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US 4,070,727 AGranted
Device for automatic door closing
OwnerKazuyoshi Kanouinventor
Life of this patent
Estimating the term…
Abstract
A device for automatic closing of a door includes a plate spring of predetermined length, having an arcuate cross-section and a center section. The spring is bent about the center section at an angle deviating slightly from a straight line. The door may be opened and closed about a hinge, and the spring ends are attached to a wall and the door, respectively.
Claims4
A device for automatic closing of a door comprising:
- a plate spring of predetermined length, having an arcuate cross-section and a center section, said spring having first and second ends and being bent about said center section at an angle deviating slightly from a straight line;
- a stationary wall;
- a hinge attached to said wall;
- and
- a door openable and closeable about said hinge, the first spring end being attached to said wall and the second spring end being attached to said door.
2 more elements
Dependencies are inferred from the claim text.