Geometrical instruments – Straightedge type – Wall guide and plumb
Patent
1985-05-10
1987-09-01
Martin, Jr., William D.
Geometrical instruments
Straightedge type
Wall guide and plumb
33 1LE, 248539, G01C 1510
Patent
active
046898891
ABSTRACT:
A device for supporting a building line reference consists of an elongate plate member for adjustable attachment to a wall face having upper and lower parallel channels, and a vertically oriented square section hollow member, in which said reference is received, secured to a plate slidably engaged in said channels having means for locking the plate against slidable movement. Said hollow member including two horizontal pivot bars located on the inside of two adjacent walls and threaded holes formed in said other two adjacent walls and positioned above and below said pivot bars whereby the reference member may be urged against said bars and brought into vertical orientation by the adjustment of threaded bolts received in said threaded holes.
REFERENCES:
patent: 1004194 (1911-09-01), Platt
patent: 1060284 (1913-04-01), Platt
patent: 2634740 (1953-04-01), Duke
patent: 2666260 (1954-01-01), Schneider et al.
patent: 3127684 (1964-04-01), Ernst
patent: 4057903 (1977-11-01), Cantera
European Patent Application, 0033992, 19/08/81, Voskanys.
European Patent Application 075,089, 29/06/83, Hummel.
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