Assembly of externally accessible brushes in an electric motor for power tools using an electric motor. The brushes are part of a brush holder assembly which also includes a holder having an internally threaded member portion of predetermined diameter, a tube carried in the holder, the brush radially slidable in the tube, and a coil spring carried on the brush. A retainer extends across the upper portion of the holder by a small predetermined dimension and is adapted to be radially depressed into the upper portion of the holder by means of a plunger or other suitable depresser such as a finger. The retainer acts to compress the spring and urge the brush downwardly, whereby the edges of the retainer are deflected into the threads of the holder. A cap is screw connected into the upper portion of the housing thereafter, with the retainer acting to isolate the spring from the turning motion of the cap, which might otherwise entangle the coils of the spring within the threads. Also, if a metal disc is attached to the brush by a wire to entrap the spring therebetween, the retainer permits the use of a simplified disc which is nonrotatable into assembled position by the retainer. The plunger acts to align and hold the spring out of contact with the holder during depression of the retainer within the holder.
A brush holder assembly has a body portion with a through opening and an externally accessible lateral opening communicating with the through opening and forming an internal shoulder within the body portion. A brush insert is slidably received within the through opening of the body portion and has an integral connection tab received within the lateral opening. The tab is bent over the shoulder to preclude axial withdrawal of the insert in one direction away from the body. A brush lead has a quick-connection terminal slidably received over the tab to make electrical connection to the insert within the lateral opening of the body. A brush is slidably received within the insert and extends beyond one end of the insert to engage a commutator. The other end of the insert is covered by a shunt cap, and a shunt is disposed between the shunt cap and the brush. A removable brush cap is secured to the outer end of the body, and a conical spring is disposed between the shunt cap and the brush cap. The enlarged end of the conical spring is seated within a blind axial bore in the brush cap, and the center of the spring bears against the shunt cap.
A brush holder 10 is provided for holding a hammer brush 12 of an electric motor. The brush holder includes a single piece of wire bent to define a brush-engaging portion 14 define an opening 15, and a torsion spring structure 16 connected to and spaced from the brush-engaging portion. The brush-engaging portion is constructed and arranged to prevent rotation of the hammer brush when coupled therewith.
An ignitor assembly for a fossil fuel-fired power generation system includes an elongate electrode, a tube sub assembly, and a coupling sub assembly, and an insulator sub assembly. The coupling sub assembly cooperates with other structural elements of the ignitor assembly and the respective windbox in which the ignitor assembly is installed to operably couple the elongate electrode to an external electrical power source. The ignitor assembly includes a contact socket secured by crimping to a lead of the external electrical power source which is biased into an electric current communicating disposition with the electrode rod of the ignitor assembly.
