(a) Dumbwaiter Cars.
(1)
Cars shall be of solid or
openwork construction on all sides except the necessary openings and of such
strength and stiffness that they will not deform appreciably when the load
leans or falls against the sides of the car.
(2) Nonmetal cars shall be reinforced with
metal from the bottom of the car to the point of suspension.
EXCEPTION: Hand dumbwaiters.
(3) Metal car sections shall be riveted,
welded or bolted together.
(4)
The total inside height of the car shall not exceed 4 feet. The inside
net floor area shall not exceed 9 square feet.
(5)
Cars shall be provided with a
platform and a solid car top.
(b) Structural Capacity Load. Driving
machines, car and counterweight suspension means, and overhead beams and
supports shall be designed and installed to sustain the car with a structural
capacity load not less than that specified in Table 3079B, based on the inside
net platform area or the rated load, whichever is greater, with the factors of
safety specified in the respective rules applying to such parts. The motive
power shall not be required to be sufficient to lift the structural capacity
load.
TABLE NO. 3079B
Minimum Allowable Structural Capacity Load
Corresponding to Inside Net Platform Area
Net Platform Area in Square
Feet |
Structural Capacity Load in Pounds |
|
4.......................................................................................... |
100 |
|
5.......................................................................................... |
150 |
|
6 ¼
..................................................................................... |
300 |
|
9.......................................................................................... |
500 |
(c) Rated Load.
(1)
The rated load shall be not more
than 500 pounds.
(d) Capacity and Data Plates.
(1) A metal plate shall be fastened in a
conspicuous place in the car and shall give the rated load in letters and
figures not less than ¼ inch high, stamped, etched or raised on the
surface of the plate.
(2) A data
plate shall be attached inside or on the car top and indicate the following:
(A) Manufacturer's name and date of
installation.
(B) Total weight of
car.
(C) Rated speed.
(D) Wire rope data required by Section
3042(b)(1) for
cabled dumbwaiters.
(E) The outside
diameter and wall thickness of the finished plunger for hydraulic
dumbwaiters.
(F) The height of data
plate letters and figures shall be not less than 1/8
inch.
(e) Car
and Counterweight Safeties.
(1) Car or
counterweight safeties are not required except as specified in Section
3078(g).
(2) Governors and governor actuated safeties
shall be approved as required for elevators in Design Sections
3105 and
3106. A field test shall be
conducted witnessed by a representative of the division.
(3) Safeties actuated by breaking or
slackening of the hoist ropes shall be drop tested on each installation. The
test shall be witnessed by a representative of the division.
(4) The safety device need not be located
below the car or the counterweight.
(f) Driving Machines and Sheaves.
(1) Driving machines shall be located in
machine rooms or machine spaces and shall be one of the following types:
(A) Drum
(B) Traction
(C) Screw
(D) Plunger
(E) Single Belt
(F) Chain Drive
(2) Driving machines and sheaves shall be
designed with a factor of safety, based on the static load (the rated load plus
the weight of the car, ropes, counterweights, etc.) of not less than:
(A) 6 for steel, and
(B) 9 for cast iron and other
materials.
(3) Sheaves
and drums used with suspension ropes shall:
(A) Be of metal with finished grooves, except
that grooves of sheaves not used to transmit power, may be lined with rubber or
other sound isolating material.
(B)
Have a pitch diameter not less than 24 times the diameter of the rope where
used with suspension ropes.
(4) Belts used as the driving means between
the motor and the machine of power dumbwaiters shall comply with the following
requirements:
(A) Where flat belts are used,
the rated speed shall be not more than 50 feet per minute.
(B) Where multiple V-belts are used, the
rated speed shall be not more than 150 feet per minute.
(5) Electric and hand driven machines shall
be equipped with brakes as follows:
(A)
Electric driving machines shall have electrically released brakes applied
automatically by springs in compression or by gravity when the power is removed
from the motor.
(B) Belt drive
machines shall be equipped with a brake located so as to be effective in event
of belt failure.
(C) Handdriving
machines shall be equipped with hand brakes or automatic brakes which will
sustain the car and its rated load. When the brake is applied, it shall remain
locked in the "ON" position until released by the operator.
(6) Hydraulic driving machines shall conform
to Section
3067, except they may be other than
the direct plunger type.
(g) Car and Counterweight Guides and Guide
Fastenings.
(1) Car and counterweight guide
rails for power dumbwaiters shall be of metal of such design and strength, and
so supported as to withstand without undue deflection the loads imposed upon
them under normal conditions of service or upon application of a required
safety device.
EXCEPTION: Dumbwaiters having a capacity of 20 pounds
or less may have guides of wood or spring steel wires maintained in
tension.
(2)
Cars
and counterweights of all dumbwaiters shall run in guides. The same
set of guide rails may be used for both the car and counterweight.
