Improvements in Apparatus for Raising and Lowering Arc Lamps.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Raising and Lowering Arc Lamps.
We, WILLIAM JAMES DAVY, and GEORGE THOMAS-DAVIES, both of Horsell Road
Works, Highbury, in the County of London, Engineers, do hereby declare the
nature of this invention to be as follows:-
This invention for improvements in apparatus for raising and lowering arc
lamps relates to hoisting apparatus enclosed in the post from which the lamp is
suspended and has for its object to control the hoisting and lowering mechanism
through a single small hole in the casing of the post without having to open a door.
According to this invention the socket of the winch handle fitting on the square
end of the shaft of the hoisting drum is fitted with a sleeve also provided with a
handle and with a cam adapted to operate the pawl of the hoisting mechanism to
throw it out of gear. The hole in the lamp post is made sufficiently large to allow
of the passage of the sleeve. To lower the lamp, the sleeve is operated to throw
the pawl of the hoisting mechanism out of gear and then the winch handle is
operated to lower the lamp.
In one arrangement of mechanism the winch handle has a socket fitting over the
square end of the shaft of the hoisting drum. A sleeve is fitted concentrally on
the socket and is provided at its outer end--the end remote from the socket and
near to the handle-with a handle by which it can be operated. At its inner end
the socket is provided with a notch or recess into which takes the end of an arm
forming part of the pawl.
When desired to lower the lamp, the socket is inserted on the end of the drum
spindle, the sleeve is rotated and pushed gently endwise until the pawl arm engages
in the recess. By further rotating the handle the pawl arm is operated to throw
the pawl out of gear when the lamp can be lowered in the usual way. The lamp
can of course always be raised without releasing the pawl.
Doted this 14th day of April 1897
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Raising and Lowering Arc Lamps.
We, WILLIAM JAMES DAVY, and GEORGE THOMAS-DAVIES, both of Horsell Road
Works, Highbury, in the County of London, Engineers, 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:—
This invention for improvements in apparatus for raising and lowering arc
lamps relates to hoisting apparatus enclosed in the post from which the lamp is
suspended and has for its object to control the hoisting and lowering mechanism
through a single small hole in the casing of the post without having to open a
door.

page_text: According to this invention the socket of the winch handle fitting on the square
end of the shaft of the hoisting drum is fitted with a sleeve also provided with a
handle and with a cam adapted to operate the pawl of the hoisting mechanism to
throw it out of gear. The hole in the lamp post is made sufficiently large to allow
of the passage of the sleeve. To lower the lamp, the sleeve is operated to throw the
pawl of the hoisting mechanism out of gear and then the winch handle is operated
to lower the lamp.
In one arrangement of mechanism the winch handle has a socket fitting over
the square end of the shaft of the hoisting drum. A sleeve is fitted concentrically
on the socket and is provided at its outer end--the end remote from the socket and
near to the handle with a handle by which it can be operated. At its inner end
the socket is provided with a notch or recess into which takes the end of an arm
forming part of the pawl. When desired to lower the lamp, the socket is inserted
on the end of the drum spindle, the sleeve is rotated and pushed gently endwise
until the pawi arm engages in the recess. By further rotating the handle the pawl
arm is operated to throw the pawl out of gear when the lamp can be lowered in
the usual way. The lamp can of course always be raised without releasing the
pawl.
In the accompanying sheets of illustrative drawings: Fig. 1 is a section of a
lamp post fitted with apparatus for raising and lowering arc lamps constructed
according to this invention. Fig. 2 is a section to an enlarged scale of the upper
part of the lamp post. Figs. 3 and 4 are detail views showing the guide rollers
over which the hauling rope passes. Figs. 5 and 6 are elevations at right angles
to one another of the winch and Fig. 7 is an elevation of the winch handle.
The drum a of the winch is fixed on a spindle b mounted in bearings in a
bracket c fixed within the enlarged chamber at the foot of the lamp post c. T'he
end of the spindle 6 is squared and a hole f is provided in the lamp post opposite
its end. Rigidly attached to the drum a is a ratchet wheel g into which gears the
weighted pawl h pivoted in the bracket e and provided with an arm i. The arm i
terminates in close proximity to the spindle b. The winch handle is fitted with
a sleeve m provided with a handle and with a projection or recess s adapted to
operate on the pawl arm i. The winch cord n passes from the winch drum a
up the post e and through the curved bracket arm o through which it is guided by
the rollers p.
The lamp is raised by simply turning the winch handle in the proper direction.
When desired to lower the lamp, the handle with its sleeve m is placed on the
spindle and the sleeve m is rotated whilst being pressed lightly inwards until its
notch s engages with and then operates the pawl arm i to force the pawl out of
gear with the ratchet wheel g when the lamp can be lowered by rotating the handle/
in the opposite direction.
It will readily be seen that this hoisting gear cannot be tampered with as it
is always left in the raised position and can then only be operated by any person
having the proper handle with its sleeve.
The arrangements securing the cord to the lamp, leading the conductors to the
lamp, for making and breaking the circuit to the lamp are fully described in our
prior Specification No. 8906 of 1897.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:-
The improvements in apparatus for raising and lowering arc lamps substantially
as described.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.