Improvements in Friction-clutches.
Year: 1899

page_text: Commit
Date of Application, 29th Sept., 1899
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4000
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44th And
1000
Improvements in Friction-clutches.
I, WILLIAM ROGER DAWE, of 82, Andover Street, City of Sheffield, Manager
of Steel Works, do hereby declare the nature of my invention to be as follows:-
My invention relates to improvements in the construction of friction-clutches,
such as are used to transmit motion from one portion of machinery to another.
In carrying out my invention in constructing a clutch to transmit the rotary
motion of one shaft to another in line with it, and the ends of which abut or
nearly so, for example; I fix securely upon the end of one shaft a recessed
disc, that is a disc with its periphery overhanging the end of the adjacent shaft.
Upon the end of this adjacent shaft are one or more fixed keys or "feathers,"
and upon the feathers are two bosses; the end boss is fixed permanently, and
the other is capable of being moved longitudinally upon the feathers by means
of a lever or like device, towards or from the end boss which is close to the face
of the disc.
Each boss is provided with pinjointed radial arms pivotally connected at their
outer ends to clutch blocks or slioes which are shaped to fit against the inside face
of the periphery or rim of the disc. For example a clutch of medium size
would have four equidistant sets of arms radiating from each boss, the corres-
ponding sets from each bess having a shoe connected pivotally to their outer ends.
The shoes may vary in configuration, and they may have removable faces, or
faces which can be adjusted as they become worn by the frictional contact of
the disc when they are thrown into gear.
Each double set of arms when connected with a shoe, constitute what is tech-
nically called a togglejoint, so that when the sliding boss is caused to move
upon the feathers nearer to the fixed boss, the arms assume a more upright or
straighter angle and cause the shoes to grip the disc by frictional contact against
inside of the rim, and vice versa.
To counteract any tendency to torsional twist of the arms which form the
toggle-joint before described, the shoes are supported by a ring which is carried
by arms extending from the sliding boss.
Dated the 28th day of Sentember 1899
ROBT. F. DRURY, C.P.A.,
Agent for Applicant,
Bank Buildings, George Street, Sheffield.
COMPLETE SPECIFICATION.
Improvements in Friction-clutches.
I, WILLIAM ROGER DAWE, of 82, Andover Street, City of Sheffield, Manager
of Steel Works, 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:-
My invention relates to improvements in the construction of friction-clutches,

page_text: such as are used to transmit motion from one portion of shafting or machinery to
another.
A clutch made according to my invention is illustrated in the annexed sheets
of drawings in which
Fig. 1, is an elevation showing a portion in section.
Fig. 2, is a section of same through line 1, 1.
Fig. 3, is a section of same through line 2, 2, showing levers and shoc removed.
Fig. 4, two views of the centre radial arm.
Fig. 5, two views of outside radial arms.
Fig. 6, two views of a shoe.
In carrying out my invention in constructing a clutch for the transmission of
rotary motion from one shaft to another shaft in line with it, as shown in the
drawings, the ends of the shafts being closely adjacent, for example, I fix
securely upon the end of one of the said shafts marked S¹, a recessed disc D,
its flanged periphery P, projecting beyond the end of the adjacent shaft S2.
Upon the extreme end of the shaft S, is securely fixed a boss B', carrying a
series of pivotally connected radial arms A¹, arranged in pairs, four pairs being
used in the clutch shown.
Another boss 12 of larger diameter to fit within the flanged periphery of the
disc 1), and sliding upon fixed keys K also carries a set of four radial arms
(pivotally connected) which engage between the pairs of arms A¹, and are all
connected at their outer ends with shoes or clutch blocks C, which are shaped to
fit against the inside face of the flanged periphery of the disc D.
I prefer to provide the shoes or clutch blocks C with removable facings F,
shown in Figs. 1 & 6 preferably of copper or the like, for renewal in case of wear
by frictional contact with the disc 1).
The said shoes slide radially in recesses R, in the large boss B2, moving
towards or from the inside face of periphery of the disc, and this movement
is caused by the alteration of the angle of the connected radial arms A1 and A2,
when the sliding boss B2 is moved nearer to or further from the fixed
boss B¹, by the clutch lever or other means not shown in the drawings.
The arrangement of the radial arms which as described are pinjointed together
and to the shoes at their outer ends, while those marked A' are pivotally connected
at their lower or inside end to the fixed boss B¹, and the arms A3, are similarly
secured to the sliding boss B, form a toggle joint enabling a frictional grip of
great power to be obtained, and also one that can be instantly released.
As the shoes slide in recesses they are thereby supported on each side to
resist torsional action, and to avoid strain upon the radial arms.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
1-A friction clutch having its essential parts constructed and arranged as
herein before described and shown.
2-In a friction clutch, the combination with a flanged disc 1), of a fixed
boss B, and a sliding boss 132, sets of radial arms A1 and A2 pivotally connected
with shoes or clutch blocks C, and with the said bosses, the said shoes capable
of engaging with the flange of the disc D, constructed and operating as herein-
before described and shown.
Dated the 60th
T
1000
ROBT. F. DRURY, C.P.A.,
Applicants Agent.