US2104345A - Valve stem grinding and fitting device - Google Patents

Description

Jam M. HOLHUT ET AL 2,104,345

VALVE S'I EM GRINDING AND FITTING DEVICE Filed Sept. 16, 1936' 2 Sheets-Sheet 1 ATTORNEY.

Jan. 4, 1938. M. HOLHUT ET AL 2,104,345

' VALVE STEM GRINDING AND FITTING DEVICE Filed Sept. 16, 1936 2 Sheets-Sheet 2 1 4" q a, T i 14 '8 INVENTORS W/c/aae/ fla/hur.

ATTORN Patented Jan. 4, 1938 Michael l lolhut and Walter G. Vollmer, St. Louis,

Mo., assignors to H & H Machine 8; Motor Parts (30., St. Louis, Mo., a corporation of Missouri Application September 16, 1936, Serial No. 101,005

7 Glaims.

This invention relates generally to valve-stem grinding and fitting devices and, more particularly, to a certain new and useful improvement in devices especially adapted for gauging and grinding the tappet-engaging ends-of automobile valve-stems.

Our invention has for its primary object the provision of a device of the type stated so constructed for accurately gauging the length of automotive and other types of valve-stems and grinding the stems precisely to the desired length.

Our invention has for a further object the provision of a device of the type stated in which the desired valve-stem length may be precisely gauged and set directly upon the jig or fixture for valve-stem grinding,

Our invention has for another object the provision of a device of the kind and for the purpose stated, which is of simple structuradurable and emcient in operation, and rapid and conv venient in manipulation.

And with the above and other objects in view, our invention resides in the novel features of form, construction, arrangement, and combination of parts presently described and pointed out in the claims.

In the accompanying drawings (two sheets) Figure l. is a front elevational view of a valvestem gauge and grinder constructed in accord-. ance with our present invention;

Figure 2 is an end elevational view of the structure;

Figure 3 is a schematic sectional'view of the jig for gauging and holding the valve-stem for grinding operation, thejig being shown in position for stem gauging and setting relatively to the automotive valve-seat and tappet assembly;

Figure 4 is a side elevational view of the pilot gauge forming part of the present structure;

Figure 5 is an end elevational view of the jig shown in figure 3;

Figure 6 is a ltragmentary sectional view of the jig shown in Figures 3 and 5, taken approximately on the line 0-t, Figure 5;

Figure l is a fragmentary sectional view of the movable fixture of the valve-stem grinder, taken approximately along the line l'--l, Figure 2;

Figure 8 is a fragmentary sectional view of the movable fixture shown in Figure '7, taken approximately on the line t-8, Figure 7;

Figure 9 is a fragmentary end 'elevational view of the movable fixture shown in Figure 7, showingin particular a detail of the jig holding, memher of the fixture; and

Figure 10 is a partially broken perspective view of the jig shown in Figures 3 and 5, showing a valve-Stem in operative position therein.-

Referring now in more detail and by reference characters to the drawings, which illustrate a preferred embodiment of our present invention, the valve-stem grinder comprises a motor driven grinder wheel assembly A, a movable fixture B, and a valve-stem holding and gauging jig C for embracingly supporting an automotive cylinder valve D.

. The grinder wheel assembly A includes preferably an electric motor or other prime mover I mounted rigidly on a base 2 and operably connected through a manually or otherwise actuated switch 3 and a flexible electric conduit 4 in a conventional manner to a suitable source of power, not shown, the motor-shaft 5 being equipped at one projecting end with a face grinder or abrading wheel 6' and at its opposite projecting end with a second grinder or abrading wheel, wire brush, bufling wheel, or suitable or analogous member l.

Preferably integrally formed on the base 2, is a pair of suitably spaced upstanding bosses or standards 8 transversely apertured in registration for, and to which by set-screws 9 is secured, a shaft l0 disposed accurately in a line parallel to the axial line of the motor-shaft 5.

Shiftably mounted on shaft E0 in a manner and for a purpose presently described, is the movable fixture B, which comprises an upwardly presented body-section ll formed preferably integrally at its lower extremity with a longitudinally extending bottom-shell or housing l2 and at its upper extremity with a jig-holder l3, which latter, in turn, is formed with a first jig-engaging shoulder it provided in its upper face with an upwardly presented preferably serrated V- shaped recess, as at M, a circularly recessed second jig-supporting shoulder l5 likewise pro vided in its upper face with an upwardly presented annular recess, as at It, and intermediate the shoulders id, it, with an upstanding jigpositioning tongue 06, all as best seen in Figures 1 and T, the shoulders Hi, 85, being aligned perpendicularly to the true cutting plane of the face grinding wheel 6.

