JP3274121B2 - Chain 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 chain lever hoist, and more particularly, to rotate a load sheave by reciprocating an operation lever to raise and lower a load chain wound around the load sheave. Related to chain lever hoist.

[0002]

2. Description of the Related Art Conventionally, a chain lever hoist of this type is known, for example, as shown in FIG.

That is, the chain lever hoist shown in FIG. 8 has a brake cover 1 that covers a mechanical brake disposed outside the side plate attached to the outside of the side plate.
An operation lever 3 for raising or lowering the load chain 2 is rotatably arranged on one end side in the length direction as a fulcrum. Further, a lever cover (not shown) is provided at a portion of the operation lever 3 facing the brake cover 1 to cover an opening of a component mounting chamber provided at one longitudinal end of the operation lever 3. The lever cover has one end in the length direction attached to the operation lever 3 via a bolt 4 and a nut.

In order to lift a load using such a chain lever hoist, for example, the switching lever 5 provided on the operating lever 3 is switched in the forward direction, and then the operating lever 3 is reciprocated. Then, the load chain 2 may be wound up.

[0005]

When the chain lever hoist constructed as described above is placed on the ground 6 as shown in FIG.
As the operation lever 3 swings from the position indicated by the solid line in FIG. 8 to the position indicated by the two-dot chain line during the reciprocating operation, the stop portion 7 of the bolt 4 provided at one longitudinal end of the operation lever 3 Collides with the ground 6, and the reciprocating operation of the operation lever 3 cannot be performed smoothly.

To cope with the above problems, the shape of the brake cover 1 may be increased so that one end in the longitudinal direction of the operation lever 3 does not protrude outward from the outer periphery of the brake cover 1. If the brake cover 1 is made large, there is a problem that the chain lever hoist becomes large.

It is also conceivable to eliminate the bolt 7 at one end in the longitudinal direction of the operation lever 3 to eliminate the above-mentioned stop margin portion 7. However, when lifting the load, the operation lever 3 is lifted.
As a result of the swing operation, a large load is applied to the swing fulcrum side of one end of the operation lever 3 in the length direction, so that the length of the operation lever 3 in the lever cover is It is necessary to stop the part facing one end in the vertical direction.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and has a simple structure at one end in the length direction of the operation lever 3 and at one end in the length direction of the operation lever on the lever cover. An object of the present invention is to provide a chain lever hoist that can stop an opposing portion and that can perform a swinging operation of an operation lever without any trouble, for example, during a lateral pulling operation of a load.

[0009]

In order to achieve the above object, the invention according to the first aspect of the present invention provides a brake cover for covering a mechanical brake, and a fulcrum provided outside one end of the brake cover in the length direction. A chain lever hoist including an operation lever rotatably disposed as a lever cover and a lever cover assembled to the operation lever, wherein one end of the operation lever in the length direction and the length of the operation lever in the lever cover A projection is formed on one of the one end in the direction and a portion facing the other, and a receiving portion for receiving the projection is provided on the other.

According to such a configuration, when assembling the lever cover to the operation lever, one end of the lever cover can be stopped at one end in the length direction of the operation lever only by fitting the projection into the receiving portion.

The invention described in claim 2 is the first invention.
In the invention described in (1), the protrusion is formed by cutting and raising a part of a metal plate in a protruding shape.

According to such a configuration, the projection can be easily formed by, for example, press molding.

[0013] The invention described in claim 3 is the first invention.
Or the one end in the length direction of the operation lever is formed so as not to protrude outside the outer periphery of the brake cover in the entire rotation range of the operation lever. .

According to such a configuration, even when the operation lever is swung during the lateral pulling operation of the load, one end in the length direction of the operation lever does not collide with the ground or the like.

According to a fourth aspect of the present invention, in the third aspect of the invention, the outer circumference of one end in the length direction of the operation lever is formed in a substantially arc shape centered on a pivot point of the operation lever. It is characterized by being.

According to such a configuration, it is possible to prevent one end in the length direction of the operation lever from hitting the ground or the like even when the operation lever is swung during the lateral pulling operation of the load due to the simple shape. Can not be.

[0017]

FIG. 1 is a longitudinal sectional view of a main part of a chain lever hoist according to an embodiment of the present invention. In the chain lever hoist, a load sheave 34 wound between a first side plate 31 and a second side plate 32 facing each other so as to mesh with a load chain 33 is provided via two bearings 35 and 36. It is rotatably supported. The first side plate 31 and the second side plate 32 are formed by a pair of upper stay bolts 7.
8 and a pair of lower stay bolts 79 (only one of them is shown in FIG. 1) is used to drive a gear cover 75 described later.
And the brake cover 77.

A drive shaft 37 is rotatably inserted into a shaft hole of the load sheave 34. This drive shaft 37
A first gear 48 formed at one shaft end, a load sheave insertion portion 49 into which the load sheave 34 is inserted, a screw portion 50 having substantially the same diameter, and a screw portion 50 And an operation handle insertion portion 52 formed to have a diameter smaller than that of the screwing portion 50 and through which an operation handle 59 to be described later is inserted, and formed at the other end of the shaft. Lock nut screwing portion 5 for screwing lock nut 64
3 is provided.

A mechanical brake 38 is provided outside the load sheave 34 in the axial direction (left side in FIG. 1) and outside the first side plate 31. The mechanical brake 38 includes a second hub 39 that is connected to the drive shaft 37 so as not to rotate relatively. Second hub 39
Is axially restricted by being screwed into the threaded portion 50 of the drive shaft 37 and the stopper member 54 being fitted into the fitting groove 51.
And a cylindrical portion 44 protruding outward in the axial direction from the flange portion 43 are integrally formed. Also, the second hub 3
The first lining plate 40, the reverse rotation preventing gear 41, and the second lining plate 42 are supported on the cylindrical portion 44 of the ninth tube 44 so as to be freely rotatable in that order from the outside in the axial direction.

Further, on the first side plate 31, two claw shafts 45 are provided at opposing positions, and the two claw shafts 45 are provided with reverse rotation preventing claws 46 that mesh with the reverse rotation preventing gear 41. Each is pivotably mounted on a pivot. Further, a claw spring 47 for biasing the reverse rotation preventing claw 46 toward the reverse rotation preventing gear 41 is provided between the reverse rotation preventing claw 46 and the first side plate 31 in each of the two claw shafts 45. The mechanical brake 38 is constituted by the second hub 39, the reverse rotation preventing gear 41, the first lining plate 40, the second lining plate 42, and the reverse rotation preventing claw 46.

Further, outside the mechanical brake 38 in the axial direction, the first hub 55 is connected to the threaded portion 5 of the drive shaft 37.
0 is screwed. The first hub 55 has a cylindrical shape, and engagement teeth 56 are formed on the outer periphery thereof. A spring whose inner peripheral portion is formed in a concave shape is provided at an end portion on the inner side in the axial direction (right side in FIG. 1). A receiving portion 58 is provided, and an outer peripheral side thereof serves as a pressing portion 57 for pressing the first lining plate 40 of the mechanical brake 38.

A coil spring 92 is interposed between the spring receiving portion 58 of the first hub 55 and the second hub 39. The coil spring 92 is formed of a compression spring, and urges the first hub 55 and the second hub 39 apart in order to keep the mechanical brake 38 released during the idle operation. Therefore, this coil spring 92
When the drive shaft 37 is given a rotational drive exceeding the contact resistance with the first hub 55 in the idle state, the mechanical brake 38 is operated, that is, the first hub 55 is screwed. One having a degree of spring force is employed.

Further, outside the first hub 55 in the axial direction, the operation handle 59 is inserted through the operation handle insertion portion 52 of the drive shaft 37. This operation handle 59
Consists of a base portion 60 and a cylindrical grip portion 61 continuously projecting from the outer periphery of the base portion 60. The base portion 60 is attached to the first hub 55 by two screws 62 and 63 so as to be relatively non-rotatable. ing.

A lock nut 64 is provided at the shaft end of the drive shaft 37 on the axially outward side of the operation handle 59 at a predetermined distance from the operation handle 59 inserted into the drive shaft 37. Is screwed. The lock nut 64 is fixed at the shaft end of the drive shaft 37 so as not to be movable in the axial direction by a lock pin 65, thereby restricting the axial movement range of the first hub 55 that moves together with the operation handle 59. ing.

