US2675606A

US2675606A - Method of assembling pull tabs to sliders

Info

Publication number: US2675606A
Application number: US259361A
Authority: US
Inventors: Birdsall P Lawson
Original assignee: PILLING CHAIN Co
Current assignee: PILLING CHAIN Co
Priority date: 1951-12-01
Filing date: 1951-12-01
Publication date: 1954-04-20
Anticipated expiration: 1971-04-20
Also published as: GB723289A; ES206542A1; US2723447A; DE1116183B

Description

April 20, 1954 B. P. LAWSON METHOD OF ASSEMBLING PULL TABS TO SLIDERS Filed Dec. 1 1951 Patented Apr. 20, 1954 METHOD OF ASSEMBLING PULL TABS TO SLIDERS Birdsall P. Lawson, Providence, R. 1., assignor to Pilling Chain Company, Providence, R. I., a corporation of Rhode Island Application December 1, 1951, Serial No. 259,361

2 Claims.

This invention relates to a novel method of assembling a pull tab to a separable fastener slider of the reversible type.

In the so-called reversible type of slider for separable fasteners, such as shown and described, for example, in U. S. Patent No. 2,495,176, the guide members or wings are interconnected at one end by a pivot so that they may be swung apart to completely disengage the slider hooks or elements and be re-engaged therewith in a relatively reversed position. Normally, the guide members are held in substantially parallel relation by means cooperable with the pull tab of the slider, such means usually comprising aligned apertures in interengaged male and female ears on the two members receiving separable stub shafts or pins on the pull tab. When the pull tab is forced toward a given position, cooperating cam means spread the tabv pins sufliciently to release the male car so that the guide members may be swung apart.

The hinging connection between the guide members is provided by forming a male ear projecting from one member and engageable between spaced female ears on the other member. The three ears are formed with holes which are aligned, when the members are properly assembled, to receive a fastening pin which may then be headed to prevent displacement.

The pull tab for such sliders comprises a sub stantially fiat U-shaped metal piece having short pins, fingers or stub shafts on the outer ends of its arms extending toward each other in alignment. An upwardly projecting apertured ear on the lower wing extends between two similar female ears on the upper member, and the tab is assembled to the slider by spreading the tab arms so that the pins are spaced the thickness of the three ears and can snap into the aligned aperture. When the tabis forced toward one extreme position, abutments on the inner edges of its arms engage a cam surface which spreads the arms sufficiently that the pins disengage the central or male car while remaining engaged in each female car. This allows the wings to be swung out of parallelism to disengage the fastener elements so that the slider can be removed and reversed in re-assembly on the fastener.

The amount of spreading of the tab arms required in assembling the tab with the fastener by slipping the open tab end over all three ears is detrimental to the desired springiness of the tab and may result in malfunctioning or disengagement of the tab. In accordance with the present invention, this is avoided by a novel 2 structural change in the slider and a novel assembly method.

For an understanding of the invention method, reference is made to the following description of a typical application thereof as illustrated in the accompanying drawing. In the drawing:

Fig. 1 is a side elevation View of a slider embodying the invention;

Fig. 2 is a plan view thereof;

Fig. 3 is a side elevation view of the invention slider in the fastener release position;

Fig. 4 is a plan view corresponding to Fig. 3; and Fig. 5 is a plan view of the pull tab.

' Referring to Figs. 1 through 5 of the drawings, a reversible slider is illustrated as including a male member or wing I and a female member or wing 20. Member Hi includes a fiat wall H partially bounded by flanges l2 to form a Y- shaped channel for passage of the separable fastener elements through the slider. A 'substantially triangular abutment l3 projects from wall ll adjacent the diverging end of the member, abutment l3 having a flat surface M for a purpose to be described. An ear projects rear wardly and outwardly from abutment I 3, having a rearwardly disposed aperture and an outwardly disposed aperture H. The outer edge of ear I5 is tapered, as at ill, for a purpose to be described.

Female member 20 is similar in outline to male member l0, having a flat wall 2| partially bounded by flanges 22 and a fiat surface 24 arranged to engage surface M to maintain members I0 and 20 normally in parallelism with flanges l2 and 22 in substantially parallel spaced relation. A pair of laterally spaced ears 25 project vertically in opposing directions from wall 2|, the respective opposing portions thereof being indicated at 25a and 2%, the inner walls of ears 25 being spaced sufficient to receive ear I 5 therebetween. The ear portions 25a have parallel walls while ear portions 25b have inner walls in alignment with those of the ear portions 25a, while the outer walls thereof are inclined to form cam surfaces 23, for a purpose to be later described. Just forwardly of ear portions 25b, wall 2! has outwardly projecting laterally spaced ears 23 each having a U-shaped recess 26 therein alignable with aperture l 7 when the members I!) and 20 are assembled.

