Safety hook for pulley block

Abstract

The invention belongs to the technical field of safety protection equipment, and particularly relates to a pulley block safety hook. A pulley block safety hook comprises a telescopic mechanism used for adjusting the distance between the two ends of the telescopic mechanism; the at least two guide wheels are rotatably arranged at the two ends of the telescopic mechanism respectively, and the guide wheels are suitable for being embedded into grooves of track profiles; the hanging piece is connected with the telescopic mechanism and used for being connected with a safety lacing cable; and the locking mechanism is used for locking the telescopic state of the telescopic mechanism so as to limit the distance between the two ends of the telescopic mechanism.

Description

Technical Field

[0001] The invention belongs to the technical field of safety protection equipment, and in particular relates to a pulley block safety hook. Background Art

[0002] With the acceleration of industrialization and the continuous development of urban construction, aerial work, track inspections, and mobile operations in specific industrial environments are increasing. In these work scenarios, ensuring the personal safety of workers is crucial. Traditional safety protection measures typically include the use of safety belts in conjunction with fixed anchor points or simple hooks. However, when workers need to move linearly over long distances on U-channel steel, C-shaped steel, or other similar track profiles, the traditional fixed anchor point method is inefficient. Workers need to frequently unfasten and refasten the safety belt, which is not only time-consuming and labor-intensive, but also prone to safety hazards during the intervals between unfastening and refastening. In addition, during actual construction, workers often experience reduced work efficiency due to the safety belt hook not being fully or securely buckled into the track, or because the hook is not smooth during movement and is prone to getting stuck. More seriously, these defects directly threaten the safety of workers. Summary of the Invention

[0003] The purpose of the present invention is to address the above-mentioned deficiencies and provide a pulley block safety hook. This application aims to provide a new type of pulley block safety hook, which, through its unique telescopic guide wheel embedding, elastic reset tensioning and rotation locking mechanism, effectively solves the technical problems existing in the prior art, such as loose connection, inconvenient movement, lack of reliable locking, insufficient safety and low operating efficiency, thereby significantly improving the safety and convenience of working on rail profiles.

[0004] A pulley block safety hook, comprising: a telescopic mechanism, the telescopic mechanism being used to adjust the distance between its two ends; At least two guide wheels, the two guide wheels being rotatably disposed at both ends of the telescopic mechanism, and the guide wheels being adapted to be embedded in the grooves of the track profile; a hooking member connected to the telescopic mechanism and used for connecting a safety lanyard; and A locking mechanism is used to lock the telescopic state of the telescopic mechanism to limit the distance between the two ends of the telescopic mechanism.

[0005] Furthermore, the telescopic mechanism includes a first component and a second component, at least a portion of the second component is slidably accommodated inside the first component, and the first component and the second component can slide relative to each other to adjust the distance between their distal ends.

[0006] Furthermore, the guide wheels are rotatably provided at the distal ends of the first component and the second component respectively.

[0007] Furthermore, the safety hook also includes an elastic reset member, which is arranged between the first component and the second component, and is used to drive the first component and the second component to separate from each other when the telescopic mechanism is in a natural state, so that the guide wheel tends to open to an extended state for cooperating with the groove of the rail profile.

[0008] Furthermore, the elastic return member is arranged in the internal cavity of the first component and acts on the end or shoulder of the second component to apply an elastic thrust to the second component to cause it to extend outward relative to the first component.

[0009] Furthermore, a limit piece is radially provided on the second member, and a guide groove cooperating with the limit piece is provided on the first member. The limit piece cooperates with the guide groove to limit the maximum extension stroke of the second member relative to the first member and guide its axial sliding.

[0010] Furthermore, the hanging member is rigidly connected to the first component and is used to connect the safety lanyard; the hanging member is provided with an abutment surface, which is a concave structure or a slope structure, and is used to form an interlocking state with the locking mechanism.

[0011] Furthermore, the locking mechanism includes a locking rod operably connected to the second component, and the locking rod is suitable for rotating to abut against the abutment surface on the hanging member when the telescopic mechanism is in the extended state and the guide wheel is engaged in the groove of the track profile, thereby locking the telescopic mechanism by utilizing the pre-tightening force of the elastic reset member.

