Abstract: A removable end cap closure member or welsh plug for bearing units is disclosed including a frangible knockout plug adapted to be broken out of the closure member with an impact tool to provide an aperture allowing removal of the closure member with a tool. In the preferred embodiment, the plug remains attached to the closure member by a bendable connecting neck which prevents lodging of the plug in the bearing unit.Also disclosed is a bearing assembly including the removable end cap closure member as well as a method for removing the closure member including pressing the knockout plug with a tool to provide an aperture in the closure member and prying and bending the closure member away from the bearing unit with a tool inserted in the aperture. A fixture for supporting a trolley wheel and trolley bracket assembly during installation and removal of an end cap closure member to and from such an assembly is also disclosed.

Abstract: A cap and a base fit together to form the culture vessel. Adjacent the tops of the walls of the base is a rim which is "L" shaped in cross-section, consisting of a bottom leg joined to the base walls and an upright leg. Downwardly extending walls of the cap project into the space between this flange and the walls of the base. These cap walls have a plurality of spaced ribs which frictionally engage the walls of the base so that the cap will maintain a position in which it is slightly raised above the position wherein the cap is fully seated against the base. When in that raised position a length of cotton filtering material may be used between the bottoms of the cap walls and the bottom leg of the rim. The cap has an outside peripheral flange coplanar with the upright leg thereby permitting pressure sensitive tape to be applied to the two and bridging the space therebetween. Extending downwardly from the top, within the base walls and adjacent thereto, is a condensate drip flange.

Abstract: A unitary die-cast for housing electronic circuits includes one or more compartments or cavities adapted to receive a circuit boards therein. A compartment with a cavity includes a post centrally located in the bottom and extending upwardly in the middle of the cavity. A fastening device, such as a screw, is used to forcibly affix a rigid but flexible cover onto the housing at the center post. The cast and the cover are made of electrically conductive but acoustically dampening material. When the cover is forcibly affixed to cover the cavity, the cover and the chassis provide an acoustically and microphonically dampened housing for the circuit placed therein. The cast includes a wall separating the compartments, and the wall has a cavity along the length thereof and substantially co-extensive therewith for providing a thermal separation between the compartments whereby the wall acts as a thermal insulator.

Abstract: A method of sealing electrical components by positioning over the electrical component a heat recoverable sealing member. When a metal sealing member is utilized, the metal is in a deformed, unstable martensitic state, and thereafter is allowed to heat recover to a stable, austenitic state. When a plastic material is used, the polymer is heated, deformed and quenched in an unstable state, so upon heating it recovers via its elastic memory to a stable state.

Abstract: A device for plugging or sealing apertures comprising a heat recoverable dished disc which has the capability to increase its radial dimension upon being heated to a temperature above the transition temperature of the metal. Sealing is accomplished by selecting a heat recoverable dished disc having a radial dimension smaller than that of the aperture to be sealed, but which is capable of increasing its radial dimension to a magnitude greater than that of the aperture. The disc is inserted into the aperture and exposed to a temperature higher than its transition temperature whereupon the disc attempts to return to its original substantially planar configuration thereby increasing in radial dimension and sealing the aperture.