US2421599A - Loom dobby - Google Patents

Description

June 3, 1947. 1 CASH, JR 2,421,599

LOOM DOBBY Filed Sept. 26, 1945 2 Sheets-Sheet l Y 3 Inventor Joseph 2. Cash J7.

June 3, 1947. J. D. CASH, JR

LOOM DOBBY Filed Sept. 26, 1945 2 Sheets-Sheet 2 Inventor Jasep/ D; (as/z, Jr:

M M Q Patented June 3, 1947 UNITED STATES PATENT OFFICE LOOM DOBBY Joseph D. Cash, Jr., Cramerton, N. 0. Application September 26, 1945, Serial No. 618,630

5 Claims.

This inventionrelates to loom dobbies and has more particular reference to the provision of wear-resisting bearings for the hook levers and hooks of such dobbies.

Large numbers of hook levers are used in each loom dobby, and they are extremely limited in thickness and are usually constructed of strips of relatively cheap and soft sheet metal having comparatively small resistance to wear. Accordingly, as the levers are subjected to often repeated, heavy strains,they rapidly wear at their pivots and at the pivots for the hooks. This results in loose pivots that cause faulty operation of the loom and require frequent replacement of the hook levers. I

The primary object of the present invention, therefore, is to provide the dobby levers with wear-resisting bearings of practical construction so that frequent replacement of the levers will be unnecessary even though said levers are mainly constructed of strips of relatively cheap and soft sheet metal.

The exact nature of the present invention, as well as other objects and features thereof, will become apparent from the following description when considered in connection with the accompanying drawings, in which:

Figure 1 is a side elevation of certain parts of a loom harness mechanism embodying the present invention, I

Figure 2 is an edge elevational view looking toward the right of Figure 1,

Figure 3 is an enlarged fragmentary vertical section taken on the line 3-3 of Figure l, Figure 4 is a view similar to Figure 3 taken on the line 4-4 of Figure 1, s Figure 5 is a fragmentary developed perspective view showing the jack or harness lever, the hook lever, and theparts of the bearing for the hook lever in process of assembly,

Figure 6 is an enlargedfragmentarysection taken on line 6-6 of Figure 1,

Figure '7 is a section taken on line l'I of Figure 6,

Figure 8 is a fragmentary elevation illustrating V a modification of the pivot boss or stud for the jack or harness lever,

Figure 9 is a view similar to Figure 8 of a further modification,

Figure 10 is a section taken on line Ill--I of Figure 1, and

Figure 11 is a, side view of one of the bearing rings for the pivot bosses of the hooks.

Referring in detail to the drawings, indicates a jack or harness lever having an integral boss or stud 6 on which the hook lever I is centrally pivoted, and 8 and 9 indicate theupperand lower hooks which are pivoted to the ends of the hook lever I. As usual, the lever I is mainly constructed of two similar strips of sheet metal .Ill and Il suitably secured together as by rivets I2. To minimize cost, the sheet metal of which the parts Ill and, II are formed is relatively soft material possessing comparatively little resistance to wear. These parts are formed in the shape shown in Figure 3 with the offset end portion l3 of parts Ill and II atopposite ends of the same and with lateral lugs or projections I4 on the straight ends of said parts or strips I0 and I I. The strips are then placed face to face with their intermediate portions in en agement, whereupon the parts are secured together by therivets I2, the lug I4 .of each strip contacting the adjacent end of the other strip so as to keep the ends of the strips I0 and II in properly spaced relation.

As shown, the pivot boss or stud 6 of lever 5 is of non-circular form in cross section and has at least one flat side I5. Fitted on the stud 6, by a, snug or press fit, is an inner bearing sleeve I6 of cylindrical external form and provided with a central bore l'I substantially conforming in size and shape to the stud 6. The stud 6 and sleeve I6 are of similar length. The strips Ill and II have registered central pivot openings I8 of, larger size than the stud 6 and sleeve I6, and tightly fitted in these openings with a'press fit is an outer bearing thimble I9 having a cylindrical wall received in the openings I8, an outer end wall 20, and an external annular flange 2| on the inner end thereof. The sleeve I6 has a snu rotating fit in the thimble I9, and the flange 2| engages the face of strip Ill adjacent the lever 5, being preferably countersunk in said face as shown so as to permit the strip II] of the lever l to lie in contact with the adjacent face of lever 5. The flange Zlprevents displacement of the thimble I9 from the openings I8, and the wall 20 of the thimble I9 acts as a lubricant retainer when the lubricant is introduced between the parts I6 and I9 in process of assembly. The end wall 20 is preferably of slightly convex form so as to leave a slight space between the same and the outer ends of the parts 6 and I6 to act as a lubricant reservoir. Due to the form of the stud 6 and the bore I1, the bearing sleeve I6 is positively retained against turning, and the outer surface of the cylindrical wall of thimble l9 may be roughened so as to bite into the material of the strips I0 and II and thereby insure against turning of the thimble I9 relative to the lever l.

A tight press fit of thimble [9 in openings l8 may, however, be found sufiicient. In this way, a very practical and elficient wear-resisting bearing may be provided for the lever 1 even though the same is made of comparatively thin sheet metal strips of relatively soft quality, only the parts l6 and I9 being made of relatively hard, wear-resisting bearing material.

As usual, the hooks 8 and 9 are preferably provided with integral pivot bosses 22 at each side thereof which are ordinarily received in openings 23 in the ends of the lever strips and II, the pivoted end of each hook being freely movable between the ends of the strips I0 and. I I which are sufficiently separated for this purpose by the lugs [4. However, in accordance with the present invention, the openings 23 are made somewhat larger than the bosses 22, and a bearing-ring 24 is tightly fitted in each opening 23 with a press fit. Each bearing ring 24 has a central opening 25"which is of a size so that a boss 22 hasv a snu pivotal fit therein. Obviously, the bosses 22and bearingring 24: maybe formed of relatively hard, wear-resisting metal. so as ,to insure long continued' operation without wearing of the parts at the pivots for thehooks' 8 and 9. If found necessary or desirable, the'bearing rings 25 may be provided with. transverse peripheral V-shaped ribs 26 whichare comparatively fine and sharp and are, therefore, adapted to bite into the materijal' of the strips l0 and II surrounding the openings. 23 when said 'bearing rings 24 are pressed into place. This. insure more positive retention of. the. bearing rings in place. and prevention of. the same. fromrotating relative to the strips. L0. and. H or withthe bosse 22; Practical bearings. are thus provided for the. hooks 8 and 9 even. though they. are of limited Width corresponding to. that of the thickness of strips l0 and Eventhough. the hooks 8 andil and lever 1 are subjected. to. repeated strains, the bearings provided as describedabove effectively resist wear and eliminatethe necessity for frequentreplacement of the lever 7.

Intheembodiment of Figures 1 to, 7, inclusive, the. stud 6. is of general cylindrical form with one fiat side [5,. butit will be apparent that rotation of bearing sleeve 16 may be. prevented in other equivalent ways, such as by providing thestud 6a. of rectangular form, as in Figure 8; or of hexagonalform, as shown at EbinFigureS. In all cases, the stud is of non-circular for in: cross section and isradapted, to: be used with a bearing sleeve having a bore of similar form. From the foregoing description, it is believed that the. construction, operation and advantages of the present invention will be readily understoodandappreciated by those skilled in the arts. Minor .-ehanges may be made in detail-s of construction illustrated and described, such asfall within the scope ofthe-i-nvention as claimed.

What I claim is:

1. In a loom dobby, in combination, a jack lever having a pivot stud of non-circular cross section for a hook lever, an inner bearing sleeve having a bore corresponding in shape to that of the pivot stud and fitted onto the latter, a hook lever embodying two sheet metal strips secured together and provided with central registered openings, and an outer bearing thimble having a snug rotating fit on said bearing sleeve and press fitted into said registered openings of the strips of the hook lever, said bearing thimble having a wall closing the outer end thereof and provided with. an external flange at its inner end engaging the face of the strip adjacent the jack lever in surrounding relation to its opening.

2. The construction set forth in claim 1, wherein said. flange of the bearing thimble is countersunk in the adjacent face of the adjacent strip.

3. The construction defined in claim 1, wherein the end wall of the bearing thimble is of convex form and spaced from the adjacent ends of the pivot stud and inner bearing-sleeve to provide a lubricant reservoir. 7

4. In a loom dobby, a jack lever having-a pivot stud for a hook lever, a bearing sleevehaving a press fit onsaid stud, a hook lever including two strips of sheet metal secured together and provided with registered, central openings, and an outer bearing thimble having a press fit in said registered openings and" a snug rotating fit on said inner bearing sleeve, said bearing thimble having a wall closing the outer endthereof and andbeing provided, at its inner end, with an external flange engaging the face of one of said strips adjacent the jack lever to prevent displacement of the thimble from said registered openmgs. I 5. The construction defined in claim 4, in combination with means to positively prevent relative rotation of the inner bearing sleeve relative to the pivot stud of the jack lever.

JOSEPH D. CASH, JR.

REEEEENGES' CITED The fo'llowing'references are of record in the file of this patent:

' UNITE-D STATES PATENTS Number Name Date .2-,370;762 Weisbecker Mar; 6,1945 729,627 Meats June 2,- 1903 1,369,700 Nee'dham Feb. 22, 1921 1,568,943 Amsd-en Jan, 5, 1926 1366;744 Gordon June-24,,1930 2,054,585 Holmes Sept; 15, 1936 1,233,127 Ross .1 July 10, 1 917 1,811,209 Newton June 23, 1931 FOREIGN PATENTS:

Number Country Date 9,809 Great Britain 1892

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