Year: 1893

page_text: Date of Application, 27th Oct., 1893-Accepted, 20th Jan., 1894
A communication from ALEXANDER GEORGE GREIM, of Reval, in the Empire
of Russia, Merchant.
I, Alfred JuliUS BOULT of 323 High Holborn in the County of Middlesex,
Chartered Patent Agent, 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 the ordinary standard lamps hitherto in use in which the height of the
burner is adjustable, or what are generally known as sliding lamps, the support
for reservoir and burner consists of a smooth rod adjustable in a collar, or itself
fixed or unadjustable, but provided with an adjustable collar supporting the lamp. In
both cases the adjustable collar was secured against the fixed part by a set screw.
There are however several grave disadvantages connected with this arrangement,
the more to be considered as they may give rise to accidents of a serious nature.
Thus the connection between the parts may become insecure through the rod being
rendered greasy by the petroleum or through being pulled-or a loosening of the
parts may result unintentionally through accidentally touching the handle of the
screw, or may result automatically from shocks-frequently too the regulator may
be over-screwed.
It is the aim of the inventor to obviate all these disadvantages, and he effects
this by adopting an arrangement for his sliding lamp by which its position may be
fixed automatically at any desirable height.
Figure 1 is an elevation partly in section of the lower part of a table lamp.
Figures 2 and 3 are transverse sections on the lines x- and y-y and show the
parts operating in the adjustment of the height of the lamp.
The rod a supporting the lamp is formed into a coarse-pitched male screw which
is longitudinally adjustable in the tube c secured in the foot b, but is rendered
incapable of rotation therein by a pin d fixed upon a and engaging in a longitudinal
slot in the tube c. The upper part of the tube c confines the socket e this is
formed internally into a female screw which engages with the screw a serving in
fact as a nut for the latter. To allow of the nut e being conveniently handled and
also to suitably close off the foot b above, the annular cap g is slipped over the
former; it is capable of rotating and is secured in a suitable manner against being
lifted off. On turning g the rotation imparted to it is transferred to e by a groove
and spring h.
In order to adjust the lamp to any required height it is only necessary to
turn ge in one direction or the other the rod a being thus either screwed into or
out of b. It is essential that the rod by the friction in the threads of the screws
shall remain fixed in any position which it may have attained, uninfluenced by
shocks or similar disturbances. Nor is there any fear of the lamp by reason of
its weight suddenly falling down and breaking which in the old arrangement might
frequently result from any careless loosening of the screw.
The second form of this lamp shown in Figure 4 (a sliding lamp proper-a
work reading or standard lamp) possesses the same advantages. Here the rod a is
also formed into a screw but is not longitudinally adjustable. It is however
capable of rotation in the foot i and cross piece of the rod 1, by means of the
handles m. The nut which carries the lamp by means of an army engages with
the rod a and is prevented from rotation by a guide piece o movable along 7.
ID 077

page_text: In place of this arrangement, the spindle a might like the rod / be firmly fixed
and incapable of rotation-in which case as indicated in Fig. 5, the nut n would
be adapted to rotate in the arm p and the lamp adjusted by turning it.
Other modifications of construction are admissible without departing from the
spirit of the invention.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is :-
1. A "sliding" lamp capable of being vertically adjusted without the employ-
.ment of set screws or the like the rod a being for this purpose formed into a screw
which is either guided so as to be itself incapable of rotating and adjusted
vertically by a confined nute which is capable of rotation or is capable of
rotary displacement relatively to a nut n guided by the help of a second rod /.
2. The combination and arrangement of parts constituting the complete lamp
substantially as described and illustrated in Figure 1 of the accompanying
drawings.
3. The combination and arrangement of parts constituting the complete lamp
substantially as described and illustrated in Figure 4 of the accompanying
drawings.
Dated this 27th day of October 1893
W. P. THOMPSON & BOULT.
London, Nottingham, Liverpool, and Manchester,
Agents for the Applicant..