chain hook

Abstract

The invention relates to a carabiner comprising a first rigid bar hinged at its first end to the first end of a second folded bar configured to receive a first chain strap of a chain at its second end, the second end of the first bar being hinged to the first end of a third folded bar, a first arm and a second arm extending from the first end of the third folded bar, a cap being hinged to one of said bars. The carabiner is provided with a first pusher and a second pusher. According to the invention, the carabiner comprises a stop which, in the closed position of the carabiner, is housed between the first arm and the second arm of the third bar to ensure symmetrical opening of the arms when pressure is simultaneously applied to the pushers.

Description

Technical Field

[0001] This invention relates to a chain clasp hook, and more particularly to a watch chain. Background Technology

[0002] Document CH 700 356 describes a latch consisting of two pushers integrated with two hinged arms on a flexible shaft. A drawback of this latch is that, due to manufacturing tolerances, the flexible arms do not open symmetrically, thus the opening function does not always execute correctly.

[0003] A folding hook is also known from document EP 0 913 106, which includes a rigid base with two longitudinal members, a cap arranged to be attached to a chain belt, and at least one folding arm having a rear end and a front end. The rear end is attached to one end of the base via a first hinge, and the front end is attached to the cap via a second hinge. The folding arm includes two juxtaposed arms with push members, wherein the front ends are separated by an elastic element. This hook has the same disadvantages as described above: the cap has excessive play and does not allow the flexible arms to open symmetrically. Summary of the Invention

[0004] One object of the present invention is to overcome all or part of the above-mentioned disadvantages by providing a hook that can satisfy safety constraints while enabling symmetrical opening.

[0005] Another objective of this invention is to provide a hook that is simple in design and economical to manufacture.

[0006] Therefore, the present invention relates to a chain hook, the chain hook comprising:

[0007] A first rigid bar, the first end of which is hinged to the first end of a second folded bar, the second folded bar being configured to receive a first chain strip at its second end; the second end of the first rigid bar is hinged to the first end of a third folded bar; a first arm and a second arm extend from the first end of the third folded bar; the free ends of the first and second arms are traversed by an axle; a cap is hinged around this axle; the cap is equipped with a first fold and a second fold extending perpendicularly to the cap; and a retaining device for retaining a second chain strip; when the chain hook is in the closed position, the third folded bar partially covers the second end of the second folded bar.

[0008] -The first and second push members are integrated with the first and second arms of the third folding strip.

[0009] - A locking mechanism is arranged to keep the third folding strip locked to the first rigid strip when no pressure is applied simultaneously to the first and second pushers.

[0010] According to the present invention, the chain hook includes a stop portion that is accommodated between the first and second arms of the third folding strip when the chain hook is in the closed position, to ensure symmetrical opening of the arms when pressure is applied to the pusher.

[0011] Because of these features, such a chain hook allows for limiting the stroke of each flexible arm and thus ensures the function of the chain hook through the symmetrical opening of the arms.

[0012] Other advantageous alternative embodiments according to the invention:

[0013] - The stop is rigidly connected to the second end of the second folding strip;

[0014] - The stop is rigidly connected to the first rigid strip;

[0015] - The stop is rigidly connected to the cap;

[0016] - The width of the stop portion defines the stroke length of the pusher;

[0017] - The chain hook includes a locking device to keep the second folding strip locked to the first rigid strip when the chain hook is in the closed position, the locking device including a hook portion;

[0018] - The locking mechanism includes, on the one hand, a first pair of hooks rigidly connected to the first rigid bar, and on the other hand, a second pair of hooks rigidly connected to the third folding bar;

[0019] - The second pair of hooks is rigidly connected to the arm;

[0020] - The arm is flexible in the lateral direction over its entire or part of length.

