JP2927750B2 - Lever handle for lever hoist - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lever handle for a lever hoist which is mainly applied to a small lever hoist in which a load to be handled is about half of a standard type 500 kg.

[0002]

2. Description of the Related Art Conventionally, a lever hoist for 500 kg is a standard type, and can be used for raising and lowering a small load.
This standard type was used. In the standard type lever hoist, a pair of lever covers A _{1 and} A ₂ constituting the lever handle A are provided with screw members B, C, D, the lever handle A is fixed to the lever handle A by a screw member with a grip E for preventing slippage being attached to a tip end having substantially the same width. In addition, the coil spring F is housed in a spring receiving member H having a U-shaped cross section and a bottom plate G in order to prevent the coil spring F from falling down inside the wide lever handle A, and is inserted into the coil spring F. The pressed push pin J is pressed against the rotation direction switching claw K. Also, a lever handle a made of cast aluminum for making a small lever hoist has been made in a wrench structure of a working tool as shown in FIGS. The switching member b at the top of the handle has a vertical switching gear b _{1 on the} outer peripheral surface.
There together to form a spline b ₂ to be engaged with the press drive member (not shown) on the inner circumferential surface had been formed. A switching claw d is rotatably held in a window c below the switching member b by a pin e. The switching claw d has two locking teeth d _{1 and} d ₂ formed on both left and right sides of the upper surface.
It was urged upward by a coil spring h via a ball g mounted in a recess f at the center of the lower surface. A rubber grip k for preventing slippage was also attached to the lever handle a having this configuration, and was fixed to the lever handle a with a set screw m. In addition, the conventional lever hoist is shown in FIG.
As shown in, the outermost diameter of the press drive member X that is disposed in the proximal portion of the lever handle A is a lever handle A base end portion upper opening A ₃ formed therethrough axially outermost It was formed larger than the inner diameter.

[0003]

However, in the conventional configuration for 500 kg, a spring receiving member H for preventing the coil spring F from falling down must be fixed in the lever handle A, and a pair of lever covers is required. a _1, a ₂ 3 screws member B for fastening the, C, D because the required, but the device becomes the number of parts have to miniaturization difficult, the assembling work of the apparatus I couldn't do it efficiently. Further, in the conventional aluminum cast lever handle, since rainwater and dust enter through the window c of the lever handle a, the ball g and the coil spring h are easily hindered from operating smoothly. Moreover, the recess f of the switching claw d and the ball g
Contact because the area is very small, in the neutral position, the state where it is difficult to hold the switching claw d in a stable posture, engages the gear b ₁ switching either locking teeth d _1, d ₂ is the Becomes For this reason, a malfunction occurs, safety at the time of operation is likely to be impaired, and the lower hook cannot be quickly moved. In addition, since the lever handle a is made of aluminum and integrally formed,
It takes time and effort to assemble the ball g and the coil spring h, and is not suitable for increasing the productivity of the lever hoist.

Further, in the conventional configuration in which the grips E and k are attached to the lever handles A and a, the number of parts increases and the work efficiency at the time of assembling deteriorates, so that the production cost increases. In addition, when the grips E and k are damaged due to use or changes over time, the grips E and k must be replaced with new ones, so that there is a disadvantage that extra maintenance costs are required. In addition, conventional lever hoists, the innermost diameter of the upper opening A ₃ of the lever handle A,
Since the outermost diameter of the press drive member X was smaller and more, before assembling of the lever hoist, after passing through the upper opening A ₃ of one lever cover A ₁ to the drive shaft Y, screwed the press drive member X And then the other lever cover A ₂
The lever cover A ₁ , A ₂ is fixed to each other with a plurality of bolts Z to form a lever handle A through the upper opening portion A ₃ of the above, and finally, the operation wheel S is attached to the drive shaft Y to position each member. Met. That is, it is necessary to install the lever handle A on the drive shaft Y while assembling, and the assembly is troublesome.

