JPH08316A - Center clasp for band - Google Patents

Abstract

PURPOSE:To eliminate the need of a work for adjusting a locking click, and to assemble a small number of integrated formed parts into a center clasp for a band, which is small-sized and of a complicated form. CONSTITUTION:A hollow pipe 38 is provided in the center of a center clasp main body 31, and an elastic member is stored in the pipe. When locking members 33 are inserted in notches formed on both side thickness parts 34 of the hollow pipe 38 from the outside, both side locking parts 52 are put on both sides of the hollow pipe 38 so that a push rod placed between the locking parts 52 enters the hollow pipe 38 to be brought into contact with the elastic members. Pressing metals 32 connected to both ends of the center clasp main body 31 are provided with locked parts 45 near the tips thereof, whereby, when the pressing metals 32 are superposed on the main body 31, the locking parts 52 and the locked parts 54 are engaged with each other. In this engagement, adjustment for the locking click is not required. The center clasp main body 31, the pressing metals 32 and the locking members 33 are integrally formed by powder molding of metal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to clasps such as wristwatch bands and bracelets, and more particularly to clasps that do not require adjustment of locking claws.

[0002]

2. Description of the Related Art Nakadomes for fastening wristwatch bands include center folding type clasps, three-fold type clasps, and double-opening clasps. Figure 8
In the figure of the center folding type clasp, in the figure, reference numerals 1 and 2 denote bands extending from both sides of the wristwatch. A center folding lid fitting 3 is attached to an end of one band 1, and a frame fitting 4 is attached to an end of the other band 2. Middle folding lid fitting 3
The outer lid 7 is hinged to the tip extension 6 of the frame 5 connected to the band 1, and the locking claw 8 is formed near the tip of the back surface of the outer lid 7.

The method of using the center folding type Nakadome is as follows. First, the wristwatch is placed on one wrist, and the outer lid 7 is passed through the hole 9 of the frame fitting 4 by the other hand. Then, the outer lid 7 is superposed on the frame body 5 by rotating around the hinge portion. After that, when pushing the outer lid 7 with fingers, as shown in FIG.
Is engaged and locked with the locking portion 5a.

In this center folding clasp, since the outer lid 7 is locked by the elastic force of the locking claw 8 and the locking portion 5a, after the clasp is manufactured, the locking claw 8 and the locking are retained. Adjustment work of the portion 5a is required. Further, as the number of times of use increases, the locking claws 8 and the locking portions 5a gradually warp outward, the elastic force becomes insufficient, and a so-called stupid state occurs. Therefore, it is necessary to adjust the locking claws 8 from time to time to correct the elastic force. Further, since the center folding lid member 3 is attached by winding the plate-like tip extension 6 around the frame body 5, manufacturing only this portion requires several steps. The same applies to the frame fitting 4 on the mating side, and simplification of the manufacturing process has been desired.

FIGS. 9 (a) and 9 (b) are views showing a three-fold type clasp. Bands 1 and 2 extending from both sides of the wristwatch 10 are connected by a three-fold type Nakadome 11, and Nakadome 11 and Band 1,
2 and the wristwatch 10 form one loop. The tri-fold type Nakadome 11 has a first link 12 connected to the band 1,
It is composed of the second link 13 and the outer lid 14.

To fit the wristwatch, first insert the arm through the loop, fold the second link 13 on the first link 12, and then fold the outer lid 14 as shown in FIG. 9 (b). The outer lid 1 uses the end portion 14a of 14 as a locking claw, and the hinge joint 12a that connects the first link 12 and the band 1 as a locking portion.
Push 4 in the direction of the arrow to lock.

However, in this three-fold type clasp, since the locking claw 14a and the locking portion 12a are elastically coupled to each other like the center folding type clasp, the locking is performed in the same manner as described in the middle folding type clasp. An operation for adjusting the claw 14a is required. Further, the outer lid 14 requires a step of drawing a metal plate with a press and a step of forming a large number of holes on the side portions by machining, and the manufacturing process is complicated like the center folding type.

