US2252223A

US2252223A - Valve seat grinder stone carrier assembly

Info

Publication number: US2252223A
Application number: US391296A
Authority: US
Inventors: George M Walraven
Original assignee: Snap On Tools Corp
Current assignee: Snap On Inc
Priority date: 1941-05-01
Filing date: 1941-05-01
Publication date: 1941-08-12
Anticipated expiration: 1958-08-12

Description

Afi g. 12, 1941. s. M. WALRAVEN I 2,252,223

VALVE SEAT GRINDER STONE CARRIER ASSEMBLY Filed May 1, 1941 INVENTOR By George-M. alrzaven Q 4' 5 MZTTORATFIV Patented Aug. 12, 1941 VALVE SEAT GRINDER STQNE CARRIER V ASSEMBLY George M. Walraven, Snap-On Tools Kenosha, Wis, assignor to Corporation, Kenosh'a, Wis.

Application May 1, 1941, Serial No. 391,296 I 10 Claims. ((151-241) This invention relates to valve seat grinding machines and more particularly to valve seat grinder stone carriers, although certain features thereof may be employed with equal advantage for other purposes.

I It contemplates more especially the provision of a valve grinding stone carrier assembly having improved anti-friction and coacting means that are conducive to better operation, longer wear and increased adaptability.

Numerous types of valve grinding stone carrier assemblies have heretofore been proposed, but these have not proven entirely satisfactory from a functional standpoint. In assemblies of this type that involve anti-friction means such as ball bearings between the outer andinner sleeve, it is usually found that the inner sleeve that serves to receive the pilot, revolves with the outer sleeve'so that little or no effective purpose is served by the anti-friction means disposed therebetween. It is intended, therefore, to provide instrumentalities that prevent the inner sleeve;

from rotating relative to the pilot or guide.

One object of the present invention is to improve the construction and simplify the operation of devices of the character described.

Another object is to provide improved means for maintaining the inner and outer sleeves in relative rotation through the medium of antifriction bearings.

Still another object is to provide improved means for maintaining the inner sleeve of a valve grinding stone carrier, stationary'relative to the pilot or guide customarily used in conjunction therewith.

A further object is to provide improved friction engaging means between the inner sleeve and pilot of a valve grinding stone carrier assembly.

A still further object is to provide improved friction engaging means between the inner sleeve and pilot guide of a valve grinding stone carrier assembly.

Still a further object is to provide a novel combination of. friction and anti-friction means in a grinder stone carrier to insure relative rotation between the inner and outer sleeves thereof.

Other objects and advantages will appear from the following description of an illustrative embodiment of the present invention.

In the drawing: Figure 1 is a, perspective view of a driver having a driving knuckle in connection with a valve driving stone carrier embodying features of the present invention.

Figure 2 is a sectional view in elevation of a, valve 'grinding stone carrier embodying features of the present invention.

Figure. 3 is a view in elevation of a grinding stone, parts thereof being shown in section to clarify the illustration.

Figure 4 is a top plan view of a valve grinding stone carrier shown in Figure 2.

Figure 5 is a sectional view taken substantially along line VV of Figure 2.

Figure 6 is a sectional view taken substantially along line VI-VI of Figure 2.

Figure 7 is a fragmentary view in elevation of the upper portion of a pilot stem of the type adapted to be fitted in the valve stem bore preparatory to grinding a valve seat. The structure selected for illustration is illustrated in connection with a power driver It] that terminates in a polygonal knuckle ll having its sides converge to a point l2 so that its largest diameter is removed or spaced therefrom. The driver knuckle II is adapted to be telescopically received in -a correspondingly sized polygonal socket l3 broached or otherwise provided in a tubular tool holder cap it. The tool holder cap I4 is provided proximate the lower end thereof with a cylindrical surface l5 of somewhat smaller diameter than the larger exterior portion l6 thereof in order to present a peripheral portion IT. The cylindrical surface 15 with its shoulder l1 serves to receive an elongated tubular exterior sleeve I!) that is pressed or otherwise telescoped thereover for abutment with the periph eral shoulder l1. v

