BRAKE ATTACHMENT FOR MACHINE TOOLS
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I JOHN DEWRANCE of 158 Great Dover Street Lambeth in the county of Surrey,
Engineer, do hereby declare the nature of my said invention for BRAKE
ATTACHMENT FOR MACHINE TOOLS to be as follows:-
This invention is specially applicable to Lathes & other machines whose
starting gear consists of a sliding bar parallel with the countershaft with forks
upon it which shift the strap from the loose to the fast pulley upon the counter-
shaft. Upon the countershaft I provide a 'disc which may be part of the speed
cone or may be separate according to circumstances & upon the sliding bar I fix
a brake block so that when the strap has been thrown on to the loose pulley the
brake block is pressed against the disc & stops the lathe by simply continuing.
the same motion of the lever or cord which actuates the sliding bar by which the-
strap is thrown on to the loose pulley.
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T T
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1001

page_text: I JOHN DEWRANCE of 158 Great Dover Street Lambeth in the county of
Surrey, Engineer, do hereby declare the nature of my invention for BRAKE
ATTACHMENT FOR MACHINE TOOLS, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement—
This invention is specially applicable to Lathes and other machines whose
starting gear consists of a sliding bar parallel with the counter shaft with a fork
upon it which shifts the strap from the loose to the fast pulley and vice versa.
Upon the counter shaft I provide a disc which may be part of the speed cone, or
may be separate according to circumstances, and upon the sliding bar I fix a brake
block so that when the strap has been thrown on to the loose pulley the brake
block is pressed against the disc and stops the lathe by simply continuing the same
motion of the lever or cord which actuates the sliding bar by which the strap is
thrown on to the loose pulley.
On the accompanying sheet of drawings Fig. 1 is a side elevation of a striking
'gear and countershaft to which my invention has been applied. Fig. 2. is a plan
with the strap running on the fast pulley, and Fig. 3. a plan with the strap
running on the loose pulley and the brake applied.-a is the sliding bar carrying
the fork b; c is the belt which drives the countershaft, d is the disc or wheel fixed
to the countershaft, and e is the brake block fixed on the sliding bar.
When the belt is. running on the fast pulley and driving the machine the brake
block is away from the disc d, as in Fig 2 but when the bar a is forced over so as
to shift the belt, on to the loose pulley the brake block is brought up against the
disc d, as in Fig 3 and a further pressure in the same direction stops the machine.
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 :
Firstly. The Brake Attachment for Machine tools consisting of a brake block
mounted on the striking bar and a disc on the countershaft substantially as
described.
:
J
Secondly The Brake Attachment for machine Tools substantially as described
and illustrated by the accompanying drawings.
Dated this 21st dor of Navamban 1001