Signals and indicators – Indicators – Page type
Patent
1997-08-25
1999-02-09
Chilcot, Richard
Signals and indicators
Indicators
Page type
116237, 281 42, 24332, 24338, 24495, 24509, 269152, 269238, 269254CS, B42D 900
Patent
active
058680993
ABSTRACT:
First and second pairs of arms are respectively disposed at opposite ends of a support structure. A constrainable member (e.g., a spring) is supported at its opposite ends by corresponding ones of the arms in the pairs. This is the only constrainable member in the page clamping device. When the spring is unconstrained, the arms in each pair are normally closed. The arms in each pair are pivotable independently of the arms in the other pair. The arms in each pair have at first positions camming peripheries which cause one of such arms to pivot when the other of such arms is pivoted. The arms in each pair have at second positions camming peripheries which provide a stable relationship between the arms when the arms are in an open position. The arms in each pair are disposed on the opposite sides of a book from the arms in the other pair. With the arms in the open relationship, the pages can be easily turned. When the arms in each pair are pivoted from the open relationship, the arms in such pair become pivoted toward the closed relationship as a result of the constraint on the spring. This causes the arms to clamp the pages on the same side of the book as such arms. Fingers made from a soft non-skid material (e.g., vinyl) may extend from the arms in a transverse direction for disposition on the pages to prevent damage to the pages when the pages are clamped.
REFERENCES:
patent: 369217 (1887-08-01), Thompson
patent: 527524 (1894-10-01), Elderkin
patent: 606924 (1898-07-01), Hale
patent: 1700846 (1929-02-01), Klein
patent: 3737178 (1973-06-01), Tjernlund et al.
patent: 5382055 (1995-01-01), Bettiol
patent: 5433415 (1995-07-01), Samson et al.
patent: 5722691 (1998-03-01), Patel
Begin Robert George
Chilcot Richard
Roston Ellsworth R.
Worth Willie Morris
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