AN IMPROVED PULLEY BLOCK
Year: 1878

page_text: LETTERS PATENT to William Robert Lake, of the Firm of Haseltine, Lake, &
Co., Patent Agents, Southampton Buildings, London, for the Invention of
"AN IMPROVED PULLEY BLOCK." A communication from abroad by John
Lang Pope, of Cleveland, Ohio, United States of America.
aled the 18th February 1879, and dated the 12th September 1
PROVISIONAL SPECIFICATION left by the said William Robert Lake at the
Office of the Commissioners of Patents on the 12th September 1878.
"
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. AN IMPROVED PULLEY BLOCK." [A commu-
nication from abroad by John Lang Pope, of Cleveland, Ohio, United States of
America.]
.
This Invention relates to an improved pulley block, which is so constructed as to
ensure very great strength and durability combined with lightness, thereby
rendering the same much more advantageous in use than blocks as heretofore
manufactured.
In carrying the said Invention into practice I construct a metallic shell of light
thin metal, preferably malleable iron, which shell forms the outside surface of the
pulley block, and within this shell I place wood, vulcanized fibre, or similar com-
paratively light material, which forms a filling or inner body conforming to the
internal configuration of the said shell, so that the filling and the shell become as it
were one solid block, the filling supporting the thin metal of the shell and the latter
effectually preventing the wood or other material used as the body or filling from
becoming injured. I am thus enabled to provide a broad and smooth surface to
the entire exposed portion of the block without the heavy weight and other dis-
advantages which have always accompanied metal blocks, and I also ensure great
durability which has always been wanting in wooden blocks.
.
If wood be used for the filling I prefer to employ either pine or other wood,

page_text: which has been antiseptically treated to make it impervious to moisture and to
resist decay or contraction arising from the same or from dryness.
I am aware that metallic bands have been shrunk upon the peripheral portions
of the wooden cheeks of a pulley block; but such construction does not protect the
end portions of the cheeks as the shell does. The latter embraces the exposed
portions of the periphery and the end portion of the cheeks.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Robert Lake in the Great Seal Patent Office on the 12th
March 1879.
r
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "AN IMPROVED PULLEY BLOCK." A. commu-
nication from abroad by John Lang Pope, of Cleveland, Ohio, United States of
America.
This Invention relates to an improved pulley block, which is so constructed as to
ensure very great strength and durability combined with lightness, thereby
rendering the same much more advantageous in use than pulley blocks as heretofore
manufactured.
In carrying the said Invention into practice I construct a metallic shell of light
thin metal, preferably malleable iron, which shell forms the outside surface of the
pulley block, and within this shell I place wood, vulcanized fibre, or similar com-
paratively light material, which forms a filling or inner body conforming to the
internal configuration of the said shell, so that the filling and the shell become as
it were one solid block, the filling supporting the thin metal of the shell, and the
latter effectually preventing injury to the wood or other material used as the body
or filling.
In the accompanying Drawing,
Figure 1 is a side elevation of a pulley block constructed according to this
Invention Figure 2, a front elevation; and Figure 3, a transverse section of the
same.
Figure 4 is an interior view of one side of the said metallic shell.
A is the shell; A¹, A¹, are the cheeks; A² is the bridge; B is the hook joined to
the shell A in any suitable manner; C, C, are the sheaves revolving upon a suitable
shaft C'; D represents wood, vulcanized fibre, or the like, which, as shown in the
Drawing, is made to fill the shell A. The provision of this filling D enables me to
construct the shell A of light thin metal, preferably of malleable iron, although
other suitable metal may be used. Without the filling D such light construction
of the shell would be impracticable, as it would be liable to bending and breaking.
But by reason of the filling D I insure great strength and lightness, and am able
to provide a broad and smooth surface to the entire exposed portion of the block
without the disadvantages which have always heretofore accompanied these
desirable characteristics.
c..

page_text: I prefer, if wood is employed for the filling D, that it should be either pine or
other wood antiseptically treated to render it impervious to moisture, and not liable
to decay or contraction or other injury by the effect or influence of the weather or
atmosphere. E is the becket staple for the reception of the ordinary becket
thimble.
Having thus fully described the said Invention as communicated to me by my
foreign correspondent, and the manner of performing the same, I wish it under-
stood that I am aware of metallic bands having been heretofore shrunk upon the
peripheral portions of the wooden cheeks of a pulley block; but such construction
does not protect the end portions of the cheeks so efficiently as the shell, which
extends over the exposed portions of the periphery and the end portion of the said
cheeks, and I claim a pulley block formed with an external metallic shell and an
internal filling of wood, vulcanized fibre, or similar light substance, as shewn in the
accompanying Drawing, and as above described for the purposes specified.
In witness whereof, I, the said William Robert Lake, have hereunto set my
hand and seal, this Twelfth day of March, in the year of our Lord One
thousand eight hundred and seventy-nine.