US3587660A - Wear inserts in dobby jack - Google Patents

Abstract

A SNAP-ON CONNECTING DEVICE FOR A LEVER IN WHICH THE LEVER HAS AN OPENING TO RECEIVE A WEAR INSERT IN A SNAP-IN RELATIONSHIP. THE INSERT IN TURN HAS AN OPENING GOR RECEIVING A TRUNNION OR OTHER CYLINDRICAL PRJECTING PORTION OF A CONNECTOR IN A SNAP-IN RELATIONSHIP.

Description

United States Patent [72] Inventor Raymond F. Dion 2,919,722 l/l960 Alford 139/88 Worcester, Mass. 3,021,307 2/1962 Csendes 1 ..28/Polyurethane [211 Appl. No. 821,428 3,262,469 7/1966 Blakely,.lr... v 139/84 [22] Filed May 2, 1969 3,315,706 4/1967 Butler 139/88 [45] Patented June 28, 1971 FOREIGN PATENTS [73] Assign 388,697 3/1933 Great Britain 139/84 Mass 515,088 11/1939 Great Britain 139/84 459,090 8/1968 Switzerland 139/88 [54] WEAR INSERTS 1N B BBY JACK Primary Examiner-James Kee Chi 12 Claims 6 Drawing Figs- Attorney-Howard G. Garner, Jr [52] U.S.C1 139/84, l39/88,308/238 [51] int. Cl D031: 13/00 [50] Field of Search 139/88, 84,

L (A)28/(P9lyurethane)3080381237 ABSTRACT: A snap-on connecting device for a lever in which the lever has an opening to receive a wear insert in a [56] References cued snap-in relationship. The insert in turn has an opening for UNITED STATES PATENTS receiving a trunnion or other cylindrical projecting portion of 2,911,685 1 1/1959 Macdonald 308/238X a connector in a snap-in relationship.

PATENTEnJunzmsn 3587560 sum 1 0F 2 INVENTOR RAYMOND F. DION ATTORNEY PATENTEUJUNZBWI 3587560 sum 2 [IF 2 minimumH111.

INVENTOR RAYMOND FI DION ATTORNEY WEAR INSERTS IN DOBBY JACK BACKGROUND OF THE INVENTION often the case, the contacting parts are made of metal, a con-.

dition very susceptible to wear.

The wear problem is particularly acute in dobby levers; in looms where the levers are operatively connected to the har'-. nesses through connectors. The dobby levers and connectors are usually made of metal and the constant lowering and raising of the harness causes the contacting parts to wear.

A common solution of the wear problem is the use. of wear or beating inserts. The inserts can be made cheaply and their replacement, when the inserts are worn, is cheaper than replacing the connector or lever. Another advantage is that the downtime of the machine is minimized since replacement of an insert is much simpler than replacing an entire connector or lever unit or waiting until such unit is repaired.

A disadvantage arising out of the use of inserts occurs during machine assembly. Since practically all machineryis massproduced, certain units or subassemblies are assembled in one location and transported to a central location for final assembly. If the wear inserts are part of the subasser'nbly, they may become lost during transportation from one location to another. If the inserts are inserted during final assembly, they a must be held while the connector is assembled to the-lever.

This makes assembly more difficult. This problem is alleviated somewhat by making the inserts so that they will fit snugly into No. 2,911,685 and C. C. Butler, No. 3,315,706.

By force fitting the insert on one of the contacting elements,

the problems of assembly are eased. However, one drawback: is that one of the elements must be held in place against theE wear insert while the other end is fastened. If the element is longer than a man's reach, then two men must be used during.-

assembly of this particular element. If there are several elements such as would be the case in a loom dobby, the assem-- bler must connect one connector at a time between the .dobby jack and the harnesses. The element which has to be held may be a tension roll trunnion as in the case of Macdonald, supra, or dobby connectors as in the case of Butler, supra.

