Year: 1887

page_text: Date of Application, 14th Dec., 1887
RES
Complete Specification Left, 14th Sept., 1888
Complete Specification Accepted, 2nd Nov., 1888
We THOMAS BAILEY, Engineer, and JOSEPH COOK, Steel Manufacturer both of
Washington in the County of Durham do hereby declare the nature of said invention
to be as follows:-
Our invention relates to a new or improved construction and operation of friction
clutches sliding upon keys on a shaft, for putting a driving or driven toothed wheel,
pulley or drum running loose upon said shaft, into or out of action whereby the
gripping action of two clutches is secured, and is specially adapted to cases where a
considerable power has to be transmitted through the shaft.
It consists in providing both sides of the wheel, pulley or drum with a cone into or
over which corresponding reverse cones on separate clutches sliding on keys are
simultaneously forced into frictional contact and thus cause the wheel pulley or drum
to be driven by or to drive the shaft the strain being equally divided on each side.
We propose to bring the two clutches into frictional contact with the wheel, pulley
or drum by right and left hand screws on a spindle with nuts working thereon attached
by trunnions to the free ends of the clutch levers the spindle being rotated by a
handle or hand wheel to engage or disengage the clutches or, in cases where quicker
action with less power is required, a lever with reverse action by links to ends of
clutch levers may be used to draw them into or out of frictional contact with the cones
on wheel, pulley or drum.
By this construction and method of application of double action clutches the
frictional driving power is greatly increased while the wheel, pulley or drum is gripped
fairly between the two clutches instead of being forced against a collar on shaft and
the driving strain is equally divided thus preventing break downs by sudden application
of the single clutch on one side of the wheel, pulley or drum.
D: 141L
CD
1. 1007

page_text: We THOMAS BAILEY Engineer and JOSEPH COOK Steel Manufacturer both of
Washington in the County of Durham 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:-
Our invention relates to a new or improved construction and operation of friction
clutches, sliding upon keys, on a shaft for putting a driving or driven toothed wheel,
pulley or drum, running loose upon said shaft into or out of action whereby the gripping
action of two clutches is secured and is specially adapted to cases where a considerable
power has to be transmitted through the shaft.
It consists in providing both sides of the wheel, pulley or drum with a cone into or
over which corresponding reverse cones on separate clutches sliding on keys are
simultaneously forced into frictional contact and thus cause the wheel pulley or drum
to be driven by, or to drive, the shaft, the strain being equally divided on each side.
We propose to bring the two clutches into frictional contact with the wheel pulley
or drum by right and left hand screws on a spindle with nuts working thercon attached
by trunnions to the free ends of the clutch levers the spindle being rotated by a handle
or hand wheel to engage or disengage the clutches or, in cases where quicker action
with less power is required, a lever with reverse action by links to ends of clutch
levers may be used to draw them into or out of frictional contact with the cones on
wheel pulley or drum.
By this construction and method of application of double action clutches the
frictional driving power is greatly increased while the wheel pulley or drum is gripped
fairly between the two clutches instead of being forced against a collar on shaft and
the driving strain is equally divided thus preventing breaks down by sudden application
of the single clutch on one side of the wheel pulley or drum.
Figure 1, shows partly in section and partly in elevation, our double clutch applied
to a spur pinion running free upon a shaft and Figure 2 shews an end view of same
the engaging or disengaging being effected by a screw with right and left hand
threads.
Figure 3 shews an external view of our double clutch in every way similar to
Figures 1 and 2 except that the engaging or disengaging is effected by a hand lever
operating by reverse action upon the clutch levers.
A is the shaft having upon it running free the spur pinion B with a female coned
circular groove C on each side D D' are the clutches with male circular cones E E
each sliding on keys F, sunk in the shaft, into or out of frictional contact with the
grooves CC¹ in spur pinion B by the operation of the levers G G¹, embracing the
clutches D D¹ and connected at their free ends by "trunnion" nuts H H to the right

page_text: and left hand screw J which is actuated by a handle K to cause the clutches to engage
with or disengage from the spur pinion and so to cause it to drive from the main shaft
or to run free upon it.
In Figure 3 the engaging or disengaging of the clutches D D¹ is effected by a hand
lever L having links M M on each side of its fulcrum N (which is fixed) attached to
the free ends of the clutch levers G G which hand lever being worked in one direction
engages and in the other disengages the clutch from the spur wheel B.
Having now particularly described and ascertained the nature of said inven-
tion and in what manner the same is to be performed we declare that what we
claim is
The application of a double grip friction clutch, comprising two clutches acting in
opposite directions for the purpose of putting into or out of gear a driving or driven
toothed wheel pulley or drum and mechanism for effecting such action substantially
as described and shown.