EP0801907B1 - Bayonet fastener for beads necklaces - Google Patents

Abstract

The lock has a plug section with head (14), stop (25), and shaft (13), and a channel (15), extending from the rear end of the shaft. The string for the pearls is inserted into the channel from the back, and then returned after passing over an abutment (33). The channel ends near the stop, and is in connection with two diametrical openings (28,29) on the stop. The head has a passage (30) near the stop, which extends approx. parallel to the common centre line of the openings. A cut (32) extends from each opening to the passage. The front end of the channel has two guide faces (35,36). These form a wedge, and force the string to one of the two openings.

Description

The invention is based on a bayonet clasp for pearl necklaces with the im The preamble of claim 1 features specified. Such a clasp is known from CH-608 703 A5. With such a bayonet clasp it will Plug-in part attached to one end of the pearl necklace, by means of the thread, on which the pearls of the pearl necklace are lined up. The plug-in part will with its shaft inserted into the hole of the last pearl and fixed. The head of the plug-in part serves to intervene in the receiving part, with which it is connected according to Art a bayonet catch is locked. That known from CH-608 703 A5 Receiving part has a sleeve into which a plug-in part is inserted from both ends can be. A coil spring is provided in the sleeve, the ends of which act on washers that strike protrusions that are nearby the insertion openings of the sleeve are provided and radially inward into the Protrude sleeve. In a first embodiment, the receiving part takes a plug-in part on which has a spherical head that is on opposite areas its outside has two grooves extending from its tip, which are in one Undercut ends. This ball head is inserted into the receiving part that its projections engage in the grooves. By advancing the plug-in part, the disc being pushed back against spring force, and then Twisting the ball head snaps the projections of the sleeve like a bayonet in the undercuts of the grooves of the head; in this position the ball head secured by the force of the coil spring.

In another embodiment of the clasp, which is disclosed in CH-608 703 A5 is, the plug-in part has a head with two diametrically arranged, after outside protruding arms, and the receiving part has to accommodate this Plug-in part in the sleeve two incisions starting from the insertion opening, which end in undercuts, and instead of one as a cover on the coil spring a short sleeve engaging the helical spring is provided, one edge of which is crimped outwards and at the end of the Coil spring rests. So that the spiral spring does not remove this inner sleeve pushes out the outer sleeve, this is provided with a flange at the insertion end, which has an inwardly projecting edge on which the inner Sleeve strikes.

Such receiving parts, into which a plug-in part is inserted from both ends can be easily removed completely from a necklace. The makes it possible to fit into a necklace as you wish or to match your clothes to use different receiving parts or one and the same receiving part can be used for different necklaces or multiple necklaces connect with each other. But there are also known closures, the receiving part is firmly connected to the thread at one end of the necklace and in which can only be inserted from one end of a head part (DE-43 37 616 C2); with such closures, the receiving part cannot simply be changed become. Closing is also known from DE-43 37 616 C2. in their Receiving part of your choice plug-in parts with ball head and plug-in parts with cross head can be inserted, this is a head with two diametrically arranged, arms protruding outwards.

One runs in the plug-in part with ball head known from CH-608 703 A5 axial bore from the rear end of the shaft to the tip of the head. For Attaching to the end of a pearl necklace will thread the pearl necklace from behind pushed through the axial bore, occurs at the tip of the head off, becomes one that runs transversely in a recess at the tip of the head Pin wrapped around, returned to the axial hole and steps out of the rear end of the axial bore. The end of the thread is pulled through the last pearl of the pearl necklace, pulled tight and knotted with the strand of pearl necklace. The advantage of this thread guide is that the shaft of the male part, which is pushed into the hole of the last pearl and glued into it, not to be detached from the pearl for threading the thread must be what is difficult because of the adhesive connection and Pearl can damage. A disadvantage of this type of thread guide is that the thread exposed at the head of the plug-in part, partly in the groove, which for the Bayonet-like engagement in the receiving part is provided. When opening and Closing the clasp can therefore cause friction on the thread, causing this is gradually rubbed through and then has to be renewed.

In the plug-in part with cross head known from CH-608 703 A5 also an axial bore from the rear end of the shaft to the tip of the Head and ends there in a recess in which of the thread which is pushed through the axial bore from behind, a knot is formed, which is so thick that it does not fit through the axial bore. It is also disadvantageous here that the thread is revealed at the tip of the head occurs so that when inserting the head into a receiving part friction on the thread can occur and wear through. It is also disadvantageous that the Tightening the thread is more difficult with this type of thread knotting is.

Another embodiment of a plug-in part avoids these disadvantages which does not pierce the plug-in part axially, but the shaft has an axially extending has diametrically continuous slot, which at one point by a transverse pin is bridged. The thread of the pearl necklace is around this Pen wrapped around, returned, pulled tight and knotted with itself. With this type of thread guide, the thread does not reach the Head of the plug-in part and can therefore when opening and closing the clasp not be worn out. However, this is bought with the disadvantage that to change the thread that glued into the last pearl of the pearl necklace Each time the plug-in part has to be detached from the pearl.

The present invention has for its object to show a way how to get a bayonet clasp of the type mentioned, in which the thread with which the plug-in part is attached, on the one hand, in front of one Wear is protected by the plugging process on the head and on the other hand can be easily changed.

This object is achieved by a clasp with the specified in claim 1 Characteristics. Advantageous developments of the invention are the subject of dependent claims.

In contrast to the prior art, the abutment is located around which the thread is looped around, neither at the tip of the head nor in the Shaft of the plug-in part, but in the head close to the stop, which the Marked boundary between the shaft and the head. The abutment is formed due to the rear boundary of a transverse one in the head close to the stop Passage through which the thread is drawn. To the Thread the thread into this passage and into the lengthwise one in the shaft To be able to return the canal, the longitudinal canal ends near the stop and has two diametrically arranged openings in the stop Connection. One inserted into the longitudinal channel from the rear end Thread can emerge from one of these two openings through the transverse one Passage inserted and through the other, opposite opening reinserted into the longitudinal channel and from its rear Be pushed out at the end. If the thread is pulled tight, it is sunk in the two incisions open to the outside, which transitions between the form the longitudinal channel and the transverse passage. In these The thread is open to incisions, but is subject to induction and when opening the bayonet-like engagement of the male part and female part none abrasive stress because the bayonet-like engagement does not hit the stop, but rather at the front of the plug part.

The two openings with which the longitudinal channel connects stands, can be provided directly adjacent to the stop in the head part , but they can also extend beyond the stop and partially lie on the head, partly on the shaft. It is even possible to use the two openings of the longitudinal channel adjacent to the stop on the shaft to provide; even in this case, in combination with the cuts and the spherical surface of the last pearl receding from the stop the possibility of pushing the thread out of one opening from behind and through the opposite opening back into the longitudinal one Insert the channel, although the plug-in part is in the hole as far as it will go the pearl is stuck. Exit and reentry of the thread take place immediately Neighborhood of the attack takes place where they use the clasp do not bother. Nevertheless, a new thread can be pulled into the plug-in part take place during this in the last pearl of the pearl necklace until it stops plugged.

The longitudinal channel can be an axially running bore in the shaft, which branches towards the two openings. But it is also possible to get one longitudinally slotted shaft to use because the longitudinal slot through the The shaft surrounding the pearl in which the shaft is inserted is closed anyway a closed channel is added.

The passage provided in the head can be a bore running transversely in the head which are parallel to the alignment of the two openings of the channel should, in order to keep the incisions connecting them short. The distance of the Cross drilling from the openings of the longitudinal channel is preferred kept as low as possible and is best not more than 1 mm. The path for the thread in the head becomes particularly short when the cross-running one Passage intersects the two openings of the longitudinal channel.

The stop can be formed by a collar surface at the rear end of the head his. This training is recommended for a plug-in part with a ball head. The attack can also be formed by a collar; this training is recommended for a plug-in part with cross head.

In order to be able to thread the thread more easily into a plug-in part, it is known to attach it a flexible, blunt needle. If you run them from behind into the channel that ends near the stop, it tends to end at the end of the To butt channel. The same applies if you pull the thread without help Wants to insert the needle. To counter this, you could go through one of the diametrical openings arranged to insert an eyelet or a hook into the channel to pull the tip of the flexible needle towards the opening. More elegant solves but preferably the unthreading that at the front end of the longitudinal channel provides two baffles, the one from the rear Thread inserted at the end of the channel - with or without the help of a needle inserted - forcibly lead to one of the two openings. Preferably form the guide surfaces - in a through the two diametrical openings Longitudinal section viewed - a wedge, the apex of the rear end of the longitudinal channel is turned. The tip of the needle or thread inevitably hits one or the other guide surface, being indifferent is which of the two guiding surfaces it meets, and is inevitably caused by these passed to one or the other opening, it being particularly favorable if the guide surfaces are concave.