FIG. 10 shows a double-opening type (double-door type) Nakadome 20. As shown in the figure, this clasp has a clasp main body 21 which is curved in an arc shape in the center, and the holding metal fittings 2 are provided on both sides thereof.
2 and 23 are hingedly coupled, and the end portions of the press fittings 22 and 23 are hingedly coupled to the bands 1 and 2. Holding metal fitting 2
Reference numerals 2 and 23 have arcuate curves that overlap the clasp body 21.

The clasp main body 21 has column members 21a, 21 on both sides.
This is a configuration in which a is connected by four lateral members 21b, 21c, 21d, 21e. For the metal fittings 22 and 23 on both sides,
Retaining claws 22a and 23a are formed, respectively. The locking claw is a lateral member 21c provided on the center side of the clasp body 21,
It engages with the side surface of 21d.

FIG. 10 (c) shows a state immediately before the double-sided clasp 20 is locked. After this, the locking claws 2 of the press fitting 22
Reference numeral 2a locks the lateral member 21c, and the locking claws 23a of the pressing metal fitting 23 lock the side surfaces of the horizontal member 23a.

However, this double-opening type clasp is also the same as the center-folding type and three-folding type in that adjustment work of the locking claws is required after manufacturing. In addition, the clasp body 21 and the intermediate link 22 have many machining parts, and hence it takes time to manufacture.

[0012]

That is, any of the above-mentioned conventional examples has a problem in that it is necessary to adjust the engaging claws after manufacturing the clasp. There was also a request to make Nakadome's manufacturing process easier. On the other hand, it is possible to divide Nakadome into a small number of parts, integrally mold each part, and assemble it, but since each part that constitutes Nakadome is small and the processing is fine, There are technical and cost problems in mass-producing integrally molded parts by machining.

The present invention has been made to solve the problems of the above-mentioned prior art, and an object of the present invention is to provide a clasp for a watch band that does not require adjustment work of a locking claw. Also,
Another object of the present invention is that adjustment of the locking claw is unnecessary, and further,
The purpose of the present invention is to provide a clasp for a watch band, which can be manufactured from an integrally molded component that is small and has a complicated shape without being machined, and can be manufactured at a manufacturing cost similar to or lower than the conventional one. .

[0014]

To achieve the above object, in the present invention, a clasp main body and a clasp main body which are attached to the clasp main body and are movable back and forth between a locking position and a locking release position, A locking member biased to a locking position by an elastic member is rotatably coupled to one end or both ends of the clasp main body, overlaps with the clasp main body, and locks when the clasp main body overlaps. And a retaining metal fitting having a locked portion that engages with the member, wherein the clasp main body, the retaining member and the retaining metal fitting are integrally formed by metal powder molding.

Alternatively, (a) two thick-walled portions arranged to face each other, a thin plate portion connecting the thick-walled portions in a state of being separated from each other, and a thick-walled portion which intersects the thick-walled portion. A hollow tube extending in the direction, and a notch formed in a thick portion including one side or both sides of the hollow tube and penetrating the thick portion in the width direction to communicate with the surface of the thin plate. With the main body
(b) an elastic member fitted into the hollow portion of the hollow tube,
(c) A push rod that passes through the notch from the outside of the thick portion and enters the hollow portion, and a push rod that comes into contact with the elastic member, is provided apart from the push rod, and passes through the notch and is placed on the thin plate portion. Has a locking portion that is slidable between the locking position and the locking release position on the thin plate portion and is biased to the locking position by the elastic member at the tip, and the rear end is thick. A locking member protruding to the outside of the meat portion, (d) provided at one end or both ends of the clasp body,
A pressing metal fitting, one end of which is rotatably coupled to the clasp main body, overlaps with the clasp main body, and has a locked portion that engages with the locking portion when the clasp main body overlaps. Can also be

Further, it is desirable that the clasp body, the locking member and the pressing metal member are integrally formed by powder molding of metal.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the clasp for a watch band according to the present invention will be described below with reference to FIGS. The clasp 30 according to the present invention includes a clasp main body 31, pressing metal fittings 32 and 32 on both sides thereof, and locking members 33 and 33 attached to the central portion of the clasp main body 31.

