A Novel or Improved Friction Clutch.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
A Novel or Improved Friction Clutch.
We, JUSTUS MAGNUS RINGQUIST and HENRY CLARK, Draughtsmen, and the
firm of HEAD WRIGHTSON AND COMPANY, LIMITED, Engineers, all of the Teesdale
Iron Works, Thornaby-on-Tees, in the County of York, do hereby declare the
nature of this invention to be as follows:-
This Invention relates to a friction clutch and consists in improved mechanism
for applying the requisite friction more easily than in clutches of this kind as at
present constructed and is more especially an improvement on the cone clutch in
which great leverage is required to maintain the requisite frictional contact between
the plug and the recess.
In a clutch constructed in accordance with this invention two clamping blocks
are forced outwards against the internal surface of the rim of the pulley or belt
wheel running on the driving shaft the said clamping blocks being extended
outwards by toggle levers as the clutch is applied. These toggle levers are pivotally
attached at their inner ends to the usual clutch block or hub which slides on the
driving shaft and is provided with a clutch lever in the usual manner. The outer
ends of the toggle levers are pivotally attached to the clamping blocks which
are guided in their true position by guide bars. When the clutch is applied the
toggle arms of course approach a straight line thus applying in this position
the requisite intense pressure with comparatively little effort on the part of the
operating leverage. The toggle arms are adjustably pivotted for wear by suitable
means such as by an eccentric pin or bolt the eccentricity of which is applied more
and more from time to time as required, and is retained in each required position
by what may be termed a keep plate.
G. J. CLARKSON,
Chartered Patent Agent,
Stockton-on-Tees, Agent for the Applicants.
A Novel or Improved Friction Clutch.
We, JUSTUS MAGNUS RINGQUIST HENRY CLARK, Draughtsmen, and
firm of HEAD WRIGHTSON AND COMPANY, LIMITED, Engineers, all of the Teesdale
Iron Works, Thornaby-on-Tees, in the County of York, 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 a friction clutch and consists in improved mechanism

page_text: for applying the requisite friction more easily than in clutches of this kind as at
present constructed and is more especially an improvement on the cone clutch in
which great leverage is required to maintain the requisite frictional contact
between the plug and the recess whereas by this invention the leverage required
in this respect is easily applied and maintained.
And in order that our invention may be clearly understood and readily carried
into effect we will now proceed to describe the same with reference to the accom-
panying drawing.
Fig. 1 is an end elevation of the improved friction clutch constructed in accor-
dance with our invention.
Fig. 2 is a transverse sectional view taken on line of Fig. 1.
In a clutch constructed in accordance with this invention two clamping
blocks a a are forced outwards against the internal surface of the rim 6 of the
clutch casing which runs loose on the driving shaft c the said clamping blocks
being extended outwards by toggle levers d as the clutch is applied. These
toggle levers are pivotally attached at their inner ends to the usual sleeve e which
slides on keys on the driving shaft c and is provided with a clutch lever in the usual
manner (not shewn in the drawing) but working in the recess el formed by the
collar e. The outer end of the toggle levers are pivotally attached to the clamping
blocks al a which are guided in their true position by guide bars f. As the clutch
is applied the toggle arms approach a straight line thus giving the requisite
pressure with comparatively little pressure on the striking levers. The toggle
arms are adjustably pivotted for wear by suitable means such as by an
eccentric pin or bolt g the eccentricity of which is applied more and more from.
time to time as required, and is kept in each required position by what may be
termed a keep plate h.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is
-
1. Friction clutches in which the mechanism for applying the friction consists
of shoes such as a forced outwards against the rim of the clutch by means of
toggle armis pivotally attached to them and to a sleeve provision being made for
accurate adjustment of the said toggle arms by means of an eccentric pin adapted
to be set in any required position all combined, arranged and operating together
substantially as hereinbefore described with reference to the accompanying
drawing.
2. An improved friction clutch provided with a combination of parts to operate
together substantially as and for the purpose herein before described.
Dated this 19th day of June 1897
G. J. CLARKSON,
Chartered Patent Agent,
Stockton-on-Tees and Hull, Agent for the Applicants.
G. J. CLARKSON,
Chartered Patent Agent,
Stockton-on-Tees and Hull, Agent for the Applicants.