Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Checks and closers – Pneumatic
Reexamination Certificate
1998-10-29
2001-03-20
Knight, Anthony (Department: 3626)
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Checks and closers
Pneumatic
C016S071000, C016S051000, C016S049000
Reexamination Certificate
active
06202253
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention generally relates to a cylinder lock door closer for storm doors, screen doors and the like. More particularly, the present invention relates to a cylinder lock door closer for storm doors, screen doors and the like which retains a door in its open position, while permitting the door to close under spring action, after a pulse of further opening pressure is applied to the door.
2. Discussion
In many buildings, storm doors or screen doors and the like are mounted outside the primary doors of the structure. Such doors almost always will not stay open unless held open by the user or a door closer device is manually positioned so as to hold the door in its open position. Usually, a compression spring is used to immediately return and close such secondary doors after they are released by the user.
In many cases, however, it is desirable that the secondary door be left open when the user is going back and forth through the door, has both arms occupied, is elderly, handicapped, or not ambulatory as in a wheelchair, or is simply attempting to open the primary door while still being able to immediately close the secondary door with relatively little effort.
In many door closers of the telescoping spring return type, a braking mechanism is mounted on a central telescoping piston rod to hold the door open. This type of design operates when the brake, usually a clip or washer located about the piston rod, is manually positioned to prevent the piston rod from retracting into a spring-containing housing. A difficulty with this type of closure is that it must be manually set and released, which is inconvenient if a person's hands and arms are occupied, such as when the person is carrying a large object or numerous objects through the doorway, or if the person is elderly, handicapped, or not ambulatory as in a wheelchair. Therefore, it is desirable to have a cylinder lock door closure device which allows a door to remain in its open position, and immediately return and close with relatively little effort from the user.
SUMMARY OF THE INVENTION
It is a general object of the present invention to provide a cylinder lock door closure device for storm doors which retains a door in its open position, while permitting the door to close under spring action, after a pulse of further opening pressure is applied to the door.
It is a more particular object of the present invention to provide a cylinder lock door closure device of simplified construction having a totally internal mechanism which will permit the user to open the door to a point where an internal mechanism will hold the door in an open position, and hold it there until the door is released by applying a small amount of opening pressure to the door.
It is another object of the present invention to provide a cylinder lock door closure device which allows a user to enter or exit a doorway when their hands and arms are occupied, such as when a large object is or numerous objects are being carried through the doorway, without having to put the item down to lock the door in its open position or release the door from its open position.
It is an object of the present invention to provide a cylinder lock door closure device which allows the user to immediately close the door after entering the building structure, which in turn saves on heating and cooling loss, and insect entry.
It is another object of the present invention to provide a cylinder lock door closure device which provides elderly users, handicapped users, and non-ambulatory users, as in a wheelchair, special assistance in entering and exiting a building structure.
It is an object of the present invention to provide a cylinder lock door closure device which relieves a user from resting the secondary door against their body while unlocking the primary door.
It is another object of the present invention to provide a cylinder lock door closure device wherein the holding mechanism is completely internal of the device so as not likely to be effected by the elements and is cosmetically identical to existing door closure devices.
It is an object of the present invention to provide a cylinder lock door closure device which replaces an existing door closure device, including a clip or washer located about the piston rod in order to prevent the piston rod from retracting into the cylinder.
In one form, the present invention provides a cylinder lock door closure device for retaining a door in its open position, while permitting the door to close under spring action, after a pulse of further opening pressure is applied to the door. The cylinder lock door closure device includes an arm assembly interacting with a catch piece.
Further areas of applicability, and additional benefits and advantages of the present invention will become apparent to those skilled in the art to which this invention relates from a reading of the subsequent description of the preferred embodiment and the appended claims, taken in conjunction with the accompanying drawings. It should be understood, however, that the detailed description and specific examples, while indicating preferred embodiments of the invention, are intended for purposes of illustration only, since various changes and modification s within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
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patent: 3538537 (1970-11-01), Strauss
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patent: 3630560 (1971-12-01), Atkins
patent: 3655228 (1972-04-01), Coopersmith et al.
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patent: 3785004 (1974-01-01), Stoffregen
patent: 4048695 (1977-09-01), Juilfs
patent: 4357731 (1982-11-01), Strauss
patent: 4894883 (1990-01-01), Fleischhauer
patent: 4932695 (1990-06-01), Pettit et al.
patent: 5529148 (1996-06-01), O'Leary
patent: 5832562 (1998-11-01), Luca
patent: 5842255 (1998-12-01), Luca
Harness Dickey & Pierce PLC
Knight Anthony
Universal Friendly Technologies LLC
Williams Mark
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