US1710797A - Hand tool for compressing valve springs and for analogous purposes - Google Patents

Description

April 30, 1929- H. "r. GIRDLESTONE ET AL 1,710,797

HAND TOOL FOR CQKPRESSING VALVE SPRINGS AND FOR ANALOGOUS PURPOSES Filed larch 29. 1926 M Herbert 77mm 'drdlzstom,

Patented Apr. 30, 1929.

UNITED STATES PATENT OFFICE.

HERBERT THOMAS GIRDLESTONE AND J'AMEB REST, OF LONDON, ENGLAND.

HAND TOOL FOR COMPRESSING VALVE SPRINGS AND FOR ANALOGOUS PURPOSES.

Application filed March 29, 1926, Serial No. 98,125, and in Great Britain January 20, 1996.

This invention relates to hand tools of the prising, compressing or cramp type, and has for its object to provide a tool of simple and compact, but nevertheless efficient, construction.

A tool embodying the invention comprises a frame, a member movably supported by the frame and adapted to engage and disengage or grip and release the article to be operated upon, and mechanism for actuating the movable member and looking it in the operative position, such mechanism being operable from a point distant from the article in connection with which the tool is destined to be used.

\Ve will now describe, by way 0t example and with reference to the accompanying drawings, one form of tool, constructed in accordance with the invention, specially applicable for compressing thesprings of the valves of internal combustion engines in situ.

Of the aforesaid drawings:

Fig. 1 .is a side elevation representing the tool in the operative position relatively to a valve indicated in dot-and-dash lines, the right-hand and left-hand sides being, for distinction, designated the front and the rear respectively;

Fig. 2 is a corresponding front elevation of the tool;

Fig. 3 is a rear elevation thereof; and

Fig. 4 is a sectional plan of the tool, the

section being taken on the line 4-4 in P Fig. 1.

According to this example, to constitute the aforesaid frame, we construct a member a with a rectangular cavity 5 formed by the front and rear sides 0 and d and the ends 6 and f. To the bottom of the frame a, and at the rear side thereof, we fix a member 9 to constitute a foot or abutment in the use of the tool. This foot or abutment g may be of a jaw or any desired structure, the former being illustrated at h; and, as is also illustrated, it may have a depending retaining or guiding flange i at its outer edge. The frame rear side J, from this member 9' to the top, is cut away or left open in the making, centrally and vertically, to provide a slot 9'. Towards the bottom of the frame a, and in the vicinit of the foot or abutment the ends 6 an Z are cut away to furnish openings or slots and Z; as shown, the slot Z is shorter than the slot is for the purpose that will be explained presently. The

front side 0 is formed with an opening m, and, although not shown, the rear side (l may be formed with a coincident opening or simply a recess.

A member 0 is reciprocably associated with the frame a to constitute the beforementioned movable member. This member 0 comprises a head 10, a body q, anda neck 1* connecting the two. The head p is shaped to conform with the cavity b of the frame a, and the neck 7' with the slot in the rear side (I thereof, while the body q is of a horse shoe structure with a marginal upright ledge s. The member 0 is assembled with the frame a with the head p reposing in the carity I) and the neck 7* in the slot j, hence the body 9 projects from the rear 0! of the frame a.

The aforesaid actuating and locking mechanism comprising a spindle t of any appropriate lengthsuch as to present unimpeded distant operation. The spindle t, near-the rear end, provided with a heart-shapedlike cam u for coactingwith the lower end of the head p of the movable member 0. The cam u is formed with a hump o for in teracting with the slots is and Z in the ends 6 and f of the frame a as hereafter described, the lengths of the slots is and l relae tively to the circumferential length of the cam it being such that the shorter slot 7 functions to impedimentally contact at the top and bottom with the cam u in itstravel' in the upward direction, while the longer slot is permits of unrestricted travel in the opposite direction. The distant or front end of the spindle t is fitted with a tummy-bar w. This mechanism 1) andu is assembled with the frame w and the movable member 0 with the cam u locatcdin the frame cavity 6 below the head p of the movable member 0 and in alignment with the slots in and l in the frame ends e and f, the spindle t passing through the opening m in the front a of the frame a: in which opening m a 'ournal n tits, and its extreme end being tig ted fitted in the cam 21. and riveted over the rearside thereof. Thus the spindle t is rotatably mounted in the frame a. When an opening or recess is provided in the rear side 02 complemental to the openin m, the extreme end of the spindle t is passed through the cam u and journalled therein, the cam being suitably securedto the spindle t.

