US2429794A

US2429794A - Link for loom harness mechanism

Info

Publication number: US2429794A
Application number: US636947A
Authority: US
Inventors: Carl P Bergstrom; Robert S Schedin
Original assignee: Crompton and Knowles Corp
Current assignee: Crompton and Knowles Corp
Priority date: 1945-12-22
Filing date: 1945-12-22
Publication date: 1947-10-28
Anticipated expiration: 1964-10-28

Description

Oct. 28,1947. I c; P. BE RGSTROM EHTAL 9,79

LINK FOR LOOM HARNESS MECHANISM Filed 090. 22, 1945 2 Shets-$ he et 1 mv E ToRs. CARL I? asfiasmau ROBERT s. swan/N- ATTOR EY Oct. 28, 1947. I c. P; BERGSTROM ETAL 2,429,794

LINK .FOR LOOM HARNESS MECHANISM Filed Dec. 22, 1945 4 I 2 Sheets-Sheet 2 ATTORNEY Patented Oct. 28, 1947 Carl P. Bergstrom-and Robert S. Schedin, Worcester, Mas's.,-as'signors to Crompton & Knowles Loom Works,'Worcester, Mass, a corporation of Massachusetts Application December 22, 1945, Serial No. 636,947

9 Claims. (Cl.'13989) This invention relatesto improvements in harness mechanisms for loomsiandit is the general object of the invention to provide .an improved form of link for the mechanismwhich operates the harness frames.

The harness frames of many looms are lifted positively to form the top shed and are Pulled down by springs to form'the bottom shed. These springs are sometimes-mounted in a frame secured to the floor under the harness frames and operate small levers connected to the harness frames. These socalled pull-down mechanisms generally include a link between the lever and the spring so constructed that either one or two springs can beconnected'to'the link to vary the force exerted on the small levers.

As heretofore made these links have been constructed of spaced parallel sheetv metal side members connected rigidly," as by riveting, to the double hook member. The hook member-becomes worn by the springs, causingthe discarding of the entire link and its replacement by a' new link. It is an important object of our present invention to provide the link with a removableghook member having a restricted part which can be spread to slip over a holding part of the link body, such as a rivet. subject matter of our invention becomes worn it can be readily removed and a new one inserted in its place. I

It is another object of our invention to provide a link of the type described having parallel spaced side members between which extend rivets uniting the side members and providing attaching means for a double spring hook having parts 1 thereof separated by a distance less than the diameter of the rivets and separable to permitremoval of the spring'member. The hook member is removed fromv its normal position by a simple operation readily performed by hand.

With these and other objects inview which will appear as the description proceeds, our invention resides in the combination and arrangement of parts hereinafter described and set forth;

In the accompanying drawings, wherein a'convenient embodiment of our invention is set forth, and wherein two methods of removing the hook member are indicated,

Fig. 1 is a diagrammatic front elevation of parts of a loom showing harness pull-down mechanism equipped with our invention,

Fig. 2 is an enlargedfront elevation of one of our improved links with the hook member in normal position, 1

When the hook forming the Fig. 3 is a plan view lookingin-the direction of arrow 3, Fig. 2,

Fig. 4 is a horizontal section on line 4--4 of Fig. 3,

Figs. 5 and 6 are diagrammatic views similar to Fig. 4 illustrating the preferred manner of removing the hookmember,

Fig. '7 is'a front elevation of the improved resilient hook member, and

Fig. 8 indicates an alternative method of removing the hook member.

Referring particularly to Fig. 1, there is indicated a loom frame l0 su po ting a dobby mechanism II to operate harness frames l2'by means of harness cords l3. Secured to the floor under the harness frames is a pull-down mechanism designated generally at P having side members M in the u'pper ends of which are mounted pivot rods l5. Levers l6 are mounted on the pivot rods It: for vertical movement and'are connected to the bottoms of the harness frames by connectors 11. Elongated horizontally disposed springs to extend between the'frames l4 and are connected to the links L forming the subject'matter of our invention. The outer ends of the links are connected to the'aforesaid levers l6 and the springs are normally operative to exert a downward pull on the harness frames.

The matter thus far described except for the links L is of common construction and may if desired be as set'forth in prior patent to Holmes No. 2,097,665.

