Collapsible revolving door having pairs of pivot detents at the top and bottom of each leaf

Claim 1

In a collapsible revolving door having a central vertical axis and a plurality of door leaves, an improved mechanism for normally holding said leaves in radially extended positions for rotation in unison about said axis with the inner edges of said leaves facing said axis, and for allowing collapsing of said leaves, said mechanism comprising: a. upper and lower retaining plates concentric with said axis, b. means mounting said upper retaining plate at the top of said door and said lower retaining plate at the bottom of said door for rotation of saId upper and lower retaining plates about said axis, c. a plurality of bearing plates, one secured to the top and one to the bottom of each leaf adjacent the inner edges of said leaves, each bearing plate projecting laterally to each side of the plane of its associated leaf, said bearing plates at the tops of said leaves facing and being spaced just below said upper retaining plate and said bearing plates at the bottom of said leaves facing and being spaced just above said lower retaining plate, d. two detents coupled between each bearing plate, and the retaining plate associated with such bearing plate, said detents for each bearing plate being located substantially equidistant from the plane of the door leaf associated with such bearing plate and on a horizontal line substantially at right angles to such plane, e. said detents each including pivot means supporting their associated leaf in normally fixed relation to said retaining plates and being separable upon application of a predetermined force applied thereto in a first direction directed substantially radially away from said central axis through such pivot means and requiring a substantially higher force in any direction other than said first direction for separation, so that when a door leaf is pushed with a force sufficient to generate at the detents at one side of the leaf a force in said first direction which exceeds said predetermined force, said pivot means at the top and bottom of said one side of such leaf will separate allowing such leaf to pivot and fold about the pivot means at the top and bottom of the other side of such leaf.