This document describes patent GB780095 (A) filed in 1957 for improvements to friction couplings. It details a friction coupling that provides an audible alarm when slipping occurs. The coupling has two plates urged together by springs with clutch plates and a fabric-lined slip plate in between. When slipping causes the slip plate to rotate, it actuates an audible alarm by striking a bell or making a clicking sound through ratchet teeth and a spring. The invention provides a friction coupling with an alarm to prevent damage from obstructions in powered machines.

1. * GB780095 (A)
Description: GB780095 (A) ? 1957-07-31
Improvements in or connected with friction couplings
Description of GB780095 (A)
PATENT SPECIFICATION
Inventor: JOHN ANDREW FISHLEIGH Date of filing Complete Specification:
Feb. 23, 1956.
( t} Application Date: Feb. 23, 1955. p' Complete Specification
Published: July 31, 1957.
Index at acceptance:-Class 80(2), S2(A3A: X).
International Classification:-FO6d.
lo. 5432/55.
COMPLETE SPECIFICATION
Improvements in or Connected with Friction Couplings We, J. A.
FISHLEIGH & SON LIMITED, Of North Fordlands, Northaam, Bideford,
Devonshire, a British Company, do hereby declare the inventions for
which we pray that a patent may be granted to us, and the method by
which it is to be performed, to be particularly described in and by
the following statement: -
This invention relates to a friction coupling, such as for use in a
baling machine or any other power driven machine, and has for its
object to provide a friction coupling which gives an audible alarm
when the coupling is slipping.
According to this invention, in a friction coupling incorporating two
plates or members, clutch plates or discs and a fabric-lined "slip"
plate or disc between the members, the members and clutch plates or
discs being urged together by spring pressure, an audible alarm is
incorporated and means provided so that when the friction coupling
slips, the "slip" plate or disc revolves and actuates the audible
alarm.
The invention will be dearly understood from the following description
aided by the accompanying drawings, in which:Figure 1 is sectional
elevation and Figure 2 an end view showing one example. Figure 3 is a
sectional elevation showing another example, and Figure 4 a detail

2. view.
In the example shown in Figures 1 and 2, the coupling comprises two
members in the form of discs 1, 2. One member 2 is formed with a
centre socket 3 having a splined or round bore for engaging on the
splined or round shaft of a baler or other machine in use, a lock
screw 4 or key being provided. The other member 1 is provided with a
rotatably mounted centre or hub 5 having a projecting splined shaft 6
on which a splined or round shaft of a universal joint from the
tractor or other power take off can be connected.
In each member 1, 2 is a ring of holes through which are passed bolts
7, the heads of the bolts 7 are outside one member 2 and on each bolt
7 and outside the member 1 is a (Price 3s. 6d.1 helical spring 8 with
a nut 9 so that the members 1, 2 are urged towards each other. Between
the members 1, 2 are two steel clutch plates 10, 11 in the form of
discs and' between these two plates 10, 11 are fibre or like discs 50
12, 13 riveted to a flange 14 of the hub 5, the springs 8 urging the
members 1, 2 and plates 10, 11 onto the fibre or like discs 12, 13 so
that the whole coupling turns with the rotation of the power drive
under frictional grip 55 between the fibre or like discs 12, 13 and
the clutch plates 10, 11, but if an obstruction occurs in the machine
being driven, the fibre discs 12, 13 slip and damage is avoided.
The steel plates 10, 11 are coupled to the 60 members 1, 2 by the
bolts 7 passing through half-circular recesses in the peripheries oil
the plates 10, 11.
On the outside of one member 2 is secured a bell 15 and on the other
side of the member 65 2 is rotatably mounted a wheel 16 set against
the flange 14, the wheel through a shaft actuating a striker 17 inside
the bell 15 so that if an obstruction occurs in the machine being
driven, the flange 14 or "slip" plate and fibre discs 70 12, 13 slip
and damage is prevented, the flange 14 also rotates the wheel 16
actuating the striker 17 and gives an audible alarm on the bell 15.
In the example shown in Figures 3 and 4, 75 the periphery of the
flange or slip plate 14 is formed with ratchet teeth 18 and on one
side of the bolts 7 is secured a spring 19, the free end of which
engages on the flange 14 so that if the flange 14 rotates in relation
to the 80 members 1, 2 an audible clicking sound is produced by the
end of the spring 19 riding over the ratchet teeth 18. More than one
spring can be employed.
Although the invention has been described 85 as applied to a baler it
should be understood that the alarm scan be applied to other friction
couplings.
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