US400660A - Machine for grinding shimer-molding bits - Google Patents

Description

(No Model.)

11,. 0. GILBERT, MACHINE FOR GRINDING SHIMER'MOLDING BITS, 8:0.

' Patented Apr. 2,

ATENT .ZFricE.

I-IIRAM GILBERT, OF BURLINGTON, VERMONT.

MACHINE FOR GRINDING S HlMER-MOLDING BITS, 81,0.

SPECIFICATION forming part of Letters Patent No. 400,660, dated April 2, 1889.

Application filed July 5, 1888.

T at whom it may concern.-

Be itknown that "I, HIRAM O. GILBERT, a citizen of the United States, residing at Burlington, in the county of Ohittenden and State of Vermont, have invented certain new and useful Improvements in Machines for Grindin g Shimer Molding and Sash Heads and other Circular Bits of Matcher-Heads, of which the u following is a specification, reference being mandrel passes, a revolving block by which the mandrel is adjusted vertically, a handle for horizontally revolving the adj listing-block, and a carriage by means of which the head is moved back and forth in relation to the emery-wheel, as will be more fully described hereinafter.

The object of my invention is to provide a machine by means of which the circular bits of matcher-heads can be quickly and accurately sharpened, and all of those portions of the circular bits which are upon the same plane or line can be alternatelysharpened by simply revolving the head to which they are attached in relation to the emerywheel.

The accompanying drawing represents a perspective of a machine embodying my invention.

I represents a suitable carriage, which is adapted to be moved horizontally back and forth in relation to the emery-wheel B by means of the hand-wheel W and the shaft to which the wheel is secured. The "carriage I, which may be of any ordinary construction, and which has only an endwise movement, has mounted upon its top a suitable support, upon the top of which is mounted the handle F, the adjusting-block D, and the mandrelframe E. The mandrel-frame is made circular at its upper end, and passing horizontally through it is the mandrel A, which is pro- Vided with the hand-wheel O at one end, and

Serial No. 279,014. (No model.)

upon which the head H, carrying the rotary cutter, is placed. The shank of the frame E is made screw threaded and passes down through the adjusting block D, which is adapted to be revolved by means of a detachable handle, which is adapted to catch in the openings in its side, and thus raise or lower the frame E, carrying the mandrel A, and the head H, placed upon it. This block D rests upon the handle F, so that when the clamping-screw N is loosened the handle can be turned partially around, carrying the block, the frame, and the mandrel with it, thus adjusting the head H into any desired relation to the wheel B. The clamping-screw N passes down through a slot in the support M, for the purpose of locking the handle F in any desired position, and the handle F can be moved horizontally around the length of this slot, and thus turning the mandrel and its frame in any desired direction. Rising above the carriage at one side are the two standards P, each of which are made in two parts and the upper parts of which are vertically adjustable, so that the wheel B can be adjusted in relation to the head H. This wheel is secured to a shaft, which is j ournaled upon the upper ends of the bearings P, and which is provided with a drivingpulley, S,at its center. The wheel B, having been adjusted in relation to the bits, and the head having been turned in to the desired position, all those portions of the bits which are upon the same circle can be sharpened alternately and with great rapidity and the utmost precision. After one portion of all the bits have been sharpened the head and wheel can be given anyother adjustment necessary, and thenthe other portions of the cutting-edges of the bits also sharpened.

By means of the construction here shown and described all of the difficulty of sharpening bits having uneven cutting-edges is entirely done away with. It is only necessary to place the head I-l upon the mandrel and then turn the mandrel into the desired position to properly present the bits to the wheel, and as fast as one bit has been sharpened turn' the mandrel so as to present another bit.

Having thus described my invention, I

claimin g-block by which the frame is adjusted vertically, a handle for turning the frame horizontally around, a locking-screw for holding the handle in any desired position, and a reoiproeatin g carriage, substantially as set forth.

In testimony whereof I do affix my signature in presence of two witnesses.

IIIRAM C. GILBERT.

Witnesses:

HARMON S. GRAVES, CHARLES E. ALLEN.

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