Drain cleaning tool

Claim 2

An hydraulic plunger for cleaning a clogged drain pipe comprising: a casing having an open end, an axially shiftable reciprocal piston retained therein, said piston having a boss on one side thereof with an axial opening therein; an electromagnetic unit in said casing on said one side of the piston and having an axially extending electromagnetically energized driven member with one end thereof seated in the opening of said boss and engageable with the piston, said end being axially offset from the piston to permit the member when energized to shift axially in the opening to thereby accelerate prior to engagement with and shifting of the piston toward the opposite end of said casing; a water inlet to the casing on the opposite side of the piston for passing water into said casing and through said open end; a check valve in the inlet for blocking water from flowing out of said casing via the inlet; a fitting on said casing at said open end and opening into said casing, said fitting being adapted to seat against a drain opening; a stop on the casing engageable with the piston for retaining the piston in axial offset relation with said end of said member; means for shifting the piston against the stop; and control means mounted on said casing for operating the electromagnetic unit in the casing to shift the driven member.

Claim 3

The invention defined in claim 1 further characterized by said control means being adjustable to cause said driven member to engage the piston at different but controlled intensities.

Claim 4

The invention defined in claim 1 further characterized by a bar being fixed to and extending radially outwardly from the casing to manual gripping means adjacent the bar ends.

Claim 5

The invention defined in claim 3 further characterized by an electric switch mounted on the bar adjacent the manual gripping means for operating the electromagnetic means.

Claim 6

A plunger for clearing a drain stoppage comprising: a casing having at one end a fitting adapted to seat and seal itself against a drain outlet, said fitting having a central bore extending through the fitting and opening internally to said casing, a piston within and shiftable lengthwise of said casing dividing said casing into a liquid side that is in communication with the bore and an opposite comparatively dry side, said piston having a boss on its dry side with an axial opening therein; an electromagnetic unit within said casing on said dry side and having a central electromagnetically energized and axially extending driving element extending toward the piston, said driving element having an end thereof seated in the opening; a stop in said casing engageable with the piston to limit movement thereof toward said driving element so that the latter is axially offset from the piston and so that a lost motion connection exists between the piston and driving element to thereby permit the element when energized to accelerate prior to said end of the driving element contacting and driving the piston; a switch for operating the electromagnetic unit; a fluid connection for filling the liquid side of said casing with fluid; means for returning the piston to engage the stop, and a check valve for the fluid connection for blocking flow of fluid through the connection.

Claim 7

A plunger for clearing a drain stoppage comprising: a casing having at one end a fitting adapted to seat and seal itself against a drain outlet, said fitting having a central bore extending through the fitting and opening internally to said casing, a piston within and shiftable lengthwise of said casing dividing said casing into a liquid side that is in communication with the bore and an opposite comparatively dry side, said piston having a boss on its dry side with an axial opening therein; an electromagnetic unit within said casing on said dry side and having a central electromagnetically energized and axially extending driving element extending toward the piston, said driving element having an end thereof seated in the opening; a stop in said casing engageable with the piston to limit movement thereof toward said driving element so that the latter is axially offset from the piston and so that a lost motion connection exists between the piston and driving element to thereby permit the element when energized to accelerate prior to said end of the driving element contacting and driving the piston; a switch for operating the electromagnetic unit; a fluid connection for filling the liquid side of said casing with fluid; means for returning the piston to engage the stop, and a check valve for the fluid connection for blocking flow of fluid through the connection.