E - Fixed Constructions – 06 – C
Patent
E - Fixed Constructions
06
C
228/1, 61/2.4
E06C 1/36 (2006.01) E06C 1/34 (2006.01) E06C 9/00 (2006.01)
Patent
CA 1095000
ABSTRACT OF THE DISCLOSURE This invention relates to a specialized ladder for use with a ring-like shield bordering the entryway into a manhole, said ladder being characterized by hook-forming subassemblies depending from the right and left handrails adapted to releasably hook over the upwardly-facing rim of the shield, each such hook subassembly including a hanger member projecting out over the shield rim in overhanging relation to the latter, a downwardly and inwardly inclined tubular slide on the overhanging end of the hanger member and a self-locking latch pin mounted within said slide for automatic free-sliding gravitational movement therein from a retracted unlocked position out of contact with the cylindrical shield wall into an extended latched position resting thereagainst. The ladder also includes a horizontally-disposed stop pin projecting from each handrail cooperating with one or the other of a pair of vertically-disposed pins hanging down from the underside of the hanger member in radially-spaced relation to simultaneously engage the upper rim-encircling flange of the shield and cylindrical inside wall thereof so as to maintain said ladder in a stable more or less vertical position closely adjacent the wall of the entryway.
320922
Johnson Ernest Peter
Pelsue (t.a.) Company
LandOfFree
Manhole shield ladder does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Manhole shield ladder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Manhole shield ladder will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-877097