US1757175A - Grinding machine - Google Patents

Description

May 6, 1930. I v o. DOYIUTT 1,757,175

GRINDING MACHINE Filed Sept. '7, 1927 a Sheets-Sheet 1 May 6, 1930. 7 DOUTT 1,757,175

GRINDING MACHINE Filed Sept. 7, 192'? 6 Sheets-Sheet 2 o. DOUTT 1,757,175

GRINDING MACHINE Filed Sept, 7, 1927 6 Sheets-Sheet 5 May 6, 1930. Y

0. DOUTT GRINDING MACHINE Maya, 1930.

6 Sheets-Sheet 6 Filed Sept. 7, 1927 Patented May 6, 1930 UNITED STATES; PA T OFFICE ownn DOUTT, on DETROIT, MICHIGAN, 'AssI'eNoR, BY, MESNE ASSIGNMENTS, 'ro GEN- ERAL SPRING BUMPERCOBPORATION, A CORPORATION OF MICHIGAN eninnme MACHINE Application.filed september 7, 1927.1Seria1 Nb. 217,951.;

This invention relates to grinders and more particularly to the provision of a machine for grinding, polishing or buffing bars having curved surfaces such as the bars used in making up vehicle bumpers. In the following description and inthe claims the term grinding, is intended to' include polishing and butting since it will be apparent that by merely applying an element of suitableabrasive'qualities to my machine any oneiof these operations may beperformedthereon.

An object of the invention-is to provide a grinding for curved bars which will be adapt-- ed to grind thereon a surface having asub stantially constant radius of curvature. Fur- Further and more limited objectswillbe apparent from the drawings and description, and from the use of articles including the combinations of elements defined "in the claims. V

Drawings Of the several drawings Figs. 1 and 2 show aside elevation and plan view, respectively,,of my grinder; F1g.'3 repr esents a sectional view taken on line 33 of Fig. 2'a11d Fig.4 a front elevation of the grinder; Fig.

5 shows an enlarged detailed viewof a portion of the mechanism for adjusting the height of the shelf upon which the feed wheel is supported; Fig. 6 is an enlarged detailed front elevation of the grinding element and feed wheel and Fig.7 isa side elevation of the same; Fig. 8 is a front fractional View of the lower portion ofthe feed wheel and the upper portion of the grinding element;

. Fig. 9 is a section through the center of the feed wheel; Fig. 10is a detailed fractional view of the mechanism for regulating the pressure applied to the bars; Figs. 11, 12 and 13 show a side elevation, 21. plan View and an end elevation, respectively, of a shelf adapted ingmechanism thereforg g to" support the feed wheel shaft'aiid-the Description Upon the. base;1 are mounted standards 2, 3, 4 and 5,the motor 6"and the removable bearing support 7. A grinding'or polishing element 8, of suitable abrasive'materi'al, is fixed tothe shaft9 which is rotated by the motor 6 and supported onbearings carried by'thesupport and jthestandards '2, 3, 4;

and-,5. a

The bar feeding "drive'mechanism is sup a ported as a unit upon the shelf 10, said shelf having a laterally projecting portion 11 extending-between the standards 3 and 4' from which longitudinalprojections 12 and 13 eX-' tend between standards 2 and 3 andstandards 4 and 5,',respect ively. The shelf lO and its projecting portions providebearingsurfaces upon thestandards 2, 3, land 5 and is adapted to slide up and downt-hereon. The thread ed shafts .14, 14 areffixed to the projecting p'ortions'1 2 and 13' and adapted to support the shelf 10. These shafts pass through blocks 15,15'within each of which a gear 16, threaded to fit the threads of the shafts 14, is rotatably retained, as more clearly shown in Fig. 5. The shaft 17 has fixed thereto worm gears-18, 18 adapted to rotate with said shaft and,'by means of the gears 16,16 and the shafts 14, 14, to raise and lower the shelf 10. The-handwheel lfi is fixed to the shaft l? to facilitate the turning of the same. The plate 20,, fixed to the'shelf 10, together with the plate 21 (Fig. 2) provide an extended bearing surface upon; the standard 2, to prevent binding of the surfaces adapted to slide upon the several standards. 7

The motor 22 is mounted on the shelf 10 and, through thetransmission 23, drives the shaft 24.' The gear is fixed to the shaft 24 and said shaft,through the gear 25 and the idle gear 26, drives the ring thes haft;28.

The feed wheel 29 is fixed to the shaft 28 for rotation therewith but may be removed from the end of that shaft and replaced by other feed means to handle bars of a different curvature or straight bars. This wheel is gear 27, keyed to 33. The nuts 36 on the rods 33 -andthe springs 37, between them and theplates35, exert the desired yieldable pressure uponthe shield 32; The I0(l '38,: connected'tdthe. end portion of the upper; rod 33 and the" upper plate 35 by means of an L shaped plate 39, is supported from the base 1 and serves to prevent rotationi'of the shield-32 with'the shaft 28. The; shield 32 hasa V shaped portion 40 cutout to permit contact between the bar be ing ground and the surface of' the grinding lementi8. Y i v a 3 ;In orderthat variations in'the'thickness of thefbarsbeing ground may be allowedfor and a uniform product may'result from I grinding bars of uneven thickness throughout their length, the resiliently supported wedges 41 are adapted to press against and support the portions of the bars intermediatethe ends of the same. Asis clearly shownin FigJlO, the wedge 41 has at its inner end a pin 42. The screw 43 is threaded into the wheel 29 and it, with the spring 44 between the pin 42 J and 'thea'djacent end of the screw 43, exert an adjustable yielding pressure against the wedge 41. The slanting surfaceiof-the recess 45, cooperating with the slanting surface of the'wedge 41,- limits the outward movement of the'latter.