In the clasp body 31, the thick portions 34, 34 arranged in parallel are connected by a thin plate portion 35, and the spring rod 4 is provided at both ends.
The pressing metal fitting 32 is rotatably connected by the numeral 2.
The thick portion 34 has an arcuate curve along the longitudinal direction, which is curved along the shape of the arm. There is a step in the vicinity of the center of the thin plate portion 35, and a depressed flat concave portion 36 is formed. In this concave portion 36, a hollow pipe 38 connecting between the protruding portions 37 at the center of the thick portion 34 and the thick portion 34 is formed. It is fixed in the orthogonal direction. Hollow part 3 of this hollow tube 38
A coil spring is inserted as the elastic member 40 into the member 9. A female screw hole 57 is formed in a portion of the recess 36 that faces the protrusion 37.

Further, the hollow tube 3 is provided at the center of the thick wall portion 34.
A notch 41 is formed on both sides of the groove 8. The notch 41 penetrates the thick wall portion 34 in the width direction, and the recess 3 of the thin plate portion.
Together with the upper surface of 6, a substantially rectangular opening is formed. Both ends of the hollow tube 38 open into the notches 41.

One end of the pressing metal 32 is the clasp main body 3
1 is rotatably coupled with a spring rod 42, and the other end is a connecting portion 44.
To connect with the belts 1 and 2 of the wristwatch. A through hole 43 for inserting a spring rod is opened in the connecting portion 44. There is a locked portion 45 at a position slightly apart from the connection portion 44,
The locked portion 45 includes a hole 46 opened in the thickness direction of the pressing metal fitting 32 and a hole 47 penetrating in the width direction of the pressing metal fitting 32. FIG. 4 is a cross-sectional view taken along the line VI-VI of FIG. 1 and shows how these holes 46 and holes 47 communicate with each other.

The locking member 33 has a structure in which a push rod 51 and locking portions 52, 52 projecting to both sides of the push rod are provided at the tip of a base 50 having an arcuate pressing end. are doing. A long hole 53 is opened near the push rod 51 of the base 50.

FIG. 5 is a view showing a state in which the locking member 33 is attached to the clasp body 31. In the locking member 33, the notch 41 is inserted from the outside of the thick portion 34 in a direction parallel to the hollow tube 38, and the locking portions 52 on both sides straddle the hollow tube 38 and the thin plate 3 is formed.
5, the push rod 51 enters the hollow portion 39 and contacts the elastic member 40 inserted in the hollow portion 39. When the locking member 33 fits in the predetermined position, the female screw hole 57 formed in the recess 36 of the thin plate and the long hole 53 (see FIG. 2) of the locking member 33 overlap each other, so that the female screw hole 5
Screw the screw 55 into 7. The diameter of the screw 55 is such that it can be loosely fitted in the long hole 53. If the tip of the screw is projected into the long hole 53, the locking member 33 slides in the direction orthogonal to the clasp body 31. Freely locked. The locking members 33 on both sides are similarly attached to the clasp body 31.

Next, the retaining action of the clasp of the present invention will be described. In FIG. 1, it is assumed that the bands 1 and 2 are previously connected to the facing connection parts of the wristwatch. Pass the wristwatch band through your wrist, and from the state shown in Fig. 1, press both metal fittings 3
1 and 2 is rotated in the direction of the arrow in FIG. 1 (b) so that the press fittings 32, 32 are placed on the clasp main body 31 to obtain the state shown in FIG. Then, when a force in the direction shown by the arrow in FIG. 6 is applied to each of the holding metal fittings 32 and pressed, the locking portion 52 is pushed into the hole 46 of the locked portion 45 of the holding metal fitting, and the locking portion 52.
The hook-shaped bent tip 56 enters the through hole 47 and is locked. In this state, the press fitting 32 is locked to the clasp body 31, and will not come off even if the press fitting is lifted in the direction opposite to the arrow in FIG.

In the case of the center folding type clasp shown in FIG. 8, the watch bands 1 and 2 are separated when the clasp is not locked.
When putting the wristwatch on the wrist or removing it, there is a risk that the hand may be inadvertently dropped and the timepiece may drop on the floor, but if the double-open type is used as in the embodiment of FIG. Also, in the case of the three-fold type clasp, as shown in FIG. 9, the length of the outer lid 14 is shorter than the length of the first link 12, and the outer lid 1
Bring 4 to the center of your arm, as shown in Fig. 9 (b),
There was a large deviation of a from the center of the first link 12, and the first link was off the center of the arm. On the other hand, if the double-open type as in the present embodiment is adopted, such a thing will be eliminated.

