US2028731A - Loom protection mechanism - Google Patents

Description

Jan; 21; 1936. c, [1 WN 2,028,731

LOOM PROTECTIN MECHANISM Filed Nov. 2:5, 1934 INVENTOR.

W/TNESJ. I CA EL 0 BROWN.

CZl/YTON S. CoauE/v. BY

ATTORNEY.

Patented Jan. 21, 1936 UNETED STATES PATENT OFFICE LOOM PROTECTION NIECHANISM Carl D. Brown, Hopedale, Mass, assignor to Draper Corporation, Hopeda-le, Mass, a corporation of Maine The present invention pertains to loom protection mechanism and has more particular reference to the type of such mechanism wherein a dagger is engageable with a frog for suddenly a and forcibly stopping the loom.

It is customary to mount the frog of protection mechanisms so that it can slide along the loom frame, the frog being provided with a cavity.

whichhouses a clock of resilient rubber material, This block engages between a fixed thrust wall and an end wall of the frog whereby it serves as a cushion to lessen the shock occasioned by engagement of the dagger and frog. As previously constructed, the cushioning block has been of such a size as to substantially fill the frog cavity when unstressed. The block could not be made smaller in cross-section than the cavity as it would then buckle upon being subjected to the stress of bang-01f, and would accordingly fail to impart sufficient resistance to movement of the frog.

Considerable difficulty has been experienced with loom frogs, they breaking frequently for no apparent reason. I have found that this breakage may be traced to the cushioning block. That is, the block when compressed in the direction of movement of the frog tends to expand in other directions and, since there is no room in the frog cavity for such expansion, the frog may literally be burst open. I propose to provide a protection mechanism wherein the frog is not subject to bursting as aforesaid and wherein the cushioning block is still supported and guided by the frog cavity so as to prevent lateral buckling of the block.

To the end mentioned the invention is comprised of a construction which includes a slidable frog having a cushioning block in a cavity therein, wherein the cushioning block is comprised of alternate layers of a resilient rubber material and a relatively rigid material, and

. wherein alternate of the layers are substantially co-extensive in width and height with the cavity, to prevent buckling, while other layers are of lesser extent to thereby provide space for expansion of the rubber layers. In the preferred embodiment, herein disclosed, the relatively rigid layers are formed of leather, and the rigid layers are the ones chosen to have the greater dimensions. The invention in its broader aspects is not, however, limited to this particular embodiment.

The said preferred embodiment is illustrated on the accompanying drawing, of which:

Fig. 1 is a view, partly in section and partly in elevation, showing the parts in assembled relation;

Fig. 2 is a plan view of the frog with parts thereof broken away and appearing in section; and

Fig. 3 is a perspective view of the novel cushioning member detached from the loom.

The loom which I have selected to illustrate my invention is generally of conventional construction not of the present invention and accordingly it is but fragmentarily illustrated. There is shown a portion of a left hand loom side I, a protector rod 2 carrying dagger 3, and a frog 4 to be further described. The protector rod is usual- 1y carried by the laylnot shown) so that the rod and dagger reciprocate bodily toward and from the front of the loom, which is toward the right, Fig. 1. The dagger normally passes above an engaging piece 5 of the frog but, when protection is required the dagger engages such piece and thereby forcibly arrests movement of the lay.

The loom side is shaped to provide a frog support constituted by fiat surfaces 6 and 'l on which the frog can slide forwardly and rearwardly. The rearward limit of movement of the frog may be determined by a stop member 8 which is adjustably fixed to the loom side. Depending wings, as 9, on the frog depend on opposite sides of the loom side and thus guide the frog in its movements. One of these wings may be provided with a nose It adapted to engage and move a lever l I to stop the loom when the frog is moved forwardly.

A vertical thrust wall 12 underlies a portion of the frog and the latter is recessed rearwardly of the thrus wall to form, with the supporting surface 6 and the thrust wall, the conventional cavity l3. The cavity is substantially closed and is occupied by the cushioning member or block of the present invention.

In accordance with the invention, the cushioning member is comprised of separate sheets or layers each of which is positioned in a vertical plane extending widthwise of the loom, which is normal to the direction of movement of the frog. The alternate layers I4, I are formed of a resilient rubber material such as that of which frog cushioning blocks were formerly constructed. The remaining layers l5, [5 are formed of a relatively rigid material and I prefer to use leather for this purpose. An additional layer l6 may be added to make the member of proper length to fill the space between the thrust wall l2 and the end wall of the cavity.

Certain of the layers of the cushioning member are substantially co-extensive in width and height withthe cavity 13. Such layers engage the walls of the cavity and thereby prevent buckling of the member when compressed. I have ,shown the leather layers l5 as being soconstructed. Other 'layers are ofdesser' extent to thereby provide space for expansion of the rubber material. The

rubber layers M are shown as being of lesser width and height than the frog cavity. Thus, when bang-ofi occurs and the cushioning member com-' ,pressedthe rubber layers can expand both vertically and horizontally' without imparting any lateral bursting. stresses to ,the frog.

port, a thrust wall, afrog slidably mounted on Saidsupportand recessed to form withsaidsupobvious that the'invention is notlimitedtothe specific. construction shown onthe drawing.

Havingfully disclosed the preferred embodi- 25' merit of my invention, I claim:

In a loom protection mech nism,a frog support and wall a substantially closed cavity, and a cushionmember positioned in said cavity and substantiallyco-extensive in length therewith, said: member being comprised oi alternate layers- ;formedrespectively'of a resilient rubber material l anda relatively rigid material, each of said layers being positioned normal to the direction of movement of the frog and certain of said layers being V cor-extensive a width and height with saidcavity while other of said layers are of lesser extent to thereby provide spaces into which the rubber layers expand upon compression of the said member. 2. In a loom protection mechanism, a frog support, a thrust wall, a frog slidably' mounted on ;said support and recessed to form with said support and wall a substantially closed cavity,-and a cushion member" positioned in said cavity and substantially co-extensive in length therewith, said member being comprised ofalternate' layers" formed respectively of a resilient rubbermaterial and of leather, each of said layers being positioned normal to th'e direction of movement ofthe frog I and-certain offsaid layers being co-extensive in width and'height with said cavity while otherof' said layers areo'f lesser extent to thereby provide spacesinto which the rubber layers expand upon compressior of the said member.

3. In a'loom protection mechanism,- a frog supporta thrust wallga frog slidablymountedon saidssupport and recessed to form with said and substantially,Lcorextensive in length therea with, said'member being comprised of alternates layers formed; respectively. .of a resilient rubber; material and a relatively rigid material, each of.

saidrlayers being positioned normal to thedirection of movement of the frog, said rigid layers being ;coextensive in width and height-with said cavitywhilesaid rubber layers are of lesser extent to thereby providespacesinto which the rubber layers expand uponcompression of the saidmemberr .7

CARL D1 BROWN.

' supportxand wall a substantially closed cavity, I

and a cushion member positioned in said cavity

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