An Improved Rosette for Electric Wires.
Year: 1893

page_text: Date of Application, 29th Dec., 1893-Accepted, 17th Feb., 1894
COMPLETE SPECIFICATION.
Communicated from abroad by WILLIAM BRISBANE RAND, of 42, Magnolia
Street, Boston, County of Suffolk, State of Massachusetts, United States of
America, Broker.]
An Improved Rosette for Electric Wires.
I, HENRY HARRIS LAKE, of the Firm of Haseltine Lake & Co., Patent Agents,
45 Southampton Buildings, in the County of Middlesex, 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 :-
My invention has for its object to provide an improved rosette for electric wires
which shall be adapted to receive a suitable fuse or fuses; shall be simple, durable
and of high efficiency and in which the number of parts employed shall be reduced
to a minimum. My invention is fully set forth in the following Specification and
its novel features are pointed out in the claims which are appended hereto.
My invention, as embodied in the best form now known to me, is shown in the
accompanying drawings to which reference is made in the following description,
and in which
Fig. 1 is a plan view and Fig. 2 is a side view of a rosette embodying my
invention.
Fig. 3 is a section looking down from line 3-3 Fig. 2, and showing the fuses in
position.
Fig. 4 is a plan view of the removable fuse block showing the reverse side
thereof from that which is shown in Fig. 3..
Fig. 5 is a similar view to that shown in Fig. 3 but with the fuse block
removed.
The body of my device, that is the rosette aside from the fuse block and contact
pieces, comprises a base block 1, and a hollow bulb or cap 2; these are preferably
shaped as shown, but the precise shape is unimportant, and may be varied as
desired, provided that the base block extends sufficiently beyond the bulb or cap to
afford a backing or support for the feed wire contacts hereinafter referred to.
What I have termed the body of the rosette which is preferably integral
throughout and which comprises the base block and bulb is preferably made from
porcelain which may be moulded to the required form and then fired or baked in
the well known manner. The base block is provided preferably at each end outside
the bulb with projecting portions or lugs 30 in each of which is formed a trough-
shaped groove 3, said grooves being provided for the reception of the feed wires,
one of which is shown at 4, Figs. 1 and 2. At each end of said base block and
extending to the ends of the lugs 30 and across, or inward from, the trougl-shaped
grooves 3, is formed a slot or groove 5, said grooves having their inner ends
extending toward the centre of the base block and within the cavity of the hollow
bulb or cap 2. The said slots 5 are for the reception of contact pieces 6, which are
placed therein and which are secured in place by the screws 7 which pass through
threaded holes in said contacts and project into holes or sockets formed in the base
block. Since the ends of the screws 7 project into said sockets in the base block,
end wise movement of the contacts 6 in their sluts is prevented, and the contacts are
securely held in position without the aid of additional screws or securing devices.
The screws 7 also serve as binding screws to secure the feed wires 4 to the
contacts 6. The bulb 2 is provided with an interior cavity as previously stated,
and is also slotted transversely so that the said slot or aperture crosses the line of
the contacts 6 and serves for the reception of the fuse block 8. This fuse block
slot crosses the inner ends of each of the contacts 6 and is shown in end view at 9,
DO77