In carrying our inveh-tion'into effectwe provide one end, the left'end as viewed in Figs. 2, 3 and 4, with a stud or rivet 20 for engagement with a lever l5. Rivet 20 extends between and fastens together two spaced preferably sheet metal side plates or elements 2| and 22. At the other end of the link the side elements are connected by outer and

inner rivets

23 and 24, respectively. The side elements and rivets'23 and 24, togetherwith rivet 29, form the link body LB. The

rivets

23 and 25 may be considered as a joining means having convex surfaces 25 and 2 6, respectively, the one facing the adjacent end'ofthe body LB and the other facing theopposite end of the body.

The hook member for springs I8 is indicated generally at 30 and is made of a singlepiece of strong resilient wire bent as shown in Fig. '7 and has a U-shaped'inner or left end formed by side arms 3| and 32 preferably parallel and connected by a rounded or closed end member 33 located approximately at the longitudinal center of the wire of which member 30 is made. As shown in Fig. '7 the right ends of the side arms are bowed toward each other to form bends 34 which define between them a normally restricted narrow neck or throat 35 of less width than the diameter of

rivets

23 and 24. Throat 35 is also of less width than the space 36 between arms 3| and 32 with which it communicates and through which the joining means or rivets 23 and 24 pass. For convenience in manufacture the

rivets

23 and 24 are alike, although they need not be, but it is desirable that the throat 35 be narrow enough to prevent accidental slippage of the rivet 23 through it. The side arms substantially surround the rivets and have their free ends bent beyond throat 35 to form oppositely directed hooks 31' for attachment with the springs I8. The hook member will ordinarily be loosely held on the link body, but if desired the bends34 can be so made as to hold the two parts of the link firmly together. As shown in Fig. 2 the adjacent parts of the hooks 3'| curve toward each other in a direction toward the bends 34.

The normal relationship between the link body and the hook member is that indicated in Fig. 2, wherein the

rivets

23 and 24 lie within the substantially enclosed space 35 between the side arms 3| and 32, and the hooks 3'! are accessible for attachment to springs I8; During the operation of the pull-down mechanism P each spring will exert its force through the spring member 30, rivet 24, and rivet 20 of the corresponding link to the associated lever I6 A I g If the hook member 3|) should become worn sufiiciently to require replacement it may in the preferred operation be pushed to the left as viewed in Fig. 2 while the link body is held stationary, thereby causing separation of the hooks due to their resilience or deformability with resultant spreading or widening of the throat 35 to permit rivet 23 to slip through it to the position shown in Fig. 5. By a second push to the left the throat will again be spread and arms 3| and 32 will slip beyond rivet 24 and the member 30 be free from the link body LB, see Fig. 6. During both of these steps the operators fingers will push on the outer rounded convex parts of the hooks 3'! While the thumb of the same hand engages the end of link body LB adjacent to rivet 20. The distance between the

rivets

20 and 24 is somewhat greater than the length of member 30, hence the latter can readily assume the position shown in Fig. 6. After the worn hook member has been removed a new one can be moved to position on link body LB by slipping it through first over rivet 24 and then over rivet 23, arms 3| and 32 spreading apart to open the throat 35.

An alternative method of effecting the second step of removal of member 3|] from link body LB is indicated in Fig. 8. After the parts are as shown in Fig. 5 member 30 can be turned around rivet 24 to atransverse position such as shown in full lines in Fig. 8, after which a pull in the direction of arrow a will spread throat 35 and the hook member can be moved to the free position shown in dotted lines, Fig. 8.

From the foregoing it will be seen that we have provided a simple form of link for loom harness pull-down mechanism in which the link body can be used repeatedly and in which the hook member which is subject to wear can be renewed without discarding the link body. The double hook member is held in normal position by its shape, but can be removed due to its resilience. So far as certain features of our invention are concerned the rivets can be considered as rigid 4 parts of the link body extending laterally from the side elements.

Having thus described our invention is will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and we do not wish to be limited to the details herein disclosed, but what we claim is:

1. In a link for loom harness mechanism, a link body including a pair of substantially parallel fiat spaced side elements, joining means connecting said elements, and a hook member having spaced resilient arms lying in a plane substantially parallel to the planes of said flat elements and formed to define between them a space occupied by the joining means and terminating in oppositely curved hooks lying in said plane of the arms, the latter being bent toward each other to define a throat normally restricted to enable said arms to hold the member in normal position with respect to said joining means, said arms being separable due to resilience thereof to spread said throat to permit said arms to slip over said joining means to remove the member from said link body.

