US990250A

US990250A - Attachment for disk-grinding machines.

Info

Publication number: US990250A
Application number: US57382510A
Authority: US
Inventors: Frederick N Gardner; Frederic E Gardner
Original assignee: LOUIS WALDO THOMPSON
Current assignee: LOUIS WALDO THOMPSON
Priority date: 1910-07-26
Filing date: 1910-07-26
Publication date: 1911-04-25
Anticipated expiration: 1928-04-25

Description

F. N. & P. E. GARDNER. ATTACHMENT FOR DISK GRINDING MACHINES.

APPLICATION TILED JULY 26, 1910.

Patented Apr. 25, 1911.

2 SHBETB-BHEET 1 l zr/erzzar." axfw- M JIJW K514 a ma F. N. dz F. E. GARDNER. ATTACHMENT FOR DISK GRINDING MACEINBQ.

APPLICATION TILED JULY 20, 1010.

a (2M QWM Ja mvfizwz Patented Apr. 25, 1911.

UNITED STATESQPATENT OFFICE.

FREDERICK N. GARDNER AND FREDERIC E. GARDNER, 0F BELOIT, WISCONSIN, AS- SIGNORS OF ONE-THIRD TO LOUIS W'ALDO THOMPSON, OF BELOIT. WISCONSIN.

Application filed July 26,

To all who m it may concern:

Be it known that we, FREDERICK N. Gaun- Ma: and Fmcnnmo E. GARDNER, citizens of the United States residing at Beloit, in the county of Rock and State of Wisconsin, have invented certain new and useful improvements in Attaclunents 'tor .l)isk-(lriuding Machines, of which the following is a specification.

This invention contemplates an attach= ment for disk grinding machines of the type disclosed in our copending application. Serial No. 528,791, filed November 18, moo. The machine shown in said application is especially adapted for grinding or surfacing wood, and is particularly intended for use by pattern makers.

The object of this invention is to provide an attachment for disk grinders by means of which circular pieces of work of widely varying diameter may be quickly and accu- .rately finished or ground down to the de sired size.

In the accompanying drawings, Figure 1 is a fragment-a1 side elevation of a disk grinding machine having thereon an attachment embodying our invention. Fig. 9 is a fragmentary plan view showing the attachment and a portion of the machine in the position in which they appear in Fig. "1. Fig. 3 is an'enlarged plan view of the attachment and fragment of the machine with the work table in a horizontal position. Fig. -t is a section taken in the plane of line t 4 of Fig. 3. Fig. 5 is a section on line 5 5 of Fig. 4. Fig. (3 is a sectional view through a piece of work. Fig. 7 is a plan yiew of another piece of work. Figs. 8 and 9 are elevations of two forms of pins for mounting the work.

The machine illustrated in Fig. 1 comprises a suitable base 1 having bearings 2 thereon in which is mounted a shaft 3 carrying a drive pulley 1-. Fixed on one end of the shaft 3 is a disk 5, to the outer face of which is secured a sheet of sand paper or other abrasive material. A segment 6 having a. groove 7 therein is fixed to a member 8 which is vertically slidablo upon the base 1. Said member is attached to one end of a cable 9 passing over a sheave 10, the other end ot said cable carrying a countel-balancing weight (not shown). The work t'able'll is carried by a segment l2 having a curved rib on itsinner face which travels in the groove 7 in the segment (i. The segments (5 Specification of Letters Patent.

1910. Serial No. 573,825.

ATTACHMENT FOR DISK-GRINDING MACHINES.

Patented Apr. 25, 1911.

and 1'. are secured together by meansoi bolts 13 passing through the segment 6 and through areuate slots 14 in the segmentll, said bolts having nuts 15 turned thereon.

It will be seen that the work table 11 may be titled either upwardly or downwardly from a horizontal position into planes at various angles with the disk 5. The inner edge of said table is beveled, as shown, to permit such tilting movement. The center of the are upon which the groove 7 is formed in a point which lies close to the abrading surface of the disk 5 and coincides with the innermost portion of the beveled edge oi the table 1.1. The movement of the segment 12 being a rotative one. and the axis of rotation being coincident with the inner upper edge of the work table, itwill be seen that the work table may be. tilted without changing the position of the inner edge thereof. To clamp the table in the desired position one of the nuts 15 may be turned up tightly by means of a handle 16 formed thereon.

