US3138855A - Tool for removing keys on poppet valves - Google Patents

Description

June 30, 1964 C. D, MARSHALL TOOL FOR REMOVING KEYS ON POPPET VALVES Original Filed Oct. 22, 1959 5s L 54V, 54 5,. u ,5 58 2.5i 7 55 59 la Z za .l5-lim I NVENTOR. {4a/e7 ms/mu United States Patent O 3,138,855 TOL FOR REMOVING KEYS N PGPPET VALVES Calvert D. Marshall, 115 E. Leesway Drive, Lexington, Ky.

@riginal application Oct. 22, 1959, Ser. No. 848,054, now vPatent No. 3,065,528, dated Nov. 27, 1962. Divided and this application Sept. 14, 1962, Ser. No. 227,973.

This invention relates to a tool for removing keys from the stems of poppett valves and is a division of application Serial No. 848,054 filed October 22, 1959, and issued on November 27, 1962, as Patent No. 3,065,528.

A further object of the present invention is to provide a tool which will both depress the valve spring and remove the valve key in successive parts of a single stroke.

Still other objects, advantages and improvements will become apparent from the following specification, taken in connection with the accompanying drawings, in which:

FIGURE 1 is a side elevational view, partly in section, showing a key inserting tool according to the invention claimed in the aforementioned patent.

FIG. 2 is an under plan view of the tool according to FIG. 1.

FIG. 3 is an enlarged fragmentary sectional View showing the tool applied to a poppet valve.

FIG. 4 is a detail sectional View of a modified key holder used in the tool according to the present invention.

FIG. 5 is a sectional view of an adaptor for use with a tool according to the present invention.

FIG. 6 is a partial sectional View of a valve spring depressor and key removing element used in the tool according to the present invention.

FIG. 7 is a partial sectional view of the key removing device of the instant invention.

FIG. 8 is an under plan view of the key removing device according to FIGS. 6 and 7.

Referring now to the drawings in detail and to FIG. 1 in particular, the tool as shown here has a cylindrical handle 10, which is preferably knurled on its outside, and which has an axial bore 11 and a counter bore 12, the lower end of the handle forming a hammer means. Within the bore 11 and counter bore 12 there is slidably positioned an operating rod 13 which is screw threaded at its opposite ends. At its upper end the operating rod is provided with a knob 14 and at its lower end is secured by screw threads 15 in an axially positioned bore in a valve spring depressor 17. The valve spring depressor 17 has a flared upper end 16 forming an anvil means and a flared lower end 18 defining a valve cup engaging skirt. Along the axis of the valve spring depressor 17 there is formed from the lower end a bore 19 and a counter bore 20.

A valve key holder 21 is slidably mounted within the bore 19 and the counter bore 20 inside of the valve spring depressor 17. The valve key holder 21 is held within the bore 19 by a coil spring 22, which frictionally engages both the valve key holder and the inner wall of the bore. At the lower end of the valve key holder 21 is formed as an enlarged section or skirt 24, which meets the main cylindrical section in a shoulder 23, on which the lower end of the coil spring 22 seats.

The valve key holder 21 is formed with an internal bore 25, which extends axially from the bottom for approximately halt the length thereof. Also, there is a counter bore 23 in the face of the enlarged bottom section 24, which unites with the axial bore 25 in a chamfered section 26, forming an internal shoulder. Two holes 29-29 extend between the external shoulder 23 and the internal chamfered section 26, parallel to the axis of the valve key holder and positioned on the opposite sides of the latter.

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In FIG. 3 the tool for replacing keys is shown as applied to either the intake or exhaust valve stem on an overhead valve engine. It is, of course, equally applicable to the overhead inlet valve in an F head engine. A reciprocable poppet valve push rod is shown at 30. Adjacent its upper end the push rod has an annular groove 31 in which the annular flanges 33 of the keys 32 t.

A cup 34 has a central hole 35 for receiving the valve push rod 30, a counter bore 36, a horizontal shoulder 37 at the top of the counter bore 36, and an outwardly extending flange 38. Between the cup 34 and some part of the cylinder head, designated generally at 39, there is positioned a coiled compression spring 40, which also surrounds the valve push rod, and abuts lthe ange 38 on the cup 34 at its upper end.

