Closure fasteners – Bolts – Swinging
Patent
1992-12-08
1994-02-15
Moore, Richard E.
Closure fasteners
Bolts
Swinging
292210, 292278, 49379, E05C 326
Patent
active
052860736
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device for fastening an ajar door, and more particularly, to a device for fastening an ajar door of an operator's cab.
BACKGROUND ART
Conventionally, an operator's cab having a device fastening the ajar door is constructed as in a perspective view shown in FIG. 6, and details of the device, indicated and are shown in the perspective view in FIG. 7, an elevational view in FIG. 8 and a top plan view in FIG. 9.
More specifically, a door 2 is swingably fixed to a side 3 of an operator's cab I by means of a hinge 4. A lock member 40 having a lock element 41 is fastened near the hinge 4 above the door 2 by means of a bolt 42. A bracket is attached to a position corresponding to the lock member 40 above the side 3, and a lock 50 is fastened by a bolt 55. The lock 50 includes a hook 51, a bracket 52, a pin 53 and a torsional spring 54 wherein the hook 51 is secured pivotally to the bracket 52 by means of the pin 53 and is urged in the direction of the arrow P (FIG. 8) by means of the torsional spring 54. The door is ajar and fastened by swinging the door 2 on the hinge 4 so as to allow the lock element 41 to push up the hook 51 against the urging force of the torsional spring 54 and to engage the hook 51 at the position indicated by chain double-dashed lines in FIGS. 8 and 9. The lock is unfastened by pushing up the hook 51 manually, thereby allowing the door 2 to close.
However, the foregoing construction has the following problems: the distance L.sub.2 (FIG. 9) between the center of the hinge and the center of the lock is small, and the lock is heavily burdened. Consequently, the fastening device has to be large and costly. operator's cab, it might be damaged by obstacles and does not present a good appearance. lock manually to unfasten the ajar door, and this is operationally inconvenient.
In view of the foregoing problems, an object of the present invention is to provide a device for fastening the ajar door which device is small in size, presents a good appearance, and is easy to unfasten.
SUMMARY OF THE INVENTION
To this end, a device for fastening an ajar door comprises a plate support element fixed adjacent to the center of the hinge side of the outer surface of a door of an operator's cab, a tubular support element connected at one end to the plate support element and at the other end to the outer surface of the door, a U-shaped striker fixed to the plate support element, a lock fixed to the side wall of the operator's cab for holding the striker which moves together with the door when the door is ajar, and an unfastening lever for releasing the lock from inside the operator's cab. The tubular support element is three-dimensionally formed so that it will not block an operator's line of vision; the lock comprises a hook having an engaging surface, a pin securing the hook pivotally, and a spring urging the hook counterclockwise; and the unfastening lever comprises a stopper having an engaging surface at one end and a lever at the other end, a pin securing the stopper pivotally, and a spring urging the stopper clockwise. According to this construction, when the door is ajar, the fastening device holds the striker and keeps the door ajar. The fastening device is easily unfastened by operating the unfastening lever in the operator's cab. The advantages obtained from this are as follows: center of the fastening device is greater, and thus the device is not so heavily burdened and accordingly the fastening device can be small. operator's cab, it will not be damaged by obstacles. The tubular support element also functions as a handle outside of the operator's cab, and presents a good appearance. the operator's cab.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a perspective view of an operator's cab provided with a fastening device of the invention;
FIG. 2 is an enlarged perspective view of the fastening device shown in FIG. 1;
FIG. 3 is a perspective view of a striker;
FIG. 4 is a sectional plan view of the fastening device when the door is closed;
FIG. 5 is
REFERENCES:
patent: 889365 (1908-06-01), Gray
patent: 1120095 (1914-12-01), Shook
patent: 1937520 (1933-12-01), Lightner
patent: 2693976 (1954-11-01), Bontempo
patent: 2863200 (1958-12-01), Miller et al.
patent: 3439948 (1969-04-01), Smith
patent: 3730575 (1973-05-01), Arlauskas et al.
Kabushiki Kaisha Komatsu Seisakusho
Moore Richard E.
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