US1001430A - Device for dressing grinding-wheels. - Google Patents

Description

S. W. NESBITT.

DEVICE FOR DRESSING GRINDING WHEELS.

APPLICATION FILED APR. 16, 1910.

Patentd Aug. 22, 1911.

mini/V705, Smad W 11 165223 WITNESSES.- 6P1) :4 TTORNL'Y.

Cir

SAMUEL l/V. NESBITT, OF SPRINGFIELD, MASSACHUSETTS.

DEVICE FOR DRESSING GRINDING-WHEELS.

oonaso.

Specification of Letters Patent. Patented Aug, 2,2, 1911.

Application filed April 16, 1910. Serial No. 555,958.

To all whom it may concern:

Be it known that I, SAMUEL WV. Nnsnrr'r, a citizen of the United States of i-Mncrica, and resident of Springfield, in the county of Hampden and State of hlassachusetts, have invented certain new and useful Improve meats in Devices for Dressing GrindinglVheels, of which the following is a full, clear, and exact description.

The object of this invention is to produce a device for simultaneously dressing the working faces of opposed cup shaped grinding wheels.

In certain special machinery a pair of grinding wheels are provided which are rotatable on arbors therefor which are axially coincident and which grinding wheels are movable, the one relatively to the other on the line of their common axis so that the working faces of the cup shaped grinding wheels may simultaneously finish, by grinding, the opposite faces of any given piece of work, such, for instance, as a wrench bar forging.

In the carrying out of this invention a device is provided which consists of a holder and a pair of rotary grinding wheel. dress ing tools which are journaled for their free rotations on the holder and have their working portions extended and exposed beyond opposite lateral portions of the holder, so that by the presentation of the head or working portion of the device between the grinding faces of a pair of cup shaped grinding wheels and the positioning of the one wheel in suitable proximity to the other, both of the grinding faces of the wheels will be simultaneously dressed ,-that is they will be freshcned and rendered more abrasive in their character after, from more or less protracted use, having become glazed and impaired for their most etlicicnt surface grinding action.

The invention is described in conjunction with the accompanying drawings and is defined in the claims.

In the drawings, Figure 1 is a plan view of the device for dressing grinding wheels,- a portion thereof at its forward end being represented in horizontal section; Fig. 9 is an edge view of the device; Fig. 3 is a perspective view showing the detachable head for carrying the dressing tools and parts appurtenant to such head in separated relations.

Similar characters of reference indicate corresponding parts in all of the views.

The device will be described as the same has been specifically constructed and practi- :ally used, although it is to be umterstomt that various changes of a minor character may be made in the device without departing from the invention.

In the drawings A represents a stock comprising a substantially rectangular body portion a and a handle portion Z); and 1% represents a tool carrying head which is represented in the form of a block which at its rear is provided with a horizontal rib Z which has an interlocking engagement in a groove therefor in the forward edge of the stock. The said head has opposite sidcwise opening recesses g g, and socket holes /L /L arranged in parallelism on lines transversely of the recesses, these socket holes being in the portions of the head both to the front and to the rear of the recesses, and

open at the front edge of the head.

I) 1) represent studs on which the rotary dressing tools a; a; are journal-supported. These studs are engaged through the socket holes, bottoming against the inner end of the latter and they pass through the perforated or apertured centers of the dressing tool, which latter may be constituted by atternated disks and star shaped or radially bladed members as conunonly comprised in already well known dressing tools for grinding wheels. The said studs have step shaped outer end portions whereby shoulders at right angles to each other are produced as represented at i and j, the shoulders 'i being at right angles to the lengths of the studs while those j are along the lengths of the studs and located outside of the shoulders 17; and these step-shaped or shouldered ends of the studs receive engagements therewith of a single plate or flat bar F which is held in its continen'lcnt by a screw G the shank of which passes through said plate and also through the head 13 and with a screw engagement into the stock and which screw by its head has a confining engagement against the plate to hold it i111- movably in its position as shown. This screw confined plate holds the journal studs against cndwise displacement and the shoulders of the screw studs which engage the end edges of the plate in turn prevent the latter from having any rotative shifting movement, while the screw serves the double duty of securing the plate on the head and confining the head on the stock.

By the means of detachable connection shown and last above referred to, new or different sized dressing tools may be replaced in the head and a head of one width, or having dressing tools of a given operative nature maybe substituted on the stock for one of some other size or nature of equipment.

I am aware that a device for dressing emery wheels has been proposed having at the forward end of the handle or holder a pair of dressing tools which are of dissimilar character, one being for rough dressing and the other for fine dressing, and both projecting as to working portions thereof beyond the end or head of the holder; but such a device could not possibly be used for simultaneously dressing the grinding faces, each having the shape of an annulus, of two oppositely located cup shaped wheels, as represented at y and y in Fig. 1 of the ac companying drawing. And somewhat further explaining the manner of utilization of the present device, it will be understood that the grinding wheel 1 is mounted for its rotation on a carriage which is bodily movable toward and away from the grinding wheel y. Now the stock is supported on a rest .2 so that its forward end having the.

tool carrying head is in presentation be tween the annular faces of the two cup shaped grinding wheels, and the one 3 is moved against the adjacent dressing tool and will be dressed thereby and by the contact of the grinding wheel y against the tool the device will be bodily crowded against the further grinding wheels annular face to simultaneously effect the dressing of the latter. And it is to be particularly appreciated that it is of importance in the making of this device that the working por tions of the dressing tools 00 w protrude beyond opposite lateral portions of the holder therefor.

I claim 1. A device for simultaneously dressing the working faces of opposed cup-shaped grinding-wheels, consisting of a holder, and a pair of rotary dressing tools journaled on the holder, and having their working portions extended beyond opposite lateral portions of the holder.

2. In a grinding wheel dressing device, the combination with a holder having recesses in the forward portion thereof which open to opposite lateral edge portions of the holder, of rotary dressing tools journal supported in said recesses, with their working portions protruding outwardly from said recesses and beyond the opposite lateral edges of the holder.

3. In a device for dressing grinding wheels, in combination, a stock and a head having rib and groove engagements and said head hav ing opposite sidewise opening recesses and socket holes arranged transversely of the recesses, rotary stone dressing tools located in said recesses and having their working portions extending outwardly beyond the ends thereof, ournal studs engaged in said socket holes and on'which the rotary dress ing tools are supported and which studs have step shaped outer end portions, a plate which by its opposite ends engages the step shaped ends of said journal studs, and a screw the shank of which passes through said plate, said head and with a screw engagement into the stock, and which by its head has a confining engagement against the plate.

Signed by me at Springfield, Mass, in presence of two subscribing witnesses.

SAMUEL WV. NE SBITT.

Witnesses WVM. S. BELLoWs, G. R. DRISCOLL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. G.

Images