JPH0143179B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to studs for chain links with studs.

[Background of the invention]

Many types of chains, especially interlocking chains, are equipped with so-called studs or reinforcements, on the one hand to prevent the formation of entanglements and on the other hand to increase their strength. Studs of this type are made of metal transverse members. inserted in the center of each link between its two longitudinal legs of circular cross section, and having concave surfaces at both ends that engage with the inner radii of the longitudinal legs of the link. To manufacture a studded chain, link-forming material in the form of copper bars is heated to a red-hot plastic working state, the material in this state is bent and anchored to the leading link, and then the flat ends of the bar are Weld in a spark butt welder. While the link thus formed is still in the red-hot working condition, the stud is inserted between the longitudinal legs, which are still relatively wide open, and these legs are then pressed into place in a special pressing device of the stud. Secure the stud by crimping the concave end faces on both ends. After forming the chain in this forming section, it is first sent to a hardening section where it undergoes multiple hardening and normalizing treatments, and then sent to a testing section for tensile testing and inspection.

During the inspection, some defects in the studs, such as cracks, may be discovered. In that case,
The chain must be returned to the forming station to replace both the defective stud and the corresponding link.
Since chains often reach a kilometer or more in length and their weight reaches several hundred kilograms per meter, returning the chain to the forming section (and then back to the testing section) is extremely time-consuming. And it's expensive.

[Summary of the invention]

The object of the invention is to eliminate the above-mentioned drawbacks and to provide the possibility of easily and quickly replacing defective studs in studded chain links. The invention therefore comprises two halves or parts which are arranged in close proximity to each other from an initial position in which the stud can be inserted between the two longitudinal legs of the rigid link. The present invention provides a stud which is movable to a position of use in which the halves or parts are separated from each other and clamped between the legs by means of a pressing member.

[Example of the present invention]

Embodiments of the present invention will be described below with reference to the drawings.

The stud, indicated generally at 1 in FIGS. 1 to 5, is constructed in a known manner to be attached to the generally central portion of the chain link 2. Link 2
has two longitudinal legs 3, 3' of circular cross section as well as two U-shaped ends. As best seen in FIG. 4, the stud 1 has at both ends end faces 4, preferably concavely shaped, as described in U.S. Pat. No. 4,036,010.

In accordance with the principles of the invention, the stud 1 is divided into two separate but interconnected parts 5, 6 which are placed in an initial position close to each other as shown in FIG. 2 to the mutually spaced use position shown in FIG. 2, and is clamped between the legs 3, 3' of the link by means of a pressing member. In the embodiment shown in FIGS. 1 to 5, a pin 7 (see FIG. 3) serves as a pressing member and connects two threads 8, 9, a left-hand thread at one end and a right-hand thread at the other end. A hexagonal or other polygonal collar 10 is arranged between these threads, which is engaged by a pin rotation tool. In the assembled state of the stud, the external thread 8 engages the corresponding internal thread 11 of the recess 12 of the stud half 5, and likewise the thread 9 engages the internal thread of the recess 14 of the stud half 6. It is engaged with 13.

FIG. 3 shows that each stud half 5, 6 is provided at its inner end face with a peripheral shoulder 15 for cooperating with a generally U-shaped part or plate 16, 16' (FIG. 5). show.

[Operation of the present invention]

If a defective stud of the conventional type is found in the chain, it is removed from its link (eg, by torch cutting) and a stud of the type described above is placed in its place. In the initial position, the two stud halves 5, 6 are arranged so that the pin 7 rests on the bottom of the respective recess 2, 14, bringing the two halves as close as possible to each other, and the stud has its shortest overall length. Screwed as given. In this state, this stud can be inserted between the two longitudinal legs 3, 3' of the link 2 as shown in FIG. In the next step, the pin 7 is rotated by applying a spanner or similar tool to the collar 10. Due to the two different threaded connections 8, 11 and 9, 13, the rotational movement of the pin 7 causes a longitudinal movement of the stud halves 5, 6 away from each other, and in this way End face 4
engages the inner surfaces of the legs 3, 3' of the ring and tightens the stud therebetween. By properly selecting the type and pitch of the threads, it is possible to create a large tightening stress on the stud and to ensure that the stud is tightened in the required position between the ring legs. Next, attach the two U-shaped plates 16, 16' to the stud halves 5,
6 by inserting them from both sides into the space between the inner end faces of the plates 6 and then securing the plates by weld lines 17 as shown in FIG. Prior to this, the pin 7 can optionally be fixed to the stud halves 5, 6 by one or more welding points.

In practice, the two plates 16, 16' have two functions. This is, on the one hand, to hide the part of the pin 7 that is released during the stud tightening operation, and on the other hand, to strengthen the stud as a whole.

