The present retainer holds the tooth in place regardless of the means of fabrication and despite some dimensional inaccuracies. Teeth of the general type heretofore described have been made by welding the pocket on the blade, by forging or even by casting, and the shank may be fabricated in various ways. Still another feature of the invention is the fact that the resilient insert accommodates slight inaccuracies in the dimensions to which the parts are manufactured and accordingly provides tolerance for such inaccuracies. Still a further feature of the invention is the fact that no special tools are required to install or remove the tooth. The resiliency of the insert insures a secure holding of the pin in place, preventing its dislodgement until the pin is deliberately driven out of position when it is necessary to change the tooth.Īnother feature of the invention is the facility with which the pin may be installed and removed and the tooth replaced when it is necessary to do so. Despite the vibration and jarring stresses which are imposed upon the tooth during excavation, the pin does not slip out of locking position. The present invention provides a retaining means which effectively holds a tooth in place on the tooth holder. The resilient means biases the tooth distally and the shank proximally, thus creating a shear on the retainer pin which prevents unintentional dislodgement of the pin during use. A resilient member is located in the bottom of the pocket and is deformed by the distal end of the shank when the tooth is forced into position. This invention relates to a new and improved locking retainer pin for earth excavating tooth of the cap type wherein a shank fits in a pocket in the tooth and is held in place primarily by means of a pin driven through holes in the sides of the pocket and in the shank. The combination of claim 1 in which said shank is transverse cross-section has more than four sides. The combination of claim 1 in which said shank is substantially rectangular in transverse cross-section.ġ1. The combination of claim 1 in which the ends of said pin are necked, said margins of said second and third holes engaging the necked ends of said pin, said pin being restrained against movement longitudinally of the axis of said pin by said margins bearing against said necked ends.ġ0. The combination of claim 7 in which said margins of said second and third holes engage the taper of said pin, said pin being restrained against movement longitudinally of the axis of said pin by said margins bearing against said taper.ĩ. The combination of claim 1 in which at least one end of said pin is formed with a taper.Ĩ. The combination of claim 1 in which said means forming said pocket is separate from said blade edges, said means forming said pocket being welded to said blade.ħ. The combination of claim 1 in which said tooth is unitary and said pocket is forged in said tooth.Ħ. The combination of claim 1 in which said distal edge is formed with a cavity and said insert is partially within said cavity.ĥ. The combination of claim 1 in which said insert is fused in the bottom of said pocket.Ĥ. The combination of claim 1 in which said insert prior to assembly of said tooth and holder is loose in the bottom of said pocket.ģ. In combination, a tooth holder having a shank having a transverse forward distal edge, the forward end of said shank being approximately triangular in longitudinal cross-section, a tooth having a blade and means forming a pocket in the rearward end of said tooth, said pocket formed substantially complementary to the forward end of said shank and having opposed walls and a forward end, a resilient insert in said pocket between said distal edge of said shank and the forward end of said pocket, said distal edge engaging said insert when said tooth is in place with said shank in said pocket, said shank formed with a round first hole extending transversely through said shank, said opposed walls formed with aligned round second and third holes, said second and third holes being offset forwardly of said first hole prior to deformation of said insert, and a hard pin extending through said first, second and third holes in the assembled position of said tooth and holder to retain the tooth on the holder, said insert being deformed by said shank in said assembled position and biasing said tooth and holder apart, the margins of said second and third holes engaging said pin under stress of said insert to restrain unintentional, longitudinal movement of said pin.Ģ.
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