US1158021A

US1158021A - Valve-grinder.

Info

Publication number: US1158021A
Application number: US3073015A
Authority: US
Inventors: Asa Ashworth
Original assignee: Individual
Current assignee: Individual
Priority date: 1915-05-27
Filing date: 1915-05-27
Publication date: 1915-10-26
Anticipated expiration: 1932-10-26

Description

A. ASHWORTH.

VALVE GRINDER.

APPLICATION FILED MAYZ]. 1915. 1,158,021 a Patented Oct. 26, 1915.

. 2 SHEETSSHEET 1.

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APPLICATION FILED MAY 27. I915. 1,158,021 Patented 001-. 26, 1915.

2 SHEETSSHEET 2.

. UNITED STATES PATENT OFFICE;

ASA ASHWOBTH, 0F SALAMANCA, NEW YORK.

VALVE-GRINDER.

Application filed May 27, 1915.

To all whom it may concern:

Be it known that I, AsA ASHWORTH, a citizen of the United States, residing at Salamanca, in the county of Cattaraugus and State of New York, have invented certain new and useful Improvements in Valve- Grinders, of which the following, taken in connection with the accompanying drawings, is a specification.

The invention relates to valve grinders; and the improvement consists in providing valve grinding mechanism by means of which the valves can be rapidly reciprocally rota-ted with perfect freedom of movement, the spindle for turning the valve being so centered as to tension as to grind all parts of the valve and valve seat equally thereby making a perfect fit between the two parts in the shortest possible time.

A further object is to provide grinding spindles which while having a centering pressure on the valves are so loosely held and surrounded by the reciprocating mechanism as to constantly adapt themselves to any inequality or inaccuracy in the valve and valve seat, thereby greatly aiding in the quick smooth grinding of the parts. It is experimentally found that manual reciprocation is nearly ideal for grinding valve seats. This would of course be tedious and 'tiresome. The adaptability permitted in the loosely mounted spindles gives this ideal adjustment so that with light tension the valve and valve seat are ground to a perfect fit with the least amount of abrasion; and the invention consists in the novel features and combinations hereinafter set forth and ciprocation of the racks and ninions; and

Fig. 4 is a perspective view of the driving mcchanisrnfor the racks and pinions. a portion of the frame being broken away to show the cam on one end of the crank shaft and the attachment of the toothed. rack thereto. fig. 5 is a sectional view at line Y Y in Fig.

2 showing an elevation of one of the brack-' ets for holding one of the spindles with the toothed racks slidably supported therein at Specification of Letters Patent.

Patented 0a. 26, 1915.

Serial NO. 30,730.

each side of the central pinion on the spindle and the means for giving tension to said spindle in holding the valve on its seat while I grlnding. Fig. 6 is a sectional view at line Z Z in Fig. 5 showing the spindle with the pinion attached thereon and loosely mounted between the toothed racks at each side, said racks being slidably supported with a loose fit in the supporting bracket. Fig. 7 is an enlarged perspective view of the end of one of the spindles showing the centering punch in the middle of the flattened end of the spindle; .and Fig. 8 is a'plan view of .the top of the valve with the groove therein showing the round opening in the center of the groove to receive the centering punch on the spindle end. l

Like numerals of reference refer to corresponding parts in the several views;

The numeral 10 designates the metal frame which supports the grinding mechathe shaft 13, the head 11 being clamped on the shaft 13 at any desired height by'means of a suitable bolt through lugs 14, the head being slotted or split at 15. The opposite side of the head has the groove16 within which the

pinions

17 and 18 are 'revolubly mounted. The pinion 18 has the cams "19 on the opposite sides thereof to form the crank shaft, the cams 19 being surrounded bv the rings 20 which have the arms 21 ex- \tending out therefrom for pivotal attachment to the ends of the toothed racks 22 at each side.

The frame 10 has the slotted portion 23 extending out from the head 11, the. closed lengthwise slot 24: extending lengthwise of the'central portion of said part 23 to receive therethrough the extension 25 on the brackets 26, a thumb-screw 27 with washer 28 being attached to the extension 25 to hold the bracket 26 rigidly against the side of part 23 of the frame 10, the thumb-screw permitting the quick adjustment of thebracket 26 at any desired point along the slotted portion 23.

The bracket 26 has the opening 33 therein and the crosswise grooves 29 in the opposite sides thereof with suitable lugs each side of the grooves 29 to hold the racks 22 loosely and slidably in line for their IGCIP";

rocative movement. In order to reciprocally turn the valve :1 spindle 30 is provided in the bracket 26, being loosely mounted through a hole 31 in the lower portion of the bracket. a. threaded opening 32 being provided through the upper portion of the bracket as formed by the ntral opening :3 A

' threaded nut 34 fits within the opening 32 and has the lock nut Z15 thereon for holding it firmly in the adjusted position. The nut 34 has a central lengthwise hole to permit the spindle 30 to slide vertically therethrough. Y

1 A pinion 36 is attached to the spindle 230 within the. opening 13 in the bracket 26 to mesh loosely in the racks 22 at each side and a tension coil spring 37 is provided between the upper end of the pinion 313 and the lower end of the nut 34 to give the desired pr ssure on the valve." The nut 31 is of si iicient lengthso that it may be turned into the threaded opening 32 to thereby give any desired tension to the spring 37 yet permitting the spindle 30 to be manually thrust upward so that the pinion 36 escapes above the racks 22 thereby permitting the free movement of the bracket 26 along said racks without removal of the spindle 30 and the pinion 36 attached thereto. The loose support of the pinion 36 in racks 22 and the spindle 30 in the bracket 26 permits said spindle to adjustitself to any movement or inequality in the grinding of the valve, a movement which is essential to the quick and perfect grinding of the surfaceof said valve.