To this end, the inside diameter IQ of the outer sleeve [8 proximate to its upper portion corresponds with the. interior diameter of the cylindrical surface l5 to provide for a tight or pressed fit 'therebetween. To preclude any possible separation between the tubular cap I4 and the outer sleeve I8; a plurality of stud screws 20, in this instance three (Figure 5), are disposed radially through correspondingly threaded and aligned apertures 2 l22 provided inthe cap l4 and outer sleeve l8, respectively, along equidistant radii. This precludes anyseparation between the driving cap l4 and the outer sleeve l8 so that one will rotate responsive to the corresponding rotation of the driver knuckle l that is a complement of the socket I3.

As shown, the outer sleeve I8 extends downwardly to terminate in a reduced cylindrical tubular boss 23 which is exteriorly threaded as at 24 to mesh with corresponding threads 25 I provided in a metallic bushing 26 comprising the core of a grinding wheel 21. The reduced tubular boss 23 defines an exterior peripheral shoulder 28 disposed parallel to stepped interior peripheral surfaces 29-30, the latter being disposed somewhat lower than the former which merges with the inner cylindrical wall 3I of the outer sleeve I8. The cylindrical wall 3I of the outer sleeve I8 is of somewhat smaller diameter than the upper counterbore I5 thereof for snugly receiving the correspondingly sized cylindrical wall I5 of the tool holder cap I4, thereby presenting a peripheral shoulder 32 between the outer sleeve bore BI and its counterbore I5.

A ball bearing retainer disc 33 rests on the shoulder 32 within the counterbore I5 to presentan upraised axial projection 34 of comparatively smaller diameter than the inner bore 35 of the tool holder cap I4. This provides for ample space within which a coil spring 36 that envelope the upraised axial retainer disc projection 34 so as to support the disc 31 against the. peripheral shoulder 38 defined by a-driver'cap bore 35 which terminates in communication with the somewhat smaller vertical socket I3 therein. As shown, thespring supporting disc 3Thas a rounded peripheral exterior edge 39 topermit the tilting thereof as the spring 36is caused to yield responsive to pressure exertedyby the driver knuckle II thereon.

In order to center the driver knuckle II on the spring supporting disc 37, the latter is provided with an axial aperture 40 which is somewhat larger than. the tip I2 of the knuckle II for reception there'in. It should be observed that the axial boss 34' on the retainer disc 33 is inwardly recessed to provide the bore M for freely receiving the upper extremity 42of a pilot stem guide 43-. The pilot stem guide 43 may be of any suitable type and is intended for mounting in the valve stem bore of an internal combustion engine cylindrical head. The bore 4 I- is somewhat larger thanan internal bore 44'provided axially through an inner sleeve 45 that is intended for reception of the pilot stem 42- therein.

In order to enable relative free rotation with minimum friction between the outer sleeve I8 and the inner sleeve 45, anti-friction means such asstandard ball bearing raceways" 45 and 41 are interposed between the outer sleeve I8 and the inner sleeve 45. To this end, the inner sleeve 4'5is provided with a reduced annular extremity 4'8 defining a peripheral shoulder 49 for the reception of the upper raceway 46 thereon and' support the spring retainer disc 33in position. The lower raceway 41 is mounted on the stepped cylindrical interior surface 29 f the outer sleeve I8 for coaction with an angular seat 50 provided on the inner sleeve 45 proximate to the lower end thereof.

Ilhe angular seat ll=defines a peripheral shoulder 5| that serves to support the inner sleeve 45 on the lower raceway 4T so that the, outer sleeve i8 is rotatively and vertically supported through the ball'bearing raceways 46-41 through the medium of an inner sleeve 45 that establishes contact with the pilot stem 43 as will appear more fully hereinafter. The inner sleeve 45 terminates in a reduced cylindrical extension 52 that is freely received within the tubular boss 23' of the outer sleeve I8 50 that the pilot stem 43- will be guided entirely through the inner sleeve 45 without contact with theouter sleeve I8 or any portion thereof.

