Year: 1895

page_text: Date of Application, 21st Feb., 1895
Complete Specification Left, 16th Oct., 1895-Accepted, 23rd Nov., 1895

page_text: 4TH METHOD.
I employ an auxiliary or moveable jib the foot of which is carried on wheels,
rollers, or slide blocks, arranged to travel between the flanges of channel guides
fixed to the side plates of main crane jib. The moveable jib gives the requisite
support to the grab when filling, whilst the wheels, rollers, or slide blocks, permit
it to travel freely along the guides, and to adjust itself to the vertical travel of
.the grab.
Dated this Twentieth day of February 1895.
I carry the foot pins of the moveable jib in sliding blocks working horizontally
between slide bars, carried in any convenient position, either on cheek plates of
cranes, or in separate castings on crane base plate, thus allowing the foot of jib to
adjust itself to the vertical movement of the jib head to which the grab is pivoted.
At the lowest position of the moveable jib the sliding block is prevented (if :
necessary) from moving, by stop pieces or other suitable means, till the grab is.
closed and ready for lifting. The stops are then thrown out of gear, when the
sliding blocks, carrying foot of jib, are free to accommodate themselves to the
vertical lift of the jib head carrying the grab.

page_text: THIRD METHOD.
When it is desirable, that the foot of the moveable jib should work on a fixed
centre, I attain the desired object as follows. The foot of moveable jib being
pivoted in any convenient position, the top of the jib is provided with a slot,
corresponding in length, to the height of the are described by the moveable jib.
This slot permits the trunnions carrying the grab to pass through slide blocks,
working between the flanges of side plates of said jib. The lifting links being
attached to the outer ends of trunnions, the movement of the said trunnions and
slide blocks in the slots, and between the flanges of side plates of jib, permits the
grab or bucket to travel in a vertical line, whilst allowing the jib head to travel in
the arc due to its radius.
The trunnion or gimbal ring carrying the grab is carried in slide blocks of a
channel section, capable of free rotation on the trunnion shaft. The channels in
said blocks are of a suitable depth to allow the moveable jib to slide between the
flanges. The lifting chains are attached to links which carry the trunnion or
gimbal ring, and the slide blocks. These links are placed between and separate
from the slide blocks, and permit the trunnion or gimbal shafts to freely rotate in
them. The slide blocks being free to rotate on the trunnion or gimbal shafts,
permit the moveable jib to freely slide between the channels, and describe the arc
due to its radius, whilst the trunnion or gimbal ring carrying the grab or bucket
travels in a vertical line. In some cases I provide the sliding blocks with small
rollers fitted inside the flanges for permitting the moveable jib to travel more freely
between them.
In the annexed drawing which shows my invention in the form in which I
generally prefer to employ it-
Fig. 1, is a side elevation of a crane fitted with my apparatus.
Fig. 2. is a part front elevation of same.
Fig. 3. is an enlarged detail, at end of moveable jib, showing more clearly the-
slide blocks, trunnion or gimbal ring, and lifting links.
Fig. 4. is a front elevation partly in section of same.
Fig. 5. is a side elevation of same.
Like letters refer to similar parts in all the views.
The grab or bucket a, is carried in the bearings b, of the trunnion or gimbal
ring e, which works freely in the lifting links d. These are carried by the sling
chains e, and crosshead f, which is attached to the pulley block g, and hoisting
chain in the usual manner. When working single instead of return chain as shown
in Fig. 1, the crosshead f carries a shackle bolt to which the lifting chain is
directly attached. At each end of the trunnion or gimbal ring shaft / is placed
a channel shaped sliding block j with or without rollers. These are capable of
turning freely on the shaft h, and the channels are of suitable depth, to permit the
side joists or plates of the moveable jib to freely travel between them. The
moveable jib is shown in Fig. I pivoted at the back of the crane, but it may
be pivoted in any other convenient position. The lowest position of moveable jib.

page_text: and grab is shown by dotted lines in Fig. 1. The thick dotted line A. A Fig. 1,
shows the path traversed by the side of grab or bucket when fixed at the head
of moveable jib, while the thin dotted line B B shows its path when fitted with my
sliding gear.
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
claim is ;
1. The combination with the moveable auxiliary or supporting jib, carrying the
grab or bucket, of slide blocks working on or between horizontal slide bars for the
purpose set forth, and substantially as described.
2. The combination with the moveable auxiliary or supporting jib, carrying the
grab or bucket, of a vibrating lever, for the purpose set forth and substantially as
described.
3. The combination with the moveable auxiliary or supporting jib carrying the
grab or bucket of slide blocks and slot for the purpose set forth, and substantially
as described.
4. The combination with the moveable, auxiliary or supporting jib, carrying
the grab or bucket, of wheels, rollers, or slide blocks, permitting the foot of jib, to
travel freely along guides, fixed on main jib, for the purpose set forth, and
substantially as described.
5. The combination with the moveable, auxiliary, or supporting jib, carrying the
grab or bucket, of slide blocks of channel section, with or without rollers, for the
purpose set forth, and substantially as described, and shown on the drawing.
Dated this Tenth day of October 1895.