SUMMARY OF THE INVENTION An important object of the present invention therefore is to eliminate all of the above disadvantages by providing a connecting device which is easy to assemble and economical to maintain.

snapped into place on the lever and the connector will be snapped into an appropriate opening in the insert. The'other end of the connector can then be connected to whatever mechanism is operated by the connector without havingto hold the first end. In the case of loom harness connectors, the assembler can connect all of the connectors, to the dobby jacks and then connect the other end of each connector to the harness cords. In addition to original assembly, the invention is also very useful during insertion of a new warp beam in a loom. The present practice is to bring in a new warp beam already drawn in to a set of harness frames. The. harness cords are therefore all disconnected and there is no longer any tension on the connectors. If the connectors were not held in place on the jack levers throughtheir force fit relationship with the inserts, all of the connectors would fall away from the jack levers when-the tension was relieved. With the present connection assembly, however, the connectors will all remain in place and the harnesses will be connected very easily.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will more readily be understood from a reading of the following detailed description in conjunction with the drawings wherein:

FIG. 1 is a side elevation of the novel connecting device as applied to a loom dobby of the type which=has dobby jacks and harness jacks;

FIG. 2 is a fragmentaryelevation,on an enlarged scale, of one end of the connecting device as applied to a harness jack lever, parts being broken away;

FIG. 3 is a fragmentary elevation, on an.enlarged scale, of the other end of the connecting device which is applied to a dobby jack lever, parts being broken away;

FIG. 4 is a perspective view. of a wear or bearing insert;

FIG. 5 is a diagrammatic view of the invention as applied to a dobby of the type in which. the connector connects the dobby jack directly to the harness cord;-and.

FIG. 6 is a fragmentary elevation, on an enlarged scale, of the connector as applied to the dobby jack shown in FIG. 5.

DETAILED DESCRIPTION Referring to FIGS. 1, 2 and 3, the novelconnecting means is shown applied to a loom dobby generally indicated at 10. This dobby is of the type which'has a dobby jack indicated at 12 and a harness jack indicated at 14. The connector itself is generally indicatedat l6 and has two flat parallel bars 18 held; together at their ends by trunnions 20 and 22.

Referring particularly to FIG. 2, the trunnion 20 is shown already in place in an opening 24 in a wear insert 26 which is in turn shown inserted in an opening 28 in a holding member 30. Insert 26 is made of a resilient material having good bearing characteristics, Many types of material could be used but one which has shown good results is polyurethane containing graphite. Synthetic polymer materials such as nylon could also be used. The inserthas to be resilient so that it will deform when being forced through the entrance 29 of opening 28. Once inside the opening 28, the insert will fit snugly as it resumes its original shape. Entrance 29 is narrower than the insert when. the insert is in its relaxed condition so that the insert is restrained in the opening 28. Opening 24 has an entrance 25 which is narrower than the trunnions 20 and 22 so that eitherr of these trunnions can be snapped into the opening 24 and be restrained. Harness jack 14 has a series of V-shaped notches 32 which receive a pair of V-shaped projections 34 of holding member 30. These notches are provided so that the amount of harness shift can be adjusted. Holding member 30 also has a pair of opposed indentations 36 which are made to receive a pair of projections 38 in wear insert 26. The projection will help to hold the inserts in place.

Referring to FIG. 3, the other end of connector 16 is shown connected to dobby jack 12. The same wear insert 26 as shownin FIG. 2 is shown inserted in an opening 40 in jack 12.

Opening 40 has a relatively narrow opening 41 which is similar to opening 29, and a pair of opposed indentations 42 for reception of projections 38.

When the. connections are assembled, an insert 26 is snapped into opening 40 of each dobby jack 12. The connector trunnion 22 is then snapped into opening 24 of the insert. This procedure will then be repeated for each connector and dobby jack. The connectors will then all be held firmly in place while the trunnions 20 at the opposite ends of the connectors are snapped into openings 24 of the bearing inserts in holding members 30. The harness cords are 'operatively connected to jack 14 through a jack eye 46 as shown in FIG. 2.

Referring to FIGS. 5 and 6, the connecting device of the present invention is shown applied to a dobby of the type in similar to opening 29 and a pair of opposed indentations 54 i which receive projections 38 of insert 26 when the insert is snapped into the opening, Several openings are necessary so that the amount oflift of the harnesses 56 can be varied.

The connector which connects jack lever 50 to harness cords 44 is generally indicated at 58 and has a pair of fiat bars 60 held together at their respective ends by trunnions 62 and 63. Trunnion 62 is made so that it will snap into opening 24 of insert 26. Trunnion 63 receives harness cord 44.

