Improvements in and connected with Pestle and Mortar Machines.
Year: 1895

page_text: Date of Application, 12th June, 1895
Complete Specification Left, 12th Mar., 1896--Accepted, 18th Apr., 1896
Improvements in and connected with Pestle and Mortar Machines..
I EDWIN FREDERIC GOODALL of 29 Newstead Road Liverpool in the County
of Lancaster, Mechanical Engineer do hereby declare the nature of this invention
to be as follows:-
My invention relates to the class of machines described in Specification No. 11183.
of 1887, for which Letters Patent has been granted unto me.
My said improvements refer more particularly to the mechanism for obtaining
and determining the differentiating motion of the pestle which I now construct in
the following manner.
The pestle shaft passes through a diametrical slot in the body of a bevel wheel
placed horizontally at a suitable distance above the mortar and the radial
distance of the pestle shaft from the axis of the bevel wheel is varied while
rotating by means of a connecting rod or shackle which engages a crank pin.
carried by a small worm wheel contained within the body of the said bevel wheel
and which is caused to rotate slowly upon its axis by being carried around-by the
said bevel wheel-in gear with a screw thread formed within the socket part which
supports the bevel wheel aforesaid.
A further improvement consists in the grooving of the working surfaces of both.
the pestle and mortar which I have found to be of great value when grinding and
pulverizing certain substances. The said grooves are arranged either radially or
spirally in relation to the axes of both pestle and mortar and may be of saw-tooth,.
V or other suitable shape.
Dated this 11th dan of Tune 1905
Improvements in and connected with Pestle and Mortar Machines.
I, EDWIN FREDERIC GOODALL of 29 Newstead Road Liverpool in the County
of Lancaster Mechanical 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 :-
My invention relates to certain improvements in the class of machines described
in Specification No. 11183 of 1887 for which Letters Patent has been granted
unto me.
My said improvements relate more particularly to the mechanism for obtaining
and determining the differentiating motion of the pestle which I now construct in
the following manner, that is to say:-
The pestle shaft passes through a diametrical slot in the body of a bevel wheel
placed horizontally at a suitable distance above the mortar and the radial distance
of the pestle shaft from the axis of the said bevel wheel is varied while rotating
by means of a connecting-rod or "shackle" which engages a crank pin carried by
a small worm wheel contained within the body of the bevel wheel aforesaid and
which is caused to rotate slowly about its axis by being carried around by the bevel

page_text: wheel in gear with a screw thread formed within the socket part which supports
the said bevel wheel.
A further improvement in the machine as aforesaid consists in forming grooves
in or ridges upon the working surfaces of both pestle and mortar which I have
found to be of great value when grinding and pulverizing certain substances, the
said grooves being arranged either radially or spirally in relation to the axis of both
pestle and mortar and the said grooves or ridges may be of saw-tooth, V, or other
suitable shape.
Figures 1 and 2 upon the sheet of drawings hereunto appended represent a plan
(on line) and sectional clevation respectively of my said improvements in which
A is the pestle shaft, B the "shackle" or connecting rod, C the worm wheel gearing
into the internal screw thread D cut inside the socket piece E. F and G are the
pestle and mortar having grooves or ridges formed upon their surfaces as shewn,
the size and forin thereof being required to be varied to suit the several classes of
work for which the machines are employed.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
:-
1. In pestle and mortar machines the method of obtaining and determining a
differentiating motion of the pestle by means of the connecting rod B and
worm wheel C gearing into the screw thread D,.substantially as herein shewn and
described.
2. In pestle and mortar machines the formation of grooves or ridges upon the
rounded end of pestle and inner surface of mortar of any size form and arrange-
ment for the purpose of intensifying the grinding action of the said pestle and
mortar.
Dated this 9th day of March 1896.
EDWIN FREDERIC GOODALL.