JPH07252092A - Lever hoist - Google Patents

Abstract

PURPOSE:To prevent any rainwater and dust from penetrating into a pair of side plates, and besives, there is less in the number of part items, simple in structure and capable of making assembling cost be yet more inexpensive. CONSTITUTION:In a pair of side plates 3 and 4, two chain guides 3 and 4a preventing any separation of a load chain 19 are integrally made up in their inner surfaces, and an engaged recess to be fitted in an engaged shank of the lower end of an upper hook 26 is installed in a joined surface where this upper hook 26 is pierced through. In addition, these paired side plates 3 and 4 are closed of the peripheral part at both upper and flank sides of a load heave 2 and simultaneously each joined part of these side plates 3 and 4 is clamped by a screw member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lever hoist which has a simple structure, is easy to assemble, and prevents rainwater and dust from entering the load sheave and the chain guide.

[0002]

2. Description of the Related Art In a conventional lever hoist in which a load sheave formed at one end of a drive shaft is rotated by an operating lever in a hoisting and a hoisting direction, a load sheave, a chain guide, and an upper hook are It was held by a plurality of stay bolts in a state of being set between a pair of flat side plates. Moreover, the chain cover that covers the outer peripheral portion of the load sheave and the pair of chain guides that prevent the load chain from coming off are both formed separately from the pair of side plates, and the upper hook is formed in the through hole of the lower end connecting member. It was connected with the upper part of a pair of side plates by the screw member inserted.

[0003]

However, the chain cover and the pair of chain guides are formed separately from the side plates and held between the side plates, or the lower end connecting member of the upper hook is connected to the pair of side plates by a screw member. In such a case, the number of parts is increased and the structure is complicated, and it takes a lot of time and time to assemble, resulting in poor work efficiency and a high assembly cost. Further, when the pair of side plates are formed in a flat plate shape, it is not possible to prevent rainwater and dust from entering the pair of side plates from the peripheral portion of the side plates, so that the load sheave set between the side plates, The chain guide and the upper hook had a shorter period in which they could operate smoothly.

The present invention has been made in view of these circumstances, and has a small number of parts, a simple structure, can be assembled at a low cost, and prevents rainwater and dust from entering the pair of side plates. The purpose is to provide a lever hoist.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and a load sheave and a chain guide are sandwiched by a pair of side plates and fixed by a screw member, and projected from one side plate. In a lever hoist in which a brake portion and a driving portion are screwed to a driving shaft and an operating lever is engaged with the driving portion, each side plate has a chain guide press-formed on its inner surface to prevent the load chain from coming off. It is integrally formed with the load sheave, and is closed on the upper and lateral peripheral portions of the load sheave by polymerization.Furthermore, each side plate is fixed to the overlapped portion with a screw member, and the upper hook is attached to the joint surface through which the upper hook penetrates. An inventor of a lever hoist having an engaging recess formed therein, which engages with an engaging shaft provided at a lower end of the hook.

In order to assemble the lever hoist efficiently, it is sufficient to form a positioning engaging concave-convex portion integrally with the pair of side plates on their joint surfaces by press molding or the like. .

[0007]

In each side plate, the chain guide is integrally formed on the inner surface thereof, and the engaging surface through which the upper hook penetrates is provided with the engaging recess for engaging with the engaging shaft portion at the lower end of the upper hook. Therefore, the number of parts of the lever hoist is reduced and the structure is simplified. If the structure is simple, the work efficiency at the time of assembling the lever hoist is improved, and the assembling cost is low. In addition, since each side plate is configured to close the upper and side peripheral parts, when both side plates are fixed with screw members, rainwater and dust will not be caught in the pair of side plates on which the load sheave etc. are set. It will not invade.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the figure, reference numeral 2 denotes a load sheave formed at one end of a drive shaft 1, and the load sheave 2 has bearings 5 mounted on a pair of side plates 3 and 4 in which shaft portions 2a on both sides thereof are arranged in parallel. , 5 hold them rotatably.

