JPS6312158Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a lever-type small-sized hoisting and traction device that performs hoisting or towing and transportation by repeatedly swinging a lever.

Conventionally, as a lever support device for a lever-type small hoisting and traction device, a boss is fitted into an opening provided on the side of a metal plate brake cover and fixed by welding. A structure is known in which a cylindrical shaft portion cut and formed is rotatably fitted into the boss, and a retaining snap ring is fitted into a groove on the outer periphery of the tip of the cylindrical shaft portion.

However, the conventional lever support device has a disadvantage that it has a complicated structure, requires welding and cutting, and is expensive.

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

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

1 to 4 show a first embodiment of this invention, in which an intermediate portion of a drive shaft 5 is supported by a frame 6 via a bearing 7, and one end portion of the drive shaft 5 is supported by a frame 6 via a bearing 7. Bearing 9 by gearbox 8
A switching gear 11 is attached to a male brake thread 10 supported through the brake shaft and provided at the other end of the drive shaft 5.
The driven member 13, which is fitted onto the drive shaft 5 between the frame 6 and the drive member 12 in a non-rotatable manner, is supported by the bearing 7 on the drive shaft 5. It is engaged with the large diameter part.

Between the driving member 12 and the driven member 13,
A braking pawl 14 and a friction plate 15 in contact with both sides thereof are interposed, and a braking pawl 16 pivotally connected to the frame 6 is engaged with the braking pawl 14 by an engagement spring 17. A bearing 18 made of oil-impregnated sintered alloy is fitted into the hole of the braking ratchet 14, and the ratchet 14, friction plate 15, and bearing 18 are further fitted into the small diameter portion of the driven member 13 to form a brake section. has been done. Further, between the driving member 12 and the driven member 13, there is an elastic resistance member 19 made of a coil spring that acts to resist movement in the tightening direction when the driving member 12 is about to move in the tightening direction. It is mediated.

The driven member 13, the braking ratchet 14, and the friction plate 1
5. One side of the metal plate brake cover 1 that covers the brake claw piece 16 and one side of the drive member 12 is composed of a cylindrical part and an inward flange connected to the tip of the cylindrical part. The fixed support ring 2 is bent and formed by press working, and the base end of the inner lever component 3A made of a metal plate has a U that opens outward.
A rotary support ring 4 having a letter-shaped cross section is bent and formed by press working, and the rotary support ring 4 is disposed close to the outer circumferential surface of the intermediate portion of the drive member 12 .

The inward flange of the fixed support ring 2 is disposed within the rotary support ring 4, and a large number of bearing balls 41 are fitted into the annular space formed by the fixed support ring 2 and the rotary support ring 4. A cylindrical spacer 20 having a female thread is fitted into the base end of the inner lever component 3A and fixed by caulking, and the outer lever component 3B made of metal plate and the inner lever component 3A are connected to the inner lever component 3A. Spacer 20
are connected by a connecting bolt 21 screwed into the
The operating lever 3 is constituted by the inner lever constituent member 3A and the outer lever constituent member 3B.

The other side of the brake cover 1 is fixed to the frame 6 with bolts (not shown),
and a pawl piece 45 for rotation in the hoisting direction and a pawl piece 4 for rotation in the hoisting direction, which are removably engaged with the switching gear 11.
6. The switching pawl fitting 22, which has an engaging part 47 for holding a position in the winding direction, an engaging part 48 for holding a position in the lowering direction, and an engaging part 49 for holding a neutral position, is rotatably attached to the operating lever 3. The handle 23 is fitted onto and fixed to a pivot shaft 24 which has a handle 23 attached thereto.

A groove-shaped support fitting 50 is disposed within the inner lever component 3A and fixed by spot welding 51, and an engagement spring 26 is disposed within the support fitting 50.
The holding member 25 is detachably engaged with the winding direction position holding engaging part 47, the winding down direction position holding engaging part 48, and the neutral position holding engaging part 49.
is provided so that it can move forward and backward toward the switching claw metal fitting 22.

One end of a driven shaft 27 disposed below and parallel to the drive shaft 5 is supported by a gear box 8 via a bearing 28, and the driven shaft 27
The other end is supported by the frame 6 via a bearing 29, and a cover plate 3 is provided at the opening of the gearbox 8.
Further, a load sheave 32 for winding a load chain 31 between the frame 6 and the cover plate 30 is integrally provided on the driven shaft 27, and a large-diameter driven gear 33 is fitted in the gear box 8. A fixed pinion 34 provided at one end of the drive shaft 5 is meshed with a large-diameter driven gear 33 .