A plug-in part according to the invention can include the channel with its openings and including the passageway by casting, wherein by using a mandrel with a correspondingly convex design also pour concave baffles. Another option is an axial bore near the stop in two sloping ends To let holes branch. Such a plug-in part can also be cast; but one could also use a plug-in part with initially only an axial bore, pour with transverse passage and cuts and the diametrical Subsequently create openings in the channel by removing the channel from the Incisions drilled obliquely. Another option is one To pour plug-in part, the shaft has a continuous slot and then the front end of the slot from both sides with one Trimming milling disc, which results in two concave guide surfaces, their Radius of curvature corresponds to the radius of the milling disc.

The invention is suitable for plug-in parts with cross head as well as for plug-in parts with ball head and can be used for all types of receiving parts mentioned at the beginning be used.

Figur 1

zeigt ein Aufnahmeteil einer Bajonettschließe für eine Perlenkette im Längsschnitt,

Figur 2

zeigt ein zu dem Aufnahmeteil in Figur 1 passendes Steckteil in einer Seitenansicht und in

Figur 3

in einer Draufsicht,

Figur 4

zeigt den Längsschnitt IV-IV durch das Steckteil,

Figur 5

zeigt ein Steckteil mit Kreuzkopf in einem Längsschnitt entsprechend der Figur 4, und

Figur 6

zeigt ein zu dem Einsteckteil gemäß Figur 5 passendes Aufnahmeteil in einer Seitenansicht.

The attached drawings serve to further explain the invention.

Figure 1

shows a receiving part of a bayonet clasp for a pearl necklace in longitudinal section,

Figure 2

shows a fitting to the receiving part in Figure 1 in a side view and in

Figure 3

in a top view,

Figure 4

shows the longitudinal section IV-IV through the plug part,

Figure 5

shows a plug with cross head in a longitudinal section corresponding to Figure 4, and

Figure 6

shows a receptacle part matching the plug-in part according to FIG. 5 in a side view.

The same or corresponding parts are in the two embodiments designated with matching reference numbers.

The receiving part shown in Figure 1 has a cylindrical sleeve 1 with a Insert opening 2 at one end and with a bottom 3 at the opposite The End. In the vicinity of the insertion opening 2 are two diametrically opposite one another Pins 4 and 5 are provided, which in the wall of the sleeve 1st stuck and project inside. So that it doesn't push outwards can be, an outer sleeve 6 is pushed over the sleeve 1, which with the front edge of the sleeve 1 is flush and there has a flange 7, which as an assembly aid for positioning the receiving part in one Jewelry part, which in turn serves as part of a clasp at the end of a Pearl necklace can be attached. The outer sleeve 6 is e.g. by soldering on the Sleeve 1 fixed. Between pins 4 and 5 on one side and the bottom 3 on the other side a helical spring 8 is clamped. Between the coil spring 8 and the pins 4 and 5 there is a disc 9, which of the Coil spring 8 is pressed against the pins 4 and 5.

This receiving part fits on a plug-in part with a spherical head, as in FIGS. 2 shown to 4. This plug-in part has a shaft 13, which on its one End carries a ball head 14, which begins two near its tip Has grooves 16 and 17, which are initially a bit parallel to the longitudinal axis of the plug-in part, then bend at right angles and stretch a little extend far in the circumferential direction until they finally in an undercut 18th end up. These grooves 16 and 17 engage when inserted into the receiving part (FIG 1) one of the pins 4 and 5 in and passes through for a bayonet lock typical combined sliding and rotating movement in the respective Undercut 18 and is held therein by the force of the coil spring 8. When the ball head 14 is inserted into the receiving part, the ball head strikes the disc 9 and pushes it back against the force of the spring 8.

A longitudinal, substantially cylindrical channel 15 extends from rear end of the shaft 13 to almost the front end of the shaft 13, which is formed by a stop 25 which has a collar surface on the Back of the head is 14. At its end, channel 15 branches into two arcuate sub-channels 26 and 27, which are diametrically opposed to two Open openings 28 and 29, some of which in front of the stop 25 in the lateral surface of the shaft 13 and partly behind the stop 25 in the head 14. Parallel to the center line passing through the two openings 28 and 29 runs slightly Distance from the stop 25 across the head 14 is a passage 30, which through incisions which extend to the shaft 13 and are open to the outside 31 and 32 is connected to the branch channels 26 and 27. Through the passage 30, the incisions 31 and 32 and through the branch channels 26 and 27 an abutment 33 delimits around which a thread 34 is looped can, which is inserted from behind into the channel 15, for example exits through the branch duct 26, passed through the passage 30, through the branch channel 27 reintroduced into the channel 15 and from it rear end is led out. The thread 34 is to the illustration not to be disturbed, only shown as a line. If the thread is pulled tight, he is sunk in the incisions 31 and 32. The two rear sides of the abutment 33, which delimit the branch channels 26 and 27, are concave Guide surfaces 35 and 36 formed, which meet in a vertex 37 and are helpful, the thread 34 from the channel 15 through one of the openings 28 or 29 lead out and when reintroducing through one of the two openings 28 and 29 in the channel 16 towards its rear end.

