US1114809A - Grinding or polishing machine. - Google Patents

Description

W. V. ROBINSON. GRINDING 0R POLISHINQMAOHINB.

APPLIUATION FILED MAY 31, 1913. I 1,1 14,809. Patented Oct. 27,'1914.

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A 227/5 601/ Wl fam 74- a www W. V. ROBINSON. GRINDING 0R POLISHING MACHINE.

APPLICATION FILED MAY 31,1913.

Patented Oct. 27,' 1914.

2 SHEETS-SHEET 2.

WILLIAM V. ROBINSON, OF DETROIT, MICHIGAN.

GRINDING R POLISHING MACHIN.

Specication of Letters Patent.

4Patented oct. 27, 191i.

Application led May 31. 1913. Serial No. 770,969.

`reference being had therein to t-he accompanying drawings.

My invention relates to grinding or pol ishing machines. I

The invention resides in the novel means for effecting a proper, relative movement between the grinder or polisher and the article to be operated on; in the means for effecting an automatic, relative adjustment between the work and the grinder or polisher; in the producing of a structure in which the grinder or polisher is driven at a uniform speed and also the relative movement between the grinder or polisher and the Work is uniform; in the relation and construction of the traveling; carriage and frame; in a device for retaining the work in proper relation to the grinder and in a means for avoiding over grinding of the edges or extremities of the work; further in certain constructions, arrangements and combinations ot' parts as will more fully hereinafter appear.

In order that the invention may be better understood I Will show and describe the same as embodied in a machine ot the tvpe l parts, though I do not desire to limit niv i protection to the particular device illus` t'ated.

In the drawings,lt`igure l is u perspective View of the machine einliodving niv in vention; Fig. 2 is a side elevation thereot; and Fig. 3 is an end elevation. litiga. ll and 5 are views at right angles illustrating the work container; Figs. t3, T and o illustrahi certain details of construction; and liig. l) in section 1 latter and the trame t) are preferablyT formed i of angle iron. The .sides l@ ol the 'trame (l i form tracks i'or the wheels l oi the carriage G which is adz'ipted to support the Work. The members t) and (l are mounted for travel at right angles to each other and the work' therefore, 1s mounted to be moved longitudinally upon the traveling of one of the carriages, and to move laterally upon the actuation of the other carriage.

H is a, grinder positioned in operative relation to the work-support G, and as the work in the device illustrated is adjusted in relation to the grinder by the actuation of the carriages, the grinder is held stationary, as far as lateral and longitudinal movement is concerned.

The frame C is reciprocated backward and forward upon the track B and this reciprocation is continuous and the reversing ell'ected automatically. Thus, mounted in a suitable bearing I in the main frame is a shaft J driven through the medium of a pulley K. Sccurcd to the shaft J is a sprocket L which is connected bv means of a chain M with a second sprocket N carried upon a shaft O that is mounted in a suitable hearing as I on the main iframe. The bearings I and l are fixed in relation to the main frame and the shaftv l is continuously driven.

Q is a member depending from thc frame` C and provided with an elongated. verti cally-arrunged` Islot li within which is positioned a projerticn or pin t5 attached to the chain )if liv this arrangement, when the pin ti is passing intermediate the sprorkets and below the same, the l'rame C will be moved in one direction, and when the pin passes between the sprockets at the top thereof. the traine will be moved in the opposite direction. "lhc pin is ofcourse, so arranged to freely pass around the proeiiets, and tlul slot lt will allow the pin to pass from beneath the sprockets to there- During the longitudinal rimiprocation of the trame C the Polisher or grinder will operate upon the work longitudinally thereol. 'l`hcretore, when the, work reaches the limit ol its longitudinal travel, the carriage (i is moved a given distance laterally, and preferably this lateral shifting of the car riage (i is accomplished at both limitsl of the longitudinal travel of the iframe C. AS shown, the n'iemhcr (s has secured to the bottom 'tare thercol a rari: 'l provided with two series ol teeth ll V, adapted to be engagi-lbv a dog IV pivoted at X to a support Y on the trame (l. Suitably connected to the carriage (i .is a cable A adapted to be wound upon a drum B iixed to a shaft C in the frame C.

D is a second cable xedly connected to the shaft C and having a weight E tending to lrotate the shaft in a direction to wind up the cable A and move the worksupport G toward the shaft C. However, when the dog N is in engagement with the teeth -on the rack-bar, it will hold the carriage G against actuation through the medium of the cable A. The dog W is actuated in one direction when the frame C reaches the inward limit of its movement, and in the opposite direction when this frame is at its outward limit, and the teeth U and V are arranged in alternate relation so that the movement of the dog will release the same from its engagement with one of the series of teeth or racks and permit the carriage G t0 be moved laterally by the cable A a slight distance before the dog engages with the teeth on the other rack. By spacing the teeth on the rack, any suitable lateral .movement of the carriage C may be provided.

