Year: 1886

page_text: I, GEORGE MOLYNEUX PARK, of 12 Saint Barnabas Street, Blackburn, in the
County of Lancaster, Draughtsman do hereby declare the nature of this invention
to be as follows:-
This invention has for object to cause rotation of pistons in steam engines or
other apparatus such as pumps to obviate the unequal wear that ordinarily occurs
where the weight of the piston rests upon a part of a circumference. An arrange-
ment for this purpose comprises a cross-head fitted with an appliance by means of
which motion derived from the connecting rod is applied to slowly rotate the piston
rod and piston.
The piston rod is made separate from the crosshead and is attached to the same
in the following manner:
The piston rod is provided at the end with a collared neck which enters and fits
into a cylindrical socket formed in the body of the crosshead and is secured in this
position so as to be capable of rotation but is prevented from moving longitudinally
by a hook clamp made in two halves bearing against the said collared neck and
held in position by means of screws entering the body of the crosshead. Each
half of the said clamp hooks over a web formed on the crosshead and the two
halves are bolted together at the sides. Upon a collar formed on the piston rod is
keyed a worm wheel gearing with a screwed worm that is fixed between two jaws
formed on the top of the upper half of the clamp. Upon the axle of the screwed
worm is keyed a wheel formed with internal teeth upon its circumference and
gearing with a toothed wheel arranged loosely upon an eccentric boss which runs
loosely upon the axle of the screwed worn.
wheel are made of such a width as to enable them to gear with teeth provided on
the inner side of a fixed ring which attached by means of screws to one of the
jaws of the hook clamp. The number of teeth formed on the concentric wheel is
one in excess of the number arranged on the inner side of the fixed ring, and
consequently if the eccentric wheel be caused to roll round within the fixed ring
The teeth of the eccentric toothed

page_text: by revolving the said eccentric boss the concentric wheel advances only one tooth
in one revolution of the said eccentric boss.
The eccentric boss is rigidly connected with a ratchet wheel which is made to
advance by a catch connected with the ordinary connecting rod end by means of a
Llever and a link.
By these means a very slow rotation is constantly imparted in an intermittent
manner to the piston rod from the connecting rod while the engine or pump is
running.
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.

page_text: I, GEORGE MOLYNEUX PARK, late of 12 Saint Barnabas Street, but now of
20 Sarah Ellen Street, Blackburn, in the County of Lancaster, Draughtsman, 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:
This invention has for object to cause rotation of pistons in steam engines or
other apparatus such as pumps to obviate the unequal wear that ordinarily occurs
where the weight of the piston rests upon a part of a circumference. An arrange-
ment for this purpose comprises a cross-head fitted with an appliance by means of
which motion derived from the connecting rod is applied to slowly rotate the
piston rod and piston.
Referring to the accompanying sheet of drawings Fig. 1 is a side elevation
partly in section of apparatus according to this invention for rotating a piston the
rod only of which is shown in the drawing. Fig. 2 is a plan partly in section.
Fig. 3 is an elevation partly in transverse section taken in planes at right angles
to Fig. 1. Fig. 4 is a detail view. Fig. 5 is a transverse section on the line X X
Fig. 1.
1 is the rod of the piston to which rotary motion is to be imparted; it is
provided with a neck 2 and collar 2. 3, 3A is a cross-head into which the
collar 2 enters as shown. 4 and 5 are two parts forming a clamp with hooks
or projections 6, 6 for securing the piston rod to the cross-head. Each part of the
clamp is provided with a shoulder or part 8 that bears against the inner side of
the collar 2. The two halves of the clamp are secured together at the sides by
nuts and bolts 9. By this arrangement endwise movement of the rod in relation
to the cross-head is prevented whilst at the same time the said rod may be rotated
therein. 10, 10 are bolts that secure the clamp to the cross-head 3, 34. 11 is a
collar formed on the piston rod 1; to it is keyed a worm wheel 12 that gears with
a worm 13. This worm 13 is carried by a shaft 14 able to rotate in jaws or
bracket bearings 15, 15* formed in one with a plate 15 that is bolted to the
upper half 4 of the clamp. 16 is a toothed wheel with internal teeth keyed to the
shaft 14. 17 is a toothed wheel mounted loosely upon an eccentric boss 18 (see
Fig. 4) arranged to run loosely on the shaft 14. 19 is a ring fixed to the bracket
bearing 15 by bolts, one of which is shown at 20. This ring 19 is provided with
teeth at its inner circumference and the teeth of the wheel 17 are made wide
enough to gear with those of the fixed ring 19 as well as with those of the
concentric wheel 16. 21 is a ratchet wheel secured to or as in the example shown
formed in one with the eccentric boss 18; it is caused to be intermittently rotated
by means of a pawl 22 actuated from the connecting rod 23 as it vibrates, through
lever arms 24, 244, shaft 24³, and a rod 25, as will be readily understood from the
drawing. The number of teeth in the wheel 16 may be one or more in excess of
that in the fixed wheel 19. In this arrangement of gearing when the eccentric
wheel 17 is caused to rotate within and in gear with the fixed wheel 19 by

page_text: rotating the eccentric boss 18 by means of the ratchet wheel 21, the wheel 16
will, if it has one tooth in excess of that in the fixed ring 19, advance only one
tooth during each rotation of the said eccentric boss 18. If the number of teeth
in the wheel 16 be more than one in excess of that of the fixed ring 19, the
number of teeth it will advance for each rotation of the eccentric boss 18 will
equal the number it has in excess of the fixed wheel 19. By this arrangement
when the piston is working a slow intermittent rotation is imparted to it from the
connecting rod as it reciprocates.
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
I claim is:-
1. The combination with a cylinder and a piston arranged to reciprocate in such
cylinder, and provided with a connecting rod, of apparatus whereby as the piston
reciprocates it has imparted to it from the connecting rod also slow movement in a
rotary sense for the purpose mentioned.
2. The application and use for slowly rotating a reciprocating piston of apparatus
constructed, arranged, and operating substantially as hereinabove described with
reference to and shown in the drawings annexed.
Dated this 8th day of November 1886.
GEORGE M. PARK.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.