Year: 1887

page_text: I JAMES MARSHALL of the Firm of Marshall Sons and Company Limited of Britannia
Iron Works Gainsborough in the County of Lincoln Engineers do hereby declare the
nature of this Invention to be as follows:-
My Invention has for its object to provide an efficient clutch simple in construction
and not liable to get out of repair and very efficient in action.
I will describe my Invention as applied to the coupling of two shafts in line. On
the end of the one shaft is fixed a disc with a flange or rim upon the internal
periphery or side of which the coupling devices carried by the other shaft bear to
couple the two shafts together. The said other shaft has fixed to its end what may be
described as a circular box with a number of radial divisions of which accommodate
the aforesaid coupling devices which each consist of an outward portion (which bears
upon or engages with the portion on the other shaft as aforesaid) and a stem which can
slide outwards and inwards in a boss in each division which boss acts as a guide for
the stem whilst the sides of the upper parts of the divisions act as guides for the
outward portion of the coupling device. Each such coupling device is internally
screwed and with it engages a quick threaded screw abutting against the inner side or
bottom of the division. The screws are each provided with a lever by which they can
be turned. These levers are connected by links with a collar sliding on the shaft and
operated by a forked lever or otherwise. Thus when this collar is slidden in one
direction the levers are all operated so that they give a movement of equal extent of
partial rotation to all the quick threaded screws and consequently cause the coupling
devices to move outwards and bear on or engage with the portion on the adjacent
shaft to which motion is to be imparted.
By moving the sliding collar in the other direction the levers and screws will be
reversely moved and the shafts will be uncoupled. In order to allow for the
adjustment of the levers on the screws to take up wear the engagement of the two
may be effected by a series of ribs and grooves around the interior of the hole in the
lever through which the neck of the screw passes the said neck being provided
with corresponding grooves and ribs for their engagement, the said grooves and ribs
being of such small width as will give the requisite degree of adjustment by
moving the lever round to the extent of a rib and groove to take up wear.
Dated this 4th day of February 1987
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C.,
Agents for the said J.. Marshall..

page_text: I JAMES MARSHALL of the firm of Marshall Sons & Company Limited of Britannia
Iron Works Gainsborough in the County of Lincoln Engineers 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 :-
My Invention has for its object to provide a clutch for coupling shafts and the
like simple in construction not liable to get out of repair and very efficient in
action.
Each of the
I will describe my Invention with reference to the accompanying drawings
Figures 1 and 2 of which represent in side elevation and front view respectively the
improved clutch as applied to the coupling of two shafts arranged in line. On the
end of the one shaft A is fixed a disc B having a flange or rim C upon the internal
periphery or side of which, the coupling devices carried by the other shaft D bear to
couple the two shafts together. The shaft D has fixed to its end a crosshead E
provided with projections F upon which segmental blocks or partial discs G are fitted
to slide radially towards and from the axis D as hereinafter described.
segmental blocks G is internally screwed or provided with nuts at H as shewn and
with these nuts engage corresponding screw threads formed on the opposite ends of
spindles I mounted in bearings in arms K on the crosshead E, the screw threads on
the opposite ends of each spindle being respectively a right hand and a left hand
screw, and engaging respectively with the nuts or internal screw threads in the two
opposite segmental blocks G so that by turning the screw spindles the blocks G are
simultaneously forced outwards or drawn inwards according to the direction in which
the screws are turned. The screw spindles I are each provided with a lever K' by
which they can be turned. These levers are connected by links L with a collar M
fitted to slide on the shaft D and operated by a forked lever or arms N fast on a
spindle O as shewn or otherwise. Thus when the collar M is slidden along the shaft Din
one direction the levers K' are operated so that they give a movement of equal extent
of partial rotation to the screw threaded spindles I and consequently cause the
segmental blocks G to move outwards and bear on or engage with the internal surface
of the rim C of the disc on the adjacent shaft A to which motion is to be imparted.
By moving the sliding collar in the other direction the levers K' and the screw
spindles I will be reversely moved and the shafts will be uncoupled.
In order to allow for the adjustment of the levers on the screws to take up wear,
the screw spindles at the part where the levers K' are attached are provided with a
series of ribs and grooves a with which engage corresponding ribs and grooves b
formed in the interior of the bosses c of the levers through which the necks of the
screw spindles pass as shewn in the detail Figure 3. These grooves and ribs are of such
small width as will give the requisite degree of adjustment by moving the lever round
to the extent of a rib and groove to take up wear.

page_text: Having now particularly described and ascertained the nature of this Invention and
in what manner the same is to be performed I declare that what I claim is.
1st. In friction clutches the employment of a screw spindle or of screw spindles
each provided at its opposite ends respectively with a right hand and a left hand screw
thread working in corresponding internal screw threads or nuts provided in separate
friction blocks, the screw spindle or screw spindles being operated by means of a
lever or levers connected to a sliding collar carried on one of the shafts or the like, to
be coupled and operated substantially as hereinbefore described with reference to the
accompanying drawings.
2nd. In friction clutches operated by screws and levers as herein before described
means for adjustment to compensate for wear substantially as herein before described
with reference to the accompanying drawings.
3rd. The general construction combination and arrangement of parts constituting
improvements in clutches as hereinbefore described and illustrated by the accompanying
drawings.