Improvements in Electric Motors and in their Application to Motor Carriages.
Year: 1898

page_text: Date of Application, 24th Aug., 1898
Complete Specification Left, 8th June, 1899-Accepted, 29th July, 1899
PROVISIONAL SPECIFICATION.
Improvements in Electric Motors and in their Application to Motor
Carriages.
We, THE BRITANNIA MOTOR CARRIAGE COMPANY LIMITED, of The Britannia
Motor Mills, Woodstock Road, Shepherd's Bush, in the County of Middlesex,
Manufacturers, and JOIN SMITH, in the employ of the said company, Engineer,
do hereby declare the nature of this invention to be as follows:-
These motors have stationary field magnets a rotating armature and gearing
arranged between the armature and the shaft upon which the whole is mounted.
The field magnets are securely bolted to a side plate which may be provided
with a long sleeve in which plate, or plate and sleeve, the axle or shaft rotates
freely. The armature with its commutator rotates freely on the shaft and is
provided with a sprocket pinion which is fixed to or forms part of the armature
boss and therefore also freely rotates on the shaft. On a gudgeon rigidly secured
to the opposite side plate rotates freely a sprocket wheel driven by a chain from a
sprocket pinion on the armature boss. Fixed to or forming part of the sprocket
wheel is a spur pinion which therefore also rotates freely on the gudgeon. The
pinion gears with a spur wheel provided with a long sleeve in which the axle
rotates freely. On the sleeve is keyed a drum shaped casing which encloses the
compensating gear and also by preference forms on the outside a brake drum
to receive a brake strap or the like. On the inside of the drum are rigidly secured
two radial pins on which freely rotate respectively bevel pinions each of which
gears simultaneously with two other bevel wheels. One of the latter bevel
wheels is keyed on the shaft to which shaft the carriage wheel is also keyed
thereby receiving motion from the motor. The other bevel wheel is secured
to or forms part of the nave of the carriage wheel which freely rotates on the
shaft and it thus independently of the carriage wheel receives motion from the
motor. The last named side plate is also provided with a long sleeve in which
the aforesaid spurwheel sleeve rotates freely. The side plates are rigidly attached
to each other by suitable distance pieces which may be the same bolts which
secure the field magnets to one of the side plates.
The side plate sleeves are provided with collars suitably secured by set screws
or the like. The collars are provided with guide rods which work vertically in
brackets fixed to the under framing of the carriage the collars and side plate
sleeves being thereby prevented from turning. The weight of the carriage is
supported and oscillation checked by an upper and lower helical spring which are
passed over the guide rods and act in compression between the collars and the
brackets.
The brushes are held up to the commutator by springs attached to a strip of
insulating material secured to the field magnets.
In place of the sprocket wheels we may also employ spur gear.
The whole motor is entirely enclosed but the circumferential thin sheet iron

page_text: cover or shield can be easily removed by undoing two screws. For larger motors
we make part of the shield hinged.
Oil cups are provided for lubricating the bearings in the sleeves of the side
plates, also an oil cup for lubricating the gudgeon.
The bearings may be formed separate from the field magnet casing especially
in cases where the carriage wheels are some distance apart. The motor casing
would then be held from turning by a bar or the like fixed thereto and to the
carriage springs or it might be to the collar or to one of the guide rods. Devices
for reversing the polarity may be fitted for large carriages. For such we also
prefer to employ two motors one on the inner side of each bearing, and the axle
would be stationary.
2000
COMPLETE SPECIFICATION.
Improvements in Electric Motors and in their Application to Motor
Carriages.
We, THE BRITANNIA MOTOR CARRIAGE COMPANY LIMITED, of The Britannia
Motor Mills, Woodstock Road, Shepherd's Bush, in the County of Middlesex,
and JOHN SMITIT, in the employ of the said company, Engineer, 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:
These motors have stationary field magnets a rotating armature and gearing
arranged between the armature and the shaft upon which the whole is mounted.
Fig. 1 is a rear elevation of a motor carriage showing the motor applied to
the hind axle thereof and Fig. 2 is a side view with one wheel and the compensa-
ting gearing removed, Figure 3 is an elevation partly in section of the motor
and compensating gearing to an enlarged scale and Figure 4 a vertical section
on the line 44 Fig. 3 with the outer casing removed showing the commutator
and brushes.
The field magnets A are securely bolted to a side plate B forming part of an
enclosing casing BB B2 provided in this example but not necessarily so with
long sleeves CC in which plates B and B₁ or plates and sleeves the axle or
shaft rotates freely. The armature E with its commutator F rotates freely
on the shaft D) and is provided with a sprocket pinion G which is fixed to or
forms part of the armature boss and therefore also free rotates on the shaft 1.
On a gudgeon H rigidly secured to the side plate B¹ rotates freely a sprocket
wheel J driven by a chain from a sprocket pinion G on the armature boss. Fixed
to or forming part of the sprocket wheel J is a spur pinion J which therefore
also rotates freely on the gudgeon H. The pinion J¹ gears with a spur wheel Ja
provided with a long sleeve J³ in which the axle D rotates freely.
On the sleeve J³ is keyed a drum shaped casing K which encloses the com-
pensating gear and also by preference forms on the outside a brake drum to
receive a brake strap K¹ (see Fig. 1) or the like. The compensating gear might
however be arranged in the casing. On the inside of the drum K are rigidly
secured two radial pins L' L2 on which freely rotate respectively level pinions
MM each of which gears simultaneously with bevel wheels N¹N. The bevel
wheel N is keyed on the shaft D to which shaft the carriage wheel Z' (see Fig. 1)
is also keyed thereby receiving motion from the motor. The bevel wheel N is
secured to or forms part of the nave 73 of the carriage wheel Z2 which freely

page_text: rotates on the shaft D) and it thus independently of the carriage wheel Z' receives
motion from the motor.
The side plates B B are provided with a long sleeve C¹, in which the sleeve J³
rotates freely.
The side plates B, B₁ are rigidly attached to each other by suitable distance
pieces which as shewn on the drawings may be the same bolts A¹ that secure the
field magnets A to the side plate B.
The sleeves C, C are provided with collars O Figs. 1 and 2 suitably secured
by set screws P or the like. The collars are provided with guide rods 01, 03
which work vertically in brackets Q1 Q2 fixed to the underframing R of the
carriage, the collars 0 and sleeves CC being thereby prevented from turning;
The weight of the carriage is supported and oscillation checked by upper and
lower helical springs S1, S2, respectively which are passed over the guide
rods 002 and act in compression between the collars O and the brackets Q¹, Q².
The brushes F are held up to the commutator F by springs F2 attached to a
strip of insulating material F3 secured to the field magnets A.
In place of the sprocket wheels G and J we may also employ spur gear.
The whole motor is entirely enclosed but the circumferential thin sheet iron
cover or shield B2 can be easily removed by undoing two screws B³ Fig. 2. For
larger motors we make part of the shield hinged.
TT are oil cups for lubricating the bearings in the sleeves CƠ¹. The oil
cup U is for lubricating the gudgeon H.
The bearings may be formed separate from the field magnet casing especially
in cases where the carriage wheels are some distance apart. The motor casing
would then be held from turning by a bar or the like fixed thereto and to the
carriage springs or it might be to the collar or the guide rods 01 or 02.
Devices for reversing the polarity may be fitted for large carriages. For such
we also prefer to employ two motors one on the inner side of each bearing and
the axle would be stationary.
in.
Low particularly described and ascertained the nature of our said
and in what manner the same is to be performed, we declare that what
we clan is:-
1. In an electric motor the combination of stationary field magnets fixed
between side plates of a casing or frame, an armature with its commutator and
with a pinion fixed thereto rotating freely on its shaft, gearing between the
pinion and a spurwheel rotating freely on the shaft, all the said parts. being
arranged within the casing or frame, and means for transmitting motion from
the spur wheel to the shaft, substantially as described and shown.
2. The construction of geared motor shown on the drawing.
3. The construction of motor axle spring bearings substantially as described
and shown.
4. The combination of the wheel J and the casing K with compensating gear
substantially as described and shown.
5. The construction and arrangement shown on the drawing of the motor as
applied to a motor carriage.
Tatadhi Thth de of T. 1800
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.