IMPROVEMENTS IN SELF-EMPTYING TIPPING BOXES
Year: 1884

page_text: PROVISIONAL
DIECIFICATION.
I, JAMES WILLIAM FINLAY BRYAN, of 93 Hope Street, Glasgow, in the County
of Lanark, Engineer, do hereby declare the nature of my said Invention for
"IMPROVEMENTS IN SELF-EMPTYING TIPPING BOXES," to be as follows :—
This Invention relates to self-emptying tipping boxes, such as are commonly
used in connection with cranes or hoisting gear for conveying and discharging
mortar, stones, coals, and other materials, and it consists in providing improved
devices for locking or securing and releasing the trap doors forming the bottom or
side of the box through which the materials are discharged.
The improved locking devices comprise a spring catch which is pivotted or fitted
at the side of the tipping box adjacent to the opening edge of the trap door, and
engages with a projection formed on the door. On this catch piece is fitted a stud
or pin forming the centre for a small cam or eccentric lever, to the end of which is
attached a cord, chain, or wire. The cam piece on the lever is fitted to bear against
a fixed plate on the bottom or side of the box, and when by pulling the cord, the
lever is slightly turned on its centre, the cam by pressing against this plate, raises
the spring catch from the side of the box, and thereby withdraws the catch from
the projection on the trap door, so that the door is released, and falls away by its
own weight, or by the weight of the material within the box.
The lever is prevented by a stop from turning beyond a distance sufficient to
effect the withdrawal of the spring to free the trap door, and in this respect, as
well as in the provision of a spring to retain the catch in place, the improved
locking devices differ from the ordinary arrangement of tumbling lever which
drops in the way of the material discharged from the box, and which must be
replaced by hand.
TL Ay of Nouch 1981

page_text: -
"
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1, JAMES WILLIAM FINLAY BRYAN, of 93 Hope Street, Glasgow, in the County
of Lanark, Engineer, do hereby declare the nature of my said Invention for
IMPROVEMENTS IN SELF-EMPTYING TIPPING BOXES and in what manner the
same is to be performed to be particularly described in and by the following
statement :-
This Invention relates to self-emptying tipping boxes, such as are commonly
used in connection with cranes or hoisting gear for carrying and discharging
mortar, stones, coals, and other materials, and it consists in providing improved
devices for locking or securing and releasing the trap doors forming the bottom or
side of the box through which the materials are discharged.
In the accompanying drawings Figures 1 and 2 are side and end elevations of a
tipping box fitted with my improvements. Figure 3 is a detailed view showing
the improved dovices to a larger scale.
The improved locking devices comprise a spring catch A which is pivotted or
fitted at the side of the tipping box B adjacent to the opening edge of the trap
door B, and which engages with a projection or projecting catch C fixed on the
door. On the catch piece A is fitted a stud or pin a forming the centre for a cam
or eccentric lever D to the end of which is attached a cord, chain, or wire E. The
cam piece d on the lever D is fitted to bear against a fixed plate or on the point of
the catch C at the side of the box, and when by pulling the cord, the lever D is
slightly turned on its centro a, the cam by pressing against this plate raises the
spring catch A against the power of the spring A and disengages the catch from
the piece C on the trap door, so that the door is released and falls away by its own
weight or by the weight of the material within the box. The dotted lines show
the position of the catch A when the door is disengaged.
The lever is prevented by a stop a' from turning beyond a distance sufficient to
effect the withdrawal of the spring to free the trap door, and and in this respect, as
well as in the provision of a spring to retain the catch in place, the improved
locking devices differ from the ordinary arrangement of tumbling lever which
drops in the way of the material discharged from the box, and which must be
replaced by hand. Figure 4 illustrates a modified arrangement in which the cam
acting lever D is centred on the box B and is adapted to be operated from above
or from below by cords E, the action of the lever D being against the inner face of
the spring catch A.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed I declare that what
I claim is,-
The improved arrangement of spring catch and releasing devices for tipping
boxes substantially as herein described and illustrated.
n
D1004