DE1051580B - Bolt locking for multi-strand link chains - Google Patents

Description

GERMAN

The invention relates to a new type of bolt securing in multi-strand link chains, in particular Lock chains, with cylindrical, smooth, continuous chain pin, which is on the associated Chain wheel comes to rest several times.

In order not to increase the dead chain weight in multi-strand link chains, it has been since It has long been known to use chain pins of the same diameter throughout in such chains. The use of such smooth, continuous chain pins, however, makes special securing devices necessary to prevent the brackets and bolts from shifting in relation to each other. One the simplest type of securing is to split the bolt, i. e., the bolt is with a radial Provided bore into which a split pin, a spring pin or the like. Is used.

For chains whose chain pins are repeatedly on the sprocket for. Comes up, makes this type of security but the attachment of special. Cover flaps necessary for the split pins or the like Safety pins when the chain runs onto the sprocket to prevent damage from the chain teeth to protect.

The most common today are fuses that are inserted into the ring grooves of the bolts. Here has especially the use of snap rings, such as Seeger rings or the like, prevailed, but also divided, Guide rings consisting of two ring halves, which are pushed over by an undivided ring or the like. Are held together, have become known.

These fuses inserted into the ring grooves of the bolt have the advantage that they move quickly Loosen it so that the chain can be opened easily to remove damaged or worn chain parts to exchange. The disadvantage, however, is that the chain pin is used to clamp the locking rings must be pierced around the entire circumference. This increases the bending strength of the bolt considerably reduced, so that the designer is forced to increase the bolt diameter, to ensure the necessary stability of the bolt. However, by doing this, the Chain weight increases, which is very undesirable, especially with long chains.

Furthermore, bolt locks are known from general mechanical engineering in which the bolt is slightly drilled, so that practically only a recess is created, in which one in a side channel the spring-loaded round tip or ball located in the bearing housing is pressed in. Instead of this spring-loaded tip or ball can also use screws, in particular grub screws,

Bolt lock
for multi-strand link chains

Applicant:
SHE LIKED

Feinmechanische Werke G. mb H.,
Eiserf eld / victory

Paul Trippe, Eiserfeld / Sieg, has been named as the inventor

be screwed through the bearing into the bolt recess.

Such bolt securing devices are, however, for a chain whose bearing points are constantly in motion, not suitable.

To provide a pin lock for cylindrical chain pins of the same diameter throughout create, the bolt to produce the receiving bracket for the securing elements, only as little is weakened as possible, the invention proposes that known dowel pins in Recesses in the link plates are located and engage in blind holes in the chain pins, the depth of which is less than a quarter of the bolt diameter.

This arrangement has the advantage that the width of the chain is not affected and the The length of the chain pin does not need to be increased, and the dowel pins come with the outer edge of the tabs close smoothly when the chain runs onto the sprocket through the Tab itself protected.

With chain drives that are subjected to particularly harsh working conditions, it turns out to be Advantageously, the recesses in the link plates, in which the dowel pins are located, with a bitumen or Pour tar-containing mass or one in one between two aligned dowel pins the locking pin lying in the continuous groove of the chain link.

Another advantage, which is already known from other chains, is the locking pin according to the invention is that the chain pins against the secured brackets at the same time against rotation are protected. As a result, in the holes

809 767/281

Claims (1)

