Fences – Rail
Reexamination Certificate
1999-12-06
2001-05-08
Browne, Lynne H. (Department: 3629)
Fences
Rail
C246S127000, C049S131000, C404S006000
Reexamination Certificate
active
06227523
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention concerns a barrier device, and more specifically, a gate for blocking and opening access to buildings or property.
2. Description of the Related Art
While the general utility of the barrier device of the present invention is not limited to conventional entryways, such as those for cages, in particular animal cages, or paths, the following description of the present invention and the problem addressed therewith will be oriented towards the above mentioned gates.
The securing of entryways of public or private property, such as the land of companies or industries, buildings, and the like against unauthorized access such as automobile access can occur in a conventional manner using this type of gate.
Swinging gates and sliding gates are known, which for opening and closing must be moved in their entirety. An example of this would be a sliding gate with vertical bars, which must be pushed sideways. These gates require much above-ground space for displacement.
Foldable scissors-gates overcome the problem of the high space requirement, but however exhibit other disadvantages, for example they are as a rule easy to climb over, are difficult to operate and are liable to wear.
As an alternative sunken gates have been developed, which can partially or completely disappear into the ground for opening access along the passageway. Such gates however require a deep trench into which to sink, which on the one hand is labor intensive to provide and on the other hand requires a perimeter for its positioning which may conflict with cables, pipes and the like buried in the ground.
From DE-PS-36 11 372 there is known a driveway blocking gate perpendicular to a street, with a trench and a gate which can be lowered into the trench via a hydraulic cylinder. The gate element is comprised of an upper horizontally running steel beam and multiple vertical steel beams connected thereto.
Also disclosed in this publication is a gate with gate slats, which at their upper end are connected via a head beam, which can be lowered in the barrier element. For this the gate slats extend through boreholes of the upper horizontally running steel beam of the barrier device. The head beam is likewise raised and lowered via hydraulic cylinders, which support themselves on the lower side of the vertical steel beam.
In this known barrier the trench depth corresponds to the height of the vertical steel beam plus the height of the hydraulic cylinder. The total height of the barrier is the sum of the stroke height of the horizontal steel beam and the stroke height of the gate. This design reduces a certain portion of the depth of the trench, is however complex and expensive.
SUMMARY OF THE INVENTION
The task of the present invention thus resides in the provision of an improved barrier device, in particular a gate for blocking and opening a through-fare for buildings or grounds, which can be lowered into a shallow trench depth and can be constructed in a simple manner.
A barrier device, in particular a gate for blocking and opening passage through a passageway for buildings or grounds, which includes a moveable framework for supporting a telescopic barrier arrangement; and a movement device for moving the framework between a blocking position and an open position of the telescopic barrier device; wherein the telescopic barrier device during movement from the blocking to the open position can be shortened with the aid of a counter-force which can be applied by a lowered base; and wherein the telescopic barrier device for movement from the open to the blocking position can be lengthened in the appropriate reverse manner by the action of the counter-force.
Of particular advantage in the inventive barrier device is the simplified design, which requires no complex mechanism that must act directly on the telescoping parts.
The present invention is predicated upon the idea of utilizing the gravitational force for pulling out the telescopic barrier device and the counter-force of a lowered base for contracting. For this the lowered base, for example the ground or a subterranean base plate, need not necessarily be provided in a through-going or continuous sunken trench, but rather the sunken trench can correspond to the geometric layout of the telescopic barrier device. As a result one can, by selecting a suitable design and position of the telescopic barrier device, take into consideration the lines buried in the ground and avoid interference.
In accordance with a preferred embodiment, the frame is comprised of two essentially vertical longitudinal supports and a first cross-beam guided essentially horizontally therein and moveable by the movement device. This is a particularly economical design.
In accordance with a further preferred embodiment, the telescopic barrier device is comprised of a plurality of telescopic rods, which on their one end are provided on the first cross-beam in a specified geometric arrangement.
According to a further preferred embodiment, the telescopic rods are provided on the first cross-beam in a linear arrangement.
According to a further preferred embodiment the framework includes an essentially horizontal second cross-beam, with the telescoping rods connected at one end to the second cross beam in an appropriate geometric arrangement. This design is characterized by being particularly stable.
According to a further preferred embodiment, the second crossbeam is guided in the two longitudinal supports.
According to a further preferred embodiment, the two longitudinal supports are provided in a sunken trench, of which the floor forms the base and which has such a depth that the first cross beam, when the barrier is in the open position, is flush with the ground and the telescopic barrier device is completely contracted.
According to a further preferred embodiment the second cross beam, when the barrier is in the raised or blocking position, closes the trench and is flush with the ground. This design prevents an undesired raising of the second cross-beam.
According to a further preferred embodiment, the telescopic rods are comprised of hollow tubes of varying diameters inserted into each other. This design provides for a problem-free contraction and extension of the telescopic rods.
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Bochna David
Browne Lynne H.
Pendorf & Cutliff
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