Elevator pit ladder apparatus
AssigneeMitsubishi Electric Corporation
InventorHironobu Kamada
Life of this patent
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Abstract
A mechanism that allows a ladder to be moved to either a use position or a retracted position. The ladder can be moved from the retracted position to the use position with a minimal effort, and the ladder moves by itself from the use position to the retracted position. A pit ladder apparatus for an elevator according to the present invention includes a position change means to be provided in a fixing metal frame fixed to the hoistway and allowing a ladder to be moved to either the use position when the ladder is used or the retracted position for retracting the ladder when it is not used so as not to interfere with operation of the elevator.
Claims16
A pit ladder apparatus for use in a hoistway of an elevator to access between an elevator hall and a pit, the pit ladder apparatus comprising:
- a ladder;
- and
- a position change means to be fixed to the hoistway, the position change means for moving the ladder to either a use position where the ladder is used or a retracted position for retracting the ladder when not used so as not to interfere with operation of the elevator, the position change means including a counter weight and one or more mounting arms that are supported so as to swing freely in a seesaw manner,
- wherein the ladder is mounted to one end of each of the mounting arms, the counter weight is mounted to the other end of each of the mounting arms, and a moment on a side of the counter weight is set larger than a moment on a side of the ladder.
A pit ladder apparatus for use in a hoistway of an elevator to access between an elevator hall and a pit, the pit ladder apparatus comprising:
- a ladder;
- and
- a counter weight and one or more mounting arms that are pivotally supported to move the ladder to either a use position where the ladder is used or a retracted position for retracting the ladder when not used so as not to interfere with operation of the elevator,
- wherein the ladder is mounted to one end of each of the mounting arms, the counter weight is mounted to the other end of each of the mounting arms, and a moment on a side of the counter weight is set larger than a moment on a side of the ladder.
Dependencies are inferred from the claim text.