IMPROVEMENTS IN ATTACHING LAMPS TO CARRIAGES AND OTHER ARTICLES "
Year: 1882

page_text: LETTERS PATENT to Robert James Dobbs of Birmingham in the County of
Warwick Manager of Works and Franklin Davies of Birmingham aforesaid
Brassfounder for an Invention of "IMPROVEMENTS IN ATTACHING LAMPS TO
CARRIAGES AND OTHER ARTICLES "
PROVISIONAL SPECIFICATION left by the said Robert James Dobbs and
Franklin Davies at the Office of the Commissioners of Patents on the
23rd November 1882.
ROBERT JAMES DOBBS of Birmingham in the County of Warwick Manager of
Works and FRANKLIN DAVIES of Birmingham aforesaid Brassfounder "IMPROVE-
MENTS IN ATTACHING LAMPS TO CARRIAGES AND OTHER ARTICT.ES "
Our invention consists of the improvements hereinafter described which improve-
ments are especially applicable to the attaching of carriage lamps to carriages but
are also applicable to attaching lamps to other articles.
By our improvements lamps are very readily and securely attached to carriages
or other articles and the unsightly sockets ordinarily used are dispensed with.
We will describe our invention as applied to the attaching of lamps to carriages.
In attaching carriage lamps to carriages according to one of our improvements
we make on the end of the lamp iron a short tubular collar or ring. This ring is
flat on its upper face excepting that in a line with the stem part of the iron a
dovetail taper projection is made. That haf of the ring which is situated most
distant from the stem is made of less diameter than the half nearest the stem the
reduced half joining the other half by shoulders at the outer edge of the ring.
We fix at the bottom of the carriage lamp a seat ring having a figure nearly
the counterpart of that of the ring described on the lamp iron. That is to say on
the underside of one half of the lamp ring is an undercut seat which can be made
to engage with or seat itself upon the reduced half of the lamp iron ring and in
the edge of the lamp ring is a dovetail slot or opening which can be made to
engage with or seat itself upon the dovetail projection on the lamp iron ring. The
inner edge of the lamp ring is furnished with a concave screw.
ГД....

page_text: In connecting the carriage lamp to the lamp iron the ring on the bottom of
the said lamp is engaged by a sliding motion with the ring on the lamp iron
the undercut seat and dovetail slot of the lamp ring respectively engaging with or
seating themselves upon the reduced half and dovetail projection of the lamp iron
ring. The carriage lamp is thereby prevented from rotating on the lamp iron. We
prevent the seat ring on the lamp from sliding off the lamp iron ring by using a
separable candle tube the upper end of which is screwed and takes into the screwed
part of the lamp ring.
When the said candle tube is screwed home a shoulder below its screw takes a
bearing against the underside of the lamp iron-ring. The carriage lamp ring is
thereby fastened very firmly to the lamp iron ring and the lamp thus fixed in its
place.
In order to detach the lamp from the lamp iron it is necessary first to unscrew
the separable candle tube of the lamp. The seat ring on the bottom of the lamp
is thereby unfastened and may be withdrawn by a sliding motion from the lamp
iron ring.
Another of our improvements consists of the following modification of the seat
and lamp iron rings.
Instead of making the seat and lamp iron rings in the manner described we
make across the upper face of the lamp iron ring a taper dovetail and we make
across the lower face of the lamp iron ring a corresponding taper dovetail recess
for engaging by a sliding motion with the taper dovetail on the lamp iron. A
separable screwed candle tube is used for fastening-the-engaged parts together as
first described.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Robert James Dobbs and Franklin Davies in the Great Seal Patent
Office on the 16th May 1883.
ROBERT JAMES DOBBS of Birmingham in the County of Warwick Manager of
Works and FRANKLIN DAVIES of Birmingham aforesaid Brassfounder "IMPROVE-
MENTS IN ATTACHING LAMPS TO CARRIAGES AND OTHER ARTICLES
"
Our invention consists of the improvements hereinafter described, which improve-
ments are especially applicable to the attaching of carriage lamps to carriages but
are also applicable to attaching lamps to other articles.
By our improvements, lamps are very readily and securely attached to carriages
or other articles and the unsightly sockets ordinarily used are dispensed with.
We will describe our invention as applied to the attaching of lamps to
carriages.
In attaching carriage lamps to carriages according to one of our improvements
we make on the end of the lamp iron a short tubular collar or ring.
This ring is flat on its upper face excepting that in a line with the stem part
of the iron a dovetail taper projection is made. That half of the ring which is
situated most distant from the stem is made of less diameter than the half nearest
the stem, the reduced half joining the other half by shoulders at the outer edge of
the ring.
