IMPROVEMENTS IN JACKS USED WHEN ROASTING AND BAKING
Year: 1865

page_text: LETTERS PATENT to William Robinson, of No. 52, Watling Street, in
the City of London, for the Invention of "IMPROVEMENTS IN JACKS USED
WHEN ROASTING AND BAKING."
Sealed the 13th October 1865, and dated the 20th April 1865.
PROVISIONAL SPECIFICATION left by the said William Robinson at
the Office of the Commissioners of Patents, with his Petition, on tho
20th April 1865.
I, WILLIAM ROBINSON, of No. 52, Watling Street, in the City of London,
do hereby declare the nature of the said Invention for "IMPROVEMENTS IN
JACKS USED WHEN ROASTING AND BAKING," to be as follows:-
This Invention has for its object improvements in jacks used for roasting
and baking. For these purposes a crank or its equivalent is applied to the
last axis or wheel of an ordinary train used in constructing such jacks. To
this crank or instrument a connecting rod is attached, which at its other end
carries a screw nut, which with the connecting rod is guided by suitable
guides in the to-and-fro motion communicated to the connecting rod. The
screw nut is thus moved to and fro along a screw shaft or axis by which such
shaft or axis receives alternating rotatory motion. To one end of the
screw shaft or axis the ordinary suspending yarns are attached, and to the
other end of the screw shaft or axis the ordinary suspending apparatus for
the meat or other article is attached.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Robinson in the Great Seal Patent Office on the
20th October 1865.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
ROBINSON, of No. 52, Watling Street, in the City of London, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twentieth day of April, in the year of our Lord
One thousand eight hundred and sixty-five, in the twenty-eighth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said William Robinson, Her special licence that I, the said William Robinson,
my executors, administrators, and assigns, or such others as I, the said
William Robinson, my executors, administrators, and assigns, should at any
time agree with, and no others, from time to time and at all times thereafter
during the term therein expressed, should and lawfully might make, use,
exercise, and vend, within the United Kingdom of Great Britain and Ireland,
the Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
JACKS USED WHEN ROASTING AND BAKING," upon the condition (amongst others)
that I, the said William Robinson, my executors or administrators, by an
instrument in writing under my, or their, or one of their hands and seals,
should particularly describe and ascertain the nature of the said Invention,
and in what manner the same was to be performed, and cause the same
to be filed in the Great Scal Patent Office within six calendar months next
and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said William Robinson, do hereby declare
the nature of the said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement thereof, that is to say:-
This Invention has for its object improvements in jacks used when roasting
and baking. For these purposes a crank or its equivalent is applied to the
last axis or wheel of an ordinary train used in constructing such jacks. To
this crank or instrument a connecting rod is attached, which at its other end
carries a screw nut, which with the connecting rod is guided by suitable
guides in the to-and-fro motion communicated to the connecting rod; the
screw nut is thus moved to and fro along a screw shaft or axis, by which
such shaft or axis receives an alternating rotatory motion. To one end of the
screw shaft or axis the ordinary suspending yarns are attached, and to the
other end of the screw shaft or axis the ordinary suspending apparatus for
the meat or other article is attached,

page_text: Figures 1 and 2 show two views of a jack constructed in the manner I
prefer for carrying out my Invention; Figure 3 shows an external view of
the jack complete, but on a smaller scale; Figures a and b show the box H
for carrying the screw nut.
In constructing a 25 lb. jack I use a spring box and spring A half an
inch wide, of the ordinary length, form, and strength; its arbor and
ratchet are of the ordinary construction, and its main wheel differs only in
size and number of teeth from those commonly used. The main wheel B is
24 inches in diameter, and has sixty teeth; it is made to drive a pinion C of
eight teeth, which on its axis carries with it a second spur wheel D 2 inches
in diameter, and having fifty-four teeth. This second spur wheel D is made
to drive a second pinion E of eight teeth carrying a crank F, which may be
of any length of throw found desirable, but I find the most convenient size of
crank is from to of an inch, giving a throw of to 1 inches. From the
crank F motion is by a connecting rod G communicated to a box H so con-
structed as on one side to carry a screw nut, and on the other to slide on a
guide rod J. The screw nut may be of any form, but I find the best to
consist of a piece of sheet metal about 3nds of an inch thick, or thereabouts,
perforated with a hole in form corresponding to the section of the screw K.
The screw K may be of one or more threads, but I find a screw of two threads
having three turns to the inch cut on a charcoal iron or steel wire, No. 8
size, on the wire gauge answers well. The length of the screw is such as to
allow the nut to traverse to the extent of the crank used with an allowance
for the stretching of the silk or other suspending line. Jacks to carry other
weights are to be made in proportion to the construction above particularly
described.
Having thus described the naturo of my Invention, and the manner of
performing the same, I would have it understood that I make no claim to the
mechanical parts separately, but I claim the combined arrangement herein
described.
In witness whereof, I, the said William Robinson, have hereunto set my
hand and seal, this Seventeenth day of October, in the year of our
Lord Ona thousand eight hundred and sisty fine
W. ROBINSON. (L.S.)