Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Checks and closers – Pneumatic
Reexamination Certificate
2002-07-09
2003-10-21
Knight, Anthony (Department: 3676)
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Checks and closers
Pneumatic
C016S049000
Reexamination Certificate
active
06634058
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a door closer with a reliable arresting effect. In particular, the present invention relates to a door closer that may reliably arrest the door in a desired position and prevent injury to the user.
2. Description of the Related Art
FIGS. 1 and 2
of the drawings illustrate a conventional door closer comprising a cylinder
1
′ having holes
10
′ in an end thereof. Fasteners
101
′ extend through the holes
10
′ to fix the end of the cylinder
1
′ to a doorframe. A piston rod
2
′ is mounted in the cylinder
1
′ and includes an end extending beyond the other end of the cylinder
1
′. A retainer plate
3
′ is mounted around an exposed section
21
′ of the piston rod
2
′. A fastener
211
′ extends through a hole
210
′ in the piston rod
2
′ to fix the end of the piston rod
2
′ to a door. The length of the exposed section
21
′ in the open state of the door is longer than that in the closed state of the door. A compression spring
11
′ mounted in the cylinder
1
′ is compressed when the door is opened, and the spring force of the compression spring
11
′ automatically closes the door when the force for opening the door vanishes. In a case that the door is to be retained in a desired open position so that the door would not be closed automatically, the retainer plate
3
′ includes an arrestor
31
′ for selectively pressing against a peripheral edge
12
′ of the other end of the cylinder
1
′. Thus, movement of the piston rod
2
′ is stopped by an inner periphery
301
′ defining a central hole
30
′ of the retainer plate
31
′. When automatic closing of the door is required again, the retainer plate
3
′ is moved to disengage the arrestor
31
′ from the peripheral edge
12
′ of the cylinder
1
′. When the force for opening the door vanishes, the returning force provided by the compression spring
11
′ closes the door automatically. However, since the retainer plate
3
′ is slidably mounted around the exposed section
21
′ of the piston rod
2
′, the retainer plate
3
′ is apt to be shifted and thus fails to reliably arrest the door. In addition, the user could be injured by the unshielded retainer plate
3
′ exposed outside the cylinder
1
′.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a door closer with a reliable arresting effect to reliably, precisely arrest the door in a desired open position and prevent injury to the user.
A door closer in accordance with the present invention comprises a cylinder and a piston rod mounted in the cylinder and having an exposed section outside the cylinder. A retainer plate, an elastic element, and an end cap are mounted around the exposed section of the piston rod. The retainer plate has a hole through which the exposed section of the piston rod extends. The retainer plate further has a push member extending beyond the end cap through a slot in the end cap. The elastic element is attached between the sleeve and the retainer plate. The push member is pushable toward the sleeve to cause an inner periphery defining the hole of the retainer plate engage with the piston rod such that a side of the retainer plate presses against the pressing rod to stop movement of the piston rod during closing of a door to which the door closer is attached.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 836303 (1906-11-01), Christensen
patent: 3072954 (1963-01-01), Patriquin
patent: 3105264 (1963-10-01), Truhon
patent: 4194264 (1980-03-01), Stoffregen
patent: 4261601 (1981-04-01), Sloan
patent: 4646398 (1987-03-01), Myhrman
patent: 5108066 (1992-04-01), Lundstrom
patent: 5529148 (1996-06-01), O'Leary
patent: 5592780 (1997-01-01), Checkovich
patent: 5630248 (1997-05-01), Luca
patent: 5832562 (1998-11-01), Luca
patent: 6317922 (2001-11-01), Kondratuk
Bannapradist Lisa
Knight Anthony
Larson & Taylor PLC
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