During or before final construction, insert 26 is snapped into opening 52 and then the trunnion 62 of connector 58 is snapped into opening 24 ofinsert 26. This is repeated for all of the jacks on the loom and then connectors will therefore all be securely held on their respective jack levers. The other ends of the connectors can then be connected to their respective harness cords.

Although the invention is particularly useful as applied to dobby jacks, it is contemplated that other applications could be made, such as the support arm and tension roll trunnion.

combination of a textile drafting machine.

It is contemplated that modifications could be made to the embodiments disclosed without departing from the scope of the invention.

lclaim:

l. A releasable pivoted connecting device comprising:

a. a first rigid member having an opening, the entrance of which is less than the largest dimension of the opening;

b. a resilient bearing insert, which in its relaxed state has a greater dimension than said entrance and fits snugly in said opening, said insert having an opening with an entrance which is less than the largest dimension of said insert opening; and

c. a second rigid member having a cylindrical portion whose diameter is larger than the entrance of the opening in said insert for snapping into and being pivoted in the opening in said insert.

2. The connecting device as described in claim 1 wherein said insert is made of polyurethane.

3. The connector as described in claim 1 wherein the opening in said first rigid member is incurvate.

4. The connecting device as described in claim 1 wherein the walls defining the opening in said first rigid member have a pair of opposed indentations and said bearing insert has a pair of projections for a snap-in engagement with said indentations.

5. In combination with a loom dobby jack lever having an opening, the entrance of which is less than the largest dimension of said opening, a releasable pivoted connecting device comprising:

a. a resilient bearing insert which in its relaxed state has a greater dimension than said entrance for being snapped into and fitting snugly within said opening, said insert having an opening, the entrance of which is less than the largest dimension of the opening in said insert; and

b. a connector having a cylindrical portion whose diameter is larger than the entrance of the opening in said insert.

6. The connecting device as described in claim 5 wherein said insert is made ofpolyurethane.

7. The connector as described in claim 5 wherein the opening in said first rigid member is incurvate.

8. The connecting device as described in claim 5 wherein the walls defining the opening in said first rigid member have a pair of opposed indentations and said bearing insert has a pair of projections for a snap-in engagement with said indentations.

9. A connecting device for a loom dobby having a dobby jack lever and a harness jack lever wherein said dobby jack lever has an opening, the entrance of which is less than the largest dimension of said openings, said connecting device comprising:

a. a holding member, one side of which is adapted for engagement with said harness jack lever and the other side of which has an opening, the entrance of which is less than the largest dimension of said holding member openmg;

a first resilient bearing insert, one side of which in its relaxed state has a greater dimension than the entrance of the opening in said holding member, said insert having an opening, the entrance of which is less than the largest dimension of the opening in said first insert;

c. a second bearing insert, one side of which in its relaxed state has a greater dimension than the entrance of the opening in said dobby jack lever and fits snugly in the opening in said dobby jack lever said insert having an opening the entrance of which is less than the largest dimension of the opening in said dobby jack lever;

d. a connector, one end of which has a first cylindrical portion whose diameter is larger than the entrance of the opening in said first bearing insert for snapping into and being pivoted in the opening in said first bearing insert, the other end of said connector having a second cylindrical portion whose diameter is larger than the entrance of the opening in said first bearing insert for snapping into and being pivoted in the opening in said second bearing insert.

10. The connecting device as described in claim 9 wherein walls defining the openings in said holding member and said dobby jack each have a pair of opposed indentations and said first and second bearing inserts each have a pair of projections for engagement with the indentations in said holding member and dobby jack, respectively.

11. The connecting device as described in claim 9 wherein said first and second resilient bearing inserts are made of polyurethane.

12. A releasable pivoted connecting device for a dobby jack lever comprising:

a. a first rigid member engageable with and effectively forming part of said lever, said member having an opening, the entrance of which is less than the largest dimension of said opening;

b. a resilient bearing insert which in its relaxed state has a greater dimension than the entrance of said opening for being snapped into the fitting snugly within said opening, said insert having an opening, the entrance of which is less than the largest dimension of the opening in said insert; and

c. a second rigid member having a cylindrical portion whose diameter is larger than the entrance of the opening in said insert for snapping into and being pivoted in the opening in said insert,

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