Year: 1887

page_text: Date of Application, 9th Mar., 1887
Complete Left, 5th Dec., 1887
Complete Accepted, 6th Jan., 1888
I GEORGE GODFREY GIRLING Lenham near Maidstone Kent Petrean Stone
Manufacturer do hereby declare the nature of this invention to be as follows :—
Petrean Stone is an artificial Stone composed of Portland Cement Kentish Rag
and other hard Rocks. The conglomerate inass when in a plastic state is filled in
moulds and is subjected to the action of a "Jumping Machine," in order to make it
solid, and render facing unnecessary, which makes it very durable, and proof against
frost.
GEORGE GODFREY GIRLING.
James Stevenson,
Gray's Inn Chambers,
20, High Holborn, London, W.C.,
Agent for Applicant under Power
Dated 22nd November 1887.

page_text: COMPLETE SPECIFICATION.
Improvements in the Manufacture of Artificial Stone.
I, GEORGE GODFREY GIRLING Lenham near Maidstone, Kent Petrean Stone
Manufacturer, 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 my invention is to produce artificial stone in such a manner that
perfect cohesion takes place between the particles forming the resultant mass; the
moulded facing, plain or ornamental-being completed in one operation by the special
means forming the subject of my invention, thus rendering the artificial stone so
produced more durable, and proof against frost, than is attainable by the processes
hitherto usually adopted, and without necessitating any subsequent surfacing or
external finishing.
In order that my invention may be the better understood I have appended the
accompanying sheet of drawings in which Figure 1 represents a longitudinal section
of the apparatus employed in carrying out my invention, and Figure 2 is a sectional
elevation drawn on line A, B, Figure I; like letters of reference being used to denote
corresponding parts in the two views.
In Figure 1A and A¹ are the two end frames supporting the apparatus, and B one
of the cam shafts carrying the cams C and C³. The method of operating the cam
shafts B and B is shown more particularly in Figure 2, where a driving pinion D is
shown suspended between the two spur wheels D, D" which are keyed or otherwise
attached to the cam shafts B B¹. A pulley or other equivalent device is fitted to the
spindle of the driving pinion D for the purpose of transmitting motion to the
machine from a steam engine, manual or other suitable power. The cams C, C¹
mounted upon the cam shafts B, B₁ are formed of metal discs serrated at 6b the angle
of said serrations being oppositely arranged upon each pair of cams to suit the
direction of rotation of the respective cam shafts B, B. Within the angles a of the
end frames A A' is loosely fitted a platform or table E in such a manner as to allow of
its moving vertically. To the under surface of the platform or table E the links c c¹
are fitted corresponding with the cams C, C, carrying small rollers d d¹ for reducing
the friction consequent upon the impact of each tooth of the cams.
It is evident that when rotary motion is imparted to the driving pinion D the same
is transmitted with opposite directions of rotation to the spur wheels D¹ and D",
operating the cam shafts B, B¹.
The serrations bb upon the periphery of each cam cause a vibratory, vertical jumping
motion of the platform or table E which rests upon said cams by means of the links c
above mentioned, and drops back by the force of gravity after each tooth or serration b
has passed the rollers d, d, which are pivoted within the cheeks of the links cc'. The
moulds are placed upon the platform or table E, and filled with the necessary ingre-
dients, which are necessary for the production of artificial stone, such for instance
as Portland Cement and pulverized Kentish rag or other suitable material incorporated
therewith.

page_text: The vibratory or "jumping" movement of the platform or table E, has the effect
of causing the particles in the semi-fluid or plastic mixture to cohere and form a
composite mass of great density, and the facing of the mould is also reproduced with
absolute accuracy since the composite mass is forced into every crevice by means of
the constant "jumping" movement above described imparted to the mould by the
platform or table E. The perfect cohesion and density of the mass being uniform,
the "facing" thereof is complete when taken from the mould, and thus the subsequent
operation of trimming and finishing is thereby rendered unnecessary; also, artificial
stone produced in accordance with my invention is more durable, and less liable to
disintegration from the effects of frost or climatic changes than when made by the
processes at present in general use.
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
First: The means employed for and method of producing artificial stone
substantially as herein set forth.
Second: In the manufacture of artificial stone the method which I adopt for
imparting a vibratory "jumping" motion to the platform or table E supporting the
mould or moulds by means of cams or equivalents substantially as herein described
and shown in the accompanying drawings.
Dated this 2nd Ja
L1007
JAMES STEVENSON,
Gray's Inn Chambers,
20, High Holborn, W.C.,
Agent for Applicant.