Plastic article or earthenware shaping or treating: apparatus – Means for molding powdered metal
Reexamination Certificate
2000-05-19
2001-07-10
Nguyen, Nam (Department: 1322)
Plastic article or earthenware shaping or treating: apparatus
Means for molding powdered metal
C425S458000
Reexamination Certificate
active
06257856
ABSTRACT:
FIELD OF THE INVENTION
The field of art to which the invention relates comprises method and apparatus for forming a surface hand grip on poured aggregate coping cantilevered about a swimming pool.
BACKGROUND OF THE INVENTION
A continuous nose or lip raised along the peripheral edge of coping cantilevered about a swimming pool is considered desirable as affording a reachable handgrip for swimmers particularly children. Such a configuration has long been available using precast coping.
For economic reasons, however, it has been preferred by many that pool decking including the coping be formed on site by the pouring of aggregate such as concrete. However, the use of poured aggregate heretofore has precluded the raised lip or projected nose being formed therewith along the peripheral edge of the coping. The inability to provide such a lip or nose has generally been attributed to the practice of the cement-placing crews rodding the top of the concrete form with their strike off rods when finishing concrete around the swimming pool. As a result, many states have forbidden poured cantilevered decking on public pools.
DESCRIPTION OF THE PRIOR ART
Cantilevered coping is commonly provided about the inside perimeter of a swimming pool and is typically constructed of either processed concrete slabs or of an aggregate poured on site. When poured, a form board is utilized to profile the coping as disclosed for example in U.S. Pat. No. 3,872,195. Unlike the precast coping slabs, forming the coping by pouring of aggregate has precluded forming an extension such as a raised horizontally placed lip or a vertically placed nose extending the entire peripheral edge of the coping that swimmers can grip or cling to from within the water. Such coping therefore is considered desirable as a safety feature and is frequently a code requirement for public pools frequented by children. On the other hand, the poured aggregate coping is considered more economical yet perfectly safe for many installations where use of a raised coping lip or nose is deemed unnecessary and/or not required by law.
Yet despite recognition of the foregoing, it has not been known heretofore how to form such a raised nose, lip or combination thereof along the coping edge where the coping is constructed of poured aggregate.
OBJECTS OF THE INVENTION
An object of the invention is to provide novel method and apparatus for effecting a raised lip, nose or combination thereof along the horizontal peripheral coping surface at the cantilevered edge of poured aggregate coping.
It is a further object of the invention to effect the previous object in a reliable and economical manner.
It is a still further object of the invention to construct a cantilevered coping of poured aggregate having a raised lip, nose or both along the peripheral edge that can conveniently be grasped by a swimmer in the water below.
SUMMARY OF THE INVENTION
This invention relates to forming the decking and coping for a swimming pool of poured aggregate. More specifically, the invention relates to a poured aggregate coping having a continuous gripping surface raised along the perimeter edge of the coping that can be readily grasped by a swimmer in the pool.
For achieving the foregoing, a configured form board is utilized to shape the face of the coping when poured and provides for forming a nose projection along the vertical edge facing of the coping. Operative in the alternative or in conjunction therewith is a hand displaceable hopper mule closely fitting over the form board and the already poured coping to provide a vertically raised lip along the horizontal surface end of the coping. The mule includes a vertical hopper into which poured aggregate is introduced and an underside longitudinally extending recess into which aggregate from the hopper is dispensed onto the horizontal coping underlying the mule. Longitudinally displacing the mule while continually maintaining an aggregate supply in the hopper causes the raised lip to be deposited continuously about the horizontal distal surface of the coping. Separate mules are then utilized for troweling while a finishing tool is used to eliminate any parting line and effect a seamless grasping surface of the lip and nose before the aggregate sets.
By means of the above, there is provided method and apparatus for overcoming a long standing limitation imposed on poured aggregate coping affording a safety feature previously unavailable with such copings.
The above noted features and advantages of the invention as well as other superior aspects thereof will be further appreciated by those skilled in the art upon reading the detailed description which follows in conjunction with the drawings.
REFERENCES:
patent: 3872195 (1975-03-01), Stegmeier
patent: 3968191 (1976-07-01), Stegmeier
patent: 4145155 (1979-03-01), Ogaki et al.
patent: 4574017 (1986-03-01), Stegmeier
patent: 5062737 (1991-11-01), Samuels
patent: 5330151 (1994-07-01), Boyack
patent: 5695586 (1997-12-01), Stegmeier
Stegmeier John M.
Stegmeier William J.
Nguyen Nam
Nguyen Thu Khanh
Rubin Daniel
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