When the two members are assembled in parallelism, with ear I5 engaged between the inner faces or walls of ear portions 25a and 25b of ears 25 and with the surface it engaging surface l4,

the flanges l2 and 22 are spaced to pass the stringers of a separable fastener. As will be understood by those skilled in the art, the teeth of a closed fastener are disengaged as they pass from trunk passage 31 into

branch passages

32, 32 to either side of abutment l3, and are re-engaged by passing from *branch passages '32 "into trunk passage 3|.

Wings iii and 2!} are hinged together by a pin extending through ears l5 and portions a bf ears 25. Alternatively, this connection may be formed as shown, described and claimed inmy copending application Serial No. 359,362, filedDecember l, 1951, for Pivotal Connections for Hinged Members of Sliders-or the Like? 7 The pull tab for the slider is shown at hand in detail in Fig. 5, as being a substantially flat, springy metal member, generally V-shapein plan, which latter shape provides for the utilization of a maximum bending moment without deformation-upon development of stress thereon. Tab '40 has a bight 4i and diverging arms 42, :42. Each arm has an abutment 43"911 its inner edge-near its free end. The free end of each arm has a short stub shaft or pin 44 extending at rig-ht angles thereto, these pins beingin alignment and slightly spaced from each other.

In accordance with the present invention, tab 49 is assembled with the slider in the following manner. The

arms

42,42 are spread just-sufficiently to engage the

taperedsurfaces

18,18 of ear +5. The fingers 44 arethen forcedinw-ardly over surfaces I3, 58 being spread further apart thereby, and into slots-or recess 26. The fingers then snap into aperture 4'1. To complete the assembly, the projectiQns ZQ-bounding recesses 26 are then bent around pins 44 as shown in broken lines in Fig. l and in full lines in -Figs. 2, 3 and 4. Thus, by virtue of the specific v-conformationof the tab it and itsaferesaid utilization of 'its maximum bending-moment without deformation under stress, the arms 42 thereof need be spread only one-third the amount normally required, reducing the assembly stress on the pull tab.

When tab 48 is assembled to the. slider, the surface 24 is held against surface '14 to maintain wings Hi and 29 in parallelism. To release the slider from afastener, tab 40 is forced rearwardly to theposition of Figs. 3 and 4. Abutments 43 engage sloping cam surfaces 28 on ears 25b to spread arms 42. Pins Mare thus released "from aperture H while being held by bent-over projections 29 of ears 23. Wing 20 thus swings about the pivotal connection between ear l5 and ears 2554, under the pressure on" tab 40, so that the slides may be disengaged from the fastener and reversed, if desired. The inner ends of pins 44 ride on ear l5, and readily snapba'ckint'o aperture I! when tab 40 is swung toth'e opposite position and pressed inwardly.

While a specific embodiment of the invention has been shown and described in detail to illustrate the application of the invention principles thereof, it should be understood that the invention may be otherwise embodied without departing from such principles.

What is claimed is:

l. The method of assembling a-pull tab to a separable fastener slide of the type having a pair of guide wings hingedly interrelated at one end, an abutment extending from the inner surface of one wing "and having a flat surface parallel to "such inner surface and engageable with the inner surface of theoth'e'r wing to space the Wings in parallel relation, an apertured ear extending from such abutment, and a pair of spaced ears extending outwardly from said other wing and receiving said 'apertured ear therebetween, the pull tab being "V-shape and having pins on the free ends of its arms extendingfnormaliy thereto toward each-other such method comprising forming outwardly opening recesses in the spacedears aligned with the aperture in .suchapertured ear; spreading the tab arms until the pins slip over such apertured car into the recesses and into such aperture; and crimping the free edges of the recesses o'ver thepins.

2. The method of assembling a pull tab 'to a separable fastener slide of the type having a,'pair of guide wings .hinge'dly interrelated at one end, an abutment extending from the inner-surface of one wing and having a flat surface parallel to such inner surface and engageable with the inner surface of the other wing to space the wings in parallel'relation, an apertured ear extending from "such abutment, and a pair of spaced ears extending outwardly from said other wing and receiving said apertured ear therebetween, the pull .tab being V-shape and having pins on the free ends of its arms extending normally thereto toward each other; such method comprising forming'outwardly opening recesses in the spaced ears aligned with the aperture in such apertured'ear; forming a'tapered surface on the outer edge of sudhaprtured ear; spreading the tab arms until the ins slip over such apertured ear into the recesses and'into such aperture,'by forcing the pins over such tapered surface; and crimping the free edges of the recesses over the pins.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,162,266 Marinsky r- June 13,1939 2,205,694 Morin June25, 1-940 2,397,693 Rabinow Ap1';"2,- l946 2,495,176 Nissen r l i v Jan. 17, 1950 2,526,653 Gerstman Oct. 24:, 1950