Fire escape – ladder – or scaffold – Pitched roof conforming scaffold
Utility Patent
1999-11-15
2001-01-02
Chin-Shue, Alvin (Department: 3634)
Fire escape, ladder, or scaffold
Pitched roof conforming scaffold
C248S237000
Utility Patent
active
06167987
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to roofing scaffolds generally and, more particularly, but not by way of limitation, to a novel adjustable roofing scaffold assembly and method of use that uses a minimum of nails inserted through shingles on the roof.
2. Background Art
Various types of roofing scaffolds are used by roofers and carpenters to support one or more workmen while working on a roof. Typically, a support consisting, usually, of a wooden plank placed horizontally between two or more supports, the supports being secured in position by means of nails inserted through previously laid shingles. When the workmen have finished working on the roof as far up as they can reach, additional supports are nailed through previously laid shingles and another horizontal wooden plank is placed between the supports. When a number of such repositionings are required, a fairly large number of nails must be inserted through the shingles. Such an arrangement is undesirable, however, since each nail hole, although sealed by roofing tar, for example, is a place for the future leakage of water into the roof structure.
Some devices for supporting workmen and items used by workmen are described in the following patents:
U.S. Pat. No. 3,292,734, issued Dec. 20, 1966, to Swanberg, and titled ROOF SCAFFOLD, describes an adjustable scaffold which includes two arms that extend over the peak of a roof. Each of the two arms has provision for two nails to be placed therethrough. Sideways movement of the scaffold requires that the nails be removed and the arms renailed in a new location.
U.S. Pat. No. 4,450,935, issued May 29, 1984, to Gustavus, and titled PORTABLE ADJUSTABLE ROOF PLATFORM, describes a roof platform that fits over rungs on a roof ladder. The platform is adjustable by means of a screw.
U.S. Pat. No. 4,695,023, issued Sep. 22, 1987, to McCafferty, and titled PLATFORM ASSEMBLY FOR SLANTED LADDER, describes another roof platform that fits over rungs on a roof ladder. This one is adjustable by means of pins engaging holes defined in side members of the platform.
U.S. Pat. No. 4,972,922, issued Nov. 27, 1990, to Levine, and titled ADJUSTABLE SCAFFOLDING ASSEMBLY, describes an adjustable scaffold support that is used with a conventional extension ladder. The top end of the extension ladder has attached thereto a structure which fits over the peak of a roof. The scaffold support is clamped to the sides of the ladder at any desired location and the slant of the support is adjusted by the top member of the platform engaging teeth formed on supports. A pin prevents the top member from accidentally disengaging from the supports.
U.S. Pat. No. 5,165,642, issued Nov. 24, 1992, to Rihaly, and titled SHINGLE HOLDER, describes a platform for holding shingles on a roof, the platform being frictionally held in place by means of a sandpaper-like material on the underside of the platform. The holder can also be nailed to the roof if necessary.
U.S. Pat. No. 5,320,194, issued Jun. 14, 1994, to Bredijk, and titled ADJUSTABLE ROOFING SCAFFOLD APPARATUS, describes a wheeled carriage for supporting a scaffold. A platform is attached to the carriage and the angle thereof is adjustable by means of its attachment to two arcuate members. A cable is attached to the carriage and to a fixture fitted over the peak of the roof. The carriage is raised up the roof surface by means of a “come-along”. In an alternative embodiment, a winch is provided at the roof peak for winching up the carriage.
U.S. Pat. No. 5,513,826, issued May 7, 1996, to Lebaron, and titled SUPPORT APPARATUS FOR STACKING AND CUTTING ROOF SHEATHING, describes a frame that includes hooks that may be placed over the peak of a roof.
U.S. Pat. No. 5,624,006, issued Apr. 29, 1997, to Richardson, Jr., and titled SUPPORT APPARATUS FOR USE ON AN INCLINED ROOF, describes a support that is attached to a ladder having ridge hooks, the support being attached to the ladder by means of rods passing through rungs of the ladder. The selection of the rungs and holes in vertical members is made such that the platform of the support is horizontal.
U.S. Pat. No. 5,887,406, issued Mar. 30, 1999, to Bond, and titled ARTICLE SUPPORT AND TRAY FOR A PITCHED ROOF, describes a support made of foam rubber or other such material to frictionally hold a tray or other articles.
U.S. Pat. No. 5,908,083, issued Jun. 1, 1999, to Hamilton, and titled ADJUSTABLE ROOFWORKER SUPPORT STRUCTURE, describes a scaffolding support having an overpeak member that is adjustable to match the angles of the roof surfaces. That is to which most of the patent is directed; however, FIG. 9 shows extension members that are attached to the basic member by means of pins.
Each of the foregoing devices is unsuitable for supporting scaffolding, requires horizontal relocation of the device when used for placing shingles on a roof, and/or uses a number of nails inserted through the shingles on the roof.
Accordingly, it is a principal object of the present invention to provide a roofing scaffold assembly and method suitable for placing shingles on a roof and that require only a minimum of nails to be inserted through shingles on the roof.
It is a further object of the invention to provide such a roofing scaffold assembly that is adjustable lengthwise.
It is an additional object of the invention to provide such a roofing scaffold assembly and method that are easy to employ.
It is another object of the invention to provide such a roofing scaffold assembly that is economically constructed.
Other objects of the present invention, as well as particular features, elements, and advantages thereof, will be elucidated in, or be apparent from, the following description and the accompanying drawing figures.
SUMMARY OF THE INVENTION
The present invention achieves the above objects, among others, by providing, in a preferred embodiment, a scaffold assembly for use on a roof, comprising: a base for placement on a first plank disposed on a scaffold bracket attached to said roof; an outer member having a lower end attached to said base; an inner member telescopingly received in said outer member and attachable to said outer member at at least one lengthwise location; and an upper plank support attached to an upper end of said inner member for placement thereon of a second plank.
REFERENCES:
patent: 1340492 (1920-05-01), McLanson
patent: 1592384 (1926-07-01), Peck
patent: 1730618 (1929-10-01), Mayo
patent: 3292734 (1966-12-01), Swanberg
patent: 4450935 (1984-05-01), Gustavus
patent: 4592446 (1986-06-01), White
patent: 4695023 (1987-09-01), McCafferty
patent: 4972922 (1990-11-01), Levine
patent: 5165642 (1992-11-01), Rihaly
patent: 5320194 (1994-06-01), Bredijk
patent: 5513826 (1996-05-01), Labaron
patent: 5590863 (1997-01-01), Sasaki
patent: 5624006 (1997-04-01), Richardson, Jr.
patent: 5887406 (1999-03-01), Bond
patent: 5908083 (1999-06-01), Hamilton
patent: 836640 (1920-01-01), None
Chin-Shue Alvin
Crozier John H.
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