Improvements in Terminals for Electrical Connections, especially adapted to Incandescence Lamp Holders.
Year: 1898

page_text: Date of Application, 31st Jan., 1898
Complete Specification Left, 21st Oct., 1898-Accepted, 26th Nov., 1898
Improvements in Terminals for Electrical Connections, especially
adapted to Incandescence Lamp Holders.
We, GUSTAV BYNG, Electrical Engineer, and HENRY BEVIS, Electrical Engineer,
both of 69-71-88, Queen Victoria Street, in the City and County of London, do
hereby declare the nature of this invention to be as follows:-
Our invention relates to certain improvements in terminals, more especially
adapted to incandescence lamp holders, and has for its object a method of and
means for obtaining a grip upon a conductor, when directly inserted into a lamp
holder or other electrical fitting which secures a perfect contact other than that
afforded by the compression of a screw within a bore, as heretofore used.
In carrying our invention into effect we employ a screwed plug of larger
diameter than would be necessary in the case of a compression terminal, and
cause this to traverse one or more screwed guides fixed to the insulating base of
the lamp holder or other fitting. A hole is bored in said screwed plug at right
angles to its axis in such a position as to coincide with the hole in the insulating
base through which the barèd end of the conducting wire passes. Therefore,
when the screw is turned, the wire is wound upon it, forming a contact, and at
the same time locking said screw against accidental displacement.
We may modify this arrangement by fixing the screw to a pillar upon the
insulating base, and using a screwed sleeve nut, with a recess, so that when the
barèd wire is passed through the hole in the fixed screw, and the sleeve is screwed
upon it, the enclosed wire is drawn within the recess, and a perfect contact is
made, and the sleeve is locked by impinging upon the pillar to which the fixed
screw is attached.
Or, instead of said screwed sleeve, we may use a free washer, or collar which
impinges upon the wire when coiled, and turns with it, or slips when the tension
is excessive.
We
We may further modify the terminal according to our invention by employing
a screw with an eccentric or cam head, said screw being parallel to the wire when
inserted in the hole in the insulated base of the fitting. At a certain position
of said screw,
the hole in the cam head is coincident to the hole in the base, so
that a rotary movement of the screw twists the wire under the head, and makes
good contact and at the same time locks the screw by tension.
Or, as an alternative method upon the same basis, we use a vertical plate or
pillar, against which the bared wire may lay when pushed through the hole in
the base which is clear when the cam headed screw is in its normal position. A
light turn of said screw presses the wire between the cam head and the plate or
billar aforesaid.
Dated thin orth 1
T
1000
FREDK. WALKER,
73, St. Stephen's Road, Upton Park, E. London,
Agent for the Applicants.

