FI56879C - KEDJELAOS - Google Patents

Description

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J & Bfo LBJ (11) UTLÄGGININaSSKRIFT 300 / y • ΛΑ ?? C (45) Patent granted on 10 04 1930 'S * ^ (51) Kv.lk.' / Int.CI. * E 05 B 67/38 P 16 G 15/0 * FINLAND-FINLAND (21) Ptt * nttlh * lc * mu »- Pittntan * eknln | 10T9 / T0 (22) H «k« nl »pi | y» - Ans6kningKSa «17.OU.70 '' (23) Aikupilva — GIMfh« C (d «f 17.0ii.70 (41) Tullut julkliukti - Bllvlt offentllj 10/26/70

Patent and registration authorities. . . . , (44) Date of departure and delivery date. -

Patent and registration authorities Antektn utl «gd och utl. * Krlft # n published 31.12.79 (32) (33) (31) Pyy4« tty «uolkeui - Bsgtrd prloritet 25.0U.69

Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) P 19221U9.9 (71) Rud-Kettenfabrik Rieger & Dietz, 708U Unterkochen / Wurtt., Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (72) Horst Elsässer, Uhterk, Uhterk. Federal Republic-Federal Republic of Germany (DE) (7U) Leitzinger Oy (5U) Chain lock - Kedjeläs

The invention relates to a chain lock whose appearance in the closed state substantially corresponds to the appearance of an oval chain member and which has two parallel longitudinal branches, one of which continues in unison and the other has a slot (C-shape) for hanging the chain members, which can be closed segment.

A chain lock of this type is already known, in which the body is C-shaped and the ends delimiting the insertion gap have projections on each. Above these, a bracket connecting the body ends can be inserted, which can be locked in its closed position by a stepped insert and a bolt (U.S. Patent No. 2,175,504). Such a chain lock does not satisfy all the requirements, because its structure is relatively complicated and it is difficult to make all the parts so economically that, on the one hand, the parts can be matched without post-processing and, on the other hand, the backlash is as free as possible. Another disturbing factor is that the lock consists of four parts, which must be completely separated from each other during assembly and disassembly.

56879

Another known chain lock also has a C-shaped body with locking buckles which can be locked with a bolt in its closed position (DBGM 1 802 938). In this chain lock, the ends of the body are provided with dovetail-shaped projections on which the dovetail-shaped cuts of the closing handle can be pushed. This lock is also expensive to manufacture and is not practicable in such a way that its private parts adhere to each other without backlash.

U.S. Pat. No. 1,395,283 further discloses a chain lock having an 8-shaped body which also has an insertion slot for chain members. In this chain lock, the connecting element consists of a screw, the end of which with a short threaded part extends into a blind hole, which is naturally more difficult to manufacture than the manufacture of a through hole. This known chain lock is also unsatisfactory due to the fact that its range of use is particularly limited due to the 8-shaped design of the body. Thus, for example, passage over gears is out of the question. In addition, the loading conditions of the opposite ends of the screw with the short threaded part are different.

Finally, a chain lock is known which does not have an internal step and which consists of an open chain joint, the opposite ends of which can be connected by a screw disc (movable perpendicular to the plane of the chain joint and pressed against the abutment surfaces at the chain joint ends). There are also shortcomings in this chain lock, because the connecting elements take up a lot of space, there are five parts and passing over the sprockets is not advantageous.

The object of the invention is to provide a chain lock of the type mentioned in the introduction, which consists of small parts and which, if possible, has only one connecting element formed and positioned so that when the lock is closed the connecting element does not protrude from the base at the insertion slot. It is further intended that such a chain lock, despite its asymmetrical structure, is as strong against alternating loads as the known symmetrical chain locks consisting of two articulated halves. This object is solved according to the invention in that the body of the chain lock is provided with concentric, internally threaded slots leading from the end faces of its ends into the threaded slot and the connecting element consists of a threaded screw formed as a tension anchor. at the outlet points on the circular outer surfaces terminate in recesses known per se having sub-cylindrical inner walls with a diameter larger than the outer diameter of the thread and bounded by a threaded bore on a ring surface perpendicular to the threaded drilling axis.

The chain lock according to the invention offers several advantages. Thus, the connecting element has no projections at the insertion slot and thus also does not extend into the free inner circle of the base body, which, on the contrary, is completely usable. Adhesion due to protruding parts is prevented. It is possible to give the chain lock the dimensions and outer circuits of a normal chain joint and to make the chain lock pass over the sprockets and / or pocket sprockets. The manufacture to be explained later is very simple and the same applies to the handling of the lock.

It has proved advantageous to position the bores for strength reasons and taking into account the distribution of stresses in the loaded base body slightly shifted towards the outside of the lock.

The chain lock body may be oval or round and thus made of a normal oval or round chain joint. It is also possible to make the shape different, in particular substantially triangular or D-shaped. If the chain lock is used in conjunction with anti-slip chains for car tires, a certain type of mesh configuration is preferred and the ends of the base frame can be rotated somewhat out of the plane of the base frame, thereby facilitating access to the bores.

