A pulley device with one-way locking function

Abstract

This utility model discloses a pulley device with a one-way locking function, including a support body, a support shaft, a drive shaft, a wheel, and a lever mounted on the support body. An eccentric hole is provided on the drive shaft, through which the drive shaft is rotatably mounted on the support shaft. A stop portion is provided on the support body opposite the wheel, and a clamping channel for the rope to pass through is formed between the stop portion and the groove of the wheel. The size of the clamping channel changes with the rotation of the drive shaft. When using this utility model pulley device to lift heavy objects, after the object is lifted to the target position, the rope is automatically triggered to rotate due to the weight of the object, causing the wheel to move and engage with the stop portion on the support body to clamp the rope. Therefore, no continuous manual pulling or additional auxiliary fixation is required, solving the safety hazard of traditional pulleys that fall upon release.

Description

Technical Field

[0001] This utility model relates to the field of pulley technology, specifically to a pulley device with a one-way locking function. Background Technology

[0002] Common pulleys mainly consist of three parts: a support body, a connecting shaft, and a wheel. Through proper assembly, they can form fixed pulleys, movable pulleys, or pulley systems, achieving labor-saving effects when lifting heavy objects in many fields such as construction and outdoor operations. However, traditional pulleys lack a rope locking structure, leading to limitations and safety hazards in practical applications. For example, after the heavy object is lifted to the target position, because the wheel can rotate freely in both directions, it is necessary to continuously pull the rope end manually, or use additional clips, bindings, or other auxiliary methods to secure the rope, to prevent the heavy object from slipping back under gravity. This not only increases operational complexity and reduces work efficiency but also poses certain safety risks. If manual pulling fails or the auxiliary fixing device malfunctions, it can easily cause the heavy object to fall, threatening the personal safety of workers and surrounding equipment. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a pulley device with a one-way locking function.

[0004] This utility model provides the following technical solution: A pulley device with a one-way locking function includes a support body, a support shaft, a transmission shaft, a wheel, and a lever mounted on the support body; an eccentric hole is provided on the transmission shaft, and the transmission shaft is rotatably sleeved on the support shaft through the eccentric hole; the wheel includes a bearing and a round wheel with an annular groove mounted on the bearing, and the bearing is sleeved on the transmission shaft; an arc-shaped hole is provided on the outer wall of the support body, one end of the lever is connected to the transmission shaft, and the other end of the lever extends outward and is limited in the arc-shaped hole; a stop part is provided on the support body relative to the round wheel, and a clamping channel for a rope to pass through is formed between the stop part and the groove of the round wheel, the size of which changes with the rotation of the transmission shaft.

[0005] Furthermore, the stop portion extends diagonally downward from the opening on one side of the support body and is integrally formed.

[0006] Furthermore, the eccentric hole is located in the area above the central axis of the drive shaft, and the lever is symmetrically positioned in the area below the central axis of the drive shaft relative to the eccentric hole.

[0007] Furthermore, the outer end of the lever is connected to an adjustment handle, and the side wall of the bracket body is integrally formed with a mounting part coaxial with the support shaft, and the adjustment handle is rotatably mounted on the mounting part.

[0008] Furthermore, a rotatable handle is connected to the upper end of the adjusting handle, and a return spring is provided at the connection between the adjusting handle and the handle. The elastic force of the return spring can drive the handle to fold and fit against the adjusting handle.

[0009] Furthermore, the drive shaft includes a first support body, a second support body, and a connecting strip. The first support body and the second support body are symmetrically distributed on both sides of the connecting strip. The wheel body has two bearings, which are respectively interference-fitted onto the outer periphery of the first support body and the second support body. A locking plate and an elastic element are sleeved on the support shaft. The locking plate abuts against the connecting strip, and the elastic element abuts against the locking plate.

[0010] Furthermore, the inner wall of the annular groove of the wheel is provided with anti-slip texture.

[0011] When using the pulley device with one-way locking function of this utility model to lift heavy objects, after the heavy object is lifted to the target position, when the rope is pulled in the opposite direction by the weight of the heavy object, the eccentrically set transmission shaft will be automatically triggered to rotate, causing the wheel to move and cooperate with the stop part on the support to bite the rope. The wheel will no longer continue to rotate in the opposite direction. Therefore, there is no need for continuous manual pulling or additional auxiliary fixation, which reduces the accident of heavy objects falling due to human operation errors or failure of auxiliary devices, and solves the safety hazard of traditional pulleys falling when released. Attached Figure Description

[0012] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration.

[0013] Figure 1 This is a perspective view of a pulley device with a one-way locking function according to the present invention.

[0014] Figure 2 This is an exploded perspective view of a pulley device with a one-way locking function according to the present invention.

[0015] Figure 3 This is an exploded view of the pulley device with one-way locking function of this utility model in use.

[0016] Figure 4 This is an exploded view of another state of use for the pulley device with one-way locking function according to this utility model.

[0017] Figure 5 for Figure 3 This is another exploded perspective view of a pulley device with a one-way locking function according to the present invention.

