Reduced friction coupling for shoring apparatus
View Patent ↗A reduced friction coupling which interconnects a lower, supporting member and an upper, supported member of a concrete forming apparatus to reduce the force required to lower the height of the forming apparatus under load on the members by a formed concrete structure. Two or more polymeric washers are received about the supporting member between a threaded nut which is used for adjusting the height of the forming apparatus and the supported member. The polymeric washers reduce by a surprising amount the force required to retract the nut under load. Washers of molybdenum disulphide filled nylon can support up to 10,000 pounds per square inch and reduce the force required to retract the nut by at least sixty percent under such a load compared to the force required if a single steel washer is used.
1. In a shoring apparatus including a shoring post for supporting a load and wherein the shoring post consists of a steel supporting member, an aluminum supported member received about an upper end portion of the supporting member, and a cast steel wing nut received about a threaded end potion of the supporting member below the supported member, a reduced friction coupling received about the supporting member between the nut and the supported member for reducing the force required to retract the nut under load, comprising two or more molybdenum disulphide filled nylon washers which reduce the force required to retract the nut under a load of up to about 10,000 pounds per square inch by between about sixty percent and about eighty percent from the force required if a single steel washer was used in place of the molybdenum disulphide filled nylon washers.