Indexing mechanism

• US 4,054,521 A
• Filed: 09/22/1975
• Issued: 10/18/1977
• Est. Priority Date: 05/10/1972
• Status: Expired due to Term

• Current Assignee: Brunswick Corporation
• Original Assignee: Brunswick Corporation
• Inventors: Winzen, John P.
• Primary Examiner(s): Adee, John
• Application Number:
  US05/615,517
• Time in Patent Office: 757 Days
• Field of Search: 210/97, 210/90, 210/387, 210/137, 210/103, 55/352, 55/354
• US Class Current: 210/137
• CPC Class Codes: B01D 29/114 arranged for inward flow filtration B01D29/15, B01D29/33 take precedence
• CPC Class Codes: B01D 29/72 involving vibrations
• CPC Class Codes: B01D 46/20 the belts combined with drums
• CPC Class Codes: B01D 46/46 automatic

Abstract

The invention relates to a continuous and controlled filter device that filters gases and liquids while maintaining a low differential pressure across the filter element. The device automatically advances clean filter medium into the filter seat or window when the differential pressure rises to a predetermined level replacing dirty filter medium with clean filter medium. The advance of the filter medium is effected by a fluid pressure operated expansible device cooperating with an indexing device for positioning the filter medium as a function of the pressure differential extending thereacross. The indexing device may include a ratchet structure for positively positioning preselected portions of the filter medium across the flow passage through which the fluid being filtered is passed.

Claims

1. In a filter device having a filter element, means defining a flow passage, and support means for supporting a portion of the filter element across the flow passage for filtering contaminants from fluid passed therethrough, improved positioning means for sequentially moving the filter element transversely to the flow passage for selectively disposing different portions of the filter element across the flow passage, said positioning means comprising:

a. an outer housing with said support means including a payoff spool and a take-up spool at opposite sides of the flow passage,

b. the fluid pressure operated expansible means comprises a bellows mounted in the housing,

c. indexing means operably associated with said support means for selectively positioning said different portions of the filter means across the flow passage means and including an escapement cam pivotally mounted on a rod slideably carried in the housing for movement by the bellows, means for biasing the cam, and a ratchet structure pivotally mounted within the housing and including a pawl coupled to the take-up spool, with the escapement cam operably associated therewith to cause indexed rotation of the take-up spool as a function of the pressure differential across said filter element portion, the ratchet includes a spring wound by the escapement as a function of the expansion of the bellows to rotate the ratchet a preselected maximum amount in tensioning the spring prior to disengagement of the escapement cam, the spring functioning to reverse the rotation of the pawl upon such disengagement, the bellows communicating with said flow passage at opposite sides of said filter element portion for operating said indexing means as a result of the pressure drop in said flow passage across said filter element portion reaching a preselected high value corresponding to a spent condition of the filter element portion to replace at least a preselected spent portion of the filter element with a fresh unspent portion for continued filtering of the fluid.