[0018] In the diagram, 1 is the support body, 2 is the support shaft, 3 is the transmission shaft, 4 is the wheel, 5 is the lever, 30 is the eccentric hole, 40 is the bearing, 41 is the round wheel, 10 is the arc-shaped hole, 11 is the stop part, 7 is the adjusting handle, 12 is the mounting part, 13 is the clamping channel, 8 is the rotating handle, 30 is the first support body, 31 is the second support body, 32 is the connecting bar, and 9 is the locking plate. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0020] like Figure 1 and Figure 2 As shown, the present invention provides a pulley device with a one-way locking function, including a bracket body 1, a support shaft 2, a transmission shaft 3, a wheel body 4, and a lever 5 disposed on the bracket body 1.

[0021] The support shaft 2 is fixedly connected to the two side walls of the bracket body 1 at both ends. An eccentric hole 30 is provided on the transmission shaft 3. The eccentric hole 30 refers to a hole that is opened axially off the center line of the transmission shaft 3. The support shaft 2 passes through the eccentric hole 30 and is clearance-fitted with the inner wall of the eccentric hole 30. The transmission shaft 3 can rotate around the support shaft 2 through the eccentric hole 30. In this embodiment, the eccentric hole 30 is located in the area above the central axis of the transmission shaft 3, and the lever 5 is symmetrically arranged in the area below the central axis of the transmission shaft 3 relative to the eccentric hole 30.

[0022] The wheel body 4 consists of a bearing 40 and a circular wheel 41 with an annular groove. The bearing 40 is fixedly mounted on the drive shaft 3 by an interference fit. The circular wheel 41 is coaxially sleeved on the outside of the bearing 40. The inner wall of the annular groove of the circular wheel 41 is provided with anti-slip texture. An arc-shaped hole 10 is provided on the outer wall of the bracket body 1. One end of the lever 5 is fixedly connected to the drive shaft 3, and the other end of the lever 5 extends outward and is limited in the arc-shaped hole 10. Through the sliding limiting fit between the lever 5 and the arc-shaped hole 10, the rotation angle of the drive shaft 3 is limited to a preset range.

[0023] A stop 11 is provided on the support body 1 at the groove position corresponding to the wheel 41. The stop 11 extends obliquely downward from the left side opening of the support body 1 and is integrally formed. A clamping channel 13 is formed between the stop 11 and the groove of the wheel 41 for the rope to pass through. The size of the clamping channel 13 can change with the rotation of the drive shaft 3 or the different positions of the lever 5 in the arc-shaped hole 10, thereby realizing the tightening or loosening of the rope. The specific working principle is as follows: (See reference) Figure 3In use, the rope passes through the clamping channel 13. Let's define the left side of the rope as the load end suspending the weight, and the right side as the manual pulling end. When the rope is pulled to the right, the pulling force at the operating end is greater than the weight of the load end. This external force is transmitted to the drive shaft 3 through the friction between the rope and the wheel 41, forcing the drive shaft 3 to rotate clockwise around the support shaft 2, causing the center of the wheel 4 to shift to the left. At this time, the lever 5 slides clockwise to the left position within the arc-shaped hole 10, and the clamping channel 13 expands simultaneously, allowing the rope to slide unimpeded to the right, achieving a smooth lifting of the weight. (See reference...) Figure 4 Conversely, when the rope at the operating end is manually released, the load at the load end generates a leftward pulling force under gravity. This pulling force is transmitted to the wheel 41 through the rope, forcing the drive shaft 3 to rotate counterclockwise around the support shaft 2, causing the center of the wheel 4 to shift to the right. At this time, the lever 5 slides counterclockwise to the right position within the arc-shaped hole 10, drastically reducing the size of the clamping channel 13. The stop part 11 and the inner wall of the groove of the wheel 41 together form a bidirectional squeezing clamp on the rope, completely locking the rope's reverse sliding using friction. That is, this device only allows the rope to move in the lifting direction or to the right, preventing the rope from slackening in the falling direction or to the left, thus achieving an automatic one-way locking function.

[0024] Of course, those skilled in the art can easily understand that parameters such as the eccentricity of the eccentric hole 30, the diameter of the drive shaft 3, the groove size of the wheel 41, and the initial or minimum and maximum distance between the stop part 11 and the wheel 41 can be flexibly adapted according to the actual application scenario. It is only necessary to ensure that the clamping channel 13 can achieve the function of not affecting the rope sliding when it is released and reliably clamping the rope when it is locked, thereby deriving pulley device models with different load specifications.

[0025] To enable manual unlocking and facilitate the release of the rope after the load is in place, an adjusting handle 7 is hinged to the outer end of the lever 5. A mounting portion 12, coaxial with the support shaft 2, is integrally formed on the side wall of the support body 1. The adjusting handle 7 is rotatably mounted on the mounting portion 12. When an external force is applied to the adjusting handle 7, it rotates around the axis of the support shaft 2 with the mounting portion 12 as the fulcrum. This rotation causes the lever 5 to slide within the arc-shaped hole 10, thereby manually releasing the locked rope.