The plug-in part shown in Figure 5 has a instead of a ball head Cross head 19, at the rear end of which there is a collar 20, the Back forms a stop 25, up to which the shaft 13 in the bore a pearl is pushed. At the crosshead 19 are two diametrically arranged projections 21 and 22 projecting radially outwards, which are cylindrical are. The crosshead has one for easier insertion into a receiving part Nose 23 with a chamfer 24. A matching receiving part is shown in FIG. 6; in contrast to the receiving part shown in Figure 1 instead of two radial pins 4 and 5 in the casing of the sleeve 1, two incisions 10 and 11, which start from the edge of the insertion opening 2, initially Extend a bit parallel to the longitudinal axis of the sleeve 1, then bend at a right angle and run a bit in the circumferential direction until they finally end in an undercut 12. The helical spring 8 is not supported on one Disc, but on a ring 38, which is fixed to one in the sleeve 1 Retaining ring 39 strikes.

When inserting the plug-in part with cross head (Figure 5) into the receiving part according to Figure 6 engages the nose 23 through the opening of the ring 38. The radial Projections 21 and 22 can only get into the undercuts 12 if they have previously pushed the ring 38 back against the force of the coil spring 8. As soon as the projections 21 and 22 lie in the undercuts 12, presses the coil spring 8 the ring 38 against the pins 21 and 22 and thereby holds them in the undercuts 12.

Claims (11)

1. Bayonet joint for pearl necklaces with one or two male connector parts to be attached to an end of the pearl necklace and with a female connector part receiving the said one or two male connector parts, with the respective male connector part having a head (14, 19), a shaft (13), a stop positioned between the head and the shaft and a longitudinally running channel starting from the far end of the shaft (13) and through which a string, onto which the pearls of the pearl necklace are threaded, can be introduced from the far end into the male connector part and can be returned after wrapping it around an abutment (33),
   characterized in that the longitudinally running channel ends near the stop and is connected to two diametrically positioned openings (29) at the stop, that in the head (14, 19) close to the stop there is provided a crosswise pass (30) running approximately parallel to the common centerline of the two openings and that an indention (31, 32) is provided extending from each of the two openings (29) to the pass (30).
2. Bayonet joint as defined in claim 1, characterized in that the indention (31, 32) runs at least up to the straight line of the shell surface of the shaft (13).
3. Bayonet joint as defined in claim 1 or 2, characterized in that the openings (29) are located partly in the shaft (13) and partly in the indention (31, 32).
4. Bayonet joint as defined in claim 1 or 2, characterized in that the openings (29) are located in the shaft (13) directly adjacent to the stop.
5. Bayonet joint as defined in one of the foregoing claims, characterized in that the distance between the pass (30) and the two openings (29) of the longitudinally running channel is not more than 1 mm.
6. Bayonet joint as defined in one of the foregoing claims, characterized in that the stop is formed by a flush surface on the far end of the head (14).
7. Bayonet joint as defined in one of the claims 1 to 5, characterized in that the stop is formed by a collar (20).
8. Bayonet joint as defined in one of the foregoing claims, characterized in that at the front end of the longitudinally running channel two guide surfaces (35, 36) are provided which forcibly guide a string which is introduced from the far end of the channel to one of the two openings (29).
9. Bayonet joint as defined in claim 8, characterized in that the guide surfaces (35, 36) form a wedge, the apex (37) of which faces the far end of the longitudinally running channel.
10. Bayonet joint as defined in claim 8 or 9, characterized in that the guide surfaces (35, 36) are concave.
11. Bayonet joint as defined in claim 8, characterized in that the guide surfaces (35, 36) are formed by two branch channels (26, 27) which are slantedly directed to the rear and run from the two openings (29) to the end of the longitudinally running channel.

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