A hand chain hoist height adjuster

Abstract

The present application relates to hand chain hoist auxiliary tool technical field, specifically disclose a kind of hand chain hoist lifting height regulator, including shell and sprocket, sprocket is circumferentially equipped with the chain groove matching with the shape of hand chain; sprocket is rotatably installed in the inside of shell by shaft sleeve, and shaft sleeve is axially equipped with polygonal shaft hole or polygonal shaft;It further includes the rack for limiting hand chain in chain groove, and the passage is formed between rack and chain groove, which is passed from top to bottom by hand chain, and the shell side is detachably connected with rack.The present application is used by cooperating power device, saves manpower cost, simultaneously speeds up the speed of lifting or descending goods, reduces time cost.

Description

Technical Field

[0001] This application relates to the field of auxiliary tools for hand chain hoists, and specifically discloses a lifting height adjuster for hand chain hoists. Background Technology

[0002] A hand chain hoist is a simple and portable manual lifting machine. Typically, a person manually pulls the chain clockwise to rotate the hand chain wheel. When lowering an object, the person typically pulls the chain counter-clockwise, causing the brake seat and brake pads to separate, the ratchet to stop under the action of the pawl, and the five-toothed long shaft to drive the lifting chain wheel in the opposite direction. During these operations, if the object needs to be lifted or lowered a long distance, manually pulling the chain requires a significant amount of manpower.

[0003] In response, existing technologies, such as the invention with publication number CN 204802910 U—a hand-cranked chain hoist—provide a labor-saving solution for hand-operated chain hoists. The solution includes a drive wheel, a driven wheel, a pin, a bracket, a hand crank, and a chain hoist. The drive wheel and driven wheel are mounted on the bracket via the pin. Sprockets are provided on the edges of the drive wheel and driven wheel. The hand crank is mounted on the pin of the drive wheel. The lower end of the bracket is hook-shaped for easy gripping or hooking onto a fixed object. In use, the chain hoist is wound around the drive wheel and driven wheel in the direction required to be pulled, forming an S-shape. One hand holds or secures the hook at the lower end of the bracket, while the other hand cranks the hand crank to rotate the drive wheel via the pin, thus pulling the chain hoist. Simultaneously, the driven wheel rotates while pressing against the chain hoist, ensuring normal operation. After pulling, the chain hoist is removed to complete the operation.

[0004] The aforementioned hand crank for chain hoists requires the device to be fixed in a certain place before it can be easily cranked by hand. The installation is complicated and the applicability is not strong. Moreover, the device still requires manual cranking. If it is necessary to lift or lower an object a long distance, it will consume a lot of manpower and time. Therefore, there is an urgent need for a device that can solve the above problems. Summary of the Invention

[0005] To address the problems of limited applicability of existing hand cranks, the need for manual cranking, and the time and labor involved, this invention provides a hand chain hoist lifting height adjuster that can be installed immediately upon use, is easy to operate, saves labor costs, and speeds up the lifting or lowering of items, thus reducing time costs.

[0006] To achieve the above objectives, the basic solution of the present invention provides a lifting height adjuster for a hand chain hoist: it includes a housing and a sprocket, the sprocket having a circumferentially oriented chain groove matching the shape of the hand chain; the sprocket is rotatably mounted inside the housing via a bushing, the bushing having an axially oriented polygonal shaft hole or polygonal shaft; it also includes a mechanism for adjusting the lifting height of the hand chain.

[0007] The frame is located within the chain groove, and a channel is formed between the frame and the chain groove, allowing the hand-operated chain to pass through from top to bottom. One side of the housing is detachably connected to the frame, and a chain hole is provided at the junction of the housing and the top of the frame. The chain hole is cross-shaped.

[0008] Furthermore, a limiting groove matching the shape of one side of the frame is provided on one side of the housing. The limiting groove extends towards the bottom of the housing to form a support part, and the channel is the gap between the limiting groove and the chain groove.

[0009] Furthermore, when the housing is snapped into the frame and in the connected state, the housing is placed in a limiting groove above the support.

