An Improved Carriage Jack.
Year: 1893

page_text: Date of Application, 6th Nov., 1893
Complete Specification Left, 27th Jan., 1894-Accepted, 10th Mar., 1894
PROVISIONAL SPECIFICATION.
An Improved Carriage Jack.
I, CHARLES DAWSON, Coachman, The Lodge, Abbeydale House, Sheffield, do
hereby declare the nature of my said invention to be as follows
-
The object of my invention is to simplify the construction and reduce the cost of
a carriage jack which may be employed for raising the axle and wheels of carriages
and the like vehicles in order that they may be repaired or cleaned, such raising
being effected by one operation and I effect this in the following manner.
I construct my improved jack in three principal parts, the first which I call the
rack bar I construct by preference of wood strengthened by side fillets of bead iron,
and for a certain distance along the front of this wooden rack bar I form notches at
convenient distances apart to suit vehicles of different sized wheels. The upper end
of this rack bar I form with a slot into which I fit the short end of a lever bar
which forms the second part of my improved jack and which I secure to the rack
bar by means of a pin or bolt. This lever bar I secure to and carry on to the back
strut or third portion of my improved jack, this back strut I construct by preference
of two wrought iron tubes secured together in the form of the letter A, the top end
of which carries the fulcrum pin of the lever bar previously referred to, the two legs
of the strut being kept apart and stayed together by means of a cross bar made of
tube or otherwise so that the back strut and the lever bar together form the support
for the rack bar.
The action of my improved jack is as follows, I place the rack bar under the axle
of the vehicle to be lifted at an angle so as to bring one of the notches on the rack
close up to the underside of the axle and midway between the two wheels I then
raise the lever bar and bring the back struts into a vertical or almost vertical
position. When so placed I press the long end of the lever bar downwards until it
touches the cross stay between the strut bars to which, when necessary, I secure
it with a suitable clip or catch provided for the purpose.
When in this position the
lever bar and the strut bars are nearly parallel with each other, but the strut is no
longer in a vertical position having been forced by the action of the lever bar
towards the rack bar, before this position could be reached however the rack bar
has been raised by the combined action of the lever bar-and the strut sufficiently to
raise the wheels of the vehicle clear from the ground.
It will thus be seen that the action is of a compound nature as on depressing the
lever bar the pin at the top end of the back strut forms the fulcrum by which the
effect of the leverage is brought to bear upon the rack bar and the pin in the rack
bar forms the fulcrum for the same lever in changing the angle of the strut so that
the rack, bar is really raised by the compound movements of the lever bar and
strut.
Dated this 17th day of June 1893.
R. HEBER KADFORD,
Agent for the Applicant.

page_text: An Improved Carriage Jack.
I, CHARLES DAWSON, Coachman, The Lodge, Abbeydale House, Sheffield,
in the County of York, do hereby declare the nature of my said invention and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement :-
The object of my invention is to simplify the construction and reduce the cost of
a carriage jack which may be employed for raising the axle and wheels of carriages
and the like vehicles in order that they may be repaired or cleaned, such raising
being effected by one operation and I effect this in the following manner,
I construct my improved jack in three priucipal parts, the first which I call the
rack bar, construct by preference of wood strengthened by side fillets of bead iron,
and for a certain distance along the front of this wooden rack bar I form notches at
convenient distances apart to suit vehicles of different sized wheels. The upper end
of this rack bar I form with a slot or double eye into which I fit the short end of a
lever bar which forms the second part of my improved jack and which I secure to
the rack bar by means of a pin or bolt. This lever bar I secure to and carry on to
the back strut or third portion of my improved jack, this back strut I construct by
preference of two wrought iron tubes secured together in the form of the letter A,
the top end of which carries the fulcrum pin of the lever bar previously referred to,
the two legs of the strut being kept apart and stayed together by means of a cross
bar made of tube or otherwise so that the back strut and the lever bar together form
the support for the rack bar.
The action of my improved jack is as follows,-I place the rack bar under the
axle of the vehicle to be lifted at an angle so as to bring one of the notches on the
rack close up to the underside of the axle and midway between the two wheels,
I then raise the lever bar and bring the back struts into a vertical or almost vertical
position. When so placed I press the long end of the lever bar downwards until it
touches the cross stay between the strut bars to which, when necessary, I secure
it with a suitable clip or catch provided for the purpose. When in this position
the lever bar and the strut bars are nearly parallel with each other, but the strut
is no longer in a vertical position having been drawn by the action of the lever bar
towards the rack bar, before this position could be reached however, the rack bar
has been raised by the combined action of the lever bar and the strut sufficiently to
raise the wheels of the vehicle clear from the ground.
It will thus be seen that the action is of a compound nature as on depressing the
lever bar the pin at the top end of the back strut forms the fulcrum by which
the effect of the leverage is brought to bear upon the rack bar and the pin in the
rack bar forms the fulcrum for the same lever in changing the angle of the strut, so
that the rack bar is really raised by the compound movements of the lever bar
and strut.
The nature of my invention will be better understood on reference to the
accompanying sheet of drawings in which,
Fig. 1, is a side elevation of my improved jack placed in position under the axle
of a vehicle ready for raising the same from the ground.
Fig. 2, is a similar elevation shewing the position of the jack when the lever bar
has been depressed so as to lie parallel or nearly parallel with the back strut
in which position the wheels of the vehicle have been raised clear from the ground.
Fig. 3 is an end elevation of the jack with the lever bar depressed.
The same letters refer to similar parts throughout the several views―
a, is the rack bar.
b, are the side fillets of bead iron or steel sometimes used for strengthening
or stiffening the rack bar when the rack bar is made of wood.

page_text: c, c, are the notches on the rack bar.
d, is the slot or double eye formed in the upper end of the rack bar.
e, is the lever.
el, being the short end of the same.
f, is the pin or bolt connecting the short end of the lever bar to the rack bar.
9, 9,
is a back strut or struts.
h, is the fulcrum pin connecting the lever bar to the back strut or struts.
i, is a cross bar or stay by means of which the legs of the back strut are kept
apart.
j, is the axle of the vehicle to be raised or lifted.
k, is a clip sometimes used for securing the lever, e, to the cross bar, i.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed I declare that what I
claim is,
1. In a carriage jack the arrangement and combination of parts and appliances
comprising the rack bar, a, the lever bar e, and the back struts 9, 9, connected
together by the fulcrum pins f, and h, by the compound movement of which the axle
of a vehicle may be sufficiently raised for the wheels to revolve clear of the
ground, in the manner and for the purposes substantially as herein described and
illustrated.
Dated this 26th day of January 1894.
R. HEBER RADFORD,
Agent for the Applicant.