Door closure device

Claim 2

A door closer mechanism for automatically closing a door in response to a predetermined condition, the improvement comprising, in combination, a housing, a rotatable power shaft mounted in said housing and having a portion extending therefrom, force-producing means within said housing associated with said power shaft for rotatably biasing the latter in a door-closing direction, a door closure arm connected with a door to be controlled, said door closure arm being supported on said power shaft so as to be freely rotatable thereon, crank means fixedly mounted on said power shaft for conjoint rotation therewith, said crank means being engageable by said door closer arm when the latter is initially rotated in a door-opening direction thereby cocking said crank means and associated force-producing means while said door remains freely movable manually to any desired position between its fully open and fully closed positions, normally operable one-way brake means associated with said power shaft for preventing rotation of the latter in a door-closing direction, and means responsive to a predetermined condition for releasing said brake means enabling said force-producing means to rotate said power shaft and crank means in a door-closing direction whereby said crank means actuates said

Claim 3

A door closer mechanism as defined in claim 1 wherein said one-way brake means includes a brake drum fixedly mounted on said power shaft for

Claim 4

A door closer mechanism as defined in claim 2 including a flexible cable wrapped around said brake drum, said cable being fixed at one end, and normally operable pulling means connected to the other end of said cable for applying a pulling force thereto tending to tighten said cable around said drum, said pulling force causing said cable to brake said brake drum against rotation in the direction of said pulling force while permitting rotation of said brake drum in an opposite direction when said door closer

Claim 5

A door closer mechanism as defined in claim 3 where said cable is

Claim 6

A door closer mechanism for automatically closing a door in response to a predetermined condition, the improvement comprising, in combination, a housing, a rotatable power shaft mounted in said housing and having a portion extending therefrom, force-producing means within said housing associated with said power shaft for rotatably biasing the latter in a door-closing direction, a door closure arm connected with a door to be controlled, said door closure arm being supported on said power shaft so as to be freely rotatable thereon, crank means fixedly mounted on said power shaft for conjoint rotation therewith, said crank means being engageable by said door closer arm when the latter is initially rotated in a door-opening direction thereby cocking said crank means and associated force-producing means while said door remains freely movable manually to any desired position between its fully open and fully closed positions, normally operable one-way brake means associated with said power shaft for preventing rotation of the latter in a door-closing direction, said brake means including a brake drum fixedly mounted on said power shaft for conjoint rotation therewith, a flexible cable wrapped a plurality of times around the circumference of said brake drum, said cable being fixed at one end, normally operable pulling means connected to the other end of said cable for applying a pulling force thereto tending to tighten said cable around said drum, said pulling force causing said cable to brake said brake drum against rotation in the direction of said pulling force while permitting rotation of said brake drum in an opposite direction when said door closer arm is initially rotated in a door-opening direction, said pulling means comprising pneumatic means operable by a pre-determined air pressure, and means responsive to a pre-determined condition for releasing said air pressure and thereby releasing said brake means enabling said force-producing means to rotate said power shaft and crank means in a door-closing direction whereby said crank means actuates said door closure

Claim 7

A door closer mechanism for automatically closing a door in response to a predetermined condition, the improvement comprising, in combination, a housing, a rotatable power shaft mounted in said housing and having a portion extending therefrom, force-producing means within said housing associated with said power shaft for rotatably biasing the latter in a door-closing direction, a door closure arm connected with a door to be controlled, said door closure arm being supported on said power shaft so as to be freely rotatable thereon, crank means fixedly mounted on said power shaft for conjoint rotation therewith, said crank means being engageable by said door closer arm when the latter is initially rotated in a door-opening direction thereby cocking said crank means and associated force-producing means while said door remains freely movable manually to any desired position between its fully open and fully closed positions, normally operable one-way brake means associated with said power shaft for preventing rotation of the latter in a door-closing direction, said brake means including a brake drum fixedly mounted on said power shaft for conjoint rotation therewith, a flexible cable wrapped a plurality of times around the circumference of said brake drum, said cable being fixed at one end, normally operable pulling means connected to the other end of said cable for applying a pulling force thereto tending to tighten said cable around said drum, said pulling force causing said cable to brake said brake drum against rotation in the direction of said pulling force while permitting rotation of said brake drum in an opposite direction when said door closer arm is initially rotated in a door-opening direction, said pulling means comprising pneumatic means operable by a pre-determined air pressure, and means responsive to a pre-determined condition for releasing said air pressure and thereby releasing said brake means enabling said force-producing means to rotate said power shaft and crank means in a door-closing direction whereby said crank means actuates said door closure

Claim 8

A door closer mechanism as defined in claim 5 wherein said pulling means comprises a piston-cylinder assembly including a piston rod connected with

