US2523069A - Universal cam action valve lifter - Google Patents

Description

Sept. 19, 1950 F. M. sLAcK 5 9 UNIVERSAL GAM ACTION VALVE LIFTER Filed Jan. 3, .1947 2 Sheets-Sheet 2 ATTEI RN EYS bolts 4 or the like.

Patented Sept. 19, 1950 i UNITED STATES PATENT OFFICE i I %23,069 l UNIVERSAL ACTION VALVE LIFTER I Francis M. Slack, Pecos, Ten. Application January 3, 1947, Serial No. 72.0,067

Claim. (Cl. zaa-283 v l This inventionirelates'to internal combustion engines, and, more particularly, to a tool for facilitating the lifting of valves in such engines.

so that the valve can be Conveniently and easily lifted and removed.

A further object is to provide a tool for disconnecting a valve stem from a valve spring, which tool is simple and quickly placed in position to counteract the force of a valve spring so that the stem can be freedand the valve lifted.

These and other objects are attained by the nove] Construction and arrangement of parts hereinafter described and illustrated by the accompanying drawings, forming a part hereof, and in which:

Fig. 1 is a side View of the device embodying the invention, with the valve inits usual position and the stem connected to the spring.

Fig. 2 is a side View showing the device in a position disconnecting the valve spring from the valve stem so'that the valve can be removed.

` Fig. 3 is an end View of the device.

Fig. 4 is a sectional View taken on the line 4-4 of Fig. 2.

Fig. 5 is a sectional View taken on the line 5-5 of Fig. 3.

Fig. 6 is a sectional view taken on the line 6-6 of Fig. 3. i

Referring to the drawings, the valve lifting device is shown to com'prise a bar l which is movable through a U-shaped yoke 2 having horizontally extending arms 3 secured together by At 'the ends of the arms 3 isa oating disc 5 arranged to bear down on a valve, the disc 5 being pivotally connected at 6 to downturned portions 'I of the arms 3.

Bolts 8 attached'to the sides of yoke 2 are positioned in slots 9 of straps IO for guide pur-` poses, the straps being attached to an upper' yoke I l which is movable -on the bar I, the yoke Il being U-shaped. Between the legs l2 of the yoke H is a block |3 having an inclined surface -l4 adapted to engage a movable wedge [5 which is normally urged downwardly by a spring 16 which rests in a recess in the Wedge I5 and in a recess in the block l3.

Pivoted to the legs l2 is a lever 20, the fulcrum being at ll. At one end of the lever is a cam |8 having a pointed end [9 adapted to' engage and raise the wedge !5 to release the yoke ll from engagement with the bar l, the Wedge normally bearing tightly against the bar l when forced down by the spring [6.

At its lower end the bar l has on one side a shoulder 2l and on the other side an inclined cut out portion 22. Engaging the shoulder 2I is a U-shaped yoke 23 having a pin 24 passing through the legs25 thereof, the pin being positionedin ;the cut outportion 22. The legs 25 have at their ends curved flanges 26 having horizontal spaced lips` 21. The legs 25 also have passed therethrough a pin 28, which is encircled by a spring 29 bearing against one leg 25 and against a nut 30 threaded on the pin 28, so that the jaws formed by the flanges 26 and lips 21 can be closed or expanded.

In operation, the lips 21 are positioned beneath the fiange 3| of the conical member 32 which is part of the usual valve structure, the valve spring 'resting on the fiange 3 l. Wedged into the member 32 is a conical member 33 having ribs 34 which fit into grooves 35 in a valve stem. When the ribs are Wedged into the grooves, the valve cannot be lifted except by the usual movement of the tappet.

To raise the member 32 against'th force of the valve spring, the lever 20` is raised to the position shown in Fig. 2 to bear down on the yoke 2. The Wedge 15 is forced down by spring !6 to grip the bar I. The force of the cam [6 -on yoke 2 raises the bar I through yoke 2, and raises the member 32 from engagement with the member 33 so that the latter can be removed from engagement with the valve 'stem and the latter freed so that the valve can be lifted. The cam is of such a shape that-it is self looking when in the position shown in Fig. 2.

The yoke 23 can be easily removed from the bar I, by raising th front thereof.

It will be seen that there has been provided a simple device for quickly and Conveniently releasing a valve stem from a valve spring so that a valve can be removed.

The above description is to be considered as illustrative and not limitative of the invention of which modifications can be made without departing from the spirit and scop of the invention as set forth inthe appended claim,

2,523,oe9 e i.

The invention having been described, what is claimed is:

In a tool, the combination of a bar, an upper yoke means slidably mounted on said bar, a strap pivoted to said yoke and having an elongated slot, a lower yoke means slidably mounted on said bar, and a bolt attached to said lower yoke means and extending through said elongated slot of said strap Whereby the relative spacing between said upper and lower yoke means is controlled, means at one end of the bar cooperating with the upper yoke means for receiving an object, a block on said upper yoke means having a tapered groove open to said bar, a wedge movable in said groove and slidable against said bar, spring means in said groove biasing said Wedge out of said groove and against said bar, a lever pivotecl to said upper yoke means, and a cam on said lever, said cam having a cam surface engaging said lower yoke means whereby pivotal movement of the lever from an initial position in one direction forces the cam surface to separate the upper and lower yoke means relative to each other, said cam having an end. portion adapted to engage the wedge Whereby return pivotal movement of the lever to its initial position forces the cam end portion to engage said wedge to release both said yoke means for sliding movement along said bar.

FRANCIS M. SLACK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,311,805 Davies July 29, 1919 1318344 Anderson Oct. 14, 1919 1,607,866 Carr Nov. 23, 1926 1,615,053 Szandrowsky Jan. 18, 1927 1,739,391 Essen Dec. 10, 1929 1,862,465 Brown June 7, 1932 1,913,084 Kulp et al. June 6, 1933

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