Compact lever block

Abstract

The utility model discloses a compact lever block which comprises a shell, a lever block body, a lifting device and a control device. A driving handle is arranged on the outer side of the shell. The chain wheel is arranged in the shell, three chain pits are formed in the chain wheel, and a chain used in cooperation with the chain wheel is arranged on the chain wheel; the main shaft is rotationally arranged on the chain wheel, one end of the main shaft is connected with the driving handle, and the main shaft is used for driving the chain wheel to rotate; the transmission gear set comprises a first gear and a second gear, a third gear is installed on one side of the second gear, the other end, provided with the driving handle, of the main shaft penetrates through the first gear and is provided with a fourth gear, the fourth gear is meshed with the second gear, the third gear is meshed with the first gear, and the third gear is meshed with the second gear. And the transmission gear set is used for transmitting the rotating force of the main shaft to the chain wheel.

Description

Technical Field

[0001] The present application relates to the technical field of lever hoists, and in particular to a compact lever hoist. Background Art

[0002] Lever hoists, as a tool for lifting heavy objects, are often encountered in various production scenarios where heavy objects need to be lifted. In situations where large lifting machinery is difficult to access, smaller and more portable lever hoists are usually the first choice for lifting. Lever hoists are driven by gear sets with different numbers of teeth, allowing heavier objects to be lifted with less force.

[0003] The existing lever hoist maintains a double-gear structure on the transmission gear. After driving the two plate gears through a multi-foot long shaft, the four-tooth short shaft coaxial with the plate gears is driven to rotate, thereby affecting the spline gear connected to the sprocket. However, the double-gear structure accounts for a high proportion of the weight of the lever hoist, which is undoubtedly a major obstacle to reducing the weight and volume of the lever hoist. In addition, conventional sprockets often contain four chain holes, which will make the sprocket wrapped. Therefore, how to effectively reduce the weight and volume of the lever hoist is the purpose of this application.

[0004] The above content is only used to assist in understanding the technical solution of this application, and does not mean that the above content is the closest prior art to this application. Summary of the Invention

[0005] Based on this, the present application provides a compact lever hoist to solve one of the above technical problems.

[0006] The technical solution adopted by the present application to solve its technical problem is a compact lever hoist, comprising: a shell, a driving handle is provided on the outside of the shell; a sprocket is provided inside the shell, three chain holes are provided on the sprocket, and a matching chain is provided on the sprocket; a main shaft is rotatably provided on the sprocket, one end of the main shaft is connected to the driving handle, and is used to drive the sprocket to rotate; a transmission gear set, comprising a first gear and a second gear, a third gear is installed on one side of the second gear, the other end of the main shaft where the driving handle is provided passes through the first gear and a fourth gear is provided at this end, the fourth gear is meshed with the second gear, and the third gear is meshed with the first gear. The transmission gear set is used to transmit the force of the main shaft rotation to the sprocket.

[0007] In some embodiments, a special-shaped protrusion is provided in the chain nest.

[0008] In some embodiments, a spline is provided on one side of the sprocket, and a spline groove is provided at the center of the first gear to cooperate with the spline.

[0009] In some embodiments, the number of teeth and the diameter of the first gear are greater than the number of teeth and the diameter of the third gear.

[0010] In some embodiments, the number of teeth and the diameter of the second gear are greater than the number of teeth and the diameter of the fourth gear.

[0011] In some embodiments, the contour of the chain pocket matches the outer contour of the chain.

[0012] The beneficial effect of the present application is that, by improving the double-gear structure, the present application uses only one gear to complete the function of the driving sprocket, effectively reducing the impact of the driving structure on the weight and volume of the hand hoist, and compared with the conventional sprocket, one less chain nest is provided, so that the overall volume of the chain is further reduced when it is stored on the sprocket. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 It is a schematic diagram of the main structure of this application.

[0015] Figure 2 It is an exploded schematic diagram of the transmission gear set of this application.

[0016] Figure 3 It is a schematic diagram of the three-dimensional structure of the sprocket of this application.

[0017] Figure 4 It is a cross-sectional schematic diagram of this application.

[0018] Explanation of the accompanying figures: 1. Housing; 11. Driving handle; 2. Sprocket; 21. Chain; 22. Chain nest; 23. Special-shaped protrusion; 24. Spline; 3. Main shaft; 31. Fourth gear; 4. Transmission gear set; 41. First gear; 411. Spline groove; 42. Second gear; 421. Third gear. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection of this application.

