Improvements in Holders for Incandescent Electric Lamps.
Year: 1889

page_text: Date of Application, 27th June, 1889
Complete Specification Left, 27th Mar., 1890-Accepted, 3rd May, 1890
PROVISIONAL SPECIFICATION.
Improvements in Holders for Incandescent Electric Lamps.
I HENRY BAYLEY trading as Bayley Brothers, of Selborne Works, Walsall in the
County of Stafford, Electrical fitting Manufacturer, do hereby declare the nature of
this invention to be as follows :-
This invention has for its object simple means for facilitating the attachment and
disconnection of the head or cap of a holder for an incandescent electric lamp and
the socket or case thereof for the purpose of wiring the holder.
According to this invention the attachment between the head and socket is effected
by means of a bayonet joint which is locked by a spring. In the upper edge of the
socket are formed a pair of L-shaped slots which constitute the female portions of the
joint. These slots are engaged with studs carried by the head. One or more springs
are carried by the head in such position that they are compressed by the socket as it
is pushed up into position to be engaged with the studs. To attach the socket its
upper edge is first pushed up with such force as will compress the spring or
springs sufficiently to allow the slots to engage, as one of the parts is turned in
relation to the other, with the studs, and the connection is then made by turning one
of the parts in relation to the other so as to engage the slots with the studs. The
horizontal portions of the slots are notched up slightly at their inner ends, and the
joint is locked by the reaction of the spring or springs forcing down the socket
and engaging the notches with the studs. The parts may be readily detached by
first pressing up the socket so as to unlock the notches from the studs; or the
studs and notches may be shaped so that the turning of the parts in relation to
one another in a direction to unfasten the joint will move up the socket against
the pressure of the spring or springs and thus unlock the notches from the
studs.
It is convenient to form an annular groove in the under side of the head for the
reception of the upper end of the socket, and to insert a coiled spring within the groove
to act as the spring against the pressure of which the socket is pushed up. In
this case the studs pass across the groove in front of the spring and constitute
the male portions of the joint and also prevent the spring from moving out of
the groove.
It will be seen that, according to this invention, no parts have to be screwed or
unscrewed in making the attachment between the head and socket, or in detaching
them from one another.
يوم
1
CT 1000
STEPHEN
WATKINS,
Walsall and Wolverhampton, Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Holders for Incandescent Electric Lamps.
I, HENRY BAYLEY, trading as Bayley Brothers, of Selborne Works, Walsall in the
County of Stafford, electrical fitting manufacturer, 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 simple means for facilitating the attachment and
disconnection between the head or cap of a holder for an incandescent electric lamp
and the socket or case thereof, for the purpose of wiring the holder.
According to this invention, the attachment between the head and socket is effected
by means of a bayonet joint which is locked by a spring. In the upper edge of the

