JPS638711Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a lever support device in a lever-type small hoisting and traction device used for hoisting or towing an object to be carried.

Conventionally, as a lever support device in a lever-type small hoisting and traction device, a fixed support ring 8 is formed on a brake cover 5 fixed to a frame 7 in the lever-type small hoisting and traction device, as shown in FIG. However, a lever support device has been proposed in which a rotary support ring 9 formed on the operating lever 2 is fitted into the fixed support ring 8 so as to be rotatable but not to move in the longitudinal direction of the drive shaft.

However, in the case of a lever support device with this structure,
When the operating lever 2 rotates back and forth, the fixed support ring 8 and the rotating support ring 9 rub against each other while constantly receiving the reaction force of the driving force from the operating lever 2. There is a drawback that the contact portion between the ring 8 and the rotation support ring 9 is worn out, causing wobbling.

As another lever support device, as shown in Fig. 2, there is a small lever-type hoisting and traction device configured to perform idling operation by loosening the brake (details of the operation can be found in Japanese Patent Publication No. 57-24320). (see publication), the operating lever 2 is moved to the drive member 10.
Also known is a lever support device that is rotatably fitted to the switching gear 11. In the case of the lever support device having this structure, the operating lever 2 is not supported by a fixed part but by the driving member 10, which is a rotating part, so that the main body of the lever-type small hoisting and traction device can be driven. When the shaft 1 is placed vertically on the floor or stand and idle operation is performed, the operating lever 2 is rotated together with the drive shaft 1 and the drive member 10, and the operating lever 2 is rotated by the operator or other person. The drawback is that there is a risk of bumping into objects.

The object of this invention is to provide a lever support device for a lever-type small hoisting and traction device that eliminates the above-mentioned drawbacks.

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

3 to 10 show an embodiment of this invention, in which the intermediate portion of a drive shaft 1 extending in the front-rear direction (left-right direction in FIG. 3) is supported by a frame 4 via a bearing 14. At the same time, the front end of the drive shaft 1 (the left end in FIG. 3) is supported by the gearbox 15 via a bearing 16, and is connected to a brake male thread 17 provided at the rear end of the drive shaft 1. is a drive member 19 having a switching gear 18
The driven member 20 is fitted with a female thread of 1 and is unrotatably fitted to the drive shaft 1 between the frame 4 and the drive member 19. is engaged with.

Between the driving member 19 and the driven member 20,
A braking pawl 21 and friction plates 22 abutted on both sides thereof are interposed, and a braking pawl piece 23 pivotally connected to the frame 4 is engaged with the braking pawl 21 by an engagement spring 24. A bearing 25 made of oil-impregnated sintered alloy is fitted into the hole of the braking ratchet 21, and the ratchet 21, friction plate 22, and bearing 25 are further fitted into the small diameter portion of the driven member 20 to form a brake section. has been done.

The driven member 20, the braking ratchet 21, and the friction plate 2
2. A fixed support having a U-shaped cross section and disposed at the rear of the metal plate brake cover 5 that covers the brake pawl piece 23 and the front part of the drive member 19 so as to face the front outer peripheral surface of the drive member 19. The ring 6 is bent and formed by press working, and the metal plate inner lever component 2
A rotary support ring is fitted to the base end of the drive shaft 1 in a portion facing the brake cover 5 so as to be rotatable on the inner circumferential side of the fixed support ring 6 and not to move in the longitudinal direction of the drive shaft 1. 3 is bent by press working so as to wrap around the fixed support ring 6 from its inner peripheral side, and a cylindrical spacer 27 having a female thread is fitted into the base end of the inner lever component 26. The metal plate outer lever component 28 and the inner lever component 26 are connected by a coupling bolt 29 screwed into the spacer 27, and the inner lever component 26 and the outer lever component The member 28 constitutes the operating lever 2.

A small clearance _D1 is provided between the rotation support ring 3 of the operating lever 2 and the outer peripheral surface of the drive member 19,
Further, a radial gap _D2 larger than the play _D1 is provided between the rotation support ring 3 and the fixed support ring 6 of the brake cover 5, and a small play is provided in the longitudinal direction of the drive shaft. Therefore, when the drive shaft 1 is oriented horizontally, the operating lever 2 is not supported by the fixed support ring 6 but is rotatably supported by the rotating member consisting of the drive member 19.

