A New or Improved Clutch for Driving Hoisting Machinery and for other like Purposes.
Year: 1889

page_text: Date of Application, 5th Sept., 1889
Complete Specification Left, 10th May, 1890-Accepted, 14th June, 1890
PROVISIONAL SPECIFICATION.
A New or Improved Clutch for Driving Hoisting Machinery and for
other like Purposes.
We GEORGE TANGYE of the firm of Tangyes Limited of Cornwall Works Soho in
the County of Stafford Engineers and RICHARD GAY of No. 59 Corbett Street
Smethwick in the County of Stafford Mechanical Engineer do hereby declare the
nature of this Invention to be as follows:-
The said invention consists of a clutch constructed and operating in the manner
hereinafter described. The said clutch is especially applicable to the driving of
hoisting machinery but may also be employed for driving other machinery.
We will describe the said invention in connection with a hoist.
On the side of the hand chain wheel which is not fixed to but turns freely on the
shaft of the hoist an eccentric is fixed the said eccentric being preferably cast in one
piece with the said hand chain wheel. A clip surrounding and turning freely on
the said eccentric carries an arm at the end of which is a swivelling gripping piece
which overhangs a pulley fixed on the shaft. When the chain wheel is operated
upon by means of its chain the eccentric carried by it having performed somewhat
less than a semi-rotation the clip working on the excentric is drawn nearer to the
axis of the shaft and the gripping piece is made to bear upon and grip the fixed
pulley and carry it and its shaft round with the hand chain wheel.
The load raised will remain suspended until the brake of the hoist is released.
The hand chain wheel clip and gripping piece will travel with the fixed pulley until
the gripping piece has reached its lowest point. The fixed pulley will now rotate
without carrying with it the gripping piece and hand chain wheel the weight of the
gripping piece keeping it in its lowest position and out of gear with the fixed pulley
until its position is changed by the motion of the hand chain wheel.
In lowering the load the chain of the hand wheel is paid out with slight resistance
and the descent of the load is under the complete control of the operator.
Generally the hand chain wheel will not be carried more than one half of a rotation
before it is wholly freed from the shaft and fixed pulley.
The clutch may be put into operation by drawing the chain on either side of the
hand chain wheel.
The application of the said invention to purposes other than driving hoisting
machinery differs in no essential respect from its application to hoisting machinery as
berein before described.
Dated this 5th day of September 1889.
W. T. WHITEMAN,
Agent for the Applicants.
COMPLETE SPECIFICATION.
A New or Improved Clutch for Driving Hoisting Machinery and for
other like Purposes.
We GEORGE TANGYE of the firm of Tangyes Limited of Cornwall Works Soho in
the County of Stafford Engineers and RICHARD GAY of No. 59 Corbett Street
Smethwick in the County of Stafford Mechanical Engineer do hereby declare the
nature of the said invention and the manner in which the same is to be performed to
be particularly described and ascertained in and by the following statement :-
The said invention consists of a clutch constructed and operating in the manner
hereinafter described. The said clutch is especially applicable to the driving of
hoisting machinery but may also be employed for driving other machinery.

page_text: We will describe the said invention in connection with a hoist.
On the side of the hand chain wheel which is not fixed to but turns freely on
the shaft of the hoist, an eccentric is fixed, the said eccentric being preferably cast
in one piece with the said hand chain wheel. A clip surrounding and turning
freely on the said eccentric carries an arm or pin at the end of which is a swivelling
gripping piece which overhangs a pulley fixed on the shaft. When the chain wheel
is operated upon by means of its chain the eccentric carried by it having performed
somewhat less than a semi rotation the clip working on the eccentric is drawn
nearer to the axis of the shaft and the gripping piece is made to bear upon and
grip the fixed pulley and carry it and its shaft round with the hand chain wheel.
The load raised will remain suspended until the brake of the hoist is released.
The hand chain wheel clip and gripping piece will then travel with the fixed pulley
until the gripping piece has reached its lowest point. The fixed pulley will now
rotate without carrying with it the gripping piece and hand chain wheel, the weight
of the gripping piece keeping it in its lowest position and out of gear with the
fixed pulley until its position is changed by the motion of the hand chain wheel.
In lowering the load the chain of the hand chain wheel is paid out with slight
resistance and the descent of the load is under the complete control of the operator.
Generally the hand chain wheel will not be carried more than one half of a rotation
before it is wholly freed from the shaft and fixed pulley.
The clutch or gripper may be put into operation by drawing the chain on either
side of the hand chain wheel.
We will now proceed to describe with reference to the accompanying Drawings the
manner in which the said invention is to be performed.
Figure 1 represents in section and Figure 2 in elevation a portion of a travelling
hoist to which the new or improved clutch is applied, the clutch or gripping piece
being represented out of action and the hand chain wheel unconnected with the driving
shaft of the hoist ;
Figures 3, 4 and 5 represent front elevations of the same, Figures 3 and 4 representing
the gripping piece in action and Figure 5 the same out of action or in the position
shown in Figures 1 and 2 ;
Figures 6 and 7 represent the parts of the clutch drawn to a larger scale and
Figures 8 and 9 represent a modification of the clutch as hereinafter described.
The same letters of reference indicate the same parts in the several Figures of the
Drawings.
d
a is the hand chain wheel and a² is the endless hand chain of the same. The said
hand chain wheel a turns freely on the driving shaft 6 of the hoist; g is a pulley fixed
upon the driving shaft b and h, h are the ordinary guiding rollers of the hoist coupled
together and working on the girder i as usual. On the inner side of the boss of
the hand chain wheel a an eccentric c is cast or made and turning freely on the said
eccentric is a clip d to which a gripping piece f is connected by the screw pin or an
arme on the said clip, the said gripping piece f and clip & constituting a swivelling
gripper or clutch. The inner or acting edge of the gripping piece has the same con-
figuration as that of the periphery of the fixed pulley g and the said gripping piece f
has the position with respect to the pulley represented, that is, it overhangs or is
situated at the periphery of the said fixed pulley. By the action of the eccentric c
upon the clip d' the latter is drawn nearer to the axis of the shaft 6 and the gripping
piece carried by the said clip is made to grip the fixed pulley g. That is to say,
when the chain wheel a is operated upon by means of its hand chain a² the eccentric c
on its boss having performed a little less than a semi rotation from its position
Figures 12 and 5 lifts the clip d and draws the gripping piece f into contact
with the periphery of the fixed pulley gas illustrated in Figures 3 and 4. The gripping
piece being thus made to grip the fixed pulley the said gripping piece is carried
round with the said pulley together with the hand chain wheel a. Thus the semi
rotation of the band chain wheel a in one or other direction by the pulling of the
raising or lowering side of the hand chain a² as indicated by the arrows in Figures 3
and 4, brings the clutch mechanism into action and gears the hand chain wheel a

page_text: with the driving shaft 6 the clip and clutch also rotating with the shaft. The con-
tinued rotation of the hand chain wheel a after the gearing of the clutch causes the
load to be raised the load remaining suspended until the brake of the hoist is released.
In lowering the load the chain of the hand wheel a is paid out with slight resistance
so as to maintain the said wheel in gear with the shaft 6 and the descent of the load
is under the complete control of the operator.
On releasing the brake of the hoist the hand chain wheel a clip d and gripping
piece travel with the pulley 9 say for about half a rotation when by the changed
position of the eccentric c the gripping piece f is released from the pulley 9 and by
its weight takes its lowest position as represented in Figures 1. 5. 6 and 7. The
gripping piece being thus taken out of gear with the fixed pulley g the chain wheel a
is no longer connected with the driving shaft b the weight of the gripping piece f
assisted by the weight a' cast or fixed between the arms on the side of the hand chain
wheel as seen in Figures 3. 4 and 5 keeping it in its lowest position and out of
gear with the fixed pulley g until the position of the said gripping piece is changed
in the act of raising the load by the motion of the hand chain wheel a acting through
the eccentric c and clip d as before described.
The acting part of the gripping piece and periphery of the fixed pulley may be
modified in the manner represented in Figures 8 and 9. That is to say the gripping
piece is made in the form of a strong tooth and the periphery of the fixed pulley g³
has an undulating or toothed figure the said strong tooth when it is lifted by the
action of the eccentric upon the clip causing it to engage with a depression in or
between the teeth of the wheel 92 and gear the chain wheel a with the shaft bas
before described.
Having now particularly described and ascertained the nature of the said inven-
tion and the manner in which the same is to be performed we declare that we claim
as the said invention :-
A new or improved clutch for driving hoisting machinery and for other like
purposes the parts of which clutch are constructed combined and used substantially as
hereinbefore described and illustrated in the accompanying Drawings; that is to say
a clutch consisting essentially of a gripper or gripping piece carried by a clip fitted
and working loosely upon an eccentric on the boss of the hand chain wheel or other
driving wheel which wheel turns loosely on the driving shaft the motion of the loose
hand chain or other driving wheel through about half a rotation causing the gripper
or gripping piece to bear upon and grip or engage with a fixed pulley on the shaft of
the hoist or other shaft to be driven so as to gear the said hand wheel with the said
shaft and thereby drive the hoisting or other machinery substantially as described and
illustrated.
Dated the Eighth day of May 1800.
GEORGE TANGYE.
RICHARD GAY.