Supports: cabinet structure – Disappearing-instrument type – With trackway
Patent
1977-06-17
1979-06-12
Sakran, Victor N.
Supports: cabinet structure
Disappearing-instrument type
With trackway
312 30, 312306, 312312, 108147, A47B 5100
Patent
active
041578511
ABSTRACT:
The present invention relates to a device for moving upwardly and downwardly a heavy device like a sewing machine body by make use of a constantly loading spring, more particularly, an ascent and descent means of a free-arm sewing machine, comprising an ascent and descent guide means like a guide rail in a cabinet of a free-arm sewing machine, a guide bar slidable inside the ascent and descent guide means, said guide bar being installed under a rectangular base plate for fixing the sewing machine body, a constantly loading spring of balanced or over-balanced load to be provided between the cabinet and the base plate, and a latch means which is provided at the ascent and descent guide means in order to fix the sewing machine body at a preferred position.
REFERENCES:
patent: RE28835 (1976-06-01), Roberts et al.
patent: 1778510 (1930-10-01), Richardson
patent: 2738248 (1956-03-01), Berker
patent: 2790689 (1957-04-01), Hubbell
patent: 2885253 (1959-05-01), Kesling
patent: 2931685 (1960-04-01), Butler
patent: 3438687 (1969-04-01), Wikey
patent: 3774872 (1973-11-01), Morelli
patent: 3941440 (1976-03-01), Menzin et al.
patent: 4005918 (1977-02-01), Smith et al.
Sakran Victor N.
Striker Michael J.
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