A small diameter shaft portion 3 connected to the other end of the drive shaft 5
5, the manual speed rotation handle 36 is fitted, and the handle fixing nut 37 is screwed into the nut 3.
7 is fixed to the small diameter shaft portion 35 by a split pin or other locking means, and an engagement groove 38 provided at the outer end of the drive member 12 has an engagement groove provided at the inner end of the handle 36. A protrusion 39 is fitted.

When there is no load, the brake part is relaxed by the elastic resistance member 19, so the switching pawl fitting 2
2 to the neutral position to remove both the forward rotation pawl piece and the reverse rotation pawl piece from the switching gear 11, and then grip and rotate the handle 36 to rotate the drive shaft 5 and the drive member 12. By rotating the load sheave 32, the position of the load chain 31 can be quickly adjusted.

FIG. 5 shows a second embodiment of this invention, in which the brake cover 1 has a U opening facing outward.
A fixed support ring 2 with a letter-shaped cross section is bent and formed by press working, and is attached to the base end of the inner lever component 3A.
A rotating support ring 4 consisting of a cylindrical portion and an inward flange connected to the tip of the cylindrical portion is bent by press working, and an annular shape constituted by the fixed support ring 2 and the rotating support ring 4 is formed. Although a large number of bearing balls 41 are fitted into the space, the other configurations are the same as in the first embodiment.

In FIG. 1, reference numeral 42 denotes an upper hook support fitting disposed between the frame 6 and gearbox 8 and attached by a support rod 43, and 44 denotes an upper hook latched to the upper hook support fitting 42.

According to this invention, a fixed support ring 2 is bent on the side of a metal plate brake cover 1 in a lever-type small hoisting and traction device, and is rotated on the side of the base end of a metal plate operation lever 3. Since the support ring 4 is bent and a large number of bearing balls 41 are fitted into the annular space formed by the fixed support ring 2 and the rotating support ring 4, the boss can be attached to the brake cover by welding, The brake cover can be easily attached to the operating lever 3 without performing complicated processing such as cutting a cylindrical shaft part on the operating lever or cutting a groove for fitting a snap spring into the cylindrical shaft part. In particular, in the case of this invention, the fixed support ring 2 provided on the brake cover 1 and the base of the operating lever 3 Since the bearing ball 41 is interposed between the rotation support ring 4 provided at the end, effects such as the ability to easily rotate the operating lever 3 with a small force can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional side view showing a part of a small lever-type hoisting and traction device having a lever support device according to a first embodiment of the invention, and FIG. 2 is a view of the vicinity of the brake part and lever support device in FIG. 1. FIG. 3 is a vertical sectional side view showing an enlarged view of the drive unit using the operating lever in FIG. 1, and FIG.
5 is a sectional view taken along the line A--A in the figure, and FIG. 5 is a longitudinal sectional side view showing the lever support device and the vicinity of the brake section according to the second embodiment of the invention. In the figure, 1 is a metal plate brake cover, 2
3 is a fixed support ring, 3 is a metal plate operating lever, 3A is a metal plate inner lever component, 3B is a metal plate outer lever component, 4 is a rotating support ring, 5 is a drive shaft, 6 is a frame, 8 1 is a gearbox, 10 is a male brake screw, 11 is a switching gear, 12 is a driving member, 13 is a driven member, 14 is a braking ratchet, 15 is a friction plate, 16 is a braking pawl, 19 is an elastic resistance member, 20 is a spacer, 21 is a coupling bolt, 22
31 is a load chain, 32 is a load sheave, and 36 is a manual speed rotation handle.

Claims (1)

[Scope of utility model registration request] A fixed support ring 2 is bent and formed on the side of a metal plate brake cover 1 in a lever-type small hoisting and traction device, and a rotation support ring 4 is bent and formed on the side of the base end of a metal plate operation lever 3. and said fixed support ring 2
A small lever-type hoisting and traction device characterized in that a large number of bearing balls 41 are fitted into an annular space formed by a rotary support ring 4 and a rotary support ring 4.