JPS612946A - Stud for chain link with stud - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a stud for a studded chain link.

[Background of the invention]

Many types of chains, especially stud 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. a transverse member inserted in the central part of each link between its two longitudinal legs of circular cross-section and having a concave surface at each end that engages with an inner radius of the longitudinal leg of the link; have To produce a studded chain, the link-forming material in the form of a steel bar 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 end faces of the bar are bent. are welded 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 against the stud in a special pressing device. Secure the stud by crimping the concave end faces on both ends. After the chain is formed in this forming station, it is first sent to a hardening station where it undergoes multiple curing and standardization treatments, and then sent to a testing station 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 formation to replace both the defective stud and the corresponding link.

Since the length of the chain often reaches 1 kilometer or more and its weight reaches several hundred kilograms per meter, the operation of returning the chain to the forming section (and then returning it 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 aforementioned 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. , providing a stud which is movable to a use position in which the halves or parts are spaced apart 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, generally designated l in FIGS. 7-5, is constructed in a known manner to be mounted approximately in the center of the chain link λ. In addition to the two U-shaped ends, the link has two longitudinal legs 3.3' of circular cross-section.

As best shown in Figure 1, the stud/
preferably have U.S. Pat. No. 1I,034. at both ends thereof. ．．
An end surface l formed in a concave shape as described in the specification of No. 010
has.

According to the principles of the invention, the stud l is divided into two separate but interconnected parts j, G, and these parts f, A 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 pressure member. In the embodiment shown in FIGS. 1 to 5, a pin 7 (see FIG. 3) serves as a pressing member and has λ threads r, P, i.e. a left-handed thread at one end;
A hexagonal or other polygonal collar 10 is disposed between these threads and is engaged by a pin rotation tool. In the assembled state of the stud, the outer thread r is half the stud! The recess /: engages with the corresponding internal thread / of 2, and the thread similarly engages with the internal thread 13 of the recess /μ of the stud half B.

FIG. 3 shows that each stud half j, iG has a generally U-shaped part or play)/L/A' at its inner end surface.
(FIG. 5) shows that it is provided with a peripheral shield 13 for cooperating with the device.

[Operation of the present invention]

If a normal defective stud is found in the chain,
this from that link (e.g. by torch cutting)
remove and place a stud of the type described above in its place.

In the initial position, the two stud halves t, A are connected to pin 7
is screwed in such a way that it abuts the bottom of the respective recess λ, /44 so that the two halves are maximally close to each other and the stand is given its shortest overall length. In this position, this stud can be inserted between the two longitudinal legs 3.3' of the linkage as shown in FIG.

In the next step, the pin 7 is rotated against the collar 10 with a Susina or similar tool.

Due to the λ different threaded connections, 7 and 13, the rotational movement of the pin 7 causes a longitudinal movement of the stud halves t, iG in the direction away from each other, and in this way finally these studs The end face l of the half is the leg 3.3' of the ring.
engages the inner surface of the stud and tightens the stud between them. By appropriately selecting the thread type and pitch, the stress for tightening the stud can be increased and the stud can be reliably tightened at the required position between the ring legs. Then two U
The shaped plates /A, /A' are installed by inserting them from both sides into the space between the inner end faces of the stud halves t, A, and then attaching these plates to the weld line 17 as shown in FIG. Fixed by Prior to this, as an obshi 1 pin, pin 7 is attached to the stud half j,
It can be fixed by seven or more welding points.

Actually, two cards) /A, /A'4'! 2
It has two functions. That is, on the one hand, to hide the part of the pin 7 that is released during the stud tightening operation;
On the other hand, it is to strengthen the stud as a whole.

In other embodiments shown in FIGS. 6-r, 1.
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 male pin /g is inserted and guided in a corresponding counter socket 19 of the other stud half j, and the stud half 6' is located between the end of the pin/g and the bottom surface 20 of the socket 19 of the stud half r/. More specifically, the wedge 7' has two through holes 21 in a shell-shaped or cylindrical wall surrounding the female socket 19.