page_text: Improvements in Terminals for Electrical Connections, especially
adapted to Incandescence Lamp Holders.
We, GUSTAV BYNG, Electrical Engineer, and HENRY BEVIS, Electrical Engineer,
both of Nos. 69-71-88, Queen Victoria Street, in the City and County of London,
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 relates to certain improvements in terminals more especially
adapted to incandescence lamp holders and has for its object a method of, and
means for obtaining a grip upon a conductor when directly inserted into the hole
formed in the base of a lamp holder or like fitting, which secures a perfect con-
tact, other than the partial contact afforded by the compression due to a screw
placed at right angles to a borèd terminal, and holding the end of the conductor
within said bore.
In order that our invention may be clearly rendered, in the description thereof,
we have appended the accompanying sheet of drawings, in which Figure 1 is a
part sectional view of an ordinary lamp holder showing the position of an insu-
lating base carrying the improved terminals according to our invention. Figure 2
is an upper plan view of the insulating base. Figure 3 is an elevation partly in
section, of one lamp terminal and Figure 4 is a plan view thereof. Figure 5 is
an elevation, partly in section of a terminal pillar with a borèd screw; Figure 6
is an elevation partly in section of a lamp terminal in which the connecting device
is a modification of the foregoing. Figure 7 is a plan view thereof. Figure 8 is
an elevation partly in section of a lamp terminal with a cam connection a further
modification upon the same lines. Figure 9 is a plan view thereof. Similar
letters of reference indicate corresponding parts throughout the several views and
for better illustration these have been drawn to an enlarged scale.
In carrying our invention into effect we fix or form integrally upon the contact
base B Figures 1, 2, 3 and 4 a screw stud C with a hole a coinciding with a
similar hole in the insulating base A. A sleeve nut D engages with the thread
upon the stud C and when screwed home grips the barèd end of the conductor
between its inner face and that of the contact base B. The latter is fixed to the
insulating base A by a screw b and the whole connection is sunk below the sur-
face as shown by Figures 1 and 2, the ordinary spring plunger or other connec-
tion or contact e projecting therefrom. The sleeve D may be slightly recessed
or chamfered upon its inner face so as to draw the free end of the conductor pass-
ing through the hole a partly round the stud thus increasing the area of the
contact. We may modify this arrangement by using a screw D Figure 5, having
a hole a bored through it at right angles to its axis. In the act of tightening the
contact by screwing the screw D home, the barèd end of the conductor is wound
round it, and by compression forms a perfect electrical contact. We may modify
this device as shown by the part sectional elevation Figure 6 and the correspond-
ing plan view Figure 7. In this case a screw D with a large head screws into
the contact base B and a hole a bored through said head is at each turn of the
screw brought opposite to a similar hole a¹ in the contact base B, shown by a.
This hole a is coincident with a hole in the insulating base A through which the
conductor passes. The barèd end of said conductor passing through the holes a a¹,
and the screw D being screwed home, a slight twist is given to the free end,
which results in a perfect contact apart from the mere compression due to the
rotation of the 'screw D.
I

page_text: A
We may further modify the improved terminal according to our invention by
employing a screw with an eccentric or cam head, this being shown by the part
sectional elevation Figure 8 and the corresponding plan view Figure 9. In this
case as in the former, the screw D has its axis parallel to the conductor.
semicircular recess E is formed upon the contact base B, and the conductor is
harèd and passed up through the hole a in the contact base B. A turn of the
eccentric or cam headed screw D grips this firmly against the face of the recess E,
thus making a firm contact, also locking the screw D in position. In each modifi-
cation herein described, the act of securing perfect electrical contact also locks the
screws.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
-
First. In terminals for electrical connections especially adapted to incandescence
electric lamps, the construction and use of a screwed stud C with a hole a in com-
bination with a screwed sleeve nut D, as and for the purposes herein described with
reference to Figures 1, 2, 3 and 4 of the appended drawings.
Second. In terminals for electrical connections especially adapted to incan-
descence lamps the construction and use of a screw D. with a hole a engaging
with a threaded hole in the contact block B so as to wrap the free end of the con-
ductor round it in tension substantially as and for the purposes herein described,
with reference to Figure 5 of the appended drawings.
Third. In terminals for electrical connections especially adapted to incan-
descence electric lamps, the construction and use of a screw D, with an axis
parallel to the conductor to be held having a hole a¹ in the head corresponding
to a similar hole a in the contact base B substantially as and for the purposes
herein described, with reference to Figures 5 and 6 of the appended drawings.
Fourth. In terminals for electrical connections especially adapted to incan-
descence electric lamps, the construction and use of a screw D with an eccentric
or cam head in combination with a recess E upon the contact block B and hole a
substantially as and for the purposes as herein described with reference to
Figures 7 and 8 of the appended drawings.
Fifth. The method of, and means for establishing electrical contact between
terminals and barèd conductors, and also locking the screws thereof, substantially
as herein described and shown by the appended sheet of drawings.
Dated this 20th day of Santambor 1908
FREDK. WALKER,
73, St. Stephen's Road, Upton Park, London, E.,
Agent for the Applicants.