Improvements in Machines for Sawing Metal.
Year: 1890

page_text: COMPLETE SPECIFICATION.
Communicated from abroad by LEMBEL MEADER HAM, of Boston, Massachusetts,
United States of America, Manufacturer.
Improvements in Machines for Sawing Metal.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent Agents, 45,
Southampton Buildings, in the County of Middlesex, do hereby declare the nature of
this invention and in what manner the same is to be perforined, to be particularly
described and ascertained in and by the following statement:-
This invention relates to machines especially adapted for sawing cold metal of large
shapes, like beams, girders and the like, and it comprises a bed and clamps for
holding the work statio ary, a travelling frame for supporting a rotary saw or cutter,
a feel for controlling the movement of the travelling frame, and devices for rapidly
rotating the cutter or saw and arranged to travel with it.
It further relates to various details of construction and organization, all of which
will hereinafter be described.
In the accompanying drawings
Figure 1 is a view in side elevation of a machine embodying my invention.
Figure 2 is a view thereof principally in plan.
Figure 3 is a detail view in rear elevation representing especially the bed and feed
for the saw-carriage.
Figure is a view in longitudinal vertical section representing the saw, the saw
shalt. one of the racks on the saw-shift carriage, the gear which engages said rack,
and the connection between the saw shaft carriage and a swinging pulley.
Figure 5 is a sectional elevation showing the stationary and swinging hangers and
their connection.
In the drawings A represents the bed of the machine. This is mounted upon or
integral with the frame a, and it is made heavy and solid and has a flat surface a¹ for
the support of the work, dove-tail grooves a for holding work clamps a³, and a slit or
recess a extending from the back edge of the table forward to very nearly the front
edge, in which the cuiter or saw B is moved. The cutter or saw B is mounted upon
a short shaft b. This shaft has suitable bearings in the forward end of a sliding
carriage, which is horizontally movable in ways in the inner side of the frame a.
A portion of one of these ways is represented in full lines in Figure 2, and in
dotted lines in said figure, and also in full lines in Figure 3. The carriage is
provided with a horizontal movement by means of racks or rack-bars 63, formed in or
attached to its under surface. (See Figures 3 and 4.) The pinion on the shaft 65
mesh with the terth of the said rack-bars 63, the shaft having suitable bearings in the
frame a and being rotated by the bevel gear 6 (see Figures 1, 2 and 3) attached to its
front or outer end, and the bevel gear upon the operating-shaft meshes with
the gear . The shaft is supported by brackets and has a handle 10 which is
adapted to be turned by the operator to feed the carriage and saw horizontally in
relation to the stationary work. The saw is rotated by means of the belt C running
over a small puiley upon the shaft 6 (see Figure 2) to the large pulley c¹ upon the
hanging shaft c. This hanging shaft is suspended by swinging hangers (seo
Figures 1 and 2) and carries a small pulley cover which travels a driving belt c
extending to the larger pulley c, and this pulley c is carried upon a shaft c', which
also has a smaller pu ley driven by the belt running from a large pulley c¹ on
the main shalt c. The hanging or suspended shaft e² is connecte with the saw
carriage by means of the long links or arms c, (see Figures 1 and 2). It will be
seen that by this construction a movement imparted to the saw-carriage will also
cause the suspended or hanging shaft e², its pulleys, and the hangers to be easily
moved, and the saw or cutter to be advanced into its work without changing its

page_text: speed or in any way interfering with the relation between it and its primary driving-
pulley.
To provide suitable supports for the swinging hangers e³, I have arranged upon
each side of the hangers which carry the shaft c', additional hangers d. Each of
these hangers d has extending from the side adjacent to the hanger Da stud or
projection d', which preferably enters the hole of the box of the hanger D, and the
upper end of each swinging hanger c³ is mounted or carried by this stud. This
provides supports for the swinging hangers c³, which are not constantly rotating, and
secures better wear and less friction than where the swinging hangers e are mounted
upon the shaft carrying the pulleys.
In operation, the bem or other cold-metal structure to be sawed is firmly clampe
upon the bed a by suitable clamping devices, the line upon which it is desired to cut or
saw being over the slit or recess a. The saw or cutting tool, which is rotated at very
high speed, is, by the action of the feed-shaft 68, moved gradually against and through
the stationary beam. It will be observed that the bevei-gear upon the shift 8 is
considerably smaller than the bevel gear 66, and that the pinions are small
relatively to the bevel-ear so that the feed of the carriage and saw is quite
powerful and slow.
I prefer to partially cover the saw by a metal hood or covering E extending back-
ward from the rear end of the slit or recess a and the bed a'.
By means of this organization heavy cold-metal shapes can be very accurately and
quickly sawed or slit, and the metal shapes easily handled, as it is only necessary to
mount them upon the bed and clamp them in place, while the saw by a simple
feeding mechanism is moved against and into the shape so held.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me
by my foreign correspondent I declare that what I claim is :-
First. The combination in a metal sawing machine of a bed upon which the work
is mounted, and a horizontally movable carriage supporting a rapidly rotated saw or
cutting tool, and a feed for moving the carriage horizontally in relation to the bed,
substantially as described.
Second. The combination in a metal sawing machine of the bed A having the flat
surface a¹ and dove tail cross recesses a² for the reception of clamp bolts, said clamp
bolts, the slit or recess a formed in said table and the rotary saw B mounted upon a
carriage horizontally movable to cause the saw to traverse said slit or recess a³, sub-
stantially as described.
Third. The combination in a metal sawing machine of the hed A mounted upon the
frame a, the slide or carriage arranged to be moved horizontally in ways upon the
inner side of the frame, the shaft carried thereby, the saw B, and the feeding devices
comprising the rack-bars 3, pinions, shafts ³, bevel-gears 6, 7, and operating
shaft 8, substantially as described.
Fourth. The combination in a metal sawing machine of the bed A having means
for supporting and holding large metal shapes stationary, a saw-supporting frame or
carriage movable towards and from said bed, and a feed for effecting said movement,
hanging shaft carrying a driving and driven pulley connected by belts with a
driving pulley and with a driven pulley upon the smaller shift and with a saw
carriage by a link or hinge connection a*, as and for the purposes described.
Fifth. The combination in a machine of the character specified of the stationary
hangers D, the pulley shaft and the independent stationary hangers d, their studs ¹
for supporting the swinging hangers c³, and said swinging hangers, substantially as
described.
1
HASELTINE, LAKE & Co..
45, Southampton Buildings, London, Agents for the Applicant.