IMPROVEMENTS IN BRAKING OR SAFETY APPARATUS FOR HOISTS AND OTHER LIKE PURPOSES
Year: 1885

page_text: I, ROBERT ATWOOD BEAVER of 8 Old Hall Street Liverpool in the County
of Lancaster, Merchant do hereby declare the nature of my invention for
IMPROVEMENTS IN BRAKING OR SAFETY APPARATUS FOR HOISTS AND OTHER LIKE
PURPOSES" to be as follows:-
E
This Invention has for its object a safety apparatus which applied to the shaft
carrying the drum or pulley round which the cage balance rope or chain passes will
regulate and control the speed of descent or ascent in case of an accident to the
hoisting machinery.
The invention consists in placing a brake on the shaft controlled by a governor
on or connected with the said shaft so that if the shaft begins to revolve too
rapidly the governor balls will fly out and by means of links put the brake on.
This can be done in any usual manner either by a band and right and left hand
screws through the eyes, by simple leverage on the tail of the band or by switching
on bydraulic electrical or other power. The governor can also be of any ordinary
variety even the hydraulic; but I prefer the ordinary ball governor normally held
to the off brake position by the weight of the balls or if horizontal by a spring,
counterweight or its equivalent.

page_text: •
other nike Purposes.
I, ROBERT ATWOOD BEAVER of 3 Old Hall Street, Liverpool, in the County of
Lancaster, Merchant do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement:-
This invention has for its object a safety apparatus which applied to the shaft
carrying the drum or pulley round which the cage balance rope or chain passes will
regulate and control the speed of descent or ascent in case of an accident to the
hoisting machinery.
The invention consists in placing a brake on the shaft controlled by a governor
on or connected with the said shaft so that if the shaft begins to revolve too
rapidly the governor balls will fly out and by means of links put the brake on.
Referring to the drawings-
Figure 1 is an end view and
Figure 2 section through y-z of Figure 1.
In these A is the balance rope carrying balance weight of hoist and passing
over V-pulley B. B pulley keyed to shaft D and carrying balance rope A.
C, C, C¹, governor of any ordinary description on or synchronously connected with
shaft D in such manner that the speeds of revolution of shaft D, and of governor C
must always have one uniform ratio the one to the other. In the drawing, I have
shown governor C as keyed to and rotating at the same angular speed as shaft D.
Shaft D is supported in bearings D¹, D², fixed in brackets on walls or stationary
beams. To the sliding collar C₁ of the governor the links P, P, are pivoted. These
links are linked at their other ends to arms E E. These arms are keyed to a
spindle F having right and left hand screwed ends G and a central bearing in
bracket G. H is a bracket fixed to beam H¹ and carrying the spindle F by means
of bracket Gand shaft D by means of bearing D¹ and spindle I hereafter described
by means of bearing I¹ and nut I. Spindle I is firmly fixed to bearing I¹ by being
slightly larger in diameter than the bearing on one side and being fastened by
nut I at the other. The screwed ends of spindle G screw similarly into screwed
boles in two brake blocks J, K. L is an annular flange on wheel B with cylindrical
turned interior surface against this the brake blocks J, K are pressed by the
screws G, arms E, E and links P whenever the governor going too quick draws
back said links sufficient.
The mode of action in case of fracture of the hoisting rope or its apparatus
neither of which are shown in the drawing is as follows:-
The weight in the hoist causes it to descend with rapidly increasing speed. The
speed of the balance rope and therefore the wheel B and shaft D are consequently
similarly increased and the governor attached to or worked from shaft D is brought
into action. It in turn draws back links P and arms E, and thus revolving shaft G
with its right and left hand screwed ends in the brake blocks forces the brake

page_text: blocks against flange L, and thus puts the brake on wheel B thus preventing the
latter from turning at a quicker speed than that allowed by the governor. By
this means the hoist is allowed to descend at little greater speed than its
normal one.
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. The improvements in braking or safety apparatus for hoists and other like
purposes, which consists in fitting a brake controlled by a governing mechanism
to the hoist in such manner that if the shaft of the hoist to which the brake is
connected revolves too rapidly the governing apparatus puts on the brake, and
slackens the speed substantially as described.
2. The safety braking apparatus, substantially as herein and for the purposes
described.