An Improvement connected with Hydraulic Lifting Jacks and Hydraulic Rams.
Year: 1892

page_text: Date of Application, 3rd Sept., 1892
Complete Specification Left, 5th June. 1893-Accepted, 15th July, 1893
PROVISIONAL SPECIFICATION.
An Improvement connected with Hydraulic Lifting Jacks and
Hydraulic Rams.
I WILLIAM HUTTON of 12 Montague Place, Russell Square, in the County of
London, Gentleman, do hereby declare the nature of this invention which has
been communicated to me from abroad by Matthew Brown of Albyn Villa, Plein
Street, Woodstock, near Cape Town, Cape of Good Hope, Coach Builder, to be
as follows:
This invention relates to hydraulic lifting jacks and has for object to prevent the
ram receding after pressure is put on for lifting purposes such as when said pressure
has to be retained..
In hydraulic jacks at present constructed there are no means adopted to retain
the ram in the required position after the lift has been effected it being well
known that however good the metal of the cylinder there is an oozing through
the pores or an escape around the cup leathers or at the taps so that the pressure
becomes reduced.
This invention consists in forming step like notches on the rain or on the cylinder
and in attaching to the movable part one or more spring catches to engage in the
notches during the lifting to retain the "lifter" at the height. The catches have
handles by which they can readily be withdrawn and occupy a position alongside so
as not to interfere with the jack being moved from place to place, the springs
being so placed or arranged that the catches can be kept open or closed.
Dated this 3rd day of September 1892.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said W. Hutton.
COMPLETE SPECIFICATION.
An Improvement connected with Hydraulic Lifting Jacks and
Hydraulic Rams.
I, WILLIAM HUTTON, of 12 Montague Place, Russell Square, in the County of
London, Gentleman, do hereby declare the nature of this invention which has
been communicated to me from abroad by Matthew Brown, of Albyn Villa, Plein
Street, Woodstock near Cape Town, Cape of Good Hope, Coach Builder, and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement :-
This invention relates to hydraulic lifting jacks, and has for object to prevent
the ram receding after pressure is put on for lifting purposes, such as when
said pressure has to be retained.
In hydraulic jacks at present constructed there are no means adopted to retain
the ram in the required position after the lift has been effected, it being well
known that however good the metal of the cylinder there is an oozing through
the pores, or an escape around the cup leathers, or at the taps, so that the pressure
becomes reduced.
This invention consists in forming step like notches on the ram, or on the
cylinder and in attaching to the movable part one or more spring catches to engage
in the notches during the lifting to retain the "lifter" at the height. The catches
have handles by which they can readily be withdrawn and occupy a position.
alongside, so as not to interfere with the jack being moved from place to place,

page_text: the springs being so placed, or arranged that the catches can be kept open
or closed.
The annexed drawings illustrate the invention,
Figure 1 being a part sectional side elevation of a hydraulic jack showing the
spring catches engaged in the notches to prevent the downward movement of the
cylinder;
Figure 2 an end elevation of same, and
Figure 3 a part sectional side elevation, showing the spring catches withdrawn to
allow free downward movement of the cylinder.
A represents a ram fixed upon the ordinary traversing screw base B, and
carrying the sliding cylinder C. D, D, are notches arranged in parallel order on
the ram A, as shown in Figure 1, (or in alternate order as shown in Figure 3) for
engaging the spring catches E, E, when the handles, or cam levers F, F, are folded
backwards close against the sides of the cylinder C, to prevent the cylinder receding
after pressure is put on for lifting purposes. The handles F, F, are pivoted
at G, G, to springs H, H, attached at I, I, to the cylinder C, and by pulling down
the handles to the position shown in Figure 3, the shoulders J, J, formed by their
forked pivoted ends turn against the face of the cylinder and act as cams to withdraw
the spring catches E, E, from the notches D, D, for allowing free downward movement
of the cylinder C ou the ram A.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The improvement connected with hydraulic lifting jacks and hydraulic rams
hereinbefore described, and substantially as shown in the annexed drawings.
2. Forming step like notches on the ram, or on the cylinder of hydraulic lifting
jacks, or rams, and attaching to the movable, part one or more springs catches to
engage in said notches in combination with pivoted cam levers in the manner
and for the purpose described and substantially as shown in the annexed drawings.
The 5th day of L. 1902
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said William Hutton.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said William Hutton.