Year: 1889

page_text: Date of Application, 10th Dec., 1889-Accepted, 28th June, 1890
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 brakes operated by means of vacuum,
compressed air, steam, gas or any other suitable fluid.
'
The object of this invention is to provide a brake of this kind which can be readily
applied and which can easily be adjusted to compensate for the wearing off of the
tire.
The invention consists in the construction and combination of parts and details as
will be fully described and set forth hereinafter and finally pointed out in the
claims.
In the accompanying drawings
Figure 1 is a vertical transverse sectional view of this improved brake on the
line xx Figure 2.
Figure 2 is a vertical longitudinal sectional view of this improved brake..
Figure 3 is a horizontal sectional view on the line y-y Figure 2.
Figure 4 is a transverse sectional view on line v-v Figure 1.
Similar letters of reference indicate corresponding parts.
The cylinder or chamber A is provided with the side flange A¹. The flange A¹
extends beyond the top and bottom of the cylinder or chamber and also beyond
the front of the same as shown in dotted lines in Figure 2 and is provided at
both ends with apertures for receiving bolts for screwing it to the locomotive
frame. The cylinder or chamber A is provided with a head B provided at its
centre with a projection B₁ forming a central depression or recess in the inner
surface of said head. A diaphragm C made of rubber leather canvas or any other
suitable air tight material is clamped along its edges between the edges of the
cylinder or chamber A and the head B and rests on the inner surface of the front
of the cylinder or chamber. The piston D rests on the said diaphragın and is
provided at its centre with the tubular projection E extending in the direction
toward the head B on the centre of which projection a. stud or knob F is formed
around which one end of a helical spring F is placed the opposite end of the
helical spring which has greater diameter resting in the pocket or recess formed
in the inner surface of the cylinder head by the projection B' said spring bearing
against the piston and pressing the same against the diaphragm C. The piston D
is provided on its front side with two cylindrical projections H each having a longitu-
dinal slot H¹ extending from the piston to within a short distance from the outer end
of the projection said projections passing through suitable apertures provided for the
same in the diaphragm. These projections H also pass into elliptical or like pockets J
formed on the front of the cylinder or chamber A the side walls of which pockets are
connected by ribs or wings J¹ with the walls of the cylindrical compartment K formed
on the front of the cylinder and connected by a rib K' with the side flange A¹. In the
compartment K a hub L is placed which has a screw threaded bore and two opposite
external lugs M which pass into notches N¹ in the shorter ends of levers N pivoted by
bolts O between the ribs J¹ the opposite ends of said levers N projecting into the-
slots H of the projections H and resting on the inner surface of the outer end parts of
the projections. The bolts O pass through the ribs J¹ as shown in Figure 1..
Into the screw threaded bore of the hub La screw threaded block P is screwed
Price &

