US PATENT SUBCLASS 269 / 20
WITH FLUID MEANS

Current as of: June, 1999
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269 /   HD   WORK HOLDERS

20WITH FLUID MEANS {7}
21  DF  .~> Vacuum-type holding means
22  DF  .~> With movable diaphragm
23  DF  .~> With safety means
24  DF  .~> Plural positioning means sequentially operated
25  DF  .~> Cylinder-piston means directly moves jaw(s) {1}
27  DF  .~> Cylinder-piston means in series with additional positioning means {4}
35  DF  .~> With guide means

DEFINITION

Classification: 269/20

(under the class definition) Device including pneumatic or hydraulic means, or both, for holding, releasing, and/or force-applying purposes.

(1) Note. The fluid means may also be utilized to (a) "float" a portion of the work or work holder, (b) eject a workpiece, (c) remove unwanted particles falling on or adjacent the work holder during treatment, or, (d) any combination of (a), (b), and/or (c).

(2) Note. If a patent is silent as to how a cylinder or piston is returned to its normal or starting position, or if a patent discloses nonfluid means for returning a cylinder or piston, and there is no disclosure pertinent to any one of the indented subclasses, such patents will remain in this subclass.

(3) Note. If a patent discloses that a vacuum means is used only to remove a weighted element from the work (e.g., if suction is used to lift a cylinder above a workpiece, and allowing atmospheric air to re-enter the cylinder lets the cylinder descend onto the work by its own weight) such patent will remain in this subclass.

(4) Note. A fluid "cushion" chamber that is passive, rather than active, and is controlled only by (a) a valve means exhausting to atmosphere, or (b) a valve means exhausting into an unconfined liquid receptacle, or (c) a conduit which connects said chamber with a confined (second) chamber having a fixed pressure, or (d) any combination of (a), (b), and/or (c) is not deemed to be a device for moving a jaw or holder

for any one of the indented subclasses, and, if only such a means is claimed as part of a work holder, then the patent will remain in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS: 7, for patents including the use of a "freezing" means to hold work.

13+, for patents for a product discharge facilitator which may include fluid means to perform this function, and, see the notes thereunder.

55+, for patents including a similar means to a complete holder.

157+, for patents for a holder including means to bias a jaw(s) toward a nonholding position.

216+, for patents for a similar means to move a jaw(s).

SEE OR SEARCH CLASS

15, Brushing, Scrubbing, and General Cleaning,

3.12+, and 300+ for patents for a device in which a fluid contacts the work, and see the notes under subclasses 3.12, 300 and 301.

16, Miscellaneous Hardware,

49+, and 82+ for patents for a fluid check and closer.

60, Power Plants,

325+, for a force applying motor of general utility supplied with motive fluid from a pressure fluid source. 91, Motors: Expansible Chamber Type, for patents for structure of a fluid motor, per se, and see the notes under the class definition.

100, Presses,

269.01+, for patents for a press including fluid means to move one or more pressure surfaces, and see the notes thereunder.

137, Fluid Handling, for patents for a fluid handling means, and see the notes under the class definition.

188, Brakes,

266+, for a fluid-resistance brake or shock absorber.

192, Clutches and Power-Stop Control, for patents to a clutch, especially subclasses which include "fluid" in the

title.

279, Chucks or Sockets,

3, and 4.01+, for patents including a vacuum and a fluid operated chuck, respectively, and see the notes thereunder.

418, Rotary Expansible Chamber Devices, for rotary expansible chamber devices, per se.