Improvements in Machines for Planing Wood and the like.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Machines for Planing Wood and the like.
I, ANDERS AUGUST WESTMAN, of Gamla Kungsholmsbrogatan 21, Stockholm,
Sweden, Mechanical Engineer, do hereby declare the nature of this Invention
to be as follows:-
The present Invention relates to the arrangement of certain parts of planing
machines, provided with rotating knife blades and stationary knives, and it has
for its object to overcome the great disadvantage of the planing machines. at
present in use, which is, that after a short time the machine must be stopped
because the knives become dull, and must be taken out for the purpose of
sharpening them, thus occasioning great loss of time.
The Invention consists in providing two or more separate knife frames and so
arranging these that one frame may be removed and another with sharpened
knives substituted, whilst a third knife is in action, which latter is treated in
similar manner after the second knife is again in working position.
The Invention is illustrated by the accompanying drawings, Fig. 1 of which
is a plan showing a portion of a planing machine with two stationary knife
frames, of which one is idle and partly displaced. Fig. 2 is a longitudinal section
and Fig. 3 a side view of the latter with one frame in position.
The frames in which the knives are carried are of the usual form and are
provided at one end with hand grips c. The frames a in this machine do not rest
on the table d, but on revolvable shafts or rollers e which are carried in a channel
extending across the table d. The shafts d of each frame are connected together
by means of levers g and rods on the back ends of the shafts e, so that these
will turn simultaneously and the frames will rest either on the round or on the
flat portion of the shafts as shown at Fig. 2. By turning the levers k on the front
end of each set of shafts or rollers as shown at Fig. 2 one frame can be raised
into working position to act on the wood and the other withdrawn, the frame
in working position resting on the round portion and the idle frame resting on the
Hat portion of the shafts e.
When a knife frame a, has by turning the corresponding shafts e been lowered
out of working position and rests on the flat portion of its shafts e it can be
removed for the purpose of sharpening the knives, or another frame containing
sharp knives can be substituted; this exchange of one frame being effected
without stopping the machine. Instead of the above described shafts or rollers e
for raising and lowering the frames it is obvious that eccentrics or the like may
be used. If one frame is withdrawn, a disc or duminy frame must be provided
in order that the travelling wood may have the necessary support, and such a
disc can be coupled to each frame so that the act of removing any frame draws
its dummy frame into position and vice versa.
Dated this 23rd day of Santambor
1906
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather, Chartered Patent Agents,
62 Saint Vincent Street, Glasgow, Agent for the Applicant..

page_text: Improvements in Machines for Planing Wood and the like.
I, ANDERS AUGUST WESTMAN, of Gamla Kungsholmsbrogatan 21, Stockholm,
Sweden, Mechanical Engineer, 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:-
The present Invention relates to the arrangement of certain parts of planing
machines for wood, provided with rotating knife-blades and stationary knives,
placed in sliding frames, or planing boxes, and it has for its object to overcome
the great disadvantage of the planing machines at present in use, which is, that
after a short time the machine must be stopped because the knives become dull,
and must be taken out for sharpening, thus occasioning great loss of time.
The Invention consists in providing two or more separate knife frames
(planing boxes), so that one planing box may be removed and another with
sharpened knives substituted, whilst a third box is in action, which latter is treated
in similar manner after the second box is again in working position.
One method of carrying out the Invention is illustrated by the drawing left
with the Provisional Specification, Fig. 1 of which is a plan showing a portion of
a planing machine with two slidable planing boxes, of which one is idle and
partly displaced. Fig. 2 is a longitudinal section, and Fig. 3 a side view of the
fatter with one knife frame in position.
The frames a in which the knives b are carried are of the usual form and are
provided at one end with hand grips c. The frames a in this machine rest or slide
on revolvable shafts or rollers e which are carried in a channel extending across
the table d. The shafts of each frame are preferably connected together by
means of levers g and rods h on the back ends of the shafts e, so that these will
turn simultaneously and the frames will rest either on the round or on the flat
portion of the shafts as shown at Fig. 2. By turning the levers k on the front
end of each set of shafts or rollers e as shown at Fig. 2 one frame can be raised
into working position to act on the wood i and the other withdrawn, the frame in
working position resting on the round portion and the idle frame resting on the
flat portion of the shafts e.
When a knife frame a has by turning the corresponding shafts e been lowered
out of working position and rests on the flat of its shafts e it can be removed for
the purpose of sharpening the knives, or another frame containing sharp knives
can be substituted; this exchange of one frame being effected without stopping
the machine.
It is, of course, not necessary to carry out the Invention just in the manner
described, since it may be modified in details without departing from this
invention. The planing machine may, of course, he so arranged that more than
two knife frames may be placed in the same at any other time. Instead of the
above described shafts or rollers c for raising and lowering the frames it is
obvious that eccentrics or the like may be used, or such devices may be entirely
done away with, since it is possible to withdraw one knife frame and substitute
another while the third is working as long as the boxes rest on slides on both ends
so as to be easily withdrawn, without lowering the frame that is to be withdrawn,
though it is most practical to have some such arrangement for raising and lowering
the frames as described.
The said mechanism for raising or lowering the knife frames may be so con-
nected with the common mechanism for raising or lowering the rollers, 'hat are

page_text: commonly provided for pressing down the board, that the board is relieved of the
pressure at the same time the frame is lowered, or vice versa.
If one frame is withdrawn, a disc or dummy frame should be provided in order
that the travelling wood may have the necessary support, and such a disc may be
coupled to each frame so that the act of removing any frame draws its dummy
frame into position and vice versa. Instead of such dummy frame, the knife
frame that is to be inserted may of course be substituted.
It is obvious that a planing machine arranged as set forth, so that two or more
sets of knife frames may be inserted in the same at one time, will be much more
economical in its working than the old kind of planing machines which have to
be stopped very often for exchanging or sharpening the knives.
Having now particularly described and ascertained the nature of this said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. The combination with a planing machine of two or more withdrawable knife
frames (planing boxes), substantially as and for the purpose set forth.
2. The combination with a planing machine of two or more withdrawable knife
frames (planing boxes) and means for raising or lowering said frames, substantially
as and for the purpose set forth.
3. The combination with a planing machine of two or more withdrawable knife
frames and revolvable shafts or rollers on which the said knife frames rest, said
rollers having a flat surface on one side and the rollers for each frame being so
connected that both ends of the frame will simultaneously rest either on the flat
or round surfaces, substantially as and for the purpose specified.
Dated this 15th day of June 1897
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather, Chartered Patent Agents,
62 Saint Vincent Street, Glasgow, Agent for the Applicant.