Forming part of, and disposed within, the shell or housing 92, is a pair of downwardly presented bosses ll, ll, having axially registering openings 58 for rotatably and shiftably engaging the shaft it, the housing 52 in its forward end-wall l9 being provided with an opening 20 axially aligned with the openings I8 for freely and loosely accommodating the housing for shiftable movement on the forwardly extended end-portion of the shaft l0. Formed in the opposite end wall 2| of housing l2 and also axially aligned with the openings I8, 20, and the shaft I0, is an internally threaded aperture 22 for adjustably receiving a fixture positioning-screw 23 abuttingly engageable at its inner extremity with the rear end of the shaft l0 and having at its outer extremity a knurled actuating-knob 24, a lock-nut 25 being preferably disposed about the screw 23 between the knob 24 and an outwardly facing shoulder 26 of the housing end-wall 2| for releasably retaining the screw 23 in adjusted position.

Suitably fixed on the shaft l0 within the housing I2 and positioned intermediate the standards H, H, is a collar 21, a helical spring 28 being coiled about and along the shaft II) for impinging at its opposite ends against the standard l1 and collar 21, as also best seen in Figure 7.

Preferably integrally formed on, and disposed centrally of, the opposite lower margins of the base shell or housing I2, are outwardly presented ears 29, 30, for engaging shoulders 3|, 32, respectively, upstanding from the base 2, as best seen in Figures 1 and 8, for limiting the rotative movement of the fixture B about the shaft l0.

Thus, it will be evident that the movable fixture B may be oscillated past the grinder wheel 6 in a plane parallel to a side face thereof from 'a position P to a position P", as shown in dotted lines in Figure 2, and may also be yieldingly shifted longitudinally upon and relatively to the fixed shaft ||l upon actuation of the positioningscrew 23, all for purposes presently more particularly appearing.

The valve-stem holding jig C comprises an outer, longitudinally split sleeve 33, which includes a valve-seating portion 34 and a stemholding portion 35 substantially diametrically reduced relatively to, and by an intermediate frustro-conical valve-seat engaging portion 36 joined to, the valve-seating portion 34, which latter is provided at its outer end with a precisely machined frustro-conical seating face 34' for engagement with the seating face of an automotive cylinder valve D, as best seen in Figure 10.

Longitudinally disposed in the sleeve-portion 34 and opening at an end to the seat 34, is a pair of preferably diametrically opposite pockets 31, retained in which by dog-pointed screws 38 are compression-springs 39. Precisely fitting for longitudinal slidable movement within the sleeve 33, is a split-tube 40 provided-adjacent its one or so-called upper end with a pair of diametrically opposed pins 4| projecting radially outwardly into the pockets 31 through slots 42 for impinging engagement with the respective inner ends of the springs 39 for normally urging the tube 40 inwardly or downwardly within the sleeve 34, the tube 40 being also provided at its lower end with an inwardly presented valve-stem positioning and supporting shoulder 43.

Extending radially through the wall of the sleeve-portion 35, is an enlarged slot or opening 44 juxtaposed to a recess 45 extending radially inwardly from the outer peripheral face of the tube 40 and dimensioned accurately to fit tongue IS, the slot or opening 44 being of such size that the recess 45 will always be accessible to the tongue |5 regardless of the relative shifting of the tube 40 within the sleeve 33, as best seen in Figure 3.

Similarly extending radially through the side wall of the sleeve portion 34, is an internally threaded opening 46, disposed in which is a manually operable set-screw 41 lockingly engageable with the tube 40 for a purpose presently de scribed.

Co-operable with the jig C for gauging and setting the valve-stem length in a manner presently set forth, is a gauge-rod 5| preferably of greater length than the distance from the face 34' to the engine tappet 52, as shown in Figure 3, the rod 5| being provided at its one extremity with a knurled knob 53 for facilitating manipulation and at its other extremity with a precisely machined tappet contacting foot 54. Preferably integrally and co-axially formed along the rod 5| at a precisely determined point for edgewise abutment with an end face 55 of the shoulder 43, as will be presently explained, is an enlarged cylindrical portion 56 accurately diametrically sized to fit snugly within the forward end of the tube 40 for positioning the gauge rod 5| axially within the jig C, as shown in Figure 3.

