US1357817A - Lifting-tool for explosion-engine-valve rocker-arms - Google Patents

Description

H. w. PA INE.

LIFTING TOOL FOR EXPLOSION ENGINE VALVE ROCKER ARMS.

@NVENTO'R WITNESSES ATTOR N EY HENRY W. PAINE, OF EAGLE GROVE, IOWA.

LIFTING-TOOL FOR EXPLOSION -ENGII TEVAL VE ROCKER-ARMS.

Specification of Letters Patent.

Patented 0v. 2, 1920.

' Application filed February 28,1919. Serial No. 279,711.

To all who m it may concern:

Be it known that I, HENRY WV. PAINE, a citizen of the United States, residing at Eagle Grove, in the county of Wright, and State of Iowa, have invented a new and useful Lifting-Tool for ExplosionJilngine- Valve Rocker-Arms, of which the following is a specification.

This invention has reference to lifting tools for explosion engine valve rocker arms, and its object is to provide a tool by means of which the valve springs of certain types of explosion engines can be easily compressed, thus freeing the valve from the lifting rod and allowing the outer end of the rocker arm to be dropped down preparatory to removing the valve from the motor The invention is designed particularly for use in connection with the engine of an automobile known in the trade as the Buick automobile, but may also be used with other types of valve-in-the-head motors.

In the type of motors referred to the valve springs are compressed, in the operation of the motor, by a rocker arm actuated by a lifter rod. When it is desirable to remove a valve the rocker arm must be tipped to a greater extent than usual in order to release it from the lifter rod, thereby demanding a compression of the valve spring to a corresponding extent. These operations have usually heretofore been done by prying the rocker arm with a screwdriver or some other ordinary tool, such as a wrench or a pair of pliers, but as the valve springs are very stiff such methods of compressing the springs are unsatisfactory, slow and at times quite difficult.

The invention comprises a tool shaped to grasp the rocker arm in a manner giving ample leverage to compress the spring and thereby lift the other end of the rocker arm to an extent permitting its disengagement from the lifter rod, and then the valve may be easily removed for repairs, grinding or replacement.

The Buick automobile diflers, in the rocker arm construction, in the more recent models from earlier ones, this requiring some differences in the parts of the rocker arm lifting tool so that such tool may be used, especially in garages and repair shops for different types of machines upon which work must be done, and the invention pro vides a tool of correspondingly wide use.

The invention will be best understood from 'a consideration of the following detailed description taken in connection with the accompanying drawing forming part of this specification, with the understanding, however, that the invention is not confined to any strict conformity with the showing of the drawing, but may be changed and modified so long as such changes and modifications mark no material departure from the salient features of the invention as expressed in the appended claim.

In the drawing Figure 1 is an elevation showing the application of the tool of the invention to a Buick rocker arm of earlier models.

Fig. 2 is a similar view of the tool ap plied to a'Buick rocker arm of the most recent model.

Fig. 3 is a perspective view of the tool.

Fig. 4 is an elevation of one end of the tool.

Referring to the drawing, there is shown in Fig. l a rocker arm 1, valve stem 52, valve spring 3, lifter rod'c, and support 5 for the rocker arm, as used in the 1918 and earlier models of the Buick automobile. In Fig. 2 i

there is shown a rocker arm 1, valve stem 2, spring 3, lifter rod 4: and support 5 for the rocker arm, as these parts are madein the 1919 model of the Buick automobile.

The tool, whichis best shown in Fig. 3, comprises a bar 6, which maybe made of flat bar steel, of,'say, quarter inch gage and about an inch wide and nine or ten inches long, although these particular dimensions are by no means obligatory. One end of the bar has a continuation in the form of a bend 7 at an obtuse angle to the length of the bar and this bend terminates in a fork 8 pro jecting laterally from the angular portion 7. The fork 8 projects at an obtuse angle to the continuation 7 and makes about a right angle continuation of the bar 6. The fork 8 has curved or bowed legs approaching at their free ends. The other end of the bar 6 is formed into two spaced and substantially parallel legs 9 in actual or approximate alinement with the length of the bar 6.

The rocker arm 1 or 1 has at the end remote from that engaging the valve stem 2-, a head or enlargement 10 in which there is a socket for a ball projection 11 on the lifter rod 4:. In the earlier models of the rocker arm, as shown in Fig. 1, the bar 6 is employed as a lever extension from the ballreceiving socket-end of the rocker arm 1,

V the spring 3 is readily compressed because of the relatively great leverage provided. The socket end of the arm 1 is lifted high enough to release the ball end 11 of the lifter rod 4., so that the latter may be moved out of the way and the rocker arm 1 is than free to fully release the spring. The valve may then be removed and reinserted or replaced by a new one, whereupon, the arm 11 may be moved by the bar 6 as a handle to an extent compressing the spring 3 so that the lifter rod 4: may be properly replaced. The normal position of the parts is shown in full lines in Fig. 1 and the position of the parts when the lifting tool has been operated to compress the spring as shown in "dotted lines.

Because of conditions present in the latest model, the use of the lifting tool applied, as shown in Fig. 1, is not feasible, so the end 1 of the tool havingthe legs 9 is applied to the arm 1 in a manner to straddle the latter and engage the socket enlargement 10 with the fork 8 then remote from the arm engaging part of the tool. This provides long leverage ample to compress the valve spring, but with the tool oppositely related to the rocker arm from the arrangement shown in Fig. 1. Both the inactiveand the active positions of the tool 6 when used on the latest model of the automobile engine are indicated in full and dotted lines in Fig. 2.

By providing in asingle tool means for operating upon different models. of the type of automobile engine for which the tool is intended, the cost of the tool is cheapened and its usefulness is greatly enhanced, although the prime purpose of the tool is the same with respect to both ends thereof, that is, to compress the valve springs of valvein-the-head automobile engines in which the valves are operated by lifting rods through the intermediary of rocker arms.

The fork 8 of the bar 6 is made C-shape with the legs shaped similar to the showing of the'drawing, or otherwise, to prevent the tool from slipping off the rocker arm. slight curvature of one of the legs of the fork 8 aids materially in this respect.

The continuation or bend 7 has the advantage of permitting the bar 6 to lie flat against the ball receiving end 10 of the rocker arm thus bringing the body'of the tool practically parallel with the arm 1 and overcoming any tendency of the tool to turn around on the rocker arm instead of liftin it.

hat is claimed is a A rocker arm liftingtool for automobiles, comprising an elongated bar with one, end bent at an obtuse angle and terminating in a fork atsubstantially right angles to the length of the bar and having the legs of the fork shaped to embrace and grip the rocker arm. I

In testimony that I claim the foregoing as my own, I have hereto affixed my signa- H. H. BAKER.

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