Self-locking hook

Abstract

The application provides a self-locking lifting hook, which comprises a self-locking lifting hook body and a pull rod safety mechanism. Two connecting plates are movably connected to the lower end of a shackle, and the other ends of the two connecting plates are movably connected to one end of a straight segment of a hook body. The two hook bodies are movably connected at the connection between the straight segment and an arc segment, and the above components form the lifting hook body. The lifting hook body can be tightened in a natural state and has a self-locking function. The pull rod safety mechanism comprises a locking seat I, a locking seat II, a pull rod, a pull rod sleeve and a spring. The locking seat I and the locking seat II are fixed on the straight segment of the hook body. One end of the pull rod is movably connected to the locking seat I and can rotate around the locking seat I. The other end of the pull rod is inserted into the pull rod sleeve and is sleeved with the spring. When the safety mechanism is in a locking position, the spring is pre-compressed, the pull rod sleeve can be pressed against the locking surface of the locking seat II, and the pull rod sleeve can be rotated outward around the connection between the pull rod and the locking seat I to be unlocked, so that the secondary safety of the lifting hook is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the mechanical field, specifically relates to a self-locking lifting hook. BACKGROUND

[0002] The lifting hook used in the industry at present is mostly the general single hook such as the American cargo hook, which needs to be matched with the lifting rope, the lifting basket and other lifting appliances for use, and the lifting hook for directly lifting the object with specific shape is very few. With the development of modern industry, there is greater demand for the subdivision of the lifting hook, and the special self-locking integrated lifting hook has greater advantages in efficiency and reliability for the cylindrical heavy object which needs to be filled and transported by a single rod. SUMMARY

[0003] The present application aims at the above-mentioned existing problems, and provides a lifting hook which is light, can be quickly opened and closed, and has self-locking function, and is used for lifting the cylindrical heavy object such as round timber and metal pipe.

[0004] The present application provides a self-locking lifting hook, which comprises a self-locking lifting hook body and a pull rod safety mechanism.

[0005] The self-locking lifting hook body comprises a shackle, two connecting plates and two hook bodies.

[0006] The hook body comprises a straight section and an arc section arranged at one end of the straight section.

[0007] The lower end of the shackle is movably connected with one end of the two connecting plates, the other end of the two connecting plates is movably connected with one end of the straight sections of the two hook bodies, and the two hook bodies are movably connected at the connection between the straight sections and the arc sections.

[0008] The pull rod safety mechanism is used for keeping the two hook bodies in the closed state.

[0009] As a preferred mode of the present application, the pull rod safety mechanism comprises a locking seat I, a locking seat II, a pull rod, a pull rod sleeve and a spring.

[0010] The locking seat I and the locking seat II are respectively arranged on the straight sections of the two hook bodies, one end of the pull rod is movably connected with the locking seat I, the other end of the pull rod is inserted into the pull rod sleeve, the spring is sleeved on the pull rod inside the pull rod sleeve, one end of the spring is in abutment with the shaft shoulder inside the pull rod sleeve, and the other end of the spring is in abutment with the limiting plate arranged in the pull rod sleeve.

[0011] When the pull rod safety mechanism is in the locking position, the spring is pre-compressed to press the pull rod sleeve against the locking surface of the locking seat II; the pull rod sleeve can be rotated outwardly at the connection between the pull rod and the locking seat I to be separated from the locking surface of the locking seat II, and at this time, the pull rod safety mechanism is in the unlocking position.

[0012] As a preferred mode of the present application, the upper and lower sides of the locking surface of the locking seat II are respectively provided with protrusions, and the pull rod sleeve is provided with grooves corresponding to the protrusions.

[0013] As a preferred mode of the present application, the inner arc surface of the arc segment of the hook body is provided with a clamping piece, which is an arc plate, and the width of the clamping piece is greater than that of the arc segment of the hook body.

[0014] As a preferred mode of the present application, the outer arc surface of the arc segment of the hook body is provided with a handle.

