Static structures (e.g. – buildings) – Stepped; e.g. – stair
Patent
1995-06-07
1997-01-14
Bray, W. Donald
Static structures (e.g., buildings)
Stepped; e.g., stair
52188, 527412, 1441352, 1441366, 144356, 144382, E04F 1100, B27C 500, B27B 100
Patent
active
055927939
ABSTRACT:
A router machine for making repetitive router cuts at predetermined positions on one or two workpieces. The router machine has a free standing main frame with an open work horizontal platform for supporting said one or two workpieces. The platform has a longitudinal front edge with a fence therealong. Clamping mechanisms for clamping the one or two workpieces at the predetermined positions. A workpiece feed mechanism for advancing the one or two workpieces to each of the predetermine positions. A pair of routers are provided having vertically oriented, opposed, coaxial bits. A movable support assembly supports the routers. The routers are shiftable vertically on the support assembly toward each other to an extended cutting position and away from each other to a retracted non-cutting position. A pair of linear actuator assemblies are provided, each having a first end pivotally attached to the main frame and a second end pivotally engaged with an upstanding pivot pin affixed to said router support assembly to shift said routers through the repetitive router cuts. The pivot pin is coaxial with the router bits. The router machine is provided with a programmable electronic control system having output signals controlling the workpiece clamping mechanisms, the workpiece feed mechanism, the routers and their vertical positions between their extended cutting positions and said retracted non-cutting positions and the linear actuator assemblies.
REFERENCES:
patent: 1154752 (1915-09-01), Foster
patent: 4326572 (1982-04-01), Ingram et al.
patent: 4673011 (1987-06-01), Lapeyre et al.
patent: 4769920 (1988-09-01), O'Connor, Jr.
Automation in Housing & Manufactured Home Dealer, Feb. 1988, p. 58.
Ruvo Manufacturing, Model 2200 Series Automatic Double Stair Stringer Router, Apr./1989.
Damratowski Harold E.
Merrick Richard J.
Bray W. Donald
Merrick Machine Co.
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