Year: 1899

page_text: Date of Application (in United Kingdom), 15th Dec., 1899
Complete Specification Left, 14th Sept., 1900-Accepted, 10th Nov., 1900
I, EGBERT MOORE TINGLEY, of Amber Club, Pittsburgh, in the County of
Allegheny and State of Pennsylvania, United States of America, Electrical
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to electric brakes for rotating shafts, and has for its object
to provide an improved device which will act to permit the operation of the brake
setting mechanism when the circuit through which electrical energy is supplied
to the brake magnets is open.
The construction of brake which I have in view comprises an arrangement in
which means such as springs act to normally set the brakes and thereby prevent
the shaft from rotating, but when an electric current is supplied to electromagnets
forming part of the brake mechanism the brake setting means is withdrawn, and
the shart thereby permitted to rotate.
My invention is intended for use with polyphase electric currents, and is
characterized by the provision of electromagnets with a plurality of coils through
which polyphase currents are passed; the armatures of said electromagnets being
arranged to act in the same line in opposition to the brake setting mechanism.
In the accompanying drawing:-
Figure 1 is an end elevation partly sectional of my improved brake setting
and releasing mechanism applied to the shaft of a polyphase electric motor, and
Figure 2 is an end elevation of the motor shaft with the brake discs and
support, parts being broken away.
Figure 3 is a section on the line AB, Figure 1, and
Figure 4 is a horizontal section of the apparatus.
The shaft of the electric motor is shown at 3 and the motor casing or frame 4
affords a support for the brake and its operating mechanism. It is obvious that
the motor may be of any suitable construction.
The casing 5 for the brake is secured to the motor casing or frame 4 by arms (
and surrounds one end of the shaft 3. Said shaft has keyed to it a hub 7
provided with longitudinal grooves 9, four such grooves being shewn in the draw-
ing by way of example, and the inner periphery of the casing 5 is provided with
similar grooves 8. A number of annular plates 10 and 11 placed alternately
surround the hub 7, being provided with lugs 1 and 2 respectively engaging in
[Price 811

page_text: the grooves 8 and 9. By this it will be seen that the plates 10 are fixed while
the plates 11 rotate with the hub 7 and shaft 3.
The brake shewn in the drawings is intended to be operated with two-phase
currents, and the electro-magnets are two in number, the coils being shewn at 40
and 41. These coils are energized by currents which differ in phase and a magnetic
pull will therefore be exerted by the magnets at all times when the circuit is
closed. Each magnet core consists of two parts, one part being fixed, and the
other being movable. The fixed parts of the cores are made up of laminated
plates 28 and 31 which are contained in frames 27 and 26 respectively. These
frames are made in two parts secured together by bolts 29 and 32. The frame 27
is also bolted to the end plate 25 which is connected by the casing 44 with the
fixed casing 5, and the frame 26 is also connected to said casing through the
brackets 34. The two frames are furthermore rigidly connected by the bolts 35.
The movable parts of the cores of the electro-magnets are built up in a similar
fashion of the laminated plates 14 and 19 held in frames 13 and 18 by bolts 15
and 20. These frames are connected together through bars 21 and secured by
means of arms 16 and bolts 17 to an annular plate 12 which surrounds the hub 7
within the casing 5, but which is not secured in any way to either hub or casing.
The movable portions of the cores are further supported by means of the pins 3
passing through openings in extensions 22 of the frame 18, the outer ends of
the pins being seated in sockets in projections 24 formed on the inner side of
the end plate 25. Interposed between the plate 12 and the frame 27 are two coiled
springs 36 and 37 the ends of which are supported by pins 38 and 39 projecting
from brackets bolted to the plate 12 and frame 27. These coiled springs normally
force the plate 12 against the discs 10 and 11, thereby pressing said discs together
and preventing rotation of the shaft 3 relatively to the casing 5. When, however,
out-of-phase currents are supplied to the coils 40 and 41 the movable portions 14
and 19 of the cores will be attracted towards the fixed portions 31 and 28 with-
drawing the plate 12 from the braking plates 10 and 11 against the pressure of
the springs 36, 37, and thereby permitting the shaft 3 to rotate.
The number of electromagnets will in general be varied according to the
number of phases of current one electromagnet coil being provided for each
phase of current, unless some system be employed for utilizing three-phase or
polyphase currents with two-phase apparatus, so that two magnets will be suffi-
cient in every case. The magnets are always arranged so that they exert a pull
in the same direction upon their armatures and brake releasing apparatus.
My invention is intended more especially for use when the shaft 3 is rotated
by means of a polyphase electric motor, the electromagnets of the brake releasing
mechanism being placed either in shunt or in series with said motor. By this
means, when the supply of current is cut off from the motor the magnets will be
de-energized, and the coiled springs will cause the brakes to be applied and
thereby stop the rotation of the motor shaft.
DL 151
T
1
1000
I, EGBERT MOORE TINGLEY, of Amber Club, Pittsburg, in the County of
Allegheny and State of Pennsylvania, United States of America, Electrical
Engineer, do hereby declare the nature of this invention and in what manner

page_text: the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
My invention relates to electric brakes for rotating shafts, and has for its object
to provide an improved device which will act to permit the operation of the brake
setting mechanism when the circuit through which electrical energy is supplied
to the brake magnets is open.
The construction of brake which I have in view comprises an arrangement in
which means such as springs act to normally set the brakes and thereby prevent
the shaft from rotating, but when an electric current is supplied to electro-magnets
forming part of the brake mechanism the brake setting means is withdrawn, and
the shaft thereby permitted to rotate.
My invention is intended for use with polyphase electric currents, and is
characterised by the provision of electro-magnets with a plurality of coils through
which polyphase currents are passed; the armatures of said electro-magnets being
arranged to act in the same line in cpposition to the brake setting mechanism.
In the drawings accompanying my provisional specification,
Figure 1 is an end elevation partly sectional of my improved brake setting
and releasing mechanism applied to the shaft of a polyphase electric motor, and
Figure 2 is an end elevation of the motor shaft with the brake discs and
supports, parts being broken away.
Figure 3 is a section on the line A-B, Figure 1 and
Figure 4 is a horizontal section of the apparatus.
The shaft of the electric motor is shown at 3 and the motor casing or frame 4
affords a support for the brake and its operating mechanism. It is obvious that
the motor may be of any suitable construction.
The casing 5 for the brake is secured to the motor casing or frame by arms 6
and surrounds one end of the shaft 3. Said shaft has keved to it a hub 7
provided with longitudinal grooves 9, four such grooves being shown in the draw-
ing by way of example, and the inner periphery of the casing 5 is provided with
similar grooves 8. A number of annular plates 10 and 11 placed alternately
surround the hub 7, being provided with lugs 1 and 2 respectively engaging in
the grooves 8 and 9. By this it will be seen that the plates 10 are fixed while
the plates 11 rotate with the hub 7 and shaft 3.
The brake shown in the drawings is intended to be operated with two-phase
currents, and the electro-magnets are two in number, the coils being shown at 40
and 41. These coils are energised by currents which differ in phase and a magnetic
pull will therefore be exerted by the magnets at all times when the circuit is
closed. Each magnet core consists of two parts, one part being fixed, and the
other being moveable. The fixed parts of the cores are made up of laminated
plates 28 and 31 which are contained in frames 27 and 26 respectively. These
frames are made in two parts secured together by bolts 29 and 32. The frame 27
is also bolted to the end plate 25 which is connected by the casing 44 with the
fixed casing 5, and the frame 26 is also connected to said casing 5 through the
brackets 34. The two frames are furthermore rigidly connected by the bolts 35.
The moveable parts of the cores of the electro-magnets are built up in a similar
fashion of the laminated plates 14 and 19 held in frames 13 and 18 by bolts 15
and 20. These frames are connected together through bars 21 and secured by
means of arms 16 and bolts 17 to an annular plate 12 which surrounds the hub 7
within the casing 5, but which is not secured in any way to either hub or casing.
The moveable portions of the cores are further supported by means of the pins 2
passing through openings in extensions 22 of the frame 18, the outer ends of
the pins being seated in sockets in projections 24 formed on the inner side of
the end plate 25. Interposed between the plate 12 and the frame 27 are two coiled
springs 36 and 37 the ends of which are supported by pins 38 and 39 projecting
from brackets bolted to the plate 12 and frame 27. These coiled springs normally
force the plate 12 against the discs 10 and 11. thereby pressing said discs together
and preventing rotation of the shaft 3 relatively to the casing 5. When, however,

page_text: out-of-phase currents are supplied to the coils 40 and 41 the moveable portions 14
and 19 of the cores will be attracted towards the fixed portions 31 and 28 with-
drawing the plate 12 from the braking plates 10 and 11 against the pressure of
the springs 36, 37, and thereby permitting the shaft 3 to rotate.
The number of electro-magnets will in general be varied according to the
number of phases of current one electro-magnet coil being provided for each
phase of current, unless some system be employed for utilizing three-phase or
polyphase currents with two-phase apparatus, so that two magnets will be suffi-
cient in every case. The magnets are always arranged so that they exert a pull
in the same direction upon their armatures and brake releasing apparatus.
My invention is intended more especially for use when the shaft 3 is rotated
by means of a polyphase electric motor, the electro-magnets of the brake releasing
mechanism being placed either in shunt or in series with said motor. By this
means, when the supply of current is cut off from the motor the magnets will be
de-energized, and the coiled springs will cause the brakes to be applied and
thereby stop the rotation of the motor shaft.
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:-
1. An electric brake having means such as springs for automatically setting
the brake and a releasing device comprising a plurality of polyphase electro-
magnets provided with armatures which are connected to the brake setting means
so as to act in opposition to said means when current is supplied to the electro-
magnets.
2. An electric brake for use with a rotary shaft in which a plurality of non-
rotatable friction plates are placed alternately with a plurality of plates rotating
with the shaft and brake setting means such as springs are provided for normally
forcing the two sets of plates into braking engagement such means being con-
nected to the armatures of the releasing electro-magnets all of which are arranged
to act in the same line in opposition to the brake setting means when the magnets
ale energized.
3. The brake setting and releasing mechanism constructed and operating sub-
stantially as described with reference to the drawings.
Dated this 14th day of September 1900.
F. W. LE TALL,
Chartered Patent Agent,
The Westinghouse Patent Bureau,
Westinghouse Building, Norfolk Street, Strand, London, W.C.