JP3299046B2 - Lever hoist - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to stabilize work such as pulling in and tightening of a load not only when the side surface of a main body cover is in contact with an operation surface, but also when the main body cover is used in contact with an operation surface. The present invention relates to a lever hoist which can be performed efficiently with a lever.

[0002]

2. Description of the Related Art In a conventional lever hoist in which an operating lever is made of an iron plate, a pair of lever covers forming an operating lever are formed by projecting an upper end portion in a longitudinal direction or both ends in a width direction at substantially the same position as a drive shaft. The protruding portion and the lower end of the operation lever have been firmly fastened by a plurality of fastening members such as screws and rivets.

[0003]

However, the operating levers are integrally fastened by a fastening member to the upper end side protruding portions of the pair of lever covers made of an iron plate or the widthwise opposite side protruding portions at substantially the same position as the drive shaft. In this case, when the operation lever is reciprocated while the side surface of the body cover that stores the load sheave is in contact with a horizontal or inclined operation surface,
The protrusion on the upper end side or the width direction of the operation lever protruding from the width direction of the main body cover comes into contact with the operation surface, and rotates the lever hoist in a direction perpendicular to the length direction of the operation lever.

When the protruding portion of the operation lever comes into contact with the operation surface, an extra force is required for the rotation of the operation lever thereafter, so that the pulling and tightening of the load can be performed smoothly and efficiently with a small force. become unable. Further, when the lever hoist is rotated with respect to the operation surface by the rotation of the operation lever, safety at the time of operation is impaired, so that a trouble such as an injury is often caused to the worker during the operation.

[0005] In addition, in the case of forming a protruding portion protruding from the main body cover on the upper end side or in the width direction of the lever cover, the structure of the operation lever becomes complicated, which not only increases the manufacturing cost but also increases the cost. The weight is reduced by the amount of the protruding portion that has been removed, and the handling becomes easy.

The present invention has been made in view of these circumstances, and the structure of the operation lever is simple, the manufacturing cost is low, and the operation lever is operated with the side of the body cover abutting on the operation surface. It is an object of the present invention to provide a lever hoist capable of efficiently pulling and tightening a load in a safe state when rotated.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and an operating lever is integrally formed by a plurality of screws, rivets and other fastening members above and below a pair of iron plate lever covers. The fastening member at the upper portion of the operation lever is located in a width direction between the drive shaft to which the pressing drive member is attached and the support shaft of the rotation direction switching claw, and at a position where the rotation of the rotation direction switching claw is not hindered. The lever hoist provided, wherein a shape of a side surface of the body cover is determined such that a peripheral portion on an upper end side of the operation lever does not protrude from a side surface of the body cover when the operation lever is rotated. Was invented.

[0008]

The upper fastening member is located in the middle width direction between the driving shaft and the support shaft of the rotation direction switching claw, and is provided at a position which does not hinder the rotation of the rotation direction switching claw. Fastening of the iron plate lever cover can be performed firmly without forming a protruding portion on the lever cover. The shape of the side surface of the main body cover is determined so that the peripheral portion on the upper end side of the operation lever does not protrude from the side surface of the main body cover when the operation lever is rotated. When the contact is made with the operation surface, it is possible to efficiently draw and tighten the load in a safe state.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. A load sheave (not shown) fixed to the drive shaft 2 is accommodated in the pair of body covers 1 and 1. The upper ends of the main body covers 1 and 1 are fastened by a pair of bolts 3 and 3 and nuts 4 and 4, and the lower ends are fastened by screw members 5 also serving as spacers and nuts 6 and 6 screwed to both ends. .

In the body covers 1, 1, a pressure-receiving member which constitutes a brake portion in the same manner as in the prior art, adjacent to the load sheave, and is externally inserted into the boss portion to lock the outer peripheral locking teeth with the ratchet pawls. And a pair of friction members disposed on both sides of the anti-reverse wheel and sandwiching the anti-reverse wheel.

Reference numeral 7 denotes a load chain whose upper end is wound around a load sheave. A lower hook 8 provided with a safety fitting 9 is connected to the lower end of the load chain. One end of the safety bracket 9 is rotatably attached to the base end of the lower hook 8.
The lower hook 8 is urged by an urging member in a direction of closing the opening of the lower hook 8 from the inside. For this reason, when the connecting member attached to the load is engaged with the lower hook 8 by rotating the safety metal fitting 9 inward, the load once engaged is removed by the safety metal fitting 9 closing the opening of the lower hook 8. 8 is prevented.

An upper hook 1 having a lower end locked to the main body cover 1, 1 is provided at an upper joint portion of the main body cover 1, 1.
0 is rotatably mounted. This hook 10
As in the case of the lower hook 8, a safety metal fitting 11 is attached to one end of the lower hook 8 and pivotally connected to the base end of the upper hook 10.

Below the load sheave, a buttoned member 12 having a protrusion toward the center of the load sheave is provided in the main body covers 1 and 1.

Reference numeral 13 denotes a pressing drive member (see FIGS. 4 and 5) screwed to one end of the drive shaft 2. An operation lever 14 surrounding the outer peripheral portion and extending toward the lower hook 8 is used to drive the drive shaft 2. The main body cover 1 is fitted into an opening of one adjacent main body cover 1 so that the main body cover 1 can rotate around the center.

The operating lever 14 comprises a pair of lever covers 14a and 14b made of an iron plate and a handle 14c attached to the lower end thereof. A pair of lever covers 14a, 14
The upper part b is fastened by fastening members 15 and 15, and the lower one part is fastened by a fastening member 16, respectively. Fastening member 1
As the members 5 and 16, screw members such as bolts and nuts, rivets and the like are used.

The pressing drive member 13 has a locking gear 13a formed at a constant pitch on an outer peripheral portion, and a rotation direction switching claw 17 is accommodated in an operation lever 14 below the locking gear 13a. The rotation direction switching claw 17 is rotatably held by the support shaft 18 with respect to the lever covers 14a and 14b.
Locking pawls 17a, 17a capable of engaging with the third locking gear 13a
Are formed.

A handle 19 for switching the rotation direction is attached to a portion of the support shaft 18 protruding outward from one lever cover 14b. The lower end of the rotation direction switching claw 17 is pressed upward by an urging member housed in the operation lever 14. For this reason, when the rotation direction switching claw 17 is switched by the handle 19 to each of the up, rewind, and neutral positions, the rotation direction switching claw 17 is held at each of those switching positions.

The upper end side of the operation lever 14 is the main body cover 1.
The shape and dimensions are determined so as not to protrude from the upper end periphery (see FIG. 2). The shape of the side surface 1a of the main body cover 1 is such that when the operation lever 14 is turned, the operation lever 14
Of the main body cover 1 so as not to protrude from the side surface 1a of the main body cover 1. Therefore, when the side surface 1a of the main body cover 1 is brought into contact with the horizontal or inclined operation surface 20, the operation lever 14 is turned by almost 180 degrees without rotating the lever hoist in the length direction of the drive shaft 2. Can be moved.

The fastening members 15, 15 for fastening the upper part of the operation lever 14 are provided between the drive shaft 2 on which the pressing drive member 13 is mounted and the support shaft 18 of the rotation direction switching claw 17 in the longitudinal direction of the operation lever 14. It is located in the middle width direction and is provided at a position that does not hinder the rotation of the rotation direction switching claw 17 about the support shaft 18.

In this embodiment, the operation lever 14 has a shape in which the outer sides of the upper fastening members 15 and 15 are slightly outwardly projected. This is because of the change. However, in this case, the overhang angle θ is preferably as small as possible in order to reduce the rotation angle of the operation lever 14 when the side surfaces 1a, 1a of the body covers 1, 1 abut on the operation surface 20.

Next, the operation of the apparatus will be described. Since the configuration of being housed in the main body covers 1 and 1 and the operation lever 14 is the same as that of the conventional lever hoist, when the operation lever 14 is reciprocated while holding the load on the lower hook 8. The load held by the lower hook 8 is turned up or turned back up according to the locked state of the rotation direction switching claw 17.

The side surfaces 1a, 1 of the body covers 1, 1
a in contact with the operating surface 20 that is horizontal or inclined,
When the operating lever 14 is reciprocated from a position substantially perpendicular to the operating surface 20, the operating lever 14 is rotated in a range where the hand of the worker holding the handle 14c does not abut on the operating surface 20. The angle is close to 180 degrees.

During this rotation, the peripheral portion 14d on the upper end side of the operation lever 14 protrudes outward from the side surfaces 1a, 1a of the main body covers 1, 1 and does not come into contact with the operation surface 20, so that it is positioned by the upper hook 10. Unlike the conventional case, the lever hoist is not rotated with respect to the operation surface 20 in the longitudinal direction of the drive shaft 2. For this reason, with the connecting member engaged with the lower hook 8, pulling and tightening of the load can be smoothly and efficiently performed with a small force in a safe state.

The operating lever 14 is provided with a fastening member 15,
Since the upper side and the lower side in the width direction are connected by 16, the pair of iron plate lever covers 14a and 14b are securely fastened.

Moreover, the upper fastening members 15, 15 are located between the drive shaft 2 and the support shaft 18 of the rotation direction switching claw 17 to eliminate or reduce the projecting portion of the operation lever 14 to the outside. Therefore, the operation lever 14 is
The structure is simpler than that of a conventional steel plate having a protruding portion protruding from the side surfaces 1a, 1a, the manufacturing cost is low, and the side surfaces 1a, 1a of the main body covers 1, 1 are connected to the operation surface. In addition, handling when the contact member 20 is in contact is also facilitated.

[0026]

According to the present invention, the following effects can be obtained.

[0027] In the lever hoist according to the first aspect, the fastening member above the operation lever is located between the drive shaft and the support shaft of the rotation direction switching claw so as not to hinder the rotation of the rotation direction switching claw. The shape of the side surface of the main body cover is determined so that when the operation lever is rotated, the peripheral portion on the upper end side of the operation lever does not protrude from the side surface of the main body cover. The structure can be simplified, the production cost can be reduced, and when the operation lever is rotated by bringing the side of the body cover into contact with the operation surface,
It is possible to efficiently draw and tighten a load in a safe state.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is an enlarged side view of an operation lever portion.

FIG. 4 is a right front view of FIG. 3 showing an engagement state between a rotation direction switching claw and a pressing drive member.

FIG. 5 is a right front view of FIG. 3 showing a state where the rotation direction switching claw is switched to a neutral position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body cover 1a Side surface side of main body cover 2 Drive shaft 13 Press drive member 14 Operation lever 14a Lever cover 14b Lever cover 14d Peripheral part on the upper end side of operation lever 15 Fastening member 16 Fastening member 17 Rotation direction switching claw 18 Support shaft 20 Operation surface

Claims (1)

(57) [Claims] An operating lever is formed integrally with a pair of iron plate lever covers on the upper and lower sides by a plurality of fastening members such as screws and rivets, and a fastening member above the operating lever is a drive shaft to which a pressing drive member is attached. And the rotation direction switching claw is positioned in a width direction intermediate between the rotation direction switching claw and the rotation direction switching claw, and the rotation direction switching claw is provided at a position where the rotation of the rotation direction switching claw is not hindered. A lever hoist characterized in that a peripheral portion on an upper end side of the operation lever does not protrude from a side surface of the main body cover.