US769362A - Spiral spring. - Google Patents

Description

Np. 769,362. PATENTED SEPT. 6. 1904.

A.E.TBRRY. SPIRAL SPRING. APPLICATION IILED JAN. 29, 1904.

NO MODEL.

Ifb venzor www UNITED STATEs Patented September 6, 1904.

ALFRED ERNEST TERRY, OF REDDITCH, ENGLAND.

. SPIRAL SPRING.

SPECIFICATION forming part of Letters Patent No. 769,362, dated September 6, 1904.

Application filed January 29, 1904. Serial No. 191,217. .(No model.)

To all whom it may concern.-

Be it known that I, ALFR D ERNEST TERRY, a subject of the King of Great Britain, residing at Redditch,-England, have invented certain new and useful Improvements in Spiral I Springs, of which the following is a specifica- 'by taking one or more of the end coils and turning them up at right angles to the length of the spring. Consequently that part of the wire which forms the connection between such loop and the coils of the body affords a comparatively weak connection and is veryliable to distortion or breakage by reason of the fact that the strength in the coils of the body is very much in excessof the said bent part.

In this my invention I employ improved means whereby the said loop is supportably connected to one or more (generally two) coils of the body of the spring.

I have illustrated this my invention in the accompanying drawings, to which reference is herein made and in which similar referencenumbers refer to the same thing or part throughout the several views.

Figure 1 is a side view of the-one end of a coil-spring made according to this my invention. Fig. 2 is a sectional View of the end of the spring on line A B. Fig. 3 shows a modification of this my invention in which the supporting attachment is made to serve also as the pulling-loop. Fig. I shows the supporting attachment modified in shape and adaptation to the coiled pulling-loop. Fig. 5 is a sectional view on line C D, showing the rela tive position of the supporting attachment and the coils of the pulling-loop. Fig. 6 is a side View, and Fig. 7 a plan view, of the invention,

showing the supporting attachment carried at right angles to and over the ordinary loop.

Referring to Figs. land 2, 8 represents the coils of the body of the spring, which is coiled in the usual manner.

9 represents one or more coils which have been turned up at right angles to the length of the spring 8, thus forming a loop for the tensional pull of the spring.

10 is a supporting-bar which is carried across from side to side of the coils 8, its end being turned upward andover one or more (but generally two) of the coils 8, the said bar passing over the lower portion 11 of the pulling coil-loop 9. Hence when the said loop is pulled such pull does not depend upon the strength of the connecting bent part 12, but is transferred, by means of the bar 10, to the end coils, which arethus taken hold off.

Referring now to Fig. 3, it will be seen that, if desired, the pull upon the end coils of the spring may be effected without their being turned or at right angles, as shown in Figs. 1 and 2, by making the supporting-bar as shown at 10, so that it may serve as the pulling-loop direct.

Referring further to Fig. 4, it will be seen that the loopingof the shape of the supporting-bar 1O may be somewhat extended beyond that shown in Fig. 3, so as to embrace the exterior ofthe coils of the loop 9, and thus again the pull upon the loop 9 may be said to be practically transferred to the said bar 10 It will be readily seen that the supporting-bar 1O may be carried upon the'interior of the upper part of coil-loop 9, but being upon the eX- terior, as shown, appears to be the most convenient. I

In Figs. 6 and 7 Ihave shown how the supporting attachment-bar 10.may be carried across at right angles to the loop 9 and its upper part lying against the upper part-of said loop, (exteriorly or, interiorly,) so that thesaid loop and the attachment-bar may be simultaneously taken hold of for the pull of the spring.

By these means it is found that by reason 'of taking hold firmly of the two outer end coils of the body of the spring for the pull of the same when the said spring is extended the coils throughout the length of the spring are much more evenly spaced apart than when pulled by the ordinary turned-up end coil.

- the manner herein described and shown such crystallizing action is practically removed, and consequently the life of the spring very much increased.

WhatI claim as my invention, and desire to secure by Letters Patent, is v 1. A spiral spring having a coiled projection at one end thereof, constituting a pullingloop, and means independent of said projection or loop for transferring the effect thereof to the terminal coiled portion of the body of said spring.

2. In spiral springs the combination of the coils 8 of the body of the spring, coil-loop 9, the supporting-bar 10, whose ends are secured to the end coils of the body of the spring, said bar being carried across and above the lower part of the loop 9, as set forth and shown.

3. A spiral spring having a coiled projection constituting a pulling-loop, and a crossbar interlocked with the terminal coiled portion of the body of the spring and arranged to receive the direct pull of said projection or oop.

In testimony whereof I have hereunto set my hand in presence of two sub scribing witnesses.

ALFRED ERNEST TERRY. VVitnes'ses:

J. BERNARD HAYWARD, T. VERNON FELLoWs.

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