Improvements in Self-sustaining Hoists, Lifts, Pulley-blocks, and analogous Appliances.
Year: 1892

page_text: Date of Application, 26th Jan., 1892
Complete Specification Left, 28th Nov., 1892--Accepted, 21st Jan., 1893
PROVISIONAL SPECIFICATION.
Improvements in Self-sustaining Hoists, Lifts, Pulley-blocks, and
analogous Appliances.
I, ANN ELIZABETH PICKERING, Widow and Executrix of Jonathan Pickering,
(late of Torquay in the County of Devon, who died on the 18th day of January,
instant,) at present residing at Torquay, aforesaid, do hereby declare the nature of
my said invention to be as follows:-
The object of this invention is to construct an improved hoist, lift, pulley-block
or analogous appliance whereby the load may be sustained with greater certainty
than hitherto..
The invention relates more especially to certain improvements in that class of
hoists, lifts etc. for which Letters Patent were granted to Jonathan Pickering and
Joseph Thompson Pickering No. 415 of 1883.
My improvements consist in constructing an arrangement whereby the load may
be suspended or sustained on either side of the winding drum or barrel.
For this purpose I use a drum or box, similar to that described in the before
mentioned Letters Patent; inside this drum or box I place two discs, having one
of each of their faces formed with inclined or wavy surfaces and with teeth or
similar provisions formed upon them; one disc being a counterpart of the other.
Between these discs I place a suitable number of pinions, in such a manner that
they are free to roll, in either direction, and constitute the wedging action, thus
the discs are caused to separate and press against the faces of the drum or box,
whereby the load is sustained. Suitable provision is made to regulate the positions
of the discs in the box as also to drive the said discs, a cam, clutch or other suitable
arrangement being employed for this purpose..
Dated 26th January 1892.
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.
COMPLETE SPECIFICATION.
Improvements in Self-sustaining Hoists, Lifts, Pulley-blocks, and
analogous Appliances.
I ANN ELIZABETH PICKERING Widow and Executrix of Jonathan Pickering
late of Torquay in the County of Devon, who died on the 18th day.of
January 1892, at present residing at Torquay aforesaid, 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 this invention is to construct an improved hoist, lift, pulley-block
or analogous appliance in such a manner that the load may be sustained with
greater certainty than hitherto.
The invention relates more especially to certain improvements in that class of
hoists, lifts etc. for which Letters Patent were granted to Jonathan Pickering and
Joseph Thompson Pickering No. 415 of 1883, and my improvements consist in
constructing an arrangement whereby the load may be suspended or sustained on
either side of the winding drum or barrel.
For this purpose I use a drum or box, similar to that described in the before
LD: 077

page_text: mentioned Letters Patent; inside this drum or box I place two discs, having one
of each of their faces formed with inclined or wavy surfaces and with teeth or
similar provisions formed upon them; one disc being a counterpart of the other.
Between these discs I place a suitable number of pinions, in such a manner that
they are in gear with both the discs and capable of rolling thereon in either
direction, so as to bring into operation the wedging action of the inclined faces on
the discs. The discs are thus caused to separate and press against the internal faces
of the drum or box, whereby the load is sustained. Suitable provision is made to
regulate the positions of the discs in the box as also to drive the said discs, a cam,
clutch or other suitable arrangement being employed for this purpose.
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 indicate corresponding parts.
Fig. 1 is an elevation, partly in section, showing the application of my invention
to a pulley block or hoist.
Fig. 2 is a view showing the drum in section, and the internal gear in elevation.
Fig. 3 is a face view and Fig. 4 an edge view of one of the discs.
Fig. 5 shows details of a modification, in which pins are used instead of teeth.
...a is a circular box formed of cast or wrought iron, or other suitable material.
b is a detachable cover. cand care two discs formed with a series of inclined
toothed faces, as shown in Figs. 3 and 4. The disc is keyed to the spindle f
carrying the pinion m, gearing into the spur wheel s. is a chain or rope pulley
fast on the axle or spindle t. The disc e is loosely mounted upon a sleeve W, running
loosely upon the spindle f. n is a hand wheel for a chain or rope, keyed to the
sleeve, and the other end is provided with two clutch jaws. The outer faces of
the discs c and c', next to the internal faces of the box a, are turned true and flat,
the internal faces of the discs being formed with inclined toothed faces, as herein
before described. P P P are three conical toothed pinions, gearing with the
dises c c d d are blocks formed in one with the discs c c'. eee are three blocks
cast on the sleeve w. These blocks have a limited amount of rotary motion.
between the blocks d. The blocks e also serve to retain the pinions p in position,
between the blocks e and the internal periphery of the box a.
Instead of the toothed discs c c¹, discs c may be substituted, as shown in Fig. 5,
the pinions being formed as shown at p¹.
The manner in which the invention is caused to sustain a load upon the wheel »
is as follows-The clutch jaws upon the sleeve w are so placed that, when the
wheel n is operated by hand or otherwise, the respective positions of the inclined
toothed planes upon c and c¹, the toothed pinions pp, clutch jaws e e, and blocks dd,
are such that free motion can only be obtained when the wheel n is operated.
When, however, the tension upon the wheel n is relieved, and the disc c¹ is slightly
revolved backwards, by the load on r, the respective positions of the discs c and c¹
are altered, and the discs c and c' are forced apart by the pinions p p. This action
causes the back faces of the discs to press against the inner surfaces of the box a,
thus affording sufficient frictional resistance to sustain the load.
My invention is applicable to all kinds of hoists, cranes, lifts, and other hoisting
machinery.
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 :-
:-
1. In hoists, lifts, pulley blocks and the like, the combination of cams, having
teeth formed upon wave or curved discs, pinions p gearing therewith, blocks d and e
retaining the pinions in position; all so arranged in connection with the box a,
cover b, and other necessary gear, substantially as and for the purposes herein
before described and illustrated by the drawings.
2. The general construction, arrangement and combination of the several and

page_text: respective parts, together forming my invention of improvements in hoists, lifts,
pulley blocks and the like, substantially as herein before described and illustrated
by the drawings.
Dated 28th November 1809
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent