IMPROVEMENTS IN APPARATUS FOR CONVERTING VIBRATING OR RECIPROCATING MOTION INTO ROTARY MOTION
Year: 1883

page_text: LETTERS PATENT to Alexander Melville Clark of the firm of A. M and
W Clark of 53 Chancery Lane in the County of Middlesex Fellow of the
Institute of Patent Agents for an Invention of IMPROVEMENTS IN APPARATUS
FOR CONVERTING VIBRATING OR RECIPROCATING MOTION INTO ROTARY MOTION
communicated to him from abroad by Arthur Wellington Bush and Charles
Robert Roberts both of Boulder in the County of Boulder and State of
Colorado, United States of America
PROVISIONAL SPECIFICATION left by the said Alexander Melville Clark
at the Office of the Commissioners of Patents on the 27th September 1883.
ALEXANDER MELVILLE CLARK, of the firm of A. M. and W. Clark of 53 Chancery
Lane, in the County of Middlesex, Fellow of the Institute of Patent Agents,
"IMPROVEMENTS IN APPARATUS FOR CONVERTING VIBRATING OR RECIPROCATING
MOTION INTO ROTARY MOTION." [communicated to him from abroad by Arthur
Wellington Bush and Charles Robert Roberts both of Boulder in the County of
Boulder and State of Colorado, United States of America]
This Invention relates to means for converting treadle or other vibratory or
reciprocating motion into rotary motion and the Invention consists of a branching
or double connecting rod provided with a spring and a pair of reversely acting
pawl arms in combination with the internal surface of a wheel rim so arranged
that one pawl is made to go backward with relation to the rim of the wheel to the
point of its re-engagement while the other pawl is driving forward to its point of
release and each pawl begins to drive when the other releases, so that the dead
centres of the crank are avoided, and the stroke of the treadle may be varied at
the will of the operator.
I may use either a branched connecting rod jointed together, or two rods,
connecting the same to the treadle at the extreme end, and I connect each rod or
branch to a separate pawl arm, swinging from a shaft, on which the wheel having
a rim either plain or toothed is mounted. The pawl arms are furnished with
click pawls which act on the inside of the rim of the wheel.

page_text: The Spring is arranged between the two parts of the connecting rod to ensure
the reverse action of the pawl arms with relation to the wheel rim, when the
connecting rod reverses at the extreme of the down stroke, in case the treadle be
worked to its full range, so that when both of the click pawls set to turn in the
same direction, I have a connecting rod for a treadle that drives in both directions
alike, and changes the stroke at any length desired. To cause the bite of the
click pawls on the forward stroke and the release on the back stroke I use friction
arms which grip the shaft with the requisite pressure by spring arms and a
tightening screw and which have a little forward and backward play with relation
to the pawl arms limited by stud pins, which are permanently fixed in the pawl
arms, and project into holes, on the friction arms of suitable size to allow the
requisite play of said friction arms. Said arms are connected with the click pawls
by a slot in the end and a stud pin in the pawls, so that when the pawl arms go
back on the shaft the friction arms will fall behind by their friction on the shaft
and swing and hold the click pawls out of the teeth or off from the surface of the
rim of the wheel, and when the pawl arms reverse the resistance of the friction
arms will instantly throw the pawls out and cause them to engage the rim. This
will prevent the pawls from making a ratling noise when the rim is toothed and
will materially lessen the wear of the pawls on the rim that occurs when springs
are used.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Alexander Melville Clark in the Patent Office on the 12th March
1884.
ALEXANDER MELVILLE CLARK of the firm of A. M. and W. Clark of 53 Chancery
Lane in the County of Middlesex Fellow of the Institute of Patent Agents.
"IMPROVEMENTS IN APPARATUS FOR CONVERTING VIBRATING OR RECIPROCATING
MOTION INTO ROTARY MOTION. "
A communication to me from abroad by Arthur
Wellington Bush and Charles Robert Roberts, both of Boulder in the County of
Boulder and State of Colorado United States of America.
This Invention consists of a branching or double connecting rod and a pair of
reversely acting pawl arms in combination with the internal surface of a wheel
rim either plain or toothed, whereby with a spring between the two parts of the
connecting rod one pawl is made to go backward with relation to the rim of the
wheel to the point of its re-engagement while the other pawl is driving forward to
its point of release and so that each pawl begins to drive when the other releases,
so that the dead centres of the crank are avoided and the stroke of the treadle
may be varied at the will of the operator, all as hereinafter described and claimed.
Reference is to be had to the accompanying drawings forming part of this
specification, in which similar letters of reference indicate corresponding parts in
all the figures.
Figure 1 is a side elevation of the improved gear for connecting treadle or other
vibrating or reciprocating motion into rotary motion, the pawls being in the
extreme position of a stroke of the treadle or connecting rod. Figure 2 is a side
elevation of the same gear representing the connecting rod approaching the extreme
opposite point of figure 1. Figure 3 is a section of figure 2, on the line
Figure 4 is a detail of one of the friction arms
and
I use either a branched connecting rod a b jointed together at o or a double rod,
or two rods, connecting the same to the treadle at d for being operated by said
treadle, and connect each rod or branch to a separate pawl arm e or f, swinging
from the shaft on which is a wheel having a rim h upon the inside of which the
said pawl arms act by click pawls i and between the two branches, or parts of the
connecting rod I arrange a spring; that ensures the reverse action of the pawl
arms with relation to the wheel rim, when the connecting rod reverses at the
extreme of the down stroke, in case the treadle be worked to the extreme of its
range, so that when both of the click pawls are set to turn in the same direction, I
have a connecting rod for a treadle that drives in both directions alike, and changes
the stroke at any length desired. For causing the bite of the click pawls on the
forward stroke and the release on the back stroke I use friction arms k made to
grip the shaft g with the requisite pressure by spring arms and a tightening
screw m which have a little forward and backward play with relation to the pawl
arms ef limited by the stud pins n which are permanently fixed in the pawl arms,
but project into holes o on the friction arms of suitable size to allow the requisite
play of said friction arms and said arms are connected with the click pawls by &
slot p in the end and a stud pin q in the pawls so that when the pawl arms go
back on the shaft the friction arms will fall behind by their friction on the shaft
and swing and hold the click pawls out of the teeth or off from the surface of the
rim h and when the pawl arms reverse the resistance of the friction arms will
instantly throw the pawls out and cause them to engage the rim. This contrivance
will prevent the pawls from making a rattling noise when the rim h is toothed and
it will materially lessen the wear of the pawls on the rim that occurs when springs
are used.

page_text: Having described the nature of the said Invention and the manner of performing
the same I declare that what I claim as the Invention to be protected by the
hereinbefore in part recited Letters Patent is
1. The combination with a wheel rim, its shaft and reversely working pawl
arms ef provided with pawls i of a double or two part treadle connecting rod ab
and spring arranged between the branches or parts of said connecting rod,
substantially as herein shown and described.
+
".
2nd The combination of friction arms k with the shaft g pawl arms; and click
pawls, substantially as described.
3rd The friction arms k in combination with the pawl arms and click pawls and
being connected with the pawl arms, with limited lateral play, and connected with
the pawls suitably for swinging them, by the said lateral play with relation to said
pawl arms, substantially as described.
In witness whereof I the said Alexander Melville Clark, have hereunto set my
hand and
seal this Tenth day of March A.D. 1884,
50
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