Positive retracting honing mandrel

A honing mandrel comprising an elongated body member having a central longitudinal axis extending between opposite ends thereof, one opposite end of said elongated body member being a mounting end including means for mounting for rotation on a honing machine and the other opposite end being a work engaging end, a passageway extending along the length of the elongated body member and a radially facing opening to the passageway extending along at least a portion of one side of said elongated body member adjacent to the work engaging end thereof,

• a stone assembly located in said radially facing opening, said stone assembly having a radially outwardly facing work engaging abrasive portion and a backing portion that extends radially inwardly into the opening, said backing portion having opposite longitudinally extending sides extending radially into the opening, said backing portion including a plurality of parallel spacedly related wedge surfaces adjacent to one of said longitudinally extending side, said wedge surfaces each oriented at an acute angle to the axis of the elongated body member, a groove formed extending into said one longitudinally extending side of the backing portion, an edge defining one side of the groove forming a cam surface, the cam surface being oriented at an acute angle relative to the axis of the elongated body member,
• cooperatively engageable means on the stone assembly and on the body member to prevent relative axial movement therebetween, and
• an adjusting member located in the passageway of said elongated body member adjacent to said one longitudinally extending side of the backing portion of the stone assembly, said adjusting member having a plurality of parallel spacedly related wedge surfaces positioned and oriented for surface to surface contact respectively with the plurality of wedge surfaces on said backing portion, movement of said adjusting member in one axial direction in the passageway slidably moving the wedge surfaces of the adjusting member relative to the wedge surfaces on the backing portion to move the stone assembly radially outwardly relative to the elongated body, the adjusting member having a tab portion extending sidewardly therefrom and into the groove in the backing portion, movement of the adjusting member in a second axial direction opposite said one axial direction slidably engaging and moving the tab portion along the cam surface of the groove to positively retract the stone assembly radially inwardly into said opening.

In a honing mandrel having an elongated member with a passageway extending along its length thereof and a central longitudinal axis, a work engaging member positioned in the passageway and radially movable therein, the work engaging member and the elongated member having cooperatively engageable means to prevent relative axial movement therebetween, an operator member positioned in the passageway adjacent to one side of the work engaging member and axially movable in the passageway, and cooperatively engageable means on the work engaging member and operator member for extending the work engaging member radially outwardly as the operator member is moved in a first axial direction in the passageway, the improvement comprising means on the work engaging member and on the operator member for positively retracting the work engaging member radially inwardly in the passageway including a cam surface on the work engaging member, the cam surface being oriented at an acute angle to the axis of the elongated body member and located adjacent to the operator member, and a sidewardly extending projection on the operator member cooperatively engageable with said cam surface to retain the work engaging member in the passageway, said projection slidably engaging the cam surface when the operator member is moved in a second axial direction opposite said first axial direction so as to positively retract the work engaging member radially inwardly in the passageway.

In a honing mandrel having an elongated body member having two ends, a mounting end including means for mounting for rotation on a honing machine, a work engaging end and a shank portion intermediate to the mounting end and work engaging end, a passageway extending along the length of the elongated body member and a radially facing opening to the passageway extending along at least a portion of one side of the elongated body member adjacent to the work engaging end thereof, a stone assembly located in the radially facing opening, the stone assembly having a radially outwardly facing work engaging abrasive portion and a backing portion that extends radially inwardly into the opening, the backing portion including at least one wedge surface oriented at an acute angle to the axis of the elongated body member, cooperatively engageable means on the stone assembly and on the elongated body member to prevent the stone assembly from moving axially in the passageway, and an adjusting member located in the passageway adjacent to one side of the backing portion and having at least one wedge surface positioned and oriented for surface-to-surface contact respectively with the at least one wedge surface on the backing portion of the stone assembly, movement of the adjusting member in one axial direction in the passageway slidably engaging the at least one wedge surface thereof with the at least one wedge surface of the backing portion to move the stone assembly radially outwardly relative to the elongated body, the improvement comprising containment means on the elongated body member positioned adjacent the passageway for slidably engaging the adjusting member to prevent the adjusting member from moving radially in the passageway, and means on the stone assembly and on the adjusting member for positively retaining and retracting the stone assembly including a cam surface on the side of the backing portion adjacent to the adjusting member, said cam surface being oriented at an acute angle to the axis of the elongated body member, and a sidewardly extending projection on the adjusting member cooperatively engageable with the cam surface to retain the adjusting member in the radially facing opening, said projection slidably engaging the cam surface when the stone assembly is in a radially outward position when the adjusting member is moved in a second axial direction in the passageway so as to positively draw the stone assembly radially inwardly in the opening.

An expandable rotatable honing mandrel including an elongated body rotatable about a longitudinal axis and having a passageway extending longitudinally along one side thereof, a work engaging assembly positioned in the passageway, the work engaging assembly having a radially outer work engaging portion and a radially inner backing portion having opposite longitudinally extending sides extending radially into the passageway, a pair of parallel spaced wedge surfaces on the backing portion adjacent one longitudinally extending side oriented at an acute angle relative to the axis of the body, an operator member positioned for longitudinal movement in the body passageway and having one side adjacent said one longitudinally extending side of the backing portion of the work engaging assembly, said operator member having wedge surface portions on said one adjacent side thereof engageable surface-to-surface with the acutely angularly oriented wedge surfaces on the backing portion so that longitudinal movements of the operator member in one direction in the passageway produces radial outward movement of the work engaging assembly, said work engaging assembly having a groove formed in said one longitudinally extending side, the groove having an inclined groove portion and an axially extending groove portion, a cam surface forming one edge of the inclined groove portion oriented at an acute angle relative to the axis of the body and facing oppositely relative to the wedge surfaces on the backing portion, a tab portion extending sidewardly from said adjacent side of the operator member and into the groove, the tab portion being engageable with the cam surface to retain the work engaging assembly in the passageway when the work engaging assembly is in a radially outwardly extended position, the tab portion being slidably engageable with the cam surface when the operator member is moved in a second opposite longitudinal direction to retract the work engaging assembly radially inwardly into the passageway, and the tab portion being movable along the axially extending portion of the groove when the work engaging assembly is in a fully retracted position.