Apparatus and associated methods for forming curved wooden hand

Details Apparatus and associated methods for forming curved wooden hand Apparatus and associated methods for forming curved wooden hand

1989-12-08

1990-09-04

Bray, W. Donald

Woodworking

Process

Securing

144269, 144352, 156228, 269 43, 269270, B27D 100, B27H 100

Patent

active

049536028

ABSTRACT:
The construction and installation of a curved, laminated wooden bending rail used as a hand rail on a spiral staircase or the like is significantly facilitated utilizing a series of contoured clamp structures which circumscribe the rail and uniformly engage it, at each clamp location, around its entire periphery. Each clamp structure includes a pair of bolt-connected clamping blocks which may be drawn into circumbscribing abutment with and tightened around the rail. When the clamp structure is fully tightened, the surfaces of cutout portions in the two clamping blocks each closely conform to and uniformly engage a lateral half of the rail periphery and laterally clamp the rail laminae together with a clamping force which is very evenly distributed along the nonplanar opposite lateral side surfaces of the clamped rail section, thereby essentially eliminating marring and deformation of the rail caused by clamping force concentrations on circumferentially spaced portions thereof.

REFERENCES:
patent: 124108 (1872-02-01), Andereson

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