US2084759A - Paper tacking strip - Google Patents

Description

June 22, 1937. l.. F. BARNUM PAPER TACKING STRIP Filed sept. 27, 1955 INV ENT OR.

ATTORNEYS Patented June 22, 1937 EMME@ S'E'E ETEN'E' QFMQE 6 Claims.

Ihis invention relates toa tacking strip formed of paper and constitutes an improvement on the tacking strip disclosed in my prior Patent No. 1,912,121, of which inspection is invited.

Tacking strips of fibrous material are used quite extensively in the manufacture of automobiles having steel bodies, the strips being secured in the bodies to.y provide means whereby tacks may be used for attaching upholstery 10 thereto. The body parts are provided with channel members, with grooves, recesses and the like, into which the tacking member is secured by prongs or the like.

Originally tacking strips were formed by spil5-ra11y twisting paper ribbons to provide a paper rope and the rope was subsequently pressed into a shape whereby it fitted into the recesses or grooves in the automobile body. Difficulty was experienced with this type of strip because of its natural tendency to unwind, which caused it to assume a corkscrew shape. By making the tacking strip of oppositely twisted strands, as claimed in the above referred to patent, the difficulty experienced in connection with the original tacking strip was avoided. However, in the forming of automobile bodies by present day methods there are certain conditions wherein my patented strip cannot be used without difculty. For example, in some automobile bodies the tacking strip is placed in parts. of the bodies prior to Welding, and in other cases after the welding operation and prior to grinding away the ash. In these instances the strip is sometimes nicked by the grinding wheel, and when the patented 3'5 strip is nicked, particularly when it is in a groove which is not straight as for example, a groove around a window opening in a body, it frequently happens that one or more of the twisted strands are completely severed. The severing of a strand,

While the strand is under tension through bending of the strip, results in a tendency for the strand which is severed to unwind to such an extent that the two ends thereof project outwardly beyond the surface of the groove edges.

For this reason it is not acceptable to the automotive industry under these particular conditions because it requires an additional operation of removing the projecting ends.

The primary object of the present invention is to provide a tacking strip suitable for use under the lconditions recited and this is accomplished by forming the strip of oppositely twisted strands, the outside Winding being formed of ribbons which are hat, unwrinkled, and which adhere to the inside winding. The outside winding thus constitutes a casing for the inside winding and because the outside winding is smooth and ilat each strand thereof is of greater width than the inner strands, Whereas in my prior patent all the strands were approximately the same size. The particular formation of the outside winding eliminates the possibility of one of these strands being completely severed by a nick as above described. This invention therefore provides a sheath or casing secured around the spirally twisted core by an adhesive so that it may be abruptly bent without spreading or parting of the strands and this sheath or casing functions to prevent the natural tendency of the core winding to partially unwind and cause the strip to assume a corkscrew shape.

It has been found that moisture in the atmosphere affects the tacking strip and sometimes causes it to swell to such an extent that present day methods of assembly require that the strip be Waterproofed. To waterproof the strip the paper is impregnated with asphalt, which is the only commercially practical material known at present. However, asphalt acts as a lubricant and when the tacks are driven into the strip they do not hold as eciently as when the strip is not waterproofed. This invention has as another object to provide a tacking strip which is waterproofed and which includes means for efciently holding the tacks.

In order to provide a waterproofed strip which will efficiently hold tacks the present invention provides a core for the strip which is formed of paper previously treated so that it will not absorb liquid asphalt readily. The spiral ribbons and the spirally formed sheath are both treated with asphalt prior to the twisting operations and the core which does not absorb asphalt provides eicient means for holding the tacks because it lacks the asphalt which acts in the nature of a lubricant. Due to the fact that the core paper is previously treated so that it will not absorb asphalt, the asphalt from the spirally twisted ribbons does not penetrate the same when the rope is pressed into strip form by the pressing rolls. The core paper is of a hard iiber type commercially known as kraft paper.

With the above and other ends in View the invention consists in matters hereinafter more particularly pointed out with reference to the accompanying drawing, in which Figure 1 is a vertical section of a machine for' forming the present strip, and

Fig. 2 is a diagrammatic view of the strip.

In the drawing the numerals l and 2 designate disks which are secured together by removable bolts 3 having sleeves Il thereon. I'he disk I has a hollow spindle 5 rotatably received in a bearing 6 on a frame member l. The disk 2 has a hollow spindle 3 rotatably received in a bearing 9 on a frame member Ill. bolts 3 and sleeves 6l constitute a rotatable support for a plurality of rolls II of paper.

A pair of disks I2 and I3 are secured together by elements I, preferably formed the same as the bolts 3 and sleeves li. The disk I2 has a comparatively large hollow spindle I5 rotatably received in a bearing I5 on a frame member I'I. 'Ihe disk I3 has a spindle I8 rotatably received in a bearing I9 on a frame memberZ. The disks I2 and I 3 and the elements IG, constitute a rotatable support for a plurality of rolls 2i of paper. In addition, in this latter rotatable supe. port, are provided guide elements 22 which are angularly positioned with respect to the axes of the support and the rolls 2gI of paper. The function ofthe guides 22 will become apparent as the description progresses.

spaced outwardly from the end of the spindle 8 is a pair of pressing rolls 23 and 2li, the roll 24 having a groove 25 into which the roll 23 eX- tends. Spaced outwardly of the end of the spindle I8` is a similar pair of rolls, respectively designated 25 and 2l. The disk 2l has a circumferential groove 28 into which the roll 26 extends. Spaced outwardly from the end of the spindle 5 is a frame 2S supporting a shaft 35 upon which is received a roll 3l of paper.