' Operation) I A grinding, polishing, orbufling element8,

of the desired abrasivequalities, is fixed upon shaft 9 for rotation therewith; -Afeedwheel 29, ofsuitable diameter and configuration to receive the bars 31, is fixed tothe shaft 28 for rotation therewith and a shield 32, of suitable configuration, is resiliently mounted upon the shaft 28. The shelf 10 is lowered until the desired contact is had between the bars 31 on the feed wheel and the grinding element 8,

and the support 38 for the shelf 32 may be put in place. The grinding element and the feed a wheel are then rotated in; the same direction (clockwise) and apair ofbars aresupplied to the recesses in the-feed wheel as shown in Fig. 6. The shield 32 will yield resiliently'to the outward pressure from the surface of the bars 31 and will serve-to hold'them, in place against the whet-"3129.-

.By varying the pressure at the screws 43 and by;varying the distance between the feed w eeli29 n L egri d n l m n i th desiredpressure upon the bars may be obtained.

The resiliently mounted wedges 41 will compensate for irregularities in the bars and, by an increase of pressure due to increased compression of the springs 44, will cause greater grindingat the thicker portion of the bar and 7 thereby yield a bar of more nearly uniform thickness. i

It is apparent that the particular means shownifor holding the bars inplace on the wheel 29 are. not essential to my invention. It is also apparent that other driving and supporting means might be used without avoiding scope of the invention and it is not intended to hereby limit the invention to the particular embodiment herein shown and described. 7. f V It is intended that a pair of barsshould be applied to ,the .same'sectionof the periphery ofthe feed wheel atone time but one or more than two maybe supplied if such operr.

' Having thus describ d my'invention, what I claim is: l i

. 1. Ina machine for a v the combination witha rotary grinding element, of'afeed wheel having; recesses in its periphery for ,therec eption of the end portionsof bars'to be ground, and means for regulating the pressure applied to the intermediate portions fof the bars, saidJmeansineluding resiliently supported plates adapted to press upon the inner surfaces of the bars, and a segmental guide member having the same curvature as said wheel, resiliently held adjacent the outer periphery of said wheel and cooperating with said wheel to hold the bars thereon.

2. In a grinder the combination with a grinding element, a rotary feed wheel adapted to supply the workto the grinding element, means for carrying said work upon the periphery of said feed wheel, said means includingrecesses onthe peripheral surface adapted to receive the end portions of the work, and a guide adapted to bear -upon the outer surface of the work, said guide being resiliently and radially supported from a member arranged in concentric relation to the 7 center of the feed wheel.

3. In a machine for grindingcurved bars, the combination with a grinding element, of a shelf movably mounted relative to said grinding element, a rotatable shaft carried by said shelf, a feed wheel mounted on said shaft, means for supporting bars on the periphery of said wheel including means for engaging the ends of the bars on said wheel, and a guide memberyieldingly supported from saidshaft and of a curvature corresponding to the curvature 'of said wheel, said grinding curved bars,

guide member cooperating with the means on said wheel tohold the work'thereon, said guide having. a cut-out portion on its outer periphery into which the grinding element bars on said wheel, and a channeled guide member of the same curvature as said wheel, and in which the wheelrotates, said guide being yieldably supported from said shaft and spring means in the periphery of'said wheel for yieldably pressing the bars against said guide member.

5. In a machine for grinding curved bars, a base member, a rotary grinding element mounted on said base member, upstanding guide posts secured to said base, a shelf member slidably supported on said guide posts, a

shaft journaled on said shelf, a feed wheel carried by said shaft and rotatable in the machine, the combination of means adapted to retain the. ends of articles to be ground .or buffed, and resiliently actuated means intermediate the: ends of said articles for resisting movements thereof toward said wheel.

9. In a feed wheel for simultanenously supplying a plurality of curved bars to a grindmeans for holding said bars adjacent the periphery of said wheel, of resiliently actuated meansfor resisting movement of said bars toward said periphery, said resisting means operating separately on each bar,

10. In a feed wheel fora grinding or buffing machine, thecombination with means for retaining bars upon the surface of said wheel, of 'ad ustabIy resilient means for resisting movement of said bars toward said wheel,'said resisting means comprising rests resiliently supported from" a base adj ustablymounted in said wheel, and means for Varying the compression of the resilient support for said rest. 1 In testimony whereof, I hereunto affix my OWEN DOUTT.

signature. I

plane of said grinding element, means for supporting the barsto be ground on the periphery of said wheel including notches for the reception of the ends of said bars on said wheel, spring pressed members arranged in the periphery of said wheel and a guide member cooperating with the means on said wheel,

said guide being ofchannel cross section in WhlCll the said wheel revolves, sa d guide being of a curvature corresponding to the circumference of the wheel and encasing the same for a material distance against which the bars are yieldingly pressed, said uide'being supported by means extending from the said shaft, means extending from said base to prevent rotation of said guide on said shaft, and means for adjusting said shelf relative to said grinding element.

6. In a grinding machine for curved bar having eyes at their ends, the'combination with a rotary grinding element, of a rotary feed wheel having recesses in its periphery into which the eyes of the bars may be received, and resilient means for holding the bars onto said feed wheel, said means including spring means for urging said bar toward said wheel, and spring means for opposing said first spring means. V

7. In a grinding machine for curved bars, the combination with a rotary grinding element, of a rotary feed wheel the periphery of which has the same curvature as the bars to be ground, means on the periphery of said feed wheel for engaging the ends of said bars, spring means for engaging said bars to urge them toward said feed wheel, and spring means on the periphery of said wheel against which said bars are yieldingl held.

8. In afeed wheel for a grinding or ufling ing or buffing machine, the combination with I

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