US1302975A - Eoldiwx valve-lifter - Google Patents

Description

Patented May 6, 1919,

l. ROSENBERG FOLDING VALVE L'IFTER. \APPLICATION FILED JUNE 3.191s.

INVENTOR ATTORNEY rrn STATES PATENT OFFIE.

ISADORE ROSENBERG, OF PORT CHESTER, NEW YORK.

FOLDING VALVE- LIFTER.

ealers.

Specification of Letters Patent.

Patented May 6, 1919.

Application filed June 3, 1918. Serial No. 237,937.

This invention has for 1ts object to prov vide a simple, inexpensive, compact, easily operated and thoroughly reliable folding tool for compressing valve springs in hydrocarbon engines to permit removal of the valves, the common trade name for this class of tools being valve lifters.

With these and other objects in view, I have devised thenovel' folding spring compressing tool which I will now describe referring to the accompanying drawing formin a part of this specification and using re erencecharacters to indicate the several parts.

' Figure 1 is an elevation of my novel valve lifter, folded as when not in use; p

Fig. 2 an elevation on a reduced scale illustrating the use of thetool in compressing a valve spring to permit removal of the valve, and p Fig. 3 is a perspective view, partly in section, on the same scale as Fig. 1, showing the tool set up ready for use, and illustrat ing its construction.

10 denotes a portion of the cylinder, 11 a portion of the valve chamber, 12 a portion of the combustion chamber, 13 the valve, 14 the valve stem, 15 the spring, 16 the spring seat and 17 the key by which the spring seat is held in place on the valve stem.

These parts are in common use and may having a point 23 which is adapted to engage the center of a valve, as in Fig. 2. The end of the arm is enlarged and the stud is provided with a reduced shank having threaded engagement with a hole 41 in the enlarged end of the arm- The slide is provlded with an angle arm 24 and folding arm 20 is pivoted in a socket 25 in the end of the angle arm, the rear wall of the socket serving 'as a stop to limit the outward movement of the foldingarm. Angle arm 24; is provided with a threaded hole 42 near its outer end which is engaged by the shank of stud 22, in the folded position of'the tool as in Fig. 1, and acts'to retain the parts folded. The lower folding arm is provided at its outer end with a U-shaped head 26 which is adapted to engage the valve stem, as in Fig. 2. The inner end of this folding arm is provided with an angle piece 27 which is pivoted in a slot 28 in the lower end of the body. The back face of the angle piece is adapted to engage the wall of the body to limit the outward movement of the arm. The rear face of the slide is provided with a rack 29 which is engaged by a pinion 30 on a stud 31 pivoted ina housing 32 which is formed integral with or secured to the body. 33 denotes a lever branched at its inner endto straddle the housing, the branches being pivoted on stud 31, the ends of which extend beyond the housing on each side. Socketed in the lever is a sliding dog 34 which is held in engagement with the pinion by a spring 35. The dog has a straight face on one side and a beveled face on the other side, and has a shank 36 which extends longitudinally through the lever and is provided with a knurled finger piece for convenience in operation. The shank may have both longitudinal and rotary movement in the lever, so that when the dog is withdrawn out of engagement with the pinion, the shank and dog may be given a half turn in either direction so as to change the engagement of the straight face of the dog from one tooth of the pinion to the contiguous face of the next tooth and thus reverse the movement of the pinion, and of the slide through engagement of the pinion with the rack, when the lever is oscillated.

37 denotes a block formed integral with or rigidly secured to the housing. Socketed in a beveled face, and on the other side a straight face ada ted to engage the teeth of the rack to 100 the rack against movement in one direction. The dog has a shank 39 extending through the block and having a knurled finger piece for convenience in operation, and is normally held in engagement with the rack by a spring 4&0. This shank also has both longitudinal and rotary movement so that when the dog is withdrawn out of engagement with the rack, the shank and dog may be given a half turn in either direction so as to change the engagement of the straight face of the dog from one tooth of the rack to the contiguous face of the next tooth, and thus reverse the locking action of the dog on the rack. in order to prevent rotation of dog 38, except when it is withdrawn from engagement with the teeth of the rack, I provide a cross pin l?) in shank 39 which engages a slot 4:4: 1n block 37 while the dog is held in operative position by the spring, the pin being withdrawn from the slot when it is required to reverse the dog.

