Improvements in Apparatus for Lifting by Compressed Air.
Year: 1896

page_text: Date of Application, 28th Nov., 1896
Complete Specification Left, 27th Aug., 1897-Accepted, 23rd Oct., 1897
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Lifting by Compressed Air.
We, JOHN ELIOT HOWARD, and JOHN CHARLES TAITE, both of 63 Queen
Victoria Street, in the City of London, do hereby declare the nature of this
invention to be as follows:-
In appliances for lifting by compressed air, such as jacks or hoists, it is usual
to connect the pressure by means of a flexible tube, the pressure being admitted
and controlled by a cock placed in close proximity to the jack or lift.
When the lifting operation is about to take place, air is admitted underneath
the piston which forces it in an upward direction carrying the weight with it.
It is obvious that if at the moment of lifting the flexible pipe suddenly becomes
disconnected severed or burst, there is great danger of a collapse which may prove
both detrimental to the machine and dangerous to those operating.
According to this invention this objection is overcome by placing a check or
non-return valve in the plug of the controlling cock the usual by-pass or small
passage in the plug being retained for lowering the weight.
Dated this 27th day of November 1896.
J. E. HOWARD.
J. C. TAITE.
Improvements in Apparatus for Lifting by Compressed Air.
We, JOHN ELIOT HOWARD, and JOHN CHARLES TAITE, both of 63 Queen
Victoria Street, in the City of London, 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:-
In appliances for lifting by compressed air such as jacks or hoists, it is usual to
connect the pressure by means of a flexible tube, the pressure being admitted and
controlled by a cock placed in close proximity to the jack or lift.
When the lifting operation is about to take place, air is admitted underneath
the piston which forces it in an upward direction, carrying the weight with it.
It is obvious that if at the moment of lifting the flexible pipe suddenly becomes
disconnected, severed or burst, there is great danger of a collapse, which may
prove both detrimental to the machine and dangerous to those operating.
According to this invention, this objection is overcome by placing a check or
non-return valve in the plug of the controlling cock, the usual by-pass or small
passage in the plug being retained for lowering the weight.
TD: 031

page_text: Figure 1 is a vertical central section of the cock, and Figure 2 is a horizontal
section on the line 2-2, Figure 1.
a, is the shell, b the connection with the supply, the connection with the
lifting apparatus, the plug, .e the cover, a spring between the plug
and cover, and g, a by-pass in the plug, which when the plug is turned from the
lifting position in which it is shown, to the lowering position, connects the
passage c with an opening in the shell.
j is a non-return valve in the plug d, it is pressed down by a spring k, placed
between it and the cover 7, m and n, are passages in the plug, which when the
plug is in the lifting position as shown, connect the passages b and c past the
valve j.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:
1. The combination with the controlling cock of a check or non-return valve
substantially as described.
2. Cocks for apparatus for lifting by compressed air substantially as described
and shown in the drawings.
Dated this 16th day of August 1897.
J. E. HOWARD.
J. C. TAITE.
By his Agents, Carpmael & Co.