US2285377A - Surfacing machine - Google Patents

Description

'June 2, I942. c. INMAN 2,285,377

SURFAC ING MACHINE Filed June 27, 1959 4 sh'eets-sheei 1 June 2, 1942. J, c, INMAN sunmcme MACHINE Filed June 27, 1939 4 Sheets-Sheet '2 ITLUEH't-UI' June 1942. J. c. INMAN 2,285,377

SURFAC ING MACHINE Filed June 27, 1939 4'Sheets-She et 3 Patented June 2, 1942 mer e rarest orriacs SURFACING MACHINE John Clarence Inman, Windsor, Ontario, Canada, assignor to Lempco Products, 1110., Bedford, Ohio, a corporation of Ohio Application June 27, 1939, Serial No. 281,425

20 Claims. (01. 51151) My invention relates to improvements in surfacing machines for surfacing or resurfacing the gasket engaging faces of cylinder heads or blocks, the faces of clutch pressure plates, and other surfaces which it is desired to grind true.

An object of my invention is to devise a machine which will hold the Work, a surface of which is to be ground, exerting pressure thereon to press it down against an abrasive plate and move it over such plate to effect the grinding operation.

A further object is to devise a machine which will impart to the work combined longitudinal and lateral movement so that the path travelled by any point in the work will be in the form of a figure eight for each cycle of movement.

And a still further object is to provide means, in the case where the machine is to be used for grinding the surfaces of clutch pressure plates, whereby in addition to the figure eight movement a progressive rotary motion will be imparted to the work.

With the, above and other objects in View which will hereinafter appear as the specifica- 0 tion proceeds, my invention, in its preferred embodiment, consists in the construction and arrangement hereinafter more particularly described and illustrated in the accompanying drawings in which:

Fig. 1 represents a side view of the machine with the near side removed to expose the drive and abrasiveplate to view.

Fig. 2 is a plan view thereof.

Fig. 3 is an inverted sectional plan view taken on the line 3-3 (Fig. 1).

Fig. 4 is an enlarged end elevational view, showing the mechanism for imparting the lateral movement to the work (in this case a cylinder head) illustrated in dotted lines.

Fig. 5 is a similarly enlarged plan View of the mechanism shown in Fig. 4.

Fig. 6 is an end elevational detail (drawn to a slightly larger scale than Figs. 1 and 2) illustrating the mechanismfor imparting progressive rotary motion to the work.

Fig. '7 is 'a horizontal section taken on the line 'l'! (Fig. 6).

Fig. 8 is a horizontal section taken on the line 8--8 (Fi 6).

Fig. 9 is asim'ilar section to that shown in Fig. 8 only illustrating the parts in different positions. v

Fig. 10 is an enlarged inverted plan view of the set'screws 24.

the mechanism for imparting progressive rotary 'motion to the work, and

Fig. 11 is an enlarged/vertical section taken through the line II'H (Fig. 7).

Like characters of reference indicate corresponding'parts in the difierent views of the drawings.

Where the machine is tobe used for surfacing or resurfacing clutch pressure plates the mechanism for imparting progressive rotary motion to the work is. incorporated thereinto as well as the mechanism for imparting the figure eight movements whereas Where the machine is intended for use for grinding cylinder heads'or blocks only the mechanism for imparting the figure eight movements is employed and the mechanism for imparting progressive rotary motion to the work is omitted.

I will first describe the machine which includes all the mechanism necessary to surface or resurface a cylinder head or block.

A table [2 is provided having a planary top 13 preferably covered by a sheet of resilient material 14 such as sponge rubber. The abrasive 1 plate l5 rests on the sheet l4 and may assume the form described and claimed in my co-pending application Serial No. 279,890, filed June 19-, 1939, for improvements in Cylinder head and. block surfacing'plates in which the plate is covered by aband of abrasive material such as emery cloth.

Upwardly extending flanges 16 are provided- '7 on the table l2 to properly position the abrasive plate I5.

The mechanism for imparting the figure eight movements to the' work, whether clutch pres sure plate or cylinder head or block, comprises spaced apart slide rods ll longitudinally disposed under the table top and supported at their" ends in spaced relation thereto in the depending brackets l8. rods I! and standards 20 extend upwardly from the sides of the slide at the sides of the table.

