Vertical Materials Handling Systems aka Dumbwaiters

Once a simple hoist mechanism, the dumbwaiter is now the smart, efficient, safe and economic solution for moving materials from one floor to another.
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PART 2 - PRODUCTS

2.1 Manufacturer

Name of manufacturer

2.2 Product Type

A. Model shall be the commercial traction dumbwaiter

B. Car shall have clear inside dimensions of ________ inches wide x _______ inches deep x ________ inches high, and have one removable shelf. Capacity to be ________ pounds. Dumbwaiter to serve _______stops and ___________ openings, located on ( ) same, ( )opposite, ( ) adjacent side(s) of the hoistway. The car shall stop at ( )counter-height or ( ) floor level. The travel distance shall be ____________ feet. Power supply shall be _______volt, 3 phase, ___________ hertz.

C.All equipment shall be manufactured in accordance with the latest edition of the ANSI 17.1 code for elevators, escalators, and dumbwaiters.

2.3 Fabrication

A. Car Enclosure: The car shall be constructed of 16 gauge ( ) #4 satin polished stainless steel or ( ) carbon steel with a prime finish. Car shall have one removable shelf. An electrical light fixture shall be recessed in the ceiling. Floor loading models shall have a reinforced floor.

B. Car Gates: The car shall be equipped on each open side with a gate matching the car construction and finish. The gate shall be vertical ( ) bi-parting or ( ) slide up design. Car gate(s) shall be manually operated unless power operation is specified.

C. Guide Rails: Steel channel rails 2 7/8"wide x 1 3/4" deep and 1/4" flange shall be furnished to guide the car. Guide rails shall be mounted to the floor slabs and hoistway wall with steel brackets.

D. Machine: Machine shall be the traction type. Motor shall be of ample horsepower to lift the rated load at the rated speed, with a high starting torque and low starting current. It shall be equipped with a spring applied and electrically released brake. Machine shall be located at the top of the hoistway and mounted on structural steel base. The traction sheaves shall be semi-steel, with machine grooves designed to provide adequate traction, and long cable life.

E. Controller: Controller shall be wall mounted type with lockable door, located on hoistway outer wall in sight of machine access door. Controller shall be solid state programmable and Underwriter's Laboratories, Inc. listed.

F. Operational Control: Operation shall be automatic call and send. A pushbutton station with one button for each level served, shall be furnished at each door. It shall be possible at each level to call the car or send it to any other level. Pushbuttons shall be inoperative while car is in transit, and for a few seconds after arrival at the selected level. Pushbuttons shall have stainless steel faceplates.

G. Signals Devices:

  • "Door Open" call buzzer shall sound when a pushbutton is pressed and a hoistway door or car gate is open.
  • "Car Here" light and chime - shall be located in each pushbutton station. Chime shall indicate car arrival. Light shall indicate car presence.
  • Combination "Door Open" and "In-Use" light - shall be located in each pushbutton station. Light will illuminate when car is in transit and when a pushbutton is pressed and a hoistway door or gate is open.


Traction Dumbwaiter

H. Leveling Accuracy: If the car stops above the floor level, car floor shall be no more than 1/2" above or below the level of the hoistway door sill. If car stops at floor level, car floor shall be no more than 1/4" above or below the level of the hoistway door sill.

I. Hoist Ropes. Minimum (2, 1/4" x 3 x 19) traction steel cable with safety factor per code.

J.Final Limit Stopping Devices: Provide per code

K. Guide Shoes: Guide shoes shall be adjustable, renewable dry type.

L. Hoistway Doors: Door shall be vertical sliding ( ) bi-parting or ( ) slide up design. Each door shall bear the Underwriters "B" label and shall be rated for application in;(a) masonry shaft or (b) metal stud drywall shaft. Hollow metal door panels shall be 16 gauge ( ) stainless steel with satin polish & No. 4 finish or ( ) carbon steel with prime finish. Welded unit wall frame, including jambs, trim and sill shall be; 16 gauge ( ) stainless steel with satin polish & No. 4 finish or ( ) carbon steel with prime finish. Doors shall be manually operated unless power operation is specified. A door lock and contact shall be provided on each door.

M. Machine Access Door: Hinged access door shall be 24" w x 24" h and shall be furnished at machine location for service and maintenance. Access door shall be 16 gauge ( ) stainless steel with satin polish & No. 4 finish or ( ) carbon steel with prime finish.

N. Counterweight: The counterweight shall be equal in weight to that of the car plus 40% of the rated capacity.

O. Drawbridge (Optional): Floor loading models with bi-parting door and car gates shall be equipped with drawbridge to provide smooth entrance for wheeled carts. Drawbridge shall be raised and lowered by opening and closing of car gate.

P.Self-Supporting Tower (Optional): Components shall be carried on a self-contained, rigidly braced, structural steel angle tower. Tower must be braced by building structure.

Q. Power-Operated Hoistway Doors and Car Gate(s) (Optional): Car gate(s) shall be motorized, and shall be equipped with magnetic clutch assembly which shall power operate the hoistway doors.

 

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Originally published in Architectural Record.
Originally published in May 2005

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