Improvements in and connected with Electrical Switches.
Year: 1898

page_text: Date of Application, 29th Mar., 1898
cification Left 29th Dec., 1898-Accepted, 11th Mar., 1899
PROVISIONAL SPECIFICATION.
Improvements in and connected with Electrical Switches.
We, HENRY CHARLES EDWARD JACOBY, Electrical Engineer, of 54, Bayham
Place, Camden Town, London, N.W., and WHITE, JACOBY and COMPANY, LIMITED,
f 54, Bayham Place, Camden Town, London, N.W., Electrical Engineers, do
hereby declare the nature of this invention to be as follows:-
The object of our invention is to control the starting of the electromotor
employed for operating passenger and like lifts or for other power purposes. To
this end the rope or strand employed for operating the lift passes over a grooved
pulley secured to a main shaft carrying an eccentric and a pinion gearing into
a reversing switch. When the electromotor is employed for the transmission of
power other than that described any suitable and equivalent operating mechan-
ism may replace the grooved pulley. The main shaft operates either directly or
by spur or like gearing a revolving reversing switch. The connecting rod coupled
at one end by a strap to the eccentric secured to the main shaft is connected at
the reverse end to a stud fixed in the side of a V pulley which runs loose upon
a stud or separate shaft. The throw of the eccentric and the radius of the stud
from the centre of the shaft carrying it being so adjusted that half a revolution
of the main shaft will turn the loose pulley less than one hundred and eighty
degrees.
It follows that if the main shaft is turned half a revolution in either direction
from the dead point (which is the normal position) the loose pulley will always
turn in a fixed direction. One end of a cord or strand is anchored to the loose
pulley, the other end of which after passing round a weight pulley is anchored
to another V pulley (which we call the switch pulley) concentric with and equal
in size to the loose pulley but fixed to a spindle carrying an arm which travels
over a number of contact blocks bridged with wire resistance coils or the like.
Two lugs on these pulleys engage with each other so that while the loose pulley
can turn forward without turning the switch pulley, the switch pulley cannot
turn until the loose pulley has turned and then only through an equal angle.
A pin fixed in the switch pulley works in a radial slot cut in a ratchet wheel
O concentric with the V pulleys, the length of the radial slot being so designed
as that the switch pulley can turn carrying with it the contact arm through an
angle equal to the break on the resistance switch, without turning the ratchet
wheel; in order to turn further, the switch pulley must carry round with it the
ratchet wheel. A pawl engaging with the teeth of the ratchet wheel is carried
35 on a spur wheel which can only turn by driving an escapement or equivalent
checking device.
The action of the switch is as follows:
When the pulley or its equivalent on the main shaft is turned half a revolution
in a clockwise direction, the reversing switch will be turned. At the same time
40 the eccentric rod will move forward, turn the loose pulley, wind up the cord, and
raise the weight. The other end of the cord being attached to the switch pulley
will turn it until checked by the ratchet wheel and will then continue turning

page_text: at a slow speed driving the escapement or other regulating mechanism. The
arm of the resistance switch is thus brought quickly on to the first block and
then travels slowly over the remaining blocks. When the main spindle is turned
back to the normal position the reversing switch will also be turned back to the
normal position and the eccentric rod will turn back the loose pulley which carries
back with it by means of the before mentioned lugs the switch pulley, this owing
to the ratchet action is able to turn in this direction without operating the
checking device. As both pulleys now turn together the weight will remain
stationary. When the main shaft is turned in a counter clockwise direction it
will be seen that while the reversing switch will move in the opposite direction
to that in which it moved before, the pulleys and resistance switch arm will
travel exactly as before. When the main shaft is turned back to normal position
both switches return to normal position as before.
Dated this 29th day of March 1898.
Improvements in and connected with Electrical Switches.
We, HENRY CHARLES EDWARD JACOBY, Electrical Engineer, of 54, Bayham
Place, Camden Town, London, N.W., and WHITE JACOBY and COMPANY LIMITED,
Electrical Engineers, of 54, Bayham Place, Camden Town, London, N.W., 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:
The object of our invention is to control the starting of the electromotor
employed for operating passenger and like lifts or for other power purposes. To
this end the rope or strand employed for operating the lift passes over a grooved
pulley secured to a main shaft carrying an eccentric and a pinion gearing into
a reversing switch. When the electromotor is employed for the transmission of
power other than that described, any suitable and equivalent operating mechan-
ism may replace the grooved pulley. The main shaft operates either directly or
by spur or like gearing a revolving reversing switch. The connecting rod coupled
at one end by a strap to the eccentric secured to the main shaft is connected at
the reverse end to a stud fixed in the side of a V pulley which runs loose upon
a stud or separate shaft. The throw of the eccentric and the radius of the stud
from the centre of the shaft carrying it being so adjusted as that half a revolution
of the main shaft will turn the loose pulley less than one hundred and eighty
degrees.
It follows that if the main shaft is turned half a revolution in either direction
from the dead point (which is the normal position) the loose pulley will always
turn in a fixed direction. One end of a cord or strand is anchored to the loose
pulley, the other end of which after passing round a weight pulley is anchored
to another V pulley (which we call the switch pulley) concentric with and equal
in size to the loose pulley but fixed to a spindle carrying an arm which travels
over a number of contact blocks bridged with wire resistance coils or the like.
Two lugs on these pulleys engage with each other so that while the loose pulley
can turn forward without turning the switch pulley, the switch pulley cannot
turn until the loose pulley has turned and then only through an equal angle.
A pin fixed in the switch pulley works in a radial slot cut in a ratchet wheel
concentric with the ✓ pulleys, the length of the radial slot being so designed

page_text: as that the switch pulley can turn carrying with it the contact arm through an
angle equal to the break on the resistance switch, without turning the ratchet
wheel; in order to turn further, the switch pulley must carry round with it the
ratchet wheel. A pawl engaging with the teeth of the ratchet wheel is carried
on a spur wheel which can only turn by driving an escapement or 'equivalent
checking device.
The action of the switch is as follows:-
When the pulley or its equivalent on the main shaft is turned half a revolution
At the same time.
in a clockwise direction, the reversing switch will be turned.
the eccentric rod will move forward, turn the loose pulley, wind up the cord and
raise the weight. The other end of the cord being attached to the switch pulley
will turn it until checked by the ratchet wheel and will then continue turning
at a slow speed, driving the escapement or other regulating mechanism. The
arm of the resistance switch is thus brought quickly on to the first block and
then travels slowly over the remaining blocks. When the main spindle is turned
back to the normal position the reversing switch will also be turned back to the
normal position and the eccentric rod will turn back the loose pulley which carries
back with it by means of the before mentioned lugs the switch pulley, this, owing
to the ratchet action, is able to turn in this direction without operating the
checking device. As both pulleys now turn together the weight will remain
stationary. When the main shaft is turned in a counter clockwise direction it
will be seen that while the reversing switch will move in the opposite direction
to that in which it moved before, the pulleys and resistance switch arm will
travel exactly as before. When the main shaft is turned back to normal position
both switches return to normal position as before.
We will now describe our invention more particularly by means of the draw-
ings annexed, in which-
Fig. 1. Is a side elevation, the front plate being removed.
Fig. 2. Is a section on line a b Fig. 1.
Fig. 3. Is a plan.
In the drawing A is the main shaft which operates either directly or by spur
or like gearing a revolving reversing switch B. The connecting rod C coupled
at one end by a strap to the eccentric D), secured to the main shaft A is connected
at the reverse end to a stud E fixed in the side of a V pulley F, which runs loose
upon a stud or separate shaft G. The throw of the eccentric 1) and the radius
of the stud E from the centre of the shaft G carrying it, being so adjusted as that
half a revolution of the main shaft A will turn the loose pulley Fless than one
hundred and eighty degrees. It follows that if the main shaft A is turned half
a revolution in either direction from the dead point as shewn in the drawing
(which is the normal position) the loose pulley F will always turn in a fixed
direction. One end of a cord H or strand is anchored to the loose pulley F, the
other end of which after passing round a weight pulley J carrying a weight K
is anchored to another V pulley L (which we call the switch pulley) concentric
with and equal in size to the loose pulley F but fixed to a spindle G carrying an
arm M which travels over a number of contact blocks Z bridged with wire resist-
each of these pulleys F and L,
ance coils or the like. Two lugs N N¹ one on
engage with each other, so that while the loose pulley F can turn forward with-
out turning the, switch pulley L, the switch pulley cannot turn until the loose
pulley F has turned and then only through an equal angle. A pin fixed in
the switch pulley works in a radial slot P cut in a ratchet wheel Q concentric
with the V pulleys F and L, the length of the radial slot being so designed as
that the switch pulley L can turn carrying with it the contact arm M through
an angle equal to the break on the resistance switch without turning the ratchet
wheel Q; in order to turn further the switch pulley L must carry round with it
5 the ratchet wheel Q. A pawl R engaging with the teeth of the ratchet wheel Q
is carried on a spur wheel S which can only turn by driving a checking device.
In the drawing is shewn a train of wheels operating an eccentric which works a

page_text: pendulum V. The whole of this checking device may however if more convenient
be replaced by a dash pot.
In the drawing we have shewn a pinion T fixed to a shaft on which is keyed a
wheel T which in turn gears with a pinion T" mounted on a shaft t¹, on the
other end of this shaft is fixed an eccentric U which operates the rod U₁, the
opposite end of which is connected by the pin U to the pendulum V pivoted
at W to the side frames X. The pendulum V of the checking device is driven
rapidly to and fro by the action of the wheel train and eccentric and thus serves
to control the speed at which the spur wheel S can turn. This checking device
may however be replaced by any equivalent mechanism having the same effect.
The action of the switch is as follows:-When the main shaft A is turned
half way round clockwise, the reversing switch B will be turned in a counter
clockwise direction, at the same time, the eccentric rod C will move forward and
turn the loose pulley, thereby winding up the cord H, and raise the weight K,
the other end of the cord being attached to the switch pulley L, will turn it until
checked by the ratchet wheel Q. and will then continue turning at a slow speed
driving the checking device. The arm M of resistance switch is thus brought
quickly to the first block Z of blocks Z, and then travels slowly over the remain-
ing blocks. When the main spindle A is turned back to the normal position
the reversing switch B will also be turned back to its normal position and eccen-
tric rod C will turn back the loose pulley F which carries back with it by means
of lugs N N the pulley L and arm M. This, owing to the ratchet wheel Qis
able to turn in this direction without operating the checking device. As both
pulleys F and L now turn together the weight will remain stationary. When
the main shaft A is turned in a counter clockwise direction it will be seen that
while the reversing switch B will move in a clockwise direction, the pulleys FL
and the resistance switch arm M will travel exactly as before.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
1. In apparatus for controlling electrically operated lifts and for other power
purposes, the combination and use of the particular apparatus herein described
constructed and operating in the way and manner set forth.
2. In apparatus for controlling electrically operated lifts and the like, the
combination of a fast and loose pulley mounted upon the same shaft, which also
carries the switch arm M, the blocks N'N thereon; the cords H supporting
weight K passing around and anchored to said pulleys so that when turned in the
same direction it will wind off one and on to the other, the pin O in fast pulley
engaging with slot P in ratchet wheel Q and the pawl R on spur-wheel T opera-
ting a checking device. The respective parts interacting for the purpose specified.
Dated this 29th day of December 1898.
FRANCIS M. ROGERS,
Agent for the Applicants,
21, Finsbury Pavement, London, E.C.