(3) Guides shall be securely fastened to the
hoistway.
(4) Guides for hand
dumbwaiters may be of wood.
(5)
Guide-rail joints shall be either tongued and grooved or doweled and fitted
with splice plates.
(h)
Counterweights. Counterweights may be of sectional construction, supported by
tie rods provided they are secured by at least two tie rods. Tie rods shall
have lock nuts secured by cotter pins.
(i) Means of Suspension and Fastenings.
(1) Cars and counterweights for power
dumbwaiters except those having hydraulic or screw-type driving machines, shall
be suspended by one or more iron or steel wire hoisting ropes or chains secured
to the car or counterweight or rope hitch by babbitted sockets, rope clamps, or
equally substantial fastenings.
(A) Suspension
ropes shall be provided with a rope data tag conforming to Section
3042(c).
(B) Suspension chains shall be provided with
data tags similar to Section
3042(c).
(2) Chains, where used, shall be roller,
block, or multiple-link silent type.
(3) The factor of safety, based on the static
load, of car and counterweight suspension means of power dumbwaiters shall be
not less than the value specified in Table 3079I for the actual speed of the
rope or chain corresponding to the rated speed of the dumbwaiter. The
fastenings for the suspension means shall develop not less than the factor of
safety required for the suspension means.
TABLE NO. 3079I
Factors of Safety for Wire Ropes and for
Chains
Rope or Chain
Speed |
Factor of Safety |
Feet per
Minute |
For Ropes |
For Chains |
|
50.......................................... |
4.8 |
6.0 |
|
100........................................ |
5.2 |
6.5 |
|
150........................................ |
5.5 |
6.9 |
|
200........................................ |
5.9 |
7.4 |
|
250........................................ |
6.2 |
7.8 |
|
300........................................ |
6.6 |
8.3 |
|
350........................................ |
7.0 |
8.8 |
|
400........................................ |
7.3 |
9.1 |
|
450........................................ |
7.7 |
9.6 |
|
500........................................ |
8.0 |
10.0 |
(4) The suspension means for hand dumbwaiters
shall conform to the following:
(A)
Dumbwaiters having a rated load of more than 75 pounds shall be suspended by
steel wire ropes or chains having a factor of safety of not less than 4
½.
(B) Dumbwaiters having a
rated load of 75 pounds or less may be suspended by manila or braided-cotton
ropes having a factor of safety of not less than 6.
(5)
Wire ropes shall not be
lengthened or repaired by splicing.
(6)
The winding-drum ends of car and
counterweight ropes or chains shall be secured inside the drum, and there shall
be not less than one turn of the rope or chain on the drum when the car or
counterweight has reached the extreme limit of its
overtravel.
(j)
Control and Operation of Power Dumbwaiters.
(1) Operation shall be of the automatic or
continuous pressure type.
(2)
Dumbwaiters equipped with winding-drum machines, shall be equipped with
a slack-rope switch which will remove the power from the motor and brake if the
car is obstructed in its descent.
EXCEPTION: Dumbwaiters installed before June 5,
1947.
(3) Operating devices
shall be of the enclosed electric-type.
(4)
When it is intended to
discontinue for an extended period of time, the use of a dumbwaiter, the car
and counterweight shall be landed satisfactorily and the power shall be
disconnected.
(k) Terminal Stopping Devices for Power
Dumbwaiters. Normal terminal stopping devices conforming to the requirements of
Section
3039(a) shall be
provided.
EXCEPTION: The switch contacts shall be directly opened
mechanically. Arrangements which depend on a spring, or gravity, or a
combination of both, to open the switch contacts, shall not be
used.
(l) Hydraulic
Dumbwaiters. Valves, supply piping, fittings and tanks for hydraulic
dumbwaiters shall conform to Sections
3068 and
3069. (Title 24, Part 7, Section
7-3079)
Notes
Cal. Code Regs. Tit. 8, §
3079
1.
Amendment of subsection (f)(3), repealer and new subsection (j) filed 6-23-77;
effective thirtieth day thereafter (Register 77, No. 26).
2. New
EXCEPTION to subsection (k), statement prior to NOTE and NOTE filed 3-9-93;
operative 4-8-93 (Register 93, No. 11).
Note: Authority cited: Section
142.3, Labor
Code. Reference: Section
142.3, Labor
Code; and Section
18943,
Health and Safety Code.
1. Amendment of
subsection (f)(3), repealer and new subsection (j) filed 6-23-77; effective
thirtieth day thereafter (Register 77, No. 26).
2. New Exception to
subsection (k), statement prior to Note and Note filed 3-9-93; operative 4-8-93
(Register 93, No. 11).
Group II regulations apply to existing
elevators installed prior to October 25, 1998. Italicized paragraphs,
sentences, or phrases apply to all existing elevators while non-italicized
apply to elevators installed after 1970 or after the date the regulation was
adopted.