JP3612462B2 - Lever hoist - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lever block. More specifically, the present invention relates to a lever hoist capable of reducing the size of a handle, being easily detachable from an apparatus main body, and having a speed reduction means, which can be reduced in size.
[0002]
[Prior art]
Hereinafter, a conventional lever hoist will be described with reference to FIG. In FIG. 3, reference numeral 21 denotes a load sheave that is held by a pair of parallel side plates 22 and 23 and is fixed to the drive shaft 24. On the side close to the side plate 22 of the drive shaft 24, there is a boss portion 25a and a flange portion 25b. The pressure receiving member 25 is screwed in a state where the flange portion 25 b is brought close to the side plate 22. The boss portion 25a of the pressure receiving member 25 is extrapolated with a reverse rotation preventing claw wheel 26 in the middle and a pair of friction members 27, 27 in close contact with the reverse rotation preventing wheel 26. The reverse rotation preventing claw wheel 26 and the pair of friction members 27, 27 are pressed toward the flange portion 25 b by the outer peripheral side annular surface of the pressing drive member 28 screwed to the drive shaft 24. The idle wheel 36 which is an operation wheel is screwed. Reference numeral 39 denotes a lever handle, and an upper portion of the lever handle 39 covers a switching gear portion of the pressing drive member 28 and a part of the operation wheel 36. The upper opening 39 a formed at the base end portion of the lever 39 is formed in a cylindrical shape having an outermost inner diameter larger than an outermost diameter of the pressing drive member 28. Therefore, after the handle 39 is screwed onto the drive shaft 24 and the handle 39 is screwed, the upper opening 39a of the handle 39 is fitted on the press drive member 28 and inserted along the drive shaft 24 to the apparatus main body. Since the upper opening 39a of the handle 39 requires a shape larger than that of the pressing drive member 28 and is not provided with a speed reducer, the handle has a larger overall length than that provided with the speed reducer. .
[0003]
Although the above-described conventional example does not include a reduction gear, a lever hoist including a reduction gear will be described below.
In FIG. 4, on one side of a load sheave 41, a reduction gear 44 that rotates in mesh with a drive gear 43 fixed to an end of the drive shaft 42, and a reduction gear 45 that rotates coaxially with the reduction gear 44. And a reduction gear comprising a load gear 46 that rotates in mesh with the reduction gear 45 and is splined to the load sheave 41. The rotation of the handle 39 is transmitted to the drive shaft 42 on the other side of the load sheave 41. And a drive device including a brake receiver 48 as a pressure receiving member, a brake plate 49, a claw wheel 50, and an idle gear 51. As described above, since the speed reducer and the drive device are provided with the load sheave 41 interposed therebetween, the lever hoist body is large-sized, and the handle 39 has an opening 39a provided at the upper portion thereof fitted to the drive member 47. Therefore, as shown in FIG. 5, the opening 39a becomes large, and when the handle 39 is removed from the apparatus main body, the drive portion is exposed, and since the idle gear 51 is provided, it is difficult to attach and detach the handle 39. Had the problem of being.
[0004]
[Problems to be solved by the invention]
As described above, in the conventional lever hoist, the handle is mounted on the hoist body by fitting the upper opening provided in the handle to the drive member. Therefore, the upper opening provided in the handle is the pressing drive member. The handle is enlarged because it requires an opening that is larger than the outermost diameter, and the handle is not secure due to the removal of the handle, making it easy for rainwater, gravel, etc. to enter. Detachment is not easy, and it takes a long time for the detachment operation when the handle is detached and transported.
[0005]
Moreover, in the lever hoist provided with the reduction gear, the lever hoist main body became large and became an obstacle for weight reduction.
SUMMARY OF THE INVENTION The present invention provides a lever hoist that can be easily attached to and detached from the lever hoist and that can be reduced in size and weight even with a reduction gear.
[0006]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems. A lever hoist having a drive shaft for rotating a load sheave, a drive gear for rotating the drive shaft, and a pressure receiving member is provided with a rotation gear that meshes with the drive gear. A lever hoist characterized in that a handle is fixedly attached to or detached from a rotating shaft of a gear.
[0007]
According to the present invention, the rotation gear that meshes with the drive gear is provided, and the rotation gear is fixed to the rotation shaft on which the handle is mounted. Therefore, the handle can be greatly reduced in size compared to the conventional device, and the handle It is very easy to attach and detach, and even when the handle is removed, the drive member is concealed in the main body cover so that the airtightness of the device main body is maintained, and the rotary gear fixed to the rotary shaft and the drive shaft are attached. Since there is also a reduction function that transmits rotation at a constant reduction ratio between the driven gears, the entire device can be downsized and the number of parts can be reduced compared to a lever hoist device equipped with a conventional reduction device. Since it can be significantly reduced, a low-cost lever hoist device can be provided.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
According to a first aspect of the present invention, there is provided a drive shaft for rotating a load sheave, a drive gear mounted on the drive shaft and rotating the drive shaft via a brake plate, a claw wheel, and a pressure receiving member, and a drive a pressure receiving member provided in the axial load sheave side, in the lever hoist having a brake plate mounted across the ratchet wheel to the flange portion of the pressure receiving member, meshed drive gear and at a constant speed reduction ratio, the drive gear the rotating gear to rotate the provided characterized in that the mounted handle wear detachably to the rotary shaft of the rotary gear, a rotary gear that meshing provided driving gear and at a constant speed reduction ratio, the rotation gear wheel Since the handle is fixed to the rotating shaft, the handle can be greatly reduced in size compared to conventional devices, and the handle is extremely easy to attach and detach. In It has an action capable of maintaining the airtightness of the apparatus main body because it is 蔽.
[0009]
In addition, it has a reduction function that transmits rotation at a constant reduction ratio between the rotation gear fixed to the rotation shaft and the drive gear attached to the drive shaft. And since the whole apparatus can be reduced in size and the number of parts can also be reduced significantly, it has the effect | action which can provide a low-cost lever hoist apparatus.
[0010]
The invention according to claim 2 is characterized in that an idle end is provided at the end of the drive shaft along the cam guide to release the connection between the drive gear and the pressure receiving member. In addition to the operation of the first aspect of the present invention, the drive gear can be easily put into the idle state by idle rotation.
[0011]
Embodiment
Hereinafter, an embodiment of the present invention will be described with reference to FIG.
In FIG. 1, reference numeral 1 denotes a rotary shaft to which a handle is mounted, 2 denotes a rotary gear fixed to the rotary shaft 1, 3 meshes with the rotary gear 2 at a constant reduction ratio, and a multi-thread screw 8 is attached to the drive shaft 4. The drive gear is mounted on the shaft 5, 5 is a free rotating screw that is screwed onto the end of the drive shaft 4, 6 is a cam guide fixed to the drive shaft 4, 7 is a torsion spring, and 9 is a flange of the brake receiver. Brake plate attached to the portion 11a with the claw wheel 10 interposed therebetween, 11 is a brake receiver which is a pressure receiving member screwed to the load sheave side of the drive shaft 4, 12 is a load sheave, 13 is a side plate supporting the load sheave, Reference numeral 14 denotes a chain, 15 denotes a hook attached to the end of the chain, 16 denotes a handle attached to the rotary shaft 1, 16a denotes an opening provided in the upper part of the handle, and 17 denotes a main body cover. The drive shaft 4 may be integrated with the load sheave or may rotate the load sheave via a speed reducer as in the conventional example shown in FIG.
