US1100612A - Abrading device for grinding-machines. - Google Patents

Description

G. POINTON.

ABRADING DEVICE FOR GRINDINd MACHINES.

APPLICATION FILED MAR.17,1913.

Patented June 16, 191.4,

ull! Hill-mu George Pointcm Witwmoeo ado cum, a

COLUMBIA PLANOGRAPK C0 WAIHINGIDN, D. C.

UNITED sT 'rns PATENT OFFICE.

GEORGE POINTON, 0F TORONTQ, ONTARIO, CANADA.

ABRADING DEVICE FOB GRINDING-MACHINES.

Specification of Letters Patent. Patented J 1111 16, 1914 Application filed March 1?, 1913.

Serial No. 754,916.

of Ontario, Canada, have invented certain.

new and useful Improvements in Abrading Devices for Grinding-Machines; and I do declare the following to be a full, clear, and

exact description of the invention, such as will enable others skilled in the art towhich it appertains to make and use the same.

This invention relates to improvements in abrading devices for grinding machines.

One object of the invention is to provide a device of this character having an abrasive surface constructed of a plurality of pieces of emery cloth or the like of such shape that they may be cut from narrow strips and scraps of material with very little waste thereby affording a considerable saving of material and reducing the cost of renewing the devices.

Another object is to provide an abrading device having its abrasive surface formed of small suitably shaped pieces of material smoothly and firmly secured thereto without forming blisters and which are so spaced from each other as to leave clearance channels between them.

With these and other objects in view, the invention consists of certain novel features of construction, and the combination and arrangement of parts as will be more fully described and claimed In the accompanying drawings; Figure 1 is a bottom plan view of an abrading device constructed in accordance with my invention; Fig. 2 is a side view thereof; Fig. 3 is a plan view of a strip of abrasive material showing the manner in which the abrasive sections are cut therefrom for application to the disk and whereby the greatest number of sections may be cut from the strip with the least possible amount of waste.

My improved grinding device comprises a flat disk 1 which may be of any suitable shape and which is here shown as of cir-- cular form and as having a centrally disposed passage or socket 2 to receive the means whereby the disk is fastened to the grinding machine. To the lower smooth and uninterrupted flat face of the disk is glued, cemented or otherwise firmly fastened sections 3 of abrasive material such as emery cloth, paper or the like. The sections 3 may be of any suit-able size and shape and any desired number of sections may be provided for covering the working face of the disk. In the present instance the disk is shown as having secured thereto four sections or pieces 3 of abrasive material, said sections or pieces being cut in se'ctor shape and secured tothe working surface of the disk as shown, whereby radial channels 4 are formed bet-ween adjacent sectors, leading from the inner pointed ends 5 of the same, along-and between their straight sides 6, to their outer edges 7 which are preferably coincident with the periphery 8 of the disk. These channels afford clearance for the particles which are ground off from the surface of the object treated, and clearance for particles of the abrasive material itself. The sections 3 are furthermore cut in sector shape to facilitate the cutting thereof from narrow strips M of material with the least possible amount of waste, as clearly shown in Fig. 3 of the drawings, and which enables the largest number of sections to be cut from the strip. I do not, however, wish to be understood as confining myself exclusively to sector shaped sections as it is obvious that the sections may be formed in other shape, although I prefer that they have pointed inner ends 5 directed toward the center of the device and I prefer that the channels 4. between the various sections shall be substantially radial and shall in no case grow smaller toward the periphery of the device. The obvious reason for this preference is between the points 5 no space is leftwhere the material might accumulate near the center, such as would be the case if the points were cut off on arcs struck around said center. The centrifugal force tending to drive said material and the particles thereof toward the periphery of the disk, is of course least at the center of the device, and when such a space occurs there I find that the material is quite likely to accumulate. As for the radial channels, if the device is constructed as shown and described these channels are of a uniform size throughout their length and are strictly radial. In any event I would have them approximately radial and they should not grow smaller toward the periphery. The advantage of these channels is that in the rapid rotation of the device, the particles of the material acted on and the particles of the grinding surface tend to flow outward along these channels by reason of centrifugal force. In applying the sections to the disk it will also be obvioi s plurality of small pieces or sections, saidsections; may be secured to the face of the disk without. blisters being formed which frequently occurs in devices; of this character when; the abrasivematerial is secured to the disk in one piece. The forming of the grinding surface in sections also permits one or f more sections to. be removedand replaced by new sections when they are Worn, without; requiring the removal and renewal of the entire, abradingmaterial as is necessary inthe form of; abrading devices now in use when one. part of the abrading surface becomes worn before theother parts thereof. From the foregoing description taken in connection with the accompanying drawings, the construction. and operation of the invention will be readily understood without requiring a more extended explanation.

Having thus described my invention, what I claimvis:

The herein described abrading device comprising a disk having a fiat surface and adapted to be rotated on its axis in the nesses.

GEORGE POINTON. Witnesses VERA SHERMAN, M. SrRAcH-AN.

Copies;ot thiapatentr,may.be. obtainedfor five cents each, by addressing the; Commissioner of ZPatents, Washington, I). 0.

Images