Horizontally supported planar surfaces – Tiltable surfaces – About plural axes
Patent
1978-09-28
1980-04-08
McCall, James T.
Horizontally supported planar surfaces
Tiltable surfaces
About plural axes
33446, 108 8, 108 9, 248456, A47F 512, A47B 2700, A47G 124
Patent
active
041966740
ABSTRACT:
A multi-level drafting table construction including a table base supporting a drafting board, and an arrangement of link members pivotally interconnecting the drafting board and table base. One of the link members, which is pivotally interconnected at one end to the drafting board, has its other end selectively receivable in ratchet teeth provided on the table base for adjusting inclination of the drafting board in multi-level positions of the board. A front link member is pivotally connected at one end to the table base at a first pivot axis which is a common axis for inclination of the drafting board about said axis for inclination of the board in a first range of inclined positions. The front link member is pivotally connected at its other end at a second pivot axis to the drafting board to provide pivotal movement of the drafting board about said pivot axis in a different range of inclined positions and at different levels. At the different levels of the drafting board the front link member is pivoted forwardly about the first pivot axis for cooperable engagement with a stop on the table base whereby the front edge of the drafting board is elevated to its different levels which include one or more levels.
REFERENCES:
patent: 180052 (1876-03-01), Northrop
patent: 836551 (1906-11-01), Werner
patent: 1443998 (1923-02-01), Meltzer
patent: 1829288 (1931-10-01), May
patent: 1985212 (1934-12-01), O'Farrell
patent: 2215462 (1940-09-01), Davidson, Jr. et al.
patent: 2795891 (1957-06-01), Bishop
patent: 3094948 (1963-06-01), Clow
patent: 3141260 (1964-07-01), Dompiri
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