page_text: which is provided with a polygonal aperture for receiving one end of the polygonal
push pin the opposite end of which rests in a recess or groove in the back of the
brake shoe R. A packing ring S made of rubber or other suitable material is
countersunk in a groove in the opening of the block P and surrounds the push pin Q
and prevents undue rattling.
The brake shoe R is suspended from a curved link T pivoted to the shoe and
mounted to swing on a bolt U passed through the ribs A of the chamber or cylinder A.
The upper part of the back of the brake shoe rests against an adjusting screw W
screwed into the link T at the bend by means of which screw the shoe can be adjusted
to hang in the proper position in relation to the rim of the wheel. The cylinder or
chamber A is provided at the top and bottom with a neck d to which the pipe for
exhausting the air can be coupled this pipe being connected with the upper neck
the lower end being closed. Two necks are provided to permit of using the device on
either side of the wheels.
m is an aperture in the front of the cylinder for the passage of the air.
The cylinder or chamber A and the piston therein are advantageously curved and
made concentric with the wheel tire. This greatly facilitates fastening and securing
the said cylinder or chamber on the frame of the locomotive.
By slightly altering the construction and arrangement of parts the brake can be
operated by compressed air as well as by vacuum.
The operation is as follows:
Ordinarily the piston D rests against the diaphragm as shown in Figure 2.
When the air is exhausted from that part of the chamber A between the piston
and head B the exterior air acting on the piston presses the same in the direction
of the arrow Figure 2 and thereby the projections H are moved in the same
direction and pull those ends of the levers N within them also in the direction
of the arrow. Thereby the shorter ends of the levers N are moved in the
inverse direction and as they engage the hub they move said hub the block P
and the push pin Qin the inverse direction of the arrow and press the shoe R
against the rim of the wheel and at the same time the spring F is compressed.
When the vacuum is destroyed that is when the brakes are to be released the
weight of the brake shoe presses the push pin Q block P and hub L in the
direction of the arrow ¹ and thereby the piston D is moved in the inverse
direction of the arrow. The spring F assists in pressing the piston against
the diaphragm. The levers N multiply the power produced by exhausting the air
from the space between the piston D and head B and thus with a comparatively
small piston area very great power can be obtained.
As the shoe wears off the block P must be moved outward according to the wear of
the shoe. This is easily accomplished by turning the push pin by means of a
suitable key or other implement whereby the block P is also turned and screwed into
or out of the hub as the said push bar and the aperture in the block P for receiving it
are made polygonal.
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 I
claim is
1. The combination with a cylinder or chamber and a piston in the same of levers
pivoted within said cylinder or chamber and acted upon by the piston in said cylinder
or chamber substantially as set forth.
2. In a power brake the combination with a cylinder or chamber and a piston in
the same of levers pivoted on said cylinder or chamber and acted upon by the piston
and a bar acted upon by said levers substantially as set forth.
3. In a power brake the combination with a cylinder or chamber and a piston in the
same of lugs projecting from the piston levers pivoted on the cylinder or chamber
which levers project into said lugs a hub actuated by said levers and a push bar
actuated by said hub substantially as set forth.
4. In a power brake the combination with a cylinder or chamber and a piston in

page_text: the same of levers pivoted on said cylinder or chamber and acted upon by the piston
a hub acted upon by said levers a block mounted adjustably in the hub and a push bar
in said block substantially as set forth.
5. In a power brake the combination with a cylinder or chamber and a piston in the.
same of levers pivoted on said chamber or cylinder and an adjustable push bar actuated
by said levers substantially as set forth.
6. In a power brake the combination with a cylinder or chamber of a piston in the.
same levers pivoted on the cylinder or chamber and actuated by the piston a hub
actuated by said levers a block screwed into said hub and having a polygonal aperture
and a polygonal push pin in said block substantially as set forth.
7. In a power brake the combination with a chamber or cylinder and a piston in the
same of a hub mechanism for actuating said hub from the piston a block screwed into
said hub and having a polygonal aperture and a polygonal push bar in said aperture
substantially as set forth.
8. In a power brake the combination with a cylinder or chamber and a piston in the
same of a hub and mechanism for moving it from the piston a block in said hub
provided with a polygonal aperture a packing ring in said aperture and a polygonal
push bar passed through said packing ring and into the aperture in the block
substantially as set forth.
9. In a power brake the combination with a cylinder or chamber of a piston in the
same slotted lugs projecting from said piston levers pivoted on the cylinder or chamber
and having their ends passed into the slots in said lugs said levers having notches in
their opposite ends and a hub having opposite lugs that pass into notches in the ends
of the levers a block screwed into said hub and a push bar in said block substantially
as set forth.
10. In a power brake the combination with a cylinder or chamber and a piston in
the same of mechanism for operating a brake shoe from said piston a link for supporting
the brake shoe and of an adjusting screw screwed into said link and resting against the
back of the shoe substantially as set forth.
'
11. In a power brake the combination with a cylinder or chamber of a diaphragm
having two apertures a piston resting against said diaphragm and having two slotted
lugs passed through the apertures in the diaphragm pivoted levers having ends in the.
slots of the lugs, a hub engaged by the opposite ends of said levers and a push bar in
said hub substantially as set forth.
12. In a power brake a cylinder or chamber made in segmental shape and curved
on the same centre as the wheel tire substantially as set forth.
Dated this 10th day of December 1889
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.