fitted onto the drive shaft and located between the washer and the drive gear, the drive gear being rotatable relative to the drive shaft and moving toward the washer along the axial direction of the drive shaft to engage with the washer to clamp the at least one one-way ratchet ring and the brake pads, causing the at least one one-way ratchet ring and the drive gear to engage in frictional linkage.

8. The winch with a drum release structure as described in claim 7, wherein the clutch drive structure includes a drive rod and a driven rod, the drive rod being fixed to the drive shaft and located on the side of the drive gear away from the pad, and the drive rod extending radially outward from the drive shaft, the driven rod being fixed to the drive gear and protruding toward the drive rod, and the driven rod and the drive rod corresponding to each other along the axial direction of the drive shaft, such that the drive rod can push against the driven rod as the drive shaft rotates, and drive the drive gear to rotate via the driven rod.

9. A winch with a drum release structure as described in claim 7, wherein the winch includes a ratchet anti-reverse structure disposed on the bracket and capable of engaging the at least one one-way ratchet ring; when the idler gear is in the first position and the drive gear moves toward the pad and causes the at least one one-way ratchet ring to rub against the drive gear, the ratchet anti-reverse structure can restrict the at least one one-way ratchet ring from rotating in the direction corresponding to the release of the cable from the drum.

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