An Improved Ratchet and Pawl Device.
Year: 1893

page_text: Date of Application. 14th Sept., 1893
Complete Specification Left, 13th June, 1894-Accepted, 14th July, 1894
PROVISIONAL SPECIFICATION.
An Improved Ratchet and Pawl Device.
I, RICHARD SHULTZ, of No. 23, Petzschauerstrasse, Leipzig-Eutritzsch,
Saxony, in the German Empire, Foreman, do hereby declare the nature of this
invention to be as follows:-
This invention relates to an improved catch, or ratchet and pawl device, the
distinguishing feature of which is its noiseless operation, due to the peculiar
manner in which motion is imparted to the pawl; and constituting an important
advantage over any similar devices hitherto employed.
The construction and operation of the device are as follows;-
Upon a spindle are firmly secured a ratchet wheel and a pinion which, through
the medium of a wheel, acts upon a spring barrel, cord-pulley, or drum, howsoever
weighted or operated. A pawl is adapted to move into, and out of engagement
with the ratchet wheel and, when so engaged, is retained in place by the said
ratchet wheel against the action of the barrel or drum, whatever the power by
which the latter is actuated.
The pawl is connected to a lever by a pin adapted to slide in a slot which is
provided for the purpose in the said lever, and, in doing so, (owing to the shape of
the slot) to move the pawl into, or out of, engagement with the ratchet wheel. The
lever is adapted to perform a certain movement in conjunction with the ratchet
wheel, when it is pressed against such wheel by yielding pressure produced in any
suitable manner, say by means of spring plates. When the spindle is so turned as
to move the ratchet wheel forward, overcoming the resistance of the spring barrel
(or the like), the pawl is released from the ratchet wheel, and the lever, following
the movement of the ratchet wheel, raises the pawl by the combined action of the slot
and pin, so that it slips out from between the teeth of the ratchet wheel in a
perfectly noiseless manner; and similarly, when the ratchet wheel is stopped from
further advancing and allowed to yield to the antagonistic action of the barrel, the
pawl will noiselessly move back into engagement, under the action of the spring
lever, participating in the backward motion of the ratchet wheel; and the latter
will accordingly be locked against further backward rotation.
The same effect may be produced, if desired, without the provision of a slot, the
release of the pawl taking place by its being caused to slide along the back of the
teeth of the ratchet wheel, the lever being prevented from advancing too far by
the stop pin; while, as the said lever moves backward, along with the ratchet
wheel and its surface meets the pin, it again causes the pawl to move into
engagement with the said wheel.
Dated this 13th day of September 1893.
FAIRFAX & WETTER,
433, Strand, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Ratchet and Pawl Device.
I, RICHARD SCHULTZ, of No. 23, Petzschauerstrasse, Leipzig-Eutritzsch,
Saxony, in the German Empire, Foreman, do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
This invention relates to an improved catch, or ratchet and pawl device, the

page_text: operation
ШАЦИС
in which motion is imparted to the pawl; and constituting an important advantage
over any similar devices hitherto employed.
In the accompanying drawings;
Fig. 1 is a front elevation of a ratchet and pawl mechanism embodying my
invention, the pawl being shown out of gear.
Fig. 2 is the same, with the pawl in gear,
Fig. 3 is a side elevation of the device,
Fig. 4 a plan;
Figs. 5 and 6 represent a modification
Figs. 6 to 9 another modification.
The construction and operation of the device are as follows;—
Upon a spindle a are firmly secured a ratchet wheel A and a pinion B, which,
through the medium of a wheel, D acts upon a spring-barrel, cord pulley, or
drum E, howsoever weighted or operated. A pawl K is adapted to move into, and
out of engagement with the ratchet wheel A and, when so engaged, retains the said
ratchet wheel in place against the action of the barrel or drum E.
The pawl K is connected to a lever F by a pin adapted to slide in a slot d
which is provided for the purpose in the said lever, and, in doing so, (owing to the
shape of the slot) to move the pawl into, or out of, engagement with the ratchet
wheel. The lever F is adapted to perform a certain movement in conjunction with
the ratchet wheel, when it is pressed against such wheel by elastic pressure
produced in any suitable manner, say by means of spring plates e. When the
spindle a is so turned, as to move the ratchet wheel A forward, overcoming the
resistance of the spring barrel (or the like), the pawl is released from the ratchet
wheel, and the lever F following the movement of the ratchet wheel A, raises the
pawl by the combined action of the slot d and pin b, so that it slips out from
between the teeth of the ratchet wheel in a noiseless manner (Fig. 1) and similarly,
when the ratchet wheel is stopped from further advancing and allowed to yield to
the antagonistic action of the barrel, the pawl will noiselessly move back into
engagement, under the action of the spring lever F participating in the backward
motion of the ratchet wheel A, and the latter will accordingly be locked against
further backward rotation.
As shown by Figs. 5 and 6, the same effect may be produced, without the
provision of a slot, d, the release of the pawl K taking place by its being caused to
slide along the back of the teeth of the ratchet wheel, Fig. 5, the lever F being
prevented from advancing too far by the stop pin f; while, as the said lever moves
backward along with the ratchet wheel A, and its face 9 meets the pin b, it again
causes the pawl to move into engagement with the said wheel.
•
The same object is attained by the arrangements represented by Figs. 7 to 9.
In this case the lever is formed by a spring G, one end of which has the shape
of an arm provided with an eyelet or loop h adapted to act on the pin b.
The spring G may be coiled helically around the axle a and pressed against the
face of the wheel A by a disc i, as illustrated by Figs. 7 and 8, or it may be held
to the axle a by, friction, as represented by Fig. 9, in which case it surrounds the
axle like a brake band or clamp.
The action of the spring lever G on the pawl K through the pin b, owing to its
being pressed against the wheel or against the axle, is the same as has been
explained with reference to Figs. 1 to 3.
The improvements described above may be applied to ordinary ratchet and pawl
mechanism.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. A ratchet and pawl mechanism comprising in its construction a lever F kept
10 contact with the ratchet whool be onzing
and edented to
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the

page_text: pawl K in and out of gear, by means of slot d and pin 6 when following the
motion of the ratchet wheel, or to produce a similar result by the co-operation of
the pin 6 with the face 9 of the lever F and a stop pin f, substantially as described
and illustrated.
2. A ratchet and pawl mechanism of the type specified above, with the modifi-
cation, that the pawl K is actuated by a spring & serving as a lever, for which
purpose the spring G forms an eyelet or loop h and is either coiled on the axle or
mounted like a brake band, so as to receive motion either from the wheel A or
from the axle a, substantially as described and illustrated.
Dated this 12th day of June 1894.
FAIRFAX & WETTER,
433, Strand, London, Agents.