Combination lock with override key
AssigneeDigilock Asia Ltd.
InventorsAn Zhang, Asil T. Gokcebay
Life of this patent
Estimating the term…
Abstract
A combination lock, such as a dial combination cam lock, has a mechanical key override, the mechanical key extending through the manual knob of the cam lock. For a lost mechanical key situation, or to change the mechanical key, a special key or device can be inserted to enable the knob and key core or plug to be rotated to a further position not normally available. In this position the key, knob and core can be removed, then replaced with a different key and core, preferably using the same knob.
Claims4
A combination cam lock with a mechanical override key that enables override of a mechanical combination access device of the lock, comprising:
- a cam lock housing suitable for mounting in a locker door or other openable panel,
- said mechanical combination access device being at the front of the housing, with means for entry of a specific number combination by a user for normally accessing the lock,
- a rotatable knob or handle on the lock housing, with rotation permitted when a proper number combination has been entered using the mechanical combination access device, the rotation of the knob or handle being effective to rotate a cam at rear of the housing to open the lock,
- the knob or handle having a key slot for receiving a key extended through the key slot, and with a core or plug inside the lock, behind the knob or handle and engaged with the knob or handle at an inner side of the key slot and positioned to receive the key, so as to permit rotation of the knob or handle and core or plug using the override mechanical key, thus to rotate the cam and gain access,
- the core or plug having means for permitting rotation of the knob or handle to a removing position, only when a special mechanical key or device is inserted into the lock, enabling the core or plug with the knob or handle to be pulled out and removed, and
- means connecting the knob or handle to the core or plug so as to be capable of disengaging the knob or handle from the core or plug when removed, for attachment of the knob or handle to a replacement core or plug.
A combination cam lock with a mechanical override key that enables override of a mechanical combination access device of the lock, comprising:
- a cam lock housing suitable for mounting in a locker door or other openable panel,
- said mechanical combination access device being at the front of the housing, with means for entry of a specific number combination by a user for normally accessing the lock,
- a rotatable knob or handle on the lock housing, with rotation permitted when a proper number combination has been entered using the mechanical combination access device, the rotation of the knob or handle being effective to open the lock,
- an override mechanical key,
- the knob or handle having a key slot for receiving a key extended through the key slot, and with a core or plug inside the lock, behind the knob or handle and engaged with the knob or handle at an inner side of the key slot and positioned to receive the key, so as to permit rotation of the knob or handle and core or plug using the override mechanical key, thus to rotate a cam and gain access,
- the core or plug including removal means for enabling retraction and removal of the core or plug on the insertion of a mechanical release device, and
- means connecting the knob or handle to the core or plug so as to be capable of disengaging the knob or handle from the core or plug when removed, for attachment of the knob or handle to a replacement core or plug.
Dependencies are inferred from the claim text.