Improvements in or in connection with Cranes.
Year: 1894

page_text: Date of Application, 2nd June, 1894
nifination
Loft 20th Feb 1895-Accepted. 30th Mar., 1895
PROVISIONAL SPECIFICATION.
Improvements in or in connection with Cranes.
The
I WILLIAM PURDY of 26 Azalia Street Beckett Street Leeds in the County
of York Builder do hereby declare the nature of this invention to be as follows :—
My invention refers to that class of cranes generally used by builders and
contractors, but is more or less applicable to most descriptions of cranes.
object of my invention is to obviate the disadvantage which attends the use of
builders hand cranes, in that as at present constructed they can only be swung or
slewed round part of a circle; necessitating in most erections the use of two or
three cranes, where one constructed according to my invention would suffice.
A crane constructed according to my invention is mounted on two sets of parallel
timbers or sleepers, the one set at right angles to the other, the ends of the timbers
projecting so far that they can be built over or weighted to secure stability during
working operations. The timbers are secured together at the corners of the square
(formed by them) by strong bolts. On the same square is mounted a metal ring
frame in one or more pieces. An approximately square or rectangular groove or
race is formed by providing this ring frame with top and bottom flanges, directed
outwards and inclined upwards, or directed inwards and inclined downwards.
A mid timber resting at its ends on two of the sides of the square (together with
two short timbers at right angles to the same) supports a foundation plate
preferably in the form of a cross, and having the king post pin or pivot fixed to the
centre boss of this casting; which for the sake of distinction is herein termed the
king post foundation. The bottom of the king post is supported on a casting formed
with a socket fitting on the aforesaid pin or pivot, and which likewise for the sake
of distinction may be termed the king post socket piece. From this socket piece,
one or two horizontal timbers, (hereinafter termed the tail guy arms), pass outwards
to the ring frame, on the opposite side of the king post to that on which the jib is
situated. To the ends of these timbers are attached brackets, which carry runners
or rollers working in the groove or race of the ring frame, and to these brackets
are attached the rods of the tail guy coming from the top of the king post. Similar
timbers are or may be provided at right angles to the tail guy arm, having brackets
carrying runners or rollers also working in the said groove or race, and connected
at their outer ends to side guys from the top of the king post.
The ring frame being securely bolted to the sleeper beams, the strain on the tail
is taken by the top flange of the groove or race, thus preventing the upsetting
of the crane.
guy
Immediately below projecting radially in the direction of the jib, I provide a
fourth set of radial timbers carrying runners working in the before mentioned groove
Το
or race. These timbers for the sake of distinction may be called the jib arm.
the outer end of the jib arm, or to the brackets on the same carrying the rollers or
runners, are secured the lower ends of a pair of channel (or Hiron) struts, attached
at their upper ends to the sides of the king post. The jib moves up and down
(radially) between these iron struts. The bottom flange of the ring frame by means
of the rollers at the end of the jib arm receives the thrust from the side struts.
My invention further comprises means for preventing the fall of the jib in case
of rupture of the jib chain. For this purpose I provide a rack (or racks), which

page_text: are fixed to the inner sides of the channel iron side struts, and a catch bar or bars
binged in the direction of their length to and one on each side of the jib. By
means of rods and levers attached to the hinged shafts of the catch bars, these
latter may be pushed out so as to engage with the rack or racks, or withdrawn to
clear them. In their normal position the catch bars stand out, so as to engage with
the racks. The above arangement may be modified by attaching the rack to the
jib, and making the rack moveable to follow the jib, whilst a catch plate or plates
attached to the side struts is made moveable in the direction to engage or disengage
with the racks.
Dated this 21st May 1904
Improvements in or in connection with Cranes.
I WILLIAM PURDY of 26 Azalia Street, Beckett Street Leeds in the County
of York Builder 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 :-
My invention refers to that class of cranes generally used by builders, but is
more or less applicable to most descriptions of cranes. The object of my invention
is to obviate the disadvantage which attends the use of builders' hand cranes, in
that as at present constructed they can only be swung or slewed round part of a
circle, necessitating in most (building) erections the use of two or three cranes,
where one constructed according to my invention would suffice.
A crane constructed in accordance with my invention is mounted on two sets of
parallel timbers or sleepers, the one set at right angles to the other, the ends of the
timbers projecting so far that they can be built over or weighted to secure stability
during working operations. The timbers are secured together at the corners of the
square (formed by them) by strong bolts. On the same square is mounted a metal
ring frame in one or more pieces. An approximately square or rectangular groove
or race is formed by providing this ring frame with top and bottom flanges, directed
outwards and inclined upwards, or directed inwards and inclined downwards.
A mid timber connected at its ends with the centre of two opposite sides of the
square, (together with two short timbers at right angles to the same), supports a
foundation plate preferably in the form of a cross, and having the king. post pin or
pivot fixed to the centre boss of this casting, which for the sake of distinction is
herein termed the king post foundation. The bottom of the king post is provided
with a casting formed with a socket fitting on the aforesaid pin or pivot, and which
likewise for the sake of distinction may be termed the king post socket piece. My
invention is not essentially altered if the above positions of the pin and socket
respectively are reversed.
From this socket piece one or two horizontal timbers, (hereinafter termed the
tail guy arms), pass outwards to the ring frame on the opposite side of the king
post to that on which the jib is situated. To the ends of these timbers are attached
brackets carrying runners, working in the groove or race of the ring frame, and to
these brackets or the ends of the arms are attached the tail guy rods coming from
the top of the king post. Similar timbers are or may be provided at right angles
to the tail guy arm, having brackets carrying runners or rollers also working in the
said groove or race and connected at their outer ends to side guy rods from the top
of the king post.
The ring frame being securely bolted to the sleeper beams, the strain on the tail