Blocks 2! having depending sockets 22 receive the upper portions of the standards 20' and have spaced laterally disposed slide rods 23 extending transversely fromblock to block,

said blocks being vertically adjustable onthe standards and held in any adjusted position by 23, said slide having an aperture 26 therethrough.

extending to the vicinity of one end.- thereof, which aperture terminates at its inner end in A slide 19 is reciprocable on the a throat 21 of reduced width. An upwardly directed extension 28 is provided on the slide 25 in the vicinity of itsend remote from the aperture 26, said extension and throat 21 being preferably located on the longitudinal centre line of the slide. A bracket 28 provided at one end with a socket 30 located over the aperture 26 has its other end provided with a longitudinal slot 31 adapted to receive the flattened upper end 32 of a pin 33 which extends down freely through the extension 28 and slide 25 and protrudes below the latter through a double armed member 34 which is held thereon by a nut 35 threaded onto the lower end of such pin 33, said pin being a driving fit in the member 34. bracket 29 is held on the upper end of the pin 33 by a bolt 36 threaded thereinto.

The socket 38 on the bracket 29 has a vertical spindle 31 threaded therethrough and extending downwardly into the vicinity of the work. The lower end of the spindle is provided with a stiff spiral spring 38 which, at its lower extremity, carries a flanged member 39 provided with a hardened steel point 40 adapted to engage the work A or B (illustrated in dotted lines in Figs. 4 and as a cylinder headand in full lines in Figs. 1 and 2 as a clutch pressure plate). A look nut 4| is provided on the spindle 3? adapted to engage the upper end of the socket 3i] and the upper end of such spindle terminates in. a knob 42 for facilitating rotation thereof.

The double armed member 34 provided with opposed arms 43 having longitudinal slots 44 The.

nuts 68.

therethrough is provided with an extension 45 extending inwardly substantially perpendicularly to the arms. Such extension carries at its free extremity an upwardly directed pin 45 adapted to extend up through the throat 21 in the slide aperture 26 and protrude thereabove. A pawl 41 pivoted on the upper end of the pin 46 is adapted to engage a ratchet wheel 48 rotatably mounted on the slide 25 between the extension 28 and the throat 21, said pawl being spring held against the ratchet wheel bya spring 49, one end of which is attached to the upper end of the pin 45 and the other end to the pawl. An additional spring-held detent 58 similar to the above pawl and spring is provided on the slide 25 engageable with the ratchet wheel 48 to prevent retrograde rotation thereof when the pawl 41 is ratcheting as will hereinafter appear.

A crank 5! curved to escape the spindle 31 is pivoted at one end by a stud 52 to the ratchet wheel 48 in the vicinity of its periphery and at its opposite end by a bolt 53 to a clamp adjustably mounted on the slide rods 23, said clamp comprising upper and lower members 54, 55 secured together by the bolt'53 upon the lower end of which a nut 56 is threaded.

Where the machine is used for ri d g y der heads, for instance, headed studs 51 extend down through the slots 44 in the arms 43 of the The slide I 5 is reciprocated by any suitable mechanism and prime mover as, for instance, by an electric motor 6| attached to a bed 62 which may be clamped to the slide rods H, the motor having an armature shaft pulley 63 connected by a belt 64 to a shaft pulley 65 of a reduction gear 65 mounted beneath the top of the table [2 and which includes a power take-01f crank 61 pivotally connected at .its free end to one end of a link 68 which is pivotally connected at its other end to the slide IS.

The mechanism as above described is all that is required for imparting the necessary movement to cylinder heads and blocks to surface or resurface their gasket engaging faces. Where, however, the machine is to be used for grinding the face of a clutch pressure plate the latter is held in position relatively to the actuating mechanism by other means which will hereinafter be described and in addition to the figure eight motion of the work to be ground means is provided for progressively rotating the clutch pressure plate.

Instead of the studs 51 which are not used, a member 69, as illustrated'a forked member, is attached .to the double armed member 34 by headed bolts 18 extending through the slots 44 into the free extremities of the legs of the member 69, said latter member straddling the extension 45 but positioned below the same.