A drive shaft 32 is rotatably supported by frame members and is adapted to be driven by a suitable motor (not shown). On the shaft 32 is provided a sprocket 33 which is connected by a chain 34 to a sprocket 35 on the spindle 8. A bevelled gear v35 is mounted on the shaft 32 and meshes with a similar gear 3l. on a vertical shaft 38. On the upper end of the vertical shaft A38 is a gear 39 meshing with a gear fi@ which is secured to the pressing roll 2li. A gear lli. is mounted on the shaft 32 and meshes with a gear i2 on a. shaft 43 supported by the frame 25. On the other end of the shaft 153 is a sprocket 4.4 which is connected by a chain 45 to a sprocket l5 secured on the spindle IB. A bevel gear @l on theshaft 32 meshes with a similar gear 43 on a vertical shaft 49 having a gear 5I) meshing with a gear 5I which is secured tothe pressing roll 27.

Extending through the. spindle I5 is a spray nozzle 62 having a supply line 63 with a control valve 64. therein. The spray devicev is for handling liquid adhesive in a manner and for a pur-,- pose to be presently described, the reservoir for containing the liquid adhesive and the means for forcing it to the spray gun not being shown here because such means are already well known in the art and they form no novel part of the.

invention here presented.

In operation a ribbon 52 from the roll Slis extended through the spindle 5. and is drawn through the spindle 8, along with ribbons 53 from the rolls II, by the rotatable rolling elements 23 and 24 When the power shaft 32 is rotated by a suitable motor. At the same time these ribbons are drawnthrough the spindle the .disks I and 2 are rotating, with the result that the ribbon 52 is crushed into a compact mass by the.

The disks I and 2 and the 23 and 24 it is compressed into a compact strip 55. The strip 55 extends through the spindles I5 and I8 and is engaged by rolling elements 25 and 2l which function to propel the strip length` wise. Between the disks I2 and I3, ribbons 55 from the paper rolls,2l are wound around the strip 55 by the rotating action of the disks I2 and I3.

It will be noted that the sprocket 35 on the disk 2 is directly connected to the sprocket 33 on the drive shaft 52 whereas the sprocket de is connected to the drive shaft 32 through the sprocket lit, shaft 53 and gears t2 and lli, with the resultV onto the inside surface of the ribbons and onto the outside surface of the strip` 55, The` pressing rollers 25 and 2lv press'thev ribbons 55-into rm,

contact with the strip 5.5150 insure adhesion.

Prior to treating the paper ribbons in the above described manner the paper of roll 3l is treated whereby it does not readily absorb asphalt. A hard surfaced, hard nbre paper, commercially known as kraft paper has been found satisfactory for this purpose. The paper of rolls II and 2l are impregnated with asphalt, .preferably by runningrthe ribbons through a bath of As- `phalt rendered' liquid by solvents is satisfactory asphalt which is held in solution by heat.

but has the disadvantage of requiring considerable'timeV for the solvents to` evaporate.

Due to the fact that the ribbons 5,6 are Vsecured by an adhesive to the strip 55V they may be punctured, as pointed out i'n the preamble,

Without the ends formed by the puncture tending toseparate from the strip. The ribbons 56 are wide as compared with the windingsV of the ribbons 53 as may be readily seen upon reference to Fig. 2 wherein the progressive winding action is illustrated diagrammatically.

In cases where waterproofing is not essential the corejof hard nbre paper permits the remainder of the strip to be formed of; soft fibre paper by counteracting the inefficiency of'a soft bre strip as meansfor holding tacks.

Although a specific embodiment of the invention has been illustrated and described it will be understoodY that various changes may be made inthe details ofconstruction without departing fromV the spirit of the invention as defined by the appended claims and such changes are contemplated.

What I claim is:-

1. The method: 0f forming amper. backing.

strip which consists in spirally- Wrappns paper ribbons about a paper strip, compressing the for.

65 str1p and forming the same into aureed, and

mationk provided by the wrapped ribbons and spirally Wrapping paper ribbons iat aboutth reed.

2, The method of forming a paper tasking` strip which consists in crushing a paper coreby winding paper ribbons spirally thereabout, compressing the formation provided by said core and ribloonsI into a reed, and spirally w'rappingpaper ribbons flat about saidreed.

3. Themethod of. forming apapertackingstrip which consists in spirally Wrapping paper ribbons about a paper strip, compressing the formation provided by the Wrapped ribbons and strip and forming the same into a reed, and spirally Wrapping a plurality of ribbons about-the reed while maintaining the ribbons flat and in overlapped relation.

4. The method of forming a paper taoking strip Which consists in crushing a paper core by winding paper ribbons spirally thereabout, compressing the formation provided by said core and ribbons into a reed, and spirally Wrapping a plurality of ribbons about the reed while maintaining the ribbons at and in overlapped relation.

5. The method of forming a paper tacking strip which consists in spirally Wrapping paper ribbons about a paper strip, compressing the formation provided by the wrapped ribbons and strip and forming the same into a reed, spirally Wrapping paper ribbons fiat about the reed, and placing adhesive on the inside surfaces of the fiat wound ribbons While they are being wound about the reed.

6. The method of forming a paper tacking strip Which consists in crushing a paper core by Winding paper ribbons spirally thereabout, compressing the formation provided by said core and ribbons into a reed, spirally Wrapping paper ribbons fiat about said reed, and placing adhesive on the inside surfaces of the at Wound ribbons While they are being wound about the reed.

LESLIE F. BARNUM.

Images