Abstract: A reservoir for grease is provided above the downwardly facing fifth wheel pin plate of a semi-trailer and opens downwardly through the plate at a point spaced forwardly of the associated depending fifth wheel pin. The reservoir may be filled with lubricating grease through a grease fitting associated therewith and sealed whereby the introduction of grease thereinto under pressure will cause the air pressure within the reservoir to be increased. The lower end of the reservoir opens downwardly through the fifth wheel plate and is equipped with a spring-biased ball valve projectable downwardly into sealed engagement with an appropriate seal provided therefor about the outlet of the reservoir and with the ball valve projecting below the fifth wheel pin plate.

Abstract: A single strip member is provided constructed of non-elastic rigid material having minimal flexive properties and the strip member is constructed in the form of an arcuate band of an angular extent greater than 360.degree. with at least slightly overlapped ends. Each of the ends is in the form of a circumferentially extending channel member with one of the channel members being more narrow than the other channel member and at least partially length wise telescoped therein. The side flanges of one of the channel members have an overcenter swingable actuating lever pivotally supported therefrom for swinging in the plane of the arcuate strip member and an overcenter positionable portion of the lever has one end of a stiff expansion spring anchored relative thereto while the other end of the expansion spring is anchored relative to the other channel member.