Year: 1885

page_text: I THOMAS BRIGHT WILSON of Stansfield, Heaton Moor, Stockport, in the County
of Lancaster, Civil Engineer do hereby declare the nature of this Invention to be
as follows:-
My Invention relates more particularly to the lamps which are employed to give
light downward as for example to the lamps used or which may be uscú by
draughtsmen, engravers, watch-makers and designers, but my invention may be
adapted to many other uses in cases wherein it is desirable to be able to raise and
lower the light.
To facilitate the raising and lowering of an electric lamp I suspend it by means
of a combination of parts jointed together on the lazy tongs principle and I employ
in addition & suitable conductor to convey the electric fluid or I make provision at
the outer joints or at some of them for the maintainence of suitable metallic
contact. When using a conductor it is conveyed in a zig-zag or spiral course so
that the movement of the parts is not interfered with. In one arrangement
I provide certain of the said joints with hooks, curls or eyes through which the
conductor is passed. To retain the lamp at the required height I employ a cord
and clamp or winch or I counterbalance the weight of the parts or I depend upon
the friction at the joints or apply tightening screws to one, two or more of the
joints. To enable me to move the lamp sideways I in some cases apply a shifting
weight to a projecting arm which may be moveable around the vertical axis so that
by moving the weight as required the lamp may be moved sideways by the
inclination of the suspending medium.

page_text: * Improvements in Means for Suspending Electric Lamps.
I THOMAS BRIGHT WILSON of Stansfield, Heaton Moor, Stockport, in the County
of Lancaster, Civil Engineer, do hereby declare the nature of the said Invention
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement and accompanying drawings:—
My Invention relates more particularly to the lamps which are employed to give
light downward as for example to the lamps used or which may be used by
draughtsmen, engravers, watch-makers and designers, but my invention may be
adapted to many other uses in cases wherein it is desirable to be able to raise and
lower the light.
To facilitate the raising and lowering of an electric lamp I suspend it by means
"of a combination of parts jointed together on the lazy tongs principle and I employ
in. addition a suitable conductor to convey the electric fluid or I make provision at
the outer joints or at some of them for the maintainence of suitable metallic
contact.
In one arrangement 1 provide certain of the said joints with hooks, curls, or eyes
through which the conductor is passed. To retain the lamp at the required height
I employ a cord and clamp or winch or I counterbalance the weight of the parts
or I depend upon the friction at the joints, or apply tightening screws to one, two
or more of the joints. To enable me to move the lamp sideways I in some cases
apply a shifting weight to a projecting arm. In order that the nature of my
invention and the manner in which I carry the same into practical effect may be
.fully understood I will describe the said invention. with reference to the accom-
panying sheet of drawings wherein Figs. 1 and 2 drawn to a scale of about four
inches to the foot represent my improved lamp suspender the two figs, showing
what may be termed front and side views of the apparatus.
In the said figs. a is an electric lamp provided with a reflector B and carried
by the extensile and retractile lamp suspender c. which is composed of bars or
members c. jointed together on the "lazy-tongs" principle as clearly shown in
Fig. 1. The electric current is conveyed to the lamp by means of a conductor d
which takes a zig zag course on its way from end to end of the suspender the bends
of the conductor co-inciding with the outer joints at e e in order that the extension
and retraction of the carrier may not be interfered with. In the example the pins
of the outer joints at e are formed with hooks or curls as indicated at fin figs. 3
and 4 which are two views of one of the joints e drawn about the full size. The
indicated form of hook facilitates the application of the conductor but if preferred
a simple eye such for example as is represented in Fig. 5 or a projecting stud or
button may be used. Any other suitable means may be used for securing the con-
ductor or for conducting the electric current as for example a conductor in the form
of a spiral may be used or the electric current may be conveyed by the carrier c
itself as bereinbefore mentioned. The joint pin of the lower end joint g is formed
as a screw bolt which is provided with a nut n whereby the joint may be tightened.
When the lamp is to be raised or lowered this nut is loosened and when the lamp
has been adjusted in position it is retained in the new position by tightening the
-

page_text: nut so as to prevent the lowering of the lamp by the extension of the suspender.
If preferred greater rigidity or security may be obtained by applying a slotted link
to connect the two joints g and i as indicated by the dotted lines in fig. 1. In the
example an arm k projects from the upper end of the suspender and is provided
with a shifting weight l. When this weight is moved toward the outer end of the
arm the suspender is deflected from the perpendicular and the lamp is thereby
moved horizontally. In the example a cord indicated by dotted lines is attached
by one end to the weight the other end of the cord being wound upon a small
barrel m. By turning this barrel the weight can be drawn toward the suspender or
be permitted to slide toward the outer end of the arm as desired. Fig. 6 illustrates
a modification wherein the weight is mounted to slide upon an extension of one of
the upper members of the suspender c. I do not confine myself to the employment
of such shifting weight as the apparatus may be used without such an appliance.
Horizontal movement of the lamp might be obtained by suspending the entire
apparatus without the parts k, l from an overhead radius arm.
Having now particularly described and ascertained the nature of my said.
invention and in what manner the same is to be performed I declare that what
I claim is :-
1. The combination of parts forming the apparatus or appliance substantially
as and for the purpose set forth and indicated herein before and in and by the
accompanying drawings.
2. An extensile and retractile suspender for electric lamps composed of members
jointed together upon the lazy tongs principle substantially as set forth and
indicated.
3. As means for the adjustable suspension of an electric lamp the bars or
members c jointed together in the indicated manner in combination with an
electric conducter d bent into a zig-zag form by being passed through or over
hooks, eyes or buttons at the outer joints e.