H
We fix at the bottom of the carriage lamp, a seat ring having a figure nearly the
counterpart of that of the ring described on the lamp iron. That is to say, on the
underside of one half of the lamp ring is an undercut seat which can be made to
engage with or seat itself upon the reduced half of the lamp iron ring and in the
edge of the lamp ring is a dovetail slot or opening which can be made to engage
with or seat itself upon the dovetail projection on the lamp iron ring. The inner
edge of the lamp ring is furnished with a concave screw. In connecting the
carriage lamp to the lamp iron the ring on the bottom of the said lamp is engaged
by a sliding motion with the ring on the lamp iron, the undercut seat and dovetail
slot of the lamp ring respectively engaging with or seating themselves upon the
reduced half and dovetail projection of the lamp iron ring. The carriage lamp is
thereby prevented from rotating on the lamp iron. We prevent the seat ring on
the lamp from sliding off the lamp iron ring by using a separable candle tube the
upper end of which is screwed and takes into the screwed part of the lamp ring.
When the said candle tube is screwed home a shoulder below its screw takes a
bearing against the underside of the lamp iron ring. The carriage lamp ring is
thereby fastened very firmly to the lamp iron ring and the lamp thus fixed in its
place.
In order to detach the lamp from the lamp iron it is necessary first to unscrew
the separable candle tube of the lamp. The seat ring on the bottom of the lamp is
thereby unfastened and may be withdrawn by a sliding motion from the lamp
iron ring.
Another of our improvements consists of the following modification of the seat
and lamp iron rings.
Instead of making the seat and lamp iron rings in the manner described we
make across the upper face of the lamp iron ring a taper dovetail and we make
across the lower face of the lamp ring a corresponding taper dovetail recess for
engaging by a sliding motion with the taper dovetail on the lamp iron. A
separable screwed candle tube is used for fastening the engaged parts together as
first described,
We will now proceed to describe with reference to the accompanying Drawings
the manner in which our invention is to be performed.
Figure 1 represents in side elevation (partly in vertical section) and Figure 2 in
front elevation, a carriage lamp attached to the lamp iron on the carriage according
to one of the arrangements of our invention; Figure 3 is a plan of the underside

page_text: .
of the lamp exhibiting the taper dovetail recess; Figure 4 represents in plan and
side elevation the lamp ring with its dovetail recess detached from the lamp;
Figure 5 represents in plan of upper side and in side and end elevations the lamp
iron ring and its taper dovetail; Figure 6 represents a portion of the separable
candle tube of the lamp and Figure 7 represents the screwed collar which is fixed
to the candle tube, detached.
The same letters of reference indicate the same parts in Figures 1, 2, 3, 4, 5, 6
and 7.
a is the body of the carriage lamp and b is the separable candle tube of the lamp
provided with the screwed collar c. This screwed collar has at its bottom a
shoulder d for the purpose hereinafter explained. On the underside of the body of
the lamp, a ring e is fixed and on the end of the lamp iron f is a ring g. Across
the upper face of the lamp iron ring g a taper dovetail h is made and across the
lower face of the lamp ring e a corresponding taper dovetail recess i is made which
can be engaged by a sliding motion with the taper dovetail h on the lamp iron ring g.
The inner edge of the lamp ring e is screwed with a hollow screw k of a size
suitable for the screwed collar c on the candle tube b to engage with.
In connecting the carriage lamp to the lamp iron on the carriage, the separable
candle tube b is unscrewed from the ring e of the lamp and the wide end of the
dovetail recess in the said ring being presented to the narrow end of the taper
dovetail h on the lamp iron ring g the said dovetail recess is engaged by a sliding
motion with the taper dovetail on the said lamp iron ring as represented in Figures
-1 and 2. The separable-candle tube b is now connected to the lamp by its upper
end being passed through the central openings in the lamp iron ring g and lamp
ringe into the body of the lamp and the screwed collar c on the upper end of the
said candle tube is screwed into the screw k of the lamp ring until the shoulder d
takes a bearing against the underside of the lamp iron ring as represented in
*Figure 1. The lamp ring e is thereby prevented from sliding off the lamp iron
ring g and the carriage lamp is securely connected to the lamp iron on the
carriage.
In order to detach the lamp it is first necessary to unscrew the candle tube b
from the lamp ring e when the said lamp ring may by a sliding motion be with-
drawn from the dovetail on the lamp iron ring g.
