A pulley block safety hook
By designing the telescopic mechanism, guide wheel, and locking mechanism of the safety hook of the pulley block, the problem of low operating efficiency of traditional safety belts on track profiles is solved, achieving a stable connection and smooth movement, and improving operational safety and convenience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG POWER TRANSMISSION & TRANSFORMATION ENG
- Filing Date
- 2025-05-29
- Publication Date
- 2026-06-02
AI Technical Summary
Traditional safety belt fixing methods are inefficient on long-distance rail profiles, requiring frequent unfastening and refastening which is time-consuming and laborious, and pose safety hazards. They are also prone to loose connections, inconvenient to move, and lack reliable locking, thus threatening the safety of workers.
Design a safety hook for a pulley block, comprising a telescopic mechanism, guide wheels, a hook-up component, and a locking mechanism. The distance is adjusted by the telescopic mechanism, the guide wheels are embedded in the groove of the track profile, and the automatic opening and locking are achieved by using an elastic reset component and a locking rod to ensure a stable connection.
It improves the safety and convenience of working on the track profile, ensures a stable connection and smooth movement, and avoids the instability and safety hazards of traditional devices.
Smart Images
Figure CN224307705U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of safety protection equipment technology, and in particular relates to a safety hook for pulley blocks. Background Technology
[0002] With the acceleration of industrialization and the continuous development of urban construction, high-altitude operations, track inspections, and mobile operations in specific industrial environments are increasing. Ensuring the personal safety of workers in these work scenarios is paramount. Traditional safety measures typically include using safety belts with fixed anchor points or simple hooks. However, when workers need to move linearly along long distances on U-shaped channel steel, C-shaped steel, or other similar track profiles, the traditional fixed anchor point method proves inefficient. Workers need to frequently unfasten and refasten their safety belts, which is not only time-consuming and laborious but also prone to safety hazards during the unfastening and refastening intervals. Furthermore, in actual construction, workers often experience reduced work efficiency due to safety belt hooks not being fully or securely engaged in the track, or hooks being difficult to move or prone to jamming. More seriously, these defects directly threaten the lives of workers. Utility Model Content
[0003] The purpose of this utility model is to address the aforementioned shortcomings by providing a safety hook for pulley blocks. This application aims to provide a novel safety hook for pulley blocks that, through its unique telescopic guide wheel embedding, elastic reset tensioning, and rotational locking mechanism, effectively solves the technical problems of weak connection, inconvenient movement, lack of reliable locking, insufficient safety, and low operational efficiency in existing technologies, thereby significantly improving the safety and convenience of working on rail profiles.
[0004] A safety hook for a pulley block includes:
[0005] A telescopic mechanism for adjusting the distance between its two ends;
[0006] At least two guide wheels are provided, each of which is rotatably disposed at one end of the telescopic mechanism, and the guide wheels are adapted to be embedded in the grooves of the track profile.
[0007] A mounting bracket, connected to the telescopic mechanism, is used to connect a safety tether; and
[0008] A locking mechanism is provided to lock the telescopic mechanism in its telescopic state, thereby limiting the distance between the two ends of the telescopic mechanism.
[0009] Furthermore, the telescopic mechanism includes a first component and a second component, at least a portion of the second component being slidably accommodated inside the first component, and the first component and the second component being slidable relative to each other to adjust the distance between their distal ends.
[0010] Furthermore, the guide wheels are rotatably disposed at the distal ends of the first component and the second component, respectively.
[0011] Furthermore, the safety hook also includes an elastic reset member disposed between the first member and the second member, for driving the first member and the second member to separate from each other when the telescopic mechanism is in its natural state, so that the guide wheel tends to open to an extended state for engaging with the groove of the track profile.
[0012] Furthermore, the elastic reset member is disposed in the internal cavity of the first member and acts on the end or shoulder of the second member to apply an elastic thrust to the second member, causing it to extend outward relative to the first member.
[0013] Furthermore, a limiting member is radially provided on the second component, and a guide groove is provided on the first component to cooperate with the limiting member. The limiting member cooperates with the guide groove to limit the maximum extension stroke of the second component relative to the first component and guide its axial sliding.
[0014] Furthermore, the hook-on is rigidly connected to the first component and is used to connect the safety tether; the hook-on is provided with an abutment surface, which is a recessed structure or a sloping structure, for interlocking with the locking mechanism.
[0015] Furthermore, the locking mechanism includes a locking rod operably connected to the second component. The locking rod is adapted to lock the telescopic mechanism by rotating and abutting against the abutting surface on the hook-up member after the telescopic mechanism is in the extended state and the guide wheel is engaged in the groove of the track profile, using the pre-tightening force of the elastic reset member.
