US1404605A - Surface-grinding machine - Google Patents

Description

J. C. HANSEN.

SURFACE GRINDING MACHINE.

APPLICATION FILED NOV. 30,1920.

1,404,605, Patented Jan. 24, 1922.

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' lJ lllI mnnul UNITED STATES PATENT OFFICE.

'ULIUS C. HANSEN, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, T0 HANSEN GRINDER COMPANY, OF COOK COUNTY, ILLINOIS, A CORPORATION OF ILLINOIS.

SURFACE-GRINDING, MACHINE.

Application filed November 80, 1520.

To all whom it may concern Be it known that I, JULiUs C. IIANSEN, a citizen of the United States, residing at the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Surface- Grinding Machines, of which the following is a specification.

My invention relates to that class of machines known as surface grinding machines, in which the objects which it is desired to grind are placed upon a table'in proximity to a rotating abrasive disk, and are suitably ground as they are brought into contact with said disk.

One object of my said invention is to provide a disk for holding the abrasive material, and for rotation, which may be easily, quickly and accurately adjusted upon any suitable rotating spindle for rotation in a plane at right an les to the axis of the spindle.

Another object is to provide a table for supporting the work which is simple in construction, strong, and may be easily and quickly moved, adjusted and secured in different positions as desired.

Another object is to provide a disk surface grinder which shall consist of few parts, and which can be cheaply made for use in small shops which cannot afford the more complicated and expensive grinders now in use.

WVith the foregoing, and other objects in view, which willmore particularly appear in the following specification, my invention consists of the arrangement of parts as hereinafter described and claimed, and while I do not wish to be restricted to the exact details of construction shown, yet, for the purposes of illustratin a particular embodiment thereof, reference is had to the accompanying drawings, in which like ref erence characters designate the same parts throughout the several views, and in which,

Figure 1 is a side elevation of my surface grinder, showing the abrasive disk mounted upon the spindle of an electric motor.

Figure 2 is a rear elevation from the left in Figure l.

Figure 3 1s a section view of the arms, and the curved ways, on the line m-m of Fig. 2.

In the accompanying drawings, I have Specification of Letters Patent.

Patented Jan. 24, 1922.

Serial No. 427,705.

shown one embodiment of my said invention, in which I have mounted the parts upon a suitable base as 1, cast in one piece, and having at one end a pedestal as 2, suitable for mounting a motor as 3, or other means for rotating a shaft as 5 having the abrasive disk 4: mounted upon one end thereof. I11 the mounting of my said abrasive disk upon the shaft, I have preferably pro vided the end of the shaft with a taper, as shown by the dotted lines, and I have provided the hub 7 of the abrasive disk, with a tapered socket as 6, shown in dotted lines, for accurate mounting upon said shaft. I have also provided a set screw as 8 for attaching the abrasive disk upon the shaft against accidental movement thereon. By this method of construction it is always possible to release the set screw, and remove the abrasive disk quickly and easily from the shaft for replacing it with another, when desired, and when it is desired the abrasive disk may be returned, and again mounted upon the shaft, and the operator will always be sure that it is accurately mounted to rotate in a plane at exactly right angles to the axis of the shaft.

At a suitable distance from the face of the abrasive disk I have provided the work table 10, having its edge bevelled underneath, as shown. Underneath the said work table, and extending underneath the abrasive disk, I have provided two curved slideways in the base 1, said slideways being numbered 9, 9, and extending longitudinally of said base, with a suitable webbing between saidmembers. I have preferably made the curve of said slideways on that of a circle, having itscenter midway of the front edge of the work table, as by this construction, said edge of the work table is always at the same. elevation and distance from the abrasive disk, at the various positions to which it may be adjusted from time to time.

'The outer edges of the said slideways I have preferably made parallel, with an opening midway between for the clamping bolt 14.

Attached to the under side of the work table and extending in a forward and downward direction, I have provided a bracket, having two curved arms adapted to engage the slideways, as 11, 11. Said curved arms are constructed with the same curve to the underside as the curve of the upper surface of the slideways, and the outer flanges 12, 12 parallel on their inner sides, and adapted to engage the outer edges of said slideways. Midway between said arms, I have provided the slot 13 with parallel sides as shown.

