Improvements in Set Collars for Shafting.
Year: 1891

page_text: Date of Application, 29th Oct., 1891
Complete Specification Left; 27th July, 1892-Accepted, 27th Aug., 1892
PROVISIONAL SPECIFICATION.
Improvements in Set Collars for Shafting.
FRANK TRIER Civil Engineer 19 Great George Street Westminster London
S.W. do hereby declare the nature of my invention to be as follows:-
Set collars are now made of a solid metal ring & are fixed on the shaft in the
place they are to occupy by means of a set screw the heads of which generally
project above the surface of the ring. These collars can only be put on or taken
off the shaft by slipping them over the end of the latter, thus necessitating lifting
the shaft & often displacing pullies etc. in order to put on or take off a collar &
occasioning great loss of time & labour. The projecting setscrews are a source of
much danger to workmen and countersinking the heads necessitates thickening the
collars & the use of box-spanners. The set screws easily shake loose as they only
depend for contact with the shaft on their points & do not really clamp the collar
to the shaft.
These solid collars also often rust on the shaft & are then most difficult to
remove.
My improved collars obviate all these disadvantages. I make my collar in two
parts or halves which are held or drawn together by two screws each of which
consists of an hexagonal or square part or a round part with holes for applying a
tommy in between two stems one of which has a right hand the other a left hand
thread. The part of the screws to which the spanner or tommy is applied lies
wholly within a gap between the two halves of the collar & does not project beyond
the circumference of the latter. By turning the screws the halves are drawn
together firmly clamping the shaft. The shape of collar which lends itself best to
this construction is a cylindrical ring with a raised rib or web in the centre
of section which coincides in radius as nearly as possible with the hexagonal part
or head of the right & left handed screws.
Instead of using two right & left handed screws I generally replace one by an
ordinary screw with its head countersunk in the body of the collar. In this case I
nearly draw the two halves of the collar together with the right & left handed
screw. The opposite ends of the collar halves are then screwed together with
the ordinary screw & finally the right & left handed screw is used to produce the
pressure & firmly clamp the collar on the shaft. I sometimes form the ends of the
two halves which do not receive the right & left handed screw in such a way that
they engage one with the other like a hinge, in which case I can fix them together
by means of a hinge pin always relying on the right & left handed screw to clamp
the collar firmly on the shaft. I do not confine myself to the methods named in
fixing together the ends of the collar halves opposite the ends joined by the right
& left handed screws. In very wide or large collars I may use more than one right
& left handed screw on the same side of the split collar.
Dated this 20th dox of Ortsbor 1801
COMPLETE SPECIFICATION..
Improvements in Set Collars for Shafting.
I, FRANK TRIER Civil Engineer of 19 Great George Street, Westminster
London 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 :-
Set collars are now made of a solid metal ring & are fixed on the shaft by means

page_text: of setscrews the heads of which generally project above the surface of the ring.
These collars can only be put on or taken off the shaft by slipping them over the
end of the latter, thus necessitating lifting the shaft & often displacing pullies etc.
in order to put on or take off a collar-the operation entailing great loss of time &
labour. The projecting setscrews are a source of much danger to workmen &
countersinking the heads. necessitates thickening the collars & the use of box
spanners.
The setscrews easily shake loose as they only depend on their points for contact
with the shaft & do not really clamp the collars to the shaft. These solid collars
are liable to rust on the shaft & are then most difficult to remove. My improved
collars obviate all these disadvantages. The accompanying drawings show one of
the collars in two views. It consists of two parts or halves R R held & drawn
together by the two screws S & T. I prefer to give to the parts R R the shape
shown, so that they form together a partially hollow ring with a central enlargement
of semi-circular section, a gap being left for the head of the screw S. This screw
is double ended, one end having a right & the other a lefthanded thread & the head
is shaped so as to lie wholly within & to nearly quite fill the gap just mentioned &
to form a continuation of the central enlargement of the ring. Tommyholes are
provided in the head by means of which the two ring halves can be firmly drawn
together for clamping the shaft. The screw T is an ordinary cheeseheaded screw
with the head sunk within the circumference of the ring & is preferable to a second
right & lefthanded screw as it enables the ringhalves to be more easily put together.
The halves R R do not form a complete circle a very small gap being left at g.
When putting the collar on a shaft, I first nearly draw the two ringhalves together
leaving the gap g, I then screw the opposite ends of the ringhalves tightly together
by means of the screw T & finally the screw $ is used to produce the pressure &
firmly clamp the collar on the shaft. At the same time a strain is put on the
screw T which prevents it shaking loose. The ends of the ringhalves fixed by the
screw T may be fixed together in other ways, but I always rely on the right & left-
handed screw S for firmly clamping the collar on the shaft. In large & wide
collars I sometimes use more than one screw S.
Having now particularly described & ascertained the nature of my said inven-
tion, & in what manner the same is to be performed, I declare that what I
claim is:
The construction of a setcollar for shafting in two halves drawn together by one
or more than one right & lefthanded screw, the head of the latter lying wholly
within the circumference of the collar substantially as hereinbefore described &
illustrated.
Dated this 27th day of July 1892