Preferably the dog W is actuated through the medium of a sliding rod G having its inner end pivotally connected at H to the dog W and having its outer end carrying a downwardlyextending arm I which 'is adapted to engage a trip J when the frame C reaches its outward limit of movement,

and to contact with a second trip K at the inward limit ofthe frame (1. The trips J and K are so arranged that they will engage the arm l slightly in advance of the limit of travel of the carriage G, so as to arrest movement of the rod G" before the limit of movement of the carriage is reached, thereby causing-.a shifting of the dog. relative to the racks, as the carriage continues to its limit of travel.

The grinder or polisher H is herein shown as of circular form and is mounted upon a shalt L carried bv a frame M ivotallv secured to a shaft N', journaled in supports or standards O in the main frame. The shalt li 1s driven from the shaft N through the medium of pulleys P Q," and belt R.

The shaft N forms the main drive shaft.

and the shaft J is'actuatcd therefrom by step-down drive trains Rl 't5 and a drive train R, as will be readily apparent upon reference to Fig. 2. The frame lvl is connected to the outer end of a member S which is fulcrumed intermediate its ends upon a suitable support T on the main frame, and has its other end4 attachedto a' counter-weight U, the counterweights serving to olf-set to the desired degree the weight of the grinder or polisher.

lt is desirable to provide means for raising the grinder'out of engagement with the work. and I therefore, attach the frame lV by means of a connection 2V to a lever W.

This lever is fulcrumed at X to a support Y on the main frame and the outer end of this lever engages an elongated eye Z in a rod A2 attached to the main frame. The eye Z, as will be apparent upon reference to Fig. 3, will permit movement of the lever W in a direction to raise the frame M. but

this loop is so arranged that it will limit,

the upward movement of the outer end of the lever W `and therefore,` limit the movement of the grinder or polisher toward the work. rlhe grinder or polisher is however, free to raise. Tov allow of adjusting the distance of the grinder from the carriage G the connection V is preferably provided with a suitable turn-buckle C2. D? D4 are cooperating catches for holding the lever W in its adjusted position when it-has been moved to raise the frame M.

In the operation of the device heretofore described, the work is placed upon the carriage G andthe latter movedvto the outward limit of its lateral movement, or away from the shaft Cthe dog lV engaging the rackbar and preventing return of the support G. The frame C is then arranged at one limit of its longitudinal reciprocation and power applied to the shaft R, which will drive the grinder or polisher and also actuate the chain M. During the travel of the frame C along the track B a longitudinal strip of the work will be polished equal to the width of the work surface of the member H. Then the frame C reaches the limit of its movement the carriage G will be shifted laterally and during the travel of the frame (l in the opposite direction the member H will polish another longitudinal strip. The lateral shifting of the carriage G is of course, so proportioned that all parts of the surface of the work. will be acted upon by the grinder or polisher. Furthermore it is to be noted that the grinder is driven at a constant rate of speed and that all parts of the work are acted upon by the grinder or polisher for the same length of time. This insures uniform grinding of the surface being worked upon.

ln polishing or grinding certain articles, particularly where there are movable parts, l find it desirable to provide means forA retaining the work in desired relation to the table. This is especially so in grinding or polishing stove tops where the lids are in place. rPhe retainer may be of various constructions but in Fig. '1,1 have illustrated a device of novel construction and which is particularly adapted for this purpose. Thus D2 is a stove top having the usual lids, E2 and F? is the. retaining member, in the form of a carriage G2 provided at opposite ends with rollers H2 adapted to engage the work and having their axes at right angles `lo the tfavel of the carriage G upon the frame C. Theretainer F2 is attached to a tures N2 in the cross-bar.

Vmember I2 extending transversely of the carriage G and spaced from the upper face thereof.

J2 K2 are supports iixedly connected t', the traveling frame C at opposite en'ds thereof and to the upper ends of which the member I2 is attached. The carriage G2 is so connected to the member I2 as to be yieldinglyheld in engagement with the Work. This is preferably accomplished by attaching the member G2 to the cross-bar or member I2 by means of headed bolts L2 M2 lixedly secured to the member I2 and having their upper ends slidably engaging aper- This allows thev carriage G2 to move vertically, and the apertures N2 are of sufficient size to permit the carriage to have a slight longitudinal tilting. O2 is a leaf-spring serving to yieldably press the member (lf2-downward, or in a direction to engage the Work. One end ot this spring is connected to the bottom face ot' the cross-bar I2 as by means of rivets P2,

and the opposite end lrests .upon the top of the member G2 and is slotted at Q2 R2 to receive the bolts L2 M2. Preferably two of these retainers are employed, and the cross-bars carrying the same are arranged upon opposite sides of but in, proximity to the grinder or polisher H land therefore, the work is yieldably held in engagement with the inember G at points upon opposite sides of the grinder, preventing accidental tilting ot the Work during the grinding or polishing operation.

' When the Wheel H reaches the edges of the Work, if the edge travels beyond the vertical plane4 passing through the center of the wheel, the latter will drop down a slight distance, sufficient ,to grind oit the edge as a. 'lo avoid this, means is provided which will prevent the member H from dropping over the edges. Preferably this is accomplished by arranging guards Z c at the opposite limits of longitudinal travel of the Wheel H in relation to the Work-support and attaching to the carriage M a shoe d having inclined or cam laces e f adapted to engage respectively the guards b c. The latter are formed of members each having one end attaclied to one of the sides E of the carriage C and having its upper end terminating in a laterally-extending flange g. In order to properly adjust the shoe d in relation to the work upon the support, the shoe is adjustably connected to the frame M as by means of screws 7L engaging elongated slots z' in the shoe. By the arrangement just described, when the member H reachesJ the edge a, the portion c will engage the flange g Vand prevent the grinder from dropping down. Similarly vvlien the grinder reaches the inner edge of thework theportion f Will engage the memberc. The member D is of course, so adjusted that .when the portions e f are in engagement with the `flanges gA to engage the latter slightly in advance of` the limit of rccipi'ocation of said carriage.

2. In a grinder or polislier, the combination with a frame, of a carriage arranged thereon for reciprocation, a support mounted on said carriage, means tending to move said support .in 'one direction, means for effecting a step-by-step movement of the support in said direction,4 an operating member for said means arranged upon said carriage, and trips acting-upon said operating member at the opposite limits of reciprocatien of said carriage.

3. -In a grinder or polisher,`tlie combina-V tion with a support, an "operating member positioned in operative relation to the support, a lever, a connection between said lever and said frame, and means coopera ting with said member to limit the Irevenient of the member toward the support.

.4. In a grinder or polislier, the combination with a work-support, an operatingv Inember positioned in operative relation to the support, and means iiidepend ent of the work support positioned in proximity to said operating member for preventing accidental movement of the Work relative thereto. i

5. In a grinder or polislier, the combination with a Work-support, an operating member positioned in operative relation to lthe support, and means extending over the carriage, and means connected to said crossbar for exerting a yielding pressure upon the work.

7. In a grinder or iolisher, the combination wvith a support, oi a carriage over which soA said support is adapted to move, an operating member positioned in operative relation tothe support, cross-bars carried by the car-.

riage and arranged upon opposite sides of the work-operating member and in proX- imity to the path of movement thereof, and yielding means carried by said cross-bars for exerting a pressure upon the Work.

8. In a grinder or polisher, the combination with a support,of a carriage over which said support is adapted to move, an operating member positioned`in operative relation to the support, members .extending ap- Wardly from the carriage at opposite ends of the support, a cross-bar connecting said members, a roll connected to said cross-bar for vertical play, and a spring attached to the cross-bar and adapted to exert a pressure on said roll in the direction of the support.

9. In a grinder or polisher, the combination With a work-support, of a member for operating upon the Work adapted to move toward the carriage, means for reciprocating the carriage, and means forlimiting the movement of said'member toward the Work at a predetermined point in the travel of said carriage.

10. In a grinder or polisher, the combination with a Work-support, of a member for operating lupon the Work adapted to move toward the'carriage, means for reciprocating the carriage, and means for limiting the movement of said member toward the Work at one limit of reciprocation of said carriage.

11. In a grinder or polisher, the combinationwvith a work-support, of a member for operating upon the Work adapted to move toward the carriage, means for reciprocating the carriage, and means for limiting the movement of said member toward the Work at the opposite limits of reciprocation of vsaid carriage.

12. In a grinder or polisher, the combination with a reciprocatingv carriage, of a member for operating upon the Work on the carriage, adapted to move toward the carriage, a guard arranged at one end of the carriage, and a shoe operatively attached to said member for engaging said guard at a predetermined point in the travel of said carriage'.

13. In a grinder or polisher, the combination with a reciprocating carriage, of a frame adapted to rock toward the Work, a Work-operating member carried by said frame, guards arranged at opposite ends of.

tion with a Work support of means independent of the Work support for yieldably pressing the Work toward the support.

15. In a grinder or polisher, the combination with the Work support of a traveling carriage for carrying said Work support, and means on said carriage for yieldably pressing the Word toward the support.

16. .In a grinder or polisher, the combination with a support, an operating member positioned in operative relation to the support, a lever, a rod attached to said frame, and coperating catches respectively on said rod and lever to limit the movement of the member toward the support.

17. In a 'grinder or polisher, the combination with a reciprocating carriage, of a transversely-moving Work-support, a member for operating upon the work, and means for limiting the transverse movement of said Work-support at a predetermined point in the travel of said carriage. L

18. In a grinder or polisher, the combination with a reciprocating carriage, of a transversely-moving Work-support, a mem-v ber for operating upon the work, a lever, an adjustable connection between said `lever and said support, and meansl coperatmg With said carriage to limit the transverse move` ment of the support. I 1

19. In a grinder or polisher, the combina-I tion with a frame having a track, a carriage having Wheels mounted thereon, said carriage being provided With a track at substantially right angles to the first-mentioned track, a Work-support having Wheels mounted upon said carriage track, automatic means for continuously reciprocating said carriage, and means for automatically effecting a step-byLstep movement of the support at each stroke.

In testimony whereof I aflix my signature in presence of tWo Witnesses.

VILLIAM V. ROBINSON. "Witnesses:

IVM. J. BELKNAP, JAMES P. BARRY.'

soi

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