Brake male threaded portion 17 in the drive shaft 1
A support cylinder 30 having a cylindrical outer surface and a locking member 31 are sequentially and unmovably fitted into the rear part of the cylinder and fixed by a nut 32, and includes a locking member accommodating recess 33 and a locking flange 34. The boss of the quick-turning handle 35 is fitted into the support tube 30 so as to be rotatable and movable in the axial direction, and between the locking member 31 and the quick-turning handle 35 there is a boss with respect to the drive shaft 1. A brake release torsion spring 36 is arranged to rotate the handle 35 in the brake release direction.
The locking end portions bent at one end and the other end of the torsion spring 36 are locked to spring receivers provided on the locking member 31 and the speed rotation handle 35, and are further connected to the drive member 19 and the speed rotation handle 35. A connecting torsion spring 37 is disposed between the rotating handle 35, a locking end is bent at one end and the other end of the torsion spring 37, and the torsion spring 37 is connected in the longitudinal direction of the drive shaft. In the extended state, the locking ends at both ends of the torsion spring 37 are fitted into the locking holes 40, 41 of the spring receivers 38, 39 provided on the drive member 19 and the quick-turning handle 35. Then, the quick-turning handle 35 is pulled toward the drive member 19 by the torsion spring 37.

Two locking protrusions 42 are integrally provided on both sides of the front end of the quick-turning handle 35 in the diametrical direction, and a protrusion integrally provided on the front outer periphery of the support tube 30 has a brake over-relaxation prevention mechanism. A locking portion 43 for holding the brake tightening position, a locking portion 44 for holding the brake tightening position, and a stopper 45 for restricting rotation in the brake tightening direction are provided.

A front end portion of the brake cover 5 is fixed to the frame 4 with bolts, and is connected to the switching gear 1.
a claw piece for rotation in the winding direction which is detachably engaged with 8;
A switching pawl fitting 12 having a pawl piece for rotating in the lowering direction, an engaging part for holding the position in the hoisting direction, an engaging part for holding the position in the lowering direction, and an engaging part for holding the neutral position is rotatable on the operating lever 2. A handle 48 is fixedly fitted to a pivot 47 attached to the pivot 47, and a handle 48 is fixed to the pivot 47.
Further, a holding member 50 that is pressed by an engagement spring 49 is engaged with the switching claw metal fitting 12 .

The intermediate portion of the driven shaft 51 arranged parallel to the lower surface of the drive shaft 1 is connected to the gear box 15.
is penetrated by a steel plate frame 52 that closes the opening of the
The rear end of the driven shaft 51 is supported by the frame 4 via a bearing 54, and a load chain 55 is connected to the driven shaft 51 between the frames 4 and 52.
A load sheave 56 is integrally provided around which the load sheave 56 is wound, a large diameter driven gear 57 is fixed within the gear box 15, a pinion 58 provided at the front end of the drive shaft 1 is meshed with the large diameter driven gear 57, and The front end of the driven shaft 51 is supported by the gearbox 15 via a bearing 59.

A hook support fitting 61 to which the upper hook 60 is attached is disposed between the frames 4 and 52 and is attached by a support shaft 62.

Next, switching between idle rotation and non-idle rotation of the lever type small hoisting and traction device of the above embodiment will be explained.

8 to 10 show an idle rotation state, that is, a brake relaxed state, in which the fast rotation handle 35 is rotated in the brake relaxation direction with respect to the drive shaft 1 by the force of the brake relaxation torsion spring 36. Then, the locking protrusion 42 is engaged with the locking part 43 for preventing excessive loosening, and the handle 35 rotates the drive member 19 to the brake release position via the connecting torsion spring 37, so that the brake is relaxed. It is maintained in an idle state. Therefore, an idling operation can be performed by rotating the quick rotation handle 35 or by pulling the load chain 55.

The lever type small hoisting and traction device body is attached to the drive shaft 1.
When the control lever 2 is placed vertically on the floor or on a table and idle operation is performed by rotating the quick rotation handle 35 or pulling the load chain 55, the operating lever 2 is attached to the fixed support ring of the brake cover 5. 6 and remains stationary due to frictional force, the operating lever 2 does not rotate together with the drive shaft 1.

Next, when switching from the idling state shown in FIGS. 8 to 10 to the non-idling state shown in FIGS. When the drive member 19 is rotated in the brake tightening direction against the force, the drive member 19 is rotated in the brake tightening direction by the quick rotation handle 35 via the connecting torsion spring 37, and the brake is tightened. It will be done.