Also co-operable with the jig C for conjointly setting the jig C and the fixture B with respect to the grinder wheel 6, is a cylindrical pilotgauge 51, best seen in Figure 4, precisely machined in all its dimensions and faces to fit abuttingly against the face 55 of the shoulder 43 coaxially within the tube 40 of the jig C, the length of the gauge 51, as designated by the distance my in Figures 3 and 4, being exactly equal to the difference between the distance ac on the gauge rod 5| and the distance bd on the sleeve 33.

In setting the jig C for a valve grinding operation, the screw 41 is first loosened, so that the tube 40 and the sleeve 33 are free to slide relatively to each other, whereupon the springs 39, in their engagement with the pins 4|, will yieldingly shift the tube 40 longitudinally downwardly relatively to the sleeve 33, so that the tube-shoulder 43 is at the maximum axial distance from the valve-seat engaging face 34' on the sleeve 33. The gauge-rod 5| is then through the split 33' inserted co-axially in the jig C, so that the edge face of the portion 56 is in engagement with shoulder-face 55, whereupon the jig C is placed in a selected valve opening of the internal combustion engine being assembled or repaired and the tappet-engaging foot 54 set firmly against the face of the tappet 52, as best seen in Figure 3.

When the distance from shoulder 43 to the valve-seat engaging face 36, designated as the distance cb, is greatest, the valve-seat engaging face 36 will stand away from the valve-seat of the engine; thus the sleeve 33 must be manually urged downwardly-relatively to the tube 40 which is now held in a fixed position relatively to the tappet 52 by means of the gauge-rod 5|, the face 36 being thereby brought into tight, seated contact with the valve-seat of the engine, whereupon the screw 41 is tightened down against the tube 40, locking the tube 40 and sleeve 33 together in fixed relative position.

i In such manner, a fixed setting of the distance cb is obtained on the jig in correspondence with the distance ab, which represents the true distance from the tappet-face to the valve-seat and likewise represents the precise length to which the valve-stem must be ground.

The jig C is then removed from the engine, the gauge-rod 5| also removed, and the pilotgauge 51 inserted. As previously stated, the length xy of the pilot-gauge 51 is exactly equivalent to the difference between the distances ac and bd. Hence, it will be evident that the distance dz: is exactly equivalent to the distance ab.

The movable fixture B is oscillated in aicounterclockwise direction about the shaft III to the position indicated at P in Figure 2., The jig C, with the pilot-gauge 51 in position, is then placed in the jig-engaging shoulders ll, ii, of the fixture B, so that the-tongue I8 thereof will fit into the recess 45 of the jig. The lock-nut 25 of the fixture B is loosened and the screw 23 rotated in the proper direction, thereby translating the fixture B longitudinally along the shaft l0 either toward or away from the face of the grinding wheel 6, as the case may be, until the end face 58 of the pilot-gauge 51 is approximately in the plane of the face of the grinder'wheel 6. The fixture B is then pivoted about the shaft in in a clockwise direction until the entire jig C is in front of the face of the grinder wheel 6, as shown at P in Figure 2, whereupon the screw 23 of the fixture B is carefully turned to bring the end face 58 of the pilot-gauge 51 into accurate abutment with the face of the grinder wheel 6, the lock-nut 25 being then tightened down on the locking shoulder 26 and the fixture 3 thus set tin the desired position, it being obvious that the distance from the face 34' of the jig C to the face of the grinder wheel 6 will exactly equal the true length to which the valve-stem D must be ground in order to snugly fit the selected valv chamber;

With the fixture B and Jig C thus positioned, the jig C is lifted out of the fixture, the pilotgauge 5? removed, and the valve D inserted and manually held in such manner that the seating face of the valve is tightly pressed against the face 3% of the sleeve 33 and the stem is coaxially held within the tube ill upon the shoulder 43. The jig C, thus carrying the valve D, is placed in the fixture B, as above described, the

recess 35 of the jig C being brought into positioning engagement with the tongue it of the fixture B. The grinder wheel 5 is set into motion and the entire jig-fixture assembly rotated back and forth around the shaft it], thus bringing the tappet-engaging foot 5d of the valve-stem D into grinding contact with the grinder wheel 6 until the foot of the valve-stem will just clear the face of the grinder wheel 8. The valve then will have been ground precisely and accurately to the desired length and may be removed from the jig for installation and assembly into the engine.