[0010] Furthermore, a vertically arranged locking strip is provided on the side of the housing near the frame, and a locking groove is provided on the frame to cooperate with the locking strip. The locking strip on the housing can be inserted into the locking groove on the frame, and a limiting structure is also provided on the frame to seal the opening of the locking groove.

[0011] Furthermore, the limiting structure includes a slide groove on the frame, a first slider in the slide groove, one end of the first slider being connected to a spring, and the other end of the spring being fixed in the slide groove; the first slider can extend to the opening of the slot under the action of the spring.

[0012] Furthermore, a second slider is provided on the outside of the slide groove, and the second slider is connected to the first slider through a connecting post.

[0013] Furthermore, the upper part of the first slider near the slot is set as an inclined surface.

[0014] Furthermore, the bushing is provided with a limiting protrusion in the circumferential direction, and the sprocket is keyed to the bushing.

[0015] Furthermore, the limitation also includes a handle, the top of which is connected to the frame.

[0016] Furthermore, the specification also includes a motor for driving the chain groove to rotate.

[0017] Compared with the prior art, the advantages of this invention are:

[0018] In this invention, the hand chain is placed in the chain groove of the sprocket, and the housing and frame are assembled together, so that the limiting groove of the frame and the chain groove of the housing form a channel for the hand chain to pass through. The rotation of the bushing drives the sprocket to rotate, thereby driving the hand chain in the chain groove to move quickly. Since the hand chain hoist drives the lifting chain to raise or lower the object by pulling the hand chain, this housing, in conjunction with the power device, can quickly move the hand chain to achieve the effect of raising or lowering the object in a time-saving and labor-saving manner. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a schematic diagram of the lifting height adjuster of the hand chain hoist in this invention;

[0021] Figure 2 This is a schematic diagram of the sprocket structure of the lifting height adjuster of the hand chain hoist in this invention;

[0022] Figure 3 This is a schematic diagram of the bushing structure of the lifting height adjuster of the hand chain hoist in this invention;

[0023] Figure 4 This is a schematic diagram of the frame structure of the hand chain hoist lifting height adjuster in this invention;

[0024] Figure 5 This is a partially enlarged view of the limiting structure of the lifting height adjuster of the hand chain hoist in this invention;

[0025] Figure 6 This is a schematic diagram of the lifting height adjuster of the hand chain hoist in this invention, without the handle and frame.

[0026] Figure 7 This is a schematic diagram of the lifting height adjuster of the hand chain hoist in this invention, with the handle and part of the frame removed.

[0027] Figure 8 This is a schematic diagram of the electric control sprocket of the lifting height adjuster of the hand chain hoist in this invention;

[0028] Figure 9 for Figure 8 Schematic diagram of the transmission structure of the electric control sprocket;

[0029] Figure 10 This is a schematic diagram of another structure of the electric control sprocket of the lifting height adjuster of the hand chain hoist in this invention;

[0030] The reference numerals in the accompanying drawings of the instruction manual include: 1. Handle; 2. Housing; 3. Chain hole; 4. Bushing; 5. Sprocket; 6. Frame; 7. Limiting structure; 8. Slide groove; 9. First slider; 10. Spring; 11. Anti-slip protrusion; 12. Connecting post; 13. Second slider; 14. Positioning screw; 15. Chain groove; 16. Polygonal shaft hole; 17. Limiting groove; 18. Support part; 19. Locking bar; 20. Locking groove; 21. Limiting protrusion; 22. Motor; 23. Battery; 24. End face tooth; 25. Output end. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] This invention provides a lifting height adjuster for a hand chain hoist, comprising a housing 2 and a sprocket 5, wherein the sprocket 5 is provided with a chain groove 15 circumferentially matching the shape of the hand chain; specifically, as shown in the figure... Figure 2 As shown, the chain groove 15 includes two types of grooves: a horizontal groove and a vertical groove. The horizontal groove and the vertical groove are staggered along the circumference of the sprocket 5 to form irregular grooves that match the chain links of the hand chain. This allows the horizontal chain links of the hand chain to mesh with the horizontal groove, and the vertical chain links of the hand chain to mesh with the vertical groove. As a result, when the sprocket 5 rotates, it can drive the hand chain meshed on the chain groove 15 to move quickly.

