IMPROVEMENT IN FRICTION CLUTCHES, FOR HAULING MACHINERY LINES OF SHAFTING LOOSE PULLIES AND THE LIKE
Year: 1885

page_text: I JOHN DAVISON of Bells Close Engine Works Scotswood, Newcastle on Tyne
Millwright and Engineer do hereby declare the nature of my invention for
IMPROVEMENT IN FRICTION CLUTCHES, FOR HAULING MACHINERY LINES OF
SHAFTING LOOSE PULLIES AND THE LIKE and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
In carrying out my invention I make a brake disc A with two or more
openings formed in the web of the disc between the central boss and the rim of
the disc, in these openings I mount two or more bevil pinions B turning freely on
spindles C fixed in holes formed in the thickness of the web of disc, and held in
position by split cotters.
The disc A with the two or more pinions B is mounted loosely on the motor
shaft D and is clasped by two half brake straps jointed to a pin fixed to
bracket F on framing on one side of the disc, and linked to a compound lever G on
the opposite side.
The above mentioned bevil pinions gear on one side with a bevil H wheel keyed
to motor shaft, and on the opposite side with a bevil wheel J not keyed to motor
shaft but bolted to winding drum K or loose pully, or on a line of shafting keyed
to the line of shafting to be driven, the Brake disc in all cases being with the Bevil
Pinions mounted loosely on the motor shaft between the bevil wheel keyed to the
motor shaft and the bevil wheel which is to be driven.
By pressing down the compound lever G and tightening the two half straps E E
it is evident the disc will be held fast and the pinions B B mounted in the web of
the disc will transmit motion from the Bevil Wheel E keyed to motor shaft, to the
Bevil Wheel J, fixed to drum, K loose pully or line of shafting at the same speed
as the motor shaft but in a contrary direction.
It is also evident that when the pressure is taken off the Brake straps the Disc A
with its pinions B B will simply roll over the face of the Bevil Wheel J to be

page_text: driven without transmitting motion, as shown by Drawing with references
enclosed, viz.―
A, Brake Disc loose on Motor Shaft D.
B B, Bevil Pinions loose on Spindles C C.
CC, Fixed Spindles.
D, Motor Shaft.
E E, Half Brake Straps.
F, Fixed Bracket.
G, Compound Lever.
H, Bevil Wheel keyed to Motor Shaft.
J, Bevil Wheel fixed to Drum or loose pully.
K, Winding Drum or Pully loose on Motor Shaft, where it is requisite that the
Drum, Loose Pully, or line of shafting should revolve in the same direction as the
motor shaft. I make the Bevil pinion with parallell pinions formed on the back
of the Bevil pinions but of larger diameter than the Bevil part, these compound
pinions are mounted in the web of the Brake disc in the same manner as the
single Bevil Wheels but on two spindles fixed parallell to each other at a suitable
distance between the centres to allow the parallell part of the compound pinions to
gear into each other while the Bevil parts are revolving clear of each other, thus
the motion is transmitted through the compound pinions in the same direction as
the motor shaft.
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
1st A Friction clutch consisting of a brake disc carrying two or more Bevil
Pinions, which gear with two Bevil Wheels at opposite sides of the disc one fixed
to the motor or driving shaft, and the other to the shaft, drum or loose pully to
be driven all substantialy as and for the purposes hereinbefore set forth.
2nd In a friction clutch as before described the use of a brake strap made in
halves and actuated by a compound lever.
3rd The general application of the herein before described friction clutch as a
disengaging gear, and for the purpose of a safety clutch.