Generally when the keys 32 have been removed from the annular groove 31 in the valve push rod 30, the compression spring 40 will -force the cup 34 upwardly to a level, where the flange 35 on the latter is about even with, or slightly above, the annular groove 31. The keys 32 are semi-cylindrical in shape, and each half has an annular Flange 33 at approximately its mid-height. With the cup 34. in the relative position with respect to the top of the valve push rod 30, as shown in FIG. 3, two of the keys 32-32 may be gripped by the operator betwen his fingers and positioned on the opposite sides of the valve push rod, above the annular groove 31 in the latter. Then the valve key holder 21 will be positioned over the valve push rod 30, with the keys 32-32 within the counter bore 28 in the enlarged bottom section 24 of the valve key holder and their tops abutting the internal shoulder 26 at the ltop of the counter bore. The handle 10 is then brought downwardly with considerable force, striking the upper end 16 of the valve spring depressor 17, `and the lower end 18 of the latter in turn striking the shoulder 37 on the cup 34, depressing the latter against the action of the coiled compression spring 40. The coiled spring 22 will be fully compressed, the inner end of the axial bore 19 in the valve spring depressor 17 striking the upper end of the valve key holder 21 and the enlarged bottom section 24 of the valve key holder driving the keys 32-32 downwardly along the top of the valve push rod 30 until the annular ilanges 33 on the keys are received within the annular groove 31 in the push rod. The tool is now removed from the push rod and, as the enlarged bottom section 24 of the valve key holder 21 releases the keys 32-32 from the counter bore 28, the cup 34 will rise under the action yof the coiled compression spring 40, the counter bore 36 in the cup encompassing the keys and retaining them in position in the annular groove 31 in the valve push rod.

If either or both the keys 32 should become stuck within the counter bore 28 in the lower end of the valve key holder 21, they may be dislodged therefrom by inserting a wire or a long nail through one or both the holes 29 in the enlarged bottom section 24 of the plunger.

In FIG. 4 there is shown a modiiied form of the valve key holder 21a. The enlarged bottom section 24a is united with the main cylindrical body section in a radially extending shoulder 42. Also, the axial bore 25a extends entirely through the valve key holder 21a and is internally threaded at its upper end at 43. A stud bolt 44 is positioned in the upper threaded end 43 of the valve key holder 21a and within the coiled compression spring 22a. Upon inward movement of the valve key holder 21a, the head of the stud bolt 44 will abut the end of the bore 19 in the valve spring depressor 17 as shown in FIG. 1, acting as a stop. This stop means provides for variable positioning of the enlarged bottom section 24a of the valve key holder 21a with respect to the lower end 18 of the valve spring depressor.

In FIG. there is shown an adapter which provides for the tool being used on cups of different shape, for instance a cup which does not have a shoulder 37, but in which the top face of the flange 38 is plane to the outer diameter of the counter bore 36. The adapter is comprised by a cylindrical sleeve and an integral cylindrical bottom section 46. An axial bore 47 is formed part way through the cylindrical bottom section 46. A counter bore 48 through the remainder of the cylindrical bottom section and the sleeve 45, and a counter bore 49 from the face of the cylindrical bottom section.

In use the sleeve 45 of the adapter fits within the bore 20 in the lower end 18 of the valve spring depressor 17 and the cylindrical bottom section 24 of the valve key holder 21 is received within the bore 47.

FIGS. 6, 7 and 8 show the valve springr depressor 17 with the key removing element mounted within same. This element is comprised principally by a cylindrical mounting block 50 and a cylindrical permanent magnet 56 carried thereby. The mounting block is received within the bore 19 of the valve spring depressor 17. It is removably held therein by a spring pressed ball detent 53. A bore 51 extends diametrically of the mounting block but not entirely through same. Within the bore 51 there is a coiled spring 52 which biases the ball 53 into engagement with the wall of the bore 19. An annular groove 54 of semi-circular cross section is provided at the proper height within the bore 19 to receive the ball 53.

The mounting block 50 has an axial bore 55 extending from the bottom for approximately half of its length. Within the bore 55 there is slidably mounted a cylindrical permanent magnet 56. A coiled spring 57 is mounted within the bore 55, with the lower end secured to the top of the cylindrical magnet 56 and its top coil within an annular recess 58 formed at the inner end of the bore 55. The mounting block 50 and the liared lower end 18 of the valve spring depressor 17 together define an annular key receiving cavity 59.

In use the valve spring depressor 17, with the mounting block 50 and the cylindrical magnet 56 in the position shown in FIG. 6, is positioned over the top of the valve push rod 30. The handle 10 is then brought down with considerable force, striking the upper end 16 of the holder 17. The lower end 18 of the valve spring depressor defining a valve cup engaging skirt means in turn strikes the flange 38 on the valve cup 34, depressing the latter against the action of the coiled compression spring 40. The cylindrical magnet 56 comes into Contact with the top of the valve push rod 30. Keys 32-32 fall out of the annular groove 31 in the valve push rod 30 and are received within the counter bore 20 in the lower end of the valve spring depressor in the key receiving cavity 59. The coiled spring 57 yields and the cylindrical magnet 56 moves upwardly within the axial bore 55 within the block 50 until the keys 32-32 within the counter bore 20 in the lower end of the valve spring depressor 17 reach the top of the valve push rod, where they are attracted by the cylindrical magnet 56. The tool is then removed from the valve push rod 30, carrying the keys 324-32 with it.

