US2429055A

US2429055A - Slide fastener wear testing machine

Info

Publication number: US2429055A
Application number: US599407A
Authority: US
Inventors: John B Griffin
Original assignee: United States Rubber Co
Current assignee: Uniroyal Inc
Priority date: 1945-06-14
Filing date: 1945-06-14
Publication date: 1947-10-14
Anticipated expiration: 1964-10-14

Description

Oct. 14, 1947. J. B. GRIFFIN 2,429,055

v SLIDE FASTENER WEAR TESTING MACHINE Filed Jun 14, 1945 2 Sheets-Sheet 1 .ATI'UJTNEY Oct. 14, 1947. J. B.- GRIIFFIN 2,429,055

SLIDE FASTENER WEAR TESTING MACHINE Filed June 14, 1945 2 Sheets-Sheet 2 A T TOENEY Patented Oct. 14 1947 SLIDE FASTENER WEAR TESTING'MAGHINE John B. vGriffin, .Oakville, ,Conm, iassignor to United States Rubber Company, N w York,v

N. Y., a corporation of New Jersey Application June 14, 1945, ScrialNo. 599,407

(or. res-.7)

7 Claims.

This invention relates to a testing machine for testing the wearin r pe t es of a s dest ner when its slider is pu ed b k and r h in a curved pat alon a s inger.

It has been propos d heretofore. t test th wearinspron rties of a s de f stenerby m chanically moving th slider back and orth a straight line alon its stringer. iltf equeotly happens, h wever, that sl defasteners arereq ired to assume a c rved po i i n m se. and it is more difiicultxfor the slider t mo e back andxforthxalon a curved .strih er han along a straightone.

.It is therefore desira le. at least insomecases. to test the wearing prop rties of a slideiastene when the slider ,is required to travel alon a stringer that is forced to assume a ourvedposition. The pre ent inven i n therefore contemp ates a testin machine adapted tohold th strin er 'ofa slide fastener in a; ul extended condition were cu ve support while the slid r is chanically movedba k and for halon rthe curved stringer to test the wearing properties of the slide fastenerunderthese conditions.

One feature of the present invention resides in a curved s pport u on ic -the slide fastene to be t s ma be sec r d i 13 film/ex ded condition so that the fastener tapes of the strin ill be mainta ed in a stre ched con- .dition Whilethe slider ismoved back and forth along the stringer.

I Another feature resides in spaced yielding anchoringmeans attached to one end of each fastener tape and disposed a substantial distance apart so that these tapes will be pulled away from each other with a spreading action as they'are unlocked by the slider. I

In some cases it may be desirable to test-a slide fastener when the stringer is maintained in ,a curved position with the slider at the concaved side of the curved stringer, and in other cases it may be .desirable to test the slide fastener while the stringer is maintainedin a curved con- 2 Fig.2 isa side View of themachine shown in Fi 1.

Fig. 3 is a sectional View taking substantially on the line 33 of Fig. 2.

Fig. dis an enlarged sectional view of parts shown in Fig. 2.

Fig. 5 shows a clamp for securing one end of a --fastener tape to an anchoring spring.

Fig. 6 is a sectional view showing how the slot covering strip passes slidably onto the stringer supporting wall of the machine of Fig. 1 and;

Fig. 7 is a sid view showing a modification of the testing-machine.

Since the testing machine contemplated by the present invention is designed to test slide fasteners when the-slider thereof is pulled back and forth upon the stringer along a curved path, the present-machine is constructed to provide a curved support for the stringer. This support as shown is formed of sheet metal as indicated thisarcuate condition by securing its side edges to the curved surfaces of the side walls II and 25- lzso-that the upper edge portion of the sheet H! extends in a horizontal direction and the lower edgeportionextendsin a vertical direction as shown in Fig. 2. The sheet In is provided with the central slot 13 extending upwardly from its lower edge throughout the curved portion of this sheet. This slot is provided so that the pulltab of a slide fastener may extend therethrough to the inside ofthe curved support formed by the sheet I0, to be engaged by power operating means such as the rocking arm 14 that is rigidly secured to the actuating shaft l5. This shaft isdisposed concentrically to the are formed by the sheet I0 and is journaled in bearings l6 carried. by the side walls II and I2. To the outer end of the arm I4 is secured a .clamp comprising the fixed member Hand movable member l8 and adapted to be forced one towards the other by the U-shaped yoke I9 having a clamping screw vl9.

It is desirable to oscillate the shaft: so as to rock the arm 14 back and forth through an angle of approximately degrees. This is accomplished in the construction shown by securing to one end of the shaft l5 outside of the .side wall l2 the short arm 2 I. This side wall has rotatably mounted thereupon at some distance from the shaft l5 the stub shaft 22 on which is rotatably mounted the grooved pulley 23 adapted to be rotated by a belt not shown. When this pulley is ot t d it will impart roc in movement to the short arm 2| by means of the link 24, one end of which is pivotally secured to the outer end of the arm 2! and the other end is pivotally secured to the pulley 23 to one side of its central axis as at 25.

When a slide fastener is to be tested, such for example as a conventional slide fastener comprising the slider 26 adapted to slide along the fastener tapes 2? having the usual locking elements 28 and which tapes together form a stringer, one end of the slide fastener is clamped against the outer surface of the curved plate ill by the clamping bar 29, and to the other end of each tape 21 is secured a clamp 39 which is best shown in Fig. 5. Each clamp 30 is yieldingly secured to an anchoring post 3| by a coiled spring 32. This serves to pull the tapes apart with a spreading action as they are unlocked. The slide fastener is positioned as shown over the slot l3 so that the pull tab 33 of the slide fastener may extend inwardly through this slot and be gripped by the clamp by means best shown in Fig. 4.

