Improvements in Saws or Sawing Devices for Cutting Metal Cold.
Year: 1899

page_text: Date of Application, 11th Mar., 1899-Accepted, 27th May, 1899
COMPLETE SPECIFICATION.
Improvements in Saws or Sawing Devices for Cutting Metal Cold.
I, ALBERT MERTZ, of 22, Forsterstrasse, Halle on Saale, in the Empire of
Germany, Locksmith, 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 saws or sawing devices for cutting metal cold, as at present employed
suffer from the drawback that, in consequence of their construction, they are
difficult to convey, and the article to be operated on must be conveyed to them.
This is particularly the case in the laying of railway rails, the erection of girders
on masonry in lofty scaffoldings and the like, said drawback being very inconvenient
and consuming a deal of time. Further, the saws hitherto employed require a great
deal of power, which renders difficult the general employment of such saws.
This invention has for its object to afford an easily transportable construction
of cold saw which is particularly characterized by being adapted to be clamped en
the article to be operated on, and by being capable of being adjusted in any suitable
manner, so that in the shortest time oblique or straight cuts may be made by it.
The adjustment of the saw may take place by means of adjustable spiral springs
or automatically.
In the accompanying drawings two forms of construction of this improved saw or
sawing device are shown,
Figure 1 being a side view;
Figure 2 an end view;
Figure a plan view of a saw in which the adjustment of the saw takes place by
means of adjustable screw springs.
Two uprights are arranged on a frame a, on which uprights two tubes e are
adjustably mounted. These two tubes are connected with one another by means
of a cross piece d. The lower end of each tube has a union e and in the two unions
the actual saw frame f g is mounted in such a way as to be capable of being moved
to and fro. The back of the saw frame is supported by a guide piece or roller h
attached to the cross piece . A pivoted lever i is arranged on one union e which
is connected by means of a link m with the
frame fg. The
frame de and the saw frame f g are pressed downwards by means
of chain wheels adjustably mounted on the upper end of the uprights b
and spiral springs s are located beneath said wheels n, so that the penetration of
the saw into the article to be operated on is facilitated. With the object of enabling
the chain wheels to be operated evenly or equally, they are connected with one
another by means of a chain r.
saw
is
The article to be operated on is placed on the raised part of the frame a and
fixed in any suitable manner, for instance by means of screwed loops or clamps y.
When this has been done, the saw is inserted from above and the lever
moved to and fro and gradually adjusted by means of the hand wheel z and chain
wheels which act as screw nuts on the threaded upper ends of the uprights, until
the article operated on is cut through.

page_text: The saw may however be arranged in such a way as to automatically adjust itself.
This form of construction is shown in Figures 4-6 in side, front and plau views
respectively. It is arranged in the same manner as the form of construction
shown in Figures 1-3 with some slight constructive modifications except as regards
the arrangement for its automatic adjustment.
For the purpose of the automatic adjustment of the saw, the uprights are made
thicker and tapered above to the threaded part so that between the tube c and the
threaded part, a free space remains available or unoccupied. On the upper end of
each tube e a sleeve is placed, both of which sleeves are connected with the cross
tube which is also of increased dimensions. The chain wheels », which serve
in the cross
as nuts and the springs are located in the sleeves and the chain
tube . Each chain wheel has a hub o projecting upwards, on one of which hubs
a ratchet wheel is located, whilst on the other hub a hand wheel
The lever carries an adjustable pawl u.
mounted.
The article to be operated on, such as a shaped piece of iron or rail 7, may be fixed
by means of clamps 7 and screws S in the frame a e. When the article to he
operated on is clamped firmly and the saws adjusted against the same by means of
the hand wheel and chain wheels, the pawl is moved downwards and the lever
is rocked to and fro. The latter at each to and fro movement encounters the
ratchet wheel and thereby the two chain wheels are moved step by step, that is
to say the saw is gradually adjusted by the frame c k m being gradually lowered
proportional to the cut effected.
The frame a instead of being made as shown in Figures 1-3 may be made quite
narrow as shown in Figures 4-6, in which case the clamp is only arranged to grip
that part from which the piece is to be sawn whilst the sawn-off piece falls off
freely.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1. A. cold saw or sawing device, comprising a frame (a) to be fixed on the article
to be operated on and provided with uprights (b), a tubular frame (ede) adjustable
up and down on the uprights by means of chain wheels and chain, and a saw mounted
in the tubular frame and adapted to be moved by means of a pivoted lever (i)
mounted in the frame (de), the whole with the object of enabling the cold saw to
be guided or brought in contact with the article to be operated on and to cut
through the same without it being necessary to remove the article from its place,
substantially as described.
2. A means for automatically adjusting the cold saw herein before described,
consisting of a ratchet (p) arranged on one of the chain wheels (=) and an adjustable
pawl () on the lever () in such a way that, at each reciprocatory movement of the
the chain wheels are gradually screwed downwards thereby adjusting the saw
downwards, substantially as described.
saw
,תותח
Jaat Maal 1900
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.