Back to results
US 4,726,089 AGranted
Pipeline pig construction including threaded mandrel and nut for supporting resilient cups or discs
OwnerKenneth M. Knappinventor
Life of this patent
Estimating the term…
Abstract
A pipeline pig is disclosed, the preferred embodiment incorporating all plastic components including a central elongate mandrel being hollow along the middle to a forward transverse partition, a nut which threads to the forward end of said mandrel, said nut and mandrel locking together to secure components on said mandrel. The device further supports N cups, the cups preferably backed by adjacent discs for stiffening purposes and being spaced along the mandrel by spacer means. Scrapper discs can be used with the leading disc being harder & smaller while scrapping discs are softer and larger.
Claims19
A pipeline pig, comprising:
- (a) an elongate mandrel having a back end and front end, the back end including a first shoulder for registering components placed thereon and wherein front end is sized to permit components to slide thereover;
- (b) at least N pipe contacting cups having an outer peripheral lip thereon, each of said cups having a central opening therein sized to fit about said mandrel;
- (c) means fitting on the exterior of said mandrel for spacing said N cups along said mandrel;
- (d) fastener means releasably connected to said mandrel, said fastener means:
- (1) fastening to the front end of said mandrel;
- (2) selectively removable therefrom;
- (3) exteriorly located on said mandrel and bearing against the components placed on the exterior of said mandrel to apply a locking force there against;
- (4) sized to lock components after installation on said mandrel;
- and
- (e) wherein said mandrel and all components thereon are made of resilient material.
7 more elements
A pipeline pig, comprising:
- (a) an elongate mandrel having a back end and front end, the back end including a first shoulder for registering components placed thereon and wherein front end is sized to permit components to slide thereover;
- (b) at least N pipe contacting means having an outer peripheral lip thereon, each of said N means having a central opening therein sized to fit about said mandrel;
- (c) spacing means fitting on the exterior of said mandrel for spacing said N means along said mandrel;
- (d) fastener means releasably connected to said mandrel, said fastener means:
- (1) fastening to the front end of said mandrel;
- (2) selectively removable therefrom;
- (3) exteriorly located on said mandrel and bearing against the said spacing means and N means placed on the exterior of said mandrel to apply a locking force there against;
- (4) sized to lock said spacing means and N means after installation on said mandrel;
- and
- (e) wherein said mandrel, spacing means and N means thereon are made of resilient material.
7 more elements
Dependencies are inferred from the claim text.