JPS6313918B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lever-type small-sized hoisting and traction device used for hoisting or towing an object to be transported.

Conventionally, lever-type small hoisting and traction devices were
As shown in FIG. 1, a quick-turn handle 1 is attached to the drive shaft 7 between a drive member 8 screwed onto the drive shaft 7 and a stopper 9 fixed to the rear end of the drive shaft 7. is fitted to be rotatable and movable in the longitudinal direction of the drive shaft between a non-idling position and an idling position,
The drive member 8 and the fast-turning handle 1 are provided with an engaging portion for transmitting rotational force, and the stopper 9 is provided with a stop protrusion 10 of the fast-turning handle 1 during non-idling rotation.
A locking surface 11 for preventing the handle from retreating facing the handle and a recess for allowing the handle to retreat for accommodating the stopping protrusion 10 during free rotation are provided, and a fixed support ring 14 is formed on the brake cover 13 fixed to the frame 4. , a structure in which a rotary support ring 15 formed on the operating lever 2 is rotatably fitted into a fixed support ring 14 has been proposed.

However, in the case of a lever-type small hoisting and traction device with this structure, when the operating lever 2 rotates back and forth, the rotation support ring 15 of the operating lever 2 and the brake cover 1
Since the fixed support ring 14 of No. 3 is constantly in sliding contact with each other, the resistance to the lever operation force increases, and when used for a long period of time, the fixed support ring 14 and the rotating support ring 15
The disadvantage is that the contact portions of the connectors are worn out, causing looseness.

In addition, when the operating lever is rotatably fitted into a rotating member such as a drive member screwed onto the external brake thread of the drive shaft or a quick-turning handle, the operating lever is not supported by the fixed part and rotates. Since it is supported by the movable member and rotates together with the rotary member, there is no resistance of the fixed portion to the lever operating force, which has the advantage that the operating force of the operating lever is small. However, on the other hand, during idling operation, the rotating member may be pressed down by the weight of the operating lever and the parts attached to it, resulting in increased idling operation resistance, or the rotating part and the operating lever may There are disadvantages such as being passed around.

The object of the present invention is to provide a lever-type compact hoisting and traction device which eliminates the above-mentioned drawbacks.

Next, the present invention will be explained in detail using illustrated examples.

Figures 2 to 8 show an embodiment of the present invention, in the front-rear direction (left-right direction in Figure 2).
An intermediate portion of the drive shaft 7 extending to the front end is supported by the frame 4 via a bearing 16, and a front end portion (the left end in FIG. 2) of the drive shaft 7 is supported by a gearbox 17 via a bearing 18. Brake male screw 1 provided on the rear end side of the drive shaft 7
The female thread of the drive member 8 having the switching gear 20 is screwed into the drive member 9 , and the driven member 21 , which is unrotatably fitted to the drive shaft 7 between the frame 4 and the drive member 8 , is connected to the drive shaft 7 . The large diameter portion supported by the bearing 16 is engaged with the large diameter portion.

A braking pawl 22 and friction plates 23 abutted on both sides are interposed between the driving member 8 and the driven member 21, and a braking pawl 24 pivotally attached to the frame 4 is used for engagement. A bearing 26 made of an oil-impregnated sintered alloy is engaged with the braking ratchet 22 by a spring 25, and a bearing 26 made of oil-impregnated sintered alloy is fitted into a hole of the braking ratchet 22, and the ratchet 22, friction plate 23, and bearing 26 are driven members. 2
A brake portion is formed by fitting into the small diameter portion of No. 1.

A boss of the quick-turning handle 1, in which a stopper 9 is unrotatably fitted to a small-diameter shaft portion provided at the rear end of the drive shaft 7 and fixed by a nut 27, and is provided with a recess 28 for accommodating the stopper. is fitted onto the drive shaft 7 between the drive member 8 and the stopper 9 so as to be rotatable and slidable in the axial direction, and further includes an engagement hole 29 at the rear of the drive member 8,
An engagement protrusion 30 that is fitted into the engagement hole 29 is integrally protruded from the front portion of the handle 1, and the engagement hole 29 and the engagement protrusion 30 constitute an engagement portion for transmitting rotational force. has been done.

The handle 1 is integrally provided with a plurality of stop protrusions 10 at equal intervals in the handle circumferential direction at the inner part of the stopper accommodating recess 28, and the stopper 9
is provided with a locking surface 11 for preventing the handle from retreating, which is arranged in contact with or in close proximity to the rear surface of the stopping protrusion 10 of the handle 1 when the handle 1 is not idling, and the handle accommodating the stopping protrusion 10 when it is idling. Retraction allowance recess 12
is provided, and furthermore, in the front part of the stopper 9,
A locking surface 31 for preventing excessive loosening of the brake is provided opposite to one side of the stopping projection 10, and a locking surface 31 is provided between the other side of the stopping projection 10 and the front side surface 32 of the stopper 9 facing thereto. A space is provided to allow rotation of the handle 1 to tighten the brake.