[0021] The present invention also relates to a watch comprising a chain equipped with a clasp hook according to the invention. Attached Figure Description

[0022] Further features and advantages of the invention will become clearer after reading the following description of specific embodiments of the invention, given only by way of illustrative and non-limiting example, and the accompanying drawings, in which:

[0023] - Figure 1 This is a perspective view of a chain hook according to the invention, in the open position;

[0024] - Figure 2 This is a top view of the chain hook according to the present invention, the chain hook being in the closed position;

[0025] - Figure 3This is a bottom perspective view of the chain hook according to the invention, with the chain hook in the open position;

[0026] - Figure 4 This is a perspective view of the chain hook according to the present invention;

[0027] - Figure 5 This is an exploded view of the chain hook according to the present invention. Detailed Implementation

[0028] The following will be combined with references Figure 1 , 2 3, 4 and 5 describe the chain hook.

[0029] Figure 1 and 4 This is a perspective view of a chain hook, which includes a first rigid bar 1 having two longitudinal members 1a and 1b connected together by a bridging member 16. The first end 10 of the first rigid bar is hinged via a shaft 12 to the first end 20 of a second folding bar 2. The second folding bar 2 is configured to receive a first chain strip at its second end 21 by means of a shaft 26.

[0030] The second end 11 of the first rigid strip 1 is hinged to the first end 30 of the third folding strip 3. When the chain hook is in the closed position, the third folding strip 3 partially covers the second end 21 of the second folding strip 2.

[0031] The first arm 32 and the second arm 33, which are capable of translational movement, extend from the first end 30 of the third folding strip 3. According to an alternative embodiment of the invention not shown in the figures, the first rigid strip 1 may be solid and have a support including a locking mechanism configured to receive the first arm 32 and the second arm 33.

[0032] The chain hook also includes a cap 4 hinged to the first arm 32 and the second arm 33, the cap 4 being equipped with a first fold 40 and a second fold 41 extending perpendicularly to the cap 4. The first fold 40 and the second fold 41 have holes configured to receive the ends of the pushers 320, 330 to form a hinge between the first arm 32 and the second arm 33 and the cap 4.

[0033] The cap 4 may have a retaining device for retaining the second chain strip of the chain, such as a pin 44 or a rod as shown in the figure, so as to define the starting point of the second chain strip of the chain. Figure 4 A first pusher 320 and a second pusher 330 connected to the first arm 32 and the second arm 33 are shown.

[0034] The locking mechanism is arranged to hold the third folding strip 3 onto the first rigid strip 1 when no pressure is simultaneously applied to the first pusher 320 and the second pusher 330. For this purpose, the longitudinal members 1a and 1b of the first rigid strip 1 each have fixed hooks 14 and 15, configured to engage with hooks 34 and 35 respectively provided on the first arm 32 and the second arm 33. This connection can... Figure 2 and 4 This was observed in [the context].

[0035] According to the invention, the chain hook includes a stop 23, which is arranged to be received or rested between the first arm 32 and the second arm 33 of the third folding strip when the chain hook is in the closed position, more specifically, to be received or rested between the ends of the first arm 32 and the second arm 33 for receiving the first pusher 320 and the second pusher 330.

[0036] According to the first embodiment, the stop part 23 is provided at the second end 21 of the second folding strip 2. When the chain hook is in the closed position, the stop part 23 is positioned between the first arm 32 and the second arm 33 of the third folding strip.

[0037] According to the second embodiment, the stop part 23 is disposed in the middle of the first rigid strip 1 and is located on the bridging member 16 connecting the two longitudinal members 1a and 1b of the first rigid strip 1.

[0038] When the chain hook is like Figure 2 and 4 When folded or in the closed position, each end of the first arm 32 and the second arm 33 that receives the first pusher 320 and the second pusher 330 comes into contact with the stop 23 when pressure is applied to the first pusher 320 and the second pusher 330. The stop 23 thus limits the travel of the free ends of the first arm 32 and the second arm 33, and the distance between the ends of the first arm 32 and the second arm 33 and the stop 23 defines the travel of the free ends of the first arm 32 and the second arm 33. In this way, the travel length required for the first arm 32 and the second arm 33 to achieve their symmetrical movement and ensure the proper opening of the chain hook can be predetermined.

