Abstract: A sight glass filter and check valve apparatus for use in a fluid line. The apparatus includes a housing, first and second couplers connected to the housing, a sight glass assembly, a filter assembly, and a check valve assembly. The housing includes a pair of coordinated apertures. Each of the couplers includes a first end and a second end with the first ends threadedly received by the housing and the second ends connected to the fluid line. The sight glass assembly is disposed within the housing in alignment with the apertures. The filter assembly is disposed between the housing and the first coupler. The check valve assembly is disposed between the housing and the second coupler.

Abstract: An EMI/RFI shielded housing for an electrical apparatus comprises a case member and a complementary cover member, each comprising an end wall portion and a side wall portion together defining substantially continuous and unbroken peripheral surfaces. The side wall portions of these members are respectively configured for an interference fit therebetween to define an assembled condition of the housing. This interference fit is defined by the side wall portion of the case member being received interiorally of the side wall portion of the cover member. Moreover, substantially the entire inner surfaces of the end wall portions of both case and cover member are electrically conductive, substantially the entire inner surface of the side wall portion of the case member is electrically conductive and major fractional portions of respective facing surfaces of the assembled and interference-fitted side wall portions are electrically conductive.

Abstract: A device is disclosed for receiving a disposable pipette tip, aspirating a supply of liquid into the pipette and dispensing the liquid in precise predetermined dosages. The device comprises a housing, a cylindrical passage within the housing, a piston extending into the passage from the rear end thereof and a plunger extending rearwardly from the piston. Actuating means are disposed within the housing for advancing the plunger forward in discrete amounts and a trigger extends from the housing operatively engaging the actuating means. The device further includes means for disengaging the actuating means whereby the plunger may freely be moved forward and back to permit a supply of liquid to be aspirated into the pipette. A detipping mechanism is also provided which permits a pipette tip to be removed without requiring any handling of it.

Abstract: A tool chuck for drills and the like including a body having gripping jaws slideably supported in tapered ways formed in the body. A split nut rotatably supported on the body threadedly engages the jaws and is operable to engage and release the jaws from a bit. The nut and body are interfitted to rotatably support and axially retain the nut on the body. A cup is fitted on the nut to hold it together and on the body and, together with the interfitted body and nut, protects the internal chuck parts from dirt and other foreign material.