It has been found in practice that the tension exerted upon the closed slide fastener by the springs 32 may tend to pull the slide fastener into the slot 13. This is prevented by providing the relatively long covering strip 34 which is provided near its upper end with a transverse slot through which the pull tab 33 may extend. The strip 34 is long enough to cover the entire slot l3 and extend downwardly into the base portion of the testing machine Where it enters the curved guiding sheath 35. The arrangement is such that as the arm I4 is oscillated by the power operating mechanism described so as to move the slider 26 back and forth along the tapes 2! the covering strip 3'3 will likewise slide back and forth over the surface of the plate [6 and back and forth in its sheath 35.

Since the purpose of the present machine is to test the wearing properties of a slide fastener by pulling the slider back and forth while the stringer is maintained in a curved position, it is desirable to provide counting means to show how many times the slider is actuated to open and close the slide fastener. Therefore the present machine is shown as having a counter 36 of well known construction secured to the inner face of the wall ll and adapted to be actuated by the connecting rod 31, the upper end of which is pivotally secured to a short arm 38 that is rigidly secured to the oscillating shaft l5.

The testing machine so far described is designed to test a slide fastener by moving the slider back and forth along the stringer when this slider is disposed at the inner face of the curved arc defined by the stringer. Should it be desirable to turn the slide fastener over so that the slider will be disposed at the outer convexed surface defined by the curved slide fastener, this may be done by employing the modified construction shown in Fig. 7 where the slide fastener being tested rests upon the curved metal sheet 39 which is supported by the side walls 40 substantially as shown in Fig. 1 except that the sheet 39 is not provided with a slot such as I3 of Fig. 1. The slide fastener in accordance with Fig. 7 is clamped in place upon the sheet 39 by the same type of clamping means shown in Fig. l but the slide fastener is secured in place so that the slider 26 is disposed at the outer curved surface of the stringer as shown in Fig. 7. This permits the pull tab 33 to be secured by the clamp 4! against one face of the oscillating bar 42, which bar has its opposite ends secured to the rocking arms 43, the inner ends of which arms are rigidly secured to the oscillating shaft l5 outside of the side walls H and I2. The arrangement is such that when the shaft I5 is oscillated as above described the bar 42 will be moved back and forth in an arc of a circle just outside of the outer curved surface of the supporting plate 39, to thereby move the slider back and forth along the curved stringer.

Having thus described my invention, what I claim and desire to protect by Letters Patent is:

1. A testing machine for testing the wearing 7 properties of a slide fastener having a slider that travels along a stringer formed of two fastener tapes; said machine comprising a curved support for the stringer, means for anchoring the opposite ends of the stringer so a to hold the slide fastener stretched over said curved support, and power actuated means for pulling the slider back and forth in a curved path to lock and unlock said tapes.

2. A testing machine for testing a slide fastener having a slider that travels along a stringer formed of two fastener tapes; said machine comprising a curved support for the stringer, means for anchoring one end of the stringer, widely spaced yielding anchoring means adapted to be secured to the tapes so as to hold the slide fastener stretched over said curved support and to spread the tapes apart as the slider is moved towards the open position, and power actuated means for pulling the slider back and forth in a curved path to lock and unlock said tapes.

3. A testing machine for testing a slide fastener having a slider that travels along a stringer; said machine comprising a curved slotted support for the stringer, means for anchoring the opposite ends of the stringer so as to hold the slide fastener stretched over the slotted portion of the curved support, and power actuated means connected to the slider through said slot and operable to move the slider back and forth in a curved path along the stringer.

4. A testing machine for testing a slide fastener having a slider that travels along a stringer; said machine comprising a curved slotted support for the stringer, means for anchoring the opposite ends of the stringer so as to hold the slide fastener stretched over the slotted portion of the curved support and power actuated means connected to the slider through said slot and operable to move the slider back and forth in a curved path along the stringer, and a sliding slot cover positioned between the curved support and stringer.

5.'A testing machine for testing a slide fastener having a slider that travels along a stringer; said machine comprising a curved support for the stringer, means for anchoring the opposite ends f e er so as to 1101a the slide fastener stretched over this curved support, and power actuated means located at the concave side of the curved support and operable to move the slider back and forth in a curved path along the stringer.

6. A testing machine for testing the wearing properties of a slide fastener having a slider that travels along a stringer and a pull tab attached 'thereto, said machine comprising a curved supoperable to pull the slider back and forth along the curved path of the stringer.

'7. A testing machine for testing the wearing properties of a slide fastener having a slider that travels along a stringer and a pull tab attached thereto; said machine comprising a curved supported for the stringer, means for anchoring the opposite ends of the stringer so as to hold the slide fastener stretched over said curved support, and a power actuated member disposed in spaced relation to said support so that the slide fastener lies therebetween and is connected to said tab to pull the slider back and. forth along the stringer.

JOHN B. GRIFFIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,087,295 Jaros et al. Feb. 17, 1914 1,629,858 Browning May 24, 1927 2,079,591 Bartell May 11, 1937 2,113,290 Benjamin Apr. 5, 1938