초록 ▼

The following specification describes a paint can mold in which a pair of concentric ring members and cores at diametrically opposed positions create concentric mold cavities for forming projecting bushings on the pail, each having a concentric handle bearing. The plastic for forming each bearing an

The following specification describes a paint can mold in which a pair of concentric ring members and cores at diametrically opposed positions create concentric mold cavities for forming projecting bushings on the pail, each having a concentric handle bearing. The plastic for forming each bearing and a handle interconnecting the bearings passes through a gate in each ring member. Withdrawal of the ring member severs the plastic in the gate from between the bushing and bearing so that the handle is free to rotate on the bushings. Means are provided to prevent disassembly of the handle from the can.

대표청구항 ▼

A method of forming a pivot assembly comprising the steps of: providing a first passage, moving a first ring in one direction within said passage to define a first bearing cavity having a first bearing surface formed by the outer surface of said ring and a second bearing cavity having a second beari

A method of forming a pivot assembly comprising the steps of: providing a first passage, moving a first ring in one direction within said passage to define a first bearing cavity having a first bearing surface formed by the outer surface of said ring and a second bearing cavity having a second bearing surface formed by the inner surface of said ring, forming a retaining cavity in communication with said second bearing cavity and spaced axially of said ring in the opposite direction, moving a first core member spaced radially inwardly of said ring in said one direction to form a wall of said retaining cavity spaced radially inwardly of said second bearing surface, introducing a plastic material into each of said cavities by first passing said material into one of said cavities and then passing plastic material from said one cavity through an aperture in said ring into the other of said cavities to form a first bearing in said first bearing cavity, a second bearing in said second bearing cavity, and a resilient member in said retaining cavity secured to said second bearing, moving said core member in said opposite direction to enable said resilient member to flex radially inwardly, moving said ring in said opposite direction, thus severing the plastic in said aperture from said first and second bearings, while first engaging said resilient member with said ring to flex said resilient member radially inwardly from said radial position intercepting said first bearing cavity and then disengaging said ring from said resilient member for enabling said resilient member to intercept axial movement of said first bearing in said opposite direction. The method of molding a pivot assembly which comprises: placing a ring member in a mold chamber to define a pair of spaced mold cavities inside and outside of said ring member; filling said mold cavities with material to be molded, and positioning said material in said mold cavities to form resilient, interlocking means whereby said molded, pivotable mebers are normally prevented from separating from each other, and removing said ring member from between said pair of spaced mold cavities and pivotable members by temporarily deforming said interlocking means to allow the ring member to pass from between said molded pivotable members and thereafter permitting said interlocking resilient means to spring back into their interlocking position.