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Tray construction for growing plants
| Details |
Inventors: Olsen, Robert C.;
Assignee: Illinois Tool Works Inc. (Chicago, IL)
Primary Examiner: Burr; Edgar S.
Assistant Examiner: Bratlie; Steven A.
Attorney, Agent or Firm: Buckman; Thomas W., Beart; Robert W., Benno; Edward L.
A tray construction for growing plants in which the construction comprises a one-piece substantially rigid tray frame with a plurality of plant frames mounted in the tray frame to define a plurality of plant growing containers interconnected in a unitary assembly. The tray frame may be conveniently molded from a foamed thermoplastic material and essentially comprises a plurality of substantially rigid tubular members vertically aligned and integrally interconnected in a rectangular array of a plurality of adjacent rows. The open spaces between diagonally opposed tubular members permit air to pass between the upper and lower sides of the tray frame. The plant frames are preferably frictionally held within the tubular members, and each plant frame essentially comprises a base section and a plurality of ribs secured to the base section to upstand therefrom. Each of the plant frames is telescopically mounted in one of the tubular members with the base section in a spaced relationship with the lower end of the tubular member to provide drainage openings therebetween. The ribs extend upwardly within and against the inner walls of the tubular members. |
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DETAILED DESCRIPTION The tray construction of the present invention utilizes a form of plant frame shown in the U.
S.
patent application of Byrant Edwards, Ser.
No.
670,918, filed Mar.
26, 1976 now U.
S.
Pat.
No.
4,031,832.
The plant frames of the Edwards' application utilize thin flexible sleeves mounted about the plant frames to form complete plant growing containers.
As opposed to the containers of the noted Edwards' application, the tray construction of the subject invention does not include individual sleeves and does not require additional trays for holding the containers in an upright growing position in a greenhouse.
In the subject invention the tray itself cooperates with the plant frames to define individual plant containers and the tray holds the defined containers in a group in upright growing position in a greenhouse.
Briefly, the tray construction of the present invention comprises a one-piece substantially rigid or self-supporting tray frame with a plurality of plant frames mounted in the tray frame to define a plurality of individual plant growing containers interconnected in a unitary assembly.
The tray frame is preferably molded from a foamed thermoplastic material in the general shape of a rectangular block.
A plurality of vertically aligned holes are formed in the tray frame and those holes extend from the upper surface to the lower surface of the tray frame.
The holes are arranged in a rectangular pattern of adjacent rows.
Preferably, somewhat diamond-shaped holes are formed in the tray frame between each group of four container holes so that the tray frame may be described as essentially comprising a plurality of substantially rigid tubular members vertically aligned and integrally interconnected in a rectangular array of a plurality of adjacent rows.
Dependent upon the manner in which the plant frames are mounted in the container holes, the tray frame may be supported on a table surface by the lower ends of the plant frames, or the underside of the tray frame may be provided with depending legs to support the tray frame on a table surface independently of the plant frames
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