Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
Patent
1980-05-06
1982-01-26
Phillips, Charles E.
Geometrical instruments
Straightedge type
Plural straightedges, relatively moveable
33492, 33493, B43L 706
Patent
active
043121330
ABSTRACT:
A T-square useful for drawing lines and cutting paper or plastic sheets comprises a ruler main body of a plastic material and an auxiliary ruler section detachably and turnably connected to an end of the main body by threaded fastening members, one of the opposed surfaces of the main body and the auxiliary ruler section adjacent to where they are connected being provided with a number of retaining bores arranged in a circular pattern about the threaded connection, the other opposed surface being provided with at least one retaining projection engageable in any one of the retaining bores, whereby the angle between the ruler main body and the auxiliary ruler is adjustingly variable. A metallic edge member covers a side edge of the main body to prevent a cutting knife from bitting into the plastic material of the ruler main body. The edge member is attached to the ruler main body at the longitudinal midportion thereof, the difference in the degree of thermal expansion or contraction between the ruler main body and the edge member thereby being accommodated.
REFERENCES:
patent: 757675 (1904-04-01), Peucker
patent: 794569 (1905-07-01), Thomas
patent: 798721 (1905-09-01), Wilson
patent: 1173341 (1916-02-01), Cotton
patent: 2127617 (1938-08-01), Petree
Miwa Gomu Kogyo Kabushikikaisha
Phillips Charles E.
LandOfFree
T-Square does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with T-Square, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and T-Square will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1661696