Claim 9

A door closer mechanism as defined in claim 5 wherein said power shaft extends transversely through said housing with the opposite ends of said power shaft projecting above and below said housing respectively, said brake drum being mounted on one end of said power shaft and said crank means being mounted on the other end of said power shaft, and said brake drum and crank means both being fixed to said power shaft for conjoint

Claim 10

A door closer mechanism as defined in claim 1 where said crank means includes a crank pin which is engageable by said door closure arm when the latter is initially rotated in a door-opening direction, and which actuates said door closure arm in response to said predetermined

Claim 11

A door closer mechanism for automatically closing a door in response to a predetermined condition, the improvement comprising, in combination, a housing, a rotatable power shaft mounted in said housing and having a portion extending therefrom, force-producing means within said housing associated with said power shaft for rotatably biasing the latter in a door-closing direction, a door closure arm connected with a door to be controlled, said door closure arm being actuated from said power shaft, normally operable one-way brake means associated with said power shaft for preventing rotation of the latter in a door-closing direction, said brake means including a brake drum fixedly mounted on said power shaft for conjoint rotation therewith, a flexible cable wrapped around said brake drum, said cable being fixed at one end, normally operable pulling means connected to the other end of said cable for applying a pulling force thereto tending to tighten said cable around said brake drum, said pulling force causing said cable to brake said brake drum against rotation in the direction of said pulling force while permitting rotation of said brake drum in the opposite direction, and means responsive to a predetermined condition for releasing said pulling force thereby releasing said brake means enabling said force-producing means to rotate said power shaft in a door-closing direction to actuate said door closure arm and effect closing

Claim 12

A door closer mechanism for automatically closing a door in response to a predetermined condition, the improvement comprising, in combination, a housing, a rotatable power shaft mounted in said housing and having a portion extending therefrom, force-producing means within said housing associated with said power shaft for rotatably biasing the latter in a door-closing direction, a door closure arm connected with a door to be controlled, said door closure arm being actuated from said power shaft, normally operable one-way brake means associated with said power shaft for preventing rotation of the latter in a door-closing direction, said brake means including a brake drum fixedly mounted on said power shaft for conjoint rotation therewith, a flexible cable wrapped around said brake drum, said cable being fixed at one end, normally operable pulling means connected to the other end of said cable for applying a pulling force thereto tending to tighten said cable around said brake drum, said pulling force causing said cable to brake said brake drum against rotation in the direction of said pulling force while permitting rotation of said brake drum in the opposite direction, and means responsive to a predetermined condition for releasing said pulling force thereby releasing said brake means enabling said force-producing means to rotate said power shaft in a door-closing direction to actuate said door closure arm and effect closing

Claim 13

A door closer mechanism as defined in claim 9 where said cable is

Claim 14

A door closer mechanism as defined in claim 9 where said pulling means comprises pneumatic means operable by a predetermined air pressure, and means responsive to said predetermined condition for releasing said air

Claim 15

For use with a door closer mechanism of the type having a housing, a rotatable power shaft mounted in said housing and having a portion extending therefrom, force-producing means within said housing associated with said power shaft for rotatably biasing the latter in a door-closing direction, and a door closure arm connected with a door to be controlled and actuated from the power shaft, the improvement comprising, in combination, a one-way brake including a brake drum fixedly mounted on said power shaft for conjoint rotation therewith, a flexible cable wrapped around said brake drum, said cable being fixed at one end, normally operable pulling means connected to the other end of said cable for applying a pulling force thereto tending to tighten said cable around said brake drum, said pulling force causing said cable to brake said brake drum against rotation in the direction of said pulling force while permitting rotation of said brake drum in the opposite direction, and means responsive to a predetermined condition for releasing said pulling force thereby releasing said one-way brake enabling said force-producing means to rotate said power shaft in a door-closing direction to actuate said

Claim 16

For use with a door closer mechanism of the type having a housing, a rotatable power shaft mounted in said housing and having a portion extending therefrom, force-producing means within said housing associated with said power shaft for rotatably biasing the latter in a door-closing direction, and a door closure arm connected with a door to be controlled and actuated from the power shaft, the improvement comprising, in combination, a one-way brake including a brake drum fixedly mounted on said power shaft for conjoint rotation therewith, a flexible cable wrapped around said brake drum, said cable being fixed at one end, normally operable pulling means connected to the other end of said cable for applying a pulling force thereto tending to tighten said cable around said brake drum, said pulling force causing said cable to brake said brake drum against rotation in the direction of said pulling force while permitting rotation of said brake drum in the opposite direction, and means responsive to a predetermined condition for releasing said pulling force thereby releasing said one-way brake enabling said force-producing means to rotate said power shaft in a door-closing direction to actuate said

Claim 17

The improvement as defined in claim 12 where said door closure arm is mounted so as to be freely rotatable relative to said power shaft, and crank means fixedly mounted on said power shaft for conjoint rotation therewith, said crank means being operable to actuate said door closure arm upon release of said one-way brake.