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US 4,210,620 AGranted
Pivot assembly mold method
OwnerJohn W. von Holdtinventor
Life of this patent
Estimating the term…
Abstract
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.
Claims17
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.
4 more elements
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 at said mold cavities to form separate but interlocking relatively pivotable members, whereby said molded, pivotable members are normally prevented from separating from each other, in which one of said spaced mold cavities is filled by passing softened material to be molded into it through aperture means defined in said ring member communicating with the other of said mold cavities, and thereafter removing said ring member from said pair of spaced mold cavities and pivotable members by temporarily deforming said separate, interlocking, relatively pivotable members to allow said ring member to be withdrawn from between them, and thereafter permitting the separate, interlocking, relatively pivotable members to assume again their interlocked configuration.
A method of forming a pivot assembly comprising the steps of:
- placing a ring member in a mold chamber and forming a pair of spaced, molded members in said chamber separated by said ring member and respectively defining first and second bearing surfaces, said spaced molded members integrally connecting with each other through an aperture in said ring member;
- forming resilient means secured to one of said molded members and integral with one of said surfaces, said resilient means extending radially of said one surface to a position radially intercepting the plane of the other of said surfaces to restrict axial movement of said other surface, said resilient means being capable of retraction by deformation from said position intercepting the plane of said other surface, and moving said ring member axially in one direction to sever the integral connection of said molded members through said aperture and to force said resilient means to retract from said position intercepting the plane of said other surface, and continuing to move said ring in said one direction to disengage the ring from said resilient means, enabling said resilient means to again intercept the plane of said other surface.
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.
Dependencies are inferred from the claim text.