Spigot-forming tool

Claim 2

In a tool for tapering the outside surface of an open end of a tubular article, the tool having a reference part adapted to be longitudinally aligned with the article and to maintain the tool in operating relation with respect to the open end of the article; the assembly comprising: a head connected with the reference part and extending at a predetermined head angle with respect to the reference part, the head having a plurality of carriage-support surfaces corresponding to a variety of article sizes; a blade carriage having a cutting blade secured thereto, the carriage being removably attached at any one of the support surfaces to dispose the cutter blade in operative relation to the article; a plurality of rigid spacer members disposed between the carriage and a support surface in assembly, the spacers extending beyond the carriage a predetermined distance; and each carriage-support surface having a set of grooves recessed therein, the number in a set corresponding to the plurality of spacer members, the grooves being recessed to depths determined by a line having a predetermined mixture with respect to the head, and the spacer and each set of grooves cooperating to interlock and space the carriage at a predetermined carriage angle related to the head angle to dispose the cutter blade at a taper angle predesignated for each article size.

Claim 3

The structure defined by claim 1, wherein: the head is aligned perpendicularly to the reference part; the cutter blade has a straight cutting edge; the carriage has a base portion adapted to be attached at any of the support surfaces, the spacer members protrude from the base portion, said predetermined distance being to a line perpendicular to the cutting edge; and the grooves in each carriage-support surface are recessed to depths which are determined by a line which is at said predesignated taper angle with respect to the head alignment for each carriage setting.

Claim 4

In a spigot-forming tool for tapering the ends of a variety of plastic pipes having different diameters, the tool being adapted for use with a plurality of reference parts, each having a cylindrical surface adapted to be inserted in longitudinal axial alignment within a pipe end of a particular diameter; the improved combination comprising: A head bar selectively attachable to each of said reference parts, the head bar providing a plurality of carriage settings, and having a support surface spaced to correspond to a reference part, at each setting; a carriage removably attachable to each of the carriage-support surfaces, the carriage carrying a cutter blade spaced adjacent a cylindrical surface of a selected reference pArt at a corresponding carriage setting in assembly; and connecting means for removably attaching the carriage to any of said support surfaces as selected, the connecting means being constructed to incline the cutter blade at a predetermined taper angle with respect to the alignment of the cylindrical surface for each selected reference part and corresponding carriage setting, the angles being predetermined in accordance with the variety of pipe diameters.

Claim 5

In a spigot-forming tool for tapering the ends of a variety of plastic pipes having different diameters, the tool being adapted for use with a plurality of reference parts, each having a cylindrical surface adapted to be inserted in longitudinal axial alignment within a pipe end of a particular diameter; the improved combination comprising: A head bar selectively attachable to each of said reference parts, the head bar providing a plurality of carriage settings, and having a support surface spaced to correspond to a reference part, at each setting; a carriage removably attachable to each of the carriage-support surfaces, the carriage carrying a cutter blade spaced adjacent a cylindrical surface of a selected reference pArt at a corresponding carriage setting in assembly; and connecting means for removably attaching the carriage to any of said support surfaces as selected, the connecting means being constructed to incline the cutter blade at a predetermined taper angle with respect to the alignment of the cylindrical surface for each selected reference part and corresponding carriage setting, the angles being predetermined in accordance with the variety of pipe diameters.

Claim 6

The combination of claim 3, wherein: the connecting means includes rigid spacer bearings attached to the carriage and disposed to maintain a space between the carriage and head in assembly; and bearing grooves are recessed in each of the carriage support surfaces; the grooves being of depths to receive portions of the spacer bearings and incline the carriage and cutter blade.

Claim 7

The combination of claim 4, wherein: the cutter blade has a straight cutting edge; the carriage has a base surface facing the selected support surface when assembled for operation, the bearing spacers protrude from the base surface a distance to a line which is at a predetermined angle with respect to the cutting edge; and the grooves in each support surface are recessed to depths permitting varying portions of the bearing spacers to be received therein to determine said incline of the cutter blade.

Claim 8

The combination defined by claim 5, wherein: the bearing spacers protrude to a line which is perpendicular to the cutting edge; and the grooves in each support surface are recessed to depths determined by a line extending at a corresponding predetermined taper angle with respect to a perpendicular to the longitudinal axis of said cylindrical surface.

Claim 9

The combination of claim 3, wherein the blade is beveled and is attached in a complementary channel in the carriage, the channel has a beveled reference edge at the top, the edge complementing the bevel of the blade to permit the blade to be inserted in said channel in a predesignated position.

Claim 10

In a tool for reducing and tapering the wall a reference part adapted to be aligned with a longitudinal axis of the tubular article; the improved assembly comprising: a head connected with the reference part and having a portion extending laterally of the reference part at the open end of the article being operated on, the head having a plurality of carriage-support surfaces corresponding to a variety of article sizes, each said support surface including a orientation portion formed at a different predetermined angle of incline correlated to the corresponding article size; a blade carriage removably attached to said head at a selected one of said support surfaces, said carriage having a guide-surface portion engaging said orientation portion at said selected-support surface, and said carriage extending longitudinally over the reference part; and a cutter blade fixed to said blade carriage in operational relation to the article, said blade being disposed at a desired taper angle for each article size by said guide surface and orientation surface when said carriage is attached to the corresponding support surface.

Claim 11

In a tool for reducing and tapering the wall a reference part adapted to be aligned with a longitudinal axis of the tubular article; the improved assembly comprising: a head connected with the reference part and having a portion extending laterally of the reference part at the open end of the article being operated on, the head having a plurality of carriage-support surfaces corresponding to a variety of article sizes, each said support surface including a orientation portion formed at a different predetermined angle of incline correlated to the corresponding article size; a blade carriage removably attached to said head at a selected one of said support surfaces, said carriage having a guide-surface portion engaging said orientation portion at said selected-support surface, and said carriage extending longitudinally over the reference part; and a cutter blade fixed to said blade carriage in operational relation to the article, said blade being disposed at a desired taper angle for each article size by said guide surface and orientation surface when said carriage is attached to the corresponding support surface.

Claim 12

In a tool for reducing the wall thickness on an open end of a tubular article, the tool having a reference part adapted to be longitudinally aligned within the open end; the improved assembly comprising: a head connected with the reference part and extending laterally at a first predetermined angle to the reference part, and the head having a plurality of carriage-support surfaces corresponding to a variety of article sizes; a blade carriage having a cutting blade secured thereto; a base portion on said carriage and adapted to be removably attached to any one of said support surfaces of the head to dispose the cutting blade in operative relation to the article; at least two rigid spacers connected with said base portion, said spacers having bearing surfaces extending outwardly of said base portion; and Each said support surface having a number of bearing grooves corresponding to said spacers, said grooves being complementary in shape and position to the bearing surfaces for interlocking said spacers and grooves in assembly, and said grooves being machined to predetermined depths to receive only that portion of the corresponding bearing surfaces which serve to space said carriage from said head at a second predetermined angle to dispose the cutting blade at a desired taper angle with respect to the reference part in cooperation with said first predetermined angle, whereby a plurality of taper angles are provided in accordance with carriage settings for the variety of article sizes.

Claim 13

In a tool for reducing the wall thickness on an open end of a tubular article, the tool having a reference part adapted to be longitudinally aligned within the open end; the improved assembly comprising: a head connected with the reference part and extending laterally at a first predetermined angle to the reference part, and the head having a plurality of carriage-support surfaces corresponding to a variety of article sizes; a blade carriage having a cutting blade secured thereto; a base portion on said carriage and adapted to be removably attached to any one of said support surfaces of the head to dispose the cutting blade in operative relation to the article; at least two rigid spacers connected with said base portion, said spacers having bearing surfaces extending outwardly of said base portion; and Each said support surface having a number of bearing grooves corresponding to said spacers, said grooves being complementary in shape and position to the bearing surfaces for interlocking said spacers and grooves in assembly, and said grooves being machined to predetermined depths to receive only that portion of the corresponding bearing surfaces which serve to space said carriage from said head at a second predetermined angle to dispose the cutting blade at a desired taper angle with respect to the reference part in cooperation with said first predetermined angle, whereby a plurality of taper angles are provided in accordance with carriage settings for the variety of article sizes.