To look said work table and said arms in any desired position, I have provided the clamping bolt 14;, passing through the'slot 13, and the opening between the members 9, 9 of the slideway, and having the head 15, curved on its under side where it contacts with the Webbing of the arms 11, 11 and threaded at its lower extremity for receiving a nut, as 16, for locking said clamping bolt against said slideways and said arms in whatever position it may be adjusted to.-

By this construction, the work table is easily and quickly released by turning the clamping nut 16, and after being moved to the new position, is quickly and securely locked by this nut in the new position desired. The large curve of the slideways, the

broad base formed therebetween and the long contact surface between the curved arms and the curved slideways, gives a very firm and rigid support for the work table, and the large surface of contact by the head of the locking bolt, holds said work table very rigidly and securely in all positions. By making the curve of said slideways and said arms as described, the front edge of the table is at a uniform distance and elevation at all the various positions to which it may be adjusted.

In my illustration, I have shown my abrasive disk as mounted directly upon the end of the shaft of an electric motor. This is a very simple, convenient, and compact method of mounting and driving said abrasive disk, but it will be apparent that my abrasive disk may be equally well mounted for rotation upon the end of any revolvingshaft, as a polishing head, or lathe, or other shafting.

When it is considered that my surface grinding machine as designed consists of practically only three parts, the base, the work table with depending arms, and the abrasive disk, it will be apparent how simply and cheaply it may be constructed, and yet with the construction as shown, it is capable of all of the various adjustments that more complicated and expensive machines have, and that in all positions, it is rigidly and securely held in position, and can easily and quickly be moved by simply releasing and tightening one nut.

When desired, a graduated index scale may be placed on the-"curved slideway to facilitate the accurate and quick adjustment of the work table to different angles desired by the operator.

Having thus described my invention, what I claim and desire to secure by Letters Patent, is the following:

1; A grinding machine, a base provided with a substantially inverted U-shaped extension having its upper sid concaved to form curved guideways at the edges of the extension, said upper side of the'extension having a slot therein, a motor on the base provided with a rotatable shaft, an abrasive disc on the shaft, a work table provided with a depending curved supporting bracket of a width slightly greater'than the width of the curved extension and whose curvature is the sameas the curvature of the upper, sid of said extension and provided with an opening adapted to coincide with the slot in said extension, said curved bracket having a flange at each side edge, .the flanges adapted to overlap the edges of the extension, and a bolt and nut operating in the slot and opening of the extensionand bracket to clamp the bracket and the table in adjusted positions on the extension.

' 2. In a grinding machine, a base provided with a substantially inverted U-shaped extension having its upper side concave to form a curved surface and curved guideways at its edges, a motor on the base provided with a rotatable shaft, an abrasive disc on the shaft, a work table provided with a relatively long curved supporting bracket whose curvature is the same as the curvature of the upper sid of said extension and whose width is slightly greater than the width of the extension, said curved bracket having a flange at each side edge, the flanges adapted to. overlap the curved side edges of the extension and be guided thereby so as toguide the bracket in its movements on the extension, and means for clamping the bracket of the table and the extension together.

3. In a grinding machine, a base, a horizontally projecting, substantially inverted U-shapedextension having a concaved upper surface carried thereby, a motor, a work shaft for the motor and anabrasive disc mounted on the said shaft, a work table carrying a depending arm of the same curvature as the concaved surface of the ex-v tension, the said extension and dependlng arm having openings therein to receive a,

ing therein and provided with curved guideways at its upper edges, a motor mounted on the base, a Work shaft for the motor, an abrasive disc secured to the said shaft, a work table carrying a depending curved bracket conforming in configuration to the curved upper surface of the extension and having a slot therein, flanges at the edges of said bracket overlapping the sides of the extension whereby horizontal displacement is prevented and a bolt extending through the said opening and slot for locking the work table in adjusted position.

In testimony whereof, I have hereunto signed my name to the foregoing specification, in the presence of two attesting witnesses.

JULIUS C. HANSEN.

In presence of- GEORGE E. GOULD, CHESTER W. BROWN.

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