Projects through 2'. Furthermore, the wedges 7' are guided in group forces and J formed on the end face of the male pin 15 and on the inner face of the socket bottom 20, respectively. Also, this stud is the U-shaped plate/A mentioned above.

/A' includes two preferably chamfered U-shaped members n, 3' similar to A'. As is clear from Figure 7.

The wedge 7' is considerably larger than the width or thickness of the stud (f
) It shall have a large initial length.

When placing said stud in the middle of the λ longitudinal legs of the chain link, first the wedge 7' and the U-shaped member Δ, y
While removing the 2 halves r/.

6' are brought into close proximity to each other. In that case, male pin 1
g abuts the bottom of the socket 19, and the stud has its shortest overall length. The stud can be freely inserted between the link legs in this condition. Therefore, 2
The stud halves are 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, cut off the protruding end of the wedge, and then cut the wedge and two U
Weld the shaped part:) 3.23' in the position shown.

[Effects of the present invention]

According to the invention, defective studs can be replaced without requiring complex and costly operations to return the entire chain or parts of it 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, an optional pressure member other than a screw or wedge can be used to effect the tightening of the stud. Instead of double-threaded pins of the type shown in Figures 1 to 5, one end is threaded and the other end is smooth to engage a corresponding smooth recess in a corresponding stud half. A rotating pin can be used.

Further, other modifications are possible within the scope of the spirit of the invention.

The stud 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 chainring and shown in its initial position; FIG. 2 is a similar view showing the stud in the position of use; FIG. Figure 3 is an exploded perspective view showing each component of the stud, Figure μ is a perspective view showing the stud in an assembled state, Figure 5 is another perspective view showing the stud in use, and Figure 6 is an inventive Sectional view showing another embodiment of the stud according to No. 7
The figure is a sectional view taken along the line ■-■ in Figure 6.
8 is a perspective view of two washer parts included in the stud shown in FIG. 7; FIG. C. Stud, 2. Chain link, 3. j
',,.

Claims (1)

[Claims] Comprising one or two halves or parts (5, 6) which connect the stud (1) in close proximity to each other to the two longitudinal ends of the inflexible link (2). be movable from an initial position in which they can be inserted between the directional legs (3, 3') to a position of use in which said halves or parts are separated from each other and clamped between said legs by means of a pressing member; A chain link stud with a stud featuring the following. 2. The rotating pin (7) has two stud halves (5, 6)
The corresponding internal thread (11) in the recess (12) of one stud half serves as a pressing member located between
Stud according to claim 1, characterized in that it has at least one external thread (8) that engages with a thread (8). 3. The pin (7) includes two threads (8, 9), a left-hand thread at one end and a right-hand thread at the other end, and both stud halves (5, 6) ) with the screw threads at both ends (
Stud according to claim 2, characterized in that it has a recess (12, 14) with an internal thread (11, 13) for the stud (8, 9). 4. Stud according to claim 2 or 3, characterized in that the pin (7) has a polygonal collar (10) that is engaged by a tool for rotating it. 5. Stud according to claim 1, characterized in that at least one wedge (7') acts as a pressing member. 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 The end of the pin (18) and the other stud half (5'
) a wedge (7') is arranged between the bottom (20) defining the socket (19) of the socket (
at least one of the shell-shaped walls (22) defining the
Stud according to claim 5, characterized in that it projects through two through holes (21, 21'). 7. The wedge (7') is guided in a group (23, 24) provided on the end of the pin (18) and on the inner side of the socket bottom (20), respectively. Studs according to scope no. 6. 8. Two U-shaped members (16, 16'; 25, 25') to hide the pins (7, 18) when the stud is in use.
8. Stud according to any one of claims 2 to 7, characterized in that a plate inserted from both sides is arranged in the stud.