An Improved Machine for Cutting or Shearing Metal Bars and the like.
Year: 1894

page_text: Date of Application, 21st Sept., 1894
Complete Specification Left, 21st June, 1895-Accepted, 27th July, 1895
PROVISIONAL SPECIFICATION.
An Improved Machine for Cutting or Shearing Metal Bars
and the like.
I, DANIEL MILLER BULL, of Bridge Street Verdi, Nevada, U.S.A., Inventor,
do hereby declare the nature of this invention to be as follows:-
The object of this invention is to provide a machine for cutting off short or
long lengths of metal. The invention comprises a suitable framework, consisting
of a base, an upwardly projecting standard upon the base, and a cross-piece at the
top of the standard. A suitable carriage is fitted to slide horizontally upon the
cross-piece. The carriage is formed with guides for a vertically reciprocating.
tool-holder fitted to slide therein and retain a cutting tool. The tool-holder is
vertically reciprocated by a cam mounted on the carriage aforementioned, and
having a long lever arm by means of which it may be partially rotated. The
upper end of the tool-holder is fitted with a friction-roller which engages the edge
of the cam and is retained in close contact therewith byla metal band forming a
loop which passes under the friction-roller.
The carriage is fed along the cross-piece aforementioned by a feed-screw, one
end of which is rotatably attached to the said carriage, and the other end passes
through a nut in the end of the carriage. The screw is rotated by a toothed wheel
secured thereon, and capable of being rotated at each reciprocation of the tool-
holder, by means of a pawl extending from the tocl-holder and having teeth which
engage the tooth or ratchet wheel.
Dated this 21st day of September 1894.
W. H. MUNNS,.
Applicant's Agent.
An Improved Machine for Cutting or Shearing Metal Bars
and the like.
I, DANIEL MILLER BULL, of Bridge Street, Verdi, Nevada, U.S.A. Inventor,
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 :-
My invention relates to machines for cutting or severing metal bars, and it
consists of substantially the construction and combination of parts, represented in
the drawings referred to, and particularly pointed out in the claims.
In the drawings Fig. 1 is a longitudinal vertical section of a machine constructed
in accordance with my invention, with a part of the operating lever and feed screw
omitted; Fig. 2 is a transverse vertical section of the same, taken on line x-x of
Fig. 1; and Fig. 3 is a detail view showing a nut for the feed screw composed of.
separable parts and a double cam for opening and closing the same.
A is the cutting, tool secured to a holder B which.. is reciprocated in a carriage;
or recessed block C. by the action of a cam.lever D pivoted to uprights c formed
[ Price &1

page_text: on the block. The cam E of the lever passes over and engages an antifriction
roller G journalled in ears at the upper end of tool-holder B so as to depress the
holder and cutting tool, and a metal strip or band F conforming to the shape of
the cam is secured to the lever and passes beneath and engages the under side of
the roller to raise the holder and tool.
The carriage or block C is formed with shoulders ce on its side that fit and
slide upon two rails H, H formed above the bed plate I of the frame.
J is a feed screw having a head at one end, rotatably secured to a socketed
plate K fastened to the carriage. The other end of the screw passes through a
hole in a cross piece or plate L, connecting the ends of rails H, and engages a nut
fastened to the cross piece. The hole in the cross piece is slightly larger than
the screw so that when it is desired to move the cutting tool back to a starting
point the screw may pass freely through the hole. The nut on the cross piece is
composed of two parts P, P, pivoted at p p and provided at their other ends with
pins QQ that are engaged by two oppositely shaped cam grooves R R formed in
a lever S fulcrumed to the cross piece. The cam grooves are so formed that when
the lever is moved in one direction the parts of the nut will be separated so as to
release the screw and when turned back the parts will come together again and be
firmly held by the cams. A ratchet wheel M rigidly secured to screw J is
engaged by a series of teeth n on a weighted pawl N pivoted to a bracket O on
the lower end of the reciprocating holder B. Spring T fastened at one end to the
block C and pressing at its other end against wheel M takes up any lost motion
between the block and screw. The series of teeth n extend a distance nearly equal
to the greatest length of stroke of the holder B so that one of the teeth of the
ratchet wheel will always be engaged by the teeth of the pawl on an upward
movement of the tool holder whether it be given a full or partial stroke and thus
it is not required that the lever D be always returned to the same point to effect
the feed. This obviously enables the machine to be used under circumstances that
could not be if the lever must be moved back to the limit of its stroke to cause
the feed.
I am aware that machines have been devised for cutting metal bars having parts
that act on the main principles of my machine and their use and mode of operation
are now well known. But by the particular construction and arrangement of
parts in my machine I obtain an exceedingly simple and compact organization of
such machines, enhance their use and durability, utilize to a greater extent the
power employed, and secure an improved and more certain and effective coaction
between the parts.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manuer the same is to be performed, I declare that what I
claim is :-
(1.) The combination with the guideway or rails H H and cross piece L, of the
carriage or block C movable on said guideway, lever D having cam E and strip F,
tool holder B reciprocable on carriage C and having antifriction roller G journalled
thereto and between cam E and strip F, feed-screw J having one end rotatably
secured to carriage C and the other engaging a threaded nut on the cross piece,
the said nut, ratchet wheel M rigidly secured to screw J, and a pawl N connected
with tool holder B and adapted to engage the wheel M, all substantially as shown
and described.
(2.) The combination with the guide-way or rails H H and cross piece L, of the
carriage or block C movable on said guideway, tool-holder B reciprocable on
carriage C, feed screw J having one end rotatably secured to the carriage and the
other engaging a threaded nut on cross piece L, the said nut composed of separable
parts, means for opening said parts and also for securing them together, ratchet
wheel M rigidly secured to screw J, and a pawl N connected with tool holder B
adapted to engage wheel M, all substantially as shown and described.

page_text: (3.) In combination, a guide-way, a carriage or block C movable on said guide-
way, a reciprocating tool holder B, feed screw J rotatably secured to said carriage,
ratchet wheel M rigidly secured to screw J, and a pawl N having a series of
teeth n to engage wheel M extending a distance about that of the maximum stroke
of the tool holder, substantially as shown and for the purpose set forth.
Dated this 21st day of June 1895.
W. H. MUNNS,
Agent for Applicant.