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Патент USA US3088521

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May 7, 1963
Filed March 8, 1961
2 Sheets-Sheet 1
‘SH/1V [v0 ?ll/(E WA TA NABE
May 7, 1963
Filed March 8, 1961
2 Sheets-Sheet 2
I/ H
United States Patent C M
Patented May 7, 1963
horizontal slot 16, through which said bars are adjust
ably secured to the main body with a ?xing bolt 17. To
each outer end of the bars 15- is a side guide chain wheel
18 is secured, and moreover, to the bottom end of the
main body 10 a bottom .guide chain wheel 19 is secured.
An endless cutting chain 20 of quadrilateral shape is en—
gaged with the chain wheels 13-, 18 ‘and 19, as more clearly
shown in FIGS. 5 to 7.
The endless cutting chain 20 consists of chisel links
Shinnosuke Watanabe, Sakyoku, Kyoto, Japan, assignor
to Toyoko Takagi, Kyoto, Japan
Filed Mar. 8, 1961, Ser. No. 94,384
3 Claims. (Cl. 144-72)
The present invention relates to timber perforating
machines, and more particularly, such machines that can
make rectangular holes in timber mechanically, and has 10 21 and saw links 22, each of said chisel links and each
pair of said saw links being arranged alternately and con
for its object to obtain a timber perforating machine com
nected by a pin 23. The chisel link 21 is of U shape
prising a pair of vertical supports located in space, each of
and has a chisel blade 24 on its top end as shown in
which has a receiving opening ‘for setting a timber, each
FIGS. 8 and 9. The saw link v22 is a plate and has saw
upper portion of said supports being in a telescopic ar
rangement under in?uence of a restoring spring, a mov 15 teeth 25 on its top end as shown in FIGS. 10 and 11.
26 shows an operating lever handle pivoted on the
able main body secured to both said upper portions, carry
top end of the frame 1, the central portion of which handle
ing an endless cutting chain, which consists of chisel
is pivotally secured to the top portion of the main body 10.
links and saw links arranged alternately and is located
The timber perforating machine according to my inven
between said supports, engaging with a driving chain
wheel and guide chain wheels, and ‘an operating handle 20 tion is thus constructed, and its operation is as follows:
A timber 27, in which a rectangular hole is required, is
for moving the main body together with the cutting chain
inserted in the receiving openings 3‘ and is rigidly set by
towards the timber against the restoring springs.
the screws 4, and the driving pulley 14 is rotated by a
Hitherto the production of rectangular holes in timber
motor or any other driving source, then the driving chain
has been chie?y carried out in manual manners, namely
by using chisels, and consequently, it has been very in 25 wheel 13, which is ?rmly united with the driving shaft
12 together with said driving pulley, is rotated, thereby
e?icient. According to my invention rectangular holes
driving the endless cutting chain 20‘. Now the lever
can be easily and productively made in timber by only
handle 26 is pressed downwards, then the main body 10
pressing the operating handle downwards, and moreover,
connected to said handle goes down together with the
those of various sizes can be made by adjusting the shape
30 cutting chain 20, compressing the restoring springs 8 and
of the endless cutting chain.
pushing the supporting rods 7 into the supporting tubes
The speci?c objects and advantages will become ap
6 by the arms 9 of said main body.
parent from a consideration of the following description.
When the bottom portion of the cutting chain 20 reaches
In the accompanying drawings:
the timber 27, the chisel links 21 and the saw links 22
FIG. 1 is an elevational view of a timber perforating
machine according to my invention;
35 successively and respectively chisel and saw the timber,
thereby perforating it and making a rectangular hole in it.
When the operating handle .26 is released, the main
FIG. 2 is a plan view of the machine;
FIG. 3 is a sectional side view of the machine taken
body 10 as well as the cutting chain 20 restore auto~
along the line A—A in FIG. 1;
FIG. 4 is a sectional side view of the machine taken
along the line B-B of FIG. 1;
matically to their original positions under in?uence of
the springs 8.
FIG. 5 is a sectioned elevational view of an endless
If the driving chain wheel 13 is moved in an upper
cutting chain part of the machine, one half being shown;
position by changing the location of the driving shaft 12
FIG. 6 is a partly sectioned side view of said part;
FIG. 7 is a sectional plan view of said part taken along
the line C—C in FIG. 5;
along the vertical slot 11 and at the same time each of
the side chain wheels 18 together with each of the bars
15 is moved in an inner position through the horizontal
slot (16, the quadrilateral cutting chain 20 will become
slender, whereby a shorter rectangular hole can be ob
Without further description it is thought that the fea
tures and advantages of the invention will be readily ap
parent to those skilled in the art, and it will of course be
FIG. 8 is a plan view of a chisel link;
FIG. 9 is a sectioned elevational view of said chisel
link taken along the line D--D in FIG. 8;
FIG. 10 is a plan view of a saw link; and
FIG. 11 is an elevational view of said saw link.
Like characters of reference indicate corresponding
parts throughout the views.
understood that changes in ‘form, proportion and minor
Referring to FIGS. 1-4, 11 denotes a machine frame hav
ing a pair of vertical supports 2 located in a suitable
space, each middle portion of which is formed to be a
rectangular side opening 3 for receiving a timber and is
provided with a screw 4 ‘for setting said timber. Firmly
details of construction may be resorted to, without de
parting from the spirit of the invention or the scope of
inserted in each vertical cylindrical portion 5 of the sup
wood or the like, comprising a frame having means for
the app-ended claims.
What I claim is:
1. Apparatus ‘for perforating a rectangular hole in
ports 2 is a hollow supporting tube 6 engaging with a 60 clamping a workpiece to be perforated therein, chain
mounting means mounted on said frame for reciprocal
supporting rod 7 telescopically under in?uence of a re
vertical movement thereon toward and away from the
storing spring 8. Each top end of said supporting rods is
position in which the workpiece is clamped in the frame,
secured to each horizontal arm 9 of a main body 10 which
an endless cutting chain mounted on said chain mounting
is thus movable in a vertical direction.
means and having saw and chisel means alternating along
The main body 10 has a vertical slot 11 at its upper
portion, through which slot a horizontal driving shaft 12
is adjustably secured to said main body. Rigidly ?xed to
chain mounting means having an apex at the lowermost
point thereof, said chain mounting means being adjust
the front end and the rear end of said driving shaft are
a driving chain wheel 113 and a driving pulley 14, re
Provided with the lower portion of the main body 10
are a pair of horizontal bars 15, each of them having 'a
the length of said chain, the path of said chain on said
able ‘for changing the horizontal dimension of said chain
path and altering the angle of the apex of the chain at
the lowermost point of the path of the chain, and means
on said chain mounting means adapted to be connected
to‘ driving means for driving“ said chain, whereby the
portion of the chain running‘past the apex of the path
of the chain will contact the workpiece in which the hole
is to be formed ?nst and the size of the cut will be grad~
ually elongated as the chain mounting means is moved,
downwardly toward the workpiece.
2; Apparatus as claimed in claim 1 in which said chain
mounting means comprises a plurality’ of atleast four
chain Wheels thereon, said chain wheels being arranged in,
mounting means further comprises‘ a mounting frame ‘and
said two further wheels are adjustably mounted for ‘ad
justment laterally of said frame, and at least one of the
‘wheels of the remaining wheels of the plurality of wheels
other than said ?rst wheel and said two remaining wheels
is adjustable toward ‘and away from said two wheels.
References Cited in the ?le of this patent
a pattern with‘ a‘?rst wheel at a lowermost point and two 10
vfurther wheels on the same level and abovethe lowermost
wheel, whereby the chain running over said ?rst wheel and
said'itwo further wheelsruns in a path forming the apex.
Bianca _______________ __ Aug. 2, 1927
Mohns _______ _;_‘___‘__.__ Dec.'27, 1932
Le‘Duc ____‘. __________ __ July 6, 1954“
3. Apparatus as claimed in claim 2 in which said chain
Young _______________ __ May 13, I890
Johnson ______________ __ Oct. 26, 1920
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