To remove this clasp, do the following. Figure 6
The locking member 33 of the clasp 30, which is locked as shown in FIG. 3, is pushed in the direction in which the locking members 33 approach each other as shown by the arrow in FIG. 1 (a) or FIG. The hook-shaped tip 56 of the locking portion 52 comes out of the hole 47, and the locking with the locked portion 45 is released. After that, if the bands 1 and 2 are lifted in the direction opposite to the arrow in FIG. 6, the state shown in FIG. 1 is opened, and the wristwatch can be removed from the arm.

The structure and operation of the clasp of the present invention have been described above, and then the method for producing the clasp is explained. Although the clasp 30 in this embodiment is small, the clasp 30 is quite complicated in shape. Further, for example, the narrowest width of the through hole 47 forming the locked portion 45 of the pressing metal 32 and the size of the tip portion 56 of the locking portion 52 are 1 mm or less, and other similar sizes. There are a lot of places. If such fine processing is machined for each of the parts, the cost will be extremely increased.

Therefore, in the clasp of the present invention, the main body 31, the press fitting 32, and the locking member 33 are integrally formed of metal powder molded products described below. First, a die for the main body 31, the press fitting 32, the locking member 33 and the like is produced. Next, the metal (stainless steel SUS.316L), which is the raw material for middle distilling, is made into powder, and this is mixed with the powder of heat-meltable plastic. This mixed powder is heated to melt the plastic part and inject it into the mold together with the metal powder to form a semi-finished product such as the main body 31, the press fitting 32, and the locking member 33. Since the semi-finished product thus produced contains a mixture of plastic and metal powder, it is heated again to a temperature at which the plastic melts but the metal does not melt, and the plastic is melted out. The semi-finished product which is only the metal powder is heated to such an extent that the surface of the metal powder is melted, and the metal powders are bonded by welding to obtain a product.

In this way, even if the clasp main body 31, the press fitting 32, and the locking member 33 have a fine structure, all that is required is to make a mold, and each component is manufactured as an integral body. Nakadome is completed by assembling a small number of parts. Therefore, the manufacturing process can be significantly reduced.

FIG. 8 is a diagram showing a second embodiment of the present invention. Although the embodiment of FIGS. 1 to 6 is a double-opening type clasp, the clasp 60 of this embodiment is a single-sided clasp and has a structure similar to that of the conventional three-fold type. Nakadome main body 61, press fitting 62
The locking member 33 is formed by powder molding of metal as in the first embodiment. Unlike the first embodiment, the holding metal fitting 62 is connected to only one side of the clasp main body 61 and does not use a locking claw, so that an outer lid is not necessary as compared with the conventional three-fold type.

The clasp main body 61 has the same basic structure as that shown in FIG. 1, and the thick-walled portions 64, 64 are joined by a thin plate portion 65.
The thin plate portion 65 has a recess 66 in which a hollow tube 68 is provided. However, the difference is that the position of the hollow tube 68 is provided at the left end of the drawing, not at the center of the thick portion. That is, it is a configuration in which the clasp body 31 of FIG. 1 is cut near the center. An elastic member 40 including a coil spring is fitted in the hollow tube 68. Notches are not shown in the figure, but of course they are formed. Further, if the length of the clasp body 61 is shortened as shown in the figure, the curve is slightly attached,
Or you don't have to attach it at all. The pressed metal fitting 62 is formed with a locked portion 75. Since the locking portion 52 has the locking portions 52 formed on both sides of the hollow tube 68, the locked portion shown in the embodiment of FIG. Two 45 are arranged side by side. However, the locking portion 52 may be provided on only one side of the hollow tube 68, in which case the locking portion 52 has exactly the same structure as the locked portion 45 of the first embodiment.

In the above-mentioned embodiment, the projection is used for the locking portion 52 and the concave portion is used for the locked portions 45 and 75, but the projection and the concave portion may be replaced with each other. Further, although the thin plate portions 35 and 65 connect almost all of the thick wall portions 34 and 64, they can be divided into a plurality of portions or only a part thereof. Although the coil spring is used as the elastic member 40, other elastic members, such as rubber, can be used. Further, the middle clasp of the present invention can be applied to the middle folding type clasp, though not shown.

