Automatic Locking Lever and Lifting Lever Combination for Electrical Lifts, Cranes, or other Machinery.
Year: 1897

page_text: Date of Application, 22nd Dev., 1807
Complete Specification Left, 10th Sept., 1898-Accepted, 17th Dec., 1898
Date of Application, a4110 DV., TOUT
Complete Specification Left, 10th Sept., 1898-Accepted, 17th Dec., 1898
.
Automatic Locking Lever and Lifting Lever Combination for
Electrical Lifts, Cranes, or other Machinery.
CHARLES EDWIN BINNS HOLT, 10 Piece Hall Yard, Bradford, in the County of
York, Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to a locking apparatus for electric lifts, cranes or other
machinery, which prevents them from being set in motion until the motor has
attained its full speed. For this purpose I employ a cylinder charged with oil,
and two jars containing acid and water. In these jars I fix two lead plates and
connect them with the two electrical mains and two mercury cups, which are
secured to the side of the inclosure.
To the piston of the cylinder I fix a crosshead, made from any suitable
material, from which are suspended two lead plates which enter the solution in
the jars as the piston gradually descends; and from the ends of the crosshead I
fix two copper prongs which enter the two mercury cups & cut the resistance
out of circuit before it pulls the locking lever from the lifting lever.
By this action the lifting lever will be prevented from bringing the two fric-
tion pulleys into gear until the motor is full on, thereby avoiding a severe strain
& sparking on the motor, and also preventing a shock being felt all over the
lighting system.
To the bearing of the crane I fix a locking lever made to any shape and of any
suitable material from which I attach a light chain or wire to main starting
switch or motor.
Dated this 21st day of December 1897
Automatic Locking Lever and Lifting Lever Combination for
Electrical Lifts, Cranes, or other Machinery.
I, CHARLES EDWIN BINNS HOLT, of 10 Piece Hall Yard, Bradford, 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 ascer-
tained in and by the following statement:-
This invention relates to a locking apparatus for electrical lifts, cranes, or
other machinery which prevents them from being set in motion until the motor
has attained its full speed.
For this purpose I employ a cylinder D charged with oil, and two jars E and

page_text: E' containing acid and water. In these jars I fix two lead plates and connect
them with the two electrical mains F and F and two mercury cups G and G¹
which are secured to the side of the inclosure.
To the piston H of the cylinder D I fix a crosshead I made from any suitable
material, from which are suspended two lead plates J and J¹ which enter the
solution in the jars as the piston H gradually descends. From the ends of the
crosshead I fix two copper prongs K and K which enter the two mercury cups
G and G and cut the resistance out of circuit before it pulls the locking lever A
from the lifting lever B, as follows: the locking lever A is fixed to the bearings
of the crane, is made to any shape and of any suitable material, and is attached
by a light chain or wire to the main starting switch of the motor as shewn by
the drawings. The lever A is thus locked and unlocked by the moving of the
switch to on or off as required as shewn in the drawings, and thus prevents
the crane being set in motion until the resistance is cut out of circuit before it
pulls the locking lever A from the lifting lever B as before described.
"
By this action, the lifting lever B will be prevented from bringing the two
friction pullies C into gear until the motor is full on, thereby avoiding a severe
strain and "sparking" on the motor, and also preventing a shock. being felt all
over the lighting system. When the light chain or wire is in the position shewn
at A (off) the crane is prevented from being set in motion, and cannot be re-
started or moved from any floor until the operation before described and shewn
at A (on) has been gone through.
Hitherto cranes have not been fitted with such apparatus and the tendency on
the part of the user has been to put the full load on to the motor before it has
attained its normal working speed, this has caused a severe strain and "spark-
ing on the motor and the blowing out of fuses, as where a crane is started to
lift a dead weight the motor under such circumstances momentarily "pulls up"
and thereby causes the lights to flicker all over the system.
"
No current is required to work my apparatus, it being attached to the main
starting switch of the motor.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:
An automatic locking lever A combined with a lifting lever B for electrical
lifts, cranes or other machinery, substantially in the manner and for the purpose
as hereinbefore described.
Dated this Ninth day of Santamhor 1808