Having now fully described my invention, what I claim as new and useful and desire to secure by Letters Patent of the United States is:

1. An impact tool for removing split keys having franges engaging in an annular groove in a poppet valve push rod wherein a cup surrounds the push rod opening toward the end thereof and held in place by the keys with a spring biasing the cup outwardly of the end of the push rod, said tool comprising valve spring depressor means having one end forming an anvil means, hammer means engageable with said anvil means, the other end of said depressor means including a valve cup engaging skirt means for pressing said cup against the force of the valve spring, depressing the latter, on engagement of said hammer means against said anvil means, a mounting block secured within said depressor means coaxially with said skirt means, said skirt means and said mounting block defining therebetween a key-receiving cavity, and a spring pressed magnetic means slidably carried within said mounting block coaxially with said skirt means whereby the keys are magnetically held within said key-receiving cavity after the cup has been depressed against the force of the valve spring by said depressor means.

2. An impact tool for removing split keys having flanges engaging in an annular groove in a poppet valve push rod wherein a cup surrounds the push rod opening toward the end thereof and held in place by the keys with a spring biasing the cup outwardly of the end of the push rod, said tool comprising an operating rod, a massive handle defining a hammer means and slidably surrounding said operating rod, a valve spring depressor fixed to the lower end of said operating rod, said depressor having an enlarged head defining an anvil means impacted by said hammer means and an enlarged lower end, an axial bore defined in said depressor, an enlarged counterbore coaxial with said bore defined adjacent said enlarged lower end forming a skirt engageable with the cup, a mounting block secured within said bore and having portions extending within said counterbore, an annular key-receiving cavity dened by said skirt and said portions of said mounting block, an axial bore defined within said mounting block having an open end and extending part Way into said mounting block from the end of said mounting block adjacent said counterbore, a magnet means slidably received within said axial bore in said mounting block, and spring means normally biasing said magnet means out of said open end of said axial bore in said mounting block whereby the keys are magnetically held Within said key receiving cavity after the cup has been depressed against the force of the valve spring by said depressor means.

References Cited in the file of this patent UNITED STATES PATENTS 512,381 Keyes Jan. 9, 1894 2,051,953 Leathers Aug. 25, 1936 2,069,133 Clossey Jan. 26, 1937 2,177,232 Tinnerman Oct. 24, 1939 2,427,045 Cook Sept. 9, 1947 2,434,456 Cook Jan. 13, 1948 2,742,689 Rocha Apr. 24, 1956

Claims (1)

1. AN IMPACT TOOL FOR REMOVING SPLIT KEYS HAVING FLANGES ENGAGING IN AN ANNULAR GROOVE IN A POPPET VALVE PUSH ROD WHEREIN A CUP SURROUNDS THE PUSH ROD OPENING TOWARD THE END THEREOF AND HELD IN PLACE BY THE KEYS WITH A SPRING BIASING THE CUP OUTWARDLY OF THE END OF THE PUSH ROD, SAID TOOL COMPRISING VALVE SPRING DEPRESSOR MEANS HAVING ONE END FORMING AN ANVIL MEANS, HAMMER MEANS ENGAGEABLE WITH SAID ANVIL MEANS, THE OTHER END OF SAID DEPRESSOR MEANS INCLUDING A VALVE CUP ENGAGING SKIRT MEANS FOR PRESSING SAID CUP AGAINST THE FORCE OF THE VALVE SPRING, DEPRESSING THE LATTER, ON ENGAGEMENT OF SAID HAMMER MEANS AGAINST SAID ANVIL MEANS, A MOUNTING BLOCK SECURED WITHIN SAID DEPRESSOR MEANS COAXIALLY WITH SAID SKIRT MEANS, SAID SKIRT MEANS AND SAID MOUNTING BLOCK DEFINING THEREBETWEEN A KEY-RECEIVING CAVITY, AND A SPRING PRESSED MAGNETIC MEANS SLIDABLY CARRIED WITHIN SAID MOUNTING BLOCK COAXIALLY WITH SAID SKIRT MEANS WHEREBY THE KEYS ARE MAGNETICALLY HELD WITHIN SAID KEY-RECEIVING CAVITY AFTER THE CUP HAS BEEN DEPRESSED AGAINST THE FORCE OF THE VALVE SPRING BY SAID DEPRESSOR MEANS.

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