Year: 1886

page_text: Date of Application, 24th Mar., 1886.
Complete Left, 23rd Dec., 1886.
Complete Accepted, 25th Jan., 1887.
I, ROBERT TATTERSALL of 5 St. John Street, Werneth in the Borough of Oldham
in the County of Lancaster, Millwright do hereby declare the nature of this invention
to be as follows:-
My Invention relates to couplings for shafts whose axes are in the same line and
consists in improved arrangements of such couplings for the purpose of allowing the
shafts to expand or contract freely according to the change of temperature and at the
same time make the coupling elastic, whereby excessive strains and breakages are
prevented.
In carrying out my invention I fix on the end of each of the two shafts to be
The boxes
coupled a bush or box by means of keys or in any other ordinary manner.
are bored to fit the shafts and are preferably so fixed that one of the shafts protrudes
beyond the end of its box and enters the other box, which is fixed on the other shaft
so that it projects beyond the shaft end. The shafts are held in position by collars at
their necks and are so adjusted that a space is left between the ends of the two shafts
and the two boxes. The boxes have double or multiple screw threads formed on their
outer surfaces, over which a cylindrical long nut with corresponding threads is pushed.
One of the boxes has a flanch cast on its outer end with a rim projecting inwards and
forming an annular recess on the box while the outer end of the second box is threaded
with an ordinary screw thread and a flanch with a projecting rim is screwed on to it,
forming an annular recess for the outer end of the second box. Into these recesses
thick india rubber washers or helical or volute springs or equivalent elastic cushions are
placed with loose metal washers to cover them, the cylindrical nut hereinbefore
described being between the washers.
When the shaft first receiving its motion from the driving motor begins to turn,
the threads on the box keyed upon it press against those on the cylindrical nut and as
the second shaft does not follow the rotation of the first immediately, but remains
stationary, the nut will be screwed or moved towards one or the other end, according
to the inclination of the threads and the direction of the rotation, and compress the
indiarubber washer springs or equivalent elastic cushion till the forces become,
equalized, when the threads on the nut act as drivers on the box of the second shaft

page_text: and take it round. On stopping, the elastic pressure of the india rubber or equivalent
cushion moves the nut back to its former position. The space between the ends of the
shafts and boxes allows them to expand freely by compressing the india rubber or
equivalent elastic cushion, one shaft making a very slight partial rotation relatively to
the other as they expand or contract.
Instead of both boxes being provided with screw threads, one of them only may be
thus provided and the cylindrical nut threaded for half its length and the other box
and half nut formed with a groove and feather or several grooves and feathers or their
mechanical equivalent. As one shaft starts while the other remains stationary, the
cylindrical nut will be moved towards one end and compress the indiarubber or other
springs till the forces become equalized when the second shaft will be taken round.
By this arrangement the different lengths of a line of shafting are started in succession
and the starting is eased while expansion is permitted by it at the same time. On
stopping the second shaft will overrun the first and by this in combination with the
action of the indiarubber or other springs the nut is brought back to its original
position.
EMMOTT & Co.,
Agents for the Applicant.

page_text: I, ROBERT TATTERSALL of 5 St. John Street, Werneth in the Borough of Oldham in
the County of Lancaster Millwright 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 relates to couplings for shafts whose axes are in the same line and
consists in improved arrangements of such couplings for the purpose of allowing the
shafts to expand or contract freely according to the change of temperature and at the
same time make the coupling elastic whereby excessive strains and breakages are
prevented.
In order that my invention may be more readily understood and carried into effect,
I have hereunto appended a sheet of drawings marked with letters of reference, similar
letters denoting similar parts on the different figures.
Figure 1 shows a section of one form of my improved coupling as fixed for use.
Figures 2, 3, 4 and 5 show outside views of the parts composing the coupling
separately.
Figure 6 shows a longitudinal section and figure 7 a cross section along line A B on
figure 6 of another form of the coupling.
с
In carrying out my invention in the manner shewn by figures 1 to 5 I fix on the
end of each of the two shafts a and b to be coupled a bush or box c and d by means of
keys a¹or in any other ordinary manner. The boxes are bored to fit the shafts and
are preferably so fixed that one of the shafts for instance & protrudes beyond the end of
its box d and enters the other box e which is fixed on the other shaft a so that it projects
beyond the shaftend. The shafts are held in their positions by collars at their necks
and are so adjusted that a space is left between the ends of the two shafts a and b and
the two boxes c and d as shewn on figures 1 and 6. The collars on one of the shafts
are placed near to the coupling while those on the other shaft are at its other end from
the coupling.
The boxes c and d have screw threads formed on their outer surfaces as shewn in
outside view by figures 2 and 3. Quadruple threads are shewn on the drawing, but
double or treble or any other kind of square threads may be used instead. Over the
bushes a cylindrical nut e, threaded correspondingly on the inside and long enough to
pass over both boxes, is pushed. This nut is shewn in section by figure 4 and in end
view by figure 5.
One of the boxes c has a flange c¹ cast on its outer end with a rim projecting
inwards and forming an annular recess on the box, while the outer end of the second
box d is threaded with an ordinary screw thread and a flange with a projecting rim
is screwed on to it, forming an annular recess for the outer end of the second box or
both boxes may have such flanges screwed upon them. Into the recesses thick india
rubber washers g, h or helical springs or volute springs as shewn on figure 6 or
equivalent elastic cushions are placed with loose metal washers k l, to cover them, the
cylindrical nut e hereinbefore described being between the washers.

page_text: When the shaft first receiving its motion from the driving motor begins to turn,
the threads on the box keyed upon it press against those on the cylindrical nut and as
the second shaft does not follow the rotation of the first one immediately, but remains
stationary, the nut will be screwed or moved towards one or the other end, according
to the inclination of the threads and the direction of the rotation, and compress the
india rubber washer, spring, or equivalent elastic cushion till the forces become
equalized, when the threads on the nut act as drivers on the box of the second shaft
and take it round. By this arrangement the different lengths of a line of shafting are
started in succession and the starting is eased. On stopping, the driven shaft will
overrun the driving shaft and by this in combination with the elastic pressure of the
india-rubber or equivalent cushion the nut is moved back to its former position. The
space between the ends of the shafts and boxes allows them to expand freely by com-
pressing the india rubber or equivalent elastic cushion, one shaft making a very
slight partial rotation relatively to the other as they expand or contract.
A modified form of my coupling is shewn by figures 6 and 7. Instead of both boxes
being provided with screw-threads one of them m only may be thus provided and the
cylindrical nut o threaded for half its length, and the other box n and half nut be made
cylindrical and a straight key or feather fixed to either the box or nut and the other
part made with a groove for the key or feather, or instead of one key and groove,
several keys and grooves may be used. The box n has a flange g with projecting rim
formed upon it, as shewn on figure 6 or screwed upon it and the other box m has a
similar flange screwed upon it and into the recesses india-rubber washers or helical
springs or volute springs s as shewn or equivalent elastic cushions. are placed. The
action of this arrangement of coupling on stopping and starting is similar to that of
the arrangement hereinbefore described with reference to figures 1 to 5, while expan-
sion and contraction can take place freely.
After unscrewing the flange f figure 1, or figure 6, the cylindrical nut can be
moved to that side and removed from the box a or m and the shafts conveniently
disconnected.
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
Firstly, the construction or arrangement of shaft couplings substantially as herein-
before described with reference to figures 1, 2, 3, 4 and of the drawing and for the
purposes set forth.
Secondly, the construction or arrangement of shaft couplings substantially as herein-
before described with reference to figures 6 and 7 of the drawing.
EMMUTT & CO.,
Agents for the Applicant.