Fences – Panels
Reexamination Certificate
2001-07-23
2003-05-20
Redman, Jerry (Department: 3634)
Fences
Panels
C049S049000, C256S065150, C403S102000
Reexamination Certificate
active
06565069
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to connections for tubular structures suitable for use as handrails, and more particularly to a hinge coupling and lock that can be attached to a standard handrail to form, together with an arm in the form of a short tubular rail component, a pivotally openable gate that opens and closes the handrail where it is necessary to have a closeable access through the handrail.
BACKGROUND OF THE INVENTION
Usually, handrails consist of horizontally and vertically arranged and connected metal hollow tubes of a selected cross-section, frequently circular. The handrails may be supported on a wall by horizontal mounting posts or may be supported from a floor by posts or stanchions, which are spaced from one another. The stanchions and wall mounting posts are interconnected by lengths of generally horizontal hollow tubing constituting the handrail, but the handrail may also be inclined or vertical along staircases or ladders. Handrails are installed to improve the safety of a specific site and to serve as a support in walking and climbing. In many industrial and civil buildings, handrails are an indispensable installation required by safety regulations.
In some places, it is necessary to make available an opening in the handrail to enable access to an area on the other side of the handrail. In many cases, those openings are simply left free as they do not need to be further secured (for example, when a handrail along a sidewalk is discontinued and restarted again to create an opening for accessing a crosswalk). In other sites, however, such openings reduce the safety of the installation, particularly where a handrail separates two areas situated at different levels. In those cases, it is desirable to secure the opening by creating some barrier or gate so the handrail constantly serves its safety purpose in its full length, but can be opened when needed.
Such gates within handrails can be commonly found in many manufacturing buildings, in the construction industry and in the marine industry, of which the field of recreational yachting is important. When an opening in the handrail is essential for a staircase, construction elevator, permanent ladder, or for boarding a vessel, some previous rather unsatisfactory designs for an openable section of the handrail that would maintain the structural integrity of the handrail have been proposed. It is desirable that any gate when closed, form an essentially uninterrupted continuum with the adjoining portions of the handrail, so that one's hand can pass along the gate and adjoining railing without impediment, and so that little or no risk of catching a glove or a sleeve occurs when gripping the railing in the gate portion or adjoining portions. It is further desirable that the gate be secure when closed. It is further desirable that all connecting parts, such as hinges, clasps and locks, be simple, reliable, easily manufactured, and strong enough for the purpose. Unfortunately, previously known gate arrangements have fallen short of one or more of these objectives.
In the industry, closing of a gate providing a temporarily open section of a handrail is typically achieved by mounting a simple hinge at one side of the gate bar or tube. The hinge connects one end of the stationary handrail with a sectional pivoting arm constituting the gate bar or tube, usually moving in a ninety degree angle. The arm is long enough to reach the other side of the temporary opening in the handrail, where it is usually received by a mating saddle-type receptacle attached to a horizontal part of the adjoining stationary handrail. Because the closed pivoting arm is not secured or locked by any means, but simply rests in the saddle and can be accidentally opened by bumping into it from the bottom, the gate constitutes a potentially hazardous section of the handrail. In addition, the hinge attachment, which represents the only means of permanent connection of the arm, can be easily damaged when a force is applied to the closed pivoting arm from its side.
To prevent accidental opening of such a conventional gate, holes are often drilled through the pivoting arm and through the handrail saddle, and removable bolts or pins are inserted into the holes to ensure that the closed arm does not open by accident nor move when a generally horizontal force is applied to it. However, obtrusive elements, such as exposed bolt heads and pins, reduce the overall safety of the handrail, as they can cause hand injuries when a person suddenly grips the handrail. Accordingly, although the conventional design of the mountable pivoting arm is advantageous to a limited extent, the methods of attachment and locking of the arm to the stationary handrail present potential opportunities for improvement.
For marine use, and typically in the construction of handrails for recreational yachts and the like, openings in the handrails, if secured at all, are commonly secured by mounting a stainless steel chain and hook, or a plastic coated stainless steel wire cable and hook, to stanchions or posts or terminating stationary rail elements at the ends of the opening. Alternatively, movable wooden handrail gates with protruding conventional hinges and expensive hardware may span the opening. Devices such as cables or chains do not retain the structural integrity of the boat handrail and are not safe in harsh weather conditions. Additionally, for yachting use, the overall aesthetic appearance of the handrail structure is an important issue, and current designs of hook and cable do not entirely satisfy the expected demands of boat owners for aesthetically pleasing designs.
Therefore, despite the obvious need for a safe and convenient handrail gate design, there has not heretofore been any completely satisfactory solution to the problem of providing a simple gate section in the handrail that would retain the structural integrity of the original handrail and at the same time be both aesthetically pleasing and safe.
It is apparent that the objectives of structural integrity and aesthetic appeal can be met by providing a handrail gate having the same cross-section as the stationary portion of the handrail. The problem is to provide a hinge on one end of the gate and a lock at the other end of the gate that maintain a uniform cross-section throughout the handrail when the gate is closed, even at points of connection. Such hinge and lock should be inexpensive, safe, easy to manufacture, install and use, aesthetically pleasing, durable and solid enough to resist occasional impacts accidentally caused by users without being displaced or sufficiently damaged to interfere with satisfactory operation.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a combination of a hinge coupling and lock for interconnecting a standard tubular handrail (typically but not necessarily of circular cylindrical shape) with a pivoting arm to form a gate within the handrail that retains the structural integrity of the original handrail, is safe and aesthetically pleasing.
Another object of the present invention is to provide a hinge and lock mountable on or connectable to a standard tubular handrail and on or to a mating pivotable gate arm, that are easy to manufacture, install and use, and that are at the same time durable and reliable.
Another object of the present invention is to provide a hinge coupling as aforesaid that enables pivoting of the gate arm through an angle up to about 180°.
Another object of the present invention is to provide a gate lock as aforesaid that locks automatically when the gate is closed.
Preferred Embodiment of the Gate
The gate according to the invention is particularly suitable for use with an elongate handrail or the like that has one or more open gateways that need to be locked (latched) closed from time to time. Each gateway exists between two spaced aligned terminals of the handrail, one terminal on either side of the gateway.
According to a preferred embodiment, the gate includes a pivotable gate arm, preferably having the same profil
Barrigar Robert H.
Redman Jerry
LandOfFree
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