Improvements in Lifting Jacks for Road Vehicles.
Year: 1892

page_text: Date of Application, 31st Mar., 1892
Complete Specification Left, 28th Dec., 1892-Accepted, 28th Jan., 1893
PROVISIONAL SPECIFICATION.
Improvements in Lifting Jacks for Road Vehicles.
I, PETER WINTON, of 18 Broad Street, Camlachie, Lanarkshire, Agricultural
Implement Maker, do hereby declare the nature of my invention to be as
follows:-
=
This invention has reference to and comprises a new or improved portable
construction of lifting jacks for use in raising the wheel axles of carriages or other
road vehicles.
The improved jack consists of two vertical frames, a fixed or stationary one, and
a parallel sliding or movable frame.
Under one construction the fixed frame consists of two parallel vertical side
cheeks with an open space between, closed at the top end, and curved round and
formed at their lower end into a horizontal sole plate on which the whole is sup-
ported. The sliding or movable frame consists of a similar construction of vertical
side cheeks, and is formed with an angled standard at its upper end having a series
of steps or supports to suit for receiving different heights of carriage axles. The
upper end of the fixed frame and the lower end of the movable frame are formed
with horizontal projecting pins or studs passing through the spaces between the
cheeks, covered by washers and secured by pins at their outer ends, so as to guide
the sliding frame in its raising or lowering movements. A vertical loose rotating
pulley or roller is mounted on a centre stud between the cheeks of the movable
frame preferably near the middle of its length, and the under surface of this pulley
is acted upon by the curved or cam surface of a hand lever fulcrumed on a centre
pin between the cheeks of the fixed frame and having projecting studs on each
side to bear against the fixed frame in the lowest position of the hand lever.
When a carriage axle is to be lifted, the jack is put under it, with the axle placed
on one of the steps or grooves of the movable frame. The hand lever is then
depressed and its inner cam surface acts on the antifriction pulley or roller and
lifts the movable frame and axle to the height or position desired, and holds it
there;
while by raising the hand lever the, movable frame and axle is lowered by
the action of gravity to the position desired. In some cases a duplex lever action
may be employed to give increased lifting power.
Dated the 30th March 1892.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in Lifting Jacks for Road Vehicles.
I, PETER WINTON, of 18 Broad Street, Camlachie, Lanarkshire, Agricultural
Implement Maker, do hereby declare the nature of my invention, and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement in writing, that is to say :-
This invention has reference to and comprises a new or improved portable
construction of lifting jacks for use in raising the wheel axles of carriages or other
road vehicles.
The improved jack consists of two vertical frames, a fixed or stationary one, and
a parallel sliding or movable frame.
And in order that my said invention and the manner of performing or carrying
the same into practice may be properly understood, I have hereunto appended an
509371

page_text: explanatory sheet of drawings in which the same reference letters are used to
indicate corresponding parts in all-the figures where shown.
Figure 1 is a perspective elevation, and. Figure 2 a. side elevation, partly in
section, of a lifting jack for road vehicles as constructed in accordance with one
arrangement of my improvements. And Figures 3 and 4 are views corresponding
to Figures 1 and 2 of a slightly modified. arrangement.of my improved lifting jack.
Referring first to Figures 1 and 2.:-Under this construction the, fixed frame
consists of two parallel vertical side cheeks A, A, with an open space between,
closed at the top end A', and curved round and formed at their lower end into a
horizontal sole plate A on which the whole is supported. The sliding or movable
frame consists of a similar construction of vertical side cheeks B, B, and is formed
with an angled standard 13 at its upper end, having a series of steps or supports
to suit for receiving different heights of carriage axles. The upper end A, of the
fixed frame A and the lower end B' of the movable frame are formed with hori-
zontal projecting pins or studs c¹ passing through the spaces between the cheeks,
covered by washers and secured by pins at their outer end so as to guide the
sliding frame B in its raising or lowering movements. A vertical loose rotating
pulley or roller C, is mounted on a centre stud c, between the cheeks B, B, of the
movable frame, preferably near the middle of its length, and the under surface of
this pulley is acted upon by the curved or cam surface D₁ of a hand lever D,
fulcrumed on a centre pin D, between the cheeks A, A, of the fixed frame.
When a carriage axle is to be lifted the jack is put under it, with the axle
placed over one of the steps or grooves 6 most suitable of the movable frame B.
The hand lever D is then depressed and its inner cam surface D acts on the
antifriction pulley or roller C, and lifts the movable frame B, b, and axle to the
height or position desired, and holds it there, as shown in dotted lines Figure 2;
while by raising the hand lever D, the movable frame B and axle is lowered by the
action of gravity to the position desired..
In the modification shown in Figures 3 and 4, instead of the steps bibeing formed
on the upper part of the movable frame B, they are formed as rack teeth 6 along
the edges of the two cheeks B; and a portable rest is mounted to slide between
the cheeks B, B, and has a tooth 6 which rests on the teeth b of the rack to which
it is set. The wheel axles of the carriages are placed over the rest' and the
movable frame B, B, with the teeth b, raised or lowered substantially as described
in reference to Figures 1 and 2.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare, that what
I claim is
A lifting jack for road vehicles.provided with the combination of stationary and
movable vertical frames, steps or rack, movable pulley and operating hand lever
substantially as and for the purposes herein described in reference to and shown in
the accompanying drawings.
Dated the 27th December 1892