Improvements in Friction Clutches or Couplings.
Year: 1890

page_text: Date of Application (in United Kingdom), 21st Apr., 1890
Complete Specification Left. 21st Apr. 1890-Accepted. 14th June, 1890
COMPLETE SPECIFICATION.
Improvements in Friction Clutches or Couplings.
1, CARL FORNANDER of Soderhamn, Sweden, Engineer, 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 :-
The present invention relates to a device for transmitting motion by means of
friction from a rotating part of a machine either to another shaft in the same axial
line or to a gear wheel or pulley mounted on aforesaid rotating part and is represented
in the accompanying drawings in which fig. 1 is a transverse section of the friction
clutch, fig. 2 a longitudinal section and figs. 3-6 details of the same.
To the shaft a there is attached a cylindrical bush, sleeve or ring b having on its
outside a groove e in parallel direction to the axis. The ring b is encircled by
another bush, sleeve or ring d the inside of which is provided with a taper groove e
and corresponding in position to the groove c.
The bottom of the groove e is cut
through throughout the whole length of the ring d. In the recess or aperture formed
by the two grooves cand e is fitted a key or bolt (fig. 5) partly of a rectangular
section to correspond with the groove c in the ring b and partly taper or wedge-shaped
to correspond with the groove e in the ring d. The exterior part g of this bolt is
of cylindrical shape and passes through a correspondingly formed hole in a usual fork
operated ring capable of sliding longitudinally on the shaft; the bolt heing provided
at its end with a stop nut i. On the ring d finally is applied the ring to be operated
by the clutch or the boss of the wheel to which is to be transmitted the rotation of
the shaft a.
The operation of this clutch will now easily be understood.
By moving the fork ring to and fro along the shaft and its operating part or
flange thereby against the shoulder k and the nut i the key or bolt is respectively
driven into and drawn out of the aperture formed by the grooves cand e with the
result that the ring d acted upon by the key or bolt when it is being forced in is
pressed against the surrounding frictional surface of the clutch or wheel whereby a
sure friction clutch is provided, the clutch is disengaged by moving the fork ring h
in a contrary direction so as to draw out the key or bolt.
For moving the fork ring any suitable arrangement may be used, figs. 6 and 7
representing as examples two different arrangements for that purpose.
The length of the rod g admits of the ring having play enough to strike the
shoulder & or nut i sharply so that in the event of the key f becoming jammed or
fixed in the opening ce the smart blow given by these means will release it and move
it into its required operative or inoperative position.
If desired the groove c may be formed directly in the shaft a in which case the
sleeve would be dispensed with.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is ;-
1. A friction clutch or coupling consisting of two cylindrical bushes sleeves or

page_text: rings such as bd one within the other between the driving shaft a and the boss to
which is to be transmitted the motion of the shaft a the inner ring being attached to
the shaft and having its outside provided with a groove such as c and the outer ring d
fitting loosely round the inner ring and provided on the inside with a taper groove e
which is cut through at its bottom and of a key or bolt fitting in the grooves suitable
apparatus for moving bolt substantially as described and illustrated in the accom-
panying drawings.
2. In a friction clutch as claimed in the preceding claiming clause an arrangement
for moving the key or bolt f longitudinally in the aperture ce by means of a blow,
consisting of a rod or bolt such as g fitted in a hole in the fork operated ring h
mounted on the shaft a each end of the bolt ġ being provided with a stop i or the
whole in combination with any suitable device for moving the fork ring against the
said stop substantially as described and illustrated in the accompanying drawings.
3. The complete clutch or coupling substantially as herein described and illustrated
in the accompanying drawings.
Dated this 21st day of April 1890
W. P. THOMPSON & BOULT,
Agents for the Applicant.