Evening star., 1912-01-08

least two hosting ropes attached thereto. and
Connection ss With the C ele1stsr All ropes shall Be
independently fastened to their terminals
On traction elevators there shall not oe iess
capacity i is 2soo pounds or lees. and ak rope.
from the car when the rated capacity Is greater
Eauaisers All hoist ropes shall have evensrs
or equalizers on the top Of car frame; car ccun
end. and drum counterweisht ropes shall b pro
vided with equalisers on the counterweieht emo.
Bar equalizers for car or er-baiancs on
traction elevators are not required. but adJust.
able shackles which readily admit of turning OF
cables are to be provided.
of sheaves and cables and drums are given in
Size Of Minimum Diameter Maximum Load on
s-'s !.ss !"ss !sss:: !sss::: ssss ssss$: ssss$:
: inch inch = inches inshs.. 100 pound: pounds.
The above data is intended Tor PASSENGER ele-
vators and the ropes must be standard iron
Ss Of
but where rare exceptions exist. steel ropes VIII
FREIGHT ELEVATORS.
POWER DRIVEN.
SHAFTWAY.
Motor Room. Elevator machinery shall be lo-
suitable lighting facilities.
Pit. Same requirements as for Passenger Ele-
Bumpers. Power-driven freight elevators shall
be provided with two-cushion springs OF approved
type. resting on steel framework or masonry at
cient height to- stop the car and its load. should
It run beyond the bottom limit Of travel. where
shall be provided on its bottom.
Enclosures. In all buildings In the District q
Columbia IN the course OF construction and In .ii
buildings having elevators Intended for freight
lifts only and not constructed, protected, and
operated AZ required for passenger elevators. 1t
hoisting materials. ETC., in any such building or
buildings unless the well holes or openings for
Of the building " shall % be @ enclosed to- to height cf
at least six feet with no opening greater than
21a": and have semi automatic doors or gates at
than m. By semi i-automatic gates or doors y
is meant to provide gates or doors which Will
landing suehr other safety % or equivalent sppIi.
ances as the Inspector OF Buildings may deter
mine min ito, to Be- for the protection OF he
The doors at the sidewalk level Of sidewalk
elevators shall be Of wrought iron or steel. and
open. for the proper ' protsctisn Of the public.
Where such elevators are located within a build
ing spsour shall Ss
be completely enclosed; and each door opening to
car shall be provided with a switch and lock
similar to those provided for automatic eleva-
Sills. Same Tor Passenger Elevators)
Guides. The same requirements for guide
rails for passenger elevators apply to freight eIe.
vstors when when operated By ., poMsr except % that hat
mitted. Wali climber type Of rail construction
will be permitted only for dumbwaiters.
All guide rails shall bottom on solid founda-
tions Of either steel or masonry
Overhead sIs Supports All hosting MACHINERY for %
masonry or steel foundations both from the
base Of building; such apparatus will not be
from wood ceiling or wood noor beams.
Overhead Gratings. Same requirements for
to power freight elevators except that the srst-
ing may he omitted iu the case of the carriage
type Of elevators suspended BY four cables, one
ing machinery is not 'ecated overhead
skylisht; tssme requirements as for Passenger
MACHINE.
Bed Plate: tSame as for Passenger Elevators! !!
Drums. Machine chased drums shall be used
being provided for each cable, except In the case
Of electric dumbwaiters with a capacity of 200
pounds or less where friction sheaves with nifty
1--WE degree angles between the nanges will be
permitted. All sheaves and drums when at-
tached to shafts shall be secured in proper key
Motor All motors for electric elevators shall
be provided with two bearings for the armature
Factor Of Safety. Factor Of safety shall not be
less than i've for any part Of the apparatus OF
Load Test. Each power freight elevator ma
chine shall be subject to load test Of It's rated
capacity, such test to be made by the contractor
not later than fifteen days after the car is put
CONTROLLER AND WIRING.
Control, Type of. Either car switch or mechan-
icsl type Of control will be permitted on power
freight elevators.
Wiring. Same as for PASSENGER Elevatos1
cult breakers will be required electric freight
elevators where car switch control electrically
BreaIers', under passenger Eievatorso
Limits. All freight elevators when operated BY
power shall be provided with approved upper and
slack Gable. Where electric power is applied.
freight machines shall be provided with slack
cut of and the brake applied upon the hosting
cables becoming slack csy Or parting
Speed (same as for Passenger Elevatore)
Capacity Plate. tSame as for Passenger Eleva-
warning Sign. All freight elevators shall have
a notice conspicuously painted thereon a
metal sign securely attached thereto SO as to
r. spfSs 5fss On rHs II AZ DO IS At
THEIR OWN RISK, which notice shall always
be ne on all Of this ea.s
device on power freight elevator cars. other than
those employing car switch control. shall be 80
located that II will not lie necessary for per
safetfes All freight elevators under $50 feet
per minute. except those OF the plungcr type,
sidewalk lifts. and carriage lifts suspended By
four cables at each corner OF the platform.
Dc on tSe ot he
$50 per minute the same requirements as for
passenger elevators shall apply.
platforms shall be covered with sheet metal ex-
cept those of freight elevators running In open
hatchways An open ha tohway 10 defined - one
which Is open to the ceiling on more than one
side. "
Countefweights for power freight elevators
shall have ct least two bolts through all filters
or subweights, unless counterweights are built
in steel frame In an approved manner.
Counterweights shall be adjusted to strike bot
tom before csr reaches ,s overhead work; ana vice
travel in single pair Of guides. bumpers may
be required to reduce the clearance between the
weights. In such u case the drum counterweisht
shall travel below the car counterwefght
CABLES.
Number. All power freight elevators shall have
at least tgo cables supporting the car and tvo
independently fastened At their terminals.
Material. There shall be no hemp or manila
rope used. except for operating rope on hand
weight rope on dumbwsiters that have a car
platform area Of not more than i've square feet
and travel not more than thrty-nve feet The
Size The allowable load for the various sises
Size Of Maximum Load on
Rope. One Rope.
y inch. LOO pounds.
9-16 inch. 1850 pounds
g inch. LOO pounds.
{ inch. 1900 pounds
] inch. 1000 pounds.
For freight elevators below 100 feet per min
ute t%entyaye 1 ~ per .-t.d cent more load 'nan 'ne
Equalisers. tsame for Passenger ElevatorsD
FREIGHT ELEVATORS.
HAND POWER.
SHAFTWAY.
Enclosures. tSame as for Power-Drven Freight
ElevatWs.)