Year: 1886

page_text: Date of Application, 27th Nov., 1886.
Complete Left, 25th July, 1887.
Complete Accepted, 26th Aug., 1887.
I.JOSEPH WERTHEIM of Frankfort on the Main in the Empire of Germany do
hereby declare the nature of this invention to be as follows:-
I
This Invention relates to the construction of the table top of a sewing machine stand
and has for its object to render the same although constructed mainly of wood
sufficeintly non-sonorous to deaden the noise caused by working the machine.
thus obtain a table top of cheap and light construction devoid of the objectionable
sonorous qualities of ordinary wooden tops.
Referring to the accompanying drawings:
I make the table top of two superposed plates of wood BC separated by a sheet of
non sonorous material preferably lead, the upper plate C being entirely sheathed in
that metal and the whole being glued or cemented and rivetted together, in order to
thoroughly exclude air, which if present would add to the sonorous quality of the table.
The rivets are brass tubes which, to exclude air and prevent sound-conducting
contact between the rivets and the wood, are sheathed in lead. The lead covering the
edges of the upper wooden plate (which is slightly smaller than the lower one) is
soldered to the sheet of lead intervening between the two wooden plates, so that the
upper one is wholly sheathed or encased in lead, and as the machine rests on
this lead encased plate the transmission of the sound waves to the under plate is
greatly or altogether impeded, the lead absorbing them in the same way that dark
colors absorb light-rays. The lead encased upper plate C is surrounded and protected
by a beading or frame as shewn.
Instead of the wire gauze drawer, hitherto employed a similar one of wood is used,
the bottom of which consists of sheet metal strips fixed to the frame of the box and
covered with oil cloth.
This box is likewise noiseless.
J. WERTHEIM.
By A. M. & Wm. Clark,
53, Chancery Lane, London,
Patent Agents,

page_text: I, JOSEPH WERTHEIM of Frankfort on the Main 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:
This Invention relates to the construction of the table top of a sewing machine
stand; and has for its object to render the same, although constructed mainly of wood,
sufficiently non-sonorous to deaden the noise caused by working the machine. Í
thus obtain a table-top of cheap and light construction devoid of the objectionable
sonorous quality of ordinary wooden table tops.
Referring to the accompanying drawing;-figure 1 of which shows a plan and
figure 2 a longitudinal section of the table-top. I make the table-top of two super-
posed plates of wood BC separated by a sheet of non-sonorous material preferably
lead, the upper plate C being entirely sheathed in that metal and the whole being
glued or cemented and rivetted together in order to thoroughly exclude air which if
present would add to the sonorous quality of the table. A sheet of lead is glued to
the upper surface of the lower plate, and another sheet to the upper surface of the
upper plate and folded down over the outer edges of the plate and over the edges of
the aperture in which the machine rests. The several plates are glued together, the
under surface of the upper plate resting on the lead sheathed surface of the under
plate. As glue will not hold well to metal, and as the tighter the plates are pressed
together (the slightest intervening film of air being made apparent by the increase of
sound) the less will be the sonorous quality of the table-top, the plates are also rivetted
together by brass tubes D which to exclude air and prevent sound-conducting contact
between the rivets and the wood, are sheathed in lead. The edges of the lead
sheathing covering the edges of the upper wooden plate (which is slightly smaller
than the lower one) are soldered to the sheet of lead intervening between the two
wooden plates, so that the upper plate C is hermetically sheathed or encased in lead,
and as the machine rests on this lead encased plate the transmission of the sound-
waves to the under plate is greatly or altogether impeded the lead absorbing them in
the same way that dark colors absorb light-rays. The lead-encased upper plate C is
surrounded and protected by a beading or frame, as shewn.
It has been remarked that the absence of sonority is principally due to the inter-
vention of the non-conducting material between the two plates which intercepts the
sound-waves to a very considerable extent. Now, if the upper surface and edges be
uncovered the effect is but little inferior to that of the metal plate described in a
previous application for Letters Patent filed by me, and therefore fulfils the required
conditions of non-sonority and it is much cheaper to make.
Instead of the wire-gauze drawer hitherto employed, a similar one of wood is used,
the bottom of which consists of sheet metal strips fixed to the frame of the box and
covered with oil-cloth. This box is likewise noiseless.

page_text: Having now particularly described and ascertained the nature of the said invention
and in what manner the same is to be performed, I declare that what I claim is-
1. The construction of a sewing machine table top of wood encased on all sides
with sheet lead, substantially in the manner and for the purpose as described and
shown.
2. The construction of a sewing machine table top of one or more plates of wood,
the upper one, when more than one is employed, being wholly sheathed in lead as
nearly as possible hermetically, the plates of wood and lead being glued or cemented
together, substantially as herein specified.