2. In a link for loom harness mechanism, a link body including a'pair' of spaced side elements, joining means connecting said elements, a resilient wire hook member having a U-shaped end forming a space occupied by said joining means said space having at one end thereof a throat normally restricted to enable said joining means to cooperate with said U-shaped end to hold the member in. normal position, said U-shaped end of said member being deformable due to the resilience thereof to enlarge said throat and enable said joining means to pass therethrough to effect removal ofs'aid member from said link body, and a hook on each end of the wire, said hooks curved away from each other and lying in the plane of the U-Shaped end of said member, whereby either hook can pass between said side elements when the hook memberis removed from a the link body.

3. In a link for loom harness mechanism, a

link body including a pair of spaced side elements, joining means connecting said elements, a resilient hook member substantially inclosing said joining means and being held by the latter in normal position on the link body, said member having parts thereof separable due to the resilience thereof and slidable over said joining means to remove the member from said link body, and oppositely curved hooks on said hook member lying substantially in a plane and proportioned to pass between "said side elements. 4. In a link for loom harness mechanism, a link body including a pair of spaced side elements, joining means connecting said elements, a hook member formedof a resilient wire bent at the longitudinal center thereof to form two arms, and hooks formed on said arms bent away from each other in the plane of said arms, the latter being bent toward each other between said joining means and hooks so that said arms substantially surround said joining means to hold the member normally on said link body, said arms being separable to permit passage of said joining means between said arms and enable said member to be removed from said link body.

5. In a link for a loom harness control mechanism, a link body comprising two spaced side plates,- rivets spaced longitudinally of the link 'body adjacent one end thereof and holding said plates together in spaced relation, and a resilient hook member formed as a bent wire having side arms extending on opposite sides of said rivets and having free ends formed as hooks bent away from each other in the plane of said arms, said side arms having parts bent toward each other between said hooks and the rivet adjacent thereto, the distance between said parts being'less than the diameter of said rivet, and said parts being movable apart from each other to slip over said rivet due to the resilience of said side arms.

6. In a link for a loom harness control mechanism, a link body comprising two spaced side plates, rivets spaced longitudinally of the link body adjacent one end thereof and holding said plates together in spaced relation, and a hook member having spaced resilient side arms extending along opposite sides of said rivets and terminating in oppositely directed curved hooks lying in the plane of said side arms, the latter having parts thereof bent toward each other between said hooks and one of said rivets, the distance between said parts "being less than the diameter of said one rivet, said parts being movable apart from each other to slip over said one rivet due to the resilience of said side arms.

7. In a link for loom harness mechanism, a link body having side elements connected together in spaced relation by joining means, a hook member having resilient arms normally substantially inclosing said joining means to hold the member on the body but separable to permit slipping of said arms over said joining means to effect removal of said hook member from said hook body, and oppositely extending hooks, one on each arm, curved away from each other, said arms and hooks being in a plane and proportioned to pass between said side elements.

8. In a link for loom harness mechanism, a link body having side elements connected together in spaced relation by joining means, a hook memher having resilient arms connected to each other on one side of said joining means and having between them a space between said elements through which said joining means extends, said arms being formed on the opposite side of said joining means to form a narrow throat connecting with said space and of less width measured transversely of the link body than the width of said joining means measured transversely of the link body, and oppositely directed curved hooks on the arms beyond said throat relatively to the joining means, said arms and curved hooks lying in a plane and the hook, member capable of passing as a unit between said side elements.

9. In a link for a loom harness control mechanism, a link body comprising two spaced elongated side plates, joining means adjacent to one end of said body securing said plates together and having a convex surface facing said one end of the body and another convex surface facing the other end of the body, a hook member made of resilient wire bent on itself to form a U-shaped part to engage said other convex surface and form side arms each having a free end, a hook on the free end of each arm, and each side arm having a bend therein toward the other side arm between the hook thereof and said U- shaped part, said side arms and bends therein and the hooks all lying substantially in a single plane, adjacent parts of the hooks curved toward each other in a direction toward said bends, said hooks when between said side plates and having said adjacent parts thereof jointly forced in a direction toward said one end of the body against said other convex surface of the joining means causing the latter to separate the bends to permit assembly of the hook member on the body, and said bends when forced jointly in a direction toward the other end of said body against said other convex surface of the joining means being separated by the latter to permit'removal of the hook member from the body.

CARL P. BERGSTROM. ROBERT S. SCHEDIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,097,665 Holmes Nov. 2, 1937 1,907,529 Foure-Roux May 9, 1933 361,175 McCracken Apr. 12, 1887