Improvements in Hydraulic Jib Cranes.
Year: 1899

page_text: Date of Application, 23rd June, 1899-Accepted, 5th Aug., 1899
COMPLETE SPECIFICATION.
Improvements in Hydraulic Jib Cranes.
I, HENRY BERRY, of Croydon Works, Hunslet, Leeds, in the County of York,
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 improvements in hydraulic jib cranes, and consists
in mounting on the ordinary jib of such crane, and between guide rollers fur.
nished thereon, a travelling or extending jib, capable of being moved endwise
in either direction by a hydraulic ram and cylinder; such extending jib being
connected with and operating a lever or levers carrying a guide pulley which with
another guide pulley forms a compensating arrangement for the lifting chain,
so that when the extending jib is moved inwards or outwards, the weight sus-
pended by the hook of the lifting chain will be retained at the same height during
such movement.
I will now proceed to describe my invention by the aid of the accompanying
illustrative drawings, in which :-Fig. 1 is a side elevation partly in section of
a crane according to my invention; Fig. 2 is a front view of the same; Fig. 3
is a plan of a portion thereof; and Fig. 4 is a ground plan of a shed, in which
such a crane may be suitably worked, as hereinafter referred to.
The crane is provided with ordinary jibs 2 and 2ª between which revolves in
suitable bearings 3 and 3ª shafts 4 and 4º, on which are secured the guide rollers 5
and 5, which carry the extending jib 6. This jib is constructed with side plates 7
and 7 held at the requisite distance apart by the stays 8 and 9; the inner ends 10
and 10" of the said plates pass under a top guide roller 11 secured on a shaft 12
which revolves in bearings 13 and 13 in the brackets 14 and 14ª secured to the
jibs 2 and 2ª. On the outer projecting ends 15 and 15 of the side plates 7 and 7"
is mounted the bracket 16 provided with bearings 17 and 17 in which revolves
the shaft 18 on which is secured the lifting pulley 19. In a convenient position
on the crane posts 20 is secured a bracket 21 furnished with a bearing 22 provided
with a cap 22, in which bearing is mounted and securely held a hydraulic cylin-
der 23 in which works a ram 24 furnished with cup leathers 25 and 25 placed
back to back and secured thereto by the nut 26; the piston 27 passing out through
the gland 28 is connected to the cross bar 29 by the nut 30, such cross bar 29
being secured to the side plates 7 and 7 of the extending jib 6.
In a convenient position in the side plates 7 and 7ª are holes through which
pass the ends 31 and 31 of the bolt 32, to which are attached the ends 33 and 34
of the connecting rods 35 and 36. The other ends 37 and 38 of the said rods
are furnished with studs 37 and 38ª to which are connected the upper ends 39
and 39 of the levers 40 and 41, the lower ends 42 and 42" of these levers being
mounted to oscillate upon the outer projecting ends 43.and 43 of the cross bar 44,
which is secured to the struts 45 and 46, and on which revolves the guide
pulley 47. Between the upper and lower ends of the levers 40 and 41, in a
convenient position to give the required compensation to the lifting chain 48
is secured the cross bar 49 on which revolves the guide pulley 50. Another similar

page_text: guide pulley 51 revolves on the shaft 52 which is mounted in bearings 53 and 53*
on the brackets 54 and 55 secured to the struts 45 and 46.
The lifting chain passes from the hydraulic cylinder 56 under the guide
pulley 57, then over the guide pulley 47 and around the guide pulley 51, then
around the guide pulley 50 and over the lifting pulley 19 to the hook 58, from
which the weight is suspended the action being such, that the weight being
lifted to any desired. position, and the extending jib being run in such jib operates
the levers 40 and 41, and the guide pulley 50 consequently takes up the required
length of chain equal to the travel of the extending jib, thus preventing the
lowering of the weight during such movement; and on the jib being pushed out-
wards the reverse action takes place, which prevents the weight from rising.
It will be obvious that a crane of this construction will be useful in a shed
such as that illustrated in Fig. 4.
Reference being had to this figure:-In unloading the lorry a and transferring
such load into trucks b, the extending jib after receiving the load, will, before
the crane turns on its axis, have to be moved from its maximum radius c to its
minimum radius d in order to clear the columns e; and after having turned, it
would again have to extend its jib to the maximum radius c to load the trucks b.
It also is capable of storing goods on the platform f for loading onto lorries a
or into trucks b.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:
1. A hydraulic jib crane, provided with a travelling or extending jib capable
of being moved endwise in either direction by the ram of a hydraulic cylinder,
substantially as described and illustrated.
2. A hydraulic jib crane comprising a travelling or extending jib actuated by
the ram of a hydraulic cylinder, and means actuated by said jib for adjusting
the lifting chain so as to prevent the suspended weight from rising or falling
during the movement of the extended jib, substantially as herein described and
illustrated.
3. A hydraulic jib crane comprising a travelling or extended jib suitably
mounted on a fixed jib and capable of being moved endwise thereon in either
direction by the operation of a hydraulic ram and cylinder, and a compensating
arrangement actuated by the movement of the travelling or extending jib in
such manner as to adjust the lifting chain so that the height or position of the
weight suspended from the hook thereof is not affected by the inward or outward
movement of the said travelling or extending jib, substantially as described.
4. In a hydraulic jib crane, a travelling or extending jib suitably mounted on
a fixed jib and capable of being moved endwise thereon either outwards or inwards
by the action of a hydraulic ram and cylinder; such extending jib being con-
nected with and operating a lever or levers carrying a guide pulley which in
conjunction with another guide pulley mounted on the framing of the crane forms
a compensating arrangement whereby the lifting chain passing over the said
pulleys is automatically adjusted so that the height or position of the weight
suspended from the hook thereof is not affected by the inward or outward move-
ment of the travelling jib, substantially as herein described and illustrated.
Dated this 23rd day of June 1890
R. E. P. CRAVEN,
Chartered Patent Agent,
King Street Chambers, 52, Wellington Street, Leeds,
Agent for the Applicant.