In a further embodiment shown in FIGS. 6 to 8, a wedge 7' is used as a clamping member for the two stud halves or parts 5', 6'. In this case, one stud half 6' has a male pin 18 which is in turn connected to the other stud half 5'.
The wedge 7' is inserted and guided into a corresponding female socket 19 of the stud half 5', and the wedge 7' is located between the end of the pin 18 and the bottom surface 20 of the socket 19 of the stud half 5'. To be more specific, wedge 7'
project through two through holes 21, 21' in a shell-shaped or cylindrical wall 22 surrounding the female socket 19. Furthermore, the wedge 7' is guided in groups 23 and 24 formed on the end face of the male pin 18 and on the inner face of the socket bottom 20, respectively. The stud also includes two preferably chamfered U-shaped members 25, 25' similar to the U-shaped plates 16, 16' described above. As is clear from FIG. 7, the wedge 7' has an initial length considerably greater than the width or thickness of the stud.

When placing said stud between the two longitudinal legs of the chain link, first the two halves 5', 6' are moved together, with the wedge 7' and the U-shaped members 25, 25' removed. Bring to a close position. In that case, the male pin 18 abuts the bottom of the female socket 19 and the stud has its shortest overall length. In this state the stud can be freely inserted between the link legs. The two stud halves are then separated from each other and the wedge 7' is driven into the position shown in FIG. 7, thus tightening the stud between the longitudinal legs of the link. In the final step, the protruding ends of the wedges are cut off and the wedges and the two U-shaped members 25, 25' are welded together in the positions shown.

[Effects of the present invention]

In accordance with the present invention, defective studs can be replaced without requiring the complex and costly operation of returning the entire chain, or portions thereof, from the inspection station to the repair station, as was previously required.

[Modifications of the invention]

Of course, the invention is not limited to the embodiments described with reference to the attached figures. Therefore, optional pressure members other than screws or wedges can be used to effect the tightening of the stud. 1st
Instead of double-threaded pins of the type shown in Figures 5 to 5, the pins may be threaded at one end but smooth at the other end to engage a corresponding smooth recess in the corresponding stud half. You can use pins. Further, other modifications are possible within the scope of the spirit of the invention.

The studs according to the invention can not only be used in the manufacture of chains, but also in the repair of used chains with defective studs.

[Brief explanation of drawings]

1 is a side view of a stud according to the invention inserted into a chain ring and shown in its initial position; FIG.
The figure shows a similar diagram showing the stud in the position of use,
FIG. 3 is an exploded perspective view showing each component of the stud, FIG. 4 is a perspective view showing the stud in an assembled state, FIG. 5 is another perspective view showing the stud in use, and FIG. 6 is a perspective view of the stud according to the present invention. FIG. 7 is a sectional view showing another embodiment of the stud according to FIG.
A cross-sectional view along a line, FIG. 8, is a perspective view of two washer parts included in the stud shown in FIGS. 6 and 7. 1...Stud, 2...Chain link, 3,
3'...Vertical leg portion, 4...Abutting end surface, 5, 6,
5', 6'... parts, 7... pin, 7'... wedge,
8,9...screw thread, 10...tsuba, 11,13...
Screw thread, 12, 14... recess, 18... male pin, 19... female socket, 21, 21'... through hole, 20... bottom of socket, 23, 24... guide group, 22... socket Wall part, 25,2
5'...U-shaped washer.

Claims (1)

Claims: 1. Comprises two halves or parts 5, 6 which, in close proximity to each other, connect the stud 1 to the two longitudinal legs 3, 3' of the inflexible link 2. A chain with studs, characterized in that it is movable from an initial position in which the halves or parts can be inserted between the legs to a use position in which the halves or parts are separated from each other and clamped between the legs by means of a pressing member. Link stats. 2 The rotating pin 7 serves as a pressing member arranged between the two stud halves 5, 6 and has at least one stud half engaging a corresponding internal thread 11 in the recess 12 of one stud half. Stud according to claim 1, characterized in that it has an external thread (8). 3. The pin 7 comprises two threads 8, 9, namely a left-hand thread at one end and a right-hand thread at the other end, and both stud halves 5, 6 have threads 8, 9 at both ends of the pin 7. Stud according to claim 2, characterized in that it has recesses (12, 14) with internal threads (11, 13) for the studs. 4. Stud according to claim 2 or 3, characterized in that the pin 7 has a polygonal collar 10 which is engaged by a tool for rotating it. 5. Claim 1, characterized in that at least one wedge 7' acts as a pressing member.
Stud by term. 6 One stud half 6' has a male pin 18 which is inserted and guided into a corresponding female socket 19 of the other stud half 5' and which connects the distal end of said pin 18 with said other stud half 5'. A wedge 7' is arranged between the stud half 5' and the bottom part 20 defining the socket 19, which wedge 7'
Stud according to claim 5, characterized in that it projects through two through holes (21, 21'). 7. Stud according to claim 6, characterized in that the wedges 7' are guided in groups 23, 24 provided on the distal end of the pin 18 and on the inner side of the socket bottom 20, respectively. 8. To hide the pins 7, 18 when the stud is in use, two U-shaped members 16, 16'; 25,
Stud according to any one of claims 2 to 7, characterized in that in 25' there are arranged plates that are inserted from both sides.