Tent – canopy – umbrella – or cane – Umbrella – Self-opening and closing
Patent
1979-02-05
1980-04-22
Bell, J. Karl
Tent, canopy, umbrella, or cane
Umbrella
Self-opening and closing
135 8, 135 14D, A45F 100, A45F 106, A45F 108
Patent
active
041989970
ABSTRACT:
A tent comprises a trapezoidal floor, two congruent trapezoidal side walls contiguous at the ridge line, a front wall in the shape of an equilateral triangle and including a door opening, and a rear wall in the shape of an obtuse isosceles triangle; wherein the triangular perimeter at every transverse cross-section is constant. The tent is supported principally by a tension line through the ridge line of the tent which is secured to a point outside the front of the tent and higher than the peak of the front, and is also secured to a second point outside the rear of the tent at the ground, with the floor and side walls of the tent being held in membrane tension by ground stakes at the lower apex points of the front and rear walls. The front door panel is held closed by an elastic member stretched in a straight line across the threshold and attached along its length to the shirred lower edge of the door panel.
REFERENCES:
patent: 872122 (1907-11-01), Guild
patent: 1057628 (1913-04-01), Eberhardt
patent: 1239550 (1917-09-01), Wykert
patent: 1658214 (1928-02-01), Thomas
patent: 2263867 (1941-11-01), Barnard
patent: 2442132 (1948-05-01), Laythe
patent: 2567697 (1951-09-01), Craighead et al.
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