[0033] The sprocket 5 and the bushing 4 can be connected as one piece or separately; the one-piece connection is equivalent to having a chain groove 15 directly opened on the bushing 4; the separate connection means that the sprocket 5 is rotatably installed inside the housing 2 through the bushing 4. Preferably, the bushing 4 is provided with a limiting protrusion 21 in the circumference, and the sprocket 5 is keyed to the bushing 4.

[0034] The bushing 4 has a polygonal shaft hole 16 or a polygonal shaft inside, which is used to connect a power device. The specific power device can be an electric wrench. When in use, the drill bit of the electric wrench is inserted into the polygonal shaft hole 16 or the drill bit is sleeved on the polygonal shaft.

[0035] Preferred, such as Figures 8 to 10 As shown, this application also includes a motor 22 for driving the chain groove 15 to rotate. The driving scheme can be that the output end 25 of the motor 22 is connected to the bushing 4, the motor 22 drives the output end 25 to rotate, thereby driving the bushing 4 to rotate, and the bushing 4 rotates, thereby driving the chain groove 15 to rotate; or the motor 22 is placed inside the housing 2, the frame is connected to the handle 1, the battery 23 is placed in the handle 1, the motor 22 is electrically connected to the battery 23, and an end face tooth 24 is provided around the side of the chain groove 15. The side of the output end 25 of the motor 22 meshes with the end face tooth 24, and the motor 22 drives the output end 25 to rotate, thereby driving the chain groove 15 to rotate.

[0036] The housing 2 is detachably connected to the frame 6 and has a raised strip on its upper part. The handle 1 has an anti-slip strip. The raised strip on the upper part of the housing 2, together with the anti-slip strip on the handle 1, facilitates the user's disassembly and assembly of the adjuster. After the adjuster is assembled, it works with the chain groove 15 in the sprocket 5 to limit the position of the hand chain, preventing the hand chain from getting misaligned and stuck. The hand chain is placed according to the shape of the chain groove 15 on the sprocket 5. Since the sprocket 5 is fixedly connected to the bushing 4, the rotation of the bushing 4 can drive the sprocket 5 to rotate. The rotation of the sprocket 5 causes the hand chain between the chain groove 15 and the frame to move continuously.

[0037] In practical use, the lifting or lowering of objects using a manual chain hoist is generally achieved by manually pulling the chain to raise or lower the hook. Taking the 622 type manual chain hoist as an example, moving the hook position by 1m requires pulling the chain 40m for a 1t hoist, 74m for a 2t hoist, 175m for a 5t hoist, 351m for a 10t hoist, and 1052m for a 30t hoist. According to experiments conducted by staff, pulling the chain 351m takes 3 minutes and 13 seconds, demonstrating that manually pulling the chain to raise or lower objects is extremely labor-intensive and time-consuming. To address this, this application provides a lifting height adjuster for a manual chain hoist. The user places the chain on the chain groove 15 of the sprocket 5. Due to the limiting effect of the frame 6 on the outer side of the sprocket 5, the chain links can engage with the chain groove 15. The drive unit of the power device is then inserted into the polygonal shaft hole 16 of the bushing 4, or the drive unit is fitted onto the polygonal shaft. The user holds the housing 2 and starts the power unit or motor. The drive unit or rotating shaft rotates, causing the bushing 4 to rotate. The bushing 4 rotates, causing the sprocket 5 to rotate. Since the chain links of the hand chain placed in the chain groove 15 mesh with the chain groove 15, the sprocket 5 rotates, causing the hand chain in the chain groove 15 to move quickly. Since the hand chain hoist drives the lifting chain to raise or lower objects by pulling the hand chain, this housing 2, when used with the power unit, can quickly move the hand chain, thereby achieving the effect of raising or lowering objects in a time-saving and labor-saving manner. It is especially suitable for light-load or unloaded working conditions.

