US2190837A - Dobby chain - Google Patents

Description

' Feb. 20, 1940. w. B. HARRIS 2,190,837

, nosey CHAIN I Filed Jan. 7, 1939.

II' I v boooooo b oo Sumter Wara B.7 7 Q' rrcb* I a f'i Q 4 n attorney Patented Feb. 20, 1940 isms the BOBBY onam Warren E. HarriaMillbury; Mass. Application January 7; 1939, Serial No. 249.793

9 Claims. (oi. 1 9 334) of the pattern pegs. In order to attach the links thereto, it has been customary to bore holes, and

to pass straight pieces of wire therethrough, and shape their ends to form loops which attach to the links connecting with adjacent bars. That structure has many disadvantages, owing particularly to the fact that the bar has been made wood. The pegs which determine the pattern of the cloth are made of iron slightly tapered and threaded with a coarse thread. The woodenbars are drilled with straight holes into which these tapered metal pegs are inserted. When the peg is turned as a screw, the thread of the pin cuts a corresponding thread in the wooden bar and thus servesto hold the parts in place. This requires...that the wood be comparatively soft. Hence, if a peg is changed in position many times, this will wear the hole in the bar badly and thus require replacing the. bar with a new one; Moreover, the tapered peg threaded into a non-tapered hole tends to split the wooden bar and particularly when inserted in the holes near the ends of the: bar which are most used. The peg may also be twisted in too tightly or not be in proper alignment with the hole and thus again injure the wooden bar. These wooden bars are expensive for many reasons, such as the necessity for a skilled workman to pickout straight grained wood and avoid sticks having cross grainswhich break easily. Moreover, there are many operations involved in making these bars, including sawing the wood into slabs, shaping the sides by planer operations and cutting the beveled ends, drilling the peg holes and the link holes, putting in the link wires and bending the same. Any one of these may result in a defect which necessitates throwing away that particularpiece. Also, the link Wire must pass through the bar in straight direction and not interfere with the holes in the bar or weaken the structure seriously. Hence, these Wires do not give the maximum holding power and may slip in position, it being particularly desirable that they be not permitted to turn in the holes and thus throw the bars out of alignment. These, and

structions. I

It is aprimary object of my invention to over come such disadvantages and to provide a dobby chain made of bars and links so constructed and arranged as to give the maximum of efficiency and service. Further objects will be apparent in the following disclosure. t

In accordance with my invention, I propose to make the crossbar of a molded plastic material, and particularly a synthetic resin, having the desired strength and other properties required and toattach it in the chain by linkagemembers which are positioned during themolding operation and maybe so shaped and arranged that they will be immovablyipositioned and will hold the bars properly as required.

Referring to the drawing which illustrates this invention: e Fig. l is an isometric View of a portion of a dobby chain, in which each cross bar has a single row of peg holes;

Fig. 2 is asection on the line 2-2 of Fig. 1;

Fig. 3 is a section on the line 3-3 of Fig. 1;

Fig. 4 shows one of the dobby pegs;

Fig. 5 is a topplan view of one of the pegs;

Fig. dis a detail showing a different form of chain link; 1

Fig. 7 is a modification showing a double row of dobloy peg holes and a different form of attaching link; and

Fig. 8 is a fragmentary View of a further modification showing another form of eyelet.

In this construction, thejcross bars are made of a plastic resinoid, such, as cellulose acetate, sold on the market under the trade name of Tenite, which is a synthetic moldable resin shape and which is capable of being used with the screw threaded dobby pegs to permit their ready removal and insertion as required, I also, propose to form the dobby peg holes in this bar duringthe molding operation, and particularly,

to put the link attachment wires in position and to mold the plastic resin around these wires so as to hold them securely and permanently in place without interfering with the use or the insertion and removal of the dobby pegs.

As shown in the drawing, the cross bar It] may be made in any suitable shape, but as illustrated, it is provided with beveled sides I! and beveled ends it. Each bar is provided'with a single row i (Fig. 1) or a double row (Figs. 6 and 7) of holes l4 therein which are so shaped and arranged as to hold the dobby pegs IS. The holes M are preferably made slightly tapered, such as about 0.008 inch. The pegs l5, as shown in Figs. 4 and 5, are metal pins having substantially cylindrical ends l6 and a flange I! which limits the inward movement of the peg and therefore locates it'- relative to the bar. The peg is also provided with a very. coarse screw thread l8, and this threaded end is tapered slightly and substantially to the same extent as is the hole M of the bar. Hence, when the dobby peg is inserted into the hole l4, it will fit correctly therein and may, because of its being slightly oversize, cut a thread in the comparatively soft resinoid mate.- rial and. thus form its own securing means. The holes l4 are so located and positioned that the required number of pegs may be put in place, and it is intended that these pegs may be changed from one hole to another as required to govern the pattern of the cloth being woven on the loom.

The bar shown in Fig. 1 has but a single row of dobby peg holes which are widely spaced shown in Figs. 6 and 7 which have two rows of holes. In the simplified form of Figs. 1 and 2, the attaching link wire may be shaped as a straight piece going through a hole in the bar and the opposite and projecting ends of each of the links may be bent to form loops 22 arranged to be connected by link 23 with loops of the link wire of adjacent bars. The ends of the wire are preferably bent back far enough so that they will be embedded in the resinoid substance of the bar and thus form closed eyelets from which the link 23 cannot escape. Since, the resinoid material of the bar is molded around the wire 20, the linkage will necessarily stay inposition. It is to be understood that these wires are suitably put in place in the mold, and the resinoid powder is poured around the same and compressed by means of heat and pressure to the desired shape. The peg holes M are simultaneously formed by suitable cores located in the mold. Hence, the whole bar with its assembled link-wires and peg holes may be formed inexpensively in a single casting operation. I

The problem which has been met heretofore in connection with wooden cross bars where double rows of staggered holes are used, is easily solved by this construction, as shown in Figs. 8 and 7. Since a straight wire, shaped and ar ranged as shown in Fig. 1, would be close to a dobby'peg hole and thus weaken the structure somewhat, I preferably shape these connecting wires as shown in order to giveyarious advantages. The wire of Fig. 6, has a bent central portion of a somewhat S-s'hape, so arranged and formed that it will not be close to any of the holes M; Also, the free ends of the wire are bent in opposite directions to form the loops or eyelets 3| and 32 which are located substantially in alignment with the linkage eyelets of the other bars, as permitted by the bent portion 3fl,'so that the tractive force of the linkage in Fig. 6, the outer ends 3 of the wires may. also be substantially S-shaped, so that each wire end lies at an angle to the normal tractiveforce.

Since the end is embedded in the bar, it interlocks with the resinoid material and thus aids further in holding the wire linkage in place. That is, the bent portions 3%, 32 and 3 2 are all $-shaped and these three parts of the wire will each resist the lateral pull on the wire loop and hold the wire rigidly in position. In every case, the centers of the eyelets are in alignment with the direction of travel of the chain, and there is no tendency for the chainbars to twist out of position.

It will now be appreciated that since the bar is made of a molded resinoid it may be easily shaped as desired, and that the holes may be molded therein Without the expense of the drilling operations heretofore required for wooden bars. In particulanthe fastening wires which pass through the bar may now be so shaped that they cannot pull out of place or change in position and theyinterlcck with the resinoid and make a strong and rigid structure. The wooden bars have necessarily required that the wire be straight throughout that portion lo cated within the bar; hence such a wire cannot be permanently locked in place butmay become loose. Moreover, the molded bar permits the use of a linkage wire, which is bent in any-desired shape, and the wire may be arranged prior to the molding step in any location of maximum. advantage. Due to the wire having a crooked central portion and its ends embedded in the resinoid, and particularly to the wire ends be ing bent laterallyas shown in 6, and due to the fact that the wire is reinforced and sup ported in position. by the molded resinoid, there is very little chance of the wire being deformed or pulled out .of'shape or location during use of the chain. Thebar may be provided with threaded holes, and in that case the resinoid may be of the iniusible and very hard type. it is preferred, however, that the resinoid be slightly plastic so that the threads may be cut by turning the pegs therein likean ordinary wood screw. Since the steel peg is normally slightly tapered, the holes in the bar may be tapered to the same extent, so that the parts will fit properly, whereas it would not be possible to drill a tapered hole in a wooden bar as heretofore made. The resinoid moreover is not afiected by moisture and it keeps its shape under the standard conditions of use, as well as having a far The linkage wire passing through the cross .bar may be made in two separate pieces to form the oppositely arranged hooks, and the claims are tobe interpreted as covering this equivalent construction. For example, as shown in 8, a cross bar I having two sets of holes therein may have the hooks or eyelets 40 formed of substantially U-shaped bodies having outwardly turned ends 4! and 42. The ends 42 may lie between two holes in the opposite rows. while the ends 4| may be positioned between adjacent holes in the same row; or any other suitable arrangement may be made for properly posi tioning the parts. It is preferable that both ends of the eyelet be embedded in the bar but one of the ends may be left free, if desired. The