Briefi the mode of use and operation of the too -assuming means of any approt priate kind have been applied, if required, to the valve to hold it stationary arc as follows:

The tool is suitably positioned, that is, for instance, with the frame a, through the agency of its foot or abutment g, standing upon or co-acting with an appropriate support, such as the crank case, the cylinder base, or, as exemplified, with its jaw 71, and flange 15 embracing the tappet end or nut a", and with the movable member 0 in engagement with thecollar y, or it may be the pin on the valve stem 2, the bifurcated structure of the head p of the member 0 admitting of ready assembly and disassembly and the upright ledge s assuring engagement. Then the shaft t is turned by the tommy-bar w whereupon, through the agency of the cam a, the movable member 0 is lifted with a straightline motion whereby the valve spring compressed, this condition being maintained or locked by the interengagement of the hump r of the cam '20 with the slot if in the end 7 of the frame (IL and thereby admitting of the manipulation. of the requisite valve components, the hump e of the cam 10 projecting through the slot Z and contactually and limitarily hearing at the top and bottom upon the correspoml ing ends of the slot Z. The movable or reciprocable member 0 may be restored by hand to its operative position relatively to the cam. 11- which is returned to its initial position. by turning the spindle t, the slot 71: giving the requisite clearance.

It will be evident from the foregoing that the am device a may be substituted by mechanical equivalents, such as a rack and pinion; and that the structural detai of the too]. may be variously modified without departing from the essential features com- 1 g a reciprocable engaging and disengaging or gripping and releasing member 0 actuatablc by a distantly-operable spindle 6 through interposed interengaging elements, and a frame or support (Z for the member 0, the spindle t and the allied parts.

What we claim and desire to secure by Letters Patent is:

1. A hand tool of the type described comprising, in combination, a frame consisting of a member having a rectangular cavity formed by the sides and the ends and having at the bottom of the rear side a member constituting a foot or abutment in the use of the tool, said rear side having a slot running centrally and vertically from said foot or abutment to the top, and said ends having slots; a member movably supported by said frame and composed of a head, a body and a neck, said head and neck, respectively, conforming to said frame-cavity and said rear-side frame-slot, and on assembly rcposing therein with said body projecting from the roar of said frame; an actuating and locking mechanism including a spindle journalled in said frame, a. cam provided on' said spindle and. located in said cavity below said head of said movable n'iember and in alignment with said slots in said frame ends.

2. A hand tool of the type described con1- prising, in combination, a frame consisting of a n'ien'ibcr having a rectangular cavity forn'ied by the sides and the ends and having at the bottom rear side a member constb toting a foot or abutment of jzuv-strurture, said ir side having a slot running centrnlly and vertically from i-iaid foot or abut ment to the top, and said ends having open ingg s or slots of unequal lengtlua; a member rrriprocably 1-u1morled by said frame and composed of a head, a body and a neck, said head 0 'ul nee a respectively C(Hl'llllllllil}: lo id cavity in said frame and said slot in its said rear side and on assembly rl-posing therein with said body projecting from the rear of said frame, said projecting body being of a lun'sc-shoe-lihc structure with a marginal upright ledge; and actuating and locking mcclmnism for said reciprocablr lnen'lber, said llllft'lltlllf-lll includii a spindle jmirnalled in said mrmbcr, a cam provided on said spindle located in said frame-earltv below said head of said riuriprouiblc member and in alignment with said slols in said frame ends, said cam co opcraling with the shorter of said slots to lock the parts in the operative position.

In testimony whereof, we allix our sin} natures.

l-lEilBiillT THOMAS GlIlDLESTONE.

JAMES REST.

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