[0005] The present invention has been made in view of these circumstances, the rotation direction switching pawl can be held in a stable state even in the neutral position, and a pair of lever covers are efficiently fastened with a small number of screw members to produce It is an object of the present invention to provide a lever handle for a lever hoist which can enhance the performance. Another object of the present invention is to provide a lever handle for a lever hoist that can be assembled on a drive shaft so that a pressing drive member can be fitted over the upper opening of the lever handle after the lever handle is assembled. is there.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and a switching gear for a pressing drive member is provided with a rotation direction switching claw which is detachably engageable to rotate the pressing drive member. A lever handle for operating a load sheave via a drive shaft, the lever handle being constituted by a pair of split lever covers, and the pair of lever covers being an operation handle of one lever cover. The nut pin fixed to the center in the vertical direction of the part is integrally fastened by screwing a screw member via the other lever cover, and the upper surface of the nut pin is provided with a rotation direction switching claw and a pressing drive member. A pressing pin, which is detachably held in a predetermined state, is placed via a coil spring, and the coil spring and the pressing pin are held by the side wall of the operation handle. A lever handle lever hoist, characterized in that the fall is held is prevented. When it is desired to prevent the gripping portion of the lever handle from slipping without attaching the grip, the lever handle may be configured such that a portion below the pressing pin to be stored becomes wider toward a lower end. Further, when it is desired to securely couple the pair of lever covers by using a small number of screw members, the lever handle may be configured such that two positions, that is, the position of the nut pin and the center of the lower end of the lever handle are fastened by the screw members. Furthermore, when it is desired to easily attach the lever handle to the drive shaft , the lever handle is attached by screwing the pressing drive member to the drive shaft.
After the beam is pressed, the pressing drive member is fitted outside at the upper opening.
It is inserted and attached along the drive shaft , and preferably, cylindrical projections formed at both ends of the upper opening of the lever handle are provided at the circular opening of the brake lever and the reduced-diameter portion on the distal end side of the operating wheel. What is necessary is just to set it as the structure fitted and arrange | positioned, respectively.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a load sheave held by a pair of parallel side plates 2 and 3;
Unlike the case for kg, it is fixed to the drive shaft 4 without passing through a gear train, and is directly driven by the drive shaft 4. The drive shaft 4 protrudes outward from one of the side plates 2, and the protruding portion includes three shaft portions having different diameters, and each of the shaft portions is provided with a screw. The drive shaft 4 includes a pressure receiving member 5 including a boss portion 5a and a flange portion 5b on a male screw portion close to the side plate 2, and the flange portion 5b
Are screwed together. The boss 5a of the pressure receiving member 5 has a reverse rotation preventing wheel 6 in the middle and a pair of friction members 7, 7 on both sides of the boss portion 5a, which are in close contact with the reverse rotation preventing wheel 6, and which are externally inserted. These reverse rotation preventing wheels 6
The pair of friction members 7, 7 are pressed toward the flange portion 5b by the outer peripheral side annular surface of the pressing drive member 8 screwed to the drive shaft 4. In the circular hole 5c formed in the front end surface of the pressure receiving member 5 and the truncated conical recess 8a formed in the center of the end surface of the pressing drive member 8, the coil spring 9 is compressed to the drive shaft 4 in a compressed state. Extrapolated.

[0008] The pair of side plates 2 and 3 include a load sheave 1.
Are covered in an abutting state, and the abutted flange portions are connected by a plurality of screw members 10. Reference numeral 11 denotes an upper hook attached to an upper portion of the pair of side plates 2 and 3, and the upper hook 11 is rotatable with respect to the side plates 2 and 3. A lower portion of the pair of side plates 2 and 3 is a connecting screw member 1 having a different diameter shaft portion also serving as a spacer.
The spacing is kept constant by two. Connection screw member 1
Reference numeral 2 denotes a shaft protruding from the side plate 2, to which a locking claw 13 for engaging with the reverse rotation preventing wheel 6 is attached.
Is pressed against the reverse rotation preventing wheel 6 by a biasing member 14 mounted on a connecting screw member 12 between the side plate 2 and the locking claw 13. Reference numeral 15 denotes a brake cover that covers the periphery of the brake unit. The brake cover 15 shares the connection screw member 12 that holds the pair of side plates 2 and 3 at a fixed interval.
It is fixed to.

