Improvements in or connected with Mitre-sawing-frames or Saw-guide-frames for Mitreing.
Year: 1895

page_text: Date of Application, 12th June, 1895-Accepted, 10th Aug.. 1895
Improvements in or connected with Mitre-sawing-frames or
Saw-guide-frames for Mitreing.
I CARL BIELEFELD, Joiner of Essen (Rhenish-Prussia) Rellinghauserstr., 2, 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
statenient:-
The object of this invention is a mitre-saw-guide-frame of wood or other soft
material which is protected in every way against the saw (which is used for cutting
the mitre) running into it, by means of glass rails with which the guide-slots are
lined inside, and also by means of an adjustable stop rail attached to the saw.
On the annexed drawing
Fig. 1, shows a side elevation of the saw-guide-frame.
Fig. 2 a plan of same (top view).
Fig. 3. a front elevation of same.
Fig. 4 a section through the line a-x of Fig. 1.
Fig. 5 a section through the line y-y of Fig. 2.
Fig. 6. the saw with stop-rail attached.
The guide-slots a, are lined internally with slips b, of glass or other (suitable)
material, which are let into internal edges of the slots in such a manner that
the teeth of the saw can only touch said slips but not run into the edges of the
slots. To facilitate the adjustment of the glass slips to the angle of the mitre, they
are made of preferably semi-circular section.
g
To construct the saw-guide-frame, the sidepieces, are first fixed to the bottom c,
then perpendicular holes y are drilled from top to bottom of the sides f, in the places
where guide slots are wanted, and then the glass-slips are let into each side of the
holes (Fig. 5).
These glass slips do not quite reach up to the two top edges of the frame
but are shorter, so that when the cut is started, the saw does not directly come
in contact with the glass slips, the stops of which are tipped or crowned with
short slips of wood, thus prevents the blunting of the teeth of the saw when the
cut is started.
The saw used for the mitre-cutting is provided with a stop rail d adjustable to
the depth of the guide slots, this rail comes in contact with the top edges of the
sides of the saw-guide-frame, as soon as the mitre is cut and when previously
set properly it prevents the saw from cutting into, or through the bottom of the
frame.
As shown in Fig. 4 the sides f, are made up of three layers of wood which are
glued together in such a manner that in the two outer pieces the grain of the wood
runs lengthways and in the inner layer the grain runs crossways.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I claim:
1. In saw-guide-frames for mitre-cutting guide-slots lined with any suitable hard
material to protect the inner edges of said slots against the teeth of the saw as
herein described and duly set forth.
.
2. In connection with saw-guide-frames for mitre-cutting as herein described
a saw provided with an adjustable or check-rail which allows the blade of said

page_text: saw to cut down to a certain depth only to prevent the teeth of the saw from
penetrating the bottom of the saw-guide-frame, all as hercin fully described and
set forth.
D
1
T
ROBERT KRAYN,
Attorney.