[0012] Furthermore, the safety hook also includes an operating handle fixedly connected to the second component; one end of the locking rod is pivotally connected to the operating handle.

[0013] Furthermore, when the guide wheel of the pulley block safety hook is placed inside the track profile and the locking mechanism is in the unlocked state, the elastic return member drives the second component to extend outward relative to the first component, so that the guide wheels at both ends respectively abut and embed into the grooves on the relative inner walls 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 contracting relative to each other, thereby firmly maintaining the guide wheel in the groove of the track profile.

[0014] Beneficial effects of the present invention: The present invention provides a pulley block safety hook, which includes a telescopic mechanism and guide wheels rotatable at both ends, so that the safety hook can easily adapt to and be embedded in the grooves of rail profiles of different specifications or opening states, and the guide wheels can automatically expand and fit tightly with the rail groove after the external force is released, ensuring the initial stability of the connection between the hook and the rail and the smoothness of movement; the hanging piece arranged on the telescopic mechanism provides a reliable connection point for the safety lanyard, and the abutment surface further arranged thereon is the key structural basis for achieving effective locking; when the guide wheel is inserted into the rail groove and the telescopic mechanism is in the extended state, the locking rod linked to the second component is operated to rotate so that it abuts with the abutment surface on the hanging piece, so that the telescopic mechanism is firmly locked in the extended state, thereby effectively preventing the risk of the hook from being relatively contracted or falling off the rail when external force disturbance or accidental movement of the operator. This locking method is not only relatively simple in structure and convenient in operation, but also provides the ability to stay firmly at the working point, avoiding the instability of traditional sliding devices when precise positioning or resistance to sudden external forces is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Isometric drawing of a safety hook for a pulley block; Figure 2 Exploded view of the safety hook for the pulley block; Figure 3 This is the main view of the pulley block safety hook; Figure 4 A side view of the safety hook of the pulley block; Figure 5 A top view of the safety hook of the pulley assembly; Figure numerals: 1, safety hook; 10, telescopic mechanism; 101, first component; 1011, guide groove; 102, second component; 1021, limit member; 20, guide wheel; 30, hanging member; 301, abutment surface; 40, locking mechanism; 401, locking rod; 402, operating handle; 50, elastic reset member. DETAILED DESCRIPTION

[0016] The following is a further detailed description of a pulley safety hook according to the present invention in conjunction with the examples. For the sake of simplicity of description, this document cannot enumerate all the alternative technical features and implementation schemes contained in the present invention. Therefore, those skilled in the art should know that any technical features and implementation schemes in this embodiment do not limit the scope of protection of the present invention, which includes any alternative technical features and implementation schemes adopted by all those skilled in the art without creative work. Specifically, the implementation schemes obtained by replacing any technical feature in the present invention or combining any two or more technical features provided by the present invention should be within the scope of protection of the present invention.

[0017] This embodiment provides a pulley block safety hook 1, comprising: The telescopic mechanism 10 is used to adjust the distance between its two ends; At least two guide wheels 20, the two guide wheels 20 are rotatably disposed at both ends of the telescopic mechanism 10, and the guide wheels 20 are suitable for being embedded in the grooves of the track profile; a hooking member 30 connected to the telescopic mechanism 10 for connecting a safety lanyard; and 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.

[0018] In one specific embodiment, a pulley block safety hook 1 is provided, wherein a telescopic mechanism 10 is composed of two relatively movable parts, such as a telescopic sleeve structure or a scissor-type connecting rod structure, which can be manually adjusted in overall length, i.e., the distance between its ends can be adjusted. A guide wheel 20 made of wear-resistant plastic (such as nylon) is rotatably mounted at each movable end of the telescopic mechanism 10 via a pin and a bearing. The outer edges of the two guide wheels 20 are designed to fit within the grooves of a specifically shaped track profile (such as the inner curl of a U-shaped channel steel). A metal attachment 30, such as a ring or D-ring with a closed hole, is securely connected to a fixed or operable portion of the telescopic mechanism 10 by welding or bolting. The attachment 30 is used to connect the operator's safety belt or safety rope. The locking mechanism 40 can be a mechanical locking device, such as a rotatable lever or a push-type latch. After the telescopic mechanism 10 is stretched to its working length (extended state) and the guide wheels 20 at both ends have been correctly embedded in the grooves of the track profile, the locking mechanism 40 can be manually operated to mechanically abut or engage with a specific surface or structure (such as a preset slot or protrusion) of the hanging member 30, thereby preventing the telescopic mechanism 10 from accidentally contracting or changing in length, thereby locking the current state of the telescopic mechanism 10.

[0019] 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 is slidably accommodated inside the first component 101 , and the first component 101 and the second component 102 can slide relative to each other to adjust the distance between their distal ends.

[0020] Based on the pulley block safety hook 1 provided in the above embodiment, the telescopic mechanism 10 specifically employs a sleeve-type design. The first member 101 is an outer sleeve with a hollow interior, made of a high-strength metal such as stainless steel. The second member 102 is an inner sleeve or solid rod with an outer diameter slightly smaller than the inner diameter of the first member 101, also made of metal. At least a portion of the inner sleeve is inserted into the interior of the outer sleeve and is able to slide freely along its axial direction under the guidance of the outer sleeve. By pushing or pulling the position of the inner sleeve relative to the outer sleeve, the overall spacing between the free ends of the two can be adjusted.

[0021] In some embodiments, guide wheels 20 are rotatably provided at the distal ends of the first component 101 and the second component 102 .

[0022] Based on the pulley block safety hook 1 provided in the above embodiment, more specifically, one of the two guide wheels 20 is mounted via a pin and bearing on the free end of the first member 101 (outer sleeve), away from the inner sleeve insertion end. The other guide wheel 20 is mounted via a similar pin and bearing on the free end of the second member 102 (inner sleeve), extending beyond the outer sleeve. This arrangement allows the distance between the two guide wheels 20 to change as the inner sleeve expands or contracts relative to the outer sleeve.

[0023] In some embodiments, the safety hook 1 also includes an elastic return member 50, which is arranged between the first member 101 and the second member 102, and is used to drive the first member 101 and the second member 102 to separate from each other when the telescopic mechanism 10 is in a natural state, so that the guide wheel 20 tends to open to an extended state for cooperating with the groove of the rail profile.

[0024] Based on the pulley assembly safety hook 1 provided in the above-described embodiment, specifically, to achieve automatic expansion of the guide pulley 20 and provide a locking preload, the safety hook 1 further includes an elastic return member 50. This elastic return member 50 can be a helical compression spring, mounted between the first member 101 and the second member 102. For example, the spring can be positioned around a portion of the outer sleeve and housed within the outer sleeve. In its natural state (i.e., when not under external compression), the spring exerts a force pushing the first and second members 101, 102 apart, causing the two guide pulleys 20 to expand to their maximum allowable spacing (extended state) so that they can fit snugly into and engage the grooves of the track profile.

[0025] In some embodiments, the elastic return member 50 is disposed in the internal cavity of the first component 101 and acts on the end or shoulder of the second component 102 to apply an elastic thrust to the second component 102 to extend outward relative to the first component 101 .

[0026] Based on the pulley block safety hook 1 provided in the aforementioned embodiment, a resilient return member 50 (e.g., a helical compression spring) is positioned within the interior cavity of the first member 101 (outer sleeve). One end of the spring abuts against a fixed structure within the first member 101 (outer sleeve), such as the inner end wall of the outer sleeve or a specially designed spring seat. The other end of the spring acts on the end surface of the second member 102 (inner sleeve) inserted into the outer sleeve, or on a shoulder structure formed on the inner sleeve. This way, the spring constantly exerts an elastic force on the second member 102 (inner sleeve), causing it to extend outward relative to the first member 101 (outer sleeve).

[0027] In some embodiments, a limiting member 1021 is radially provided on the second component 102, and a guide groove 1011 is provided on the first component 101 to cooperate with the limiting member 1021. 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.

[0028] Based on the pulley block safety hook 1 provided in the aforementioned specific embodiment, to limit the maximum extension stroke of the second member 102 (inner sleeve) and ensure its sliding stability, a stopper 1021, such as a short pin or a raised stopper, is radially fixed to the outer wall of the second member 102 (inner sleeve). Accordingly, one or more linear guide grooves 1011 are machined into the inner or outer wall of the first member 101 (outer sleeve) to mate with the stopper 1021. When the second member 102 (inner sleeve) extends outward, the stopper 1021 slides within the guide groove 1011 of the first member 101 (outer sleeve). When the stopper 1021 reaches the end of the guide groove 1011, it limits further extension of the second member 102 (inner sleeve), preventing it from disengaging from the first member 101 (outer sleeve) and providing guidance during this process.

[0029] In some embodiments, the hanging member 30 is rigidly connected to the first component 101 and is used to connect the safety lanyard; a contact surface 301 is provided on the hanging member 30, and the contact surface 301 is a concave structure or a slope structure for forming an interlocking state with the locking mechanism 40.

[0030] Based on the pulley block safety hook 1 provided in the above-described specific embodiment, the hook member 30 is specifically formed from high-strength metal sheet material through stamping and bending, and is securely fixed to the outer surface of the first member 101 (outer sleeve) by welding, ensuring that it can withstand the significant tensile force transmitted by the safety lanyard. A contact surface 301 with a specific profile is formed by die stamping or machining at a specific location on the hook member 30, such as on a side end surface near the second member 102 (inner sleeve) or the range of motion of the locking mechanism 40. This contact surface 301 can be a shallow inwardly recessed pit or an inclined plane, and its shape and size are designed to form a stable, interlocking contact with a specific portion of the subsequent locking mechanism 40 (such as the locking rod 401) to prevent relative sliding.

[0031] In some embodiments, the locking mechanism 40 includes a locking rod 401 operably connected to the second component 102. The locking rod 401 is suitable for rotating to abut against the abutment surface 301 on the hanging member 30 when the telescopic mechanism 10 is in an extended state and the guide wheel 20 is inserted into the groove of the track profile, thereby locking the telescopic mechanism 10 by utilizing the pre-tightening force of the elastic reset member 50.

[0032] Based on the pulley block safety hook 1 provided in the above-described specific embodiment, the locking mechanism 40 specifically includes a locking rod 401 made of a metal material. One end of the locking rod 401 is operably (e.g., pivotally) connected to the second member 102 (inner sleeve) or a component fixedly connected to the second member 102 (inner sleeve) (e.g., an operating handle 402) via a pin or rivet. When the telescopic mechanism 10 is in the extended state under the action of an external force (or under the action of the elastic return member 50), and the two guide wheels 20 are properly inserted into the grooves of the track profile, an operator can manually rotate the locking rod 401. The free end of the locking rod 401 or its specially designed contact surface rotates until it contacts and engages with a predetermined abutment surface 301 (e.g., a recessed or inclined surface) on the hook 30. At this time, since the elastic return member 50 still applies an outward pre-tightening force (i.e., a force attempting to further extend the second member 102 (inner sleeve)), this pre-tightening 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 contracting relative to the first member 101 (outer sleeve), thereby locking the telescopic mechanism 10 in the current extended state.

[0033] In some embodiments, the safety hook 1 further includes an operating handle 402 fixedly connected to the second component 102 ; one end of the locking rod 401 is pivotally connected to the operating handle 402 .

[0034] Building upon the pulley assembly safety hook 1 provided in the aforementioned embodiment, to facilitate operation of the locking rod 401 and the entire telescopic mechanism 10, the safety hook 1 further includes an operating handle 402. This operating handle 402 can be a metal plate or a metal rod, one end of which is securely connected to the outer wall of the second member 102 (inner sleeve) via welding or bolts, allowing it to move synchronously with the second member 102 (inner sleeve). One end of the locking rod 401 is pivotally connected to the locking rod 401 via a headed pin or rivet that passes through a hole in the locking rod 401 and a pre-defined hole in the operating handle 402, enabling rotation of the locking rod 401 around this pivot point.

[0035] In some embodiments, when the guide wheel 20 of the pulley assembly safety hook 1 is placed inside the track profile and the locking mechanism 40 is in the unlocked state, the elastic return member 50 drives the second component 102 to extend outward relative to the first component 101, so that the guide wheels 20 at both ends are respectively abutted against and embedded in 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 component 101 and the second component 102 from contracting relative to each other, thereby firmly keeping the guide wheel 20 in the groove of the track profile.

[0036] During the actual operation and working process of the pulley assembly safety hook 1 provided in the above-described specific embodiment, when an operator needs to insert the guide wheel 20 into the interior of the track profile, they first need to overcome the elastic force of the elastic return member 50 and compress the telescopic mechanism 10 (for example, by squeezing 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 releasing the external force, the elastic return member 50 drives 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, under the action of the elastic force, respectively embed and tightly abut against the grooves on the opposite inner walls of the track profile, thereby initially securing the hook. Subsequently, the operator rotates the locking rod 401 on the operating handle 402, causing it to form a close contact with the abutment surface 301 on the hook 30 and lock. In this locked state, the mechanical interlock between the locking rod 401 and the abutment surface 301 and the continuous preload provided by the elastic reset member 50 prevent the first member 101 and the second member 102 from retracting relative to each other, thereby ensuring that the guide wheel 20 is firmly held in the groove of the track profile and preventing accidental disengagement or shaking. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to exhaustively list all embodiments here, and obvious variations or modifications derived therefrom are still within the scope of protection of the claims of the present invention.

Claims

1. A pulley safety hook, characterized in that: include: a telescopic mechanism, the telescopic mechanism being used to adjust the distance between its two ends; At least two guide wheels, the two guide wheels being rotatably disposed at both ends of the telescopic mechanism, and the guide wheels being adapted to be embedded in the grooves of the track profile; a hooking member connected to the telescopic mechanism and used for connecting a safety lanyard; as well as The locking mechanism is used to lock the telescopic state of the telescopic mechanism to limit the distance between the two ends of the telescopic mechanism.

2. A pulley safety hook 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 is slidably accommodated in the interior of the first component. The first component and the second component can slide relative to each other to adjust the distance between their distal ends.

3. A pulley safety hook according to claim 2, characterized in that: The guide wheels are rotatably provided at the distal ends of the first member and the second member respectively.

4. A pulley safety hook according to claim 3, characterized in that: The safety hook also includes an elastic reset member, which is arranged between the first component and the second component, and is used to drive the first component and the second component to separate from each other when the telescopic mechanism is in a natural state, so that the guide wheel tends to open to an extended state for cooperating with the groove of the track profile.

5. The pulley block safety hook according to claim 4, characterized in that: The elastic return element is arranged in the inner cavity of the first component and acts on the end or shoulder of the second component to apply an elastic thrust to the second component to cause it to extend outward relative to the first component.

6. The pulley block safety hook according to claim 5, characterized in that: A limit piece is radially provided on the second member, and a guide groove cooperating with the limit piece is provided on the first member. The limit piece cooperates with the guide groove to limit the maximum extension stroke of the second member relative to the first member and guide its axial sliding.

7. The pulley safety hook according to claim 3, characterized in that: The hanging piece is rigidly connected to the first component and is used to connect the safety lanyard; the hanging piece is provided with an abutting surface, which is a concave structure or a slope structure and is used to form an interlocking state with the locking mechanism.

8. The pulley safety hook according to claim 7, characterized in that: The locking mechanism includes a locking rod operably connected to the second component. The locking rod is suitable for rotating to abut against the abutment surface on the hanging member when the telescopic mechanism is in the extended state and the guide wheel is inserted into the groove of the track profile, thereby locking the telescopic mechanism by utilizing the pre-tightening force of the elastic reset member.

9. The pulley block safety hook according to claim 8, characterized in that: The safety hook further comprises an operating handle fixedly connected to the second component; one end of the locking rod is pivotally connected to the operating handle.

10. The pulley block safety hook according to claim 9, characterized in that: When the guide wheel of the pulley block safety hook is placed inside the track profile and the locking mechanism is in the unlocked state, the elastic return member drives the second member to extend outward relative to the first member, so that the guide wheels at both ends respectively abut against and embed into the grooves on the opposite inner walls 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 member and the second member from contracting relative to each other, thereby firmly holding the guide wheel in the groove of the track profile.

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