A switching gear 8b is formed on the outer peripheral surface of the pressing drive member 8 opposite to the pressure receiving member 5. An operation wheel 16 is screwed into an externally threaded portion of the drive shaft 4 having an intermediate thickness protruding from the pressing drive member 8. After the operation wheel 16 is fitted with a washer 17 on a small-diameter external thread projecting into a concave portion 16a formed at the center of the outer end surface, the drive shaft is driven by a hexagonal grooved nut 18 screwed into the small-diameter external thread. 4
It is locked so that it does not come off. Reference numeral 19 denotes an iron lever handle composed of a pair of lever covers 19A and 19B. The upper portion of the lever handle 19 covers the switching gear 8b of the pressing drive member 8 and a part of the operation wheel 16 so as to surround it. The lower portion of the lever handle 19 is an operation handle extending in a direction perpendicular to the drive shaft 4. The upper opening 19C formed at the base end of each of the lever covers 19A and 19B is formed in a tubular shape whose inner diameter is larger than the outermost diameter of the pressing drive member 8. Therefore, after the pressing drive member 8 is screwed onto the driving shaft 4, the lever handle 19 can be inserted along the driving shaft 4 so that the pressing driving member 8 is fitted over the upper opening 19C.
The lever handle 19 is positioned by an operation wheel 16 provided at an end of the drive shaft 4 and a nut 18 with a hexagonal groove. Thereby, the end of the upper opening 19C of one lever cover 19B is partially inserted into the circular opening 15a of the brake cover 15, and the other lever cover 19B is inserted.
The end of the upper opening 19 </ b> C of A is inserted outside the distal end side of the operation wheel 16, and the lever handle 19 is rotatable around the drive shaft 4. Lever covers 19A and 19B
Has a U-shape cross section except for the upper opening 19C, and closes the inside by abutting the U-shaped tips to prevent rainwater and dust from entering the inside.

In the lever handle 19 below the pressing drive member 8, a rotation direction switching claw 20, a pressing pin 21,
And the coil spring 22 are housed. The rotation direction switching claw 20 is fixed to a switching pin 23 held by lever covers 19A and 19B, and a switching lever 24 is attached to a shaft of the switching pin 23 protruding from the lever cover 19A. Therefore, when the switching lever 24 is rotated in the left-right direction, the two locking claws 20 formed on both right and left ends of the rotation direction switching claw 20 are formed.
a or 20a is engaged with the switching gear 8b.
The lower end of the coil spring 22 is held at one end by a nut pin 25 caulked to the lever cover 19A. The pair of lever covers 19A and 19B are provided at the other end of the nut pin 25 also serving as a spacer, so that a screw member 26 to be screwed with the screw portion 25a and a screw member to fix the lower end central portion of the lever handle 19 so as to be tightened from the outside. 27 and is more securely fastened.

The pressing pin 21 is provided with a spring seat 21a larger than the pressing pin 21 at a portion near the upper end, and the upper end of the pressing pin 21 is formed into a spherical curved surface. The pressing pin 21 is inserted into the coil spring 22 and the spring receiving seat 2
1 a is held by the upper end of the coil spring 22, and the upper end spherical portion of the pressing pin 21 is curved by the urging force of the coil spring 22 on both the left and right sides and the center of the lower surface of the rotation direction switching claw 20. Recesses 20b, 20c, 2
0d. The upper end spherical portion of the pressing pin 21 has concave portions 20 b and 20 formed on the lower surface of the rotation direction switching claw 20 as compared with the conventional case using the ball g.
Since the contact area with c and 20d is increased, even in the neutral position where the contact area is pressed by the concave portion 20d with the smallest contact area,
The rotation direction switching claw 20 is held in a stable posture to prevent malfunction, and the lower hook can be quickly moved.

