CN212877964U - Spring hook - Google Patents

Abstract

The utility model discloses a spring hook contains two hook arms pin joint on a center post, and the underarm body of two hook arms supports in a spring, makes two lock rings that the upper arm body defined keep the normal close. When the two lower arm bodies are pressed, the two upper arm bodies rotate outwards to open the lock ring, and a retaining ring is allowed to be hooked with the lock ring. When the two lower arm bodies are loosened, the locking ring is automatically closed under the action of the spring, so that the retaining ring and the spring hook are locked. When only one hook arm is triggered, the lock ring is only partially opened, the snap ring and the spring hook are not unhooked, and the risk of accidental opening of the spring hook due to mistaken collision is reduced to the minimum.

Description

Spring hook

Technical Field

The present invention relates to a spring hook, and more particularly to a spring hook with active protection and capable of preventing accidental opening.

Background

Snap hooks (Snap hooks), also known as Snap hooks, safety hooks or safety buckles, are widely used in Pet leashes (Pet Leash) and safety ropes in mountaineering, rock climbing, tracing, engineering and fire fighting fields because of lightness, convenience and safety.

Fig. 1 shows a typical snap hook 80. The latch hook 80 includes a hook 81 and a latch 82 slidably supported on the hook 81, and an opening 83 of the hook 81 is normally closed by the latch 82. When the latch 82 is moved downward, the opening 83 of the hook 81 is opened, so that a hook ring 85 can be hooked with the hook 81 through the opening 83. When the latch 82 is released, the latch 82 returns to its original position under the action of a compression spring 84, which automatically closes the opening 83 of the hook 81, so that the snap ring 85 is locked with the snap hook 80.

Fig. 2 shows another conventional snap hook 90. The latch hook 90 includes a hook 91 and a latch 92 pivotally connected to the hook 91, wherein an opening 93 of the hook 91 is normally closed by the latch 92. When the latch 92 is rotated inward, the opening 93 of the hook 91 is opened, so that a snap ring 95 can be hooked with the hook 91 through the opening 93. When the latch 92 is released, the latch 92 returns to its original position under the action of a torsion spring 94, which automatically closes the opening 93 of the hook 91, so that the snap ring 95 is locked with the snap hook 90.

Since the latch 80/90 is controlled to open and close by the latch 82/92, which is simple to operate, the latch 82/92 is also easily moved/rotated by accidental touch, so that the latch 80/90 is not allowed to open automatically, and the clasp 85/95 may be unhooked from the latch 80/90, which may cause safety concerns.

Taiwan patent No. i447310 "safety hook" aims at solving the above problems. The safety hook comprises a safety button, and when the safety button moves to a locking position, the spring bolt is locked, so that the situation that the spring bolt is opened due to misoperation to cause accidental unhooking of the retaining ring and the safety hook is avoided. When the safety button is moved to the unlocked position, the latch is allowed to open and the buckle is removed. Although the latch is locked by the safety button, the latch can be prevented from being opened accidentally, but the safety button is an additional part for the safety hook, and the operation of the safety button is an additional action, so that the convenience of the safety hook during operation is reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve above-mentioned technical problem and provide a spring hook, it has active guard action, can fall to the minimum with the unexpected possibility of opening of spring hook.

To achieve the above object, the present invention provides a spring hook, which comprises a central post having a post body, a post head extending from the upper end of the post body to two sides, and a post base opposite to the post head, wherein the post head comprises a first post support and a second post support opposite to each other; a first hook arm having a first top end and a first tail end opposite to each other, and a first elbow portion between the first top end and the first tail end, the first elbow portion being pivotally connected to the first pillar brace, so that the first hook arm can rotate relative to the center pillar, and defining a first upper arm body and a first lower arm body with the first elbow portion as a center, the inner side of the first upper arm body being bent into a first arc portion; a second hook arm having a second top end and a second tail end opposite to each other, and a second elbow portion between the second top end and the second tail end, the second elbow portion being pivotally connected to the second support, so that the second hook arm can rotate relative to the central post, and a second upper arm body and a second lower arm body are defined with the second elbow portion as a center, and the inner side of the second upper arm body is bent into a second arc portion; and a spring supported between the center post and the first and second lower arm bodies to keep the first and second hook arms normally closed by its elastic force and define a locking ring between the first and second arc portions to be opened/closed with the rotation of the first and second hook arms.