When making chain locks in which the body is an open chain joint corresponding in shape to the shape of the connecting element, there are difficulties in hardening the base body to increase wear resistance. In these cases, there has hitherto been a lack of means of controlling the retraction of the base piece during hardening, and as a result there have been either harmful clearances, post-machining or tensioning of the base part in the closed position. The elimination of such drawbacks is possible in the chain lock according to the invention by closing the base body at the insertion gap during the heat treatment 56879 with a narrow bridge of residual material. This insight results in an untwisted base body which, after the connecting element has been put in place, does not have any inherent stresses which would adversely affect the durability of the capped chain lock of the invention.

When making chain locks with a screw as a connecting element, it has proved very advantageous to first carbonize the base body and then carefully cool it, then drill and thread the non-carbonized points, then harden the carbonized edges and finally remove the material bridges. In this way, distortion of the base body is prevented and, in addition, it is ensured that the threads of the bores get into the tough core of the base body 0.

The invention will now be described in more detail with reference to the accompanying drawings, in which several embodiments are shown, so that Figure 1 shows, partly in section and partly in side view, a body of a chain lock according to the invention.

Figure 2 shows a section taken along the line II-II in Figure 1.

Figure 3 is a partially sectioned view of an assembled chain lock having a base body as shown in Figures 1 and 2.

Figure 4 shows another basic frame.

Fig. 5 shows a section taken along the line V-V in Fig. 4.

Figure 6 shows a circular ring-shaped body with the ends made oblique.

Fig. 7 shows a partial section and a partial top view of the insertion slot of the base body according to Fig. 8.

Figures 8 to 13 show the body of the chain lock according to Figures 1 to 3 at different stages of manufacture.

In Figures 1 to 3, the chain lock body is denoted by reference numeral 21. It has a slot 22. The slot 22 has a width of 1.1 times the material diameter of the chain joints of the chain branches to be joined together.

The portions 23, 24 delimiting the gap 22 on the other side of the base body are provided with bores 25, 26 with the same straight line and with internal threads. The bores are intended for a connecting element 27 formed by a threaded pin, which is covered in the region of the insertion slot by a sleeve 28, the outer surface of which coincides with the outer surface of the adjacent body.

The thread is somewhat offset to the outside, but the position is chosen so that the threads of the bores 25, 26 are not located in the hardened area of the base body 21, but in its tough core.

Figures 4 and 5 show a base body 29 consisting of a circular ring with a circumferential recess 30. This base body is also provided with helical bores 31, 32 in the same straight line, into which a screw can be inserted from one side.

In the base body 42 of Figures 6 and 7, the ends 43, 44 are in a slightly oblique position so that the screw can be more easily inserted.

In order to ensure that the base body does not twist during hardening, the manufacturing is carried out as illustrated in Figures 8-13. The starting point for the manufacture in the illustrated example is an oval chain joint 45 with high strength (Fig. 8), which in the first operation is carbonized and gently cooled (Fig. 9). The gap 22 is then milled to one long side, leaving a narrow bridge 46 which prevents the base body from twisting during the heat treatment. After milling, coaxial bores 25, 26 are made and provided with internal threads (Fig. 11). The base body is then hardened and this obtains a hard wear-resistant hard layer in the region of the carbonized edge (Fig. 12). The through-hardened bridge 46, the height of which is approximately 0.1 times the diameter of the chain joint, can be easily removed with a light hammer push, and thus the body 2 of the chain lock according to Figs. It is clear that the basic body of other types of locks can be manufactured in the same way. Of course, it is also possible to start from forged pieces, the shape of which corresponds to the shape shown in Fig. 10.

Claims (4)

6 56879 A chain lock having a closed shape in the closed state substantially corresponding to the shape of an oval chain member and having two parallel longitudinal arms, one continuous and the other having a slot (C-shape) for hanging the chain members, which can be closed by a helical, parallel axis longitudinal chain lock characterized in that the chain lock body (21) is provided with concentric, internally threaded bores leading from the end faces of its ends to the threaded slot (22) and that the connecting element (27) consists of a threaded screw formed as a tension anchor, in the closed position of the lock, the ends are screwed into both bores, which bores at the outlet points on the semicircular outer surfaces of the body end in recesses (50) known per se, having a sub-cylindrical inner wall with a diameter greater than the outer diameter of the thread and engages in helical drilling on a ring surface perpendicular to the helical drilling axis. Chain lock according to Claim 1, characterized in that the bores (25, 26) for the connecting element (27) are arranged to be slightly displaced towards the outside of the lock. A method of manufacturing a chain lock according to claim 1 or 2, characterized in that the body (21) is closed in the region of the insertion gap (22) by means of a narrow bridge (46) of residual material during the heat treatment. A method according to claim 3, characterized in that the body is first carbonized and gently cooled, then drillings and threads are made at the non-carbonated points and that the carbonized edges are subsequently hardened and finally removed from the material.