Each component is smaller than the standard type by setting for 250 kg, and the lever handle 1
Numeral 9 is formed so that the gap from the switching gear 8b of the pressing drive member 8 to the coil spring 22 is reduced with each component. For this reason, lever handle 1
9, the length, width and thickness are reduced, and the lever hoist is reduced in size and weight and is easy to handle. Further, the lever handle 19 is formed to have a small width also in a portion where the coil spring 22 is housed, and the coil spring 22 is
The pair of lever covers 19A and 19B surrounding the outer peripheral portion is configured to prevent the side from falling down. further,
The lever handle 19 is formed so as to increase in width toward a lower end in a portion below the pressing pin 21. This configuration of the operation handle increases the frictional resistance at the portion where the width of the lever handle 19 is widened, prevents slippage at the operation handle, and improves safety during operation.

Next, another lever handle according to the present invention, which is characterized by a method of assembling it to the drive shaft 4, will be described below. FIG. 6 is a longitudinal sectional view showing a lever hoist to which another embodiment of the lever handle of the present invention is applied. In this embodiment, the lever handle 19 is composed of a pair of lever covers 19A and 19B having the same shape, and a rotation direction switching claw 20 which can be disengaged from the switching gear 8b of the pressing drive member 8 of the lever hoist, and this rotation. A pressing pin 21 and a coil spring 22 for fixing the direction switching claw 20 in a predetermined state, and a switching lever for changing an engagement state between the switching gear 8b of the pressing drive member 8 and the locking claw 20a of the rotation direction switching claw 20. 24 are provided.

FIG. 7 shows a lever cover 19A (or 19).
3B is a diagram showing a front view, FIG. 3B is a rear view, FIG. 3C is a cross-sectional view along AA, and FIG.
It is sectional drawing. Each lever cover 19A, 19B has a substantially U-shaped cross section, as shown in FIG. Also, the lever covers 19A and 19B are attached to the base end 19X on the upper side.
An upper opening 19C is formed penetrating in the front-rear direction, and an operation handle 19 extends downward from the base end 19X. And this operation handle part 19Y
The central portion in the vertical direction is formed to be slightly narrower, and the upper and lower portions are formed to be slightly wider as going outward in the vertical direction.

The peripheral edge of the upper opening 19C of each of the lever covers 19A and 19B is bent forward to form a cylindrical projection 1A.
9D is formed. A substantially circular reinforcing plate 19Z is fixed by spot welding to a lower portion on the inner surface side of the upper opening 19C of the lever covers 19A and 19B, as shown in FIG. The reinforcing plate 19Z is formed in a shape in which the upper part of the disk is cut out in the left-right direction, and the cutout end is disposed toward the lower end of the upper opening. Also, a lever cover 19A,
A circular pivot hole 19E is formed also penetrating through 19B. The pivot hole 19E is provided with an upper opening 19C.
Is formed at a vertically lower position. In the pivot hole 19E,
A switching pin 23 having a rotation direction switching claw 20 is pivotally supported, and one end of the switching pin 23 is provided to protrude outside the lever cover 19A, and a switching lever 24 is provided at the protruding portion.

A pivot hole 19E is formed at the center and lower end of the operation handle 19Y of the lever covers 19A and 19B in the vertical direction.
The circular small holes 19F and 19G are formed at the vertically lower position of the. One end of a nut pin 25 is swaged in a small hole 19F formed at the center of the operation handle 19Y of one lever cover 19A, and is formed so as to open at the other end of the nut pin 25. Screw part 25
By screwing the screw member 26 into the a through the small hole 19F of the operation handle Y of the other lever cover 19B, the lever covers 19A and 19B are fixed to each other. Note that the operation handles 19Y, 19Y of the lever covers 19A, 19B.
A connection pin 27A also serving as a spacer is provided between the small holes 19G, 19G formed at the lower end portion of the first member. A rotation direction switching claw 2 is provided above the nut pin 25.
A pressing pin 21 is provided by being urged upward by a coil spring 22 so that 0 can be fixed in a predetermined state. In addition,
In the illustrated example, the pressing pin 21 and the coil spring 22 are attached using a spring receiving member 30.

FIGS. 8A and 8B are views showing the spring receiving member 30 of this embodiment, wherein FIG. 8A is a front view, FIG.
(C) is a plan view. As shown in this figure, the spring receiving member 30 is formed in an upward U-shape, and as shown in FIG.
The size is adapted to the inner width of the central portion of the operation handle 19Y of A, 19B. The spring receiving member 30 is provided so as to be placed on the nut pin 25. The pressing pin 21 is formed in a vertically elongated rod shape, and a flange-shaped spring receiving seat 21a is formed at an upper end portion so as to expand radially outward. The upper end of the spring receiving seat 21a is provided with each of the recesses 20b, 2 formed below the rotation direction switching claw 20.
It protrudes upward in a spherical shape having an arc conforming to 0c and 20d.

The pressing pin 21 is provided with a coil spring 22 externally fitted from the lower end thereof, and is disposed on the spring receiving member 30 with the coil spring 22 slightly shortened.
That is, the coil spring 22 is arranged such that the upper end thereof is in contact with the lower end surface of the spring receiving seat 21 a of the pressing pin 21, while the lower end is in contact with the spring receiving member 30. This allows
The upper end of the pressing pin 21 engages with the recesses 20b, 20c, 20d of the rotation direction switching claw 20, and maintains the rotation direction switching claw 20 in a predetermined state. When the switching lever 24 is operated to rotate the rotation direction switching claw 20 to switch the rotation direction, the pressing pin 21 is pressed down against the urging force of the coil spring 22. .

Next, a method of assembling the lever handle 19 to the lever hoist will be described. The lever handle 19 of the present invention comprises a pair of lever covers 19A, 1
After the rotation direction switching claw 20 and the pressing pin 21 are assembled between 9B, they are attached along the drive shaft 4. The brake cover 15 has a short cylindrical circular opening 15a formed along the axial direction of the drive shaft 4 on the end face opposite to the load sheave 1, and the inner diameter of the circular opening 15a is determined by the lever handle. 19 cylindrical projections 19
It is formed in a size suitable for the outer diameter of D.

Therefore, after the pressing drive member 8 is attached to the driving shaft 4, the brake cover 1 is fitted so that the pressing drive member 8 is fitted over the upper opening 19 D of the lever handle 19.
The lever handle 19 is inserted along the drive shaft 4 until the cylindrical projection 19D of the lever handle 19 fits in the circular opening 15a of the drive handle 9. Thereafter, the operation wheel 16 is inserted into the drive shaft 4, the front-side reduced diameter portion 16 b of the operation wheel 16 is fitted to the cylindrical projection 19 D of the lever handle 19, and the hexagonal grooved nut 18 is connected to the end of the drive shaft 4. By screwing the lever handle 19, the lever handle 19, the operation wheel 16 and the like are positioned. Thereby, the circular opening 15a of the brake cover 15 is formed at each step formed at the base end of each of the cylindrical protrusions 19D, 19D.
And the end surface of the grip portion of the operation wheel 16 are respectively in contact with each other, and the lever handle 19 is sandwiched between the brake cover 15 and the operation wheel 16 to be positioned.

[0021]

According to the present invention, the following excellent effects can be obtained. In the lever handle for a lever hoist according to the first aspect, since the coil spring is surrounded by a pair of lever covers formed to have a small width, the coil spring falls down without using a spring receiving member. Can be prevented, and the rotation direction can be switched reliably. For this reason, the number of parts in the lever handle can be reduced, the work efficiency at the time of assembly can be improved, and the production cost can be reduced. Also, since the rotation direction switching claw is pressed by the tip of the pressing pin, the contact area can be made sufficiently larger than in the case of a conventional small lever hoist using a small ball. Even in the neutral position where no engagement is made, the rotation direction switching claw can be held in a stable posture. For this reason, it is possible to prevent a malfunction at the neutral position, which is likely to occur in the conventional small lever hoist, and to not only move the lower hook quickly, but also to improve safety during work. Moreover, since the nut pin holds the lower end of the coil spring and is also used for fastening the pair of lever covers, the number of screw members required for fastening the lever cover is reduced to improve work efficiency at the time of assembly. Production costs can be reduced.

