Improvements in Lamps for Sewing Machines and other purposes.
Year: 1893

page_text: Date of Application, 4th Dec., 1893-Accepted, 27th Jan., 1894
COMPLETE SPECIFICATION.
Improvements in Lamps for Sewing Machines and other purposes.
I, FRIEDRICH BERNHARD BARTHEL, Mechanic, of Langgasse, No. 53, Wetzlar
a/Lahn, in the Empire of Germany, 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 and accompanying drawing, that is
to say :-
Sewing machines have been largely improved in almost every point of their
construction but one point has hitherto been neglected, that is to say the method of
lighting, so that they can be advantageously used after dark, especially in family
use, the lamps ordinarily used for such conditions not possessing the necessary
qualifications of convenience and safety.
If such an ordinary oil lamp is placed upon a sewing machine, it is in the first
place liable to fall from the constant shaking of the machine, and in the second
place it hinders the work as it interferes with the proper arrangement and movement
of the latter, and damage is constantly caused to it.
The present invention has for its object an improved method of making and
carrying the lamp by which these objections are removed.
In the accompanying drawing, which is in illustration of the invention,
Figure 1 is a vertical section through the lamp, with the oil holder removed.
Figure 2 is a plan shewing the arrangement of the sewing machine, Figure 3 is
a general view of the same.
As shewn in Figure 1, the foot and the oil-holder of the lamp, in the ordinary
lamp, are separate.
The foot a is provided above with a conical socket b, which has a flat spring c
and pin or stud d, which latter projects through a hole into the interior of the
socket.
The oil-holder is provided at the bottom with a corresponding conical projection
which has a groove having at its upper end a hole e.
If the projection in the oil-holder is inserted into the socket, the pin d is forced
by the spring into the hole e, and the foot or stud, and the oil holder, are held firmly
and securely attached together.
If the lamp is to be used for the sewing machine, the stud d is withdrawn by
means of the projecting end of the spring so that it no longer engages with the.
hole e in the projection at the bottom of the oil-holder, and the latter can then be
raised out of the socket b, and transferred to the sewing machine in the following
way. Upon the machine arm (Figures 2 and 3) is cast or otherwise fixed an arm
bent laterally and up, its outer end having pivotted to it a jointed arm g, g, the
separate parts of which are pivotted together, its outer end being provided with a
conical socket h, similar to the one shewn in Figure 1, and fitted in the same way
with a spring and stud d, which latter fits into the hole e in the side of the conical
projection below the oil-holder. The jointed links of the arm g turn sufficiently
stiffly upon their pivots so that the lamp can be easily adjusted into any desired
position above the sewing machine, whilst the devices described secure absolute
safety against falling.
An arrangement for securing stiffness in the joints of the arm to prevent them
from moving, is shewn in Figures 2 and 3, in which a spring i is arranged in a recess
the spring fitting between the arm itself and the screw which forms the pivot.
Security agaiust movement may be further secured by tightening the joint when
the lamp has been adjusted in the required position.

page_text: The conical socket at the outer end of the arm is provided with a groove round
its lower end, into which the spring hook-shaped projections upon the oil-catcher
shown in Figure 4 engage.
The object of this oil catcher is to receive any oil running down from the oil-holder,
and prevent it from falling upon the machine and dirtying the work. The
oil catcher can, by means of its spring projections, be easily attached to or removed
from the socket.
In order to prevent any rattling of the lamp in its holder whilst work is in
progress, a soft lining may be inserted in the socket or round the conical projection
at the bottom of the oil-holder.
By the use of the improved devices described and illustrated, work can be
safely and easily carried on upon sewing machines after dark.
1
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 :-
A lamp for sewing machines, the foot and the oil-holder of which are made
separate, the oil holder having a conical projection upon its lower side which fits
either into a corresponding socket upon the foot, where it is held by the spring and
stud d, or into a similar socket upon a jointed arm carried by the arm of the sewing
machine, the necessary security against the falling of the lamp being afforded, and
an oil-catcher (Figure 4) guarding against the dropping of oil upon the work, and
the necessary adjustment and fixing of the lamp upon the machine being provided,
as shewn in Figures 2 and 3, substantially as described and illustrated.
Dated this 4th day of December 1893.
EDWARDS & Co.,
35, Southampton Buildings, London, Agents for the Applicant.