[0015] As a preferred mode of the present application, one end of the pull rod close to the locking seat II is provided with a limiting screw hole, and the inner circumferential surface of the pull rod sleeve is provided with a sliding groove corresponding to the limiting screw hole, and the limiting screw is inserted into the limiting screw hole and the protruding part can move along the sliding groove.

[0016] As a preferred mode of the present application, the locking seat I and the locking seat II are both U-shaped structures, and the openings of the locking seat I and the locking seat II face outward.

[0017] Beneficial effects:

[0018] (1) The present application adopts the mode that the connecting piece is connected with the hook body pin, the hook can be tightened in the natural drooping state, the greater the weight of the hoisted object, the greater the clamping force of the hook body on the hoisted object, and the hook body has a self-locking function.

[0019] (2) The present application sets the pull rod safety mechanism on the hook body, the spring in the pull rod sleeve ensures that the pull rod sleeve always presses against the locking seat II in the natural state, the circular groove on the pull rod sleeve and the protrusion on the locking seat II cooperate to prevent the pull rod sleeve and the locking seat II from being separated when they are tightly pressed, and the pull rod safety mechanism realizes the secondary safety of the hook.

[0020] (3) The inner arc surface of the arc segment of the hook body is provided with a clamping piece, which increases the contact area with the hoisted object and makes the hoisting more stable.

[0021] (4) The outer arc surface of the arc segment of the hook body is provided with a handle, which facilitates the operator to pull apart the hook body during operation.

[0022] (5) The pull rod is provided with a limiting screw hole, the pull rod sleeve is provided with a sliding groove in the light hole A, and the protruding part of the limiting screw moves in the sliding groove of the light hole A after being inserted into the limiting screw hole, which can limit the radial rotation of the pull rod sleeve and prevent the misalignment of the groove of the pull rod sleeve and the protrusion of the locking seat II. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the overall schematic diagram of the present application;

[0024] Figure 2 Fig. 1 is a force diagram of the present application;

[0025] Figure 3 Fig. 2 is a top view of the present application when the drawbar safety mechanism is in the locked state;

[0026] Figure 4 Fig. 3 is a sectional view of the present application when the drawbar safety mechanism is in the locked state;

[0027] Figure 5 Fig. 4 is a sectional view of the present application when the drawbar safety mechanism is in the unlocked state;

[0028] Wherein: 1 - shackle; 2 - connecting piece; 4 - hook body; 5 - clamping piece; 6 - handle; 7 - locking seat I; 8 - locking seat II; 9 - drawbar; 10 - drawbar sleeve; 11 - limiting screw; 12 - spring; 13 - limiting plate. DETAILED DESCRIPTION

[0029] The present application will be further described in detail below in conjunction with the drawings and examples.

[0030] Example 1:

[0031] For ease of explanation, the terms "upper", "lower", "left", "right", "inner" and "outer" are used to describe the features of the exemplary embodiments shown in the drawings with reference to the positions of the features. In the drawings, "outer" is outward in the vertical paper plane.

[0032] The self-locking lifting hook of the present embodiment comprises a self-locking lifting hook body and a drawbar safety mechanism. The self-locking lifting hook body comprises a shackle 1, a connecting piece 2, and a hook body 4, and the drawbar safety mechanism comprises a locking seat I 7, a locking seat II 8, a drawbar 9, and a drawbar sleeve 10.

[0033] The hook body 4 has a straight section and an arc section provided at one end of the straight section;

[0034] Referring to the drawings, Figure 1 The shackle 1 is the lifting point of the self-locking lifting hook, one end of the two connecting pieces 2 is movably connected to the lower end of the shackle 1 by a pin, and the other end is movably connected to one end of the straight section of the two hook bodies 4 by a pin respectively; the two hook bodies 4 are crossed at the connection between the straight section and the arc section and are movably connected by a pin, thereby forming a circular clamping hook with the inner arc surfaces of the arc sections of the two hook bodies 4 opposite to each other; referring to the drawings, Figure 2 When lifting, the shackle 1 as the lifting point is subjected to an upward force, and the two hook bodies 4 are clamped inward when subjected to the upward lifting force, the greater the weight of the lifted object, the greater the clamping force of the hook bodies 4 on the lifted object, and the two hook bodies 4 have no tendency to separate, i.e. have self-locking ability, after the lifting is completed, the upward lifting force of the shackle 1 is removed, the self-locking of the lifting hook is released, and the lifting hook can be easily removed;

