Improvements in Electromotors especially applicable to Motor Carriages and other Vehicles.
Year: 1896

page_text: Improvements in Electromotors especially applicable to Motor
Carriages and other Vehicles.
I, JOHN VAUGHAN-SHERRIN of 3 Codrington Villas Ramsgate in the County
of Kent Electrical Engineer do hereby declare the nature of this invention to
be as follows:-
In Fig. 6 of my Patent Specification No. 19605 of 1895 is shewn a kind of
electromotor having the armature rotating freely on the shaft and having also
the field magnet free to rotate, the magnet and the armature being connected to
the shaft by wheel gearing which is enclosed in a casing that covers the whole
motor and is in one with the field magnet. Now according to my present inven-
tion I adapt this kind of motor to work the motor carriage at any desired speed at
the drivers option. For this purpose I interpose a clutch or ratchet gear between
the shaft and the last of the train of wheels connecting the field magnet to the
shaft, and I apply a brake or catch to the field magnet or its outer casing. The
driver is thus enabled either to stop the field magnet from rotating or to slow
it down to any desired degree. If the armature is keyed to the shaft and rotates
with it, and the gearing is applied only between the field magnet and the shaft
an even greater variation of speed is obtained and such an arrangement would be
suitable for large vehicles. The brake is by preference a friction band brake
actuated by hand or foot, convenient to the driver.
In adapting the arrangements Figs. 12 and 3 of my said specification to my
present purpose I unkey the field magnet drum or enclosing casing from the shatt
and attach to it between it and the bearing an additional close case containing
gearing and clutch for the field magnet; the said gearing connects the field magnet
to the shaft through the clutch and forms an attachment applicable to existing
machines.
1
1000

page_text: Improvements in Electromotors especially applicable to Motor
Carriages and other Vehicles.
I, JOHN VAUGHAN-SHERRIN of 3 Codrington Villas Ramsgate in the County
of Kent Electrical 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:-
In Fig. 4 of my Patent Specification No. 19605 of 1895 is shewn a kind of electro-
motor having the armature rotating freely on the shaft and having also the field
magnet free to rotate, the magnet and the armature being connected to the shaft
by wheel gearing which is enclosed in a casing that covers the whole motor and is
in one with the field magnet; the gearing is at each end connected to a stationary
jart forming a bearing for the shaft.
Now according to my present invention I adapt this kind of motor to work the
motor carriage at any desired or required speed at the drivers option by the mere
use of a brake lever or other convenient means. For this purpose I interpose a
selfacting ball or roller clutch or ratchet gear between the shaft and the last of
the train of wheels connecting the field magnet to the shaft, and I apply a brake
or friction clutch to the field magnet or its outer casing. By actuating this brake
or friction clutch the driver is enabled either to stop the field magnet from rotating
(when the maximum speed of motor shaft is desired) or to slow it down to any
desired degree. When the hand worked brake or clutch is entirely "off" the
speed is at its lowest.
Fig. 1 of the accompanying drawings is a longitudinal section and Fig. 2 a
cross section on line a .
The motor shaft B has fixed upon it the tooth wheels K' and K2. The sleeve D
is free to rotate thereon and upon this sleeve is fixed the armature C. The sleeve
is provided with two arms D' in the outer eyes of which are fixed the gudgeons G
and G upon which the double pinions FL are free to rotate. The field magnet
carries other gudgeons G and G for pinions F¹ and L' to rotate freely thereon.
The pinions gear with the wheels K and H¹ and K2 and H2 respectively. The
wheels H H are fast on the sleeves H H which are stationary, being held by
set screws I or other means in plummer blocks standards or brackets I of any
suitable form that are fixed to some part of the carriage frame. The sleeves H
thus form bearings for the shaft B. The parts described so far are like those
described with reference to Fig. 4 of my aforesaid patent specification. But I
now according to my present invention provide the tooth wheel K3 with a clutch
such for instance as the well known ball clutch shewn in end view in Fig. 2 anl
which consists of a wheel M somewhat like a ratchet wheel fixed on the sleeve D
and provided with loose balls N or rollers which when the wheel K rotates in one
direction is free of the clutch wheel M but when rotated in the opposite direction
is held fast by it. One end of the casing P is formed with a cone ring Q. R is
a cone sleeve capable of being engaged therewith by means of a fork lever; the
sleeve R can slide along a feather R¹ on the sleeve H. Instead of such a cone
brake I may use a band brake or any other brake for the purpose of retarding the
speed of rotation of the casing P and consequently that of the field magnet to any
desired extent or stop it altogether. The more it is retarded the greater the speed
of the motor shaft B; when the field magnet is rendered stationary the speed is at
its maximum.
Having now particularly described and ascertained the nature of my said in-

page_text: vention and in what manner the same is to be performed, I declare that what I
claim is:
1. The application and use in connection with an electric motor of the character
described of a self acting ball, roller, or other clutch and of a brake actuated by
the driver for retarding or stopping the rotation of the field magnet and thus
increasing the speed of rotation of the motor shaft, to the desired extent,
substantially as set forth.
2. The construction of electric motor shewn on the drawing.
Dated this Cintronth dox of Iun 1807
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents.