Improvements in Apparatus for Raising and Lowering Bodies, applicable for instance to Electric and other Lamps, and Railway Carriage and other Blinds, and to Hoisting Gear.
Year: 1893

page_text: Date of Application, 28th July, 1893
Complete Specification Left, 30th Apr., 1894-Accepted, 2nd June, 1894
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Raising and Lowering Bodies,
applicable for instance to Electric and other Lamps, and Railway
Carriage and other Blinds, and to Hoisting Gear.
We, REUBEN THOMAS PRESTON of Deptford, Engineer, and ARTHUR
BERNARD GILL of Shirley House, Grove Park, Lee, both in the County of Kent,
Electrical Engineer do hereby declare the nature of this invention to be as
follows:-
Our invention has for its object an improved means of raising and lowering
bodies whereby the movable body can be retained in any desired position without
the use of balance weights. When applied to the raising and lowering of electric
lights I provide a plate or bracket with bearings in which can revolve a grooved or
other pulley of suitable shape to which is attached a spiral or volute spring having
its other end attached to the plate or bracket. The flexible cord or wire from
which is suspended the lamp, shade or other fitting is connected to the journals of
the pulley, and the bearings will then convey the current to the lamp. When the
spring. is wound up the tendency will be to wind up the flexible cord or wire or
should the weight of lamp shade, or fitting be too great there will be a tendency to
fall. This is prevented by providing a brake of suitable shape acting on the
circumference of the pulley or other moving part, this brake is actuated by the
flexible cord or wire passing over a small pulley attached to the brake. The small
pulley may itself form the brake being carried by suitable lever gear. The weight
of the lamp shade or fitting tends to move the flexible cord or wire into a vertical
line from the unwinding side of the circumference of the cord or wire wound on
the pulley and thus applies the brake which will hold the pulley from revolving.
When the weight is raised the brake goes off and the coil spring winds the wire
up. Our invention may be applied to railway carriage or other blinds and to
various kinds of hoisting gear.
Dated this 28th day of July 1893.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Raising and Lowering Bodies,
applicable for instance to Electric and other Lamps, and Railway
Carriage and other Blinds, and to Hoisting Gear.
We, REUBEN THOMAS PRESTON of Deptford, Engineer, and ARTHUR
BERNARD GILL of Shirley House, Grove Park, Lee, Electrical Engineer, both
in the County of Kent, 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:-
Our invention has for its object an improved means of raising and lowering
bodies, whereby the movable body can be retained in any desired position without
the use of balance, weights. When applied to the raising and lowering of electric

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lights we provide a plate or bracket with bearings in which can revolve a grooved
or other pulley of suitable shape, to which is attached a spiral or volute spring
having its other end attached to the plate or bracket. The flexible cord or wire
from which is suspended the lamp shade or other fitting is connected to the journals
of the pulley and the bearings will then convey the current to the lamp. When
the spring is wound up the tendency will be to wind the flexible cord or wire, or
should the weight of lamp, shade or fitting be too great there will be a tendency to
fall. This is prevented by providing a brake of suitable shape, acting on the
circumference of the pulley or other moving part, this brake is actuated by the
flexible cord or wire passing over a small pulley attached to the brake. The small
pulley may itself form the brake being carried by suitable lever gear. The weight
of the lamp, shade or fitting tends to move the flexible cord or wire into a vertical
line from the unwinding side of the circumference of the cord or wire wound on the
pulley and thus applies the brake which will hold the pulley from revolving.
When the weight is raised the brake goes off and the coil spring winds the cord or
wire up.
In the accompanying drawings we have shewn the invention applied to the
raising and lowering of an electric incandescent lamp of ordinary forin suspended
by the cord containing the leads or wires therefor.
Figure 1 is a plan of underside of base plate or ceiling rose, Figure 2 side view
of same with the cap in section and shewing the lamp suspended therefrom;
Figure 3 one end view with the cap removed and Figure 4 another end view.
On the foundation plate A are mounted brackets B and B forming bearings for
the pulley C to revolve freely therein. In the part or casing C₁ of this pulley is
contained a spiral or fusee spring D, Figure 3, having one end formed with a slot
hole for attaching it to a peg B on the bracket B while the other end of the
spring is attached to the inside of the casing C. This spring when wound up has
the tendency to wind up the cord E. On the pulley C is fixed one end of the
cord E containing the electric leads for the lamp F suspended thereby. The
wires N and S are connected to the brackets B and B the wire N being connected
through the fuse O; the connection with the wires in the cord E is by lateral
holes to the centre of the hollow bosses G, the wire ends being pinched between
the milled edge nuts H. On the plate I are fixed two flexible wire arms K which
carry between them a small brake pulley L over which the pendant end of the
cord E is passed as shown in Figures 3 and 4; or the arms K instead of being
flexible wire may be rigid bars jointed to pivots on the plate I. If the weight of
the lamp F and shade be too great there will be a tendency for them to drop but
this is prevented by the brake formed in this case by the wires K acting against
the pulley C which is formed with grooves to receive them and guide them
laterally. The weight of the lamp and shade tends to move the flexible cord E
into a vertical line from the unwinding side of the coil circumference on the pulley
and thus applies the brake and holds the pulley from revolving. When the cord E
is taken hold of so as to raise the lamp, the brake goes off, taking the position
shewn in dotted lines in Figure 4, and the spring D then winds the cord up upon
the pulley.
1
Our invention may be applied to railway carriage or other blinds and to various
kinds of hoisting gear.
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
1. In combination with a pulley having coiled thereon and suspended therefrom
a cord with weight attached thereto, the application of a coil spring for coiling up
the cord against the force of the weight and a brake consisting of an arm or arms
acting upon the circumference of the pulley or part connected therewith and
i, carrying at the end a small pulley which normally holds the brake on by reason of
the weighted cord passing over it substantially as and for the purposes set forth.

page_text: 2. The construction of ceiling rose, pulley and brake for a suspended electric:
lamp whereby the use of a counter weight is obviated while the lamp can be raised
and lowered into any desired position substantially as described and shewn.
Dated this 30th day of April 1894.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.