The other end of the drive shaft 37 in the axial direction is supported by a bearing 66. Between the bearing 66 and the load sheave 34 and outside the second side plate 32, A gear reduction mechanism 67 having a plurality of reduction gears is provided. The gear reduction mechanism 67 includes a first gear 48 formed at a shaft end of the drive shaft 37, a second gear 70 meshed with the first gear 48, and a second gear 70 formed on a pair of intermediate shafts 68 and 69, respectively. 71, and third gears 72 also formed on the pair of intermediate shafts 68 and 69, respectively.
And 73, coupled to an extension of the load sheave 34,
A fourth gear 74 meshes with each of the third gears 72 and 73. The drive from the drive shaft 37 is the first
Each second gear 70 and 71 meshing therewith from the gear 48
And transmitted from the intermediate shafts 68 and 69 supporting the second gears 70 and 71 to the fourth gear 74 via the third gears 72 and 73 also supported by the intermediate shafts 68 and 69. Thus, the drive from the drive shaft 37 is transmitted to the load sheave 34 at a predetermined reduction ratio.

A gear cover 75 for covering the gear reduction mechanism 67 is attached to the second side plate 32. A pair of intermediate shafts 68 and 69 are connected to the second side plate 32 and the side end of the gear cover 75. Are rotatably supported via bearings.

A brake cover 77 for covering the mechanical brake 38 is attached to the first side plate 31. The brake cover 77 has a substantially circular opening 76 through which the first hub 55 is inserted.
The screw 6 is screwed to the threaded portion 50 of the drive shaft 37 in such a manner as to be inserted inward in the axial direction from 6.

On the other hand, one end of the operating lever 10 in the longitudinal direction is loosely fitted to the outer periphery of the first hub 55. The operating lever 10 is connected to the first hub 55 and a predetermined outside of the brake cover 77. It is rotatably supported in a spaced state.

The operation lever 10 is formed of a sheet metal member. As shown in FIGS. 4 and 6, one end of the operation lever 10 in the longitudinal direction has an engagement claw 80, a pressing member 87, and a play insertion member 88 described later. There is provided a component installation room 11 for housing therein. The component installation chamber 11 is provided with a partition plate 12
And the standing plate portion 13 rising from the periphery of the partition plate portion 12.
When the operation lever 10 rotates with respect to the brake cover 77, all of the rotations of the one end edge of the partition plate portion 12 located at one end in the length direction of the operation lever 10 are performed. In the range, it is formed so as not to protrude outside the outer periphery of the brake cover 77. More specifically, in the present embodiment, the outer periphery of one end of the partition plate 12 is
The operation lever 10 is formed in a substantially arc shape centered on a pivot point.

An operation handle 59 is provided on the partition plate 12.
Are formed, and a support hole 15 through which one end of a pivot 102 to be described later is inserted and supported is formed.
A fixing hole 160 for fixing two bolts 16 erected on the side is formed.

A receiving portion 18 formed of a rectangular through hole 17 into which a projection 25 described later can be fitted is formed in the upright plate portion 13 located at one longitudinal end of the operation lever 10.

On the other end of the operating lever 10 in the longitudinal direction, a grip portion 19 having a substantially cylindrical cross section is provided.

On the other hand, a lever cover 20 is formed at an opening of the component installation chamber 11. As shown in FIGS. 5 and 6, the lever cover 20 includes a cover-side partition plate portion 21 that covers the opening of the component-incorporating chamber 11, and rises from a peripheral edge of the cover-side partition plate portion 21 to move the lever lever 20 toward the operation lever 10. And a cover-side standing plate portion 22 along the inner surface of the standing plate portion 13.

A first hub 55 is provided on the cover-side partition plate portion 21.
, A support hole 151 through which the other end of the pivot 102 described later is inserted and supported, and an insertion hole 24 for the bolt 16 are formed. A projecting portion 25 that can be fitted into the through hole 17 that constitutes the receiving portion 18 is provided at a portion of the lever 10 that faces the receiving portion 18. The projecting portion 25 is formed in a rectangular shape by forming a pair of parallel slits 26 in the cover-side standing plate portion 22 and projecting the metal plate between the slits 26 outward by press molding. . If the projection 25 is formed by cutting and raising it in a protruding manner, it can be easily formed by press molding.

As shown in FIG. 1, an engaging claw 80 which engages with the engaging teeth 56 of the first hub 55 so as to be releasably engageable is provided in the component mounting chamber 11 of the operating lever 10 with a switching lever 86 on its head.
It is arranged to be swingable by a pivot 102 having.
The pivot 102 is bridged via a receiving member 150 between the partition plate portion 12 on the operation lever 10 side and the cover partition plate portion 21.

Further, the engaging claw 8 is provided in the component incorporating chamber 11.
0 to the engaging teeth 56, a loose insertion member 88 for loosely inserting the pressing member 87, and a pressing member 87.
And the pressing member 87 is interposed between the
A spring 89 for urging toward zero is interposed.

As shown in FIG. 3, the engaging claw 80 meshes with the engaging teeth 56 only when the first hub 55 is normally rotated (rotated in the winding direction) to drive the operation lever 10. The forward meshing projection 90 transmitting to the first hub 55 meshes with the engaging teeth 56 only when the first hub 55 is rotated in the reverse direction (rotation in the lowering direction) to drive the operating lever 10 with the first hub 55. And a reverse meshing projection 91 that transmits the force to the reverse direction.

By operating the switching lever 86, the engaging claw 23 meshes with the engaging teeth 56 of the first hub 17 at the forward engaging projection 90, and only the forward rotation of the operating lever 22 is performed. , A reverse rotation position where only the reverse driving is engaged, and a neutral position where the engaging claw 23 and the engaging teeth 56 do not mesh with each other.

As shown in FIG. 6, a peripheral portion of the circular hole 23 for loosely fitting the first hub 55 provided on the lever cover 20 has a lever-side connecting portion 93 for connecting to the brake cover 77. On the other hand, in the brake cover 77, the periphery of the opening 76 is
The brake cover side connecting portion 94 for connecting to the brake cover 0 is provided. The lever-side connecting portion 93 and the brake cover-side connecting portion 94 are connected to the first hub 55 by a connecting mechanism 95 provided at a predetermined interval.

The connecting mechanism 95 includes a cylindrical holding member 99 having flange portions formed on both side ends thereof and a concave portion formed between the flange portions, a lever side connecting portion 93 and a brake cover side connecting portion. And a ring-shaped sandwiching member 100 that is sandwiched together with 94.
By inserting the sandwiching member 100 into the concave portion of the sandwiching member 99 and inserting the lever-side connecting portion 93 and the brake cover-side connecting portion 94 in a state of being overlapped between both flange portions, the lever cover 20 and the brake cover Lever cover 2 while regulating axial movement of 77
0 and the lever cover 20 by the procedure described below.
The operation lever 10 on which the
7 rotatably supported.

Then, the lever cover 2 is attached to the operation lever 10.
As shown in FIG. 6, the procedure for assembling the cover 0 is to insert the cover-side standing plate portion 22 of the lever cover 20 into the component-mounting room 11 from the opening of the component-mounting room 11, and The projecting projection 25 is fitted into the through hole 17 forming the receiving portion 18 from the component installation chamber 11 side, and the tip end of the bolt 16 is inserted from the fixing hole 160 into the insertion hole 24. The nut 27 is screwed to the screw 16, and the tightening of the nut 27 causes the protrusion 25 to press against one inner edge 170 of the through hole 17, so that the lever cover 20 is securely positioned with respect to the operation lever 10. Because When the lever cover 20 is assembled to the operation lever 10 in this manner, the protrusion 25 is simply fitted into the receiving portion 18 without forming one end in the length direction of the operation lever 10 by bulging the stop margin.
In other words, when the operation lever 10 rotates with respect to the brake cover 77, the one end edge of the partition plate portion 12 located at one longitudinal end of the operation lever 10 is moved over the brake cover 77 in the entire rotation range. It can be easily and reliably stopped while being formed in a substantially arc shape centered on the rotation fulcrum of the operation lever 10 so as not to protrude outward of the outer periphery of the operation lever 10.

Next, as shown in FIG. 7, the chain lever hoist of the present embodiment configured as described above is placed on the ground 30 and is placed at the tip of the load side of the load chain 33 (the side on which the load is applied). A method of laterally pulling a load hooked on the lower hook 133 provided will be described.

First, after the engaging claw 80 is positioned at the normal rotation position by operating the switching lever 86, the operating lever 10 is reciprocated. Then, as shown in FIG. 1, the first hub 55 is driven by the operation lever 10 to drive the drive shaft 37.
The drive shaft 37 is driven in the forward rotation direction via the second hub 39 which is screwed up and presses the first lining 40 of the mechanical brake 38 so as to be relatively non-rotatably connected to the drive shaft 37. Is done. When the drive shaft 37 is driven, the drive is transmitted to the load sheave 34 via the gear reduction mechanism 67, whereby the load sheave 34 rotates in the normal rotation direction. As a result, this road sheave 34
The luggage caught on the lower hook 133 provided at the tip of the load chain 33 wound around is pulled laterally.