In a preferred embodiment, the upper portion of the column body has a hole, the spring passes through the hole and comprises a first load bearing arm and a second load bearing arm which are opposite, and the first load bearing arm and the second load bearing arm respectively prop against the inner sides of the first lower arm body and the second lower arm body.

In a preferred embodiment, the lower portion of the column body extends towards two sides to form a first limit stop and a second limit stop, and when the first and second hook arms are closed, the first and second tail ends are respectively stopped at the first and second limit stops.

In a preferred embodiment, the first and second position-limiting stops each have a first and second guide rail, the first and second ends each have a first and second notch, and the first and second notches move along the first and second guide rails as the first and second hook arms rotate.

In a preferred embodiment, the length of the first hook arm is shorter than the length of the second hook arm, such that the engagement of the first and second top ends is offset from the central axis of the central post.

In a preferred embodiment, the front edge of the first arc portion includes an arc guide for guiding a buckle to which the spring hook is to be connected to the second arc portion, and the front and rear surfaces of the second upper arm body each have a reinforcing rib.

In preferred embodiments, the first elbow is bisected by a first groove extending to the first apex, and the second apex has a protrusion that fits into the first groove when the first and second hook arms are closed.

In a preferred embodiment, the spring hook further comprises a safety button having an internal thread, the shaft of the center post is provided with an external thread, and the safety button is screwed on the shaft to move through cooperation of the internal thread and the external thread.

In a preferred embodiment, the spring hook further comprises a swivel that is free to rotate about a post held in the center post.

In the preferred embodiment, the base of the central post has a connection hole.

The utility model has the advantages that: the utility model discloses a double hook arm design, each hook arm only is responsible for the aperture of spring hook partly, and two hook arms need rotate in step and just can effectively open spring hook. Because the probability of the simultaneous misoperation of the two hook arms is extremely low, the risk of accidental opening of the spring hook can be reduced to the minimum, and active protection can be achieved without adding components or extra operation, so that the device is simple and reliable.

The details of the present invention, together with other objects and features thereof, will be best understood from the following description of embodiments when read in connection with the accompanying drawings.

Drawings

Fig. 1 is a cross-sectional view of a used snap hook.

Fig. 2 is a cross-sectional view of another used snap hook.

Fig. 3 is an external view of the spring hook of the present invention.

Fig. 4 is an exploded view of the present invention.

Fig. 5 is a cross-sectional view of the present invention.

Fig. 6 is a cross-sectional view of the present invention showing the first and second hook arms opened in synchronization to allow the buckle to be hooked/unhooked to the lock ring.

Fig. 7 is a sectional view of the present invention, showing a state where only the first hook arm is opened.

Fig. 8 is a sectional view of the present invention, showing a state where only the second hook arm is opened.

Fig. 9 is an external view of another embodiment of the present invention.