of the secured tabs, there is also no wear and tear as a result of twisting. The invention will be explained in more detail with reference to the drawings. 1 shows a plan view with partial section of a double-strand link chain with the pin safety device according to the invention, FIG. 2 shows the view of the same chain, FIG. 3 shows a part of a pin with cut link plates on a larger scale, FIG A dowel pin provided with a hole; made of steel wire to prevent the dowel pins from slipping out, and ao FIG. 8 a specially designed chain link for receiving the locking pin shown in FIG. Each link strand consists of the two outer link plates 1 and 4 and the inner link plates 2 and 3. The links are articulated to form a chain by the chain pins 5. The chain pins 5, which are cylindrical throughout with the same diameter, are only provided on one side with short blind holes 7, as can be clearly seen in FIG. 3, into which dowel pins 6 are pushed. To protect these dowel pins 6 when the chain runs onto the sprocket, the outer plates 1 and 4 have groove-like millings 8 into which the dowel pins 6 insert when the chain is mounted so that they are flush with the outer edge of the plates. The depth of the blind holes 7 in the chain base 5 corresponds to about a quarter of the bolt diameter. This is important with regard to the bending stress on the bolts, because the stability of the bolts is largely retained, so that they do not need to be overdimensioned in order to ensure the necessary security, which is of great advantage for the chain weight. The exact arrangement and the seat of the roll pin retainer according to the invention can be seen particularly clearly in FIG. 3, which is drawn on a larger scale. The dowel pin used, which FIG. 4 shows individually, has an additional bore at its head end into which a tool for pulling out the dowel pin can engage. It is now up to the designer to vary the arrangement of the pin safety device according to the invention as far as possible and to adapt it to the operating requirements. An example of this is shown in FIGS. 5 and 6. Here, exactly as in FIGS. 1 and 2, the chain pins 15 create two strands of link plates, which are formed from the outer link plates 11 and 14 and the inner link plates 12 and 13, to form a double strand Link chain connected to each other. In this embodiment, however, each link strand is protected only once on each chain pin by the dowel pin lock according to the invention. The arrangement of the dowel pins is such that, from chain pin to chain pin, the plate facing the inside of the chain is secured alternately and the plate pointing towards the outside of the chain is secured. In addition, the blind holes 17 in the chain pins 15 are arranged in such a way that the clamping pins 16 come to rest on the insides of the outer plates 11 and 14, respectively. In order to prevent the outer plates from sliding on the chain pin to the outside or towards the middle of the chain, the outer plates are connected by connecting elements 19 which, for. B. may consist of countersunk screws in the tabs, which pass through a sleeve arranged between the tabs, connected to each other and are thus held in their position to each other. As a third variant, which is not shown in the drawings, the dowel pin securing device according to the invention could also be arranged between the two intermediate plates 12 and 13. Such an embodiment would have the advantage that the groove-shaped recesses of the link plates for receiving the dowel pins could lie halfway in the two intermediate plates. In both embodiments there would be the advantage that the chain pins each need to have only two blind holes to accommodate the dowel pin securing device according to the invention. Since the dowel pins used are self-tensioning, they are generally held firmly by themselves in the blind holes of the chain pin. However, if a special safeguard is to be taken to prevent the dowel pins from falling out during the operation of the chain, there is the possibility of pouring the groove-shaped cutouts 8 in the link plates in which the dowel pins 6 come to rest with a bitumen or tar-containing potting compound. At the same time, good corrosion protection for the dowel pins would also be offered. In addition, however, there is the possibility of clamping a locking pin 20 shown in FIG. 7 between the dowel pins in the case of chain drives which start up particularly jerkily and are subject to hard knocks. In order to be able to clamp this locking pin between the dowel pins and also to protect it from damage when the chain runs onto the sprocket, the groove-like millings 8 must be carried out further and extend from one plate hole to the other. The locking pin 20 itself consists of a piece of steel wire, on the ends of which are fastened round nipples provided with collars. The diameter of the attached nipple is chosen so that it can be easily inserted into the clear width of the dowel pins. The exact fit of the securing pin 20 between the dowel pins 6 can be seen in FIG. 8, in which an outer tab is shown in section with the securing pin inserted. Since the dowel pins used in the chain pins lie in their grooves 8 milled into the chain link plates, there is no twisting between the secured link plates and the chain pin and consequently no wear as a result of twisting. If one wants to take into account the wear due to rotation, it is consequently sufficient to provide only the inner plates 2 and 3 or 12 and 13 with grinding bushes 10. Patent claims: 1. Bolt lock for multi-strand link chains with multiple chain pins resting on the sprocket, characterized in that dowel pins (6) known per se are located in recesses (8) of the link plates (1, 4, 11, 14) and in blind holes (7, 17) the chain pin (5, 15)