In the lever handle for a lever hoist according to the second aspect of the present invention, the lower portion of the lever handle is formed such that the portion below the pressing pin to be housed becomes wider toward the lower end. Since the frictional resistance can be increased at the lower end side where the width is widened, it is possible to prevent the operation handle from slipping even if the anti-slip grip is not attached, thereby improving the safety at the time of work. Further, since it is not necessary to use the grip, not only the cost required for the grip but also the cost required for replacing the grip can be saved.

In the lever handle for a lever hoist according to the third aspect, since the position of the nut pin and the center of the lower end of the lever handle are fastened by a screw member, the length and width are small and the thickness is small. However, a thin lever handle can be securely fastened with a small number of screw members. For this reason, work efficiency at the time of lever cover fastening can be improved, and production cost can be reduced.

In each of the lever hoists according to the fourth and fifth aspects, the operation of assembling the lever handle and the operation of assembling the pressing drive member to the drive shaft can be performed separately. In other words , after assembling the pressing drive member to the drive shaft, it is possible to assemble the pressing drive member so as to fit outside the upper opening of the lever handle, and the assembling of the lever handle and the pressing drive member is easy,
Work efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing a lever hoist to which an embodiment of the present invention is applied.

FIG. 2 is a front view showing the relationship between the lever handle of the present invention and each component stored inside.

FIG. 3 is an exploded perspective view of a lever handle portion in a conventional example for 500 kg.

FIG. 4 is a vertical sectional side view of a conventional example for 250 kg.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a longitudinal sectional side view showing a lever hoist to which another embodiment of the present invention is applied.

7A and 7B show a lever cover of a lever handle of the lever hoist of FIG. 6, wherein FIG. 7A is a front view, FIG.
(C) is an AA sectional view, and (d) is a BB sectional view.

8 shows a spring receiving member of the lever hoist of FIG. 6,
(A) is a front view, (b) is a side view, and (c) is a plan view.

9 is an explanatory diagram showing a state where the spring receiving member of FIG. 8 is attached to the lever handle of FIG. 7, as viewed from the front side.

FIG. 10 is a vertical side view of a conventional lever hoist,
3 shows an assembled state of a pressing drive member and a lever handle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Load sheave 2, 3 Side plate 4 Drive shaft 8 Press drive member 8b Switching gear 15 Brake cover 15a Circular opening 16 Operating wheel 16b Tip side reduced diameter part 19 Lever handle 19A Lever cover 19B Lever cover 19C Upper opening 19D Cylindrical projection Part 20 Rotation direction switching claw 21 Press pin 22 Coil spring 25 Nut pin 26 Screw member 27 Screw member

Claims (5)

(57) [Claims] 1. A lever handle for a lever hoist, wherein a rotation direction switching claw is detachably provided on a switching gear of a pressing drive member, and a load sheave is operated via a drive shaft by rotating the pressing drive member. The lever handle is constituted by a pair of split lever covers, and the pair of lever covers is connected to a nut pin fixed to a vertically central portion of an operation handle portion of one lever cover via the other lever cover. A pressing pin for holding the rotation direction switching claw in a predetermined state so as to be detachable from the pressing driving member is mounted on the upper surface of the nut pin via a coil spring. A lever hoist characterized in that the coil spring and the pressing pin are held in such a manner that the coil spring and the pressing pin are prevented from overturning by the side wall of the operating handle. Lever handle. 2. The lever handle for a lever hoist according to claim 1, wherein the lever handle is formed such that a portion below a pressing pin to be housed becomes wider toward a lower end. 3. The lever handle according to claim 1, wherein two positions of a position of a nut pin and a central portion of a lower end of the lever handle are fastened by a screw member.
A lever handle for a lever hoist according to any one of the above. 4. The lever handle is pressed against a drive shaft.
After screwing and attaching the moving member, lift this pressing drive member up.
Insert along the drive shaft so that it fits outside at the side opening
The lever handle for a lever hoist according to any one of claims 1 to 3, wherein the lever handle is provided. 5. A cylindrical projection formed at both ends of an upper opening of the lever handle is fitted and disposed in a circular opening of a brake cover and a reduced-diameter portion on a distal end side of an operating wheel, respectively. The lever handle for lever hoist according to claim 4, characterized in that: