An Improved Articulated Joint for the Suspension of Gas-lighting Apparatus.
Year: 1890

page_text: COMPLETE SPECIFICATION.
An Improved Articulated Joint for the Suspension of Gas-lighting
Apparatus.
I, ALPHONSE GRENIER of 15 Faubourg Montmartre Paris in the Republic of France,
Gas-Lighting Engineer 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 has for its object an improved articulated joint for the suspension
of gas-lighting apparatus in all cases where it is desired that there should be a certain
amount of mobility.
Up to the present, ball joints which are difficult to make and keep. gastight and
which do not give that certainty of support necessary, and swivels formed of two
vertical pieces and one horizontal piece forming the axis of rotation, have been made
use of.
In the cases where swivels are made use of, the weight of the apparatus being
on one side of the point of suspension, tends to throw the apparatus out of plumb,
whilst at the same time there is a want of rigidity and resistance when the apparatus
is moved to bring it to any desired position.
Now, in order that my invention which remedies these various defects, may be
fully understood and readily carried into effect I will proceed to describe the
accompanying sheet of drawings as examples only, reference being had to the
figures and letters thereon marked.
Fig. 1. is a longitudinal section through the axis of a joint made according to my
invention.
Fig. 2. is a cross section through the same perpendicular to the plan of Fig. 1.
Fig. 3. is a side elevation, and
Fig. 4. an end elevation of the joint.
In the different figures the same letters refer to the same parts.
The joint is composed of a piece of brasswork or other suitable metal, a, which
screws or is otherwise secured to the ceiling or to the gas supply pipe and is furnished
with two branches b b¹.
Between the branches is placed a second piece c to which the gas-lighting
apparatus is suspended and as will readily be seen, will assume a truly vertical
position.
The pieces a and c are secured together by a plug d passing through the branches
and 6 and upper part of the piece c and is maintained in position by a screw f and
washer g.
In order to prevent leakage, the plug d must be carefully ground into the parts d¹
of the branch 61; this being an important detail for the proper working of the
joint.
In order to allow the gas to pass through the joint, the plug d has a circular
groove h, which is put into communication with the passage in a by a hole i.
In the groove h the plug d. is pierced with holes k. into a central passage j, and
thence the gas passes into the vertical passage through the channel l.
Z¹
By this arrangement the gas is supplied to the suspension in an equable manner
whatever be the angle which the piece c makes with the piece a.
And lastly, a small screw or pin m serves to secure the plug d to the piece c, so
that however tight the ground joint may be the plug d and the piece c are so held
together as to be practically one piece and no escape of gas can possibly take place.
It is very
obvious that my invention besides having the advantages indicated above
has a much more graceful appearance than the swivel joint. In fact the joint is
perfectly symmetrical and can be polished or decorated in any desired manner according
to the style of the apparatus to which it is required to be applied.

page_text: It will of course be seen that the forms and dimensions of the joint may vary as
well as the arrangement without changing the nature of the invention.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
; one
An improved articulated joint for the suspension of gas-lighting apparatus con-
structed principally of two pieces, the one placed in prolongation of the other
of which is forked and secured to the other by means of a plug in the manner
substantially as shown on the accompanying sheet of drawings and herein described.
Dated this 3rd day of January 1890.
A. GRENIER,
Applicant.