US1380654A - Valve-lifter - Google Patents

Description

N. G. LARSON.

VALVE LIFTER.

APPLICATION FILED FEB. 19, 1920.

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NILS G. LARSON, 0F ATTLBORO, MASSACHUSETTS.

VALVE-METER.

Specification of Letters Patent.

Patented June 7, 1921.

Application :filed February 19, 1920. Serial No. 360,015.

they city of Attleboro, in the county i of Bristol and State of Massachusetts, have invented certain new and useful Improvements in Valve-Lifters, of which the following is a specification.

rIhis invention relates to so-called valve lifters of the type adapted to compress valve springs suciently to permit the stem pins to be readily extracted so that the valve may be freely removed; and the obj ect of this invention is to provide such a device arranged 1 to engage either one or two valve spring members to raise the same and hold the springs under compression during the removing and repairing operations on the valve.

A further object of the invention is to so construct the device that it may be caused to env'age and operate upon two adjacent valve springs simultaneously, and at the same time be so positioned as to permit free and unobstructed operation upon the valve.

A still further object of the invention is that the lifter is adapted to raise or compress the springs in a straight line and so eectually prevent cramping the same or displacing of the spring during'the lifting operation.

lilith 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 side elevation illustrating my improved lifter as lapplied to the valve springs of an engine.

Fig. 2 is a perspective View showing the inner side of the fulcrum post.

Fig. 3 is a perspective view of the camlifting member.

Fig. l is a perspective view of the springengaging cross-bar member.

Fig. 5 is a perspective view of the fulcrum in. p Fig. 6 is a side elevation illustrating the complete device, showing the cross-bar and cam in full lines, as being in down position and in dotted lines in up or raised position.

With reference to the drawings, 10 designates the cross-bar member which is shown as being of a length suilicient to engage two adjacent valve springs, the same vbeing out out at 11 and 12 onone edge to fit around the valve stem 13.

The center portion of this bar is preferably bent or formed to extend upwardly providing two verticallydisposed side walls 14E' i spaced apart at 15 and connected at their upper ends by a bridge portion 16. Each of these side walls is slotted as at 17 to permit the passage of the pivot or guiding bolt or pin 18 which is adapted to slide therein.

rIhe fulcrum post 19 is preferably formed with a-channel and is adapted to engage one of the side walls 14 of this cross bar to guide the vertical sliding motion of this bar, the lower end 2O of this post being adapted to rest upon the cylinder block 21.

At the upper end of this post I have pivoted a cam member 22 which is also adapted to work in the space 15 between the vertical side walls 14 of the cross-bar. This cam is pivoted by this fulcrum pin 18, its working edge being adapted to engage the under side of the saddle or bridge portion 16 of the bar, and this cam is provided with a handle 23 by the action of which the cross-bar may be raised and lowered.

The operation of the device is as follows Vhen it is desired to operate upon two of the valves it is only necessary to throw my cam handle down, place the fulcrum bar on the cylinder block, as illustrated in Fig. 1, and then pass the bar beneath the spring cups 24 of the springs 25, the upturned corners 26 of this bar serving as positioning stops. Then by lifting the handle from the position shown in full lines in Fig. 6 to the position shown in dotted lines in this figure, the edge of the cam 22 is caused to ride beneath the bridge 16 and raise the cross bar and the springs into the position illustrated in Fig. 1, in whichposition the stem pins 27 are released and adapted to be readily removed and so permit'the valve to be taken out for examination and repairs.

By the use of my improved device I am enabled tooperate upon a single valve spring if desired without engaging both of the adjacent springs.

It will also be noted that by my improved device the lifting motion is in a direct or straight, vertical line and not on a curve or circle which is usually the ease with the ordinary valve-lifting devices, thereby eectually avoiding gripping or binding the stems and also displacing the springs; the device may lift into position and hold the springs compressed during the time that the valves are being operated upon and repaired permitting them to be readily'replaced as many times as desired and when inally in condition the stem pins may be positioned and the springs dropped into engagement therewith Without loss of time.

rlhe foregoing description is directed solely toward the construction illustrated, but I desire it to be understood that l reserve the privilege of resorting to all the f mechanical changes to which the device is susceptible, the invention being defined and limited only by the terms of the appended claims.

I claim: Y Y l l. A valve lifter having a fulerum post, a cam pivoted in said port, and a spring engaging member guided on said post and adapted to be operated by the movement or' said cam to compress said spring.

2. A valve lifter comprising a ulcrum post, a spring engaging cross-bar having an upwardly-extending portion guided on said post, a cam pivoted in said post and arranged to engage and lift said bar, and an operating handle on said cam.

In testimony whereof l affix my signature.

NILS G. LARSON.

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