Retractable ladder
OwnerRichard C. BLASKAinventor
Life of this patent
Estimating the term…
Abstract
A retractable ladder assembly for use in an elevator pit is disclosed. The retractable ladder assembly includes a ladder having spaced-apart parallel stiles coupled together via a plurality of stacked horizontally-disposed rungs. At least one pivot arm having a first end is coupled to the ladder. A second end of the pivot arm is adapted for coupling to a wall in the pit. The ladder assembly further includes a lift assist mechanism having a first end coupled to the ladder, and a second end for coupling to the wall. The lift assist mechanism is operative to assist in manually pivoting the ladder to a retractable state.
Claims20
A retractable ladder assembly for use in an elevator pit, the retractable ladder assembly comprising:
- a ladder having spaced-apart parallel stiles, the stiles coupled together via a plurality of stacked horizontally-disposed rungs;
- a pivot arm having a first end coupled to the ladder, and a second end for coupling to a wall in the pit;
- and
- a lift assist mechanism having a first end coupled to the ladder, and a second end for coupling to the wall, the lift assist mechanism operative to assist in manually pivoting the ladder to a retractable state.
A ladder assembly comprising:
- at least one stile formed with a deployment hole;
- a deployment arm;
- and
- a deployment mechanism mounted on the deployment arm and coupling the deployment arm to the deployment hole, the deployment mechanism including
- an operating handle, and
- a pin configured to detachably engage the deployment hole in response to an activation of the operating handle.
A retractable ladder assembly for use in an elevator pit, the retractable ladder assembly comprising:
- a ladder having spaced-apart parallel stiles, the stiles coupled together via a plurality of stacked horizontally-disposed rungs;
- at least one pivot arm having a first end coupled to the ladder, and a second end for coupling to a wall in the pit;
- and
- an electrical safety switch mechanism comprising
- a hinge pivot arm coupled to one of the stiles, and
- a switch including a biased plunger configured to slidably engage the hinge pivot arm to actuate the switch.
Dependencies are inferred from the claim text.