| 摘要 |
A vacuum device for lifting an article such as a loaf of bread which is loosely wrapped in flexible film. A vacuum chamber in the device is provided with an anterior end wall that is ported for communication of the chamber with a vacuum source and with rigid diverging sidewalls that diverge from a protruding sidewall surface at the base of the chamber to the edge of the anterior end wall. When the article is lifted by the device, the diverging sidewalls are positioned in the path of the suspended film to cause the film to wrap around the sidewalls and the weight of the lifted article to forcibly urge the film into sealing contact with the protruding surface of the sidewalls as the film exits from the chamber. By urging the film into sealing contact with the sidewalls, the lifted article itself advantageously assists in maintaining the vacuum seal within the chamber. The vacuum chamber is sized and contoured for the film to be received within the chamber without being unduly stretched or permanently wrinkled.
|
