Adjustable construction preferably an article of furniture...

Details Adjustable construction preferably an article of furniture... Adjustable construction preferably an article of furniture...

2006-05-23

2006-05-23

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S328000

Reexamination Certificate

active

07049728

ABSTRACT:
In adjustable structure with a drive unit (8), e.g., an actuator driven by an electric motor and controlled via a control unit, a jamming protection arrangement is needed in certain connections. A solution is provided to a jamming protection arrangement, based on a piezo element (20) incorporated in the structure, alternatively in the drive unit. The piezo element is connected with the control unit, which is constructed such that the drive unit is stopped or reversed if a deviation occurs in the force on the adjustable element (5) or the structure.

REFERENCES:
patent: 3830103 (1974-08-01), Andrejkovics et al.
patent: 6799523 (2004-10-01), Cunha
patent: 19957187 (2001-05-01), None
patent: 63-251368 (1988-10-01), None

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