Improved Automatic Steam Brake and Gearing for Winding Engines at Collieries or other Mines.
Year: 1892

page_text: Date of Application, 14th Jan., 1892
Complete Specification Left, 13th Sept., 1892-Accepted, 3rd Dec., 1892
PROVISIONAL SPECIFICATION. .
Improved Automatic Steam Brake and Gearing for Winding Engines
at Collieries or other Mines.
JOSEPH DORMAN Marine Engineer 34 Kilvey Terrace St. Thomas' Swansea
Glamorganshire South Wales, do hereby declare the nature of my invention for
the object of diminishing risk of accidents through overwinding at collieries or
other mines to be as follows:-
My invention consists of a screw connected and worked. by means of spur or
worm wheels from winding shaft of engine, such screw being carried by standards.
Upon this screw travels a nut, between two guide bars, the travel of nut to
correspond with travel of cage in pit or shaft.
"..
Upon reaching a certain point on screw, the nut comes in contact with tappet
levers (which are connected by rods to throttle valve lever) and shuts off steam
from engine by closing the throttle valve; the nut still proceeding comes in contact
with other. tappet levers which put in motion. the slide. valve of steam brake and
lifting a small valve, admitting steam to brake cylinder, gradually tightening brake
as the cage nears the surface.
Should the cage ascend beyond a certain point of safety, a larger valve is
immediately opened and full boiler pressure applied to brake, consequently bringing
engines to a standstill.
1.
The brake may also be applied in case of necessity by the attendant in charge
of engines.
COMPLETE SPECIFICATION.
Improved Automatic Steam Brake and Gearing for Winding Engines
at Collieries or other Mines.
JOSEPH DORMAN Engineer 34 Kilvey Terrace St. Thomas' Swansea S. Wales,
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 :-
I do hereby declare the nature of my invention for :- -The object of diminishing
risk of accidents through overwinding at collieries or other mines to be as
follows:-
My invention consists of a screw connected and worked by means of spur or
worm wheels from winding shaft of engine such screw being carried by standards.
Upon this screw travels a nut between two guide bars, the travel of nut to corre-
spond with travel of cage in pit or shaft.
Upon reaching a certain point on screw, the nut comes in contact with tappet
levers (which are connected by rods to throttle valve lever) and shuts off steam
from engine, by closing the throttle valve.
The nut still proceeding comes in contact with other tappet levers, which put in
motion the slide valve of steam brake, and lifting a small valve, admitting steam
to brake cylinder; gradually tightening brake, as the cage nears the surface.
Should the cage ascend beyond a certain point of safety, a larger valve is
immediately opened, and full boiler pressure, applied to brake; consequently
bringing engines to a standstill. The brake may also be applied in case of necessity
by the attendant in charge of engines.

page_text: Figure 1. is a sketch or drawing of brake and gearing in elevation.
Figure 2. is an enlarged drawing of steam and valve chest in section.
My invention is applicable to winding engines of various types; and is worked
from main shaft A, of winding barrel or drum, by means of spur or worm wheels B, B',
one of which is fixed to a screw C, carried. at each end by standards F. Upon
screw C travels a nut E, between two guide bars D, D; the travel of nut E,
.corresponding with travel of cage in pit or shaft.
The nut E, travelling upon screw C, first, comes in contact with tappet
levers G, G; which are connected by rods I, and draws over the lever J, which, is
the throttle valve lever and shuts off steam from the engines.
The nut E, still proceeding, as the cage nears the surface; comes in contact with
other tappet levers H, H, which are connected by rods K, to lever L, lifting slide
valve M, and opening ports ready to admit steam.
As the valve spindle N, is being lifted; it opens a small valve O, (Fig. 2)
admitting steam gradually to brake cylinder P; thus preventing a sudden application
of brake.
When the cage ascends beyond a point of safety; the end of slide valve spindle N,
lifts the larger valve R, admitting full boiler pressure to brake; thus bringing
engines to a standstill.
The brake may be applied at will by means of lever S. This lever S, is also
connected by rod T, to foot lever V, and is applied to lift rod K, (fitted with gab
end) by means of lever S¹, connected to lever S, by rod T'; thus releiving brake,
when it has been applied automatically.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner, the same is to be performed, I declare that what I
claim is :-
1. Firstly-An arrangement of wheels, screw, and levers, as herein to fore
described and illustrated by accompanying drawings on Fig. 1.
2. Secondly-An improved valve box containing a double valve, by means of
which the brake is tightened gradually; thus preventing a too sudden application;
as illustrated by drawings on Fig. 2.
Dated this 10th day of September 1892.
JOSEPH DORMAN.