Improvements in Coach-lifting Jacks.
Year: 1889

page_text: Date of Application, 13th July, 1889
Complete Specification Left, 12th Apr., 1890-Accepted, 28th June, 1890
Improvements in Coach-lifting Jacks.
I, JOHN MAOK, of 3 Bernard Terrace, in the City and County of Edinburgh,
Agricultural Implement Agent, do hereby declare the nature of my invention to be
as follows:
This Invention has reference to and comprises a new or improved construction
of coach builders' "Jack" for lifting carriages and their axles and wheels, for the
free turning of those, in cleaning and painting, or removing and replacing of these
for other purposes, and which will be more simple in construction easy in action,
and inexpensive than such "jacks" have been as heretofore constructed.
The nature and novelty of the invention and improvements consist as follows:-
Of a simple vertical standard of rather more than the height of the diameter of
the wheel, having a cruciform, or other base, bracketed, or stayed, to the bottom
of the standard sufficient for the, whole to stand freely on. The upper part of the
standard is formed with a slot in it or through it. for the arms or projections of a
raising and lowering catch block to slide securely in at the top and be retained in
the guide slot by sliding screw bolts or pins. Notched projections would be formed
at various heights of a few inches apart, at the top in front of this raising block
to take on to the axle or other part of the coach or vehicle to be lifted by it.
The lower end of this raising and lowering block, either with or without an anti-
friction roller in it, is made to rest on the top edge of an eccentric disc or cam
mounted to rotate in the slot below it, on an eccentric pin passed through the
slotted standard, and a lateral hand lever is fixed on this disc on the opposite side
of the standard to the raising block. In the lowest position of the block resting
on the eccentric cam, the hand lever would project upwards behind the block and
standard, with the handle projecting slightly outwards at the upper end for the hand
of the person drawing it out from the standard and turning it down, so as to turn
the cam or eccentric disc on its axis to raise the block to the height desired, and
the eccentric cam would pass the perpendicular line of the axial pin, and so be
retained there at the height desired, the eccentricity or scroll incline of the cam
being such that the weight lifted would not turn it to lower the raising block.
This "
jack" might either be made of hard wood with brass bushes and pins and
brass faced eccentric ring, or it might be made of malleable or cast iron and brass
fittings at the working parts, or other metal as desired, or it may be formed wholly
of metal.
Date 19th
TL 1000
W. R. M. THOMSON & Co.,
Agents.
COMPLETE SPECIFICATION.
Improvements in Coach-lifting Jacks.
I, JOHN MACK, of 3 Bernard Terrace, in the City and County of Edinburgh,
Agricultural Implement Maker, do hereby declare the nature of my said invention,
and in what manner the same is to he performed to be particularly described and
ascertained in and by the following statement in writing, reference being had to the
accompanying Sheet of Drawings, and to the letters and figures marked thereon, that
is to say:
This Invention has reference to and comprises a new or improved construction of
coach builders' "Jack" for lifting carriages and their axles and wheels, for the free

