US1314798A - John c - Google Patents

Description

human spares remand op nion.

JOHN C. GREEN, 0F PALMER, MASSACHUSETTS, ASSIGNOR T0 DRAPER CORPORATION,

0F HOPEDALE, MASSACHUSETTS, A. CORPDRATION OF MAINE.

CLAMPING DEVICE FOR HEDDLE BARS OR SUPPORTS.

Application filed March 7, 1919.

To all whom it may concern:

Be it known that 1, JOHN C. GREEN, a citizen of the United States, residing at Palmer, county of Hampden, State of Massachusetts, have invented an Improvement in Clamping Devices for Heddle Bars or Supports, of which the following; description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to loom harness frames and has for its particular object the provision of a lamping device for holding in place the detachable heddle support when the latter is inoperative position.

The invention is an improvement upon that disclosed in the patent to E. S. Stimpson and Charles Short No. 7%,401 granted December 8, 1903, and the main object-of the improvement is to provide a construction in which wear and lost motion in the clamping device shall be reduced as much as possible and in which the device shall be steadied and guided in its movements between its operative and inoperative positions.

The nature ofthe invention will appear more fully from the accompanying description and drawings and will be particularly pointed out in the claim.

The drawings illustrate so much of a loom of an ordinary type as is sufficient fora disclosure of the invention together with the preferred form of the invention embodied therein.

In the drawings 4 Figure 1 is a front elevation of a portion of one of the harness frames shown sub stantially full size;

Fig. 2 is a view of the construction shown in Fig. 1 lookino' toward the right of Fig. 1;

Fig. 3 is a view in horizontal cross section taken on the line 33 of Fig. l;

Fi 4c is a view-similar to Fig. 1 showing the ownhold in raised or inoperative position.

The invention has to do with that type of loom in which the loom harness frames are fitted with flat thin metal heddles which generally serve also as warp stop motion controlling detectors. These heddles are slotted at their upper ends and supported by a fiat heddle bar. Tn order that the heddles may be removed from and replaced upon this heddle bar as required it is removably Specification of Letters Patent.

Patented Sept. 2., EH9,

Serial No. 281,121.

mounted at its ends in the heads of the harness frame and it is necessary to provide a suitable means for clamping or locking the heddle bar in the head of the harness frame.

The constant raising and lowering of the harness frame in the formation of the shed and the constant vibration of the harness frames which is loosely mounted due to the ar and shock of the loom operation places a continual strain and jar upon any clampmg device which may be employed for locking the heddle v supporting .bar in place. Furthermore, it is not connnerciaily practicable to make the parts of carefully machined hardened steel and these parts are usually and necessarily made in the form of castings which are sometimes chilled. Consequently it is found in practice that the parts of the clamping device and the head of the harness frame so wear and cut into each other as after a time to cause under.-

able noise and rattling, permit a corable amount of lost motion and int-1? with the effective positioning and operation of the harness frames.

These results are prevented and these difiiculties obviated in this invention by providing an additional feature to the construction disclosed in'the before mentioned patent to Stimpson and Short.

The construction at each side of the loom frame is the same so that it will be necessary to describe only that at one side.

The head 1 is provided with a threaded boss 7 to receive the usual side bar of the harness frame and with an upward projection 8 having an aperture 9 to receive the usual connecting device. The body of the head is provided with the longitudinal slot 10 and at its upper portion the head is widened at 11 to present the overhanging shoulder 12 at the inner edge of the head. The longitudinal slot 10 is narrowed at its lower portion to form a seat, having its side Walls slightly converging toward the bottom, for the heddle bar and a transverse pin 13 eXtends through the head across this seat.

The heddle support or bar 14: is a flat bar slightly wedge-shaped as illustrated and notched at 15 to fit over the pin 13 when the heddle support is in its operative position in the harness frame. The heddle support is held locked in its operative position by the downhold- This downhold has a shank 16 movable in the longitudinal slot 10. .At the This enlarged section is of such a size inner end of the shank 16 the downhold is provided with an enlarged section 17 preferably of a width equal to thatbf the head.

when the downhold is in operative position shown in Fig. 1 it will fit against the. inner edge of the head beneath the overhanging shoulder 12 and on top of the heddle support 14. Preferably the enlarged section 17 and the shank 16 of the downhold have a groove 18 at the bottom edge to fit over the heddle support. Preferably also the overhanging shoulder 12 and the upper surface of the enlarged section 17 are beveled so that there is a camming or wedging action between these shoulders.

In this invention the downhold is provided with a tongue 19 extended upwardly from the enlarged section 17 and of a width 'suflicient to fit closely in the longitudinal slot 10 of the head. This tongue thus acts to prevent any lateral or rocking movement of the downhold in the slot 10 and gives a wide and extended bearing surface between the downhold and the head so that as the downhold is moved between its inoperative 'minimized. The tongue thus acts'not the wear will be only to steady and seat firmly the entire downhold in the slot of the head but it also acts to guide and afford an additional bearing for the downhold in its movements. When the downhold is raised to its inoperative position as-shown in Fig. 1 this tongue 19 pro- 'jects up alongside the inner edge of the head.

The downhold as in the patent to Stixnpson and Short already referred to has its shank 16 prolonged outwardly to form a preferably cylindrical extension 20. A helical spring 21 is mounted on this extension abutting at one end a washer 22 seated at the outer edge of the head 1 and abutting at the other end a washer 23 held in place by a cotter pin 24. The expansive force of this spring always tends to draw the downhold outwardly to bring the enlarged section 17 against the inner edge of the head and also when the downhold is moving to operative position and the inclined shoulder 12 is in engagement with the enlarged section to cam the downhold downwardly into engagement with the heddle support.

The operation of the device is readily unand operative positions that was;

derstood and is fully set forth in the before mentioned patent. When it is desired to remove the heddle support the downhold is pressed inwardly against the tension ofthe spring 21 and then raised to a position as shown in F ig. 4. It is held in this raised or inoperative position by the enlarged section 17 catching against the inner edge of the head. The heddle support can now be.

removed and replaced. To restore the looking device to operative position it is pressed downwardly and as soon as the upper edge of the enlarged section 17 passes the shoulder 12 the spring moves it automatically into locking position.

During these movements of the locking device the tongue 19 slides in the slot in the widened portion 11 of the head, materially .assists in guiding the downhold, and when the downhold under the shock and jar occurring in the operation of the loom so that the heddle support is always firmly locked 'in position.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is:

A loom harness frame comprising a side bar having a head provided with a longitudinal slot and widened at its upper portion to present an overhanging shoulder at its inner edge; a detachable heddle support adapted to be seated at its end in the lower portion of the slotted head; and a downhold having a shank movable in said slot, an enlarged section at its inner end adapted to be positioned at the inner edge of the head beneath the shoulder to lock the heddle support in operative position, and a tongue extending upwardly from said enlarged section fitting the slot in the head when the downhold is in operative position, guiding the downhold in its moyement and projecting up alongside the inner edge of the head when the downhold is, in inoperative position.

In testimony whereof, I have signed my name to this specification.

JOHN C. GREEN.

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