Holddown system for horticultural plastic sheet

Details Holddown system for horticultural plastic sheet Holddown system for horticultural plastic sheet

1981-10-26

1983-03-29

Feyrer, James R.

Plant husbandry

Algae culture

47 9, 111 4, A01C 100

Patent

active

043779190

ABSTRACT:
A system for holding down horticultural plastic sheet provides a fastener and tool for driving and removing the fastener; the fastener may be an inverted "L" shape or in "T" shape or in inverted "W" shape according to embodiment with the lower portion wedge shaped and the upper portion held in a form-fitting socket in the head from which it can be removed by sliding in either of two directions or by springing apart of jaws of the tool to release the fastener; special cleat structure helps secure plastic sheet to the earth; in the "T" shaped embodiment and the "W" shaped embodiment, the fastener can hold two or more plastic sheets adjacently laid.

REFERENCES:
patent: 202909 (1878-04-01), Wilson
patent: 323419 (1885-08-01), Hiller
patent: 887134 (1908-05-01), Smith
patent: 1276887 (1918-08-01), Eckart
patent: 2539271 (1951-01-01), Rianda
patent: 2722062 (1955-11-01), Phillips
patent: 2877200 (1979-03-01), Slate
patent: 3290821 (1966-12-01), Parry
patent: 3315752 (1967-04-01), Pasquini
patent: 3362106 (1968-01-01), Goldring
patent: 3517629 (1970-06-01), Bridges et al.
patent: 3890910 (1975-06-01), Angruner
patent: 4083101 (1978-04-01), Coller

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