Material or article handling – Elevator or hoist and loading or unloading means therefor – Grab
Patent
1989-12-08
1991-09-03
Spar, Robert J.
Material or article handling
Elevator or hoist and loading or unloading means therefor
Grab
901 40, 294 641, B66C 102, G25J 1100
Patent
active
050448684
ABSTRACT:
A system for controlling vacuum lifting apparatus 2 comprising a bellows like lift tube 3 having an interior 6 connectable to a vacuum pump, with a suction foot 10 associated with the lift tube 4. Valve 1, serving to connect the interior 6 at a controllable level to atmosphere to regulate the internal vacuum and hence the axial extension of the lift tube 3, comprises a housing 11 having a first connection 12 to the suction foot 10 in air-flow communication with a first chamber 13 of the housing 11, which chamber 13 has an outlet 14 to atmosphere controlled by a first valve member 15. A second connector 18 is in air flow communication to the vacuum pump via the lift tube 3, and air flow along the second connection 18 is controlled by a second valve member 20, whereby, in a load gripping and lifting mode, the first valve member 15 is partially open and the second valve member 20 is fully open; and in a load-releasing mode where the first valve member 15 is further or fully opened to admit air to the suction foot 10 and simultaneously, or shortly thereafter, the second valve member 20 is closed, or partialy closed, producing a higher vacuum in the interior 6.
REFERENCES:
patent: 3558171 (1971-01-01), Netsch et al.
patent: 3578372 (1971-05-01), Schuler
patent: 3743340 (1973-07-01), Williamann
patent: 3834558 (1974-09-01), Bru
patent: 4078671 (1978-03-01), Lundstom
patent: 4412775 (1983-11-01), Molitor et al.
patent: 4413853 (1983-11-01), Andersson
patent: 4557514 (1985-12-01), Cushman et al.
patent: 4651396 (1987-03-01), Kerlidou
patent: 4763941 (1988-08-01), Sniderman
patent: 4854627 (1989-08-01), Ericsson
patent: 4869489 (1989-09-01), Wirz et al.
Katz Robert S.
Palamatic Handling Systems Ltd
Spar Robert J.
LandOfFree
Valve system for controlling a vacuum lifting apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Valve system for controlling a vacuum lifting apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Valve system for controlling a vacuum lifting apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1004519