[0020] In the examples of this application, please refer to Figure 1-4 As shown, the present application provides a compact lever hoist, which mainly includes: a shell 1, a driving handle 11 is provided on the outside of the shell 1; a sprocket 2, which is arranged inside the shell 1, and three chain holes 21 are provided on the sprocket 2, and a matching chain is provided on the sprocket 2; a main shaft 3, which is rotatably arranged on the sprocket 2, and one end of the main shaft 3 is connected to the driving handle 11, for driving the sprocket 2 to rotate; a transmission gear group 4, including a first gear 41 and a second gear 42, and a third gear 421 is installed on one side of the second gear 42, the other end of the main shaft 3 where the driving handle 11 is provided passes through the first gear 41 and a fourth gear 31 is provided at this end, the fourth gear 31 is meshed with the second gear 42, and the third gear 421 is meshed with the first gear 41, and the transmission gear group 4 is used to transmit the force of the rotation of the main shaft 3 to the sprocket 2.

[0021] Specifically, the main shaft 3 is rotated by driving the handle 11. The main shaft 3 is set at the center position of the sprocket 2, so the main shaft 3 can rotate relative to the first gear 41, so that the rotation of the main shaft 3 does not interfere with the first gear 41 and the sprocket 2, and effectively utilizes the space. The rotation of the main shaft 3 will drive the second gear 42 engaged with the fourth gear 31, and the second gear 42 drives the third gear 421 installed on one side thereof. The third gear 421 is connected to the first gear 41, driving the first gear 41 to rotate, so that when the main shaft 3 rotates, the sprocket 2 is driven to rotate synchronously.

[0022] Furthermore, only three chain pockets 21 are provided on the sprocket 2, which can effectively change the outer diameters of the two chains when stored, thereby further reducing the volume.

[0023] Some preferred / improved embodiments based on the above embodiments will be described below. Any one of the following embodiments may be selected, or multiple embodiments may be selected and combined.

[0024] Reference Figure 2 and Figure 3As shown, a special-shaped protrusion 23 is provided in the chain nest 21. The existence of the special-shaped protrusion 23 enables the chain nest 21 to effectively fit into the gap between the chains when accommodating the chain, and cooperate with the periphery of the chain nest 21 to effectively limit the chain.

[0025] Specifically, in order to enable the first gear 41 to drive the sprocket 2 , a spline 24 is provided on one side of the sprocket 2 , and a spline groove 411 cooperating with the spline 24 is opened at the center of the first gear 41 .

[0026] Furthermore, to optimize the transmission effect between the main shaft 3 and the sprocket 2, the number of teeth and the diameter of the first gear 41 are greater than those of the third gear 421. The number of teeth and the diameter of the second gear 42 are greater than those of the fourth gear 31.

[0027] Preferably, the contour of the chain nest 21 matches the outer contour of the chain, so that the chain can be engaged in the chain nest 21 in an orderly manner, reducing the volume problem caused by random stacking of chains.

[0028] Thus far, various embodiments of the present application have been described in detail. To avoid obscuring the concept of the present application, some details well known in the art have not been described. Based on the above description, those skilled in the art will fully understand how to implement the technical solutions disclosed herein.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present application, and the aforementioned embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not drive the essence of the corresponding technical solutions away from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A compact lever hoist, characterized in that: include: A housing, wherein a driving handle is provided on the outer side of the housing; A sprocket is arranged inside the housing, the sprocket is provided with three chain pockets, and the sprocket is provided with a matching chain; A main shaft is rotatably mounted on the sprocket, one end of the main shaft being connected to the driving handle for driving the sprocket to rotate; The transmission gear set includes a first gear and a second gear. A third gear is installed on one side of the second gear. The other end of the main shaft where the driving handle is set passes through the first gear and a fourth gear is set on this end. The fourth gear is engaged with the second gear, and the third gear is engaged with the first gear. The transmission gear set is used to transmit the force of the main shaft rotation to the sprocket.

2. A compact lever hoist according to claim 1, characterized in that: A special-shaped protrusion is arranged in the chain nest.

3. A compact lever hoist according to claim 1, characterized in that: A spline is provided on one side of the sprocket, and a spline groove matching the spline is opened at the center of the first gear.

4. A compact lever hoist according to claim 1, characterized in that: The number of teeth and the diameter of the first gear are greater than the number of teeth and the diameter of the third gear.

5. The compact lever hoist according to claim 1, characterized in that: The number of teeth and the diameter of the second gear are greater than the number of teeth and the diameter of the fourth gear.

6. The compact lever hoist according to claim 1, characterized in that: The contour of the chain pocket matches the outer contour of the chain.

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