()ur attzwhment'. in the form herein shown, comprises a bar 17 which fits slidably in a groove 18 formed in the face of the work table 11 parallel to the grinding disk 5. Fixed upon the bar 17 is a plate 19 having a slot. extending tI-..1-ctln'oiigl1 at right angles to the bar 17. In the present instance the plate 19 is formed in two duplicate pieces spaced apart on the bar 17 to form the slot 20. in the'slot 30, said bar having a plurality of holes 32 therein. The outer end oflthe bar 21 has an angular lug 21$ thereon in which is threaded a stop screw 21. said screw being arranged to engage the outer edge of the work table 11 and limit the inward movement of the bar 21.

Tn Figs. 13 and 7, we have shown sample pieces of work which may be ground Will! our attaelnnent. The work is mounted on the bar 21 by means such. as a pin .25 (Fig. 9) the point ot'the pin being driven into the work and the head fitting closely but rotatably in one of the openings 22 in the bar 21, as shown in Fig. 4. Another form of pin .26 is shown in Fig. 8. The head of this pin tits tightly into a recess a formed in the block a (Fig. 6), the stem of the pin being adapted to enter one of the openings 22 in A bar 21 is slidably mounted thel ar 21, so that thework may be rotated.

from very small to relatively large radius, the variation not depending entirely upon the length of the adjusting or stop screw 24:.

The attachment is slidable in the groove 18 over the entire face of the grinding disk 5. A This is very important in practice because it permits of shifting the work for contact with different points along the face of the disk, or in other words, permits of shifting the cutting point. WVhen circular pieces of work are being ground, the cutting is confined to a narrow space on the disk, and unless the work can be readily and frequently-moved with reference to the disk, the abrading material in this space becomes filled with tightly packed Wood dust, thus ii alierially reducing the cutting action of the t is r.

In use, a pin 25 'or 26 is fixed in a pieceof work,'the 'slidable bar 21 is drawn outwardly a short distance, and the pin fitted into one of the openings 22, depending upon the size of the piece of work, When the stop screw 24 has been set to limit inward movement of the bar 21 at the proper point, said bar is slid inwardly to carry the work against the grinding d1sk 5. The workman may rotate the work with his fingers to present its table'to move toward and away from the face of said disk; said member having an opening therein; a pin adapted to be fixed to the work and rotate in said opening so that the Workmay be rotated; and adjustable means for limiting the inward movement of said member.

2. In a disk grinding machine, the combi;

nation of a rotary grinding disk; a. work table supported adjacent to said disk; a bar slidably mounted on said table toimove toward and away from said disk; said bar having an opening therein; a pin adapted to be fixed to the work and rotate in said opening; and stop means carried by said bar and 1 adapted to limit the inward movement of Saidbar.

3. In a disk grinding machine, the combination of a rotary grinding disk; a work table supported adjacent to said disk; a bar slidably mounted on said table to move to ward and away from said disk, said bar having a series of holes therein; a pin adapted to be fixed to the work and rotate in one of said holes; and a stop screw carried by the outer end of said bar, said screw being arranged to engage the edge of the Work table for limiting inward movement of said bar 4:. In a disk grinding machine, the combination of a rotary grinding disk; a work table supported adjacent to said disk, said table having a groove in its upper face parallel with said disk; a barfitting slid'ably in said groove; a plate fixed upon said bar and having a slot therethrough perpendicular to said bar; a second bar slidably mounted in said slot; said second bar having a longitudinal series of holes therein; a pin adapted to be fixed to the work and rotate in one of said holes; and an adjustable. stop screw carried by the outer end of said second bar, said screw being adapted to engage the outer edge of the work table for limiting inward movement of said second bar.

5. In a disk grinding machine, the combinatioii of a rotary grinding disk; a work table supported adjacent to said disk, said table havin a groove in its upper face parallel with said disk; a bar slidableinsaid groove over substantially .the entire face of said disk; a member mounted on. said bar tQ'fslide toward and away from said disk;

inc-ans for forming a" rotatable connection between said member and a piece of work; and adjustable means for limiting the inward movement of said member.

FREDERICK N. GARDNER.

FREDERIG E. GARDNER.

l/Vitnesses:

II. M, ADAMS, CARRIE HIoKsoN.