US1729736A - Valve-spring compressor - Google Patents

Description

2 Sheets-Sheet 2 ,T. F. CLARY VALVE SPRING COMPRESSOR Filed Aug. 1, 1928 Oct. 1, 1929.

m a W F, M s a M W k 5 w. I f. MN mm z i% 3 4 M I 5% MW fi v Patented Oct. 1, 1929 THOMAS F. CLARY, OF COUNCIL GROVE, KANSAS VALVE-SPRING COMPRESSOR Application filed August 1, 1928.

My invention relates to tools for use in the removal of weak and broken springs from the overhead valves of internal combustion engines, and my object is to provide a simple, inexpensive and eificient tool of this character whereby the work of removing said springs can be greatly expedited.

In order that the invention may be fully understood, reference will now be had to the accompanying drawings, in which:

Fig. 1 shows the initial position of the tool as applied to the overhead valve mechanism of an internal combustion engine.

Fig. 2 shows how the springs are compressed by the tool preparatory to removing said springs.

Fig. 3 is an enlarged section on line 3 of Fig. 1.

Fig. t is an enlarged section of the tool frame on line H of Fig. 1.

Fig. 5 is an enlarged cross section on line 5-5 of Fig. 2.

Referring in detail to the drawings, A designates the upper portion of a valve in the head internal combustion engine, such, for instance, as those used on motor vehicles. C designates one of the valves, 1) the valve stem, E the valve stem guide, F the two-piece tapered key mounted in the upper recessed por- 3: tion of the valve stem D, G a cap mounted upon the key F, H and I the valve springs which are interposed between the cap F and a part of the upper portion A of the engine,

J the rocker arm for opening the valve C against the action of the springs H and I, K

the shaft upon which the rocker arm J is mounted, L an adjusting screw threaded in the opposite end of the rocker arm J from that which engages the upper end of the valve stem D, M a lock nut threaded upon the upper portion of the screw L, and N the push rod which is connected at its upper end to the lower end of the adjusting screw L and adapted to cause the rocker arm J to open the valve C.

The foregoing mechanism is of ordinary construction and forms no part of the pres ent invention which consists of the tool which I will now proceed to describe in detail. 2 designates a frame consisting of a pair of par- Cal Serial No. 295,767.

allel bars a curved upwardly at their ends as indicated at 6 and 8. The bars 4 are spaced apart to receive the upper end of a hook 10 and one end of a hand lever 12. The hook 10 is secured to the bars 4 by suitable means n such as a rivet 14 while the hand lever 12 is connected by a pivot 16 to the ends 8 of said bars 1-.

18 designates a supporting member having a bifurcated upper end 20 and adjustably connected to the bars 4 by suitable means such as a bolt 22 adapted to pass through any of the holes 24 in said bars 4. The lower end 26 of the supporting member 18 is tubular in form to pass over the upper end of the adj ust H5 ing screw L and rest upon the lock nut M.

28 designates a presser bar extending between the parallel bars 4 to the upturned ends 6 of which it is operably connected at one end by a pivot 30. The opposite end of the presser bar 28 is operably connected by suitable means such as a bolt 32 to the upper portion of a leg 34 which has a plurality of holes 36 so that it may be adjusted up or down on the bolt 32.

The lower end of the 34. is provided with a presser foot 3? of arcuate or horse shoe form to conform more or less to the curvature of the cap G upon which it is adapted to rest. The presser foot 37 is pro- :fi vided with a. plurality of dep nding lugs 38 adapted to engage the periphery of the cap G and thus prevent accidental lateral displacement of said presser foot while resting upon the cap G. The presser bar 28 is adapt ed to be forced downwardly with the leg 3% by the cam-shaped portion 40 of the hand lever 12.