Furthermore, the clasp of the present invention is not limited to wristwatch bands, but can be used for various bands such as bracelets.

[0033]

According to the present invention as described above,
Since the engagement between the locking portion and the locked portion is performed by the elasticity of the elastic member, no adjustment work of the locking claw is required, and the clasp is easily manufactured. Moreover, if it is manufactured by metal powder molding, it becomes possible to easily integrally mold even a fine shape,
Nakadome can be assembled from a small number of integrally molded parts to make it compact and the manufacturing process is reduced. Also, if the double-open type is used, there is no risk of falling when fitting it on the arm, and the clasp main body can be brought to the center of the arm.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of a clasp for a watch band according to the present invention, in which (a) is a plan view and (b) is a side view.

[Fig. 2] Fig. 2 shows the state in which the holding metal fittings are being stacked on the main clasp body.
FIG. 2 is a perspective view of a main part as viewed from the cut surface side, taken along line II-II in FIG.

FIG. 3 is a perspective view showing details of a locked portion of the press fitting.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 shows a state in which the locking member is attached to the clasp body.
It is the perspective view which saw along the II-II line of (a), and saw the principal part from the cut surface side.

FIG. 6 is a side view showing a state immediately before locking the clasp of the present invention.

FIG. 7 is a diagram showing a second embodiment of the clasp of the present invention, (a) is a top view and (b) is a side view.

FIG. 8 is a view showing a conventional center folding type clasp, (a) is a perspective view,
(b) is a side view showing a locked state.

FIG. 9 is a view showing a conventional three-fold type clasp, (a) showing a state in which the clasp is opened, and (b) showing a state immediately before locking.

FIG. 10 is a view of a conventional double-opening clasp, (a) is a plan view in an open state, (b) is a side view thereof, and (c) is a side view showing a state immediately before locking.

[Explanation of symbols]

 1, 2 bands 30,60 Nakadome 31,61 Nakadome main body 32,62 Holding metal fitting 33 Locking member 34,64 Thick part 35,65 Thin plate part 38,68 Hollow tube 39 Hollow part 40 Elastic member 41 Notch 45 , 75 Locked part 51 Push bar 52 Locked part

Claims (3)

[Claims] 1. A clasp body (31, 61) and a clasp body (31, 61) attached to the clasp body, movable back and forth between a locking position and a locking release position, and attached to the locking position by an elastic member (40). The biased locking member (33) is rotatably coupled to one end or both ends of the clasp body, overlaps with the clasp body, and engages with the clasp member when overlapping with the clasp body. A retaining metal fitting (32, 62) having a locked portion (45, 75), wherein the clasp body, the retaining member and the retaining metal fitting are integrally formed by metal powder molding. Nakadome for band. 2. (a) Two thick portions (34, 64) arranged to face each other, a thin plate portion (35, 65) connecting these thick portions in a state of being separated from each other, Hollow pipes (38, 68) that are located between the thick portions and extend in a direction intersecting the thick portions, and a thick portion that includes the hollow pipe and extends to one side or both sides thereof, and penetrates the thick portions in the width direction. Clasp body (31, 61) having a notch (41) communicating with the surface of the thin plate portion.
And (b) an elastic member (40) fitted into the hollow portion of the hollow tube, and (c) the elastic member (40) entering from the outside of the thick portion through the notch into the hollow portion. A push rod (51) that comes into contact with the push rod (51) is provided apart from the push rod, passes through the notch and reaches the thin plate portion, and is slidable between the locking position and the locking release position on the thin plate portion. A locking member (33) having a locking portion (52) biased to the locking position by the elastic member at the front end, and having a rear end protruding outside the thick portion, (d) It is provided at one end or both ends of the clasp body, and one end of the clasp body (31, 6)
(1) is rotatably coupled and overlaps the clasp main body, and has a retaining metal fitting (45, 75) that engages with the locking portion (52) when the clasp main body overlaps. 32, 62), and a clasp for a band characterized by comprising: 3. The clasp for a band according to claim 2, wherein the clasp main body, the locking member, and the metal fitting are integrally formed by powder molding of metal.