[0016] Furthermore, the safety hook also includes an operating handle, which is fixedly connected to the second component; one end of the locking rod is pivotally connected to the operating handle.
[0017] Furthermore, when the guide wheel of the safety hook of the pulley block is placed inside the track profile and the locking mechanism is in the unlocked state, the elastic reset member drives the second component to extend outward relative to the first component, so that the guide wheels at both ends abut against and embed into the grooves of the inner wall of the track profile under the action of elastic thrust; when the locking mechanism locks the telescopic mechanism in the extended state, the contact between the locking rod and the abutment surface prevents the first component and the second component from retracting relative to each other, thereby firmly holding the guide wheel in the groove of the track profile.
[0018] The beneficial effects of this utility model are:
[0019] This utility model provides a safety hook for a pulley system, which includes a telescopic mechanism and rotatable guide wheels at both ends. This allows the safety hook to easily adapt to and embed into grooves of track profiles of different specifications or open states. The guide wheels automatically open and tightly fit into the track groove after the external force is released, ensuring the initial stability of the connection between the hook and the track and the smoothness of movement. The hook-on piece set on the telescopic mechanism provides a reliable connection point for the safety tether, and the abutment surface further provided on it is the key structural basis for effective locking. When the guide wheel is engaged in the track groove and the telescopic mechanism is in the extended state, the locking rod linked to the second component is rotated to abut against the abutment surface on the hook-on piece, so that the telescopic mechanism is firmly locked in the extended state. This effectively prevents the risk of the hook retracting or falling out of the track when disturbed by external force or when the operator moves accidentally. This locking method is not only relatively simple in structure and convenient to operate, but also provides the ability to stay stably at the work point, avoiding the instability of traditional sliding devices when precise positioning or resistance to sudden external forces is required. Attached Figure Description
[0020] Figure 1 Isometric drawing of the safety hook of the pulley block;
[0021] Figure 2 Exploded view of the safety hook for the pulley block;
[0022] Figure 3 Front view of the safety hook of the pulley block;
[0023] Figure 4 Side view of the safety hook of the pulley block;
[0024] Figure 5 Top view of the safety hook of the pulley block;
[0025] Reference numerals: 1. Safety hook; 10. Telescopic mechanism; 101. First component; 1011. Guide groove; 102. Second component; 1021. Limiting component; 20. Guide wheel; 30. Hanging component; 301. Abutment surface; 40. Locking mechanism; 401. Locking rod; 402. Operating handle; 50. Elastic reset component. Detailed Implementation
[0026] The following detailed description of a pulley block safety hook according to the present invention, in conjunction with embodiments, is provided. For the sake of simplicity, this document cannot exhaustively list all alternative technical features and implementation schemes included in the present invention. Therefore, those skilled in the art should understand that any technical feature and implementation scheme within this embodiment does not limit the scope of protection of the present invention, which includes all alternative technical features and implementation schemes adopted by those skilled in the art without inventive effort. Specifically, any implementation scheme obtained by replacing any technical feature in the present invention or by combining any two or more technical features provided by the present invention should be within the scope of protection of the present invention.
[0027] This embodiment provides a safety hook 1 for a pulley block, including:
[0028] Telescopic mechanism 10, which is used to adjust the distance between its two ends;
[0029] At least two guide wheels 20 are rotatably disposed at both ends of the telescopic mechanism 10, and the guide wheels 20 are adapted to be embedded in the grooves of the track profile;
[0030] The mounting bracket 30, connected to the telescopic mechanism 10, is used to connect the safety tether; and
[0031] The locking mechanism 40 is used to lock the telescopic state of the telescopic mechanism 10 to limit the distance between the two ends of the telescopic mechanism 10.
[0032] In one specific embodiment, a specific pulley block safety hook 1 is provided, whose telescopic mechanism 10 consists of two relatively movable parts, such as a telescopic sleeve structure or a scissor-type linkage structure, which can change its overall length manually, i.e., adjust the distance between its two ends. At the movable ends of the telescopic mechanism 10, a wear-resistant plastic (such as nylon) guide wheel 20 is rotatably mounted via pins and bearings, respectively. The outer edges of these two guide wheels 20 are designed to fit into the grooves of a specific shaped track profile (such as the inward rolled edge of a U-shaped channel steel). A metal hook 30, such as a lifting ring or D-ring with a closed hole, is securely connected to a fixed or operable part of the telescopic mechanism 10 by welding or bolting. This hook 30 is used to connect the worker's safety belt or safety rope. The locking mechanism 40 can be a mechanical locking device, such as a rotatable lever or a push-button pin. After the telescopic mechanism 10 is stretched to its working length (extended state) and the guide wheels 20 at both ends are correctly embedded in the grooves of the track profile, the locking mechanism 40 can be manually operated to make it mechanically abut or engage with a specific surface or structure (such as a preset slot or protrusion) of the hook 30, thereby preventing the telescopic mechanism 10 from accidentally retracting or changing length, and locking the telescopic mechanism 10 in its current state.
