US1154159A - Bit for valve-grinders. - Google Patents

Description

A. ASHWORTH. BH' FOR VALVE GRINDERS.

APPLICATICN FILEDJULY 12. 1915.

1 154 1 59, Patented. Sept. 21, 1915.

' @wumdoz zevemem; upon shewn in my e1" valve preserves e 'eressure upen V we mlve set 51eriz ee velve; the 1!? Features and .1 e 'i iez'th ans.

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valve i Tam -f5 l me ewey and shewing evec'z fem 01"- held- "wejeetien i'hereon 'Te. Fig. 2 A and. racks Vera views. s frame mesh-re ism and p0 en with the 11 persion of iihe bracket and a threaded 9 and l? reveiubly mounted. The 331151- i n 1'5 has eh Gene 18 en eeeh si le thereof Y ing out from the heed 1i and has the siet extending; lengthwise 01" the ee; ire portion.

e'i said to receiveehereein'eugh the suppereing extension en the brackets 26 Yrljeh fi', *hin ssi sle; A. x ghumb screw weshee 28 is meeheem the 0f the extension 25 in a threefled hole t0 drew breekeie 26 rigidly was: side ef the 23 en each side of he sie'efie.

The ehumbeerew 27 permits the quick adjustment of the make 2-6 any esired. we: eleng the 310:5 The bracket 26 has the central opening 33 therein and the (moss- Wiee greeves 29 in the eppesiee walls of said 89 opening 33, suitable lugs exeenfiing eut each side he greeves 23 fie held the reeks loeseiy and slidebly in line in the greeves 29 dueing their reciprocative mogement,

In order toateciprocefiy turn the valve 39, g e spindle is provided in the bracket 26, being leesely mounted through hale 31 in the Fewer portion of the bracket. A tin-eatie52 epenin'g 32 is provided theough up- 1111?; 3e fits Within the threaded opening am? has the k nut 35 thereon fer holding i' firefly in the adjussed position. The nut 3e has a central ieng shwise hole pel'mit the spindle 30 to slide Vertically therein. A pinion 36 is attachedto the spindle 3% Within the opening 33 in bracket and n'aeehes loose}? in the racks 22 at each sie, A tenslo c011 spnng 37 1s prevzaeci between the upper of ehepinien and 1e Lojler 100 end of the nut 3% ice give he fiesirefi pressum on the valve 39. The nut 13 0f eient length 30 be eurned ii ogening 32 anci thereby glw dew tensien to the spring 3? yes spindle 30 to be menuefiy infuse ega'wer time the pinion escapee eeeve the teeth I thereby permiiting fr e siee. Wise movement of the nmcke; 26 we s efie loose support of the pinion 3G in racks and the spindle 30 in the bracket 26 permits said spindle to adjust ltself to any movement or inequality of the valve 39 in grinding the same. This is a flexible movement which is essential to the quick and perfect grinding of the surface of said valve.

The spindle 30 is preferably provided with a flat end 38 having a centering point 40. A spanner bit 41 is preferably provided for the flattened spindle end 38, having a slot 42 in the stem to receive said-flattened end 38, said slot having preferably an opening 43 at the center of its lower wall for the centering point 40, which arrangement prevents the sidewise movement of the flattened end 38 out of the slot 42. The spanner bit 41 is provided on its lower surface with two projecting tapered points 44 a spaced distance from the center thereof and on opposite sides of the fiat disk-shaped head The points 44 are preferably made by screws inserted through threaded openings in the head. Said head 45 has also the rounded projection 46 central thereof to bear on the center of the valve 39. The valve 39 is provided with spaced holes 47 which are deeper than the length of the spaced pins 44 so that they cannot bottom in said holes 47 when the central projection 46 bears on the top of the valve 3,9. 'lhevalve 39 rests on the seat 48 on the engine cylinder 49; valve stem 50 extending dnwn through the hole 51 in said cylinder. i

In order to grind the valve 39 and valve seat 48, the surfaces therebetween are coated with an alorading compound. The gear 16 may be power driven but is preferably manually rotated by means of the crank 52. When said pinion 17 is so rotated with the machine in position upon the valve 39, it is apparent that a reciprocating movement will be; given to the racks 22 by the crank shaft formed by the earns 18 and pins 19 with rings 20 around said cams, thereby giving a reciprocal rotation to the pinion 36 and the spindle 30 attached therethrough and the spanner bit 41 and valve 39. The loose mounting of the spindle 30 permits the spanner 41 to adapt itself to the movement of the valve 39 as it turns backward and forward, the pins 44 turning the valve 39 yet not bottoming in the holes 47 thereby keepthe.

ing constant central pressure on the curved central downward projection 46 on the cen ter of the valve 39. This arrangement permits the quick removal of the spanner bit 41 and the driving mechanism therefor, yet is thoroughly adaptive to any irregular movement of the valve 39, and can be adjusted to any degree of tension sd as to obtain a perfectly smooth ground surface on the valve 39 and valve seat 48.

. 1 claim as new:

1. A valve grinder comprising frame, a spindle rotatively mounted in said frame, mechanism to rotatively reciprocate said spindle in said frame, a disk shaped spanner bit having a central opening rem ovably engaged by said spindle, and a central projection on the end of said spindle to bear against the center of said spanner bit in said opening when reciprocally rotating the same.

2. A valve grinder comprising a frame, a spindle rotatively mounted on said frame, mechanism to rotatively reciprocate said spindle, a disk-shaped bit end on said spindle for engaging the valve, projections on said disk-shaped bit for engaging in spaced openings in the valve to turn said valve, and a curved projection central of said disk to bear on the center of said valve during the process of grmdmg.

3. A valve grinder comprising a frame, a spindle rotatively mounted on said frame, mechanlsm to rotatlvely reciprocate said spindle, a flattened endto said spindle hav- I ing a central projection, a spanner bit having spaced projections thereon to engage in similarly spaced openings in the valve, said spanner bit having a slotted stem with a central openingtherein to receive said flat 'spindle end and the central projection of, said spindle in said slot and central openand a central rounded projection on the lower side of said tlpdto bear continuously on the center of the valve top during the grinding of said valve. In testimony whereef I have affixed-my signature in the presence-of two witnesses.

ASA ASHWORTH. I

\Vitnesses: v I

H. A. SANDBERG, HAROLD FonsBERG.

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