US1738561A - Extension device - Google Patents

Description

' Dec. l0, 1929. E, G. CARL ON 1,738,561..

EXTENS ION DEVICE Filed June 15. 1928 IN VEN TOR.

. ATTORNEYS.

Patented Dec 10, 1929 EDWIN G. GARLSON, or nIvEnsIDII, nnom: ISLAND, ASSIGNOR T PE DEL CHAIN 00., on rnovrnnnon, anozon ISLAND, A FIRM comrosnn or FREDERIC SIEIDEL AND EUGEN SPEIDEL EXTENSION DEVICE Application filed June 15, 1928, Serial No. 285,750.

vice for use more particularly with a wrist Watch strap; and has for its object to provide a plurality of hingedly connected sections which may be unfolded to extend the efiective' length of the strap with stud and recess means between two of the sections to hold them in folded position. 7 A further object of the invention is the provision of an opening in one of the sections with a stud on another of thesections to extend through the opening and frictionally engage an edge thereof with each of the engaging parts tendingpto move the part engaged in a longitudinal direction to retain the sections in folded position. I

This invention further consists in the provision of a resiliently sliding part in one of the sections to which one end of the strap is connected, whereby elastic action is provided either when the device is in folded or contracted position on the wrist or when the device is unfolded to permit a still further extension of the strap to be passed over the hand in removing the strap and its wrist Watch from the wrist.

With these and other objects in view, the invention consists of certain novel features of construction, as will be more fully described, and particularly pointed out in the appended claims.

In the accompanying drawings:

Figure 1 is a top plan view of the extension device in contracted or folded position showing the parts of the wrist watch strap attached thereto. 7

Figure 2 is a top plan view of the sections of the device in unfolded position with portions broken away to show the construction bywhich an elastic action is obtained.

Figure 3 is a side view in central section ofthe device extended as illustrated in Figure 2. V

Figure 4 is a sectional side view of two of the sections with the spur on one of the sections extending through the opening in another vof the sections.

Figure 5 is a perspective view of the sliding partattaehed to one endof the strap.

Figure 6 is a section on line 6-6 of Fig-' ure 2.

F igure7 is a section on line 7-7 of Figure 2 showing the hinge mounting of one plate section in theside walls of the channel section. p

Figure 8 is a section on line 8 -8 of Figure 2 showing the resilient pin forconnecting one end of the strap to the end of thesection'.

Figure 9 is a section on line 99 of Figure 2 through the spur.

Figure 10 is a side elevation of the device in folded position.

7 Inthe use of unfoldable devices for temporarily extending the length of a wrist watch strap for removing the strap and watch from the-wrist by passing thesame overthe hand of the wearer, it isoften desir able to provide some elasticity of the strap so as not to bind the wrist as it is enlarged due to the use of the muscles of-the hand and arm, which I have accomplished by slidably mounting a part to which the strap is connected in one of the sections with yielding means between the part and the section tending to house the part and movethe strap to contracted position, and in this construction I have provided a stud on one of the sections so formed as to require a longitudinal resilofthe strap parts, each of. which is provided with a suitable end member 12 for connection to a wrist watch. The opposite ends of the strap parts are connected to an extension de-' vice 13 which may be unfolded as illustrated inFigure 2, to temporarily extend the effective length of the strap for passing the strap reference to the drawings, 10 desigwith a watch attached over the hand of the wearer without separation of any of the parts.

This extension device has a body section 14 generally channelshape in cross section with a top wall 15 and side walls 16 between which at one end thereof a cross bar 17 extends. A U-shaped slide 18 is mounted with its arms on each side of the cross bar 17 with a spring 1 19 actingbetween the bridge portion 20 there of and the bar 17 to move the slide into housed or contracted position, as illustrated; in F ig; ure 3. The end of the strap part 11 is suitably fastened between the free ends 21 and 22.

15 of the arms of the U slide by means of fingers 23' binding'the ends thereto:

The two plate sections 24 and 27are hinged together and hinged to the channel' s'e'ction. The intermediate plate section 24 has-outm wardly extending trunnion portions 25'pivot:

ally mounted in the openings 26 in the chan nel walls while a pin and eye oint-28 pivotal- 7 1y connectsth'e two plate sections together whereby both plates may b'e'swung and fold;

ed one against the other and be swung] to be partially housed in the channel sec'tion14, Sections 14, 24mm 27 are-held in folded position by means of a stud of spur 29' on section'27 extending through an opening 30. 'in'section 24 and frictionally engaging'fihe marginal end and edge of the. opening which is'remo'te from the hinge connection of the sections 24 and 27 The spur is formed from the sheet stock of the section and lies in a "plane generally longitudinahofthe section as distinguished from a transverse direction so that its greatest resistance to bending is in this-plane. The spur 29 is formed by cutting spaced portions of the section 27 and folding together the two parts 31 and 32 each having an'overhanging'portion 33 on its edge distal or remote from the hinge connection forming an undercut portlon 34 into which the marginal edge 35 of'the opening 30'ex-I o tends to hold the sections in close engagement by a longitudinal" resilient action, This spur 29' alsoserves' as a guide forthe side edges of theopening 30 to align the se'ctions 24.

