Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Checks and closers – Spring and lever
Patent
1991-12-13
1994-01-04
Larson, Lowell A.
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Checks and closers
Spring and lever
16 52, 16 49, E05F 314, E05F 322
Patent
active
052748804
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a door closer in which a recovering force is accumulated in a door closing direction at the time of opening a door and a braking force of a damper is performed at the time of closing the door and, more particularly, to a device for automatically closing a door by mounting a closer body having a function of a damper at the door and an upper frame through arms.
2. Description of the Prior Art
A conventional door closer consists, as shown in FIGS. 9 and 10 showing the using state of a door closer, of a closer body a, an arm c fixed at one end thereof to a piston driving shaft b of the door closer body a, and an adjusting arm g pivotally secured at one end thereof to the end of the arm c via a screw d, etc., and pivotally secured at the other end thereof to a mounting plate e via a screw f, etc.,
The door closer body a has a hydraulic cylinder (not shown) in a body case a', and a piston (not shown) telescopically inserted into the hydraulic cylinder through a return spring.
In order to use the door closer of the arrangement described above, the closer body a is clamped at the upper portion of a door j openably pivotally secured via a hinge i at the hanging side to a vertical frame h through one or more clamping screws k, and the mounting plate e is clamped at an upper frame l via one or more clamping screws (not shown). In this manner, the piston is telescopically driven against the return spring by the piston driving shaft b rotated by both the arms by the door opening operation, the recovering force is accumulated at the return spring, and the door j is so mounted as to be automatically closed by the accumulated recovering force accumulated at the return spring.
In the door closer described above, the closer body a and the mounting plate e are respectively mounted at the door j and the upper frame l in a door closing state. In this case, the door closer is so mounted that a recovering force of certain degree is accumulated at the return spring even at the time of closing the door by considering a latching in the door closing state.
However, according to the conventional door closer, a considerably large closer body a must be mounted in the vicinity of the upper frame l of the door j. Therefore, in case of a narrow mounting space like a glass engaging door, the door closer might be sometimes impossible to be mounted at the door.
Further, in order to fully open the door in a direction of an arrow m from the door closing state in FIG. 9, the piston driving shaft b must be rotated at a considerably large rotating angle by the arm c. Accordingly, the internal structure of the door closer body a must be so composed as to be allowed to be rotatable at the large angle. This considerably restricts the degree of freedom of the door closer body a in design.
In contrast, in view of the arm crossing angle .alpha. formed between the arm c and the adjusting arm g in FIG. 9, as the door is opened, the crossing angle .alpha. is gradually increased. When the door is fully opened, the crossing angle .alpha. is arrived at the maximum value. As a result, when a hand is released from the door j in the door fully opening state, the door j is closed by the recovering force accumulated at the return spring. If the door is intended to be held in a door opening state, another suitable stopper mechanism must be arranged.
The conventional door closer further has the following disadvantage. A closer body a and a mounting plate e are fixed directly to a door j and an upper frame l in a state that all components are assembled completely. At this time, since arms c and g are rotatably energized in a direction of an arrow m in FIG. 9 by the recovering force accumulated at a return spring, the mounting positioning and the mounting works of the closer body a and the mounting plate e are not so easy, but long time and labor are wasted.
In case of a repair when the closer body a is defective, an inspection and a maintenance of the closer body a, not only the closer
REFERENCES:
patent: 2472508 (1949-06-01), Allen
patent: 3543327 (1970-12-01), Nilsson
patent: 3579709 (1971-05-01), Pierie
patent: 4491355 (1985-01-01), Marinoni
patent: 4564973 (1986-01-01), Kordes
patent: 4879785 (1989-11-01), Tolle et al.
patent: 5111548 (1992-05-01), Ohshima
Gurley Donald M.
Larson Lowell A.
Sugatsune Industrial Co. Ltd.
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