IMPROVEMENTS IN BUSHES FOR WOODEN BLOCK SHEAVES OR PULLEYS."
Year: 1881

page_text: LETTERS PATENT to John Gordon, junior, of Dundee, in the County of
Forfar, North Britain, for an Invention of "IMPROVEMENTS IN BUSHES
FOR WOODEN BLOCK SHEAVES OR PULLEYS."
PROVISIONAL SPECIFICATION left by the said John Gordon at the Office
of the Commissioners of Patents on the 25th February 1881.
JOHN GORDON, junior, of Dundee, in the County of Forfar, North Britain.
"IMPROVEMENTS IN BUSHES FOR WOODEN BLOCK SHEAVES OR PULLEYS."
This Invention has for its object to simplify and improve the construction of
wooden block sheaves or pulleys, and in carrying out the Invention what is known
as "metaline" or a similar anti-frictional substance is employed such anti-frictional
substance being in the form of cylindrical plugs held in holes which they exactly
fit and which are formed in metal bushes. Each metal bush is made in an
undivided form and consists of a cylindrical part and of a flange, by which latter
part it is screwed or fixed to the sheave or pulley. The holes for the anti-frictional
substance are drilled through the cylindrical part from the outside towards the
axis, and after the anti-frictional plugs have been placed in the holes a tightly
fitting ring or short tube, which may be quite thin, is forced externally over the
cylindrical part of the bush and prevents the displacement of the plugs.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Gordon in the Great Seal Patent Office on the 24th August
1881.
JOHN GORDON, junior, of Dundee, in the County of Forfar, North Britain.
"IMPROVEMENTS IN BUSHES FOR WOODEN BLOCK SHEAVES OR PULLEYS."
"
My said Invention has for its object to simplify and improve the construction of
wooden block sheaves or pulleys, and in carrying out my Invention I employ what
is known as "metaline or a similar anti-frictional substance, such anti-frictional
substance being in the form of cylindrical or nearly cylindrical plugs held in holes
which they exactly fit and which are formed in metal bushes.
"
And in order that my said Invention, and the manner of performing the same,
may be properly understood, I hereunto append a Sheet of explanatory Drawings,
to be hereinafter referred to, and representing a bush for a wooden block sheave or
pulley as made with my improvements.
Figure 1 on the Sheet of Drawings is an elevation of the bush as with the
unflanged end in front; Figure 2 is a side elevation, but with one half of a thin
covering tube supposed to be cut away; Figures 3 and 4 are sections as at right
angles to each other. In these Drawings the same reference numerals are used to
mark the same or like parts wherever they are repeated.
Each metal bush is made in an undivided form, and consists of a cylindrical or
short tubular part 5, through which the spindle or pin of the block is to pass, and
of a flange 6, by which the bush is screwed or fixed to the sheave or pulley. The
holes for the anti-frictional substance 7 are drilled through the cylindrical part 5,
from the outside towards the axis, and after the anti-frictional plugs 7 have been
placed in the holes a tightly fitting cyrindrical ring or short tube 8, which may be
quite thin, is forced externally over the cylindrical part 5 of the bush and prevents
displacement of the plugs 7.
Having thus particularly described my said Invention, and the manner of
performing the same, I have to state that I do not restrict myself to the precise
details herein described or delineated, but that what I believe to be novel and
original, and claim as the Invention secured to me by and in terms of the
herein before in part recited Letters Patent, is,-
The making of metal bushes for wooden block sheaves or pulleys with plugs of
metalinė or other analogous anti-frictional substance placed in holes drilled through
the undivided body of the bush and covered by an external tube, substantially as
herein before described.
In witness whereof, I, the said John Gordon, junior, have hereunto set my
hand and seal, this Twenty-second day of August, in the year of our
Lord One thousand eight hundred and eighty-one.