An Improvement in Heberlein Brake Apparatus.
Year: 1890

page_text: Date of Application, 3rd Sept., 1890-Accepted, 11th Oct., 1890
COMPLETE SPECIFICATION.
[Communicated from abroad by FRITZ VON NAGEN, of No. 29, Plau Ufer, Berlin,
in the German Empire, Engineer.]
An Improvement in Heberlein Brake Apparatus.
I, CHARLES FAIRHOLME of No. 18 St. Dunstan's Hill, in the City of London, Captain
in the Royal Navy, 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 apparatus of the kind known as Heberlein brake apparatus
for railway trains or tramway cars. In this apparatus. a drum, brought when
desired, in contact with a drum on one of the running axles is made to revolve by
friction, and to cause the winding up of a chain, whereby the brakes are put on. The
present invention consists in a modification of such apparatus, whereby when the
brakes are put on by the frictional action above referred to, they are held on as long
as may be desired without continuance of this frictional action, the wear of the friction
drums being thus greatly lessened.
Fig. 1 is a side view and
Fig. 2 an end view of so much of a Heberlein brake apparatus as is necessary to
illustrate the present invention.
A is one of the running axles on which is fixed the drum B. On a bent lever D
is mounted the friction drum C which can be brought in contact with B when desired
by lowering the lever a. The drum C being thus caused to revolve by frictional
contact with B unwinds a chain E from a roller i thus causing the roller to revolve
and to draw a chain & which is connected to the brake levers, thus putting on the
brakes. In order to take off the brakes, the lever a is raised thus withdrawing C
from contact with B and leaving it and the roller i free to revolve, slackening the
chain and allowing the brake blocks to be taken off the wheels by suitable counter-
weights or springs.
The apparatus so far described is of the known Heberlein kind which, according to
this invention, is modified in the following manner. To the lever a, besides the arm b
which tightens the chain m and thereby withdraws the drum C from contact with B,
is attached another arm c connected by a rod d to an arm e on a rocking shaft h
mounted on brackets 9 projecting down from the underframing of the carriage.
On the shaft his fixed a cam pawlf facing the roller i. When owing to the descent
of a the roller i is caused to revolve in the direction of the arrow, its periphery
slides easily past the cam f as it strains the chain & putting on the brakes; but,
the brakes being thus put on, the strain of k tends to make the roller i turn in the
opposite direction and to bite on the cam f.
Owing to the eccentricity of the face of the cam f, when it is thus caused partly
to turn, it pushes i somewhat away to the left and, as is on the same framing D
with i, it is thus moved out of contact with B, so that there is no longer any friction
or wear of the surfaces of B and C, the brakes being however kept on by the cam f,
acting as a friction pawl against the periphery of i.
When the brakes are to be taken
off, the lever a is raised and thus by the arm c, the rod d and the arm e, the cam
is moved away from i at the same time that is moved away from B the drum i and
chain k being thus left free.
f
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what 1
claim is :-
In combination with the chain drawing roller of Heberlein brake apparatus a cam

page_text: pawl moved to and from the said roller by the same lever which brings the brake
apparatus into and out of action, substantially as and for the purpose sot
forth.
TEL. D.
1000
ABEL & IMRAY,
Agents for the Applicant.