In adapting this part of our invention to carriage lamps having fixed or
inseparable candle tubes, we modify the parts of the fastening in the manner
.represented in plan of underside of the lamp and lamp iron in Figure 8 plan of
upperside of the lamp iron in Figure 9; plan of the underside of the lamp ring or
plate in Figure 10 and longitudinal section of the lamp ring or plate connected to
the lamp iron in Figure 11. In this modification we make the lamp iron ring
open at the side opposite that which is connected to the lamp iron so as to give a
forked figure to the lamp iron as shown at l Figure 9, the said forked portion of
the lamp iron having on its upper face a taper dovetail h. The ring or plate e on
the bottom of the lamp body, in which plate the taper dovetail recess i is inade, has
a plain opening in it through which the candle tube is passed the said candle tube
being fixed permanently to the lamp in the ordinary way, and the narrow end of
the dovetail recess i is closed, that is, the dovetail recess i.does not completely
extend across the lamp ring or plate, the end e³ of the recess having a thickness
suitable for covering the open end of the fork of the lamp iron when the lamp is
fixed in its place as seen in Figure 11.
In connecting the carriage lamp having a fixed candle tube to this lamp iron, the
dovetail recess i on the bottom of the lamp is engaged by a sliding motion with
the dovetail h on the forked lamp iron in the manner hereinbefore described, the
fixed candle tube passing into the opening between the forked end of the lamp
iron f. The withdrawal of the lamp from the lamp iron is prevented in this
modification by the thumb screw m, inseparable from the lamp iron f, being made
to take into a plain hole n at the back part of the lamp ring or plate e as seen in
Figure 11.
-

page_text: Figures 12 to 21 represent another arrangement of our invention in which an
undercut seat is made on one part of the lamp iron ring for a portion of the lamp
ring to seat itself upon in addition to a dovetail fastening: Figures 12 and 13.
represent plans of under and upper sides of the lamp iron; Figure 14 is a
side elevation of the same; Figures 15 and 16 represent plans of under and
upper sides of the lamp ring and Figure 17 is a side elevation of the same;
Figure 18 represents in longitudinal section and Figure 19 in plan the lamp
ring connected to the lamp iron; Figure 20 represents the screwed collar which is
fixed on the separable candle tube of the lamp and Figure 21 represents a portion
of a lamp in side elevation with the lamp iron and lamp ring in section.
The ring on the end of the lamp iron f is marked p, q the upper face of the said
ring being flat. The front part of the ring is of less diameter than the back
part p, the two parts being joined by shoulders at r r. On the back part p of the
ring and in a line with the stem of the lamp iron f is a dovetail taper projection 8.
The seat ring on the bottom of the carriage lamp is marked t. On the underside of
the back half of the said ring t is an undercut seat q² for the reduced front part q
of the lamp iron ring to engage with. At the front of the lamp ring t is a dovetail
recess 83 for taking upon or engaging with the dovetail projection 8 on the lamp
iron ring.
In connecting the lamp by means of this construction of fastening, the candle
tube being unscrewed from the lamp, the ring t on the bottom of the lamp is
engaged by a sliding motion with the ring on the lamp iron the undercut seat q²
and dovetail slots of the said lamp ring respectively engaging with or seating
themselves upon the reduced half q and dovetail projection 8 of the lamp iron ring.
The two rings are next locked together by screwing the screwed end c of the
candle tube into the screwed part of the lamp ring as before described with respect
to Figures 1 and 2.
Our improvements are applicable to the attaching of lamps to other articles
besides carriages, such for example as tricycles and other velocipedes and generally
all articles to which it may be desired to attach lamps by means of arms.
Having now described the nature of our Invention and the manner in which the
same is to be performed we wish it to be understood that we Claim as our invention
of "Improvements in attaching lamps to carriages and other articles."
First Attaching lamps to lamp irons fixed on the carriages or other articles, by
means of a taper dovetail recess at the bottom of the body of the lamp being made
to engage with a corresponding dovetail on the end of the lamp iron, whether the
said lamps be provided with separable candle tubes or with fixed candle tubes, the
several parts of the fastenings being constructed and arranged substantially as
herein before described and illustrated in Figures 1 to 11 both inclusive of the
accompanying Drawings.
Secondly Attaching lamps to lamp irons by constructing and arranging the
parts of the fastening substantially as herein before described and illustrated in
Figures 12 to 21 both inclusive of the accompanying Drawings.
In witness whereof I the said Robert James Dobbs have hereunto set my
hand and seal this Tenth day of May in the year of our Lord one thousand
Witness,
RICHARD SKERRETT
37 Temple Street
Birmingham.
ROBERT JAMES DOBBS (LS.)