Year: 1895

page_text: Date of Application,, 24th Apr., 1895-Accepted, 8th June, 1895
I, JOSEF HOLUB, of Prague, Bohemia, in the Empire of Austria; Engineer;""
do hereby declare the nature of my said'invention and in what manner the same
is to be performed; to be particularly described and ascertained in and by: the
following statement :---
The object of my invention is to manufacture an improved hand-power safety
hoist.
My invention consists of a fixed belt pulley having a worm-wheel integral
therewith; a worm meshing into the worm-wheel, driven by a pulley wheel and
endless hand. rope; a belt or rope being wound upon the belt pulley and passing
round a loose pulley carrying a lifting hook; also a self-acting brake.
And in order that my said invention may be particularly described and
ascertained, reference is hereby made to the accompanying drawings, in which
similar letters of reference iudicate corresponding parts.
Fig. 1 is an elevation of my elevation, partly in section.
Fig. 2 is a sectional' elevation, at right angles to Fig. 1.
Fig. 3 is a front view of the driving pulley.
c is the fixed pulley, the front disc g being preferably movable. d is a worm-
wheel integral with the fixed pulley c. z is a worm meshing with the worm-wheel d
and mounted upon the shaft e, working in the bearings i and u. I is a grooved
pulley-wheel fast on the shaft e. The apparatus is mounted in a suitable framing
consisting (preferably) of two parallel plates a¹, a², united together by bolts b
and K, and the cross-head c', the latter carrying the hook h. The wheel c revolves
upon the bolt b, the flanges being made deep to carry the belt R. One end of
this belt is fixed to the wheel cat R³ and R, and recessed into a groove R³, being
retained in the groove by the disc g; from thence it is carried to and between the
flange of the wheel and the disc g, the other end of the belt R being carried round
the loose pulley and fixed to the bolt K by the wedges R¹ R', as shown in Fig. 1.
A steel or other rope may be substituted for the belt R. The pulley-wheel lis
actuated by the endless hand rope L, which is guided by the small pulleys m² m³,
carried by the frame n' n³. A sleeve p (preferably of steel) bored cylindrically
and coned externally, is fitted to slide on the end of the shaft e, and carried round
with the shaft by means of the feather o. 7 is a spiral spring surrounding the
shaft e between the fixed collar and the sleeve p, whereby the sleeve p
longitudinally into the cup bearing r. This bearing is coned internally to fit
the outer surface of the sleeve p. The outer surface of the bearing r is
cylindrical, so as to rotate freely in the fixed bearing u, the end a turning against
the hard steel button a¹. is a ratchet wheel integral with the cup bearing r, and
' is a pawl engaging with a, whereby the bearing is prevented from rotating in u
when the load is descending. In this case the conical sleeve p rotates slowly in
the bearing r, the pressure of the coiled spring g causing the conical surfaces to.
operate as a brake, and reduce the descent of the load to a safe speed.
pressed
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 improved hand-power safety-hoist, substantially as and for the purposes
described.

page_text: 2. In a hand-power safety-hoist, the combination of a fixed pulley o and worm-
wheel d; a horizontal shaft e carrying a pulley wheel a worm z and a spring
brake appliance; a band or rope R, one end of which is fixed to the pulley,
and, after passing round a movable pulley f, the other end of the band or rope is
fixed to the frame of the hoist; all severally operating substantially as and for the
purposes herein before described and illustrated by the drawings.
3. In a hand-power safety-hoist, the combination with a fixed pulley c and
worm-wheel d, of a movable plate g, operating as a flange and for retaining the
belt or rope R in position, substantially as herein before described and illustrated
by the drawings.
4. In a hand-power safety-hoist, the combination with a fixed pulley c, worm-
wheel d and worm 2, of a spring brake operating only when lowering the load,
substantially as herein before described and illustrated by the drawings.
Dated 24th Aneil 1895
GEO. DOWNING,
8, Quality Court, London, W.C., Agent.
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.