and 27in foldedposition- 27 imq which the resiliently mounted portions 38*of a. pinj'37 extend to detach'ably' connectthe' tip 39 of the strap part 10. The.

i finished appearance'tofthedevice when in folded position; r

A fingerpiece 421 is1f srm ed by extending the topwallleoffthe channel section 14.be-' ne'ath which the thumbnail or finger may-be inserted to initially swing the sections one Ears 36 are formed'adjacent the end section upon the other in moving the same to unfolded position.

By the formation of the spur with its maximum dimensions extending in a longitudinal direction with reference to the device,

as illustrated in the drawings, and causingits edge to do the holding and receiving the friction for snapping the parts to and from closed position, the maximum strength of such fastening is providedwhich willwithing or straightening out of the sections towar'd'ia singleplane to assist in'the' snapping" together of the-parts by the spur 29 extend v ing'thr'u -the openin -'30. I

By the provision of an elastic or yielding action between the strap and the extension the same may be-worn with greater comfort on the wrist of the wearer and yet an added extension may be securedjwheredesired for positlon'ing the same over an unusually large hand, I p I The foregoing description is-directed solely towards the construction illustrated, but I desire ittobe understood that I reserve the privilege of resorting toall the'mechanical changes to which the device is susceptible,

theinvention b'eing' defined and limited only by the terms of the, appended claims;

I claim: a

V 1. In a-w'ri st watch strap, an extension do vicecomprlsing aplurality of sections hinged together to'be'folded one-on another, one" of said sections having an opening therethrou'gh, a spur on a second section positioned to extend through said opening, said spur having its greatest resistance tobending ly-' ing onfa plane extending generally'longitudi nallv of the device with its edge distal from the hinge connection having an overhanging portion to extend over the edge of said opening remotefro'rn the hinge cor' nection toiho'ld thesection's together, there being sufficient resiliency of the'parts longitudinally of'the dc vice toipermit said spur to be frictionally withdrawn from said opening, and a thirdsection havingdepending' sides within which said other sectionsn'est-f when in folded position.-

2. Inea-jwrist watch strap, an extension d e-c 'vieecomprising arplurality of shee'tmetal sect-ions hinged together to be foldedzone on another, one of said sections having an openlng therethrough,-sa spur on a second section posltioned t o'extend through sa1dopen1ng,

said spur being struckup from the sheet stock and lying in a plane generally longitudinally of the section and presenting its edge for cooperating with the edge of said opening remote from the hinge connection to hold the sections together and aligned in folded position, and a third section having depending sides within which said other sections nest when in folded position.

3. In a wrist Watch strap, an extension device comprising a plurality of sections hinged together, one of said sections having an openin g therethrough, a spur on a second section positioned to extend through said opening,

. said spur comprising two separate sheet metal parts struck up transversely from the section on which they are positioned and meeting at their opening entering end and having their edges overhanging in a direction longitudinally of the device to engage the edge of the opening remote from the hinge connection whereby a longitudinal resiliency is required to snap the parts to and from engagement, and a third section having depending sides within which said other sections nest when in folded position.

4. In a wrist watch strap, an extension device comprising a plurality ofsections hinged together, one of said sections having side ears between which one end of the strap is secured, another of said sections being channel shape with side walls, the edges of saidears and the end edges of said side walls being shaped to fit together, and means for moving and holding said edges in abutting relation whereby there is no gap between them. 7

5. In a wrist watch strap, an extension device comprising a plurality of sections hingedly connected together to unfold to temporarily lengthen the strap, one of said sections being channel shaped in cross section, a cross bar extending between the walls of said channel section adjacent one end thereof, a U shaped slide mounted in said channel section about said bar, a spring acting between said bar and the bridge portion of the U-slide, one of the arms of the U-slide having fingers to extend over the other arm for securing one end of the strap between the arms of said slide, and means for attaching the free end of another of said sections to another end of the strap.

In testimony whereof I aflix my signature.

EDWIN G. CARLSON.

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