An Improved Tool-rest for Grindstones and the like.
Year: 1896

page_text: Date of Application, 4th May, 1896-Accepted, 13th June, 1896
COMPLETE SPECIFICATION.
An Improved Tool-rest for Grindstones and the like.
We, JULIUS FRANZ LORENZ, of Pöhla, near Schwarzenberg, Master Joiner,.
and HERMANN LEISTNER, of Zschorlau, near Schneeberg, Merchant, both of
Saxony, in the German Empire, do hereby declare the nature of this invention and
in what manner the same is to be performed, to be particularly described and.
ascertained in and by the following statement :-
This invention relates to an adjustable tool-rest for grindstones and the like, and.
is designed to enable cutting-tools of various kinds, more especially those used by
wood-workers, such as joiners, wheelwrights, carpenters, etc., to be correctly and.
uniformly ground in a certain and convenient manner.
In the accompanying drawing :-
Figure 1 is a side elevation, and
Figure 2 a plan of our apparatus.
Figure 3 is a section, illustrating a detail of construction.
g is the upper part of the grindstone-trough or frame, on which is mounted the
grindstone p. The tool-rest is mounted on the part g by means of two slide-
bars l, i. These slide-bars have a longitudinal opening or slot which is lettered 1,
the strips or bars themselves being lettered i. At both ends of the slide-bars l, i
are holes for the reception of wood-screws or bolts. The upper part of the
apparatus consists of the cheeks or side plates f, which are provided with pins or
projections 9 on their under side, which projections slide in the slots of the slide-
bars 1, i. Each of the side-plates f has an upwardly extending bracket c at its
front end; these brackets serve as supports or bearings for the pivots of the
movable part of the rest, which comprises the arm or segment a and the cross-
piece or plate o. This rest a, o is thus movable relatively to the brackets d and
can be secured at the required angle by means of the clamping-screw e in the said
brackets d.
The cross-piece or plate o is provided at its upper edge with a rest k for the
finger or fingers holding the tool to be sharpened. The clamping-screws h hold the
side-plates fin a fixed position.
If it be desired to sharpen a tool, for example, a plane-iron, it is laid on the
cross-piece o and the grindstone set in motion, the apparatus being previously
adjusted, as a whole, relatively to the grindstone, and the cap-shaped rest a, o,
to an angle equivalent to the bevel or chamfer to which the edge of the tool is to
be ground.
The advantages gained by the use of this apparatus by the grinder, over
grinding with a free hand or using a narrow rest, are very considerable and need no
demonstration. The bevel or chamfered surface produced thereby, even in the
hands of an unskilled person, is beautifully uniform, bad grinding being entirely
obviated. This surface will be somewhat hollow according to the curvature of the
grindstone.
The apparatus can be made of cast iron or other suitable material, the plate o
being, however, preferably covered with zinc.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
An adjustable tool-rest for grindstones and the like, comprising a pivotally

page_text: mounted rest (a, o, k) capable of being adjusted to the requisite angle and
having its side plates or checks (f) adjustable in slide-bars (i, 1), the part a of
the said rest serving for fastening or securing the same and the part o as a rest
or supporting piece for the tool to be ground, and the part (k) serving as a support
for the fingers of the grinder, substantially as, and for the purposes, hereinbefore
described.
· ניז
1000
D. YOUNG & Co.,
11 & 12, Southampton Buildings, London, W.C.,
Agents for the Applicants.