This invention appertains to plumber's tools for unplugging stoppages in pipes or stacks and comprises a vacuum cup at one end of a handle and a reversible selectively operable pump which is mounted to operate through the cup. The parts of the mechanism are positionable so that the tool operates as a plunger with a vacuum cup or as a pump.

A multitubular once-through boiler which exhibits an excellent heat transfer efficiency and requires a relatively smaller installation area. The multitubular once-through boiler comprises a combustion device, a ring-shaped upper header which functions as a vapor chamber, a ring-shaped lower header which functions as a water chamber, a plurality of vertical water-tubes connecting the upper and lower headers to form a single-row ring-shaped water-tube wall, a combustion chamber which is a cylindri...

A double hand applicable to an industrial robot comprises two hand units (2, 3) comprising at least two pairs, one each, of fingers (2-1 and 2-2, 3-1 and 3-2) and plate members (2-3, 3-3) of a pressing unit (4) disposed in parallel along the center axis of the fingers. The hand units (2, 3) are connected through a pressing mechanism (4) to constitute a double hand in a manner that the respective gripping center axis of the two hand units are in alignment, the respective plate members (2-3, 3-3) ...

An improved sump pump apparatus of submersible nature of the type in which a pump impeller is located above an intake opening for drawing sump water through the intake opening and expelling the same through a pump discharge connection. The pump impeller is immediately adjacent the top of the intake opening, the top of the intake opening including a lubricating surface and the impeller being positioned as closely as possible to the top. A debris trap is situated within the pump beneath the intake...

A bridge plug for use in plugging a well at a subterranean location and adapted to be set in place by insertion through a tubing string. The bridge plug comprises an elongated vent tube supporting upper and lower petal basket structures, each of which comprises a plurality of petal leaves movable between a retracted position and an expanded position. In the expanded positions the petal leaves for the upper and lower baskets form conical configurations which face upwardly and downwardly respectiv...

A blind fastener of the pull through rivet type having a mandrel disposed in a hollow rivet having a flange end and a forming end, the mandrel has a head disposed adjacent the forming end and adapted to be pulled through the rivet body. The invention being in the mandrel head having a predetermined configuration acting on the forming end of the rivet while being pulled through the rivet body to upset the forming end of the rivet to provide inwardly disposed flanges. Additionally, the mandrel hea...

The diffuser is symmetrical about an axis AA' and has a flared outer wall (2,3) going from an axial inlet to an outlet. The outer wall is divided into an upstream portion (2) and a downstream portion (3) by a circular bleed slot (1) disposed symmetrically about the axis. The profile of the outer wall is such that, in operation, the direction of fluid flow along the outer wall is from the inlet towards the outlet, both over the upstream portion, and over the downstream portion. Further, it is so ...

A file folder comprises a rear panel of stiff paper-stock and a front panel of transparent plastic material connected to the rear panel along a hinge line. Preferably, the hinge line is provided by a soft crease in the front panel which defines an inturned margin adhesively secured to the rear panel. The file folder is durable, is relatively inexpensive to manufacture and decorate, and affords notations to be made thereon using a variety of writing implements. Several different embodiments of th...

A fuel supply system for an internal combustion engine including a combustion chamber and a rotatably mounted crankshaft, the fuel supply system comprising means for priming the internal combustion engine by supplying priming fuel from a fuel source to the combustion chamber, the priming means including a fuel line communicating with the fuel source and with the combustion chamber, and including selectively operable means for causing fuel flow in the fuel line. The fuel supply system also compri...

A flow through fluid analyzer and method of analysis which comprises providing a transparent analyzer tube having an open ended outer reservoir, a capillary tube connected at one end to the inner end of the outer reservoir and at its opposite end to the inner end of an inner reservoir provided with means for drawing fluid placed in the outer reservoir through the capillary tube into the inner reservoir and for returning the fluid to the outer reservoir, the analyzer being first filled with a car...