Improvements in Hand and Steam Derrick Cranes.
Year: 1896

page_text: Date of Application, 30th Nov., 1896
PROVISIONAL SPECIFICATION.
Improvements in Hand and Steam Derrick Cranes.
I, JOHN GLEDHILL, of J. and E. Gledhill Limited, of St. Stephen's Ironworks,
Lindley, Huddersfield, in the County of York, Engineers and Crane Makers, do
hereby declare the nature of this invention to be as follows:-
This invention refers to hand and steam derrick cranes, and comprises means
for making the motion for adjusting the jib or hoisting barrel more reliable and
for avoiding all liability of disconnection of the parts when adjusting, whereby
the sudden and unexpected descent of a load suspended from the crane and con-
sequent danger to life and limb are entirely prevented.
In carrying out my invention I employ a suitable lever which is pivotted on
a stud carried in a bracket or standard, one end of said lever being connected
in a suitable manner to the locking bar for locking the jib, while near to the
opposite end of such lever, and made integral therewith or attached to same is
a lug or projection adapted to engage with a collar or boss fast on the sliding
shaft which carries the driving pinion for adjusting the jib or hoisting barrel. A
metal strap is provided to hold the lever in position close to the sliding shaft.
The said lever is movable with the sliding shaft, or independently thereof, within
the limits of the metal strap and can be used to slide the said shaft endwise in
its bearings. The action of the lever is to render it impossible to unlock or
adjust the jib unless the driving pinion is first slided fully into position in mesh
with the spur gear for that purpose, nor can the driving pinion be thrown out
of engagement win said spur gear, until the jib adjusting motion is perfectly
locked, this being effected as follows:-If it is proposed to adjust the jib, the
driving pinion on the sliding shaft is slided into gear with the requisite spar
gear and the hand lever is then moved in the same direction until the lug or
projection thereon abuts against the collar on the sliding shaft, this movement
of the lever forcing the locking bar in a contrary direction and withdrawing the
locking pin out of a slot, or opening, or socket, in the flange of the jib barrel,
whereby the jib adjusting motion is released. In like manner, the driving pinion
cannot be thrown out of gear with the spur wheel concerned until the lever has
been actuated in a reverse direction, in doing which it moves the locking bar
back again and locks the jib, this result obtaining whether the lever be actuated
by hand, or by the movement of the sliding shaft in throwing the pinion out
gear.
of
By the means described all fear of accidents happening when adjusting the
jib or hoisting barrel is done away with.
Dated this 28th day of November 1896

page_text: Improvements in Hand and Steam Derrick Cranes.
I, JOHN GLEDHILL, of J. and E. Gledhill Limited, of St. Stephen's Ironworks,
Lindley, Huddersfield, in the County of York, Engineers and Crane Makers, do
hereby declare the nature of this invention and in what manner the same is to
he performed, to be particularly described and ascertained in and by the following
statement:-
This invention refers to hand and steam derrick cranes, and comprises means
for making the motion for adjusting the jib more reliable and for avoiding all
liability of disconnection of the gearing when adjusting the jib whereby the
danger of a sudden and unexpected descent of the jib of the crane and consequent
danger to life and limb are materially reduced.
In carrying out my invention I employ a suitable lever which is pivotted on
a stud carried in a bracket or standard, one end of said lever being connected
in a suitable manner to the locking bar for locking the jib, while near to the
opposite end of such lever and made integral therewith or attached to same is
a lug or projection adapted to engage with a collar or boss fast on the sliding
shaft which carries the driving pinion for adjusting the jib. A metal
strap is provided to hold the lever in position close to the sliding shaft.
The said lever is moveable with the sliding shaft, or independently thereof within
the limits of the metal strap and can be used to slide the said shaft endwise in
its bearings. The action of the lever is to render it impossible to unlock or
adjust the jib unless the driving pinion is first slided fully into position in mesh
with the spur gear for that purpose, nor can the driving pinion be thrown out
of engagement with said spur gear until the jib adjusting motion is perfectly
locked.
In order that my said invention may be fully understood reference is herein-
after had to the annexed sheets of drawings forming a part of this Specification,
in which: -
Fig. 1 is plan view of so much of a derrick crane as is essential to shew the
application of my improvements; and Fig. 2 is end elevation of same looking
in the direction of arrow A in Fig. 1.
Referring to the drawings letter a represents a hand lever which is pivotted
on a stud b secured in a bracket c (Fig. 2) fast on a cross rod or shaft secured in
the side frames d. The end a¹ of the hand lever a is provided with a slot or
opening e through which extends a stud f projecting up from a boss or collar f¹
fast on the locking bar g. A nut h is screwed on the end of the stud f to secure
the lever a to the locking bar. On the end of the locking bar is fast an arm i
which carries at its extremity a locking pin j, adapted when slided towards
the jibbing barrel k, to enter and engage with one of the openings or sockets k¹
formed in the edge of the flange of said barrel. The end a² of hand lever a
has attached or formed about midway on one side or edge thereof, a lug or swell a³
which is adapted to engage with a collar, or boss 7 fast on the sliding shaft m which
carries the driving pinion n for adjusting the jib barrel. A metal strap or yoke o
fast to the underside of the end a2 of lever a and embracing the sliding shaft m,
though not connected therewith, maintains the lever a in position close to the
shaft and allows it to be moved with, or independently of same.
This action of the means comprising my improvements renders it impossible
for the jib barrel k to be unlocked or adjusted unless the driving pinion n is
first slided fully into position in gear with the double purchase gear p, or for

page_text: the said driving pinion to be thrown out of engagement with said spur gear until
the jib adjusting motion is perfectly locked, this being effected in the following
manner: If it is proposed to adjust the jib barrel the driving pinion n on
sliding shaft m is slided into gear with the double purchase gear p, and the hand
lever A is then moved in the same direction, or to the right, until the lug or
swell 3 thereon abuts against the collar /, as shewn in full line in Fig. 1, this
movement of the lever forcing the locking bar g in a contrary direction, or to
the left, and withdrawing the locking pin out of the opening K¹ in the flange
in which it has been engaged, as shewn in Fig. 1, whereby the jib adjusting
motion is released and can be adjusted in the ordinary manner.
In the same way the driving pinion n cannot be thrown out of gear with the
double purchase gear p until the hand lever a has been actuated in a reverse
direction to the position shewn in dotted lines in Fig. 1, in doing which it moves
the locking bar g back again to the right and forces the locking pin j into an
opening in the flange of barrel k which is, or happens to be first brought into
alignment therewith, as shewn in dotted line in Fig. 1, and thereby locks the
jibbing barrel, this result obtaining whether the lever a be actuated by hand or
by the movement of the sliding shaft m in throwing the pinion out of gear with
the double spur wheel p, and into gear with the spur wheel g.
By the means herein before described all liability of accidents happening when
adjusting the jib of the crane is materially reduced.
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:-
Firstly. In hand or steam derrick cranes, the application and employment of
a pivotted lever connected at one end with a sliding bar and adapted to engage
near its opposite end with a collar or shoulder on the sliding shaft whereon the
driving pinion is mounted, the said lever being arranged, constructed, and
operating in the manner and for the purposes substantially as herein shewn and
described.
Secondly. In hand and steam derrick cranes, the combination with the sliding
shaft m having the driving pinion thereon, sliding bar g, locking pin j, and
openings K¹ in the flange of the jib barrel, of the means substantially as herein
shewn and described for locking and releasing the jib adjusting motion and
preventing disconnection of the parts by accident or mistake.
Dated this 25th day of August 1897.
TASKER & CROSSLEY,
Patent Agents, Huddersfield, Agents for the Applicant.