Custom Search
|
|
|
||
 6.5.4.3 Hoist Machine. Normal motors are usually AC type with sealed bearings. Check the
motor and drive sheave for evidence of abnormal condition or corrosion. Connection to the
screw drive will generally be "V" belts. Inspect belts for wear and proper tension (proper tension
is about 1/2" deflection at the center with medium thumb pressure). Inspect the screw and nut
(ball). The screw should be clean, lightly greased and show no sign of damage or abnormal
wear. Bearings at the top and bottom of the screw should be properly greased. Check all
connections to be sure they are secure. Verify the machine space is clean and properly painted
with no corrosion. Replace the cover and restore power.
6.6 INCLINED ELEVATORS
6.6.1 Introduction
The rules of Part XVII are applicable to inclined lifts intended for public use. An inclined
elevator is defined as an elevator where the angle of inclination is less than 70 degrees from
horizontal. The Code allows inclined elevators to be driven by traction, winding drum or screw
type drives. The majority of inclined elevators are traction drive type with components
comparable to a standard elevator. Entry will be protected by some type of enclosure; some type
of cab will exist and controls will be provided at landings and inside the car. Your inspection
therefore should be based on principles for examining normal elevator equipment. Two
characteristics of inclined elevator installations should be kept in mind during an inspection.
First, the guide system is usually supported on an elevated structure without a hoistway enclosure
between landings. While inspecting the guidepath, the possibility of falling is substantially
greater than in a conventional elevator hoistway. Second, the guidepath may consist of open
structural supports not unlike an escalator truss. Special care must be taken to secure stable
footing.
6.6.2 Hoistway
Hoistway enclosures must be fire rated only if fire resistant construction of the buildings they
serve is penetrated. If the lowest surface of the inclined elevator guides or moving components
are at least eight feet above the surface below, no enclosure is required. Non fire resistive
enclosures must be at least seven feet high and reject a ball 3/4 inch in diameter. The enclosure
must be located at least 6 inches from moving components. If the enclosure is at least 36 inches
from moving components, the open work can be such that a two inch diameter ball will be
rejected. Openwork enclosure areas adjacent to entrances must reject a inch diameter ball.
6-23
|
 
|
|
|
||
