Improvements in Machine for Sawing Metal.
Year: 1892

page_text: Date of Application, 6th July, 1892
Complete Specification Left, 9th Jan., 1893-Accepted, 11th Feb., 1893
PROVISIONAL SPECIFICATION.
[Communicated from abroad by CHARLES SPOFFORD, of No. 312, East 22nd
Street, New York City, County, and State, Gentleman.]
Improvements in Machine for Sawing Metal.
I, WILLIAM HENRY BECK, of 115 Cannon Street, in the City of London,
Consulting Engineer and Patent Agent do hereby declare the nature of this inven-
tion to be as follows:-
or back
My invention relates more particularly to machines for sawing metal, in which
the saw has a vibratory or reciprocating motion, and consists of such mechanisms
and devices as shall lift the saw from the metal, during the return
stroke; thereby saving the cutting edges of the saw teeth from much useless wear
and conducing to quicker and better results in cutting on the forward stroke, and
also to greater durability of the saw.
In the accompanying drawings,
Figure 1 is a plan of a metal sawing machine with my improvement.
Figure 2, is a side elevation of the same.
Figure 3 is a vertical section on line X, X.
"
The same letters refer to the same parts. In machines for sawing metals which
use a reciprocating saw or cutter, the saw should have sufficient weight or pressure
on the work, to make it "bite or cut well on the forward stroke; but should be
lifted or relieved of such pressure on the return or non-cutting portion of the
movement. I attain this result by means of the following mechanism: The saw S
is mounted upon a sliding carriage s, which travels to and fro on a swinging
arm B, and can be raised and lowered therewith. The arm B is fitted to swing or
rotate around a sleeve or bushing b, which surrounds the driving shaft D, and acts
as the journal box thereof. The bushing is supported in bearings or pillar
The shaft D carries at one
blocks a a, on the bed A, to which they are secured.
end the crank which gives the necessary reciprocating movement to the saw S,
by means of the connecting rod, or pitman g.
The periphery of the crank plate is formed into a cam d¹ which by its revolution
oscillates the lever C which is hung upon a suitable pedestal a¹ on the bed A.
Upon the swinging arm B is a projection 6 having a curved surface, the curvature
of which is concentric with the arm B and bushing b, as shown; to this curved
surface is fitted a, friction shoe, or clutch c, which is secured to a carrier c¹, in such
a manner that the pressure of c upon may be regulated by a set screw c³, provided
in the carrier c².
The carrier c is hung by flexible joints, first at its lower end to the lever C, as
shown, and at its upper end by two connecting rods c³, c³ to a pedestal a³, secured
upon the bed A. The operation of this arrangement is such that when the cam d¹
depresses the one end of the lever C, the other end thereof, in lifting first closes the
shoe c, firmly upon the surface of ', and then lifts both together, thus lifting the
arın B and with it the saw frame s, and saw S, and holding them in the lifted
position until the cam d¹ permits the whole to drop, when the shoe c, leaves the
surface of 6 permitting the whole to drop until the saw S, is in contact with the
material to be acted upon. Thus at each succeeding stroke the shoe c, takes a new
hold of 6 at whatever level it may be, and lifts it a definite distance while the saw
is upon the back stroke. A spring ct, is provided to keep the lever C up to the
cam d². Under the bed A, is hung a lever E, having an adjustable weight e, and
projection et as shown, the end of passing up through an opening provided in the
bedplate A acts upon the end of b', tending to lift the same and by means of the

page_text: adjustable weight e, regulates the proper degree of pressure of the saw S, upon
the work, and also assists the action of the lever C, and shoe c, as desired. A saw
guide s is secured to the swinging arm B.
The material to be operated upon is secured in a vice a³ a*, by means of a screw a.
The construction of this mechanism, as above described, is such that when the
material is cut, the swing arm B and saw S, may be lifted entirely out of the way,
while placing the material, and adjusting the vice ³, a, without any reference to
the rest of the machine, falling back to its proper relation to the shoe c, and
projection e without any preparation or manipulation of those parts whether the
material to be operated upon is in itself large or small. The shaft D, which by
means of the crank d actuates the saw S, and by means of the cam d' actuates the
lifting mechanism as described is rotated by means of the pulley d, or a crank or
gear as may be preferred.
Dated thin cl
T 1
1000
W. H. BECK,
115, Cannon Street, London, E.C., Applicant.
COMPLETE SPECIFICATION.
Improvements in Machine for Sawing Metal.
I, WILLIAM HENRY BECK, of 115 Cannon Street, in the City of London,
Consulting Engineer and Patent Agent 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, that is to say :-
My invention relates more particularly to machines for sawing metal, in which
the saw has a vibratory or reciprocating motion, and consists of such mechanisms
and devices as shall lift the saw, from the metal, during the return or back stroke;
thereby saving the cutting edges of the saw teeth from much useless wear, and
conducing to quicker and better results in cutting on the forward stroke, and also
to greater durability of the saw.
In the drawings, accompanying the Provisional Specification,
Figure 1, is a plan of a metal sawing machine with my improvement.
Figure 2, is a side elevation of the same.
Figure 3, is a vertical section on line X, X.
The same letters refer to the same parts. In machines for sawing metals which
use a reciprocating saw or cutter, the saw should have sufficient weight or pressure
on the work to make it "bite" or cut well on the forward stroke; but should be
lifted or relieved of such pressure on the return or non-cutting portion of the
movement. I attain this result by means of the following mechanism: The saw S
is mounted upon a sliding carriages which travels to and fro on a swinging arm B,
and can be raised and lowered therewith. The arm B is fitted to swing or rotate
around a sleeve or bushing, which surrounds the driving shaft D and acts as the
journal box thereof. The bushing is supported in bearings or pillar blocks a, a,
on the bed A, to which they are secured. The shaft D carries at one end the
crank & which gives the necessary reciprocating movement to the saw S, by means
of the connecting rod, or pitman g.
The periphery of the crank plate is formed into a cam d', which by its revolution
oscillates the lever ( which is hung upon a suitable pedestal a' on the bed A.
Upon the swinging-arm B is a projection having a curved surface, the curvature
of which is concentric with the arm B and bushing b, as shown; to this curved
surface is fitted a friction shoe or cloth c, which is secured to a carrier c,.in such a
manner that the pressure of c upon b¹, may be regulated by a set screw c³ provided
in the carrier c¹.
The carrier c¹ is hung by flexible joints, first at its lower end to the lever C, as
shown, and at its upper end by two connecting rods c³, c³, to a pedestal a³, secured
upon the bed A. The operation of this arrangement is such that when the cam d

page_text: depresses the one end of the lever C, the other end thereof in lifting, first closes
the shoe firmly upon the surface of 61, and then lifts both together, thus lifting
the arm B and with it the saw frames and saw S, and holding them in the lifted
position until the cam d, permits the whole to drop when the shoe c leaves the
surface of 6 permitting the whole to drop until the saw S is in contact with the
material to be acted upon. Thus at each succeeding stroke the shoe c takes a new
hold of at whatever level it may be, and lifts it a definite distance while the
saw is upon the back stroke. A spring is provided to keep the lever C up to
the cam d'. Under the bed A is hung a lever E having an adjustable weight e and
projection e', as shown, the end e¹ passing up through an opening provided in the
bed-plate A acts upon the end of 6, tending to lift the same and by means of the
adjustable weight e, regulates the proper degree of pressure of the saw S, upon
the work, and also assists the action of the lever C, and shoe c as described. A
saw guides, is secured to the swinging arm B.
The material to be operated upon is secured in a vice a³, a by means of a
screw a. The construction of this mechanism as above described is such that
when the material is cut, the swing arm B and saw S may be lifted entirely out of
the way while placing the material, and adjusting the vice a³, a', without any
reference to the rest of the machine, falling back to its proper relation to the
shoe c, and projection e¹, without any preparation or manipulation of those parts
whether the material to be operated upon is in itself large or small. The shaft D
which my by means of the crank d actuates the saw S, and by means of the cam d¹
actuates the lifting mechanism as described is rotated by means of the pulley ď²,
or a crank or gear as may be preferred.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, 1 declare that what I
claim is :
1. In a machine for sawing metal, the cam d' and lever C, in combination with
the adjustable shoe c connecting rods c³, c³, and swing arm B, having the curved
surface when constructed and operated, substantially as and for the purposes
herein shown and set forth.
2. In a machine for sawing metal, the swing arm B carrying the sliding
carriages and saw guide s', and having the projection b¹ in combination with the
projection el and lever E having an adjustable weight e and also the friction shoe c,
lever C, spring c¹, and cam d', when constructed and operated substantially as and
for the purposes herein shown and set forth.
3. In a machine for sawing metal, the method of lifting the saw upon each return
stroke by means of the cam d', in combination with the crank d and connecting
rod 9, substantially as herein shown and described.
4. In a machine for sawing metals, the swing arm B having a bushing b in
combination with the shaft D, and pillar blocks a, a, substantially as herein shown
and set forth.
5. In a machine for sawing metal, the saw lifting cam d' when constructed and
operated substantially as herein shown and described.
F1 1 At Ta
1002
W. H. BECK,
115, Cannon Street, London, E.C., Applicant.