Improvements in Thrust Blocks of Screw Propeller Shafts, and in Means or Apparatus for Lubricating the same.
Year: 1889

page_text: Date of Application, 12th Nov., 1889
Complete Specification Left, 12th Aug., 1890-Accepted, 20th Sept., 1890
PROVISIONAL SPECIFICATION.
Improvements in Thrust Blocks of Screw Propeller Shafts, and
in Means or Apparatus for Lubricating the same.
We, JOHN FRANCIS HALL of Norbury, Pitsmoor, Sheffield, Manager of Steel
Works, and Jonx VERITY of Billing Baulk, Bramley, near Leeds, Engineer, both in
the County of York, do hereby declare the nature of this invention to be as
follows:-
"
The object of our invention is to provide means whereby the friction between the
faces of the "thrust collars" and the thrust bearings is reduced to a mimimum.
For the above purpose we provide a ring which is placed on the shaft between
the shaft thrust collar and the thrust block having a flat face next to the collar.
The opposite face is of a convex form which fits into a concave recess in the "thrust
block. The flat face of the ring next to the collar is recessed, such recess or
recesses being connected by suitable passages to a tube or tubes through which the
lubricant can be forced between the face of the collar and that of the ring by ordinary
means.
+6
By the above arrangement the
thrust collar is forced away or apart from the
thrust ring and bearing, so that the friction between them is almost completely,
overcome so long as the supply and pressure of the lubricant is kept up.
Dated this 12th day of November 1889.
J. W. HARDING,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Thrust Blocks of Screw Propeller Shafts, and
in Means or Apparatus for Lubricating the same.
We, JOHN FRANCIS HALL of Norbury, Pitsmoor, Sheffield, Manager of Steel
Works, and JouN VERITY of Billing Baulk, Bramley, near Leeds, Engineer, both in
the County of York, 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 object of our invention is to provide means whereby the friction between the
faces of the thrust collars and the thrust bearings is reduced to a minimum.
In the accompanying drawings.
Fig. 1 is a half end elevation and half section with shaft and collar removed.
Fig. 2 is a longitudinal section and part elevation.
Fig. 3 is a plan looking at the top, having half of bearing caps removed.
Fig. 4 is a transverse section of thrust block ring, and Fig. 5 shews half end
elevation and half section of the same.
A is the shaft, B is the thrust collar, provided thereon, and for the purpose of pre-
venting friction we employ between the thrust collar B and the thrust bearing C, the
ring D which is provided on the shaft A between the shaft thrust collar B and the
thrust bearing C, having its flat face D' next to the thrust collar B. The opposite
face D is of a convex form and fits into a concave recess in the thrust bearing C.
The flat face D' next to the collar B is recessed at E. such recess or recesses being
connected by a suitable passage For passages to a tube G or tubes, through which
the lubricant can be forced between the face of the thrust collar B and the ring D by
a force pump or other convenient means.
The face of the ring D may preferably be covered with a plate or disc H of gun
or other suitable metal, such plate or disc being attached thereto by screws I or other
convenient means.

page_text: Besides the recess E in the face of the ring, we provide any number of annular
channels J, such channels being for the reception of oil, and to assist in the more
perfect lubrication.
The ring D is prevented moving or turning round during the motion of the shaft
by means of the projecting piece K fitted into the recess L in the cover M, such cover
being also used for preventing the escape or flying off of the oil whilst the shaft is
revolving.
For the purpose of more readily placing the ring D on the shafi A, we make it
in two halves as shewn at Figs. 4 and 5, securing the same together when in position
by bolts N.
In the above improvements we force the oil through the passage or passages above
referred to, from which it passes at a high pressure into the recess E, and by such
pressure the lubricant is forced between the face of the thrust collar and that of the
ring so that the two faces are not actually in contact, the result being that so long as
the pressure is kept up very little wear takes place on the respective faces. The oil
after being used passes into the chambers O from whence it is drawn or pumped, and
again forced between the faces of the thrust collar and ring.
By having the back of the ring of a convex form, and fitting into a concave recess
in the thrust bearing, the shaft will work freely however much the shaft be strained
or out of line, as the ring will adjust itself to the varying positions of the face of the
thrust collar.
The above arrangement may when preferred be placed on both or either side of the
thrust collar, and the same is also applicable to any number of thrust collars on the
same shaft.
The bed plate R, and the bearing S shewn in drawing are of ordinary construction.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:
1st. The ring D with its passage F or passages, tube G or tubes, recess E or
recesses and channels J, arranged substantially as and for purposes herein set forth.
2nd. The arrangement, construction and application of ring D provided with or
without the plate or dise H, in combination with thrust bearings (', operating
substantially as herein set forth.
3rd. The arrangement, construction and combination of thrust bearing C and
ring D, with thrust collar B, all arranged and operating substantially as herein set
forth.
Dated this 19th day of An 1800
J. W. HARDING,
Agent for the Applicants.