Preventing unauthorized hoistway access

B - Operations – Transporting – 66 – B

Patent

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Details

B66B 5/00 (2006.01) B66B 3/00 (2006.01) B66B 5/28 (2006.01) B66B 13/00 (2006.01) B66B 13/24 (2006.01) E05B 17/14 (2006.01) E05B 19/00 (2006.01) E05B 65/00 (2006.01)

Patent

CA 2459447

The invention relates to a means and method of preventing unauthorized access of personnel into the hoistway of an elevator system. In particular the invention provides a security device (14) for mounting in the vicinity of an auxiliary release mechanism of a sanding door to prevent actuation of the auxiliary release mechanism during normal operating conditions. The security device (14) comprises an energization circuit which, in use, is responsive to changes in operating conditions of the elevator system and may also include an obstruction member (28) movable in response to the energization circuit between a first position preventing key access through a keyhole during normal operating conditions and a second position permitting access through the keyhole during abnormal operating conditions. Accordingly, a key can only be inserted through the keyhole to actuate an unlocking bit of the auxiliary release mechanism to release the landing doors during abnormal operating conditions.

L'invention concerne des moyens et des méthodes permettant d'empêcher l'accès non autorisé de personnel dans des cages d'un ascenseur. En particulier, l'invention fournit un dispositif de sécurité (14) pour le montage à proximité d'un mécanisme de dégagement auxiliaire d'une porte palière pour empêcher l'activation du mécanisme de dégagement auxiliaire pendant les conditions normales d'exploitation. Le dispositif de sécurité (14) comprend un circuit d'énergisation qui, à l'usage, réagit aux changements des conditions d'exploitation de l'ascenseur et qui peut aussi inclure un élément d'obstruction (28) qui peut se déplacer en réaction au circuit d'énergisation entre une première position empêchant l'accès d'une clé dans une entrée de clé pendant des conditions normales d'exploitation et une deuxième position permettant l'accès à l'entrée de clé pendant des conditions anormales d'exploitation. Par conséquent, une clé peut seulement être insérée dans l'entrée de clé pour activer un panneton de déverrouillage du mécanisme de dégagement auxiliaire pour dégager les portes palières pendant des conditions anormales d'exploitation.

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