10,10a … spring hook 11,11a … center post

12 … first hook arm 13 … second hook arm

14 … spring 15 … swivel

16 … safety button 17 … retaining ring

20 … central axis 21 … column shaft

22 … column cap 23,23a … column cap base

24 … hole 25 … first brace

26 … second brace 27 … first pivot hole

28 … second pivot hole 29 … journal

30 … external thread 31 … first limit stop

32 … second stop 33 … first guide

34 … second guide 35 … connecting hole

40 … locking collar 41 … first top end

42 … first tail end 43 … first elbow

44 … first groove 45 … first elbow hole

46 … first fastener 47 … first upper arm

48 … first lower arm body 49 … first arc part

Anti-slip structure of arc guide 51 … of 50 …

53 … first notch 60 … opening

61 … second top end 62 … second tail end

63 … second elbow 64 … second groove

65 … second toggle hole 66 … second fastener

67 … second upper arm body 68 … second lower arm body

69 … second arc portion 70 … reinforcing rib

71 … anti-slip structure 72 … axle hole

73 … second notch 74 … first load bearing arm

75 … second load bearing arm 76 … projection

77 … internal thread 80 … spring hook

81 … hook 82 … latch

83 … opening 84 … compression spring

85 … clasp 90 … spring hook

91 … hook 92 … latch

93 … opening 94 … torsion spring

95 … retaining ring

Detailed Description

As shown in fig. 3 to 5, the spring hook 10 of the present invention includes a center post 11, the center post 11 having a post body 21, a post head 22 extending from the upper end of the post body 21 to both sides, and a post base 23 opposite to the post head 22. Wherein, a hole 24 is radially arranged above the column body 21 for a spring 14 to pass through the column body 21. The column head 22 includes a first column support 25 and a second column support 26 opposite to each other, the first column support 25 has a first pivot hole 27, and the second column support 26 has a second pivot hole 28 for pivotally connecting a first hook arm 12 and a second hook arm 13, respectively. The base 23 is radially recessed to form a journal 29 for assembly with a swivel 15.

As shown in fig. 3 to 5, the first hook arm 12 is substantially arc-shaped, and the first pillar brace 25 pivotally connected to the center pillar 11 rotates. The first hook arm 12 has a first top end 41 and a first tail end 42 opposite to each other, and a first elbow 43 between the first top end 41 and the first tail end 42. Wherein the first elbow portion 43 is bisected by a first slot 44 extending to the first top end 41 and is provided with a first toggle hole 45, and after the first brace 25 is inserted into the first slot 44, the first hook arm 12 is pivotally connected to the first brace 25 by a first fastener 46 passing through the first toggle hole 45 and the first pivot hole 27, so that the first hook arm 12 can rotate relative to the central pillar 11. The first hook arm 12 defines upper and lower arm bodies centered on the first elbow 43, i.e., the arm body between the first elbow 43 and the first tip 41 is defined as a first upper arm body 47; the arm body between the first elbow portion 43 and the first end portion 42 is defined as a first lower arm body 48. Wherein, the inner side of the first upper arm body 48 is bent to form a first arc portion 49, and the front edge of the first arc portion 49 protrudes toward the second hook arm 13 to form an arc guide 50. The outer surface of the first lower arm 48 is provided with a slip-resistant structure 51 to increase the friction force when the first lower arm 48 is touched and pressed by fingers, thereby preventing the fingers from slipping.

As shown in fig. 3 to 5, the second hook arm 13 is also arc-shaped, and rotates facing the second brace 26 of the first hook arm 12 pivotally connected to the central pillar 11. The second hook arm 13 has a structure corresponding to the first hook arm 12, and includes a second top end 61 and a second tail end 62 opposite to each other, a second elbow 63, a second groove 64 bisecting the second elbow 63, a second elbow hole 65, a second fastener 66 pivotally connecting the second elbow 63 to the second brace 26, a second upper arm 67, and a second lower arm 68 having an anti-slip structure 71 on an outer surface thereof. The second arc portion 69 and the first arc portion 49 formed inside the second upper arm body 67 define a locking ring 40 when the two hook arms 12,13 are closed, i.e. the two top ends 41,61 are engaged, and the locking ring 40 is opened/closed along with the rotation of the two hook arms 12, 13. In addition, the second upper arm 67 has a reinforcing rib 70 at each of the front and rear sides thereof for increasing tensile strength.

As shown in fig. 3 to 5, the spring 14 is a torsion spring acting with a torsion force, and the outer shape thereof is substantially inverted U-shaped and passes through the hole 24 of the center post 11, so that the first load bearing arm 74 and the second load bearing arm 75 at two opposite sides respectively abut against the inner sides of the first lower arm body 48 and the second lower arm body 68, and the first hook arm 12 and the second hook arm 13 are kept normally closed under the action of the spring 14, that is, the first top end 41 and the second top end 61 are engaged with each other, and the locking ring 40 enclosed by the first arc portion 49 and the second arc portion 69 is kept in a closed state.

As shown in fig. 6, since the snap hook 10 is locked with a snap ring 17 by the locking ring 40, the locking ring 40 is relatively weak at the junction of the first tip 41 and the second tip 61. Therefore, in a preferred embodiment, as shown in fig. 5, the length of the first hook arm 12 may be shorter than the length of the second hook arm 13, so that the engagement of the two top ends 41,61 is offset from the central axis 20 of the spring hook 10 (central post 11), thereby avoiding the same length of the first hook arm 12 and the second hook arm 13, and causing the relatively weak position of the spring hook 10 to fall on the central axis 20 to reduce the tensile strength. The engagement of the two top ends 41,61 away from the central axis 20 of the spring hook 10 engages the arc guides 50 of the first arc portion 49 to guide the snap ring 17 to slide to the second arc portion 69 (as shown in fig. 6) reinforced by the reinforcing rib 70, thereby withstanding a large pulling force.