In practice when it is desired to remove weak or broken springs from the valve stem D the supporting member 18 and the leg 3% are adjusted upon the bars 4 and the bar 28, respectively, so that the tubular member 26 will rest upon the lock nut M and the presser foot 37 upon the cap G. The hand lever 12 is then swung upwardly to the position dis closed by Fig. 1 and the hook 10 is adjusted beneath the adjacent portion of the rocker arm J, the forward end of which latter has been previously raised above the upper end of the valve stem D as shown on Fig. 1 by adjusting the screw L upwardly in the rear end of said rocker arm J, the object being to obtain as much space as possible between the forward end of the rocker arm J and the upper end of the valve stem guide E so that the springs H and I can be readily removed as will hereinafter appear. After the tool has been placed in position upon the valve mechanism as stated, the hand lever 12 is swung downwardly to the position disclosed by Fig. 2, which operation causes the cam 40 to rock downwardly against the presser bar 28 and force the free end thereof oownwardly with the leg 34; and the presser foot 37, which latter in turn forces the cap G downwardly below the two segmental sections forming the key F which either falls out or is removed from the upper grooved portion of the valve stem D. The hand lever 12 is then thrown back to the position disclosed by Fig. l to permit the springs H and I to expand and raise the cap Gr, together with the presser foot 37, the leg 34: and the presser bar 28 until checked by the latter coming into contact with the hand lever 12. The tool is then removed from the valve mechanism after which the cap G is lifted from the valve stem D so that the broken or weakened valve springs H and I can be readily removed and replaced with others. During the foregoing operations the valve C is supported by a tool ll so that it cannot move downwardly far enough to allow the upper end of the valve stem D to pass below the upper end of the guide E where it could not be reached, after removal of the key F. The forward portion of the tool it is inserted in the combustion chamber 0 through a hole P from which the spark plug has been removed. The tool 44 is provided intern'iediate its ends with a fulcrum 46 upon which it is rocked to lower the valve C until the upper end of the stem D is on a level with the upper end of the guide E, see dotted lines Fig. 2, to leave ample clearance between the upper end of said guide E and the forward end of the rock arm J for removal of the springs H and I.

From the foregoing description it is apparent that I have provided a tool which may be adjusted to fit different valves in the head mechanisms and whereby the time required for the replacement of defective valve springs can be reduced to a minimum, and while I have shown and described the preferred embodiment of my invention I reserve all rights to such other forms and modifications thereof as properly fall within the spirit and scope of the invention as claimed.

Having thus described my invention, what I claim and desire to secure by Letters Patent, is:

1. A tool of the character described consisting of a pair of parallel bars having upturned ends, supporting means for said bars,

a presser bar disposed between said parallel bars and pivotally connected at one end to the upturned ends at one end of said bars, manually controlled means pivotally connected to the opposite upturned ends of the parallel bars and adapted to depress the presser bar, and means controlled by said prcsser bar and adapted to compress a valve spring.

2. A tool of the character described consisting of a suitable frame having a series of holes extending therethrough, a tubular supporting member having a bifurcated upper portion for receiving a portion of the frame and provided with holes adapted to register with any of the holes in the series of said frame, pivotal means adapted to eX- tend through any of said holes and operably connect the tubular member to the frame, a bar operably connected to said frame, manually controlled means for actuating said bar, and means controlled by said bar and adapted to depress a valve spring cap.

A tool of the character described consistingof a suitable frame, a tubular supporting member connected to said frame, a hook connected to said frame, a member operably mounted in said frame, manually controlled means for actuatingsaid member, and means controlled by said member and adapted to depress a valve spring cap.

4. A tool of the character described consistingof a suitable frame, a member operably connected to said frame, manually controlled means for actuating said member, a leg pivotally connected to and controlled by said member, and an arcuate presser foot connected to said leg and adapted to compress a valve spring.

5. In a tool of the character described, a presser foot adapted to compress a valve spring, a leg extending upwardly from said foot, a bar to which said leg is pivotally connected, means for forcing said bar downwardly,a frame to which said bar is operably connected, and a support for said bar.

In testimony whereof I aflix my signature.

THO-MAS F. CLARY.

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