Improvements in Cranes.
Year: 1899

page_text: Improvements in Cranes.
I, THEOPHILUS STANLEY MOSSMAN, Engineer, 3, Claremont Road, Seaforth,
Liverpool, do hereby declare the nature of this invention to be as follows: —
This invention relates to derrick cranes and consists of an improved method
of stepping the lower or fulcrum end of the derrick jib or boom.
According to this invention a derrick jib or boom works upon a ball-and-
socket joint. The foot of the jib possesses a ball which lies in a cup bearing
secured to the upright pole or standard. The ball is retained in its cup by a
cap which is bolted down to the bearing, and the position of the jib is capable
of adjustment by providing the bearing with two or more cups, into either of
which the jib ball may be placed and secured by the cap referred to.
"
J. A. COUBROUGH,
Chartered Patent Agent, 10, 'St. George's Crescent, Liverpool,
Agent for the Applicant.
Improvements in Oranes.
I, THEOPILUS STANLEY MOSSMAN, of 3, Claremont Road, Seaforth, Liverpool,
Engineer, 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;-
-
This invention relates to derrick cranes and consists of an improved method
of swivelling the lower or fulcrum end of the derrick jib or boom.
REFERENCE TO THE DRAWINGS.
Figure 1 is a general view of a derrick crane whose boom is swivelled accord-
ing to my invention.
Figure 2 is a side elevation of my improved means of swivelling a derrick
boom, and Figure 3 is a plan thereof. Figures 4 and 5 are a front view and
plan shewing the means employed for retaining the boom end in place.
Figures 6, 7, and 8, are details of the boom end.
Figures 9, 10, and 11, are a front view, cross-section, and. plan, of a modified
form of swivel socket, and Figures 12 and 13, are an elevation and plan showing
its application to a mast.
The foot of the boom A is fitted with a forked clamp a upon which is formed
the pin b. This pin is screwed into a steel ball which forms the pivot of thé
C

page_text: boom. A ring d, formed in two halves embraces the mast or standard e and is
secured thereto by bolts. Upon this ring are formed a series of cups f of size
to receive the balls c: These cups f form sockets for the ball c and allow of the
boom being pivotted at different points on the circumference of the mast e at
will, so that the boom may be adjusted to the best position for dealing with the
goods to be raised or lowered. In order to retain the ball in its cup f, the
cap is placed over such cup and secured to the ring by bolts. This cap
partially encloses the ball c in the cup f, that is to say, the cap g and cup f
receive more than one-half of the ball and so retain it, whilst at the same time
allowing the boom to assume the different inclinations necessary in ordinary
work.
In Figures 9, 10, and 11, is shewn a single socket h, possessing a cup ƒ and
a cap g. The socket h has flanges possessing bolt holes, and is adapted to be
secured at any point on the circumference of the mast e as follows. Around
the maste is rivetted or bolted an angle-iron i. (Figures 12 and 13).. Upon
this angle iron is rivetted a plate k. In the plate and angle iron are drilled
bolt-holes which coincide with the bolt-holes in the socket-flanges A¹. The
socket may thus be bolted down to any desired part of the plate .,
1
By my invention the point of fulcra is kept close to the mast e and the weight
on the boom is concentrated on such point. I dispense with the present goose-
neck or pin joint and its overhanging parts and weakness. The boom may not
only move in the vertical plane, but may swing in any direction, owing to the
universal movement capability of the ball e.
Having now particularly described and ascertained the nature of iny said
invention and in what manner the same is to be performed; I declare that what
I claim is: :―
1. For the purpose of swivelling the boom-end of a derrick crane, the ring d
on which are formed a series of cups f which receive the ball ic of the boom-
end, said ball being retained in either cup by a cap g, substantially as described.
2. For the purpose of swivelling the boom-end of a derrick crane, the plate &
disposed around the maste and secured thereto by the angle-iron said plate
affording provision for bolts by which the socket h may be secured thereto
at any point around such mast, the ball of the boom end being retained in a
cup in such socket by a cap g, substantially as described.
1000
J. A. COUBROUGH,
Chartered Patent Agent, 10, St. George's Crescent, Liverpool,
Agent for the Applicant.