[0026] To further enhance the convenience of manual operation, a rotatable handle 8 is connected to the upper end of the adjusting handle 7 via a pivot shaft. The handle 8 serves as an extension lever arm to reduce the operating force. A conventional limiting structure can be installed at the connection between the handle 8 and the adjusting handle 7 to limit the rotation angle of the handle 8 to 0°-180°. Additionally, a torsion spring-type return spring can be installed at the connection. When manual operation is not required, the spring force of the return spring can drive the handle 8 to fold and fit against the adjusting handle 7, reducing the overall space occupied by the device and facilitating storage and transportation. Figure 3 The handle 8 in the diagram represents the state when it is unfolded under force. Figure 4 The handle 8 in the middle is in its natural folded state.

[0027] like Figure 5 As shown, to further optimize the structural stability and locking reliability of the drive shaft 3, the drive shaft 3 is integrally formed from a first support body 30, a second support body 31, and a connecting strip 32. The first support body 30 and the second support body 31 are symmetrically distributed on both sides of the connecting strip 32. The wheel body 4 has two bearings 40, which are respectively installed on the outer periphery of the first support body 30 and the second support body 31 through interference fit, forming a double bearing 40 support structure. A locking plate 9 and an elastic element are also sleeved on the support shaft 2. The locking plate 9 abuts against the connecting strip 32, and the elastic element abuts against the locking plate 9. The elastic element can be a commonly used torsion spring or compression spring. As long as the pre-tightening force of the elastic element in its natural state continuously pushes the locking plate 9 against the connecting strip 32, it forces the drive shaft 3 to remain in the initial locking position, that is, the lever 5 is located on the right side of the arc-shaped hole 10, which can further ensure the reliability of the one-way locking of the rope.

[0028] This embodiment uses the pulley device of this invention in one of the pulleys of a pair of parallel pulleys, but it is not limited to use in a pair of pulleys. Those skilled in the art can adapt it to other different forms of pulley structures according to actual needs or by making adaptive adjustments.

[0029] When using the pulley device with one-way locking function of this utility model to lift heavy objects, after the heavy object is lifted to the target position, when the rope is pulled in the opposite direction by the weight of the heavy object, the eccentrically set transmission shaft 3 will be automatically triggered to rotate and cooperate with the stop part 11 on the support body 1 to bite the rope. The wheel body 4 will no longer continue to rotate in the opposite direction. Therefore, there is no need for continuous manual pulling or additional auxiliary fixation, which reduces the accident of heavy objects falling due to human operation errors or failure of auxiliary devices, and solves the safety hazard of traditional pulleys falling when released.

[0030] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

[0031] In the description of this utility model, it should be understood that if terms such as "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

Claims

1. A pulley device with a one-way locking function, characterized in that: The device includes a support body, a support shaft, a drive shaft, a wheel, and a lever mounted on the support body. An eccentric hole is provided on the drive shaft, which is rotatably mounted on the support shaft through the eccentric hole. The wheel includes a bearing and a circular wheel with an annular groove mounted on the bearing, which is mounted on the drive shaft. An arc-shaped hole is provided on the outer wall of the support body. One end of the lever is connected to the drive shaft, and the other end of the lever extends outward and is confined within the arc-shaped hole. A stop portion is provided on the support body opposite the circular wheel, and a clamping channel for a rope to pass through is formed between the stop portion and the groove of the circular wheel. The size of the clamping channel changes with the rotation of the drive shaft.

2. The pulley device with one-way locking function according to claim 1, characterized in that: The stop portion extends diagonally downward from the opening on one side of the support body and is integrally formed.

3. The pulley device with one-way locking function according to claim 2, characterized in that: The eccentric hole is located in the region above the central axis of the drive shaft, and the lever is symmetrically arranged in the region below the central axis of the drive shaft relative to the eccentric hole.

4. The pulley device with one-way locking function according to claim 3, characterized in that: The outer end of the lever is connected to an adjustment handle, and the side wall of the bracket body is integrally formed with a mounting part coaxial with the support shaft. The adjustment handle is rotatably mounted on the mounting part.

5. The pulley device with one-way locking function according to claim 4, characterized in that: A rotatable handle is connected to the upper end of the adjusting handle, and a return spring is provided at the connection between the adjusting handle and the handle. The elastic force of the return spring can drive the handle to fold and fit against the adjusting handle.

6. The pulley device with one-way locking function according to claim 1, characterized in that: The drive shaft includes a first support body, a second support body, and a connecting bar. The first support body and the second support body are symmetrically distributed on both sides of the connecting bar. The wheel body has two bearings, which are respectively interference-fitted onto the outer periphery of the first support body and the second support body. A locking plate and an elastic element are sleeved on the support shaft. The locking plate abuts against the connecting bar, and the elastic element abuts against the locking plate.

7. The pulley device with one-way locking function according to claim 1, characterized in that, The inner wall of the annular groove of the wheel is provided with anti-slip texture.

Images