Handling: hand and hoist-line implements – Utilizing fluid pressure – Venturi effect
Patent
1996-02-16
1998-05-26
Denion, Thomas E.
Handling: hand and hoist-line implements
Utilizing fluid pressure
Venturi effect
29743, A47J 4500
Patent
active
057554714
ABSTRACT:
An improved actuator stem and actuator design are provided that greatly increase the accuracy of actuator type precision operations, such as surface mounted electrical component placement, die and attach tooling movements, and tape and reel part storage tooling. The actuator includes a housing having an inner surface and containing a first opening, a stem having a first end, an axis passing through said first end, and a cross section perpendicular to the axis having at least one edge. The stem is slidably disposed in the housing with the first end extending through the first opening substantially parallel to the axis. The stem is actuated along the axis by conventional methods, such as a spring. A portion of the inner surface conforms to a portion the cross section of the stem so as to prevent the stem from rotating about the axis. In a preferred embodiment, the stem has a D-shaped cross section perpendicular to the stem axis over the entire length of the stem in the direction of the axis. Alternatively, the cross section can be other shapes having an edge and need not have the same shape cross section of the entire length of the stem. In a preferred embodiment for a pick and place machine, the stem of the actuator is in the form of a D-shaped nozzle that is used in conjunction with a spring actuated stationary head to provide significantly increased performance levels.
REFERENCES:
patent: 4523515 (1985-06-01), Smith
patent: 4713976 (1987-12-01), Wilkes
patent: 4769904 (1988-09-01), Porterfield et al.
patent: 5073149 (1991-12-01), Maruyama et al.
patent: 5588203 (1996-12-01), Bidefeld
Banner Bryan K.
Bjorklund James M.
Denion Thomas E.
Micron Electronics Inc.
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