US202309A - Improvement in saw-sharpening machines - Google Patents

Description

J. WAGNER. Saw-Sharpening Machine.

- Pafe'nted April 9, 1878.

UNTTED STATES PATENT CEEIcE.

JOHN WAGNER, OF GRAND RAPIDS, WISCONSIN.

IMPROVEMENT IN SAW-SHARPENING MACHINES.

Specification forming part of Letters Patent No. 202,309, dated April 9, 1878 application filed February 28, 1878.

To all whom it may concern.'

Be it known that I, JOHN WAGNER, of Grand Rapids, in the county of Wood and State of Wisconsin, have invented a new and Improved Saw-Sharpening Machine, of which the following is a full and accurate description, reference being had to the accompanying drawing.

The nature of my invention relates to a machine or apparatus for filing the teeth of saws; and it consists, iirst, of a clamp for holding the saw-plate, which clamp is tightened and held by a wedge-shaped plate inserted. between the clamp-legs, said wedge-plate being rst secured in a bench-vise; and, further, in the attachment of an adjustable file-handle and guide, which will hold the file at the eX- act angle for all teeth alike, and will prevent the ling below the intended tooth-line of the saw.

In the drawing, Figure 1 is a perspective view of the saw-sharpening machine ready for use. Fig. 2 is a cross-section, showing the construction of the saw-guide arrangement; and Fig. 3 is a section on line .n n' in Fig. 2.

A and A are the two jaws of the saw-clamp, consisting each of a bar, a, with a smooth inner face, and with a T-groove, b, in its outward face, and having each two legs, c. Triangular projections d are xed to the inner sides of one pair of legs for holding the legs of the two separate jaws apart; and carriagebolts D are for holding the two jaws A and Al together.

E is a plate, the ends of which are wedgeshaped, so as to enter between the spreadapart ends of the legs, and close the clampjaws upon each other. This plate E- is to be iirmly secured in a bench -vise, or by any other means, so as to be stationary.

The saw is placed in the clamp by rst`- springing the jaws apart, which is done by contracting their legs, and is iirmly held therein by placing said legs over the wedge ends of plate E, when, by pushing the clamp down- ;rgarl, the saw will be tightened and the clamp F is the file-guide holder, which is secured to an oblong T-bar, f. This bar f is loosely iitted into the T-shaped grooves b ofthe clampjaws, so as to slide forward and back therein,

and permit a limited vibrating motion in a vertical direction. The outward end of the tile-guide holder is rounded and graduated with degree-lines.

G is the guide for the Ele-handle, it being a tube, having a foot-piece angular therewith, which is pivoted upon the holder F by a thumbscrew, I, passing through the latter into the former, for adjusting and holding the handleguide in any desired angle with the holder. The rear end of the guide G is entered into a ferrule, g, which has an annular groove around its face. This ferrule g is surrounded by a ring, H, having a thumb-screw, h, the point of which enters the annular groove in ferrule g, so that said ring cannot slide off, but will turn loose upon it, and can be firmly secured in any desired angle by tightening the said set-screw h. This ring H has an endwise-proj ecting radial plate, i.

K is the saw-tile, secured into the ferruled end of a cylindrical bar, L, placed through the tube of guide G, and having an oblong groove, entered by the radial plate i of ring H, so that said bar L can be given a reciprocating sliding motion, but cannot be rotated in said guide-tube G without rst loosening the setscrew h, whereby the file-touch can be adjusted to the shape of the saw-tooth. The rear end of the cylindrical bar L is entered into a socket in handle M.

The modus operandi for using the above-described machine is as follows, to wit: The saw being properly adjusted in clamp A by means of a suitable gage, so that the saw-teeth will proj ect an equal distance above the clampjaws, and the clamp being placed over the wedge-plate, the file-guide holder is to be inserted in one of the T-grooves of the clamp, and the guide G is adjusted to the proper angle, when every other tooth of the saw is filed as long as the loose fit ofthe bar f in the groove b will permit the le to scrape the tooth. After one-half of the teeth have thus been sharpened the clamp, with the saw in it, is reversed, and the Ele-handle holder is inserted into the opposite T-groove b, and is adjusted again to the opposite similar angle, when the intermediate teeth are iiled in a similar manner.

As will be noticed, with this machine the operator cannot, in sharpening a saw, do otherwise than le all the teeth to the same depth and on the same an gle, the operation requiring neither skill nor a steady hand.

What l claim as my invention is- 1. The saw-clamp consisting of bars a a, legs c o c c, having projections d d and bolts D D, in combination With the Wedge-plate E, substantially as and for the purpose set forth.

2. In combination with a saw-clamp, substantially as described, and having T-shaped grooves, the holder F, guide Gr, ring H, setscrew h, radial plate i, bar L, handle M, and screw I, all constructed and arranged substanially in the manner and for the purpose set orth.

J OHNv YVAGNER.

Witnesses JOHN HAMM, CHAs. HAUsE.

Images