In the chain lever hoist of this embodiment, when one end of the operating lever 10 in the longitudinal direction rotates with respect to the brake cover 77, the brake cover 77
7 does not protrude outwardly of the outer periphery of the control lever 10, so that one end in the length direction of the control lever 10 does not collide with the ground when the control lever 10 is rotated, and the solid line in FIG. Can be freely rotated from the position indicated by the dotted line to the position indicated by the two-dot chain line, so that the above-mentioned lateral pulling operation of the load can be performed smoothly.

In the present embodiment, the projection 25 is formed by cutting and raising a part of the metal plate constituting the lever cover 20 outward. However, the present invention is not limited to this. May be fixed to the outer surface of the cover-side standing plate portion 22 of the lever cover 20 by welding, and this metal piece may be used as the projection 25.

Further, in the present embodiment, the receiving portion 18 is formed from the through hole 17, but the present invention is not limited to this. For example, a part of the standing plate portion 13 may be depressed outward, The inside of this recess may be used as the receiving portion 18.

In this embodiment, the lever cover 20
Side, and the receiving part 1 on the operation lever 10 side.
Although the number 8 is provided, the present invention is not limited to this, and the protrusion 25 may be provided on the operation lever 10 side, and the receiving portion 18 may be provided on the lever cover 20 side.

In the above embodiment, the operation lever 10
The outer periphery of one end in the longitudinal direction is formed in a substantially arc shape centered on the pivot point of the operation lever 10.
The shape is not limited to this as long as the shape does not protrude outward from.

[0049]

As described above, according to the first aspect of the present invention, the length of the operation lever in the lever cover is provided at one end in the length direction of the operation lever only by receiving the projection in the receiving portion. The portion facing the one end in the vertical direction can be stopped. Also, unlike the conventional case, there is no need to secure a bolt margin for fixing the lever cover to the operation lever at one end in the length direction of the operation lever. In the horizontal pulling operation, it is possible to prevent one longitudinal end of the operation lever from colliding with the ground.

According to the second aspect of the present invention, the protrusion is
For example, since it can be easily formed by press molding, the manufacturing cost is low.

According to the third aspect of the present invention, one end of the operation lever in the length direction may collide with the ground even when the operation lever is rotated during the lateral pulling operation of the load. Therefore, it is possible to smoothly carry out the lateral pulling operation of the luggage.

According to the fourth aspect of the present invention, one end in the length direction of the operation lever collides with the ground or the like due to the simple shape even when the operation lever is swung during the lateral pulling operation of the load. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing a chain lever hoist as one embodiment of the present invention.

FIG. 2 is a front view of the chain lever hoist shown in FIG.

FIG. 3 is an enlarged front view showing a main part of the chain lever hoist shown in FIG. 1;

4 (a) is a plan view, FIG. 4 (b) is a front view, and FIG. 4 (c) is a central longitudinal sectional view of the operation lever of the chain lever hoist shown in FIG.

5 is a lever cover of the chain lever hoist shown in FIG. 1, wherein (a) is a plan view, (b) is a front view, and (c) is a central longitudinal sectional view.

FIG. 6 is an enlarged longitudinal sectional view showing a main part of a brake cover, a lever cover, and an operation lever of the chain lever hoist shown in FIG. 1;

FIG. 7 is a front view showing an example of use of the chain lever hoist shown in FIG.

FIG. 8 is a front view showing an example of use of a conventional chain lever hoist.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Operation lever 18 Receiving part 20 Lever cover 25 Projection part 38 Mechanical brake 77 Brake cover

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B66D 3/14

Claims (4)

(57) [Claims] A brake cover that covers a mechanical brake, an operation lever that is rotatably disposed outside the brake cover with one end in a longitudinal direction thereof as a fulcrum, and a lever cover that is assembled to the operation lever. A chain lever hoist comprising: a protrusion formed at one of a longitudinal end of the operating lever and a portion of the lever cover opposed to the longitudinal end of the operating lever; A chain lever hoist is provided with a receiving portion for receiving the protrusion. 2. The chain lever hoist according to claim 1, wherein the protrusion is formed by cutting and raising a part of a metal plate in a protruding manner. 3. The operation lever according to claim 1, wherein one end of the operation lever in the longitudinal direction is formed so as not to protrude outside the outer periphery of the brake cover in the entire rotation range of the operation lever. 3. The chain lever hoist according to 1 or 2. 4. The chain according to claim 3, wherein an outer circumference of one end in a length direction of the operation lever is formed in a substantially arc shape centered on a pivot point of the operation lever. Lever hoist.