On the drive shaft 1 projecting from one side plate 3, the first screw portion 1a, the spline portion 1b, and the second screw portion 1c are arranged in this order from the side closer to the side plate 3 via an intermediate shaft portion having a small diameter. Is formed. The first screw portion 1a and the second screw portion 1c are both right-hand threads, and the outer diameter is such that the first screw portion 1a is larger than the second screw portion 1c and the spline portion 1b has an intermediate dimension therebetween. .

A pressure receiving member 6 is fixed to the first screw portion 1a of the drive shaft 1 by screwing at a position where it contacts the shaft portion 2a of the load sheave 2 protruding from the side plate 3. The pressure receiving member 6 is formed of a disc portion 6a on the side plate 3 side and a boss portion 6b that axially protrudes from the center portion thereof. The boss portion 6b of the pressure receiving member 6 has a pair of friction members 7 and 8. When,
A reverse rotation prevention wheel 9 sandwiched between these is externally inserted.

In the first screw portion 1a of the drive shaft 1, in addition to the pressure receiving member 6 which constitutes the brake portion together with the friction members 7 and 8 and the reverse rotation preventing wheel 9, the intermediate portion of the outer peripheral surface is adjacent to the pressure receiving member 6. The pressing drive member 10 provided with the locking gear 10a is screwed to the shaft so that it can be moved back and forth in the axial direction. The pressing drive member 10, which is the main body of the drive unit, includes the boss portion 6 of the pressure receiving member 6.
A plurality of, for example, three arc-shaped convex portions 10b arranged on the same circumference are formed on the end surface on the b side, and the arc-shaped convex portions 10b are provided outside the arc-shaped convex portions 10b along the circumference. An annular groove 10c is formed.

Reference numeral 11 denotes a push ring externally inserted into the three arc-shaped convex portions 10b of the pressing drive member 10. The push wheel 11 is pressed and locked at the inner surface of the arc-shaped convex portion 10b at one end. At the same time, the other end can be moved back and forth along the drive shaft 1 integrally with the pressing drive member 10 by the holding spring 12 which is locked to the rear surface side of the push wheel 11 (the end surface side of the pressing drive member 10). ing.

The pressing drive member 10 has a ring-shaped groove 10c formed on the end face side facing the push wheel 11, and a packing 13 having a circular cross section is fitted therein, and the back side of the push wheel 11 is in contact with the packing 13. ing. Reference numeral 14 denotes a pressing spring. The spring 14 includes a circular recess formed on the end surface of the pressure receiving member 6 on the boss portion 6b side and the pressing drive member 10.
It is mounted between the arcuate concave portions formed by the individual arcuate convex portions 10b, and urges the pressure receiving member 6 and the pressing drive member 10 in the direction of separating from each other.

The spline portion 1b and the second screw portion 1c of the drive shaft 1 project into a recess 10d formed on the outer end surface of the pressing drive member 10, and the pressing drive member 10 is fitted into the spline portion 1b. Washer 15 and second screw part 1c
It is prevented from coming off from the drive shaft 1 by the nut 16 screwed to the.

The reverse rotation prevention wheel 9 is formed with locking teeth 9a which are inclined in one direction of the circumference on the outer peripheral portion. One of the locking teeth 9a is pivotally supported by the side plates 3 and 4, and the spring 1
A ratchet pawl 18 that is pressed toward the locking tooth 9 a side of the reverse rotation prevention wheel 9 is locked by 7. This ratchet claw 18
Due to the locking action, the reverse rotation preventing wheel 9 can rotate only in the winding direction of the load sheave 2.

The upper and lateral peripheral portions of the side plates 3 and 4 for holding the load sheave 2 are bent so as to close the outer peripheral portion of the load sheave 2 and the load chain 19 wound around the load sheave 2, and the bent portions come into contact with each other. The flange portions 3a and 4a formed on the surface, together with the brake cover 20 described later,
It is fastened by a plurality of bolts 21 and nuts 22.

