The Providence news. (Providence [R.I.]) 1891-1906, 1895-05-14
CONTROLLING The ELEVATOR.
The New Hardness Safety Device at
City Hall.

The latest addition for the accumulation or
the public at the city hall Is the Hardness
Safety Controlling Device and Corridor Door
Attachments for controlling the elevator and
securely locking It in its position while the
corridor door is open. These devices are new
in principle and secure results that have been
the desire of the elevator people for many
years Mechanical experts and elevator people
of this and other cities state that this con-
trolling device is the most perfect In Its action
and results of any mechanism for controlling
elevators that is now in existence. These de-
vices are patented in England, France, Ger
many and other foreign countries, as well as
in the United states.
The corridor door attachments are most
valuable for the safety of passengers, as they
are positive in their action, locking the car In
its position the moment tho corridor door is
opened, thereby rendering 1t impossible for
the attendant TO start the car in either direc-
ton until the passenger has entered or left the
car and the corridor door has been closed.
Nearly every one has experienced the dis
agreeable sensation of having the elevator
Started before he has fairly entered or left 1t.
| Such an occurrence is impossible with these
| devices These door attachments, by the
| locking of the car also prevent what is called
4
! shifted, thereby neutralizine the movement of
| the car. In the majority of other devices for
| locking the elevator when the corridor door
| il omen, one OF two things occurs If door
| should be open while the elevator is In mo-
tion either the control of the car IL taken
| AWAY from the attendant, making 1t impos-
| sible TO stop IL, or something is compelled to
| break. With the Hardness devices, If door
| should be opened, wilfully or otherwise, the
| elevator is brought TO a stop upon reaching
that point, without shock and the door must
be closed before the elevator can proceed.
Those devices have no electrical connections,
hut are purely mechanical, although electric
elevator plants may be operated by them a.
satisfactorily as hydraulic or steam plants.
The most important points claimed fol
these devices are:
THE uARKNEss SAFETY CONTROLLING DEVICES
1. Acts directly upon the main valve, doinI
away with pilot or secondary valves and at
tendant expenses.
2. Elevator responds instantly, no lost tim
between application of power and movemen
of car.
3. Inside mechanism is not in motion, OK
cent when car is being started or stopped b.
attendant.
q.
b attendant, stops can be made at exact level G
corridor floor.
: ~ coNsrcrloS WITH CORRIDOR DOOR Al
TACHMENTs.
4 Elevator nj landing is locked in plaC
the instant corridor door commences 20 opei
q. Elevator at landing cannot bo starte
until corridor door Is closed.
n :. Elevator at landing cannot creep wit
n corridor door open.
= &. Elevator attendant cannot leave corrid'
= door Unmatched for the mechanism compels /
n closing before starting.
" o. Operates upon two or more corrid
: doors on same floor level, but different sid
y Of shaft.
"a The II. W. Ladd Company secured the hr
u Hardness device placed in this city, which h
!. now been in constant use for over Gig
months, giving perfect satisfaction.