Improvements in Clutches for Conveying Rotary Motion.
Year: 1894

page_text: Date of Application, 24th Feb., 1894-Accepted, 31st Mar., 1894
COMPLETE SPECIFICATION.
Improvements in Clutches for Conveying Rotary Motion.
We, FRANZ DZIECH, and GUSTAV SEIDEL, both Machine Manufacturers of
Brasso, in the Kingdom of Hungary, 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:-
The present invention relates to engaging and disengaging gear and consists of
a clutch device, for coupling and uncoupling sheave pulleys, gear wheels fly wheels
and the like to the driving shaft.
In carrying out the invention we provide a sleeve keyed to the driving shaft
and on which the fly wheel pulley or gear wheel runs loosely. The said sleeve
carries a clutch device alapted to grip a lateral rim on the said pulley, fly wheel
or the like, and thus couple the same to the driving shaft. The gripping device
consists of two grippers arranged to slide in parallel guides on each side of the
shaft, said guides being carried by the fast sleeve previously mentioned and the
two gripping blocks forming each gripper are drawn together to grip the lateral
rim of the said pulley by means of screw spindles having their threads cut in the
opposite direction to each other, so that by turning the said spindles from a hand
lever the grippers may be caused to clamp the rim and thus couple the pulley, fly
wheel or gear of any kind to the shaft.
And in order to make the present Specification more easily intelligible reference
is had to the accompanying drawings in which similar letters denote similar parts
throughout the several views
Fig. 1 being a vertical section through the device;
Fig. 2 a section on line - in Fig. 1;
Fig. 3 a plan of Fig. 1 showing the gear coupled and Fig. 4 a similar plan
showing the position of the parts when uncoupled.
To the driving shaft is keyed the sleeve f, carrying the parallel guide arms e e
for the gripper blocks c c. On the said sleeve runs loosely the pulley, gear, or
fly wheel a, having a laterally extending rim b. The gripper blocks cc which are
arranged in pairs at diametrically opposite sides of the driving shaft are operated
to close and open on to the rim 6 by means of the toggle levers g i, from the hand
lever j. The two members of each pair of gripper blocks are connected together
by a screw spindle d having right and left hand threads of a somewhat wide pitch
and to the said spindle between the said grippers is rigidly attached the end of the
arm g of the toggle levers. The members ii of the said toggle levers are pivoted
to the support which runs loosely on the driving shaft and is provided with a
circular groove for the reception of the forked part of the lever j.
The device operates in the following manner :-
On shifting the lever to the right in Fig. 1 the members g g of the toggle
levers will be pushed into the position shown in Fig. 4 thereby rotating the screw
spindles d d and releasing the gripper blocks from the lateral rim b by forcing
them apart, and allowing the pulley, fly wheel, gear or the like, to stop; on shifting
the lever j in the opposite direction, the gripper blocks will be drawn together and
tightened on to the rim 6 thus coupling the said wheel a to the sleeve f and causing
the same to revolve with the driving shaft.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is performed, we declare that what we
claim is :-
In a coupling device, the combination of a sleeve keyed to the driving shaft and

page_text: pulley, fly wheel or gear adapted to run loosely on said sleeve, guides attached to
the said sleeve, and gripper blocks to slide in said guides, screw spindles having
reverse threads. to connect up each pair of grippers, toggle levers operated from a
hand lever or its equivalent by means of a support k, to turn said screw spindles and
cause the gripper blocks to close on to or withdraw from a rim on the wheel to be 5
coupled, substantially as and for purpose specified..
Dated this 23rd day of February 1894.
CASTLE SMITH,
"Invention " Office, 54, Fleet Street, London, E.C.,
Agent for the Applicants.
CASTLE SMITH,
"Invention " Office, 54, Fleet Street, London, E.C.,
Agent for the Applicants.