IMPROVEMENTS IN FAST AND LOOSE PULLEYS FOR DRIVING MACHINERY
Year: 1876

page_text: LETTERS PATENT to John Garrett Tongue, of the Firm of Tongue aud Birkbeck,
Patent Agents and Engineers, of 34, Southampton Buildings, Chancery Lanc,
in the County of Middlesex, for the Invention of "IMPROVEMENTS IN FAST
AND LOOSE PULLEYS FOR DRIVING MACHINERY." A communication from
abroad by Alexander Montgomery, of New York, United States of America.
PROVISIONAL SPECIFICATION left by the said John Garrett Tongue at the
Office of the Commissioners of Patents on the 29th December 1876.
JOHN GARRETT TONGUE, of the Firm of Tongue and Birkbeck, Patent Agents
and Engineers, of 34, Southampton Buildings, Chancery Lanc, in the County of
Middlesex. "IMPROVEMENTS IN FAST AND LOOSE PULLEYS FOR DRIVING MACHINERY."
A communication from abroad by Alexander Montgomery, of New York, United
States of America.
This Invention has for its object improvements in fast and loose pulleys for
driving machinery, whereby the driving band or bolt can be more readily shifted
from one pulley.to the other.
For this purpose in carrying out these improvements the loose pulley is made
about two inches in diameter, more or less, smaller than the fast pulley, and is
made with a conical flange for the belt to run upon from the loose to the fast
pulley, thus greatly facilitating the transfer of the belt from one pulley to the other,
and reducing the risk of accident to the workman in doing so.
The conical flange may either be upon the fast or the loose pulley, or it may be
a separate pulley running between the two.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Garrett Tongue in the Great Seal Patent Office on the 29th June
1877.
JOHN GARRETT TONGUE, of the Firm of Tongue and Birkbeck, Patent Agents and
Engineers, of 34, Southampton Buildings, Chancery Lane, in the County of Middle-
[Price Adl

page_text: sex. "IMPROVEMENTS IN FAST AND LOOSE PULLEYS FOR DRIVING MACHINERY."
A communication from abroad by Alexander Montgomery, of New York, United
States of America.
This Invention has for its object improvements in fast and loose pulleys for
driving machinery, whereby the driving band or belt can be more readily shifted
from one pulley to the other.
And in order that the Invention may be clearly understood and readily carried
into practice I will proceed to describe the same with reference to the Drawing
hereto annexed, in which Figure 1 shows a driving pulley constructed in accordance
with this Invention; Figures 2, 3, and 4 are part sections of pulleys of similar con-
struction.
In carrying out these improvements the loose pulley a is advantageously made
about two inches in diameter smaller, or thereabouts, than the fast pulley b, and is
made with a conical or bevilled flange c for the belt to run upon from the loose to
the fast pulley, thus greatly facilitating the transfer of the belt from one pulley to
the other, and reducing the risk of accident to the workman in doing so.
The conical flange may either be upon the fast or the loose pulley, or it may be a
separate pulley or ring running between the two.
In Figures 1 and 2 the bevilled flange c is attached to or forms part of the loose
pulley a; in Figure 4 the flange c is attached to the driving pulley 6; and in
Figure 3 a separate ring with a conical or inclined flange c is arranged to run
between the fast and loose pulley.
Having thus described the nature of the Invention and the manner of performing
or carrying the same into practice, what I claim under the above in part recited
Letters Patent is, the improved arrangement, construction, and combination of fast
and loose pulleys for driving machinery, substantially as and for the purpose herein-
before described and represented in the Drawing hereunto annexed.
In witness whereof, I, the said John Garrett Tongue, have hereunto set my
hand and seal, this Twenty-ninth day of June, in the year of our Lord One
thousand eight hundred and seventy-seven.