Abstract: A trailer hitch assembly includes a receiver portion including a cylindrically-shaped cavity, a bushing member received within the cavity of the receiver portion, and a hitch member that includes a shaft pivotally received within the bushing member. At least a selected one of the bushing member and the shaft is constructed of a material that substantially eliminates the need for using a separately applied lubricant during use of the trailer hitch assembly.

Abstract: A hitch coupler (10) including an E-shaped frame (11), a pin (30) and a conical spring (36). The frame (11) includes a back plate (12), a top plate (14), a middle plate (16) and a bottom plate (18). The top (14), middle (16) and the bottom (18) plates include aligned openings. The pin (30) extends through the aligned holes (21, 23, 27) in the top (14), middle (16) and bottom (18) plates, with the pin (30) being configured to slide within the aligned openings (21, 23, 27). The conical spring (36) surrounds and engages the pin (30). The conical spring (36) biases a bottom of the pin (30) through the middle plate (16) and the bottom plate (18). The pin (30) includes a retainer (38) that extends through a slot (37) in the top plate (14) as the pin (30) is pulled against the bias of the spring (36). The retainer (38) abuts against a top of the top plate (14) when the retainer (38) is located above the top plate (14). The retainer (38) is located between the pin (30) and the spring (36).

Abstract: A hitch coupler (10) including an E-shaped frame (11), a pin (30) and a conical spring (36). The frame (11) includes a back plate (12), a top plate (14), a middle plate (16) and a bottom plate (18). The top (14), middle (16) and the bottom (18) plates include aligned openings. The pin (30) extends through the aligned holes (21, 23, 27) in the top (14), middle (16) and bottom (18) plates, with the pin (30) being configured to slide within the aligned openings (21, 23, 27). The conical spring (36) surrounds and engages the pin (30). The conical spring (36) biases a bottom of the pin (30) through the middle plate (16) and the bottom plate (18). The pin (30) includes a retainer (38) that extends through a slot (37) in the top plate (14) as the pin (30) is pulled against the bias of the spring (36). The retainer (38) abuts against a top of the top plate (14) when the retainer (38) is located above the top plate (14). The retainer (38) is located between the pin (30) and the spring (36).

Abstract: A trailer hitch assembly includes a receiver portion including a cylindrically-shaped cavity, a bushing member received within the cavity of the receiver portion, and a hitch member that includes a shaft pivotally received within the bushing member. At least a selected one of the bushing member and the shaft is constructed of a material that substantially eliminates the need for using a separately applied lubricant during use of the trailer hitch assembly.

Abstract: A motor/pump unit for pumping vapor in response to a flow of liquid, and particularly useful in systems for dispensing fuel to a vehicle wherein vapor given off by the fuel is to be returned from the filling port of the vehicle back to the fuel dispensing apparatus to avoid atmospheric contamination. One inventive embodiment, with available conventional fuel dispenser pressure and flow rate, allows abnormally small motor and pump chambers and motor/pump rotor assembly size and abnormally high rotor assembly rotation rate and abnormally quick rotor assembly acceleration to operating speed with sufficient vapor pumping capability. The resulting abnormally small motor/pump enables same to be easily adapted to a variety of existing dispensing pump and hose configurations. Under another embodiment, structure is provided for maximizing fuel flow rate and minimizing pressure drop across the motor/pump unit while providing adequate vapor pumping rate.