Device for opening, closing and latching a vent closure member

Claim 2

In a means for opening, closing, and latching a closure member hinged at one side of an opening defined by a frame provided in a wall, the combination of: an upper latch member having one end provided with a pivotal connection to said closure member; a lower latch member having one end provided with a pivotal connection to said frame; the other ends of said latch members being pivotally interconnected together; the pivotal connection of the lower latch member to said frame having a pivotal axis adjacent the plane of the frame opening; and actuating means connected to said upper latch member the said pivotal connection of said latch members to said closure and to said frame being at the side of said opening opposite to said hinged connection of said closure member to said frame; the pivotal interconnections of the other ends of said latch members lying beneath the framed opening when the closure member is closed and the latch members are collapsed and in nested relation; said pivotal connections providing pivotal axes having a toggle relationship in closed position of said closure member; and means to adjust clearance of said nested latch members with respect to the interior surface of said wall, said adjustment means including a bolt carried by said closure members; and a connecting block threaded on said bolt and providing a pivotal connection for said upper latch member.

Claim 3

In a means as stated in claim 1 including a removable pin at said pivotal connection for said upper latch member.

Claim 4

In a means for opening, closing, and latching a closure member hinged at one side of an opening defined by a frame provided in a wall, the combination of: an upper latch member having one end provided with a pivotal connection to said closure member; a lower latch member having one end provided with a pivotal connection to said frame; the other ends of said latch members being pivotally interconnected together; the pivotal connection of the lower latch member to said frame having a pivotal axis adjacent the plane of the frame opening; and actuating means connected to said upper latch member the said pivotal connection of said latch members to said closure and to said frame being at the side of said opening opposite to said hinged connection of said closure member to said frame; the pivotal interconnections of the other ends of said latch members lying beneath the framed opening when the closure member is closed and the latch members are collapsed and in nested relation; said pivotal connections providing pivotal axes having a toggle relationship in closed position of said closure member; and means to adjust clearance of said nested latch members with respect to the interior surface of said wall, said adjustment means including means carried by said closure member for displacing and securing said pivotal connection of said upper latch member with said closure member; said displacing and securing means including an anchor element having a serrated inwardly and downwardly curved edge carried by said closure members; a mating connector element providing a pivot connection to said upper latch member and engageable with said serrated edge; and means for securing said anchor and mating elements in selected position of said upper latch member pivotal connection.

Claim 5

In a means for opening, closing, and latching a closure member hinged at one side of an opening defined by a frame provided in a wall, the combination of: an upper latch member having one end provided with a pivotal connection to said closure member; a lower latch member having one end provided with a pivotal connection to said frame; the other ends of said latch members being pivotally interconnected together; the pivotal connection of the lower latch member to said frame having a pivotal axis adjacent the plane of the frame opening; and actuating means connected to said upper latch member the said pivotal connection of said latch members to said closure and to said frame being at the side of said opening opposite to said hinged connection of said closure member to said frame; the pivotal interconnections of the other ends of said latch members lying beneath the framed opening when the closure member is closed and the latch members are collapsed and in nested relation; said pivotal connections providing pivotal axes having a toggle relationship in closed position of said closure member; and means to adjust clearance of said nested latch members with respect to the interior surface of said wall, said adjustment means including means carried by said closure member for displacing and securing said pivotal connection of said upper latch member with said closure member; said displacing and securing means including an anchor element having a serrated inwardly and downwardly curved edge carried by said closure members; a mating connector element providing a pivot connection to said upper latch member and engageable with said serrated edge; and means for securing said anchor and mating elements in selected position of said upper latch member pivotal connection.

Claim 6

In a means for opening, closing, and latching a closure member hinged at one side of an opening defined by a frame provided in a wall, the combination of: spaced sets of upper and lower latch members, each set of latch members including an upper latch member having one end provided with an adjustable pivotal connection to said closure member; a lower latch member having one end provided with a pivotal connection to said frame adjacent the plane of the frame opening; the other ends of said latch members being pivotally interconnected together; each of said upper latch members having a latch portion offset in a direction downwardly from the plane of said opening in latched closed position from the pivotal connection of said other ends of said latch members; the said pivotal connections of said latch members to said closure and to said frame being at the side of said opening to said hinged connection of said closure member to said frame; the pivotal connections of the other ends of said latch members lying beneath and outwardly of the edge of the framed opening when the closure member is closed and the latch members are collapsed and in nested relation; said actuating means including a crossbar extending between and connected to the offset portions of said upper latch members of said sets of latch members for simultaneous actuation of said latch members to raise said closure member to open position and to close said closure member to close position; said offset portions of said upper latch members of each set and said crossbar connected thereto being in spaced relation to said wall to facilitate grasping of said crossbar.

Claim 7

In a means for opening, closing, and latching a closure member hinged at one side of an opening defined by a frame provided in a wall, the combination of: spaced sets of upper and lower latch members, each set of latch members including an upper latch member having one end provided with an adjustable pivotal connection to said closure member; a lower latch member having one end provided with a pivotal connection to said frame adjacent the plane of the frame opening; the other ends of said latch members being pivotally interconnected together; each of said upper latch members having a latch portion offset in a direction downwardly from the plane of said opening in latched closed position from the pivotal connection of said other ends of said latch members; the said pivotal connections of said latch members to said closure and to said frame being at the side of said opening to said hinged connection of said closure member to said frame; the pivotal connections of the other ends of said latch members lying beneath and outwardly of the edge of the framed opening when the closure member is closed and the latch members are collapsed and in nested relation; said actuating means including a crossbar extending between and connected to the offset portions of said upper latch members of said sets of latch members for simultaneous actuation of said latch members to raise said closure member to open position and to close said closure member to close position; said offset portions of said upper latch members of each set and said crossbar connected thereto being in spaced relation to said wall to facilitate grasping of said crossbar.

Claim 8

In a means as claimed in claim 4 wherein said frame includes an inwardly extending flange disposed below edge margins of said closure member; and means positioned on said flange of said frame between said sets of latch members to maintain alignment of said frame as said closure member is drawn into closed position by said sets of latch members.

Claim 9

In a means as claimed in claim 5 wherein said alignment means includes a block of rigid material for restricting distortion of said frame as said sets of latch members are simultaneously moved into latch toggle locked position.

Claim 10

In a means as claimed in claim 4 wherein said adjustable pivotal connection of said upper latch member to said closure member includes a bolt carried by said closure member; and a connecting member threaded on said bolt and having a pivotal connection for the upper end of said upper latch member; and a removable pin at said pivotal connection for said upper end of said upper latch member to said connecting member; whereby each set of latch members are individually adjustable for providing uniform closure pressure of said closure member at the side of said opening opposite to said hinged connection of said closure member to said frame.