page_text: socket are formed a pair of L-shaped slots which constitute the female portions of the
joint. These slots are engaged with studs carried by the head. One or more springs
are carried by the head is such position that they are compressed by the socket as it is
pushed up into position to be engaged with the studs.
A modification of this invention is illustrated by figures 1 and 2, of which figure 1 is
a vertical section through a holder, and figure 2 an elevation thereof as seen at right
angles to figure 1, with a portion of the front wall of the groove, hereinafter referred
to, shewn as if broken away to expose one of the slots of the bayonet joint and the
stud with which it engages. An annular groove a is formed in the head A of the
holder for the reception of the upper end of the socket B. A coiled spring bis
inserted within the groove a, and a couple of pins c are fixed in place transversely
across the groove, as shewn, on opposite sides thereof. L-shaped slots d are formed
one in each side of the upper edge of the socket B for engagement with the pins c;
and the joint is made by entering the upper edge of the socket within the groove in
position for the vertical portions of the L-shaped slots d to pass over the pins cand
then pushing the end of the socket into the groove, and against the pressure of the
spring b, sufficiently to permit of one of the parts (namely the head A and socket B)
being turned in relation to the other and thus bringing the pins into the horizontal
portions of the slots. The re-action of the spring b then presses the upper sides of the
horizontal portions of the slots firmly upon the pins and prevents the joint from readily
becoming accidentally disconnected. It is preferred, however, to form a notche e in the
inner end of the upper edge of the horizontal portion of each slot whereby the joint is
more securely locked. In this latter case the socket is pressed up slightly in discon-
necting it from the head, so as to clear the notches from the pins, before turning one of
the parts in relation to the other. The upper edges of the horizontal portions of the
slots may be inclined so that while the parts will be securely locked together they may
be disconnected by simply turning one of them in relation to the other, the movement
of the inclined edges against the pins causing the socket to move in somewhat against
the
pressure of the spring.
A further modification of this invention is illustrated by the remaining figures, of
which figure 3 is a corresponding section of figure 1, figure 4 an elevation of the
holder as seen at right angles to figure 3, figure 5 a section on line 2 of figure 3,
and figure 6 a plan of the upper edge of the socket. A stud f projects from the side
of the lower portion of the head A¹, and a stud g projects through a hole in the
side of the bead, as shewn, in position opposite to the stud f. The stud g has a
head on its inner end against which presses a spiral spring h carried within a hole
drilled into the insulating material k. The stud g may consequently be pressed
in against the pressure of the spring h. L-shaped slots are formed in the
upper edge of the socket B', but one of them, namely the slot (and preferably
both of them, as shewn) instead of being cut clear out through the thickness of
the metal, are pressed or embossed out from the inside so as to leave an L-shaped
groove or channel open to the inside of the socket. As the studs and slots are
small and are difficult to bring out very clearly in section, even when drawn full
size as in the case of figures 3 to 6 inclusive, an enlarged vertical section through
the slot and stud f. is shewn by figure 7. A clear opening is formed through
the inner end of the horizontal portion of the slot 2, through which the stud g
projects to lock the joint, as shewn, and as will be immediately described. To
couple the head and socket together the stud g is pressed in to allow the vertical
part of the slot or groove ¹ to be passed over it. The socket is then pushed
up, the vertical parts of the slots passing over the studs, and is then turned till
the stud is opposite the clear opening through the inner end of the horizontal
portion of the slot upon which such stud springs through such opening and
locks the joint. To unfasten the joint the stud g is first pressed in to allow of
the socket being turned in the reverse direction.
The slot i may of course be cut clear through the metal of the socket, if desired, but
is neater when made as above described, as in such case the stud fis completely hidden
when the parts are put together. The stud f, however, may be pressed out by a spring

page_text: if desired and operate as the stud g, in which case an opening would be formed
through the inner end also of the horizontal portion of the slot i. There is no need,
however, for the extra complication thus involved.
By making the upper end of the socket a fairly easy fit around the head and
giving the stud g a somewhat short projection beyond the side of the head (but
sufficient of course to lock the parts together when in position therefor) the socket
may be first pushed in a somewhat slanting position on to the head so that the
wall of the slot will just cover the end of the stud g, and thus as the parts
are pushed together and the socket assumes a parallel position in relation to the
head, the stud will be pressed in. In such case the need for pushing in the stud
with one hand while the socket is put into position with the other will be avoided ;
but the trouble of pushing in the stud by hand is in any case a very trifling
affair.
It will be seen that, according to this invention, no parts have to be screwed or
unscrewed in making the attachment between the head and socket, or in detaching
them from one another.
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
1. A holder for an incandescent electric lamp in which a removable socket is
connected with the head by means of a bayonet joint of which either the female
portions or slots are pressed down by spring pressure upon the male portions thereof,
or one or both of the male portions or studs are correspondingly pressed forwards
through or into an opening or openings in the inner end or ends of one or both the
female portions, substantially as described and shewn for the purpose set forth.
2. A holder for an incandescent electric lamp in which the connection between the
head and socket is made in the manner substantially as described with reference to
figures 1 and 2, for the purpose set forth.
3. A holder for an incandescent electric lamp in which the connection between the
head and socket is made in the manner substantially as described with reference to
figures 3 to 7 inclusive, for the purpose set forth.
Dated this 26th day of March 1900
STEPHEN WATKINS,
Walsall and Wolverhampton, Agent for the Applicant.