[0038] Specifically, such as Figure 4 As shown, the frame 6 comprises two parts. The first part is a limiting groove 17 on one side of the frame 6, which matches the shape of one side of the housing. The limiting groove 17 extends towards the bottom of the housing 2 to form a support part 18. The second part is a transverse part extending laterally from the upper part of the frame. With the limiting groove 17 on one side of the frame 6, when the frame 6 and housing 2 are in a separate state, the hand chain is placed into the chain groove 15 to connect the frame 6 and housing 2. A channel is formed between the limiting groove 17 and the chain groove 15, allowing the hand chain to pass through. The limiting groove 17 extends towards the bottom of the housing 2 to form the support part 18, ensuring that the hand chain can move quickly within the channel formed between the chain groove 15 and the limiting groove 17, preventing the hand chain from getting stuck while moving in the channel.

[0039] The frame 6 and the housing 2 are detachably connected, specifically by a snap-fit ​​connection. Option 1 involves a vertically positioned locking strip 19 on the side of the housing 2 closest to the frame 6, with a corresponding locking groove 20 on the frame 6. The locking strip 19 on the housing 2 can be snapped into the groove 20 on the frame 6, allowing the frame 6 and housing 2 to slide relative to each other for a snap-fit ​​fixation. Option 2 also involves a vertically positioned locking strip 19 on the side of the frame 6 closest to the housing 2, with a corresponding locking groove 20 on the housing 2. The locking strip 19 on the frame 6 can be snapped into the groove 20 on the housing 2, allowing the frame 6 and housing 2 to slide relative to each other for a snap-fit ​​fixation. Simultaneously, the frame 6 also features a limiting structure 7 that seals the opening of the locking groove 20, ensuring a secure connection between the frame 6 and housing 2 and preventing relative sliding that could lead to separation or detachment.

[0040] The limiting structure 7 is installed on the transverse part of the frame. The limiting structure 7 can include a slide groove 8 and a spring 10 set on the frame. A first slider 9 is installed on the slide groove 8, and one end of the spring 10 is sleeved at the tail of the first slider 9. The other end of the spring 10 abuts against the tail end of the slide groove 8. In the initial state, the elastic force of the spring 10 causes the first slider 9 to extend forward from the slide groove 8 and block the opening of the slot 20, so that the housing 2 and the frame 6 cannot slide relative to each other, thereby fixing the housing 2 and the frame 6. When it is necessary to separate the housing 2 and the frame 6, the first slider 9 on both sides is pinched and moved backward. The first slider 9 moves along the slide groove 8 and compresses the spring 10, so that the opening of the slot 20 is unobstructed. The housing 2 or the frame 6 is separated by sliding upward. The limiting structure 7 has a simple structure and can conveniently and quickly fix or disassemble the housing 2 and the frame 6.

[0041] Preferred, such as Figure 2 and Figure 4 As shown, the limiting structure 7 also includes a second slider 13, a connecting post 12, and a positioning screw 14. The second slider is located on the outside of the slide groove 8 and is connected to the first slider 9 through the connecting post 12. The positioning screw 14 is fixed by passing vertically through the tail end of the slide groove 8. One end of the spring 10 is sleeved on the tail end of the first slider 9, and the other end of the spring 10 abuts against the positioning screw 14. In the initial state, the elastic force of the spring 10 drives the first slider 9 to extend forward from the slide groove 8 and block the opening of the slot 20, so that the housing 2 and the frame 6 cannot slide relative to each other, thereby fixing the housing 2 and the frame 6. When it is necessary to separate the housing 2 and the frame 6, the second slider 13 on both sides is pinched and moved backward. Since the second slider 13 is connected to the first slider 9 through the connecting post 12, the second slider 13 drives the first slider 9 to move along the slide groove 8 to compress the spring 10, so that there is no obstruction at the opening of the slot 20. By moving the frame 6 or the housing 2 upward, the housing 2 and the frame 6 can be separated. The limiting structure 7 has a simple structure and can conveniently and quickly fix or separate the housing 2 and the frame 6. Meanwhile, in order to facilitate the user's movement of the first slider 9, anti-slip protrusions 11 are provided on the surface of the second slider 13.

[0042] Prioritized by the design, the upper part of the first slider 9 near the slot 20 is sloped. When the housing 2 and frame 6 are fixed together via a sliding connection from their separated state, the retaining bar 19 moves downwards to contact the sloped end of the first slider 9, pushing the first slider 9 back into the slot 8. The retaining bar 19 moves downwards within the slot 20, during which time it abuts against the first slider 9. Once the retaining bar 19 is fully engaged in the slot 20, with no object pressing against it, the first slider 9 springs out due to spring force, sealing the opening of the slot 20, thus fixing the housing 2 and frame 6. This eliminates the need for the user to first open the limiting structure 7 before sliding the housing 2 or frame 6 together, making the connection between the housing 2 and frame 6 more convenient.

[0043] Preferably, in order to facilitate the insertion of the hand chain into the chain groove 15, a chain hole 3 is provided at the junction of the housing 2 and the top of the frame 6. The bottom of the chain hole 3 is connected to the chain groove 15. At the same time, in order to adapt to the shape of the hand chain of the hand chain hoist, the chain hole 3 is designed as a cross shape.

Claims

1. A hoist height adjuster for a hand chain hoist, characterised in that: The utility model relates to a hand-pulled chain limiting device, including shell (2) and sprocket (5), sprocket (5) circumferential direction is equipped with with the hand-pulled chain strip shape matching chain groove (15), sprocket (5) is rotatably installed in the inside of shell (2) through the shaft sleeve (4), the shaft sleeve (4) axial direction is equipped with polygonal shaft hole (16) or polygonal shaft, still including the frame (6) for limiting the hand-pulled chain strip in chain groove (15), the frame (6) is formed with the passageway that can supply the hand-pulled chain strip from top to bottom to pass through between chain groove (15), shell (2) one side with frame (6) detachable connection, shell (2) with the top of frame (6) joint place is equipped with chain hole (3), chain hole (3) is cross-shaped, Chain groove (15) includes horizontal groove and vertical groove two kinds of grooves, horizontal groove and vertical groove staggered interval arrangement along sprocket (5) circumferential direction, form the special-shaped groove that matches the hand-pulled chain link, the horizontal link of hand-pulled chain is engaged with horizontal groove, and the vertical link of hand-pulled chain is engaged with vertical groove, One side of frame (6) is equipped with with the shape matching limiting groove (17) of one side of shell (2), limiting groove (17) extends to the direction of the bottom of shell (2) and constitutes the supporting portion (18), and the passageway is the gap between limiting groove (17) and chain groove (15); One side of shell (2) near frame (6) is equipped with with the vertical setting clamping strip (19), and frame (6) is equipped with with the clamping groove (20) of clamping strip (19) cooperation, and the clamping strip (19) on shell (2) can be clamped into the clamping groove (20) on frame (6), and frame (6) is further equipped with with the limiting structure (7) that can seal the slot mouth of clamping groove (20).

2. The hand chain hoist lift height adjuster of claim 1, wherein: Shell (2) and frame (6) are connected, and shell (2) is placed in the limiting groove (17) on the supporting portion (18).

3. The hand chain hoist height adjuster according to claim 1 or 2, characterized in that: Limiting structure (7) includes the sliding slot (8) of setting on frame, the first sliding block (9) in sliding slot (8) is equipped with, one end of first sliding block (9) is connected spring (10), and the other end of spring (10) is abutted to the tail end of sliding slot (8);First sliding block (9) can extend to the slot mouth of clamping groove (20) under the action of spring (10).

4. The hand chain hoist lift height adjuster of claim 3, wherein: Second sliding block (13) is equipped outside sliding slot (8), and second sliding block (13) is connected with first sliding block (9) through connecting column (12).

5. The hand chain hoist lift height adjuster of claim 4, wherein: The upper portion of one end of first sliding block (9) near clamping groove (20) is inclined surface setting.

6. The hand hoist lift height adjuster of claim 1, 2, 4 or 5, wherein: Shaft sleeve (4) circumferential direction is equipped with with the limiting protrusion (21) of setting, and sprocket (5) is keyed to shaft sleeve (4).

7. The hand hoist lift height adjuster of claim 1, 2, 4 or 5, wherein: Further including handle (1), and handle (1) top is connected with frame (6).

8. The hand hoist lift height adjuster of claim 1, 2, 4 or 5, wherein: Further including motor (22) for driving chain groove (15) rotation.

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