eyelet may take any suitable shape provided an I end or portion thereof is embedded in the resinoid bar and interlocks sufficiently therewith to prevent its being pulled out of place.

It will also be understood, in view of the above explanation, that other moldable materials may be substituted for the resinoid specified to exemplify the invention. For example, the cross bar may be made of aluminum or various alloys used in die casting operations. It is, however, desirable that this substance of which the bar is made be molded in place around the eyelet or hook which serves to fasten one bar to another in the dobby chain. That is, the linkage wire or eyelet is to be secured rigidly in position by the molding operation; hence it is preformed and placed in the mold prior to the insertion of the moldable substance, whether metal or resinoid, that is employed to form the bar.

It will be appreciated that one may make many modifications in this construction and that the above description is to be interpreted as illustrating the principlesof the invention, as well as specific applications thereof, and not as limi tations except as defined by the appended claims.

I claim:

1. A dobby chain comprising a set of cross bars connected together by links, each bar being made of a molded plastic substance and having tapered dobby peg holes therein arranged for receiving and being threaded by the pegs, and linkage members immovably secured in position Without interfering with the peg holes which are arranged for fastening one bar in proper alignment with another.

2. A dobby chain comprising a set of cross bars connected together by links, each bar being made of a molded substance and having dobby peg holes therein and linkage eyelets immovably secured in position during the molding operation which are so shaped and located within the bar as to interlock therewith and prevent removal thereof.

3. A dobby chain comprising a set of cross bars and links connecting them in alignment, each bar being formed of a molded substance and having tapered holes shaped to receive a tapered peg and link members secured immovably in place by the molded resinoid which are bent within the cross bar and so shaped as to prevent their removal.

4. A dobby chain comprising a cross bar made of a molded substance having peg holes formed therein and a linkage member embedded within the bar which has its central portion shaped to avoid passing closely to the peg holes and its outer ends bent and embedded in the bar and forming closed eyelets.

5. A dobby chain comprising a set of cross bars connected in alignment by linkages, each bar being made of a molded substance and having dobby peg holes therein, and linkage members immovably secured within the cross bar by the molding operation, each of which has a bent portion within the bar which prevents removal thereof and a hooked end embedded in the bar and forming a closed eyelet.

6. A dobby chain comprising a cross barmade of a moldedsubstance having rows of staggered dobby peg holes formed therein and a linkage member having a central portion embedded in the bar without interfering with the adjacent dobby peg holes and located at an angle to the direction of tractive force and having its opposite ends embedded in the bar and shaped to form closed eyelets.

'7. A dobby chain comprising a cross bar made of a molded substance having dobby peg holes formed therein and linkage members embedded therein at their central and end portions, each member being shaped to avoid the adjacent dobby peg holes and having its ends bent to form eyelets and further bent at an angle to the direction of tractive force.

8. A dobby chain comprising a set of linked cross bars made of a molded substance which have tapered dobby peg holes therein and linkage members embedded at their central and end portions in the bar in positions which avoid intersecting the peg holes, each member being shaped to provide a central bent portion located between the peg holes and an outer loop forming a linkage eyelet having its free end bent at an angle to the direction of the tractive force involved in using the chain, so that deformation and removal of the linkage member is resisted.

9. A dobby chain comprising a cross bar made of a molded substance having dobby peg holes therein and separate opposed linkage eyelets having hooked ends embedded in and interlocking with the resinoid.

WARREN B. HARRIS.

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