Abstract: A pivoting tablet on a swivel arm rotating around a seating unit such as a student chair provides a writing or utility surface proximate to a seated occupant that allows the tablet to be pivoted to a comfortable and effective writing position such that the swivel arm allows rotation of the tablet support to enter and exit the chair and allows positioning based on the dominant hand of the occupant. The tablet pivots around a bore in a sleeve attached to an end of the swivel arm, into which a shaft having a protrusion extends. The protrusion engages an annular slot in the sleeve for guiding and limiting pivotal movement. The seat rests on a pedestal defined by a plurality of legs surrounding a rack or platform for books. The pedestal has a column supporting the seat surface, and a collar around the column allows rotation of the swivel arm holding the tablet.

Abstract: A magnetic relay incorporating an electrical interlock function along with a bypass function in which the bypass function needs to be manually set, operates once in a cycle, and is trip free.

Abstract: A heated hair curler has a fast warm-up time and a slow cool down time due to a heater element having a steeply sloped positive temperature coefficient (PTC) of resistivity. The heater is composed of a ceramic like material such as doped barium titanate or a polymer loaded with conductive particles such as polyethylene loaded with carbon black. In one embodiment the heater is shaped in the form of an elongated annulus to fit closely inside a hollow plastic curler shell. Conductive coatings located on the inner and outer peripheral surfaces mate with ring shaped conductors supported in a base. In a second embodiment the PTC heating element which may be in the form of a parallelopiped is located within a sealed cylindrical container, also containing a fusible wax, which in turn fits within the hollow plastic curler shell. The PTC element has conductive coatings on two opposite faces for electrical connection thereto.