IMPROVEMENTS IN MACHINERY FOR COMMUNICATING MOTION TO AND TRANSMITTING MOTION FROM RECIPRO- CATING RODS
Year: 1860

page_text: LETTERS PATENT to Stephen Holman, of Lewisham, in the County of
Kent, Engineer, for the Invention of "IMPROVEMENTS IN MACHINERY
FOR COMMUNICATING MOTION TO AND TRANSMITTING MOTION FROM RECIPRO-
CATING RODS."
Sealed the 24th May 1861, and dated the 7th December 1860.
PROVISIONAL SPECIFICATION left by the said Stephen Holman at
the Office of the Commissioners of Patents, with his Petition, on the
7th December 1860.
I, STEPHEN HOLMAN, of Lewisham, in the County of Kent, Engineer, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
MACHINERY FOR COMMUNICATING MOTION TO AND TRANSMITTING MOTION FROM
RECIPROCATING RODS," to be as follows, viz. :-
A mechanical arrangement for communicating motion to piston and bucket
and other reciprocating rods. Also of transmitting motion from reciprocating
rods, without the use of vibrating slings, & generally without the use of
parallel guide rods; the rod is provided with a loop or cap which is attached
to it by means of a screw or any other convenient mode of fastening; the said
cap is made of a suitable shape to receive a roller (made of iron or other
material) & to permit the roller when in motion to travel in a parallel line

page_text: transversely to the direction of the length of the rod and loop; the roller is
adjusted to a lever which works on a fixed pin. When the lever is put in
motion that part to which the roller is adjusted describes an arc, which causes
the roller to travel in a parallel line a distance equal to the versed sine of the
arc. This arrangement permits a greater length of traverse of the reciprocating
rod than the distance from the fulcrum to the pin on which the roller revolves
without the use of vibrating slings, standards, or guide rods, it dispenses with
friction by having a direct purchase at all points and is produced at less cost.
I propose to adapt the dimensions & shape of the roller and loop, or cap to
suit various purposes and requirements. I here note that the traverse of the
roller is not affected by its diameter, it is determined by the lengths of the
lever & the stroke.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Stephen Holman in the Great Seal Patent Office, on the
5th June 1861.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, STEPHEN
HOLMAN, of Lewisham, in the County of Kent, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the 7th day of December, in the year of our Lord
One thousand eight hundred and sixty, in the twenty-forth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Stephen Holman, Her special licence that I, the said Stephen
Holman, my executors, administrators, and assigns, or such others as I the
said Stephen Holman, my executors, administrators, and assigns, should at
any time agree with, and no others, from time to time and at all times
thereafter during the term therein expressed, should and lawfully might
make, use, exercise, and vend, within the United Kingdom of Great Britain
and Ireland, the Channel Islands, and Isle of Man, an Invention for
"IMPROVEMENTS IN MACHINERY FOR COMMUNICATING MOTION TO AND TRANSMITTING
MOTION FROM RECIPROCATING RODS," upon the condition (amongst others) that
I, the said Stephen Holman, my executors, or administrators by an instru-
ment in writing under my, or their, or one of their hands and seals, should
particularly describe and ascertain the nature of the said Invention, and in
what manner the same was to be performed, and cause the same to be filed
in the Great Seal Patent Office within six calendar months next and in-
mediately after the date of the said Letters Patent.

page_text: NOW KNOW YE, that I, the said Stephen Holman, do hereby declare
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement, reference being had to the Drawing hereunto annexed,
and to the letters marked thereon (that 'is to say) :-
This Invention relates to a mechanical arrangement for communicating
motion to piston and bucket and, other rods; also for transmitting motion
from reciprocating rods without the use of vibrating slings or fulcrums, and
generally without the use of extended guide rods.
To attain this end the rod is provided with a cap, which is attached to
it by means of a screw or any other convenient mode of fastening; the said
cap is made of a suitable shape and size to receive a roller made of iron or
other suitable material, and made of suitable dimensions to permit the reci-
procating rod to traverse a length greater than the distance from the fixed
fulcrum pin to the pin on which the roller revolves; and also to permit the
roller when in motion to travel in a parallel line, transversely to the direction
of the rod. The roller is adjusted to a lever which works on a pin fixed in
any convenient position, and when the lever is put in motion, that part to
which the roller is adjusted describes an arc, and the roller by its bearing on
the bottom internal surface of the cap in its downward movement, and on the
top internal surface in its upward movement is caused to revolve whilst it.
travels in a parallel line a distance equal to the versed sine of the arc.
In the accompanying Drawing, Fig. 1 represents a front view of one kind
of pump to which this Invention is applicable (it is also applicable to other
kinds of pumps and machines.)
Fig. 2 is a side section of the cap, shewing the roller in its position, together
with the pin on which it revolves, and the section of jaw of lever to which the
roller pin is fixed.
I propose to adapt the dimensions and shape of the roller and cape to suit
various purposes and requirements. I here note that the traverse of the
roller is not affected by its diameter; it is determined by its distance from the
fixed fulcrum pin, and the length of stroke.
The action is as follows:-When motion is given to the lever A the roller
B describes an arc, and traverses a plane line simultaneously, its extreme
bearning distance on the cap being when the centres of the roller and fulcrum
pins are at a relative angle of 90 degrees with the reciprocating rod. At this
point the roller reverses both its rotary and traversing motion, and assumes
the same position at the limits of the up and down stroke of the rod.
I claim the construction and arrangement as above set forth, or any mere

page_text: modification thereof, and particularly in its application to pumps of various
construction, whereby I am enabled to effect the parallel traverse of the rod
at a comparatively small cost.
In witness whereof, I, the said Stephen Holman, have hereunto set my
hand and seal, the Fifth day of June, in the year of our Lord One 5
thousand eight hundred and sixty-one.
STEPHEN HOLMAN. (L.B.)