The pilot stem 43* is-usually held stationary within the valve stem bore comprising a part of the cylindrical head of an internal combustion engine. It is desired that the inner sleeve be maintained stationary with the stem 43 so that the outer sleeve I8 will be freely rotatable relative thereto through the medium of the anti-friction means such as ball bearing raceways 464'I. To insure that the inner sleeve 45 will be held stationary with the pilot stem 43, the inner sleeve 45 has an enlarged cylindrical boss 53 through which a plurality of spring impelled detents 54, in this instance three, are radially urged in communication with the external axial bore 44 of the inner sleeve 45.

The spring impelled detents 54 are, in this instance, of the ball type and are lodged in radial bores 55 provided in the enlarged peripheral boss 53 of the inner sleeve 45 along equi-spaced radii so as to project within the internal axial bore 44 of the inner sleeve 45. This is rendered possible by small apertures 56 which'ccnstitute the terminal end of the comparatively larger radial bores 55 at their point of communication with the axial inner sleeve bore 44. Springs 5T are provided in the radial bores 55 behind the ball detents 54 which urge them radially inward to project into the axial inner sleeve bore 44;

The-ball detents 54 and their springs 51 are maintained assembled in the bore 55 by means of discs 58 that are pressed to tightly engage the somewhat. larger counterbores 59 in axial communication with the radial bores 55. The spring impelled detents 54 will engage the pilot stem 43 and effect their relative frictional association and still permit the pilot stem 43 to be displaced axially relative to the inner sleeve 45 so that the outer sleeve assembly I8 may be telescopically displaced over and removed from the pilot stem 43 in that the detents 54 will yield to permit this engagement and disengagement.

So that the frictional engagement between the spring impelled detents 54' and the pilot stem 43 may be rendered more certain, should commercial practice so dictate, the pilot stem 43 may be provided with slight circular depressions 60 (Figure-7) that are equi-distantly spaced about a common circumference of the pilot stem 43 to render more positive the frictional engagement of the spring impelled detents 54.

In order to preclude accidental detachment between the driver knuckle II and the outer socket I3, the latter is provided with an annular groove GI proximate to the upper open edge 62 thereof to receive a split wire ring 63. The split wire ring 63 is of somewhat lesser diameter than the annular groove GI so that the inner circumferential edge thereof will lie within the exterior confines of the socket I3 with sufficient space in the annular groove 6| to permit the outward expansion of the ring 63. Consequently, the largest diameter of the driver knuckle will be somewhat greater than the normal inside diameter of the split wire ring 63 to cause the latter to expand responsive to the displacement of the driver knuckle I I therethrough for registry with the socket I3 when the driver knuckle tip !2 is within the axial aperture 45 of the spring supported disc 31.

In this position the larger diameter of the knuckle II will pass beyond the split ring 63 which will then contract to its normal diameter over the driver knuckle I I and preclude its accidental removal from the socket I3 and still permit its insertion therein without any appreciable difiiculty. This arrangement affords a simple and inexpensive spring retainer for the driver knuckle I i when it is in its operative position of full registry with the outer sleeve holder cap socket l3.

With the arrangement of parts above described,

simple and dependable expedients have been provided to maintain the driver knuckle l l in registry with the socket it against accidental displacement for positive rotation of the outer sleeve I8 relative to the inner sleeve 45 which is held imposition by the spring impelled detents 54 so that the anti-friction means such as the ball bearing raceways 46-41 will serve to support and rotate the outer sleeve I8 relative to the inner sleeve 45 which is in operative association with the pilot stem 43 during the valve grinding functioning of the Wheel 21.

Various changes may be made in the embodiment of the invention herein described without departing from the invention or sacrificing any of the advantages or features thereof, and nothing herein shall be construed as limitations upon the invention, its structural embodiment or concept as to the whole or any part thereof except as defined in the appended claims.

I claim:

1. In a device of the character described, the combination with an outer driving sleeve, a tubular pilot receiving sleeve concentrically disposed in said driving sleeve, anti-friction means interposed between said driving and pilot receiving sleeve, and friction engaging means in said pilot receiving sleeve projecting in the path of a pilot inserted therein to retain said pilot receiving sleeve stationary relative to said outer driving sleeve.