In order to prevent the load chain 19 wound around the load sheave 2 from coming off the load sheave 2, the chain guides 3 are provided on the inner surfaces of the side plates 3 and 4.
a and 4a are integrally formed by molding or the like. Each of the chain guides 3a and 4a includes a portion formed in an arc shape along the load sheave 2, and an arc-shaped protrusion protruding toward the load chain 19 on the load side away from the load sheave 2.

Below the load sheave 2, there is a buttonhole 23 provided with a projecting portion toward the center of the load sheave 2.
It is held at 4. 24 is the lower side of the buttonhole 23,
4 is a coupling member that integrally couples the coupling member 24. The coupling member 24 has the spring 17 and the ratchet pawl 18 attached to one shaft portion protruding from the side plate 3.

The outside from the load sheave 2 to the push wheel 11 is divided at the center of the load sheave 2, and the lower side of the load sheave 2 is open.
It is covered by 0,20. The upper surfaces of the body covers 20 and 20 are tightened by the bolts 21 and nuts 22, which are shared with the side plates 3 and 4, and the flange surfaces superposed on the surfaces of the side plates 3 and 4 are tightened. It is fixed to the side plates 3 and 4 by nuts 25 and 25 that are screwed with screw portions formed at both ends of the coupling member 24.

Also, the side plates 3 through which the upper hooks 26 penetrate are provided.
On the joint surface of No. 4, locking recesses 3b and 4b that are fitted to the locking shaft portion 26a provided at the lower end of the upper hook 26 are formed, and are sandwiched between the locking recesses 3b and 4b. Hook 26
Is held on the side plates 3 and 4 by a locking portion 26b formed at the lower end of the locking shaft portion 26a.

Reference numeral 27 is a safety fitting whose one end is pivotally attached to the base end portion of the upper hook 26, and the safety fitting 27 is biased in a direction to close the opening of the upper hook 26. The attachment of the upper hook 26 to the support member is performed by pressing the portion of the safety fitting 27 against the support member and rotating it inward. When the support member passes, the safety fitting 27 is rotated in the direction of closing the opening of the upper hook 26 by the urging force, so that the upper hook 26 is prevented from coming off the support member. A lower hook (not shown) equipped with a safety fitting having the same structure is attached to one lower end of the load chain 19.

An operating lever 28 is rotatably attached to the outer peripheral portion of the pressing drive member 10. Operating lever 2
Reference numeral 8 denotes an outer lever cover 28a which is rotatably fitted to an outer peripheral portion of the pressing drive member 10 which is slightly in front of the outer distal end portion thereof.
And one end is partially overlapped with the inside of the opening of the outer lever cover 28a, and the other end is fitted between the outer peripheral portion of the pressing drive member 10 and the inside of the opening of the main body cover 20 to be rotatable. It is composed of an inner lever cover 28b.

Reference numeral 29 denotes a nut which is provided inside the upper portion of the inner lever cover 28b and also serves as a spacer. The outer and inner lever covers 28a and 28b are fixed to the upper side by bolts 30 screwed with the nut 29.

A rotation direction switching claw 31 is housed in the operation lever 28 extending to the lower side of the pressing drive member 10. The rotation direction switching claw 31 is rotatably held with respect to the operation lever 28 by a support shaft 32 having one end protruding outside the outer lever cover 28a.

Reference numeral 33 denotes a push spring held in the operating lever 28, and the rotation direction switching claw 31 is pushed at its lower end portion by a push pin 34 pushed upward by the push spring 33. A handle 35 for operating the rotation direction switching claw 31 is attached to the support shaft 32 protruding outward from the outer lever cover 28a.

The rotation direction switching claw 31 is locked by the locking gear 10a of the pressing drive member 10 so that the pressing drive member 10 can be rotated in the winding direction or the winding direction by the handle 35. It is switched to a neutral position that does not engage with, and is held at each switching position by the push spring 33 and the push pin 34.

In the above embodiment, in order to efficiently assemble the apparatus, the engaging concave and convex portions for positioning are integrally formed on the joint surface of the pair of side plates 3 and 4 by press molding or the like. And it is sufficient.

Next, the operation of the apparatus will be described. The rotation direction switching claw 31 is locked to the pressing drive member 10 in the winding direction. When the lower hook holds the load in this state and the operation lever 28 is reciprocally rotated, the pressing drive member 10 moved to the pressure receiving member 6 side causes the reverse rotation prevention wheel 9 and the friction on both sides thereof via the push wheel 11. The members 7 and 8 are pressed against the pressure receiving member 6.

In this state, since the load sheave 2 is rotated in the winding direction together with the pressing drive member 10,
The load held by the lower hook is intermittently wound up as the operation lever 28 reciprocally rotates.

On the contrary, when the rotation direction switching claw 31 is switched to the lowering direction and the operation lever 28 is reciprocally rotated, the pressing drive member 10 is moved away from the pressure receiving member 6. In this state, the pressure receiving member 6 screwed to the load sheave 2 and the drive shaft 1 is rotated in the lowering direction by the weight of the load, and the load is moved in the lowering direction.

However, when the drive shaft 1 is rotated in the unwinding direction, the pressing drive member 10 is moved to the pressure receiving member 6 side and the rotation of the drive shaft 1 is stopped, so that the load is held at that position. For this reason, when the operating lever 28 is reciprocally rotated, the load is gradually lowered in a safe state intermittently.

[0032]

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

In the lever hoist according to the first aspect, the chain guides are integrally formed on the inner surfaces of the pair of side plates, and the engaging recesses for engaging the upper hooks are formed on the joint surface through which the upper hooks penetrate. Therefore, the number of parts can be remarkably reduced and the structure can be simplified as compared with the conventional case in which the two chain guides and the connecting members for the upper hooks are formed separately from the side plates and screwed respectively. Therefore, the work efficiency at the time of assembling can be improved and the assembling cost can be reduced.

Further, since the pair of side plates are constructed such that the upper and lateral peripheral portions of the load sheave are closed and their joint surfaces are screwed together, the pair of side plates accommodates the pair of side sheaves and the load chain. Rainwater and dust can be prevented from entering the side plate, and the lever hoist can be smoothly operated for a long period of time.

In the lever hoist according to the second aspect of the present invention, the pair of side plates have the engaging concave and convex portions for positioning integrally formed on their abutting surfaces by press molding or the like. The work efficiency and the assembly cost can be further improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a left front view of FIG.

FIG. 4 is a left side view of FIG.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a front view showing an embodiment of a side plate.

FIG. 7 is a right side view showing a part of FIG. 6 in a sectional view.

FIG. 8 is a front view showing an embodiment of the body cover (inside).

9 is a right side view of FIG.

[Explanation of symbols]

 1 Drive shaft 2 Load sheave 3,4 Side plate 3a, 4a Chain guide 3b, 4b Locking recess 6-9 Brake part 10,11 Drive part 19 Load chain 21,22 Screw member 26 Upper hook 26a Locking shaft part 28 Operation lever

Claims (2)

[Claims] 1. A load sheave and a chain guide are sandwiched by a pair of side plates and fixed by a screw member, and a drive unit protruding from one side plate is screwed with a brake unit and a drive unit.
In a lever hoist in which an operating lever is engaged with the drive portion, each side plate has a chain guide integrally formed on its inner surface by press molding or the like to prevent the load chain from coming off. The peripheral part on the side is closed by superposition, and further, the superposed part of each side plate is fixed by a screw member, and the joint surface through which the upper hook penetrates is fitted with the locking shaft part provided at the lower end of the upper hook. A lever hoist having an engaging recess formed therein. 2. The lever hoist according to claim 1, wherein the pair of side plates are integrally formed with an engaging concave-convex portion for positioning on their joint surfaces by press molding or the like.