page_text: guy is taken by the top flange of the groove or race, thus preventing the upsetting
of the crane.
Immediately below and projecting radially in the same direction the jib may also
be provided a fourth radial timber or timbers, carrying runners working in the
before-mentioned groove or race. These timbers for the sake of distinction may be
called the "jib arm." To the outer end of the jib arm, or to the brackets on the
same carrying the rollers or runners, are secured the lower ends of a pair of
channel or H iron struts, attached at their upper ends to the sides of the king post.
The jib moves up and down (radially) between these iron struts. The bottom
flange of the ring frame, by means of the rollers at the end of the jib arm receives
the thrust from the side struts.
My invention further comprises means for preventing the fall of the jib in case
of rupture of the jib chain. For this purpose I provide a rack or racks, which are
fixed to the inner sides of the channel iron side struts, and a catch bar or bars
hinged in the direction of their length to the jib, one on each side. By means of
rods and levers attached to the hinged shafts of the catch bars, these latter may be
In
pushed out so as to engage with the rack or racks, or withdrawn to clear them.
their normal position the catch bars stand, so as to engage with the rack. The
teeth of the rack are not parallel throughout the length of the rack, but vary
according to the inclination of the jib when opposite the different parts of the rack.
The above arrangement may be modified by attaching the rack to the jib and
making the rack moveable up and down the jib, so as to remain opposite the struts
however the inclination of the jib may vary. A catch plate or plates attached to
the side struts is made moveable up and down the struts so as to remain opposite
the jib, whatever may be the inclination of the latter.
And in order that my invention and the manner in which the same is to be
performed may be more readily and clearly understood, reference is given to the
accompanying sheet of drawings and to the letters and marks thereon; in which
Figs. and 2 are vertical elevations the lower portions in cross section on
lines X X and Y Y respectively of Fig. 3, which is a plan of a builders' crane
constructed in accordance with my invention. The same letter is used for the same
or corresponding part in all the views.
A. A. and B. B. are the two pairs of parallel timbers or sleepers, bolted together
where they cross each other and weighted at their outer ends to secure stability.
C is the ring frame having top and bottom flanges a and b, which form a groove or
In Figs. 4 and 5 a cross section of the frame is shewn to a larger scale, the
former shewing the groove or race formed on the outside, and the latter on the
inside of the ring,
race.
d is the foundation plate carrying the pin or pivote for the king post D. f is the
king post socket piece fitting over the pin or pivot e and carrying the foot of the
king post D, here shewn as two uprights bolted together, g g are timbers forming
the tail guy arm and carrying at their outer ends the brackets hh, see also Figs. 4
and 5. A stud pin or axle i fixed in each bracket carries the runner or roller j.
The axle is mounted so as to be at right angles to the tail guy rod k, or to the
direction of the strain transmitted through the guy rod k to the runner j. The tail
guy rod is connected by a pin or bolt to the brackets h. m. m. are side guy arms,
and n is the jib arm, all provided with similar brackets h and rollers or runners j.
The outer end of the jib armn n is connected to the upper part of the king post by
means of the channel iron struts o. m³ are the guy rods connecting the outer ends
0 of the arms m with the top of the king post.
p indicates the gearing for hoisting and lowering and for altering the iuclination
of the jib, and g is a vertical shaft carrying at its lower end a pinion engaging with
the rack circle for slewing round the crane.
s are the racks attached to the side struts o having teeth radial to the hinge of
5 the jib. t are the hinged side bars, which can be drawn out sideways so as to
engage with the rack teeth, or lowered so as to clear the rack teeth, by means of
the lever v, connecting rod v, lever w, and hand lever z.

page_text: 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 I
clain: is :-
1. In cranes the combination of a ring having top and bottom flanges forming a
groove or race, and mounted on two pairs of parallel sleepers, with a king post
pivotted to the centre of the ring and provided with radial arms, carrying at their
outer ends brackets provided with runners fitting in said groove or race, the ends of
the said arms or the brackets being connected by tie or guy rods to the upper part
of the king post.
2. In cranes the combination of a square frame formed of two pairs of parallel
sleeper beams A and B with projecting ends, a ring Chaving top and bottom
flanges a and b forming a groove or race, a king post foundation plate d preferably
formed as a cross, a king post socket or pivot piece f, a king post D, a radial tail
guy arm g, radial side guy arms m, a radial jib arm n, all said arms provided with
brackets h carrying runners ; fitting in said groove or race and connected
respectively by means of guy rods and a strut to the upper part of said king post.
3. In cranes the combination of a ring frame C having top and bottom flanges a
and 6 forming an inside or outside groove or race with runners ; working in said
groove or race and mounted on an axle i connected directly or indirectly to the tie
or guy rodsk and m¹ approximately at right angles to said tie or guy rods
substantially as and for the purpose herein set forth and illustrated in Figs. 4
and 5.
4. The means herein described and illustrated for supporting the jib in case of
rupture of the jib chain.
Dated this 25th day of February 1895.
J. CLARK JEFFERSON,
2, East Parade, Leeds, Agent for Applicant.