US441139A - Journal-bearing for emery grinding-machines - Google Patents

Description

(N0 Modelfl G. G. .OROWELL. I JOURNAL BEARING FOR EMERY GRINDING MAGEHI'NJB S. No. 441,139;

Patented-Nov. 25, 1 890.

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citizen of the United States, residing at Cin To all whom, it may concern.-

UNITED STATES Gnoner: o. onowicnn, or (liYClNNA'lL onto.

JOUIRNAL-BEARING'FOR EMERY GRINDING-,MACHINE'S.

I SPECIFICATION forming part of Letters Patent No. 441,139, datedNovember 25,1890.

Application filed September 25,1889. Serial No. 327,084. (llo morleh I Be it known that I, GEoRoE'G. CRoWELL, a

cinnati, in the county of Hamilton and State of Ohio, have invented a certain newiand, useful Improvement in J our'nal-Bearings for Emery Grinding-lllachines, of which the-following is a specification.

-My invention relates to the improvement of that class of emery grinding or, buffing machineswherein one or morelemery or bufi-' ingwheels are mounted upon a shaft supported from a suitable frame and has particular relation to the means of supporting said shaft.

.Heretoforeit has been. customary to support the grinding-whel-carryirig shaft in bearing-boxesupon theupper ends of rigid arms, which extend upwardly from the frame top or bed-plate. This method of holding or supporting the shaft has features which in some classes -of work are objectionable for nstancefln case the wheel should be of such unequal-density'as to throw it out of running balance from theinequ'ality in weight or from'the wearing away of the-softer portions of the wheel, or from other causes. 1 In case these imperfections exist and the ordi nary rigid support for the shaft is used, many imperfections in the work will result, among surface on the article ground.

The objects of myinvention are to which will be the production of an untrue overcome these imperfections, as will be herein-p after'fully set forth.

' "Referring to the drawings, forming a part -of this specification, Figure '1 is a view in perspectiveof an emery grinding-machine, and Fig. '2 1s a view in cross-section of the wheel-shaft, showing the shaft-support in ele-. vati'on.

- Similarletters refer to similar parts through:

out the several views.

My invention consists of volute springs arranged'in the manner hereinafter specified to form supports for the wheel-shaft.

The main frame of the machineconsists, as usual, of a suitable bedplate a, and legs I).

manner with slots 0, which are formed therein in 'lines parallel with the sides and ends;

(I re presents the gri riding-wheel shaft ,which is supported longitudinally above the bed;

plate and which carries in the usual manner one or more emery-wheels e. The shaft d at points on opposite sides of its center bears and runs in suitable metallic bearing-boxes f, which may be of the usual form. ,Each of these boxes is connectedby bolts with one.

end of a volute spring The remaining and lower end of the volute spring is connect ed With-the upper side of the bed-plate. This latter connect-ion is preferably made by bolts :i,'1nade to pass through a longitudinal slot- 70,. formed in the lower inturned end of tho spring. The heads of these bolts serve to bind-the spring firmly against the bed-plate.

The usual rigid shaft-supporting standards are omitted from the machine and the volute springs above described allowed to support, as shown, the shaft and its wheels, The tension of these springs is such as to normally hold the shaft in correct horizontal alignment-with the bed-plate.

" The usual form of adjustable rests-for the support of the work to be ground orpolished may be used in connection with the machine,

the rests; consisting of standards having in, turned feet and pins or bolts extending downwardly from "said feet through the bed-plate slot'c. I v

, In 'orderto equalize thespring-power' of ening ribs thereon. I

The spring-power of the supports may be varied by setting the. bolts 2' at different points in theslot 70.

The herein-described volut-e spring not *only serves as a support for the shaft-boxes,

but permits the shaft and boxesto vibrate sufficiently to equalize the force evolved by the emery or bad wheel in motion, causing said wheels and theirshaft to run on their centers of gravity andat the same time afford a milder resistance to the'force applied in grinding or buffing various articles; The spring character given by the volute springs to the shaft and the wheels thereon will result in the same degree of resistance offered. bythe wheel regardless of the angle or point the'supports throughout their length, I may, i .if found necessary, thicken the lower portion of the springs or form strengthening or stifion the periphery of said wheels at which said force is applied.

Another object attained by the use of the springhercin shown and. described lies in the fact that in case one side of the wheel is being used or subjected ,topressure the same resistance is offered at any point on said wheel side equidistant from any point on the periphery. It is obvious, however, that this result might be obtained by surrounding the shaft with coiled springs and allowing the same to form lateral bearings for the wheels,

or by other similar means.

I am aware of Patent No. 387,238, in which .volute springs are used to suspend shafting, and therefore'do not claim, broadly, this construction.

Having now fully described my invention,

what I claim, and desire to secure by Letters Patent, is- In journal-bearings for emery grinding-machines, a frame, and a wheel-carrying shaft above said frame, volute springs rising from said frame, said springs supporting the shaft, as described, and having slots in their lower end portions, and 'bolts passing through said slots and connecting the springs and frame, substantialiy as described.

GEO. G. CRQWELL.

y In presence of v BARTON GRIFFITH,

JOHN FRAVEL.

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