IMPROVEMENTS IN HOISTS AND BRAKES
Year: 1881

page_text: LETTERS PATENT to Jonathan Pickering and Joseph Thompson Pickering, of
the Globe Works, Stockton-on-Tees, in the County of Durham, Mechanical
Engineers, for an Invention of "IMPROVEMENTS IN HOISTS AND BRAKES."
PROVISIONAL SPECIFICATION left by the said Jonathan Pickering and
Joseph Thompson Pickering at the Office of the Commissioners of Patents on
the 31st December 1881.
JONATHAN PICKERING and JOSEPH THOMPSON PICKERING of the Globe Works
Stockton-on-Tees in the County of Durham Mechanical Engineers. "IMPROVEMENTS
IN HOISTS AND BRAKES."
This Invention relates to improvements in hoists and brakes for raising and
lowering weights and has reference to an Invention for which Letters Patent were
granted to Jonathan Pickering 1st January 1879 No. 7. These improvements
consist in simplifying the mechanism described in the Specification referred to, and
for automatically suspending the load, and also for lowering the same with an
improved brake. These improvements are as follows. On the shaft of a hoist is
fixed an internal ratchet wheel which may for convenience be cast on the end of a
barrel, or to a lift chain wheel. Against this ratchet wheel is another wheel the
face of which has slots to receive pawls, this wheel is made broad to answer the
purpose of a drum wheel for braking it is also inade with a centre hole large
enough to run on the end of a boss cast on the carriage or plummer block through
which the shaft runs, this is done to avoid friction. The brake strap is put round
this drum wheel, and with a lever, screw or other equivalent suitably fixed, the
load will be sustained. In order to lower the load the brake is released. The
object of this arrangement in these improvements is to make an automatic self
sustaining hoist.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Jonathan Pickering and Joseph Thompson Pickering in the Great
Seal Patent Office on the 29th June 1882.
JONATHAN PICKERING and JOSEPH THOMPSON PICKERING, of the Globe Works,
Stockton-on-Tees, in the County of Durham, Mechanical Engineers. "IMPROVE-
MENTS IN HOISTS AND BRAKES."
This Invention relates to improvements in hoists and brakes for raising and
lowering weights, and has reference to an Invention for which Letters Patent
were granted to Jonathan Pickering dated the 1st January 1879 No. 7.
These improvements consist in simplifying the mechanism described in the
Specification referred to, and for automatically suspending the load, and also for
lowering the same with an improved brake.
These improvements are as follows:-On the shaft of a hoist is fixed an internal
ratchet wheel, which may for convenience be cast on the end of a barrel, or to a
lift chain wheel. Against this ratchet wheel is another wheel, the face of which
has slots to receive pawls; this wheel is made broad to answer the purpose of a
drum wheel for braking; it is also made with a centre hole large enough to run
on the end of a boss cast on the carriage or plummer block through which the
shaft runs; this is done to avoid friction. The brake strap is put round this
drum wheel, and with a lever, screw, or other equivalent-suitably-fixed; the-load-
will be sustained.
In order to lower the load the brake is released.
The object of the arrangement described in these improvements is to make an
automatic self-sustaining hoist.
And in order that our said Invention may be clearly understood reference is
made to the accompanying Drawings, wherein similar letters of reference indicate
corresponding parts in the several Figures.
Fig. 1 shows elevations of the brake wheel. 1, 2, 3, 4 and 5 are the loose pawls
in recesses. Fig. 2 is the shaft carriage, the brake running on the projecting
journal ; this is done to lessen the friction which would otherwise be upon the
shaft when the brake is on.
Fig. 3 represents the ratchet wheel which for convenience is cast on the barrel
end as shown in Fig. 4.
a is the
Fig. 5 is an elevation (partly in section) and Fig. 6 is a plan (drawn to a smaller
scale) of a barrel hoist with our improvements. On the left of the plan Fig. 6 is
shown the brake with the levers for slackening and tightening the brake. Fig. 7
represents (partly in section) the lever cam and the brake strap attached.
shaft upon which the barrel b is keyed with the ratchet wheel to face the brake
drum p, and into this the pawls engage, those at the bottom will be in gear, whilst
those at the top will drop out of gear. c is the winding drum. f is an ordinary
V wheel for carrying the pulling rope, and is fixed on the shaft a r and d arc
the carriages. The drum p has the brake i i surrounding it which is held rigidly
by the weight W with the combined force of levers hand k, hinged at 7 and m,
the lever h being fixed at n. Lever o is to raise or lower the brake, a pin being
inserted at x which raises h when the end o is depressed.
In raising a weight on the hoist the load is sustained in any part of the lift by
the brake and ratchet arrangement and will not run down until the lever o is
depressed to release the brake, thereby allowing the barrel and brake drum to
rotate as desired.
Having thus described the nature of our Invention and the manner of performing
the same, we would remark that we do not limit ourselves to the precise details

page_text: herein given as they may be varied and modified without departing from the main
feature of our Invention; we would also state that we make no claim to well
known parts of the mechanism which are shown to illustrate the mode applied to
our improvements, but what we desire to be secured to us is :-
The general arrangement and combination of parts forming respectively our
improvements in hoists and brakes in the manner and for the purposes substantially
as herein before described and shown on the Drawings or any mere modification
thereof.
In witness whereof we the said Jonathan Pickering and Joseph Thompson
Pickering have hereunto set our hands and seals this Twetny sixth day of
June in the year of our Lord One thousand eight hundred and eighty two.
JONATHAN PICKERING.
(L.S.)
JOSEPH THOMPSON PICKERING. (LS.)