[0035] In the arc segment of the two hook bodies 4, the clamping pieces 5 are welded or riveted on the inner arc surface, the clamping pieces 5 are arc plates, the width of the clamping pieces 5 is greater than the width of the arc segment of the hook body 4, and the inner arc surface of the clamping pieces 5 can increase the contact area of the hoisted object; handles 6 are welded or riveted on the outer arc surface of the arc segment of the two hook bodies 4, which facilitates the operator to pull apart the lifting hooks when the self-locking of the lifting hooks is released; the above-mentioned parts form the main body of the self-locking lifting hook, the circular clamping hook hooks the cylindrical heavy object, and the lifting function of the cylindrical heavy object can be realized.

[0036] Referring to the accompanying drawings Figure 3 The pull rod safety mechanism adopts a spring self-resetting structure, the locking seat I 7 and the locking seat II 8 are U-shaped structures, are fixed on the linear segments of the two hook bodies 4 through screws respectively, and the opening sides of the locking seat I 7 and the locking seat II 8 face outward and are located on the same straight line. One end of the pull rod 9 is movably connected with the locking seat I 7 through a pin, and the pull rod 9 can rotate outward in the horizontal plane about the axis of the pin connected with the locking seat I 7. The other end of the pull rod 9 is inserted into the pull rod sleeve 10 located on the right side of the locking seat II 8, passes through the limiting plate 13 arranged inside the pull rod sleeve 10, and is locked by a nut. The inside of the pull rod sleeve 10 is a stepped hole, and the light hole A and the light hole B with increasing diameters are sequentially arranged along the axis from left to right, and a spring 12 is arranged in the light hole B in the axial direction, that is, one end of the spring 12 abuts against the limiting plate 13 in the pull rod sleeve 10, and the other end of the spring 12 abuts against the stepped surface at the junction of the light hole B and the light hole A. Initially, the spring 12 is pre-compressed and has a pre-tightening force.

[0037] The U-shaped structure of the locking seat II 8 is provided with a semicircular protrusion near the upper and lower sides of the pull rod sleeve 10, the pull rod sleeve 10 is provided with a semicircular groove at the corresponding position of the protrusion to cooperate with the semicircular protrusion, so that the pull rod sleeve 10 is pressed against the locking seat II 8 under the pre-tightening force of the spring 12, and the self-locking lifting hook is prevented from being loosened to lift the object.

[0038] Referring to the accompanying drawings Figure 4 and the accompanying drawings Figure 5 The pull rod sleeve 10 is provided with a sliding groove on the inner circumferential surface of the light hole A in the axial direction, the pull rod 9 is provided with a limiting screw hole, and the protruding part of the limiting screw 11 installed after the limiting screw hole can move along the sliding groove in the light hole A, so that the limiting screw 11 can limit the circumferential rotation of the pull rod sleeve 10 relative to the pull rod 9, the pull rod sleeve 10 can only move left and right along its axis, and the semicircular protrusion on the locking seat II 8 and the semicircular groove on the pull rod sleeve 10 cannot be aligned.

[0039] If the pull rod safety mechanism needs to be opened, the pull rod sleeve 10 is pulled to the right, and the pull rod sleeve 10 is rotated horizontally around the locking seat I7 to be away from the locking seat II 8, and the spring 12 is compressed at this time. If the pull rod safety mechanism needs to be locked, the pull rod sleeve 10 is pulled backward, and the pull rod sleeve 10 is rotated around the locking seat I7 to be in the same plane with the locking seat II 8, the semicircular protrusion on the locking seat II 8 and the semicircular groove on the pull rod sleeve 10 are kept in the same horizontal line, and then the pull rod sleeve 10 is released, and the pull rod sleeve 10 is reset forward under the action of the spring 12, so that the semicircular protrusion of the locking seat II 8 is clamped into the semicircular groove in the corresponding position of the pull rod sleeve 10. When the pull rod safety mechanism is in the locked state, the spring 12 is pre-compressed, that is, the pull rod sleeve 10 is pressed tightly on the locking seat II 8 due to the pre-compression force of the spring 12. The pull rod safety mechanism is locked, and even if the handle 6 of the hook body 4 is pulled by external force, the hook cannot be opened, and the secondary safety of the hook is realized.

[0040] In the natural state, the two hook bodies 4 of the hook are closed together under the action of gravity, and the pull rod safety mechanism is in the unlocked state. When the article needs to be lifted, the handle 6 is pulled to the two sides to open the hook, and after the hook is opened, the cylindrical lifting object is clamped, and after the pull rod safety mechanism is locked, the lifting can be started. After the lifting is completed, the pull rod safety mechanism is opened, the upward lifting force of the shackle 1 is removed, the self-locking of the hook is released, and the hook can be easily removed.

[0041] Example 2:

[0042] On the basis of the above-mentioned example 1, further:

[0043] In this example, the included angle between the straight section and the tangent line at the top end of the arc-shaped section of the hook body 4 is 120°, and the clamping force of the hook body 4 can be controlled by controlling the distance between the two pin nails at the ends of the straight section of the hook body 4. In this embodiment, the distance between the two pin nails at the ends of the straight section of the hook body 4 is the same as the radius of the arc-shaped section of the hook body 4.

[0044] Although the present application has been described in detail in the foregoing description and examples, modifications and improvements can be made to the present application, which will be apparent to those skilled in the art. Therefore, these modifications and improvements made on the basis of the spirit of the present application shall fall within the scope of the present application.

Claims

1. A self-locking hook, characterized in that, The utility model relates to a self-locking hook, which comprises a self-locking hook body and a drawbar safety mechanism. The self-locking hook body comprises a shackle, two connecting plates and two hook bodies. The hook body comprises a straight section and an arc section arranged at one end of the straight section. The lower end of the shackle is movably connected to one end of the two connecting plates, and the other end of the two connecting plates is movably connected to one end of the straight section of the two hook bodies. The two hook bodies cross and are movably connected at the joint of the straight section and the arc section. The drawbar safety mechanism is used to keep the two hook bodies in a closed state. The drawbar safety mechanism comprises a locking seat I, a locking seat II, a drawbar, a drawbar sleeve and a spring. The locking seat I and the locking seat II are respectively arranged on the straight section of the two hook bodies. One end of the drawbar is movably connected to the locking seat I, and the other end of the drawbar is inserted into the drawbar sleeve.

2. A self-locking hook according to claim 1, characterized in that The spring is pre-compressed to press the drawbar sleeve against the locking surface of the locking seat II when the drawbar safety mechanism is in a locking position.

3. A self-locking hook according to claim 1, wherein The drawbar sleeve can rotate outwardly around the joint of the drawbar and the locking seat I to separate from the locking surface of the locking seat II, and the drawbar safety mechanism is in an unlocking position at this time.

4. A self-locking hook according to claim 1, wherein The upper and lower sides of the locking surface of the locking seat II are respectively provided with protrusions, and the drawbar sleeve is provided with grooves corresponding to the protrusions.

5. A self-locking hook according to claim 2, wherein The inner arc surface of the arc section of the hook body is provided with a clamping piece, which is an arc plate.

6. A self-locking hook according to claim 1, wherein The width of the clamping piece is greater than the width of the arc section of the hook body. The outer arc surface of the arc section of the hook body is provided with a handle. One end of the drawbar close to the locking seat II is provided with a limiting screw hole, and the inner circumferential surface of the drawbar sleeve is provided with a sliding groove at the position corresponding to the limiting screw hole. The locking seat I and the locking seat II are both U-shaped structures, and the openings of the locking seat I and the locking seat II face outwardly.

Images