[0039] When pressure is applied to the first pusher 320 and the second pusher 330, the chain hook is unlocked by the symmetrical opening of the first arm 32 and the second arm 33. The stop 23 can limit the travel of each of the first arm 32 and the second arm 33 and thus ensure the proper opening of the chain hook.

[0040] It should be understood that if the stop 23 is absent, the different or dissimilar pressures applied to the first pusher 320 and the second pusher 330 will prevent the first and second arms from moving correctly to achieve proper opening of the chain hook. For example, when the wearer applies greater pressure to the first pusher 320 than to the second pusher 330, the free end of the flexible first arm 32 may come into contact with the free end of the flexible second arm 33 and prevent the chain hook from opening correctly.

[0041] In summary, to open the chain hook according to the invention, the wearer applies two pressures simultaneously to the two pushers until the free ends of the flexible first arm 32 and second arm 33 come into contact with the stop 23. Then the hook portions 34 and 35 of the first arm 32 and second arm 33 are released from the hook portions 14 and 15 of the longitudinal members 1a and 1b, thereby triggering the release of the third folding strip 3 and the opening of the chain hook.

[0042] It goes without saying that the present invention is not limited to the example shown, but can be made with various alternatives and modifications that are obvious to those skilled in the art.

Claims

1. A chain hook, comprising: - A first rigid strip (1), the first end (10) of which is hinged to the first end (20) of a second folding strip (2), the second folding strip (2) being configured to receive a first chain strip at its second end (21), the second end (11) of which is hinged to the first end (30) of a third folding strip (3), extending from the first end (30) of the third folding strip (3). Extending from the first arm (32) and the second arm (33), the cap (4) is hinged to the first arm (32) and the second arm (33). The cap (4) is equipped with a first fold (40) and a second fold (41) extending perpendicularly to the cap (4) and is equipped with a retaining device for holding the second chain strap of the chain. When the chain hook is in the closed position, the third folding strip (3) partially covers the second end (21) of the second folding strip (2). -A first pusher (320) and a second pusher (330) integrally formed with the first arm (32) and the second arm (33), - A locking mechanism configured to hold the third folding strip (3) locked to the first rigid strip (1) when no pressure is simultaneously applied to the first pusher (320) and the second pusher (330). The chain hook is characterized in that it includes a stop (23), which is accommodated between the first arm (32) and the second arm (33) of the third folding strip in the closed position of the chain hook, so as to ensure that the first arm (32) and the second arm (33) open symmetrically when pressure is applied to the first pusher (320) and the second pusher (330) at the same time.

2. The chain hook according to claim 1, characterized in that, The stop (23) is rigidly connected to the second end (21) of the second folding strip (2).

3. The chain hook according to claim 1, characterized in that, The stop (23) is rigidly connected to the first rigid strip (1).

4. The chain hook according to claim 1, characterized in that, The stop (23) is rigidly connected to the cap (4).

5. The chain hook according to any one of claims 1 to 4, characterized in that, The width of the stop (23) defines the stroke length of the first pusher (320) and the second pusher (330).

6. The chain hook according to any one of claims 1 to 4, characterized in that, The chain hook includes a locking device to hold the second folding strip (2) locked onto the first rigid strip (1) when the chain hook is in the closed position, the locking device including a hook portion.

7. The chain hook according to any one of claims 1 to 4, characterized in that, The locking mechanism includes, on the one hand, a first pair of hooks (14, 15) rigidly connected to the first rigid bar (1), and on the other hand, a second pair of hooks (34, 35) rigidly connected to the third folding bar (3).

8. The chain hook according to claim 7, characterized in that, The second pair of hooks (34, 35) are rigidly connected to the first arm (32) and the second arm (33).

9. The chain hook according to any one of claims 1 to 4, characterized in that, The first arm (32) and the second arm (33) are flexible in the transverse direction over all or part of their length.

10. A watch, characterized in that, The watch includes a chain equipped with a clasp hook according to any one of the preceding claims.

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