Year: 1887

page_text: Date of Application, 2nd Dec., 1887
Complete Specification Left, 1st Sept:, 1888
Complete Specification Accepted, 5th Oct., 1883
I, SAMUEL GREEN BENNETT, of Tresleigh, Ox Hill Road Handsworth in the
County of Stafford Engineer do hereby declare the nature of this invention to be as
follows:-
The object of this invention is to secure absolute safety to hoist or lifts in case of
any accident arising from the winding apparatus whether such accident arises from
a burst cylinder or in the case of the cylinder being accidentally charged with air
or any other cause. When the cylinder is charged with air it would probably elevate
the hoist but the air being suddenly released by opening the valve, the hoist would
immediately fall, and it is one of the objects of this invention to prevent such
accidents arising.
In order to carry out my invention I place on the top of the cylinder attached to
the elevator belonging to any hoist or in any other suitable position so that it com-
municates therewith, a small cylinder or cataract, the pressure end of which is in
communication with the interior of the above mentioned large cylinder. The opposite
end of this cataract is open to the atmosphere. A small piston works inside this
cataract, the underside of the piston being subjected to the pressure of the main
cylinder. To the top side of the said piston, a chain, lever, or other connection
is attached, which communicates with and actuates a catch. This catch engages
with the teeth of a ratchet wheel fixed on a drum.
:
This drum is loosely mounted on a spindle and is actuated by means of toothed
gearing from the elevator, being driven by a dog or driver which is keyed on the
above mentioned spindle and at the opposite end. The drum is employed to wind
the light chain I use in my invention for which I obtained provisional protection on
28th of September 1887, for "Improvements in the construction of Hoists or Lifts
the number of my provisional protection being No. 13111. It is of course obvious
that the said appliances could also be utilized for any combination of hoist with
movable catches, or steps, either as described in my said invention, or any other
method requiring to be actuated or moved to secure the safety of the said hoist.

page_text: The invention works in the following manner.
When the fluid pressure inside the
cylinder of elevator works the said elevator, at the same time it imparts motion to
the small piston of the cataract, which motion being transmitted to the catch causes
it to become disengaged from the teeth of the ratchet wheel fixed to drum above
referred to. This allows the said drum to be operated upon by means of the toothed
gearing of the elevator. So long as the fluid pressure continues to operate the
hoist the said catch remains out of gear and allows the drum to revolve. When
however the fluid pressure fails either owing to the bursting of the cylinder, or
the cylinder being charged with air and suddenly liberated from pressure, the piston
of the cataract being weighted or adjusted by springs immediately falls into its
normal position, and by so doing brings the above mentioned catch into gear with
the teeth of the ratchet wheel fixed to drum, which thus prevents the drum from
revolving and stops the winding of the light chain which actuates the striking gear
described in my former specification No. 13111 above mentioned or any other
arrangement which operates to produce a similar result.
Dated this 30th November ISSZ

page_text: improvements in the Construction Of Hosts and LitS.
I, SAMUEL GREEN BENNETT of Tresleigh, Ox Hill Road, Handsworth in the
County of Stafford, Engineer 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:-
The object of this invention is to secure absolute safety to hoists or lifts in case of
any accident arising from the winding apparatus whether such accident arises from a
burst cylinder, or in the case of the cylinder being accidentally charged with air, or
any
other cause-
-When the cylinder is charged with air it would probably elevate the
hoist, but the air being suddenly released by opening the valve, the hoist would
immediately fall and it is one of the objects of this invention to prevent such accidents
arising.
In order to carry out my invention I place on the top of the cylinder attached to
the elevator belonging to any hoist or in any other suitable position so that it
communicates therewith, a small cylinder or cataract, the pressure end of which is in
communication with the interior of the above mentioned large cylinder. The opposite
end of this cataract is open to the atmosphere. A small piston works inside this
cataract, the under side of the piston being subjected to the pressure of the main
cylinder. To the top side of the said piston a chain, lever, or other connection is
attached which communicates with and actuates a catch. This catch engages with the
teeth of a ratchet wheel fixed on a drum. This drum is loosely mounted on a spindle
and is actuated by means of toothed gearing from the elevator, being driven by a dog
or driver which is keyed on the above mentioned spindle and at the opposite end.
The drum is employed to wind the light. chain I use in my invention for which
I obtained provisional protection on 28th September 1887 for Improvements in the
construction of Hoists or Lifts" the number of my provisional protection being
No. 13111-It is of course obvious that the said appliances could also be utilized for
any combination of hoist with movable catches, or steps, either as described in my said
invention or any other method requiring to be actuated or moved to secure the safety
of the said hoist.
The invention works in the following manner. When the fluid pressure inside the
cylinder of elevator works the said elevator, at the same time it imparts motion to the
small piston of the cataract, which motion being transmitted to the catch causes it to
become disengaged from the teeth of the ratchet wheel fixed to the drum above
referred to. This allows the said drum to be operated upon by means of the toothed
gearing of the elevator. So long as the fluid pressure continues to operate the hoist,
the said catch remains out of gear and allows the drum to revolve. When however
the fluid pressure fails either owing to the bursting of the cylinder, or the cylinder
being charged with air and suddenly liberated from pressure, the piston of the cataract
being weighted or adjusted by springs, immediately falls into its normal position, and
by so doing brings the above mentioned catch into gear with the feeth of the ratchet

page_text: wheel fixed to drum, which thus prevents the drum from revolving, and stops the
winding of the light chain which actuates the striking gear described in my former
specification No. 13111, above mentioned or any other arrangement which operates to
produce a similar result.
The details of my said invention will be further ascertained by reference to the
accompanying drawings in which Fig. 1 is a side view of elevator, Fig. 2, a plan of
same, Fig. 3 an end view, partly in section, Fig. 4 separate view of ratchet wheel
& catch or pawl, Fig. 5 separate view of driver or dog, Fig. 6 enlarged view of
cataract cylinder, Fig. 7 side view of pawl and spindle. Fig. 8, plan. of same.
Fig. 1, is a general view of elevator for which Letters Patent were taken out by me
3rd July 1885 No. 8065. On the top of the cylinder or in any suitable position
I place the small cylinder or cataract a, the pressure end being in communication
with the interior of the large cylinder. The piston which is shown at b is generally
tubular to allow it to be weighted as required. To the piston is attached the chain,
rods, or the rope c which work over the pulley d. The other end of the chain, etc., is
attached to the catch e which engages with the teeth of a ratchet wheel f. The
ratchet wheel is fixed on the drum g. This drum is loosely mounted on a spindle h
and is actuated by means of the toothed gearing, being driven by the dog or driver k
which is keyed on the spindle at the opposite end from the ratchet wheel f.
The drum g is used for winding the light chain l, and this light chain is employed
in raising and lowering the striking gear for actuating the safety steps as described in
my Patent No. 13111 as above stated.
It is evident that the intermediate safety gear as above described can be employed
in connection with any elevator, and can be fixed in any position.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed 1 declare that what
I claim is
1. The use of an intermediate safety arrangement as generally described in the
foregoing specification and drawings, or any modification thereof embodying the
principle of the invention, which can be attached to the elevator as drawn, or to any
other elevator, and in any position.
2. The construction and use of the small cylinder or cataract a, with the piston b
for the purpose described.
3. The combination of the cataract a, the piston b, chain, rods, or rope, c, the catch
or pawl e, the ratchet wheel f, and the dog or driver /, with the drum .
4. The general arrangement of the parts mechanically fitted together as described
in drawings and specification.
Dated this 29th day of August 1888.