Improvements in Thrust Shafts or Shafts Subject to End Pressure.
Year: 1893

page_text: Date of Application,. 27th Mar., 1893
Complete Specification Left, 27th Nov., 1893-Accepted, 30th Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in Thrust Shafts or Shafts Subject to End Pressure.
I, EDWARD REYNOLDS, of River Don Works, Sheffield, Engineer, do hereby
declare the nature of this invention to be as follows:-
It has been usual to provide for the end thrust, to which shafts such as those
of screw steam ships are subject; by forming thereon one or more collars, this.
being effected by forging the shaft sufficiently large in diameter to allow of its-
being deeply grooved to form the collars.
This method is for many reasons undesirable. According to my invention in,
order to allow of the shaft being forged but slightly larger than is required for the
work it has to perform, I form the said thrust collars separately from the shaft,.
and I secure the same to the shaft by cutting upon the latter either a screw thread,
or small collars of any other form, of sufficient strength to resist the end thrust,
but not large enough to be treated as rubbing surfaces, and I secure upon these-
threads or small collars detachable collars, which in the case of a shaft having-
flanges at both ends would be made in two or more parts suitably united together,.
such collars being provided with keys to ensure their rotation with the shaft.
Dated this 27th day of March 1893.
ABEL & IMRAY,
Agents for the Applicant..
COMPLETE SPECIFICATION.
Improvements in Thrust Shafts or Shafts Subject to End Pressure..
I, EDWARD REYNOLDS, of River Don Works, Sheffield, 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 :--
It has been usual to provide for the end thrust to which shafts such as those of
screw steam ships are subject; by forming thereon one or more collars, this being
effected by forging the shaft sufficiently large in diameter to allow of its being
deeply grooved to form the collars.
This method is for many reasons undesirable. According to my invention, in
order to allow of the shaft being forged but slightly larger than is required for the
work it has to perform, I form the said thrust collars separately from the shaft,
and 1 secure the same to the shaft by cutting upon the latter either a screw thread,.
or small collars of any other form, of sufficient strength to resist the end thrust,.
but not large enough to be treated as rubbing surfaces, and I secure upon these
threads or small collars detachable collars, which in the case of a shaft having
flanges at both ends would be made in two or more parts suitably united.
together, such collars being provided with keys to ensure their rotation with the
shaft.
Fig. 1 of the accompanying drawings is a side view of a shaft with a thrust
collar according to my invention fixed thereon.
Fig. 2 is a transverse section on X X of Fig. 1.
At the place where a collar is fixed, the shaft A is made a little larger in
diameter than it is elsewhere, and in this enlarged part are cut beds of the keys B.
The collar is made in halves C C, a key B being sunk in each half, and the
halves are secured together on the shaft by bolts and nuts D. To prevent the
collar from moving longitudinally along the shaft the enlarged part has a screw:

page_text: thread or a number of grooves cut on its periphery, the collar being screw threaded
or grooved internally to fit the thread or grooves on the shaft. As the threads or
grooves extend over the whole length of the collar, they may be very shallow,
their number furnishing the necessary strength to resist movement of the collar
when it is subjected to thrust.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I declare that what 1
claim is
The construction of a thrust shaft with a collar or several collars fixed thereon,
substantially as and for the purpose set forth.
Dated this 27th day of November 1893.
ABEL & IMKAI,
Agents for the Applicant.