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Hoistway door locking devices for power dumbwaiters shall comply with 7.1.12.1.1 through 7.1.12.1.3.
7.1.12.1.1
Hoistway door interlocks in conformance with 7.1.12.1.3 are required at all landings, except that hoistway door combination mechanical locks and electric contacts conforming to 7.1.12.1.2 shall be permitted to be used at landings where the bottom of the door opening is 600 mm (24 in.) or more above the floor.
7.1.12.1.2
Hoistway door combination mechanical locks and electric contacts, where provided, shall conform to the following:
(a) requirement 2.12.3.2
(b) requirement 2.12.3.3
(c) requirement 2.12.3.4, except that
(1) requirement 2.12.3.4.4 applies to all types of multisection doors
(2) requirement 2.12.3.4.5 applies, but the force used should be 225 N (50 lbf)
(d) requirement 2.12.3.5
(e) requirement 2.12.4
(f) they shall be arranged so that the hoistway door is locked when the car is more than 75 mm (3 in.) from the landing
7.1.12.1.3
Hoistway door interlocks, where provided, shall conform to the following:
(a) where the rated speed of the dumbwaiter is greater than 0.5 m/s (100 ft/min)
(1) requirement 2.12.2.2
(2) requirement 2.12.2.3
(3) requirement 2.12.2.4, except that
(-a) requirement 2.12.2.4.1 does not apply
(-b) requirement 2.12.2.4.6 applies, but the force used shall be 225 N (50 lbf)
(4) requirement 2.12.2.5
(5) requirement 2.12.2.6
(6) requirement 2.12.4
(b) where the rated speed of the dumbwaiter is less than or equal to 0.5 m/s (100 ft/min)
(1) requirement 2.12.2.2.
(2) the operation of a dumbwaiter driving machine when a hoistway door is not in the closed position (see 2.12.2.2) shall be permitted by a car-leveling device (see 7.2.12.6), a hoistway access switch (see 7.1.12.4), or an anticreep device (see 7.3.11.3). The operation of a dumbwaiter driving machine when a hoistway door is unlocked but in the closed position shall be permitted by a car-leveling device, a hoistway access switch, or an anticreep device, or by the normal operating device when the car is within 75 mm (3 in.) above or below the landing. Hoistway door close contacts (see 7.2.12.31) shall be provided when the driving machine is operated with the hoistway door or gate unlocked but in the closed position. The hoistway door close contacts shall be positively opened by the opening action of the door or gate. They shall be maintained in the open position by the action of gravity or by a restrained compression spring, or by both, or by a positive mechanical means.
(3) requirement 2.12.2.4, except that
(-a) requirement 2.12.2.4.1 does not apply.
(-b) requirement 2.12.2.4.3 does not apply. The interlock shall lock the door in the closed position with a minimum engagement of 7 mm (0.28 in.) of the locking members before the interlock contacts are closed and before the driving machine can be operated except as permitted by (2).
(-c) requirement 2.12.2.4.6 applies, but the force used shall be 225 N (50 lbf).
(4) requirement 2.12.2.5.
(5) requirement 2.12.2.6.
(6) requirement 2.12.4.

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