page_text: turning of these, in cleaning and painting, or removing and replacing of them for
other purposes, and which will be more simple in construction easy in action and
inexpensive than such "jacks" have been as heretofore constructed.
And in order that my said invention, and the manner of performing or carrying
the same into effect or practice may be properly understood, I have hereunto
appended an explanatory Sheet of Drawings, in which the same reference letters
are used to indicate corresponding parts in all the figures where shown. Figure 1
shows a perspective elevation of a coach lifting jack as constructed in accordance
with one arrangement of my improvements, with the front part of one of the guide
slides A2, as broken away to show the sliding feather B₁ of the raising and lowering
projecting gab or catch block B. Figure 2, shows a side elevation of a slightly
different modification of my improved Jack from that shown in Figure 1. Figure 3
shows an inside view of one of the sides A2 of the frame as removed from Figure 2,
to show the internal construction of the side frames A2, A2. Figure 4 shows a side
and edge view of the eccentric lever C, (1, as detached from Figure 2. And
Figure 5 is a side elevation and transverse section of the raising and lowering
projecting gab B, as detached from Figure 2.
Referring to Figures 1 and 2 of these Drawings, the improvements consist as
follows Of a simple vertical standard formed preferably of two side frames A2, A²,
bolted together at their upper and lower ends at A", A, at some little distance
apart leaving a parallel space A between them, and having their lower ends screwed
at A, to cruciform, or equivalent, supporting feet at the bottom of the standard
frame A2 A2, sufficient for the whole to stand steadily and freely on.
The upper
part of the standard is formed with the slot A' A' in it or through it between the
side frames A2 A2, for the slide projection B¹ of a raising and lowering catch gab
or slide block B to slide securely in at the top and be retained in the guide slot A¹,
by the sliding screw bolts or pins B". Notched projections are formed at B2, B³, Bª,
at various heights of a few inches apart, at the top in front of this raising block B
to take on to the axle or other part of the coach or vehicle to be lifted by it.
The lower end of this raising and lowering block B, either with or without an
antifriction roller in it, is made to rest on the top edge of an eccentric disc C, or
it might be a cam, mounted to rotate in the slot A¹ below it, on an eccentric pin c
passed through one of the holes u of the slotted side frames A2 A2, and a lateral
hand lever C, is formed or fixed on this disc Con the opposite side of the standard
to the projecting raising block B. The fulcrum pin c for being inserted into any
of the holos a of the standards is preferably attached to the free end of a light
chain secured at its other end to the handle C¹; but this pin and chain can
be dispensed with in the modification shown in Figure 2, in favor of a fixed fulcrum
on the lever, as hereinafter described. In the lowest position of the block B, resting
on the eccentric disc C, the hand lever C¹ would project upwards behind the block B
and standard A2, as shown in Figures 1 and 2, with the handle projecting
slightly outwards at the upper end for the hand of the person drawing it out from
the standard and turning it down so as to turn the eccentric disc Con its axis c
to raise the block B, to the height desired, before the eccentric C would pass the
perpendicular line of the axial fulcrum pin c and so be retained there at the height
desired, as indicated in dotted lines in Figure 2, the eccentricity or scroll incline
of the disc C being such that the weight lifted would not turn it to lower the
raising block B from its raised position. A fixed pin c¹ might be formed or secured
in the handle ("in, such a position that when the handle C is turned down this
pin would come against the standard A2 and prevent the eccentric and handle
falling below the dotted-in position in Figure 2. In the modification of my improved
coach lifting Jack shown in Figures 1 and 2, the fulcrum pin c of tho raising and
lowering eccentric disc may be shifted into the different holes a of the standard
frame A2, A2, to give different lengths of action for raising the catch block B.
But by the further improvements shown in Figures 2 to 5 the fulcrum of the
eccentric disc C, is formed by two studs c², c², on its opposite sides, which take
into slotted bearings c³ formed by grooves on the inside of the two standard

page_text: frames A2, A2, as seen more particularly in Figure 3, and by raising the eccentric C
and its lever C¹, so as to lift its fulcrum studs c² out of the lateral bearing slots c³
into a long vertical slot c at the opposite side of the frames A2, A2, the lever may
be raised or lowered and drawn laterally into any of these bearing slots c³ desired
to suit for the eccentric C and its acting block B lifting the axle or article to the
height desired to be raised. In this arrangement shown in Figures 2 to 5, the
lifting catch block B, is guided by feathers Figure 5, or it might be pins or
rollers 6 Figure 2, to rise parallelly and vertically in the grooves or sides of the
frames A2 A2, or follow the motion of the eccentric C, which in this case is pre-
ferred to be formed with a central feather rim at C² working into a corresponding
groove b, on the under acting edge of the raising block B, to maintain both steadily
in action while the block B is rising and falling with and over the eccentric C.
This improved coach lifting jack as shown is made of cast-iron in separate parts
and bolted together as described, but it might be made of malleable iron, or of
malleable cast-iron, or of steel, or in some cases it might be made of hard-wood with
brass bushes and pins and brass faces at the eccentric ring, and working parts.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what 1
claim is.-
First. The constructing and use of a coach-lifting jack with an eccentric disc and
lever, and otherwise substantially as herein described, in reference to and shown in
the accompanying Drawings.
Second. In a coach-lifting jack the use of an eccentric disc or equivalent cam
and lever mechanical action for actuating the lifting catch block, substantially as and
in the manner herein described, in reference to and shown in the accompanying
Drawings.
13
1
11:1
A
1 1000
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.