2. In a device of the character described, the combination with an outer driven sleeve, a tubular pilot receiving sleeve concentrically disposed in said driving sleeve, anti-friction means interposed between said driving and pilot receiving sleeve, and spring impelled friction engaging means in said pilot receiving sleeve projecting radially in the path of a pilot inserted therein to retain said pilot receiving sleeve stationary relative to said outer driving sleeve.

3. In a device of the character described, the combination with an outer driving sleeve, a tubular pilot receiving sleeve concentrically disposed in said driving sleeve, anti-friction means interposed between said driving and pilot receiving sleeve, and friction engaging means comprising spring impelled detents in said pilot receiving sleeve projecting in the path of a pilot inserted therein to retain said pilot receiving sleeve stationary relative to said outer driving sleeve.

4. In a device of the character described, the combination with an outer driving sleeve, a tubular pilot receiving sleeve concentrically disposed in said driving sleeve, anti-friction means interposed between said driving and pilot receiving sleeve, and a plurality of friction engaging means comprising spring impelled ball detents in said pilot receiving sleeve projecting in the path of a pilot inserted therein to retain said pilot receiving sleeve stationary relative to said outer driving sleeve.

5. In a device of the character described, the combination with an outer driving sleeve, a tubular pilot receiving sleeve concentrically disposed in said driving sleeve, anti-friction means interposed between said driving and pilot receiving sleeve, and a plurality of friction engaging means comprising spring impelled ball detents in said pilot receiving sleeve projecting radially in the path of a pilot inserted therein to retain said pilot receiving sleeve stationary relative to said outer driving sleeve.

6. In a device of the character described, the combination with an outer driving sleeve, said outer driving sleeve having a polygonal driver receiving socket, a tubular pilot receiving sleeve concentrically disposed in said driving sleeve, anti-friction means interposed between said driving and pilot receiving sleeve, and friction engaging means in said pilot receiving sleeve projecting in the path of a pilot inserted therein to retain said pilot receiving sleeve stationary relative to said outer driving sleeve.

7. In a device of the character described, the combination with an outer driving sleeve, said outer driving sleeve having a polygonal driver receiving socket, a tubular pilot receiving sleeve concentrically disposed in said driving sleeve, anti-friction means interposed between said driving and pilot receiving sleeve, and spring impelled friction engaging means in said pilot receiving sleeve projecting radially in the path of a pilot inserted therein to retain said pilot receiving sleeve stationary relative to said outer driving sleeve.

8. In a device of the character described, the combination with an outer driving sleeve, said outer driving sleeve having a polygonal driver receiving socket, a tubular pilot receiving sleeve concentrically disposed in said driving sleeve, anti-friction means interposed between said driving and pilot receiving sleeve, and friction engaging means comprising spring impelled detents in said pilot receiving sleeve projecting in the path of a pilot inserted therein to retain said pilot receiving sleeve stationary relative to said outer driving sleeve.

9. In a device of the character described, the combination with an outer driving sleeve, said outer driving sleeve having a polygonal driver receiving socket, a tubular pilot receiving sleeve concentrically disposed in said driving sleeve, anti-friction means interposed between said driving and pilot receiving sleeve, and a plurality of friction engaging means comprising spring impelled ball detents in said pilot receiving sleeve projecting in the path of a pilot inserted therein to retain said pilot receiving sleeve stationary relative to said outer driving sleeve.

10. In a device of the character described, the combination with an outer driving sleeve, said outer driving sleeve having a polygonal driver receiving socket, a tubular pilot receiving sleeve concentrically disposed in said driving sleeve, anti-friction means interposed between said driving and pilot receiving sleeve, and a plurality of friction engaging means comprising spring impelled ball detents in said pilot receiving sleeve projecting radially in the path of a pilot inserted therein to provide depressions confronting said friction means of said pilot receiving sleeve to render the latter stationary relative to said outer driving sleeve.

GEORGE M. WALRAV'EN.