At the junction of the legs of the member 69 an orifice H is provided to receive loosely the head 12 of a stud 73 of a chuck employed to hold the clutch pressure plate in position while grinding its face. Such loose connection between-the chuck stud and member 69 constitutes a pivotal connection enabling the chuck and attached work to align itself with the abrasive plate. Such chuck may be of any orthodox form and as illustrated consists of a cylindrical casing 74 having radial jaw guideways 1-5 in its bottom adapted to receive the outwardly movable jaws 16 disposed therein, said jaws adapted to extend through orifices in the casing side wall and to engage the inner periphery of the clutch pressure plate which is designated as A. The upper faces of the jaws T8 are provided with transverse curved teeth 11 inserted into a spiral rack 18 on the lower face of a disc I9 disposed concentrically in t e cas n said disc having radially disposed teeth 88 in its upper surface engageable with pinions 8| on horizontal stubs 82 journalled in the casing side wall and extending to the exterior face thereof. The outer ends of the stubs are of socket form to receive a key (not shown). A flanged plate 83 fits inside the casing 14 above the disc 19 and has notches 84 in its flange which straddle the reduced portions 82a of the stubs 82 to prevent the latter being displaced inwardly or outwardly. The flanged plate 83 has a depending central boss 85 resting on the bottom of the chuck casing. The hereinbefore mentioned stud 13 is disposed axially of the chuck by being mounted on a cover plate 86 which is secured to the wall of casing 14 by the screws 81. The cover plate is of greater diameter than the casing and its periphery is provided with a toothed rack 88.

A depending stud 89 is provided on the slide 25 by having its upper" end inserted into an orifree 88 therein and held in place by a set screw rack 88 by a spiral spring 93 attached at one end to the pawl and at the other end to the stud.

In order to provide longer jaws in the case where the inner periphery of the clutch pressure plate or ring is of excessive diameter, as illustrated in Figure 10 the jaws 16 may have extensible portions 16a secured to the jaws proper by screws 94.

I will now describe the operation of my machine in so far as the grinding of a cylinder head is concerned, reference being had particularly to Figs. 4 and 5 of the drawings, it being understood that the clutch pressure plate holding chuck and the means for supporting it and rotating it have been removed.

The abrasive plate as illustrated or any other suitable form of abrasive plate is placed in position on the table 12 as shown and the cylinder head designated by B is placed thereon, the slide 25 and its attached mechanism having previously been raised on the standards sufficiently to enable the abrasive plate and cylinder head to be placed in position. The slide and its attached mechanism are now lowered until the studs 51, having been suitably adjusted in the slots 44, are inserted into the bolt holes in the cylinder head B. The set screws 24 are then screwed in to lock the blocks 2| on the standards. By loosening the clamps for the crank 5| the cylinder head and the slide 25 can be suitably adjusted for proper lateral centering, the clamp for the crank 5! being then tightened on the slide rods 23. Subsequently the spindle 31 is screwed down in the socket by the knob 42 until the hardened point 40 engages the upper surface of the cylinder head and the spring 38 exerts sumcient pressure thereon to press the surface to be ground of the cylinder head against the abrasive plate.

The electric motor 5| is then switched on and through the medium of the pulleys 63 and 65 and belt 64 the reduction gearing 36 is operated and its crank 6! is rotated with the result that the longitudinal slide I9 is reciprocated by the crank connected link 68. As the work to be ground, i. e., the cylinder head B is connected to the longitudinal slide l9 through the standards 20, lateral slide rods 23, lateral slide 25, double armed member 34 and studs 51 on its arms 43, the work is reciprocated longitudinally upon the reciprocation of the longitudinal slide I9.

Simultaneously during each longitudinal reciprocation the work is also moved laterally, this occurring upon the longitudinal movement of the work in the direction indicated by the arrow X in Fig. 5. Owing to the lag of the work due to the friction of its surface to be ground on the abrasive plate and the pressure exerted by the spring 38, such work tends to turn about a point underlying the pivot pin 33 in the direction of the arrow Y in Fig. 5. This is due to the 01T- setting of the pivot pin 33 from the longitudinal centre line of the work. As this occurs the member 34 attached to the work swings in the same direction until the stud engages a side wall of the throat 21 which limits such swinging movement. During such swing the pawl 41 on the stud 45 engaging the ratchet wheel 48 rotates the same in a counter-clockwise direction and actuates the crank 5| with the result that the slide 25 and attached work is moved laterally.

During the longitudinal movement of the work in the reverse direction to that indicated by the arrow X in Fig. 5, the work tends to turn in the reverse direction to that indicated by the arrow Y in Fig. 5 with the result that the member 34 is swung back in such direction until the stud 45 engages the opposite side wall of the throat 21. During such swing the pawl merely ratchets on the ratchet wheel 48 and no lateral movement is imparted to the lateral slide 25 and therefore to the work.

The result of such combined longitudinal and lateral movement of the work including the swing thereof is that any point of the work will during a complete cycle of such movements describe a figure eight path. Owing to the fact that on each longitudinal reciprocation of the work the lateral movement thereof is comparatively small it will take several longitudinal reciprocations for the work to travel completely across the abrasive plate in either direction. Thus successive figure eight paths described by any point in the work will not register but will be progressively positioned across such plate.

Consequently owing to the combined movements imparted to the work as its surface is ground against the abrasive plate, such ground surface will be in a true plane.

In the case where it is desired to grind the surface of a clutch pressure plate A as illustrated in Figs. 1 and 2 the studs 51 are not used and the clutch pressure plate holding mechanism above described is employed. In so far as the combined longitudinal and lateral movements imparted to the work by the slides l9 and 25 are concerned these are identical to the above case in which the cylinder head surface is ground but, in addition, the clutch pressure plate is progressively rotated. Each time the clutch pressure plate A commences its longitudinal stroke in the direction of the arrow X in Fig. 5 owing to the lag of the work and the offsetting of the pivot pin 33 the member 34 is turned in the direction of the arrow Y as above described with the result that the relative position of the lateral. slide 25 and clutch pressure plate holding chuck are altered, the slide 25 being advanced with respect to the chuck. As the pawl 92 is positioned on the slide 25, during such lag of the work and the chuck the pawl 92 engaging the rack 88 on the chuck will turn the chuck a limited extent and consequently equivalently rotate the clutch pressure plate. On the reverse longitudinal stroke the pawl 92 merely ratchets on the rack. The disposition of the parts of the mechanism effecting such operations are shown in Figs. 8 and 9 wherein the latter figure illustrates the relative movement of member 34 and chuck to effect the turning of the latter and the former figure shows their relative positions on the reverse longitudinal stroke.

.What I claim as my invention is:

1. In a machine for truing plane surfaces on cylinder heads and blocks and on clutch pressure plates, the combination with an abrasive surface upon which the work to be ground rests, of a longitudinally reciprocable slide, means for reciprocating the slide, means attached to the slide for holding the work pivotally from a point offset from its longitudinal centre line, said work reciprocating longitudinally on the abrasive surface with the longitudinal reciprocation of the slide, and means for moving the work laterally on the abrasive surface during each cycle of longitudinal reciprocation thereof.

2. In a machine for truing plane surfaces on cylinder heads and blocks and on clutch pressure plates, the combination with an abrasive surface upon which the work to be ground rests, of a longitudinally reciprocable slide, means for reciprocating the slide, means attached to the slide for holding the work pivotally from a point offset from its longitudinal centre line, said work reciprocating longitudinally on the abrasive surface with the longitudinal reciprocation of the slide, and means actuated by the swinging of the workabout the pivot point at the beginning of one stroke in the cycle of longitudinal reciprocation for moving the work laterally on the abrasive surface.

3. A machine as claimed in claim 2 wherein the means for moving the work laterally comprises a laterally movable slide to which the work is pivotally connected, means for mounting the lateral slide on the longitudinally reciprocable slide, and means attached to the mounting means and the lateral slide for actuating the latter upon the swinging of the work about its pivot point in one direction.

4. A machine as claimed in claim 1 wherein means is provided for progressively rotating the work during each cycle of longitudinal reciprocation thereof, said means being actuated by the swinging of the work about its pivot point in one direction.

5. In a machine for truing plane surfaces on cylinder heads and blocks and on clutch pressure plates, the combination with an abrasive surface upon which the work to be ground rests, of a longitudinally reciprocable slide, means for reciprocating the slide, means attached to the slide for holding the work pivotally from a point oiiset from its longitudinal centre line, said work reciprocating longitudinally on the abrasive surface with the longitudinal reciprocation of the slide, means actuated by the swinging of the work about the pivot point at the beginning of one stroke in the cycle of longitudinal reciprocation for moving the work laterally on the abrasive surface, and means for progressively rotating the work simultaneously with each lateral movement thereof on the abrasive surface.

6. A machine as claimed in claim 2 wherein the means for moving the work laterally comprises a laterally movable slide to which the work is pivotally connected, means for mounting the lateral slide on the longitudinally reciprocable slide, means attached to the mounting means and the lateral slide for actuating the latter upon the swinging of the work about its pivot point in one direction, a rotatable chuck incorporated in the work holding meansfor attaching the work thereto, and means on the lateral slide for progitudinal slide, a double armed member pivotally connected to the lateral slide, means for attaching the work to the double armed member in such position that its longitudinal centre line is offset laterally from the pivot of such double armed member for permitting the work to swing a limited extent at the beginning of each stroke of the longitudinal slide, and a crank pivoted on said lateral slide mounting means and operatively connected to the lateral slide for actuating the lateral slide and move the attached work laterally at the beginning of one stroke of the longitudinal slide.

