Improvements in Telephone Switch Boards.
Year: 1893

page_text: Date of Application, 4th Oct., 1893
Complete Specification Left, 2nd July, 1894-Accepted, 4th Aug., 1894
PROVISIONAL SPECIFICATION.
[Communicated from abroad by SOCIÉTÉ GÉNÉRALE DES TELÉPHONES (Reseaux
Teléphoniques et Constructions Electriques), of 41, Rue Caumartin, Paris,
France, Manufacturers.]
Improvements in Telephone Switch Boards.
I, CHARLES DENTON ABEL, of No. 28, Southampton Buildings, Chancery Lane,
in the County of London, Chartered Patent Agent, do hereby declare the nature of
this invention to be as follows: :-
This invention relates to a construction of telephone switch board having the
rows of spring jacks and the bands by which they are connected to their respective
wires so arranged that any row can be drawn out forwards from the fixed-framing
for inspection or repair and similarly any band can be drawn out backwards. For
this purpose, there are fixed to the uprights of the fixed framing supports made of
insulating material each support having at each side a number of horizontal
grooves above each other: Each horizontal row of spring jacks is provided at
each end with a projecting fillet so that when the row is pushed towards the frame
each of these fillets enters and slides along the groove of the support, in the same
manner as a drawer. In like manner the connecting bands at the back of the
frame are slid into position. When it is necessary to examine or repair any row,
it can be slid out for that purpose. In order that each spring jack may be
separable from the connections to its wires, it is made with its two springs
projecting at its rear end separated by a piece of non conducting material, and
from the connecting band behind there projects forward two springs each
connected to one of the wires. When a row of spring jacks or a band is pushed
into its place as above described, the springs projecting from the jack are pressed
in between the springs projecting from the band, rubbing along them to make good
contact.
Dated this 4th day of October 1893.
ABEL & IMKAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Telephone Switch Boards.
I, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, Chancery
Lane, in the County of London, 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 :-
This invention relates to a construction of telephone switch board having the
rows of spring jacks and the bands by which they are connected to their respective
wires so arranged that any row can be drawn out forwards from the fixed framing
for inspection or repair, and similarly any band can be drawn out backwards.
For this purpose the switch board and spring jacks are arranged as shewn in the
accompanying drawings.
Figs. 1, 2 and 3 are respectively an elevation, a plan and a
on M N of Fig. 1.
cross section
Fig. 4 is a vertical cross section on P Q drawn full size. A is the row of spring
[Frice 8d.]

page_text: jacks, B is the connecting band; the springs C of the former are pushed in with
friction between the springs D of the latter; a piece E of non conducting material
is slid between the springs C to keep them insulated.
The socket o of the spring jack has an oblong opening as shewn by the front
view Fig. 5; the part of the plug which enters it has the same oblong shape as
shewn in the end view Fig. 6. This arrangement facilitates the insertion of the
plug into the spring jack.
Fig. 7 is a perspective shewing how according to this system the spring jacks
are fixed and combined, also the connecting bands and springs.
Figs. 8 and 9 shewn in elevation and cross section the metal framing to receive
the rows of spring jacks and their connecting bands.
All the uprights F of the frame are of ion of I section.
The angle irons J K connect the uprights F and form the supports for the
spring jacks. The first piece placed immediately on the angle iron J (Figs. 1, 2, 3
and 7) has the same form as a row of spring jacks; but it has no electric organ,
its only object is to insulate electrically the framing relatively to the spring
jacks.
Likewise the first piece placed on the angle iron K has the same shape as a
connecting band, but it serves only to fill the space. The small uprights a b c d
connected by a cross tie ef constitute two frames in which the spring jack cables
are supported.
These rows of moveable spring jacks are made of ivorine.
The spring jacks rest on the angle iron J on ivorine supports G which are rack
toothed on their sides, and the spring jacks have corresponding projections a¹
which engage between the teeth 6 of the racks G, like a drawer sliding in
grooves; this arrangement facilitates the withdrawal of any of the jacks for
examination or repair. For this purpose the spring jacks are furnished with metal
studs c' on which can be screwed a tool or handle to pull by.
The front part of the toothed pieces G is covered by a band H which embraces
a certain number of spring jacks, 10 for instance. These bands are of metal fixed
by bolts. The connecting bands B are also mounted in rack toothed pieces G¹,
which are carried on the angle iron K. The pieces G and G¹ of ivorine are
attached to copper plates which are screwed to the uprights F.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what 1 claim
in respect of a telephone switch board is :-
1. The arrangement of the rows of moveable spring jacks each provided with
springs which are separated by a piece of non conducting material, and which are
enclosed with friction between the springs of a connecting band, substantially as
described.
2. The arrangement of the superposed rows of spring jacks and connecting
band between rack toothed ivorine supports allowing of their sliding horizontally,
substantially as described.
Dated thin and day of Tul 1904
ABEL & IMRAY,
Agents for the Applicant.