[0012]
Next, the operation according to the embodiment of the present invention will be described. First, the opening 16a of the handle 16 is attached to the rotating shaft 1, and the rotating shaft 1 is intermittently rotated by the rotating operation of the handle 16. When the rotating shaft 1 rotates, the drive gear 3 that meshes with the rotating gear 2 fixed to the rotating shaft 1 is rotated at a constant reduction ratio. By this rotation operation, the brake member also rotates integrally with the drive gear 3 via the brake plate 9, the brake receiver 11 is pressed against the end surface of the load sheave 12, and the drive gear 3 is tightened by the multi-thread screw 8. Is transmitted to the drive shaft 4 to rotate the load sheave 12.
[0013]
On the other hand, during idle rotation, when the idle gear 5 is pulled out along the cam guide 6 in the axial direction, the drive gear 3 is rotated in the direction opposite to the brake pressure contact direction by the torsion spring 7 at the moment when the idle gear 5 is pulled out. The brake is released. In the above apparatus, the rotation transmission unit other than the rotating shaft 1 and the idle gear 5 is provided in the cover 16.
[0014]
As described above, according to the present embodiment, the handle 16 is not directly attached to the drive gear 3 that rotates the drive shaft 4, but is engaged between the drive gear 3 and the rotary shaft 1 with a constant reduction ratio. Since the rotary gear 2 is provided and the handle 16 is mounted on the rotary shaft 1, the handle 16 can be greatly reduced in size compared to the conventional device, and the handle 16 can be attached and detached very easily. However, since the drive member is concealed in the main body cover 17, the airtightness of the apparatus main body is maintained, and there is a constant distance between the rotary gear 2 fixed to the rotary shaft 1 and the drive gear 3 attached to the drive shaft 4. Since it has a speed reduction function that transmits rotation at a speed reduction ratio, the overall device can be downsized and the number of parts can be greatly reduced compared to a lever hoist device equipped with a conventional speed reduction device. It is possible to provide a bar hoist device.
[0015]
【The invention's effect】
According to the present invention, the rotating gear that meshes with the driving gear at a constant reduction ratio is provided, and the rotating gear is fixed to the rotating shaft on which the handle is mounted, so the handle is directly mounted on the conventional driving gear. Compared with the device, it can be made much smaller, the handle can be attached and detached very easily, and even when the handle is removed, the drive member is concealed in the body cover, so the device body is kept airtight and the rotating shaft Since there is a reduction function that transmits rotation at a constant reduction ratio between the rotation gear fixed to the drive shaft and the drive gear attached to the drive shaft, compared to a lever hoist device equipped with a conventional reduction device, Since the entire apparatus can be reduced in size and the number of parts can be greatly reduced, a low-cost lever hoist apparatus can be provided.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a lever hoist according to the present invention.
FIG. 2 is a front view of the handle of FIG. 1;
FIG. 3 is a longitudinal side view of a conventional lever hoist.
FIG. 4 is a longitudinal side view of a lever hoist of a conventional example.
FIG. 5 is a front view of a handle in a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Rotating gear 3 Driving gear 4 Driving shaft 5 Sliding idle 6 Cam guide 7 Torsion spring 8 Multi-thread screw 9 Brake plate 10 Claw wheel 11 Brake receiver 12 Load sheave 13 Side plate 14 Chain 15 Hook 16 Handle 16a Opening 17 Body cover

Claims (2)

A drive shaft that rotates the load sheave, a drive gear that is mounted on the drive shaft and rotates the drive shaft via a brake plate, a ratchet wheel, and a pressure receiving member; and a pressure receiving member that is provided on the load sheave side of the drive shaft in lever hoists equipped with brake plate mounted across the ratchet wheel to the flange portion of the pressure receiving member, meshed drive gear and at a constant speed reduction ratio, the rotation gear provided to rotate the drive gear, the rotation of the rotary gear lever hoist, characterized in that mounted handles wear detachably to the shaft. 2. The lever hoist according to claim 1, wherein an idle end is provided at an end of the drive shaft so as to advance and retreat along the cam guide and release the connection between the drive gear and the pressure receiving member .

Images