US1763353A - Wrench - Google Patents

Description

June '10, 1930. I w. M. HELLER 1,753,353

WRENCH Filed June 25, 1929 INVE 6R M 1- I ATTORNEY if jpatented June 10,. 1930 MWALTER MILLWARD HELLER, or NEWARK, NEW JERSEY WRENCH Applicationfiled June 25, 1929. Serial No. 373,655.

This invention relates to improvements in 1; wrenches and more particularly to a special service type of wrench of improved design and construction adapted forfire department use,

automatically grippingthe varied sizes of j pentagonally headed valvestemsof fire hy- 1 drants and in addition being formed to operatively engage with both the pin type and r wise thesuction coupling over a wide range [of sizes as commonly used. Important features of my improved wrench 1 comprise a novel design and correlation of a is fixed and spring actuated movable jaw adapted for successfully gripping pentagona1 heads of valve stems or nuts of a wide range of sizes and to be operablewith a ratchet actionfor the manipulation of the nuts M as is highly desirable where rapid action is ,1 9 required; the provision of an additional grip- 2 J lping portion peculiarly designed for efiecj tively engaging with the pin type or rocker type of hose couplings of the varied more zfiuniversally used sizes and likewise having special provision for operatively engaging with the pin lugs of the relatively larger size suction couplings of fire apparatus.

. The foregoing and other valuable features to and advantages of my present invention will be more readily understood by reference to j the accompanying drawing wherein like reference characters are applied to the corre- 1 sponding parts in the several views. Referring to the drawing:

Fig. l is a view of my improved wrench in side elevation. i Fig. 2 is, a view thereof in end elevation,

taken from the left of Fig. 1. v Fig. 3 is a detail view in side elevation showing the manner of engagement with the j :1 .pin type of hose coupling. Fig. 4 isa similar view showing the man ner of engagement with the rocker type of hose coupling lug.

f Fig. 5 is a detail view in side elevation of a rocker type lug of a hose coupling.

In the approved embodiment of the invention as here disclosed, 1 indicates the bar or handle portion of the wrench forming at one Q5 to this end being designed for adjustably and Q rocker-lug type of hose couplings and likeend 2 a rigid jaw member having the round 1 ed surface 3. To the rigid jaw portion of the wrench thereflis pivotally supported the swinging jaw 4: having a shank portion 5 fittedwithin thecross slot 6 in the rigid jaw portion and secured by the pivot pin 7 The shank portion 5 of the swinging jaw is formed with the shoulder 8 engaged by the ends of flat springs 9 secured at their opposite ends to the bar 1 by a rivet 10, the spring being operative to influence the movement of the shoulder portion 8 toward the right as shown in Fig. 1. As the center ofthe are or arcs describing the curved face of the rigid jaw is to the left (in Fig. 1) of the'pivot pin 7 such movement will tend to close the swinging jaw with relation to the rigid jaw as will bereadily understood. The shank portion of the swinging jaw may desirably extend through thecross slot 6 as shown with a rounded projection adapted to be engaged by the thumb for manually opening of the jaw against the influence of the spring.

An important feature of the presentinvention consists in the specific relative form and arrangement of the rigid and swinging jaws as a result of which a successful and effective gripping of pentagonally formed nuts or heads is accomplished while allowing adjustability to a wide range of sizes and permitting of a ratchet action for renewing of the grip as the nut is tightened. In addition to the relative arrangement of the center of the arcs describing the surface 3 and the center of the pivot 7 further features contributing to the successfuloperation consists of the improved form of the jaw engaging surfaces including the arrangement of the swinging jaw straight surface 12 whereby it will have an angular relation of substantially seventy degrees with reference to a line passing through the pivot center and through the point of intersection between said surfaces as shown. As a result thereof, in the instance of pentagonally formed heads or nuts, a flattened surface of the nut will befopposed to andenga'ged by the curved surface of the rigidjaw at varied points thereon corresponding to the size of the nut engaged. In further accordance with the present in-

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