An outer circumferential portion of a handle locking annular spring 33 made of a partially cut-out annular metal spring or a rubber ring is fitted into an annular groove provided in a drive shaft fitting portion of the handle 1, and the drive shaft The handle fitting portion 7 includes an annular locking groove 34 for stopping the idle rotation position of the handle, which is separably fitted to the inner periphery of the spring 33, and a handle locking groove 34, which is separably fitted to the inner periphery of the spring 33. An annular locking groove 35 for stopping displacement is provided.

The driven member 21, the braking ratchet 22, and the friction plate 2
3. A fixed support having a U-shaped cross section and disposed at the rear of the metal plate brake cover 13 that covers the braking claw piece 24 and the front part of the drive member 8 so as to face the front outer peripheral surface of the drive member 8. The ring 5 is bent and formed by press working, and an inner lever component 36 made of a metal plate is formed.
At the base end of the brake cover 13, there is an idle support rotation which is fitted into the inner circumferential side of the fixed support ring 5 so as to be rotatable and not move in the longitudinal direction of the drive shaft 7. The dynamic support ring 6 is bent and formed by press working so as to wrap around the fixed support ring 5 from its inner circumferential side with a play gap, and a cylinder having a female thread is provided at the base end of the inner lever component 36. The shaped spacer 37 is fitted and fixed by caulking, and the metal plate outer lever component 38
has a small play on the cylindrical outer surface of the handle 2.
The rotating support ring 3 for non-idling support, which is fitted through D ₁ , is bent and formed by press working. Further, the outer lever constituent member 38 and the inner lever constituent member 36 are coupled by a coupling bolt 39 screwed into the spacer 37, and the operating lever 2 is constituted by the inner lever constituent member 36 and the outer lever constituent member 38. A radial gap D ₂ larger than the play D ₁ is provided between the fixed support ring 5 and the rotation support ring 6 for supporting during idle rotation, and the rotation support ring 6 and A radial gap D ₃ larger than the gap D ₂ is provided between the drive member 8 and the drive member 8 .

The front end of the brake cover 13 is attached to the frame 4.
a claw piece for rotation in the hoisting direction, a claw piece for rotation in the hoisting direction, and an engagement for holding the position in the hoisting direction, which are fixed by bolts (not shown) and removably engaged with the switching gear 20. The switching pawl fitting 40, which has an engaging part for holding the lowering direction position and an engaging part for holding the neutral position, is fitted and fixed to a pivot shaft 41 that is rotatably attached to the operating lever 2, and is fixed to the pivot shaft 41. A switching handle 42 is fixed, and a holding member 44 pressed by an engagement spring 43 is engaged with the switching claw metal fitting 40.

A middle portion of a driven shaft 45 disposed below and parallel to the drive shaft 7 is connected to a gear box 17.
The rear end of the driven shaft 45 is supported by the frame 4 through a bearing 48, and a load is applied to the driven shaft 45 between the frames 4 and 46. A load sheave 50 around which the chain 49 is wound is integrally provided, and a large-diameter driven gear 51 is fixed within the gearbox 17, and the drive shaft 7
A pinion 52 provided at the front end of is meshed with a large-diameter driven gear 51.

A hook support fitting 54 to which the upper hook 53 is attached is disposed between the frames 4 and 46 and is attached by a support shaft 55.

In the lever-type small hoisting and traction device of the above embodiment, while the drive shaft 7 is held so as not to rotate by pressing the load chain 49 or by other means, grip the quick-turning handle 1 and hold it together with the drive shaft 7. After rotating the drive member 8 in the brake release direction and moving the stopping protrusion 10 of the handle 1 from the locking surface for preventing handle retraction of the stopper 9 to a position opposite to the recess 12 for allowing handle retraction, the handle By performing a simple operation of moving the handle 1 backward, the brake part can be held in an idle state and the quick turning handle 1 can be moved back.
The handle 1 can be rotated or rotated by pulling the load chain 49, and the stop protrusion 10 can be moved forward into the recess 12 by moving the handle 1 forward.
By rotating the handle 1 in the direction of tightening the brake, the brake part can be switched from an idle state to an activated state, thereby preventing the lifting and unloading of light loads. Furthermore, when switching from the idling state to the non-idling position, that is, the driveable state, there is a
Since the locking surface 11 for preventing the handle from retreating in the stopper 9 fixed to the rear end of the drive shaft 7 is arranged,
It is possible to eliminate the possibility of switching to an idle state due to erroneous operation during hoisting or unwinding operation.

