Improvements in or applicable to Churns.
Year: 1892

page_text: Date of Application, 28th Mar., 1892-Accepted. 30th Apr., 1892
COMPLETE SPECIFICATION.
Improvements in or applicable to Churns.
I, JOHN LLEWELLIN, of the firm of G. Llewellin and Son, of Haverfordwest,
in the County of Pembroke, Churn Manufacturers, 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 churns and consists in the provision of means whereby
the air-escape valve or vent may be operated during the rotation of the churn,
thereby avoiding the great trouble and inconvenience due to the stopping of the
churn as hitherto.
In carrying out my invention I advantageously employ a lever fixed upon the
barrel of the churn and one end of which is adapted to bear upon the escape-valve
whilst the other end is designed to run over a cain-surface.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawing, in which :-
Figures 1 and 2 are end and side elevations respectively of a portion of a churn
having my improvements applied thereto.
a indicates the framing of the churn, 6 the barrel which is mounted upon the
framing in the ordinary manner, and the air-escape valve which may be of ordinary
construction.
ونا
C
d indicates the lever through the medium of which the valve is depressed to
open the same. This lever is pivotted upon a bracket e secured to the barrel b
in such a manner that one end thereof is in contact with the stem of the air-
escape valve
the other end of the said lever carrying a rollery designed
during a certain part of the rotation of the barrel to run over a cam-surface /
to move the lever to depress the valve. This cam-surface, as shewn in the
drawing, is formed upon a block i which is hinged to an auxiliary frame ; carried
by the framing a.
It is obvious, when this block is in the position shewn in full lines in Figures 1
and 2, that, as the barrel rotates, the said roller will pass over the surface of
the said block and move the lever from the position shewn in dotted lines in
Figure 2 to that shewn in full lines, thereby depressing the valve to allow the
escape of air. When, however, the block is turned from the position shewn in
full lines in Figures 1 and 2 to the position indicated by the dotted lines in Figure 2
out of the path of the roller g, the valve will not be operated.
In practice I prefer to provide the roller g with an india-rubber surface so as to
minimise the noise which would be produced by the said roller striking the cam-
surface h.
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. The combination with a churn of means for operating the air-escape valve
thereon without stopping the churn, substantially as described.
2. In a churn the combination with the air-escape valve of a lever one end of
which bears upon the said valve and the other end of which is designed to
operate in combination with a cam-surface, substantially as, and for the purpose,
described.

page_text: 3. The improved means for operating the air-escape valve of a churn con-
structed substantially in the manner hereinbefore described and illustrated in the
accompanying drawing and operating as, and for the purpose, set forth.
Dated the 28th day of March 1892.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.