[0033] In some embodiments, the telescopic mechanism 10 includes a first component 101 and a second component 102, at least a portion of the second component 102 being slidably accommodated inside the first component 101, and the first component 101 and the second component 102 being slidable relative to each other to adjust the distance between their distal ends.
[0034] Based on the pulley block safety hook 1 provided in the above embodiment, specifically, the telescopic mechanism 10 adopts a sleeve design. The first component 101 is an outer sleeve with a hollow interior, made of a high-strength metal such as stainless steel tubing. The second component 102 is an inner sleeve or solid rod with an outer diameter slightly smaller than the inner diameter of the first component 101, also made of metal. At least a portion of the inner sleeve is inserted into the interior of the outer sleeve and can slide freely along its axial direction under the guidance of the outer sleeve. The overall distance between the free ends of the two components can be adjusted by pushing or pulling the position of the inner sleeve relative to the outer sleeve.
[0035] In some embodiments, guide wheels 20 are rotatably disposed at the distal ends of the first component 101 and the second component 102, respectively.
[0036] Based on the pulley block safety hook 1 provided in the above embodiment, more specifically, one of the two guide wheels 20 is mounted on the free end of the first component 101 (outer sleeve) away from the insertion end of the inner sleeve via a pin and bearing; the other guide wheel 20 is mounted on the free end of the second component 102 (inner sleeve) extending out of the outer sleeve via a similar pin and bearing. This arrangement ensures that the distance between the two guide wheels 20 changes as the inner sleeve extends or retracts relative to the outer sleeve.
[0037] In some embodiments, the safety hook 1 further includes an elastic reset member 50 disposed between the first member 101 and the second member 102, for driving the first member 101 and the second member 102 to separate from each other when the telescopic mechanism 10 is in its natural state, so that the guide wheel 20 tends to open to an extended state for engaging with the groove of the track profile.
[0038] Based on the pulley block safety hook 1 provided in the above embodiment, specifically, to achieve automatic opening of the guide wheels 20 and provide locking preload, the safety hook 1 further includes an elastic reset member 50. This elastic reset member 50 can be a helical compression spring, which is installed between the first member 101 and the second member 102. For example, the spring can be sleeved on the outside of a portion of the inner sleeve and housed inside the outer sleeve. In its natural state (i.e., without external compression), the spring applies a mutually separating thrust to the first member 101 and the second member 102, causing the two guide wheels 20 to tend to open to the maximum permissible gap between them (extended state), so that they can be tightly embedded and cooperate with the grooves of the track profile.
[0039] In some embodiments, the elastic reset member 50 is disposed in the internal cavity of the first member 101 and acts on the end or shoulder of the second member 102 to apply an elastic thrust to the second member 102 to extend it outward relative to the first member 101.
[0040] Based on the pulley block safety hook 1 provided in the above specific embodiment, specifically, the elastic reset member 50 (e.g., a helical compression spring) is placed in the internal cavity of the first component 101 (outer sleeve). One end of the spring abuts against a fixed structure inside the first component 101 (outer sleeve), such as the inner end wall of the outer sleeve or a specially provided spring seat. The other end of the spring acts on the end face of the second component 102 (inner sleeve) inserted into the outer sleeve, or on a shoulder structure formed on the inner sleeve. In this way, the spring always applies an elastic thrust to the second component 102 (inner sleeve) to make it extend outward relative to the first component 101 (outer sleeve).
[0041] In some embodiments, a limiting member 1021 is radially provided on the second component 102, and a guide groove 1011 that cooperates with the limiting member 1021 is provided on the first component 101. The limiting member 1021 cooperates with the guide groove 1011 to limit the maximum extension stroke of the second component 102 relative to the first component 101 and guide its axial sliding.
[0042] Based on the pulley block safety hook 1 provided in the above specific embodiment, in order to limit the maximum extension stroke of the second component 102 (inner sleeve) and ensure its sliding stability, a limiting member 1021, such as a short pin or a protruding stop, is radially fixed on the outer wall of the second component 102 (inner sleeve). Correspondingly, one or more straight guide grooves 1011 that cooperate with the limiting member 1021 are machined on the inner or outer wall of the first component 101 (outer sleeve). When the second component 102 (inner sleeve) extends outward, the limiting member 1021 on it slides in the guide groove 1011 of the first component 101 (outer sleeve). When the limiting member 1021 moves to the end of the guide groove 1011, it restricts the further extension of the second component 102 (inner sleeve), preventing it from detaching from the first component 101 (outer sleeve), and plays a guiding role in this process.
[0043] In some embodiments, the hook 30 is rigidly connected to the first member 101 and is used to connect the safety tether; the hook 30 is provided with an abutment surface 301, which is a recessed structure or a sloped structure, for interlocking with the locking mechanism 40.
[0044] Based on the pulley block safety hook 1 provided in the above specific embodiment, specifically, the hook member 30 is made of high-strength metal sheet by stamping and bending, and is firmly fixed to the outer surface of the first component 101 (outer sleeve) by welding to ensure that it can withstand the huge tensile force transmitted by the safety tether. At a specific position of the hook member 30, for example, on its end face near the second component 102 (inner sleeve) or the range of motion of the locking mechanism 40, a contact surface 301 with a specific contour is formed by die stamping or machining. The contact surface 301 can be an inwardly recessed shallow pit or an inclined plane, the shape and size of which are designed to form a stable, interlocking contact with a specific part of the subsequent locking mechanism 40 (such as the locking rod 401) that prevents relative sliding.
[0045] In some embodiments, the locking mechanism 40 includes a locking rod 401 operably connected to the second member 102. The locking rod 401 is adapted to lock the telescopic mechanism 10 by rotating and abutting against the abutting surface 301 on the hook member 30 after the telescopic mechanism 10 is in the extended state and the guide wheel 20 is engaged in the groove of the track profile, using the pre-tightening force of the elastic reset member 50.
[0046] Based on the pulley block safety hook 1 provided in the above specific embodiment, the locking mechanism 40 specifically includes a locking rod 401 made of metal. One end of the locking rod 401 is operably (e.g., pivotally) connected to the second component 102 (inner sleeve) or a component (such as the operating handle 402) fixed to the second component 102 (inner sleeve) via a pin or rivet. When the telescopic mechanism 10 is in the extended state under the action of external force (or under the action of the elastic reset member 50), and the two guide wheels 20 are correctly embedded in the grooves of the track profile, the operator can manually rotate the locking rod 401. The free end of the locking rod 401 or its specially designed contact surface will rotate to contact and engage with the preset abutment surface 301 (such as a recess or slope) on the hook member 30. At this time, since the elastic reset member 50 is still applying an outward preload force (i.e., a force that attempts to extend it further) to the second member 102 (inner sleeve), this preload force will generate sufficient friction or mechanical locking force between the locking rod 401 and the abutment surface 301, thereby preventing the second member 102 (inner sleeve) from accidentally retracting relative to the first member 101 (outer sleeve), thus achieving the locking of the current extended state of the telescopic mechanism 10.
[0047] In some embodiments, the safety hook 1 further includes an operating handle 402, which is fixedly connected to the second component 102; one end of the locking lever 401 is pivotally connected to the operating handle 402.
[0048] Based on the pulley block safety hook 1 provided in the above specific embodiment, to facilitate the operation of the locking rod 401 and the entire telescopic mechanism 10, the safety hook 1 is further provided with an operating handle 402. The operating handle 402 can be a metal plate or a metal rod, one end of which is firmly connected to the outer wall of the second component 102 (inner sleeve) by welding or bolting, so that it moves synchronously with the second component 102 (inner sleeve). One end of the locking rod 401 is pivotally connected to the operating handle 402 by passing through a hole in the locking rod 401 itself and a pre-set hole in the locking rod 401 through a headed pin or rivet, so that the locking rod 401 can be rotated around the pivot point.
[0049] In some embodiments, when the guide wheel 20 of the pulley block safety hook 1 is placed inside the track profile and the locking mechanism 40 is in the unlocked state, the elastic reset member 50 drives the second member 102 to extend outward relative to the first member 101, so that the guide wheels 20 at both ends abut against and embed into the grooves of the relative inner walls of the track profile under the action of elastic thrust; when the locking mechanism 40 locks the telescopic mechanism 10 in the extended state, the contact between the locking rod 401 and the abutment surface 301 prevents the first member 101 and the second member 102 from retracting relative to each other, thereby firmly holding the guide wheel 20 in the groove of the track profile.
