US1889915A - Valve spring retaining device - Google Patents

Description

Bea 1932. c. H. COLE 1,889,915

VALVE SPRING RETAINING DEVICE Filed Jan. 51. 1931 Era INVENTOR ATTORNEY Patented Dec. 6, 1932 CLARENCE H. com, on THE UNITiin s'rarrns navy vALvn srnrne nn'rnrniue nnvrcn Application filed January 31, 1931. Serial No. 512,643.

(GRANTED UNDER THE ACT OF MARCH 3, 1883, AS AMENDED APRIL 30, 1928; 3'70 0. G. 757) vide a tool to enable the mechanic to expedite the removal of rocker arms, push rods and the like without thev necessity of displacement of the valve assembly.

A furth r object of'my invention is to provide a device of the character described that will require but one adjustment, and one which will permit the uninterrupted atten-;

tion of the user, and free use of both hands in the dismantling of the parts to be removed for adjustment, overhaul or replacement.

Further objects of my invention will appear more fully hereinafter.

It has heretofore been the practice during the overhaul and adjustment of poppet valves of radial air-craft engines, after the springs of the same have been compressed, to wedge a wooden block into the cylinder chamber in order to hold the valve spring compressed while replacements and adjustments are .being made to the rocker arm and the like parts.

The practice of inserting blocks however results not only in forcing the parts out of shape, but causes splinters of wood and dirt to be deposited in the engine chambers. My invention consists substantially in the construction, combination and arrangement of parts associated therewith or as will be more fully set forth as shown in the accom panying drawing and finally pointed out in the appended claims.

Reference is to be had to the accompanying drawing forming a part of this specification in which like reference characters indicate corresponding parts throughout the sev- 5 eral views and in which:

bustion engine in which is located the usual valve stem 21, valve guides 22, retaining cap a 23 and valve springs 24.

Clamped in position on the wall 25 of the valve spring housing 20 is shown my valve 0 spring retaining device. This device has the shape of an inverted U clamp, and has a short leg 1, and along leg 2. The leg 1 terminates in a boss 3, which is threaded to receive cor responding threads of a set screw 4. This screw l is provided at one end with a winged grip 5, while at the other end it terminates in ahead 6, in which is secured leather or fiber washers 7 for Contact with the housing walls. The head 6 is in form of guide block 8 which is located in a recess 9 in the leg 1.

The leg 2 is preferably longer than the leg 1, and terminates in an onset contact member 10, which is shaped to fit the valve spring retaining cap 23. The member 10 is provided I with a lip 11, for engagement with the retaining washer 26 of the valve stem 21. For the purpose of assuring perfect contact upon the cylinder surface the inner face of the leg 2 is provided with a machined boss 17 in alignment with, and opposite to the set screw 4.

It will be understood that the above description and accompanying drawing comprehend only the general and preferred embodiment of my invention and that minor-detail changes in the construction and of parts may be vmade within the scope of the appended'claimswithout sacrificing any of the advantages of my invention.

The above described invention may be used 9 by or for the Government of the United States for Governmental purposes without the payment to me of any royalty thereon.

What I claim is as follows:

In a valve spring retaining tool, a clamp tensioning means on one leg of said clamp, said tensioning means comprising a threaded screw member having a winged operating member on its outer end, and a cushioned head on its inner end; and another leg having an offset work engaging finger at its ex-,

treme lower end and extending outwardly, j g said other leg having a boss on its inner side in alignment with the cushioned headof V said one leg. 7

CLARENCE H. COLE,

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