By our present invention, we thus provide an emcient device or structure in which valve-stems may be more economically, more speedily, and more accurately ground than has heretofore been possible, so far as we are aware, since the valveholding jig C is set directly from the valve chamber to be accommodated, thus avoiding the timewasting and error-producing operations of calipering the valve chamber and transferring the caliper measurement to avalve-stem holder. il-he structure is relatively simple in structure, may be inexpensively constructed, the number of machined interfitting parts being materially reduced, with a consequent reduction in the costs of, and the number of possibilities for error in, machining, is durable and convenient in operative manipulation, and is efficient in the performance of itsintehded functions.

It will be understood that changes and modifications in the form, construction, arrangement, and combination of the several parts of the device or structure may be made and substituted for those herein shown and described without departing from the nature and principle of our present invention.

Having thus described our invention, whatwe claim and desire to secure by Letters Patent is:--

'1. In a valve-stem grinding andfitting device, in combination, a valve-stem holding jig comprising a sleeve, 9, tube longitudinally shiftable within the sleeve, the sleeve and tube being arranged co-operatively for receiving a valvestem and the sleeve having valve and valve-seat engaging faces, and means for securing the sleeve adiustably to the tube.

' 2. In a valve-stem grinding and fittingdevice,

in combination, a valve-stem holding jig comprising a sleeve, a tube longitudinally shiftable within the sleeve, the sleeve and tube being arranged cooperatively for receiving a valve-stem and the sleeve having valve and valve-seat engaging faces,

a valve-stem supporting shoulder in the 'tube, and means for releasably locking the sleeve to the tube.

3. In a valve-stem grinding and fitting device, in combination, a valve-stem holding jig comprising a sleeve, a tube longitudinally shiftable within the sleeve, the sleeve and tube being arranged co-operatively for receiving a valve-stem and the sleeve having a valve and valve-seat engaging faces, resilientmeans operatively disposed in the sleeve engageable with the tube for normally urging the tube longitudinally in a predetermined direction within the sleeve, and means for releasably locking the sleeve to the tube.

4. In a valve-stem grinding and fitting device, in combination, a base, a face abrasive disc mounted for rotation on the base, a unitary frame swingably mounted on said base for movement in a plane parallel to the face abrasive disc, said frame having integrally formed forward and rearward aligned jig-supporting yokes, and an integrally formed upstanding reference shoulder positioned intermediate of, and in alignment with, said yokes, and a removable valve-stem holding jig operatively mountable in said yokes and having a transverse reference slot precisely engageable with the reference shoulder for positioning the jig longitudinally with respect to the frame for supporting a valve-stem for endwise engagement with the face of the abrasive disc.

5. In a valve-stem grinding and fitting device, in combination, a valve-stem holding jig comprising a sleeve, a tube longitudinally shift able within the sleeve, the sleeve and tube being arranged co-operatively for receiving a valve-stem and the sleeve having valve and valve-seat engaging faces, a pair of diametrically opposed longitudinally extending recesses formed in the sleeve, a pair of diametrically opposed radially outwardly extending pins rigidly mounted-in the tube for shiftable disposition within the sleeve recesses, and spring means disposed in each of the recesses in engagement with the pin for normally urging the tube toward a predetermined position with respect to the sleeve.

6. In a valve-stem grinding and fitting device, in combination, a valve-stem holding jig comprising a sleeve, a tube longitudinally shiftable within the sleeve, the sleeve and tube being arranged co-operatively for receiving a valve-stem and the sleeve having valve and valve-seat engaging faces, a pair of diametrically opposed longitudinally extending recesses formed in the sleeve, a pair of diametrically opposed radially outwardly extending pins rigidly mounted in the tube for shiftable disposition within the sleeve recesses, spring means disposed in each of the recesses in engagement with the pin for normally urging the tube toward a predetermined position with respect to the sleeve, and means threadedly disposed in each of the sleeve recesses engageable with the spring means for adjustably varying the tension thereof.

7. In a valve-stem grinding and fitting device, in combination, a base, a face abrasive disc mounted for rotation on the base, a pair of upstanding bosses formed on the base and aligned at right angles to the face abrasive disc, a shaft mounted rigidly in and extending longiframe along the shaft to any predetermined posi- 10 tion of adjustment.

MICHAEL HOLHUT. WALTER G. VOLIMER.

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