. The operation will be readily understood from Figs. 2 and 3. In- Fig. 3 the dogs are set to move the slide and stud downward relatively to the body when the lever is oscillated. The straight face of dog 34 faces upward, consequently upward swing of the lever will cause movement of the pinign counter-clockwise which will move the slide downward. When the lever is swung downward, dog 34 will slide over the teeth of the pinion. As the beveled face of dog 38 faces upward, the teeth of .the rack will slide over it when the rack is moved downward, upward movement of the rack being prevented by the engagement of the straight face of dog 38 with the upper face of a rack tooth. Before placing the tool in use to compress a valve spring, point 23 and head 26 must be separated far enough, by operation of the lever, to permit the point to be placed in engagement with the center of the valve and the branches of the head to be placed on opposite sides of the valve stem below the key. When moving the slide upward both of the dogs must be reversed from the position shown in Fig. 3,

that is the straight face of dog 34 must face downward and the straight face of dog 38 must face upward. When the dogs are in this position, downward swing of the lever will rotate the pinion clockwise and through the engagement of the pinion with the rack will move the slide upward relatively to the body. I

Suppose now that the dogs are in the position shown in Fig. 3 and that the tool has been placed in operative position, that is with the point engaging the valve and the head in engagement with the valve stem below the key, upward swing of the lever will cause the slide to move downward relatively to the body, the point and the head approaching each other, as in Fig. 2. The operator may now remove the key from the valve stem. The dogs are then reversed and the slide is moved u ward relatively to the body until the sprlng has expanded. The tool is then removed, the spring will drop off from thestem and the valve and stem may be lifted upward and removed.

Having thus described my invention, 1 claim: I 1. A tool of the character described cmprising a body, a U-shaped head carried thereby and adapted to engage a valve stem, a slide having a rack, a point carried by the slide and adapted to engage a valve, a pinion carried by the body and engaging the rack, a lever pivoted to the body, a reversible dog socketed in the lever and adapted to actuate the pinion in either direction to move the head and point toward or from each other, and means for preventing movement of the slide except by actuation of the pinion.

2. A tool of the character described comprising a body, a Ushaped head carried thereby and adapted to engage a valve stem, a slide having a rack, point carried by the slide and adapted to engage a valve, a

pinion carried by the 'body and engaging the rack, a lever pivoted to the body, a reversible dog socketed in the lever and adapted to actuate the pinion in either direction, and a reversible dog engaging the rack and preventing movement of the slide except by actuation of the pinion.

3. A tool of the character described mmprising a body, a slide adapted to pass within the body and having an angle arm, a folding arm pivoted to the body and provided with a U-shaped head, an arm pivoted to the angle arm and adapted to fold over the first mentioned arm, and a stud having a valve engaging point and having threaded engagement with the last mentioned folding arm, said stud also having threaded engagement with the angle arm and acting to retain the arms in the folded position when not in use.

4. A folding tool of the character described comprising a body, a folding arm pivoted thereto and carrying a U-shaped head adapted to engage'a valve stem, a slide adapted to pass within the body, and having an angle arm, a folding'arm pivoted to the angle arm, and a stud having a valve engaging point and having threaded engagement with the last mentioned folding arm whenin use, said stud also having threaded engagement with the angle arm to retain the arms in the folded position when not in use.

5. A tool of the character described commom" v v a prising a tubular body, a. slide adapted to do in the lever which engages the pinion,

pass within the body, folding arms pivoted an a, reversible (10% engaging the rack to to the body and. to the slide respectively, a prevent movement t ereof except by acute- U-sheped head and a valve engaging point tion of the pinion.' 10 5 carried by the body and the slide respec- In testimony whereof I afiix my signature.

tively, a rack, pinion and lever, a reveribde ISADORE ROSENBERG.

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