초록 ▼

In accordance with the present invention, there is provided a filter assembly having an improved system for selectively jacking a filter canister into and out of engagement with a filter head. A threaded jackscrew is mated to a threaded portion of the filter head and rotatably mounted to the filter

In accordance with the present invention, there is provided a filter assembly having an improved system for selectively jacking a filter canister into and out of engagement with a filter head. A threaded jackscrew is mated to a threaded portion of the filter head and rotatably mounted to the filter canister, but longitudinally confined near the canister top. The assembly accommodates a second class lever whose fulcrum end is received in a recess in the filter head. The jackscrew includes a plurality of circumferentially spaced lugs around the jackscrew perimeter against which the central portion of the lever can successively act. The manual application of force to the free end of the lever creates a mechanical advantage at the jackscrew lugs such that a torque sufficient to free and turn the jackscrew can be generated. Repeated pivoting of the lever against the lugs of the jackscrew in a ratchet-like manner unscrews the jackscrew, and the captive canister, from the filter head.

대표청구항 ▼

An apparatus for selectively jacking a filter canister into and out of engagement with a filter head, said apparatus comprising: a jackscrew rotatably mounted on said canister and threaded for mating with a threaded portion of said filter head; means on said filter canister to substantially prevent

An apparatus for selectively jacking a filter canister into and out of engagement with a filter head, said apparatus comprising: a jackscrew rotatably mounted on said canister and threaded for mating with a threaded portion of said filter head; means on said filter canister to substantially prevent longitudinal movement of said rotatable jackscrew relative to said canister; a notch in said filter head for receiving the first end of a lever and providing a fulcrum therefore; and a plurality of lugs fixed to and circumferentially spaced about the perimeter of said jackscrew such that at least one of said lugs is positioned to provide a point of lever resistance for the central portion of said lever whereby at least one of said plurality of lugs responds to the application of force to the second end of said lever by creating a mechanical advantage at said at least one of said plurality of lugs which, in turn, creates a torque on said jackscrew to selectively screw or unscrew said jackscrew relative to said filter head causing said filter canister to longitudinally move, without rotation, toward or away from respectively, said filter head.