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Tham khảo tài liệu 'inspection of vertical transportation equipment_4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http www.simpopdf.com CHAPTER 4 DUMBWAITERS 4.1 INTRODUCTION NOTE Paragraphs identified with a vertical line in the left margin are inspections that should be made by certified Vertical Transportation Inspectors only. 4.1.1 Scope The inspection procedure of dumbwaiters included in this chapter is not only an inspection of all safety related functions but is also an inspection to determine the condition of the equipment and identify areas that need improvement. Proper maintenance is needed to keep the dumbwaiters operating. When preventative maintenance is lacking shut downs will occur. See Figures 4-1 and 4-2 which show various dumbwaiter arrangements with component names that will be used in this chapter. 4.1.2 Special Criteria The size of dumbwaiters are restricted by the A17.1 Code. The requirements for dumbwaiters are considerably different from elevators because the size restrictions are made specifically to prevent people from riding in dumbwaiters. They are made exclusively to carry material. This restriction also reflects on inspection of this equipment. 4.1.2.1 Hoistway Inspection. All hoistway inspections are made from the outside of the hoistway. Hoistway inspections are made by moving the car away from the landing and observing the hoistway through the open door. 4.1.2.2 Machine Room Inspections. The requirements for location of the dumbwaiter hoisting equipment are also quite different from those for elevators. This is a direct result of people not being transported. The A17.1 Code allows the hoisting equipment and control equipment to be located within the hoistway. It will be found that in the majority of installations the equipment will be located in the confines of the hoistway and accessible from access doors. There will be however some incidents when you have walk-in machine rooms. In this section we will use the term machine room to relate to both locations. 4-1 Simpo PDF Merge and Split .