According to the present invention, the lever-type small hoisting device has an idling device configured to switch to an idling state by moving the speed rotation handle 1 from a non-idling position to an idling position in the longitudinal direction of the drive shaft. In the traction device, a control lever 2 for rotating the drive shaft is provided with a lock that is rotatably fitted into the handle 1 with a play gap D ₁ only when the handle 1 for quick rotation is moved to the non-idling position. A rotary support ring 3 for supporting during idle rotation and a rotary support ring 6 for supporting during idle rotation rotatably fitted to a fixed support ring 5 fixed to the frame 4 are provided. The play between the support ring 5 and the rotation support ring 6
Since a radial gap D2 larger than _D1 is provided, the quick rotation handle ₁ can be moved to the non-idling position, and the operating lever 2 can be rotated back and forth to hoist, lower, or tow and transport the load. In this case, the operating lever 2 is supported by the quick-turning handle 1 that rotates together with it and is not supported by the fixed support ring 5 and the rotating support ring 6, so the fixed support ring 5 and the rotating support ring 6 are do not rub against each other with a relatively large contact pressure, and therefore no relatively large resistance is applied to the operating lever 2. Therefore, the operating lever 2 can be smoothly rotated back and forth, and the fixed support ring 5 and the rotation support ring 6 to improve durability, and when the operating lever 2 is moved to the free rotation position to perform the free rotation operation, the operation lever 2 is used for fast rotation. It is not supported by the handle but is supported only by the fixed support ring 5 and the rotating support ring 6 for supporting during free rotation, so that the operating lever 2 and the parts attached thereto are not supported by the rotating member during free rotation. Since no pressing force is applied due to the weight of the lever, idling operation can be performed with a small operating force, and there is no fear that the operating lever 2 will be rotated along with the rotating part during idling operation. is obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing an example of a conventional lever-type small hoisting and traction device. Figures 2 to 8
The drawings show an embodiment of the present invention, in which Fig. 2 is a longitudinal cross-sectional side view of the lever-type small hoisting and traction device when it is not idling, and Fig. 3 is a longitudinal cross-sectional view showing an enlarged part of the device. A side view, FIG. 4 is an enlarged longitudinal sectional side view showing the relationship between the rotating support ring, fixed support ring, and rotating member in the operation lever, and FIG. 5 is a quick-turning handle when not rotating freely and the handle housed inside it. Figure 6 is a developed cross-sectional view showing the relationship between the quick rotation handle and the stopper, and Figure 7 is a vertical cross-sectional side view showing part of the small lever-type hoisting and traction device during free rotation. FIG. 8 is a front view showing the quick rotation handle and the portion housed inside the handle during free rotation. In the figure, 1 is a handle for quick rotation, 2 is an operating lever, 3 is a rotating support ring for support during non-idling, 4 is a frame, 5 is a fixed support ring, 6 is a rotating support ring for supporting during idling, 7 is a drive shaft, 8 is a drive member, 9 is a stopper,
13 is the brake cover, 17 is the gearbox, 1
9 is a brake male screw, 20 is a switching gear, 21 is a driven member, 22 is a brake pawl, 23 is a friction plate, 2
4 is a brake claw piece, 29 is an engagement hole, 30 is an engagement protrusion, 31 is a locking surface for preventing the brake from loosening too much, 33
34 is an annular locking groove for stopping the handle in an idling position; 35 is an annular locking groove for stopping the handle in a non-idling position; 36 is an inner lever component; 38 is an outer lever structure made of a metal plate. Member: 40 is a switching claw metal fitting; 4
5 is a driven shaft, 49 is a load chain, and 50 is a load sheave.

Claims (1)

[Claims] 1 In a lever-type small hoisting and traction device having an idling device configured to switch to an idling state by moving the speed rotation handle 1 from a non-idling position to an idling position in the longitudinal direction of the drive shaft, A support lever for non-idling operation that is rotatably fitted into the handle 1 for quick rotation via a clearance D ₁ only when the handle 1 for quick rotation is moved to the non-idling position is attached to the operating lever 2 for shaft rotation operation. A rotary support ring 3 and a rotary support ring 6 for supporting during idle rotation are rotatably fitted to a fixed support ring 5 fixed to the frame 4, and the fixed support ring 5 and A small lever-type hoisting and traction device characterized in that a radial gap _D2 larger than the play D1 is provided between the dynamic support ring ₆ and the dynamic support ring 6.