8. A machine for truing planesurfaces on cylinder heads and blocks and on clutch pressure plates comprising a table, an abrasive surface on said table upon which the work rests, a longitudinally movable slideon said table, means for reciprocating said slide, a laterally movable slide, means for mounting the lateral slide on said longitudinal slide, a double armed member pivotally connected to the lateral slide, means for attaching the work to the double armed member in such position that its longitudinal centre line is offset laterally from the pivot of such double armed member for permitting the work to swing a limited extent at the beginning of each stroke of the longitudinal slide, a crank pivoted on said lateral slide mounting means and operatively connected to the lateral slide for actuating the lateral slide and move the attached work laterally at the beginning of one stroke of the longitudinal slide, and resilient means on the lateral slide for exerting pressure on the work for pressing it against the abrasive surface.

9. A machine as claimed in claim 7 wherein the lateral slide has a slot therethrough, and the double armed member has a lateral extension, and a stud on the extension extending into the slot for limiting the swing of the double armed member and the attached work.

10. A machine as claimed in claim 7 wherein the lateral slide has a slot therethrough, and the double armed member has a lateral extension, a stud on the extension extending into the slot for limiting the swing of the double armed member and the attached work, a ratchet wheel rotatably mounted on the slide, one end of the crank being pivotally connectedto the ratchet wheel in the vicinity of its periphery, and a spring-held pawl on the stud engageable with the ratchet wheel.

11. A machine as claimed in claim 8 wherein the means on the lateral slide for exerting pressure on the work comprises a bracket pivotally connected to the lateral slide and including a socket on its free end, a vertical spindle threaded through the socket, a spring on the lower end of the spindle, and a pointed member on the spring adapted to engage the work.

12. A machine as claimed in claim 8 wherein a pivot pin extends through the slide for pivotally mounting the double armed member thereon, said pin being non-rotatable in the member, a bracket non-rotatably mounted at one end on the pivot pin and including a socket on its free end, a vertical spindle threaded through the socket, a spring on the lower end of the spindle, and a pointed member on the spring adapted to engage the work.

13. A machine as claimed in claim 7 wherein the means for attaching the work to the double armed member comprises a forked member, the legs of which are secured to the arms of the double armed member, a rotatable chuck attached to the work and rotatably mounted on the forked member, and means in the lateral slide for progressively rotating the chuck at each reciprocation of the longitudinal slide and attached work.

14. A machine as claimed in claim 7 wherein the means for attaching the work to the double armed member comprises a forked member, the legs of which are secured to the arms of the double armed member, a rotatable chuck attached to the work and rotatably mounted on the stroke, movable means for moving said work laterall throughout a cycle of reciprocations, and a member carried by said work and moving said movable means at each pivotal movement of said work.

16. In a machine for truing plane surfaces on cylinder heads and blocks and on clutch pressure plates, the combination with a base and an abrasive surface supported thereby, of means for holding the Work to be ground in grinding position on said surface, means for reciprocating such work relative to said base and longitudinally upon said surface, said reciprocating means including means movable laterally relative to said reciprocating means and connecting said work to said reciprocating means, coacting means carried by said laterally movable means and said reciprocating means and operative upon each longitudinal reciprocation to impart lateral movement to said work relative to said base, whereby said work is moved progressively across said surface in a lateral direction upon successive cycles of longitudinal reciprocation, and means for simultaneously and progressively rotating said work upon said surface upon successive cycles of reciprocation thereof.

1'7. In a machine for truing plane surfaces on cylinder heads and blocks and on clutch pressure plates, the combination with a base and an abrasive surface supported thereby, of means for holding the work to be ground in a grinding position on said surface, means for reciprocating said work relative to said base and longitudinally upon said surface, said reciprocating means including means movable laterally relative to said reciprocating means,'offset pivotal meansconmeeting said work to said laterally movable means to permit oscillatory movement of said work in each cycle of reciprocation thereof, and co-acting means carried by said offset means, said laterally movable means and said reciprocating means and operative upon the oscillatory movement of said work in at least one direction to move said laterally movable means and said work laterally 'of said surface.

13. Th machine of claim 17, and said co-acting means includingmeans for continuing said lateral movementof said work in a step-by-step manner throughout a pluralit of cycles of reciprocation of said work. 1 i

19. The machine of claim 1'7, and additional co-acting means carried by said offset means and said reciprocating means and operative autoimparting step-by-step rotation to said article throughout said cycle of reciprocations.

' JOHN CLARENCE INMAN.

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