1. A security apparatus for blocking unauthorized access for a ladder that is supported on a column structure, the apparatus comprising
a retaining collar conforming to the shape of the periphery of the structure and having a separable portion with a coupling thereon for attaching the collar to the structure;
a plurality of frusta-conical segments each having an upper portion, a bottom portion and radial edges, with each upper portion having means for attaching to said collar, and with each bottom portion extending radially downwardly at an angle ranging from about 25 to about 45 degrees from said collar, and with each segment for interconnection along the adjacent radial edges thereof forming a frusta-conical enclosure about 10 feet in diameter around the structure and the ladder for blocking unauthorized access to the ladder; and with at least one of said segments having an opening therein for providing clearance for the ladder and providing clearance for an authorized person to access the ladder; and
an access door for the enclosure, for covering the opening providing clearance for the authorized person, and having a lockable means thereon for securing said door to the frusta-conical enclosure, for blocking unauthorized access to the ladder, wherein said means for attaching said segments to said collar include said collar having a plurality of flanges extending radially and downwardly at an angle therefrom ranging from about 25 to about 45 degrees, and the upper portions of said segments having fasteners for engaging the respective flanges of said collar.
2. A security apparatus as defined in claim 1, wherein the structure has a generally cylindrical periphery and said collar is in the form of two corresponding semi-cylindrical bands.
3. A security apparatus as defined in claim 1, wherein the structure has a generally rectangular periphery and said collar is in the form of two corresponding semi-rectangular bands.
4. A security apparatus as defined in claim 1, wherein the structure is in the form of an \u201cI\u201d beam and said collar is in the form of two corresponding semi-rectangular bands.
5. A security apparatus as defined in claim 1, wherein said access door is hinged at one side thereof and includes a locking device on one of the other side thereof.
6. A security apparatus as defined in claim 1, wherein said access door is slidable along the enclosure to provide access to the ladder.
7. A security apparatus for blocking unauthorized access for a ladder that is supported on a generally vertical wall structure, the apparatus comprising
a retaining strip having a flange thereon for attaching the strip to the wall;
a plurality of frusta-conical segments each having an upper portion, a bottom portion and radial edges, with each upper portion having means for attaching to said strip, and with each bottom portion extending radially downwardly from said strip at an angle ranging from about 25 to 45 degrees, and with each segment for interconnection along the adjacent radial edges thereof forming a semi-frusta-conical enclosure about 5 feet in radius around the ladder and the wall for blocking unauthorized access to the ladder; and with at least one of said segments having an opening therein for providing clearance for the ladder and providing clearance for an authorized person to access the ladder; and
an access door covering the opening providing clearance for the authorized person, and having a lockable means thereon for securing said door to the frusta-conical enclosure, for blocking unauthorized access to the ladder, wherein said means for attaching said segments to said strip include said strip having a plurality of flanges extending radially and downwardly at an angle therefrom ranging from about 25 to about 45 degrees, and the upper portions of said segments having fasteners for engaging the respective flanges of said collar.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An active matrix type electroluminescence display device comprising:
a plurality of display pixels arranged in a matrix of rows and columns, each of said display pixels including an electroluminescence element to which one end of a capacitor for maintaining a voltage corresponding to a display signal is connected via a driver transistor; and
a plurality of capacitor lines extending in a row direction and connected to and shared by the other end of said capacitors of said display pixels; wherein
a constant voltage is supplied from both ends of said capacitor lines;
said capacitor is connected to a gate of the driver transistor, which drives the electroluminescence element.
2. An active matrix type electroluminescent display device comprising:
a plurality of display pixels, each including an electroluminescent element, arranged in a matrix of rows and columns, a first thin film transistor in which a display signal is applied to the drain and which is switched on and off in response to a select signal, a capacitor having one end connected to the source of the first thin film transistor and for maintaining a voltage corresponding to said display signal, and a second thin film transistor for driving said electroluminescence element based on said display signal;
a plurality of first capacitor lines, each extending in a row direction and connected to and shared by the other end of capacitors of said display pixels;
a second capacitor line connected to first ends of said plurality of first capacitor lines;
a third capacitor line connected to second ends of said plurality of first capacitor lines; wherein
said second and third capacitor lines are connected to a common constant voltage source, and said constant voltage is supplied to said first ends and said second ends of said plurality of first capacitor lines through said second and third capacitor lines.
3. The device of claim 2, wherein
said second capacitor line extends in a column direction on one side of an area in which said plurality of display pixels are arranged in a matrix, and
said third capacitor line extends in a column direction on the other side of the area in which said plurality of display pixels are arranged in a matrix.
4. An active matrix type electroluminescence display device comprising:
a plurality of display pixels, each including an electroluminescence element, arranged in a matrix of rows and columns, a first thin film transistor in which a display signal is applied to the drain and which is switched on and off in response to a select signal, a capacitor having one end connected to the source of the first thin film transistor and for maintaining a voltage corresponding to said display signal, and a second thin film transistor for driving said electroluminescence element based on said display signal;
a plurality of first capacitor lines, each extending in a row direction and connected to and shared by the other end of capacitors of said display pixels;
a second capacitor line connected to first ends of said plurality of first capacitor lines;
a third capacitor line connected to second ends of said plurality of first capacitor lines; and
wherein a constant voltage is supplied to said first ends and second ends or said plurality of first capacitor lines through said second and third capacitor lines.
5. The device of claim 4, wherein
said second capacitor line extends in a column direction on one side of an area in which said plurality of display pixels are arranged in matrix, and
said third capacitor line extends in a column direction on the other side of the area in which said plurality of display pixels are arranged in matrix.
6. The device of claim 1 comprising:
a second capacitor line connected to first ends of said plurality of capacitor lines;
a third capacitor line connected to second ends of said plurality of capacitor lines; and
wherein said constant voltage is supplied to said first ends and second ends or said plurality of capacitor lines through said second and third capacitor lines.