[0050] In the actual operation and working process of the pulley block safety hook 1 provided in the above specific embodiment: when the operator needs to insert the guide wheel 20 into the interior of the track profile, it is first necessary to overcome the elastic force of the elastic reset member 50 and compress the telescopic mechanism 10 (for example, by pressing the hook 30 on the first component 101 and the operating handle 402 on the second component 102 inward). When the locking mechanism 40 is in the unlocked state (i.e., the locking rod 401 is not in contact with the abutment surface 301), the guide wheel 20 is placed into the track groove. After the external force is released, the elastic reset member 50 will drive the second component 102 (inner sleeve) to automatically extend outward relative to the first component 101 (outer sleeve), so that the guide wheels 20 at both ends are respectively embedded and tightly abutted against the grooves of the relative inner walls of the track profile under the action of elastic force, so that the hook is initially fixed. Subsequently, the operator rotates the locking rod 401 on the operating handle 402 to make it form a tight contact with the abutment surface 301 on the hook 30 and lock it. In this locked state, the mechanical interlock between the locking lever 401 and the abutment surface 301, along with the continuous preload provided by the elastic reset member 50, jointly prevents the first component 101 and the second component 102 from undergoing relative contraction movement. This ensures that the guide wheel 20 is securely held within the groove of the track profile, preventing accidental disengagement or wobbling. For those skilled in the art, other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here, but obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this invention.
Claims
1. A safety hook for a pulley block, characterized in that, include: A telescopic mechanism for adjusting the distance between its two ends; At least two guide wheels are provided, each of which is rotatably disposed at one end of the telescopic mechanism, and the guide wheels are adapted to be embedded in the grooves of the track profile. A mounting bracket, connected to the telescopic mechanism, is used to connect a safety tether; as well as A locking mechanism is provided to lock the telescopic mechanism in its telescopic state, thereby limiting the distance between the two ends of the telescopic mechanism.
2. The safety hook for a pulley block according to claim 1, characterized in that, The telescopic mechanism includes a first component and a second component, at least a portion of the second component being slidably accommodated inside the first component, and the first component and the second component being slidable relative to each other to adjust the distance between their distal ends.
3. The safety hook for a pulley block according to claim 2, characterized in that, The guide wheels are rotatably mounted at the distal ends of the first component and the second component, respectively.
4. A safety hook for a pulley block according to claim 3, characterized in that, The safety hook also includes an elastic reset member disposed between the first component and the second component, used to drive the first component and the second component to separate from each other when the telescopic mechanism is in its natural state, so that the guide wheel tends to open to an extended state for engaging with the groove of the track profile.
5. The safety hook for a pulley block according to claim 4, characterized in that, The elastic reset member is disposed in the internal cavity of the first member and acts on the end or shoulder of the second member to apply an elastic thrust to the second member, causing it to extend outward relative to the first member.
6. The safety hook for a pulley block according to claim 5, characterized in that, The second component is radially provided with a limiting member, and the first component is provided with a guide groove that cooperates with the limiting member. The limiting member cooperates with the guide groove to limit the maximum extension stroke of the second component relative to the first component and guide its axial sliding.
7. A safety hook for a pulley block according to claim 4, characterized in that, The hook-on component is rigidly connected to the first component and is used to connect the safety tether; the hook-on component is provided with an abutment surface, which is a recessed structure or a sloping structure, for interlocking with the locking mechanism.
8. A safety hook for a pulley block according to claim 7, characterized in that, The locking mechanism includes a locking rod operably connected to the second component. The locking rod is adapted to lock the telescopic mechanism by rotating and abutting against the abutting surface on the hook-up member after the telescopic mechanism is in the extended state and the guide wheel is engaged in the groove of the track profile, using the pre-tightening force of the elastic reset member.
9. The safety hook for a pulley block according to claim 8, characterized in that, The safety hook also includes an operating handle, which is fixedly connected to the second component; one end of the locking rod is pivotally connected to the operating handle.
10. The safety hook for a pulley block according to claim 9, characterized in that, When the guide wheel of the safety hook of the pulley block is placed inside the track profile and the locking mechanism is in the unlocked state, the elastic reset member drives the second component to extend outward relative to the first component, so that the guide wheels at both ends abut against and embed into the grooves of the inner wall of the track profile under the action of elastic thrust. When the locking mechanism locks the telescopic mechanism in the extended state, the contact between the locking rod and the abutment surface prevents the first component and the second component from retracting relative to each other, thereby firmly holding the guide wheel in the groove of the track profile.