Closure fasteners – Extension link
Patent
1980-02-19
1982-06-22
Moore, Richard E.
Closure fasteners
Extension link
2922515, E05C 1756
Patent
active
043359116
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
TECHNICAL FIELD
This invention relates to door holders and in particular to door holders for use in vehicles and the like.
BACKGROUND ART
In a number of prior art applications, it has been found desirable to hold a door in an open position notwithstanding substantial forces acting on the door tending to swing it from the open position. One example of such an application is that of the door for a cab of a vehicle, such as an earthworking vehicle.
In the normal use of such earthworking vehicles, such as tractors, etc., the cab may be air conditioned. It has been found, however, that the operator may prefer to operate the vehicle with the air conditioning apparatus de-energized such as during temperate weather conditions. At such times, the operator may ventilate the cab by opening the cab door and various means have been provided for maintaining the door in the open position during such use.
One excellent example of a door holding means for such use is illustrated in U.S. Pat. No. 4,035,016 of John S. Ricca, which patent is owned by the assignee hereof. The apparatus for holding the door in the open position includes a crank having a handle and an eccentric arranged to hold the door against a stop. The structure includes a resilient linkage and means for limiting rotation of the crank to allow an over center action whereby the resilience of the linkage provides a firm holding of the door against the stop.
In another form of prior art structure for holding a door in an open position, catch mechanisms are provided at the top and bottom of the door. However, at times, relative motion occurs between the cab and the platform so as to cause twisting of the door held by the catches.
DISCLOSURE OF INVENTION
The present invention comprehends an improved means for holding a door in an apparatus, such as a vehicle, which is simple and economical of construction and which provides facilitated selective positioning thereof between retracted and door holding dispositions.
In one more specific aspect of the invention, the door holding means comprises a blocking element which is swingably mounted to the wall means defining the door opening so as to be selectively disposed across the opening to hold the door in the open position, or in a retracted position wherein the element hangs downwardly on the wall means.
In the illustrated embodiment, the elongated door blocking element comprises a rod which is pivotally mounted to the door frame by a pivot having a horizontal axis. The portion of the blocking element engaging the door defines a holding means at the opposite end of the blocking element.
The holding means may be pivotally connected to the blocking element so as to be pivotal about a vertical axis when the blocking element is disposed to hold the door open.
The invention further comprehends the provision of means spaced from the blocking element for releasing the holding means to permit the blocking element to return to the retracted position as by gravity.
The holding means may comprise magnetic means and in the illustrated embodiment, comprises electromagnetic means.
Energization of the electromagnetic means may be controlled by one or more switches. In the illustrated embodiment, one of the switches is arranged to be actuated as an incident of operation of the door handle.
A second of the illustrated door switches is arranged to be manually operated as desired.
In the specific illustrative embodiment, an electromagnet is mounted on the door and a magnetic plate is pivotally mounted to the distal end of the blocking element rod. The rod normally hangs downwardly with the magnetic plate lowermost. When the user wishes to hold the door in the open position, he need merely swing the rod to extend across the door opening so as to bring the plate into engagement with the electromagnet, whereupon energization of the electromagnet retains the blocking element suitably to maintain the door in the open position notwithstanding substantial forces being exerted thereon as in the operation of the vehicle in
REFERENCES:
patent: 875114 (1907-12-01), Scheld
patent: 1631980 (1927-06-01), Piccirilli
patent: 2472397 (1949-06-01), Bennett
patent: 3111340 (1963-11-01), Spencer
patent: 3533652 (1970-10-01), Crane et al.
patent: 4035016 (1977-07-01), Ricca
Caterpillar Tractor Co.
Moore Richard E.
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