Piezoelectric film load cell robot collision detector
March 15, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesPiezoelectric key board switch Polymeric piezoelectric key actuated device Force and torque sensing method and means for manipulators and the like Pressure sensitive switch Force sensor Six-axes manipulator Piezoelectric polymeric film occlusal force indicator Polymer piezoelectric sensor of animal foot pressure Weight sensing apparatus employing polymeric piezoelectric film Composite, multifunctional tactile sensor InventorAssigneeApplicationNo. 07/168367 filed on 03/15/1988US Classes:73/862.68, By measuring electrical properties310/338, Force or pressure measuring type310/800PIEZOELECTRIC POLYMERS (E.G., MYLAR, PVDF)ExaminersPrimary: Ruehl, Charles A.Attorney, Agent or FirmInternational ClassesB25J 19/06 (20060101)G01L 1/16 (20060101) AbstractA piezoelectric load cell which can be utilized for detecting collisions and obstruction of a robot arm end effector includes a force sensing element of metallized polyvinylidene fluoride (PVDF) film. The piezoelectric film sensing element and a resilient support pad are clamped in compression between upper and lower plates. The lower plate has a central recess in its upper face for supporting the support pad and sensing element, while the upper plate has a corresponding central projection formed on its lower face for bearing on the sensing element and support pad. The upper and lower plates are dowelled together for concentric alignment and screwed together. The upper and lower plates are also adapted for mounting between the robot arm wrist and end effector.Field of SearchBy measuring electrical properties | |
