Improvements in Lifting-jacks.
Year: 1897

page_text: Date of Application, 29th Oct., 1897
Complete Specification Left, 10th Jan., 1898-Accepted, 23rd Apr., 1898
PROVISIONAL SPECIFICATION.
Improvements in Lifting-jacks.
We, WILLIAM HAYWOOD, of the Sewage Works, Brentford, in the County of
Middlesex, Engineer, and WILLIAM RICHMOND WARLOW, of Nolton House,
Windmill Road, Brentford, in the county aforesaid, Surveyor, do hereby declare
the nature of this invention to be as follows:-
This invention relates to an improved form of jack suitable for lifting manhole
covers and the like, and it consists essentially of a suitable stand carrying at
its upper end a box in which is mounted a vertical spindle supported by a step
bearing screwed into the bottom of the said box and capable of being adjusted
therein and provided with a lock nut or other suitable means for fixing
position.
in
This spindle has shoulders or collars formed on it which are adapted to fit
in a recess in the top of the box, the said recesses being closed by an insertion
ring held in place by a cap threaded on to or into the top of the box, thereby
retaining the spindle in the box and preventing it being lifted out while allowing
it free rotative movement therein. The top of this spindle carries a bracket in
which is pivotted a lever of the first kind. One end of this lever is shaped as a
handle and the other end has an eye to which is attached in any suitable manner
a short length of chain terminating in a hook or its equivalent adapted to engage
with two short lengths of chain each carrying T-shaped hooks or their equivalents.
adapted to engage with the lifting holes provided in the manhole cover or the
like.
With this jack a manhole cover or the like can be readily lifted from its seating,
dropped on to the ground and again lifted and reseated by one man, as after the
cover is lifted clear of its seating the vertical pivot allows it to be rotated
to a suitable position for it to be dropped until it is ready to be placed back in
its seating.
The pivot of the lever and the hole for receiving the lifting chains are so
arranged that they are interchangeable whereby the lever may be converted into
one of the second kind.

page_text: We, WILLIAM HAYWOOD, of the Sewage Works, Brentford, in the County of
Middlesex, Engineer, and WILLIAM RICHMOND WARLOW, of Nolton House,
Windmill Road, Brentford, in the county aforesaid, Surveyor, 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:-
This invention relates to an improved form of jack suitable for lifting manhole
covers and the like.
In the accompanying drawing:-
Figure 1 is a view in side elevation showing one form this invention may
assume.
Figure 2 is a similar view showing a modification, and
Figure 3 is a broken view in sectional elevation on an enlarged scale-showing
a detail of construction.
Throughout the views similar parts are marked with like letters of reference.
The improved jack consists of a tripod or other suitably shaped stand A carry-
ing at its upper end a box B in which is mounted a vertical spindle C supported
by a step bearing b screwed into the bottom of the box B and capable of being
adjusted therein and provided with a lock nut b¹ or other suitable means for
fixing it in position.
The spindle C has shoulders or collars c c formed on it which are adapted to
fit in a recess 63 in the top of the box B, the said recesses being closed by an
insertion ring D held in place by a cap E threaded on to the top of the box B
thereby retaining the spindle C in the box and preventing it being lifted out
while allowing it free rotative movement therein. The top of the spindle C carries
a bracket F to which is pivotted a lever G one end of which is shaped as a handle.
The lever has two eyes or holes g and g¹ in it one located at the opposite end to
the handle and the other at a convenient distance therefrom, The lever G is
pivotted to the bracket F by either of the eyes or holes or g¹ as it
is desired that it shall operate as a lever of the first order as shown
in Figure 1 or of the second order as
To
shown in Figure 2.
one or' other of the eyes or holes 9 g in the lever G as the case
may be is attached in any suitable manner a short length of chain H terminating
in a hook h or its equivalent adapted to engage with two short lengths of chain
or with two links J, J, each carrying a T-shaped hook or its equivalent adapted
to engage with the lifting holes provided in the manhole cover X or the like.
With this jack a manhole cover or the like can be readily lifted from its seating,
dropped on to the ground and again lifted and re-seated by one man, as after the
cover is lified clear of its seating the vertical pivot allows it to be rotated to a
suitable position for it to be dropped until it is ready to be placed back in its
seating.
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 of parts herein described and illustrated by the accompany-
ing drawing forming an improved lifting-jack.
(2) A lifting-jack consisting essentially of a stand such as A, of a box such as B
carried by the said stand, of a spindle such as C mounted in the box B carried by
the stand A so that it is free to rotate with respect to the said stand, of a lever such

page_text: as G pivotted to the top of the spindle C and of chains and links for connecting
the lever G to the manhole cover or the like, as set forth.
Dated this 7th day of January 1898.
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicants.