Woodworking – Process – Securing
Patent
1989-08-28
1990-10-02
Bray, W. Donald
Woodworking
Process
Securing
144269, 144344, 144352, 156222, 156228, 269 43, 269249, B27D 100
Patent
active
049601377
ABSTRACT:
An on-site fabrication method has been devised for compound bending of laminated wooden beam members into a handrail for curved or spiral stairways in which upstanding supports are positioned at intervals along the path of intended curvature on the stairway, the strips are assembled together in juxtaposed relation to one another and retained by leveling brackets on the support members whereby to prevent twisting of the beam members when a lateral force is applied, clamping the beam members together against each support member and permitting the beam members to be cured into a unitary rail section. In the preferred apparatus, right angle brackets are anchored to the tread portions with upstanding support members or legs disposed along the path of intended curvature, channel-shaped brackets are associated with the right angle brackets to apply pressure to the top and bottom surfaces of the beam members, and C-clamps apply a laterally directed pressure to clamp the beam members firmly against a closed end of each channel-shaped bracket and vertical leg of each right angle bracket.
REFERENCES:
patent: 3107708 (1963-10-01), Savage
patent: 3733055 (1973-05-01), Hughes
patent: 3835904 (1974-09-01), Sumner
patent: 3879026 (1975-04-01), Lappin
patent: 3902948 (1975-09-01), Morros
patent: 3922453 (1975-11-01), Seery
patent: 4132391 (1979-01-01), Takenaga
patent: 4256287 (1981-03-01), Birmingham
patent: 4602766 (1986-07-01), Naka
patent: 4646490 (1987-03-01), Naka
Grimm William G.
Pott Ronald W.
Bray W. Donald
R.W. Investment Co.
Reilly John E.
LandOfFree
Method and apparatus for forming curved handrails does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for forming curved handrails, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for forming curved handrails will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-288033