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A stress plate or seam plate for use in connection with securing membrane sheets to underlying roofing decking substructure comprises a circular disk having a central aperture for receiving a screw fastener. A plurality of concentric ribs are defined between the central aperture and the peripheral e

A stress plate or seam plate for use in connection with securing membrane sheets to underlying roofing decking substructure comprises a circular disk having a central aperture for receiving a screw fastener. A plurality of concentric ribs are defined between the central aperture and the peripheral edge of the plate for providing reinforcing and bending or flexibility characteristics to the stress plate or seam plate, and in accordance with the principles and teachings of the present invention, a plurality of circumferentially spaced, downwardly extending projections having substantially V-shaped cross-sectional configurations are provided upon the underside of the seam or stress plate so as to engage the membrane sheets and retain the same at their desired locations upon the underlying roofing deck substructural assembly. Contrary to conventional stress plates having sharp-pointed prongs or tangs, the projections of the present invention have substantially rounded or radiused apices so as not to puncture or rupture the membrane sheets.

대표청구항 ▼

A stress plate or seam plate for use in connection with securing membrane sheets to underlying roofing decking substructure comprises a circular disk having a central aperture for receiving a screw fastener. A plurality of concentric ribs are defined between the central aperture and the peripheral e

A stress plate or seam plate for use in connection with securing membrane sheets to underlying roofing decking substructure comprises a circular disk having a central aperture for receiving a screw fastener. A plurality of concentric ribs are defined between the central aperture and the peripheral edge of the plate for providing reinforcing and bending or flexibility characteristics to the stress plate or seam plate, and in accordance with the principles and teachings of the present invention, a plurality of circumferentially spaced, downwardly extending projections having substantially V-shaped cross-sectional configurations are provided upon the underside of the seam or stress plate so as to engage the membrane sheets and retain the same at their desired locations upon the underlying roofing deck substructural assembly. Contrary to conventional stress plates having sharp-pointed prongs or tangs, the projections of the present invention have substantially rounded or radiused apices so as not to puncture or rupture the membrane sheets. icia is marked on the front surface of the mounting plate on one of the sections of the mounting plate. 11. The device of claim 1 additionally comprising a pair of hinges, each of the hinges having a first end and a second end, each of the first and second ends of the hinges being coupled to the front surface of the mounting plate, each of the hinges comprising a half loop, the placards being pivotally mounted on the hinges. 12. The device of claim 11 wherein each of the placards has a peripheral edge, each of the placards having a pair of slots therein, each of the slots being located generally adjacent to the peripheral edge, each of the hinges extending through one of the slots of each of the placards. 13. The device of claim 1 additionally comprising a plurality of tabs each extending from one of the placards for facilitating turning of the placards. 14. The device of claim 13 wherein each of the tabs is integrally coupled to a top edge of one of the placards, the tabs being staggered in position along the top edges of the placards such that all of the tabs are visible when the placards are stacked on each other. 15. The device of claim 1 additionally comprising a pair of securing means for holding the placards in an abutted position against the mounting plate, a first of the securing means being generally adjacent to the first side edge of the mounting plate, a second of the securing means being generally adjacent to the second side edge of the mounting plate. 16. The device of claim 1 additionally comprising a plurality of fastening means for fastening the mounting plate to the vehicle, each of the fastening means extending through a bore in the mounting plate. 17. A convertible message sign device mountable to a vehicle for conveying a status of the vehicle to a person located at a remote distance from the vehicle, the device comprising: a mounting plate for mounting on the vehicle, the mounting plate having a front surface, a back surface, a top edge, a bottom edge, a first side edge and a second side edge, the front surface of the mounting plate having two sections; wherein the mounting plate has four corners, a plurality of mounting bores formed in the mounting plate for receiving fasteners to mount the mounting plate on the vehicle, each of the bores being generally adjacent to one of the corners, the mounting plate having a generally rectangular shape; a plurality of placards pivotally mounted on the mounting plate such that each of the placards pivots about a substantially common axis and is alternately positionable in front of one of the sections of the front surface of the mounting plate, each of the placards having a status indicia marked thereon, each of the placards having a front side and a back side, at least one of the front and back sides of each of the placards having one of the status indicia marked thereon, each of the status indicia comprising a single character; wherein the character of the status indicia comprises a letter of the alphabet; wherein each letter on the placards has a height that is greater than half a height of the placard on which the letter is marked and a width that is greater than half a width of the placard on which the letter is marked; wherein the height of each letter is between approximately one-half and three-quarters of the height of the placard on which the character is marked and the width of each letter is between approximately one-half and three-quarters of the width of the placard on which the character is marked; wherein both of the front and back sides of the placards on which the character is marked have one of the status indicia marked thereon, wherein each of the placards has a peripheral edge, each of the placards having a pair of slots therein, each of the slots being located generally adjacent to the peripheral edge, each of the slots being generally adjacent to a left edge of the front side of each of the placards; a pair of hinges, each of the h inges being generally hemi-cylindrical, each of the hinges having a first end and a second end, each of the first and second ends of the hinges being coupled to the front surface of the mounting plate, each of the hinges comprising a half loop, each of the hinges lying in substantially parallel planes with respect to each other, the hinges being spaced from each other, the placards being pivotally mounted on the hinges, wherein the placards are consecutively stacked such that the first placard is on top with the front side exposed; a first one of the placards having a letter B indicia marked on the front side and having a letter O indicia marked on the back side, a second one of the placards having a letter B indicia marked on the front side and a letter M indicia marked on the back side, a third one of the placards having a letter T indicia marked on the front side and letter R indicia marked on the back side, a fourth one of the placards having a letter T indicia marked on the front side, each of the placards being generally rectangular shaped, a letter I indicia being marked on the front surface of the mounting plate, the letter I indicia being between the first side edge of the mounting plate and the hinges; a plurality of tabs each extending from one of the placards for facilitating turning of the placards, each of the tabs being integrally coupled to a top edge of one of the placards, the tabs being staggered in position along the top edges of the placards such that all of the tabs are visible when the placards are stacked on each other; a pair of securing means for holding the placards in an abutted position against the mounting plate, a first of the securing means being generally adjacent to the first side edge of the mounting plate, a second of the securing means being generally adjacent to the second side edge of the mounting plate, each of the securing means being mounted to the front surface of the mounting plate, each of the securing means having a first end and a second end, each of the first ends being hingedly coupled to a base plate, each of the securing means having a spring therein adapted to urge the second end of the securing means toward the mounting plate, each of the securing means being a clasp; and a plurality of fastening means for fastening the mounting plate to the vehicle, each of the fastening means extending through one of the bores and into the vehicle, each of the fastening means being a bolt.