As further shown in fig. 4 and 5, the swivel 15 is a ring member, and may have a circular, D-shaped, rectangular or desired shape. The swivel 15 includes an axial hole 72 which is in clearance fit with the journal 29 of the central post 11, so that the swivel 15 can be freely rotated with respect to the post base 23 of the central post 11 for connection with an object (not shown) to which the spring hook 10 is attached, such as a pet leash, a safety cord, or the like.

In the preferred embodiment, the second hook arm 13 includes a protrusion 76 extending from the second top end 61 toward the first top end 41, the protrusion 76 being inserted into the first groove 44 when the two top ends 41,61 are engaged, thereby preventing the two upper arms 47,67 from being deflected sideways. In order to limit the rotation angle of the two hook arms 12,13, the central post 11 extends from the lower side of the post 21 to two sides to form a first limit stop 31 and a second limit stop 32, respectively, and when the spring hook 10 is in the locked state, the tail ends 42,62 of the two hook arms 12,13 are stopped at the two limit stops 31,32, respectively, thereby preventing the two lower arm bodies 48,68 from shifting outward. In addition, in order to prevent the two lower arm bodies 48,68 from being deviated sideways, the upper surfaces of the first limiting stopper 31 and the second limiting stopper 32 respectively protrude upwards to form a first guide rail 33 and a second guide rail 34, the two tail ends 42,62 are respectively provided with a first notch 53 and a second notch 73, and the two hook arms 12,13 respectively slide along the two guide rails 33,34 through the two notches 53,73, so as to limit the rotation of the two hook arms 12,13, and prevent the two hook arms 12,13 from being deviated sideways during the rotation. The spring hook 10 can be assisted to be accurately opened/closed by the optimized design.

As shown in fig. 6, when the spring hook 10 is locked, the two hook arms 12,13 rotate outward synchronously with the two fasteners 46,66 as the fulcrum when the index finger presses the two lower arm bodies 48,68, so that the two top ends 41,61 separate to form an opening 60 therebetween, thus opening the lock ring 40 and allowing a buckle ring 17 (i.e. the connection object of the spring hook 10) to be inserted into the lock ring 40 through the opening 60 to be hooked with the spring hook 10. When the two lower arm bodies 48,68 are released, the two hook arms 12,13 will return to their original positions under the action of the spring 14, so that the two top ends 41,61 are engaged to close the locking ring 40, and the retaining ring 17 and the spring hook 10 are locked to prevent the two from unhooking. Similarly, the snap ring 17 is also disengaged from the spring hook 10 by withdrawing the lock ring 40 through the opening 60 when the lock ring 40 is opened.

Since the maximum opening of the lock ring 40 (i.e. the width of the opening 60) is only slightly larger than the wire diameter of the snap ring 17, and the first hook arm 12 and the second hook arm 13 are only responsible for the opening of a part of the lock ring 40, the two hook arms 12 and 13 must rotate synchronously to effectively open the lock ring 40, and the snap ring 17 and the spring hook 10 are allowed to be hooked/unhooked. In other words, when only the first hook arm 12 is opened (as shown in fig. 7) or the second hook arm 13 is opened (as shown in fig. 8), the opening of the lock ring 40 will not allow the snap ring 17 to pass through. Because the probability of the two hook arms 12 and 13 being mistaken simultaneously is very little, the risk of accidental opening of the spring hook 10 can be reduced to the minimum, and the two hook arms 12 and 13 achieve the active protection effect, no additional components are needed, no additional action is needed, and the method is simple and reliable.