In orderto center the pressure of spindle 30 on the valve, 'a-groove 38 is provided in the top 39 of-the valve and has the enlarge-.

ment 40 central of said groove 38 to receive point 42 is slightly longer than the flattened wing portions of the bit 41 each side of said point so'that-the pressure of said bit 41 is always central of the valve top 39 since it bears in the enlargement 40. The wing or flat portions of the bit serve only' to rotatively reciprocate the valve. Other means might be provided to reciprocate said valve without departing from my invention sov long as the pressure of said bit is applied through the central portion thereof and not through the wing or extended-portion thereof. v

The driving gear 17 may be power driven but is preferably manually rotated by means of the crank'43 attached to the shaft 44 of the pinion 17 so that all that is necessary to grind the multiple valves of a multiple engine, as for automobiles and other uses, is to provide the number of brackets 26 on the frame 10 corresponding to the number of valves to be ground. ad usting said brackets according to theexact relation of the valves to one another and supporting the frame 10 at the desired height above said valves. The spindles 30 are then manually inserted in the grooves .lh'. and a snllicient amount of abrasive isplaced in the joint between the valve and the valve seat. The spindles Ill arcthen reeiprocally-rotaied by turning the crank 43 thereby recipria-a lly moving the two racks 22 to accomplish said rotation of the spindles. in order to obtain the highest elliciency in grinding the valves the tension should be adjusted as lightly as possible to produce the abrading ell'ect desired otherwise the pe-' riphery ol' the valve will be scored and roughened instead ol smoothed and shaped to a perl'ecl lit with the valve seat.

The light tension ol' the spindle 30 on the valve and the loose holding of said spindle in the ltltkr 22 leave the valve tree to seek a lit on the alve seat as it is continuously reciprocally rotated by said spindle and racks. in order to obtain this continuous drive of the spindles the two driving racks are necessary so that one may alternate the other without pause. the two cams 19 being shaped sothat the alternate driving movement of the racks22 is continuous.

I claim as new:

1. A valve grinder comprising aframe,

brackets on said frame having openings in line with one another therein, a spindle rotiltlVCl) mounted in each of said brackets,

elements movably contacting one. each side of said spindle in said brackets, and means for the alternate movement of said elements to continuously rotatively reciprocate said spindles.

2. A valve grinder comprising a frame,

brackets adjustably attached to said frame havingcpemngs in line with one another therein, a spindle revolubly mounted in holes through each of said brackets, a pinionon each of said spindles within'said opening in each of said brackets, toothed racks slidably supported in" said openings in said bracket one each sideof said pinions to mesh therewith, and means for the alternate movement of said racks to continuously rotatively reciprocate said spindles.

3. A valve grinder comprising a. frame having a slot therein, brackets adjustably attached to said frame at spaced distances in saidslot, said brackets having openings therein in line with one another, a' spindle loosely mounted in each of said brackets to i rotativcfy move the same, a pinion on each of said spindles within said opening in said bracket, t othed racks one each side of said pinion to loosely mesh therewith and slidably supported in the opposite walls of the openings in said brackets, pinions rotatively mounted on said frames, and cams one each side of one of said pinions to alternately reciprocally move saidracks and rotatively reciprocate said spindles.

42 A valve grinder comprising a frame, brackets adjustably attached to saidframe havin openings therein, a spindle loosely and slldably mounted in holes through each of said brackets, a pinion on each, of said spindles within said opening-- in said bracket,

toothed racks slidably supported in said brackets on each side of said pinions to loosely mesh therewith, an adjusting nut threaded in the hole for said spindle in the upper side of said frame having a hole there-through to receive the upper end of said pinion, a coil tension spring between said adjusting nut andthe top of said pinion on said spindle to thereby adjust the pressure of said spindle on the valve, said frame having said opening therein sufliciently large above said pinion to raise said pinion free of said racks for the sidewise adjustment 'of said bracket and spindle, and cams and gearing revolubly mounted in said frame to give an alternate continuous reciprocative -2 motion to said racks and rotation to said spindles.

5. A valve grinder comprising a frame, spindles rotatively mounted 'on said frame, means to rotatively reciprocate Said spindles, a flat bit end on each of said'spindles to engage a groove in thevalve top to rotate the same, a pin central of said bit end havmg a rounded point extending beyond said flat bit end to engage a similarly shaped opening central of said valve top in said groove, said fiat bit endsupported by said pin a spaced distance above the bottom of said crosswise groove in said valve top to permit the adaptive leaning of said spindles in any direction on said rounded point.

In testimony whereof I have affixed my signature in the presence of two witnesses.

ASA ASHWORTH.

Witnesses H. A. SANDBERG, E. G. WESTMAN.