page_text: Fig. 2, and by dotted lines 10, in Fig. 1. The fuse block is formed preferably
from an insulating composition and is provided with four contact pieces shown
at 11, 12, 13 and 14, Figs. 3 and 4. Said fuse block is of a size to fit the slot 9
snugly and is adapted to be inserted in or withdrawn from the said slot or aperture.
The contact pieces 11 and 13 of the fuse block are fitted snugly in holes formed
through said block at each end thereof and the contacts 12 and 14 are fitted in the
same manner in the openings or holes formed at each side of the said fuse block.
These contacts are so fitted to the holes which are formed to receive them that
when forced into the holes they will remain securely therein. Extending between
the contact pieces 11 and 12, and 13 and 14, respectively, and on the upper side of
the fuse block, that is the side which is next the base block of the rosette when the
fuse block is in position therein, are formed trough-shaped grooves or cavities 15,
which are provided for the reception of the fuses 16 which extend between, and are
in contact with, the contact pieces 11 and 12, and 13 and 14, respectively. Said
contact pieces are provided with binding screws and metal washers, in the usual
manner, or they may be provided with any well known binding device for securing
the fuses in place. When the fuse block is in position in the rosette, the contact
pieces 12 and 14 are in operative connection with the inner ends of the contact
pieces 6, previously described. The bulb 2 is provided preferably at each side
thereof with openings 17 which enter the interior cavity 18 of the bulb and which
are preferably of the shape shown Fig. 5. In each of these openings a contact
piece 19 is secured by means of a securing screw or other suitable device, a suitable
recess being formed for the reception of these contact pieces. If a screw be
employed, it may be inserted from the exterior of the bulb the screws 20), Fig. 1,
being employed for this purpose. The lamp cords 21 are passed through a hole in
the centre of the bulb 2, said cords being preferably knotted inside the bulb in
order that any strain on the cords may be borne by the knot and not transmitted to
the binding screws or contacts. The ends of said cords are secured by the binding
screws 22 of the contact pieces 19. When the fuse block is in position, the said
contact pieces 19 are in operative connection with the contact pieces 11 and 13 of
said block.
The electrical connection is as follows:-The current may pass in by the feed
wire 4, thence by the contact piece 6 to the contact piece 12, thence through the
fuse 16 to the contact piece 11, thence to the contact piece 19 thence through one
of the lamp cords 21 to the lamp; thence through the other lamp cord to the other
contact 19, thence through the contact 13 and the other fuse 16 to the contact 14,
thence out through the opposite contact 6.
I prefer to construct the fuse block of a sufficient size to project entirely across
the bulb 2, as shown, in which case the slot 9 for the reception of the said block is
carried through the bulb from side to side thereof. It is not, however, essential
that said fuse block should extend entirely across said bulb, in which case, the slot
or opening for its reception would not extend across the said bulb, but only through
one side thereof.
In case it is deemed necessary springs, indicated at 32 may be placed in the
base block in such manner as to bear upon the contact pieces 6, a spring being
employed for each contact piece and being placed in a cavity or recess provided
for its reception in the bottom of the grooves 5 of the base block or the grooves
may be slightly deepened to receive said springs. These springs will operate to
force the contacts 6 against the fuse block contacts 12 and 14 and thus insure
better electrical connection between these parts. The force of these springs will
also be transmitted to the fuse block, and will force its contacts 11 and 13 closely
against the contact pieces 19 of the bulb, thus insuring more perfect electrical
connection throughout the contact pieces of the device. The holes shown at 33
are for the reception of the securing screws by means of which the rosette is
secured to the ceiling or other support to which it is to be applied. These holes
pass through the solid portion of the body of the rosette and thus do not open
into the interior cavity of the bulb.

page_text: The
My invention provides a rosette adapted to contain a fuse or fuses having a
removable fuse block so that a fuse may be supplied without taking the rosette
apart or disturbing the lamp or lamps which are connected therewith.
location of the fuses in the rosette is such that they are entirely separated from the
lamp cord by an intervening mass of insulating material, so that in case the fuses
are burned out neither the lamp cord wires nor their covering will be destroyed or
impaired. The holes by means of which the rosette is secured in position on the
wall or ceiling pass through the solid body of the rosette, and therefore cannot
form leadways to convey moisture or the like to any portion of the electrical
connections, and short circuiting or the like cannot result from moisture passing
through these holes. By removing the fuse block which may be readily done, the
position and condition of the ends of the lamp cords within the bulb may be
observed, and whether or not they are knotted, may be easily determined when the
fuse block is removed, by simply seizing the lamp cords at a point below the bulb
and forcing them up slightly thus raising the knot into plain view through the fuse
block orifice.
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 by my
foreign correspondent, I declare that what I claim is :-
1. A rosette for electric wires having an internal cavity in the body thereof
and having slots for the feed wire contact pieces extending from the exterior of
said body to the interior cavity thereof, and having a slot transversely of said
feed wire contact slots for the reception of a fuse block, said last mentioned slot
also extending to the exterior of the said body, substantially as set forth.
2. A rosette for electric wires having a removable fuse block and having external
contacts for the feed wires, and external contacts for the lamp wires, said external
contacts being in operative connection with the fuse contacts when the fuse block
is in position, substantially as set forth.
3. A rosette for electric wires comprising a base block, a hollow bulb, a
removable fuse block and suitable contact pieces said fuse block being provided
with a fuse or fuses located on the opposite side of said block from the lamp cords,
whereby when a fuse is burned the lamp cords are protected from injury, sub-
stantially as set forth.
4. A rosette for electric wires comprising a hollow bulb having lugs or
projectious exterior thereto, and having feed wire contacts extending from the
exterior of said bulb to the interior thereof in slots formed for their reception,
said feed wire contacts being held in place in said slots by the ends of the binding
screws of said contacts, said binding screws projecting into recesses or sockets in
the said Ings, substantially as set forth.
5. A rosette for electric wires having an interior cavity for the ends of the lamp
cords, slots opening into said cavity for the feed wire contact pieces and a slot for
the reception of a fuse block, a removable fuse block and holes located wholly in
the solid part of the rosette for the reception of the securing screws, whereby the
rosette may be secured in position, substantially as set forth.
6. A rosette for electric wires, having a removable fuse block, and having
suitable feed wire contacts located at one side of the said fuse block and suitable
lamp cord contacts located on the opposite side of said fuse block, said fuse block
being provided with suitable contact pieces and a fuse or fuses, whereby by the
insertion of the fuse block electrical connection is established between the feed
wires and the lamp, substantially as set forth.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.