Year: 1897

page_text: Date of Application, 17th Sept., 1897
1000
1000
I, THOMAS CROWTHER, of Fernbank Drive, Bingley, in the County of York,
Draper, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in the brakes of railway trucks, and its
object is to provide a brake which can be readily and conveniently' applied and
instantaneously "taken off."
For this purpose I mount the brake shoes upon arms or rods inclined towards
each other in the form of "toggle levers" and I employ a cam and lever to bear
upon the centre of the toggle levers or a guide to which they are attached and
press the brake shoes against the wheels. The said arms forming the toggle levers
may be inclined upwards towards each other and the cam located above
them mounted on a fixing beneath the side of the body of the truck. In this case
the lever actuating the cam is curved or bent outwards so that it projects more
or less beyond the side of the truck. The ends of the toggle levers near to the
brake shoes may be supported on links and these links may be hung in such a
way that when the pressure of the cam is removed the brake shoes swing clear of
the wheels. Or a spring or springs or their equivalent may be used to draw the
shoes away from the wheels. The acting face of the cam may be notched or
stepped with a series of notches any of which fit the part it engages and prevents
the brake shaking off by the vibration.
Instead of the toggle lever arrangement the cam may be arranged to bear upon
an arm on the usual rocking shaft. Or the cam may be used in any other
convenient way to apply the brake.
Dated this 16th day of Sentember 1897
DRACUP & NOWELL,
Patent Agents, Bradford.
ирготещение m Drakes тог даnway iгискв.
I, THOMAS CROWTHER, of Fernbank Drive, Bingley, in the County of York,
Draper, 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 :-
This invention relates to improvements in the brakes of railway trucks, and its
object is to provide a brake which can be readily and conveniently applied and
instantaneously taken off."

page_text: To fully describe my invention, reference is made to the accompanying sheet of
drawings forming a part of this specification, in which similar letters of reference
indicate corresponding parts in each of the figures.
Figure 1 represents a side elevation of such portions of a truck as are necessary
to illustrate the application of my improvements.
Figure 2 is a plan view of the same.
Figure 3 is a cross section of a portion of the mechanism on the line a b
Figure 1.
To carry out my invention I connect the brake shoes A. and A² to rods or
arms B and B coupled together in the middle by the pin C and inclined towards
each other in the form of a toggle lever. The shoes are suspended from the
framework D of the truck by pendant links E, E placed at such an angle that the
weight of the shoes normally keeps them clear of the wheels F.
Above the junction of the rods B and B a cam shaft H is mounted in
hangers G, G secured to D and this shaft has a hand lever J secured on each
end. The cam K is fixed on H and is made with a curved eccentric rib L ou
each side and jaws or hooks N, N are provided on the rod B to engage these ribs
consequently when the cam is turned by one of the hand levers in the direction
of the arrow Figure 1 the cam lifts the coupled ends of the said arms towards the
shaft H and thus forcing their other ends outwards applies the brake which
remains on " until released.
66
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
The combination with the brake shoes of rods coupled to such shoes and
arranged in the form of a toggle lever, and a cam adapted to operate such rods
to apply the brake, substantially as herein shown and described.
Dated this 15th day of June 1898.
DRACUP & NOWELL,
'Patent Agents, Bradford.