After the brake is tightened, the quick turning handle 3
If the rotation of step 5 is further continued, only the quick rotation handle 35 rotates in the brake tightening direction without rotating the drive member 19, so that the brake tightening force by the connecting torsion spring 37 increases. Subsequently, when the locking protrusion 42 on the fast-turning handle 35 engages with the stopper 45 for restricting rotation in the brake tightening direction, when the fast-turning handle 35 is moved forward, the locking protrusion 42 on the handle 35 stops tightening the brake. It is engaged with the position holding locking portion 44 and is held in a non-idling state, that is, in a brake activated state.

In the case of the above embodiment, the rotating member operation lever 2 consisting of the drive member 19 is rotatably fitted with a small clearance D ₁ , but the operation lever 2 has a small clearance relative to the quick rotation handle 35 . It may be rotatably fitted through the play gap _D1 .

Furthermore, this invention can be implemented in any lever-type small hoisting and traction device of the type that releases the brake during idle rotation or the type that does not release the brake but allows the drive shaft to freely rotate.

According to this invention, the operating lever 2 is rotated back and forth with the drive shaft 1 facing sideways, and the operating lever 2 rotates the drive shaft 1 via the claw metal fitting 12, the switching gear 18, and the drive member 19. In this case, the operating lever 2 is supported by a rotating member attached to the drive shaft 1, and the fixed support ring 6 and the rotating support ring 3
Since the reaction force of the driving force from the operating lever 2 is not received between the lever and the lever, the wear of those parts can be significantly reduced and durability can be improved. , drive shaft 1
When the control lever 2 is placed vertically on the floor or on a stand and is used for idling operation, the control lever 2 is placed on the fixed support ring 6 and a static force is generated due to friction, so the control lever 2 is placed on the drive shaft. Effects such as being able to prevent rotation together with 1 can be obtained.

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional side views showing a conventional lever-type small hoisting and traction device. Figures 3 to 10 show one embodiment of this invention, and Figure 3 is a longitudinal cross-sectional side view showing a non-idling state of a lever-type small hoisting and traction device having a lever support device of this invention. Figure 4 is a longitudinal side view showing an enlarged part of the lever, Fig. 5 is a longitudinal side view showing an enlarged part of the vicinity of the lever support part, and Fig. 6 is a locking protrusion when not rotating freely. FIG. 7 is a longitudinal sectional front view showing the position of the locking projection and the connecting torsion spring, and FIG. 7 is a developed cross-sectional view showing the position of the locking protrusion when not rotating freely. FIG. 8 is a longitudinal side view showing a part of the lever-type small hoisting and traction device during free rotation, and FIG. 9 is a longitudinal front view showing the position of the locking protrusion and the connecting torsion spring during free rotation.
FIG. 10 is a developed sectional view showing the position of the locking protrusion during free rotation. In the figure, 1 is a drive shaft, 2 is an operating lever, and 3 is a drive shaft.
1 is a rotating support ring, 4 is a frame, 5 is a brake cover, 6 is a fixed support ring, 12 is a switching pawl fitting, 15 is a gearbox, 17 is a male brake screw, 18 is a switching gear, 19 is a driving member, and 20 is a driven member. Part, 2
1 is a brake ratchet wheel, 22 is a friction plate, 23 is a brake pawl piece, 26 is an inner lever component, 28 is an outer lever component, 29 is a coupling bolt, 31 is a locking member, 35 is for fast rotation Handle, 36 is a torsion spring for loosening the brake, 37 is a torsion spring for connection, 42 is a locking protrusion, 43 is a locking part for preventing over-relaxation of the brake, 44 is a locking part for holding the brake tightening position, 45 is a brake tightening part. The stopper 56 for limiting rotation in the forward direction is a load sheave.

Claims (1)

[Scope of utility model registration request] Drive shaft 1 in lever type small hoisting and traction device
An operating lever 2 is rotatably fitted on the outer periphery of a rotating member attached to the frame ₄ with a play gap D1, and a rotating support ring 3 formed on the operating lever 2 is fixed to a frame 4. The fixed support ring 6 formed on the brake cover 5 is fitted so as to be rotatable and not move in the longitudinal direction of the drive shaft, and between the rotary support ring 3 and the fixed support ring 6. is the play gap
A lever support device in a lever-type small hoisting and traction device, characterized in that a radial gap D ₂ larger than D ₁ is provided.