AN IMPROVED PORTABLE CRANE FOR THE USE OF BUILDERS AND OTHERS."
Year: 1881

page_text: LETTERS PATENT to John Hurst, of Brighton, in the County of Sussex,
for an Invention of "AN IMPROVED PORTABLE CRANE FOR THE USE OF
BUILDERS AND OTHERS."
PROVISIONAL SPECIFICATION left by the said John Hurst at the Office of
the Commissioners of Patents on the 16th May 1881.
JOHN HURST, of Brighton, in the County of Sussex. "AN IMPROVED PORTABLE
CRANE FOR THE USE OF BUILDERS AND OTHERS."
My Invention relates to a small portable crane capable of being readily fixed
upon a scaffold or other pole in any position in which it may be required for raising
and lowering builder's materials.
The crane consists of a swinging jib pivoted between a pair of rings adapted to
embrace the scaffold or other pole, the said rings being made in halves hinged
together at one side, so that they may be opened to be applied to or removed from
the pole, and are provided with clamping screws, by which they are firmly secured
thereon.
The jib is stepped in the lower ring, and has a pivot received in a collar on the
upper ring, so that it can swing freely. It carries the usual block and tackle at
its outer end.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Hurst in the Great Seal Patent Office on the 16th
November 1881.
JOHN HURST, of Brighton, in the County of Sussex. "AN IMPROVED PORTABLE
CRANE FOR THE USE OF BUILDERS AND OTHERS."
My Invention relates to a small portable crane capable of being readily fixed
upon a scaffold or other upright pole wherever required for raising and lowering
builder's materials.
The crane consists of a jib pivoted or fixed between a pair of rings adapted to
embrace the scaffold or other pole, the said rings being made in halves, which may
be hinged together at one side, so that they may be opened to be applied to or
removed from the pole, and are provided with clamping screws by which they are
firmly secured. The jib is stepped in the lower ring, and has a pivot received in a
socket on the upper ring, and it can either be fixed or swing freely as required.
It carries the usual block and tackle at its outer end.
Figure 1 is an elevation of the crane as fixed, the lower ring being represented
in section; Figure 2 shows the two rings separately in plan; Figure 3 shows a
hinged ring.
A is the crane jib constructed by preference of wrought iron; B, B2, are the two
rings in which it is mounted; C is the scaffold or other upright pole. The jib A
is provided with pivots a, a¹, which are received in corresponding sockets b, b₁,
forged on the rings, preferably at the middle of one half thereof. Each ring is
divided into two parts or halves, which may either be hinged together at one end,
as in Figure 3, and connected at the opposite ends by a screw D, or the parts
of the ring may be similarly connected at both sides by screws, as shown in
Figure 2.
The lower pivot has a square part a3 which is received in a corresponding square
hole in the socket of the lower ring, and whereby the jib is held stationary or
prevented from swinging on its pivots. By reversing the lower ring so that the
square a² cannot enter the hole of its socket the jib is free to swing round on its
pivots. E are small V shaped projections on the inside of each ring, which become
indented in the pole on which the rings is clamped, holding the ring securely in
position and preventing them from slipping round on the pole when the jib is
swung round.
In Figure 2 each screw D passes through and bears with a shoulder upon it
against an ear on the one half of the ring and screws through a tapped hole in the
ear of the other half of the ring, as shown, whilst in Figure 3 the screw works in
a nut d pivoted at between ears so as to permit of the ring being opened out
on its hinge.
The scaffold crane of my Invention can be quickly fixed by one man to any
upright pole of sufficient strength, and can be as readily unfixed and fitted up
again in any other position where it may be required, whereby a great saving of
time is effected, two men being generally engaged an hour or two in fixing
up a jib of the ordinary kind used, and as long in transferring it to a new
position.
Having described the nature of my Invention, and the manner of performing the

page_text: same, I declare that what I claim as my Invention to be protected by the herein.
before in part recited Letters Patent is,--
The improved portable crane consisting in the combination with a jib of a pair
of rings between which the jib is mounted, the rings being constructed in two parts
5 and provided with clamping screws, substantially as shown and described, whereby
they are adapted for clasping an upright pole as described.
In witness whereof, I, the said John Hurst, have hereunto set my hand
and seal, this Fifteenth day of November, A.D. 1881.
JOHN HURST (TC)