In the preferred embodiment, as shown in fig. 4 and 5, the snap hook 10 further comprises a safety button 16, the safety button 16 being a nut-like member having an internal thread 77 cooperating with the external thread 30 of the shaft 21, such that the safety button 16 is rotatably mounted on the central post 11 to move in the direction of the proceeding thread, thereby allowing/preventing the rotation of the two hook arms 12, 13. It will be appreciated that rotation of the safety button 16 to move it over the central post 11 permits the hook arms 12,13 to rotate (as shown in solid lines in figure 5). On the contrary, when the safety button 16 is moved to the lower side of the central pillar 11 (as shown by the dotted line in fig. 5), the two hook arms 12,13 are limited by the safety button 16 to rotate slightly, so as to ensure that the spring hook 10 is not opened accidentally. The safety button 16 cooperates with the active protection effect generated by the two hook arms 12 and 13 to ensure that the spring hook 10 has double safety enough to ensure the safety in use.

In another embodiment, the spring hook 10a as disclosed in FIG. 9 can be used in

The base 23a of the central post 11a provides an attachment hole 35 for attaching a pet leash or safety cord (not shown). The difference between the present embodiment and the above embodiments is mainly that the connecting hole 35 is used to replace the rotating ring 15, and the rest parts are completely the same, so the same parts as those in the above embodiments are denoted by the same symbols, and the previous description of the above embodiments is also applicable to the present embodiment, and will not be described again.

Of course, the above only is the preferred embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent structures or equivalent processes that utilize the contents of the specification and the drawings of the present invention are changed, or directly or indirectly applied to other related technical fields, and all the same principles are included in the patent protection scope of the present invention.

Claims (10)

1. A spring hook, characterized in that: comprises the following steps:

a central column having a column shaft, a column head extending from the upper end of the column shaft to two sides, and a column base opposite to the column head, the column head including a first column support and a second column support opposite to each other;

a first hook arm having a first top end and a first tail end opposite to each other, and a first elbow portion between the first top end and the first tail end, the first elbow portion being pivotally connected to the first pillar brace, so that the first hook arm can rotate relative to the center pillar, and defining a first upper arm body and a first lower arm body with the first elbow portion as a center, the inner side of the first upper arm body being bent into a first arc portion;

a second hook arm having a second top end and a second tail end opposite to each other, and a second elbow portion between the second top end and the second tail end, the second elbow portion being pivotally connected to the second support, so that the second hook arm can rotate relative to the central post, and a second upper arm body and a second lower arm body are defined with the second elbow portion as a center, and the inner side of the second upper arm body is bent into a second arc portion; and

a spring supported between the center post and the first and second lower arm bodies to keep the first and second hook arms normally closed by its elastic force and define a locking ring between the first and second arc portions to be opened/closed with the rotation of the first and second hook arms.

2. The snap hook of claim 1, wherein: the upper part of the column body is provided with a hole, the spring passes through the hole and comprises a first load bearing arm and a second load bearing arm which are opposite, and the first load bearing arm and the second load bearing arm respectively prop against the inner sides of the first lower arm body and the second lower arm body.

3. The snap hook of claim 1, wherein: the lower part of the column body extends towards two sides respectively to form a first limit stop and a second limit stop, and when the first hook arm and the second hook arm are closed, the first tail end and the second tail end are respectively stopped at the first limit stop and the second limit stop.

4. The snap hook of claim 3, wherein: the first limiting block and the second limiting block are respectively provided with a first guide rail and a second guide rail, the first tail end and the second tail end are respectively provided with a first notch and a second notch, and the first notch and the second notch move along the first guide rail and the second guide rail along with the rotation of the first hook arm and the second hook arm.

5. The snap hook of claim 1, wherein: the length of the first hook arm is shorter than that of the second hook arm, so that the fit between the first top end and the second top end deviates from the central axis of the central column.

6. The snap hook of claim 1, wherein: the front edge of the first arc part comprises an arc guide which guides a retaining ring to which the spring hook is connected to the second arc part, and the front and the rear of the second upper arm body are respectively provided with a reinforcing rib.

7. The snap hook of claim 1, wherein: the first elbow is bisected by a first groove extending to the first apex, and the second apex has a protrusion that fits into the first groove when the first and second hook arms are closed.

8. The snap hook of claim 1, wherein: the safety button is provided with an internal thread, the column body of the central column is provided with an external thread, and the safety button is screwed on the column body to move through the cooperation of the internal thread and the external thread.

9. The snap hook of claim 1, wherein: further comprising a free-wheeling swivel retained on the central post.

10. The snap hook of claim 1, wherein: the pillar base of the central pillar has a connection hole.

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