US 8,746,702 B1Granted

Impact hammer tool bit retainer incorporating shielding ring

AssigneeAjax Tool Works, Inc.

InventorRobert J. Benedict

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Abstract

A retainer for holding a tool bit on an impact hammer including a shielding ring at the retainer distal end. The retainer includes an axially slidable sleeve whereby tool bits may be selectively exchanged on the retainer and whereby tool bits are secured in the retainer for use thereof. The sleeve is axially slidable toward the retainer distal end for placing the retainer in the locked or in-use position, and is axially slidable away from the distal end against the force of a spring for placing the retainer in the tool bit release position. The shielding ring extends radially beyond the axially slidable sleeve for preventing inadvertent axial movement of the sleeve to the release position by debris and/or objects which come in contact with the retainer distal end, and thereby aiding in the prevention of inadvertent release of the tool bit during use.

Claims11

Dependent claims

In a retainer for holding a tool bit on an impact hammer, wherein the retainer includes a body portion having a tool receiving distal end and an opposite end for securement to an impact hammer, a tool receiving bore extending into the body portion from an opening at said distal end, a sleeve circumscribing said retainer body, wherein said sleeve is axially slidable on said body portion toward said tool receiving distal end to a first axial position whereat a tool bit shank received in said tool receiving bore is captured therein and prevented from exiting said bore and is axially slidable on said body portion toward said tool body opposite end to a second axial position whereat a tool bit shank may be inserted into and removed from said tool receiving bore, and a spring biasing said sleeve axially toward said tool distal end and toward said sleeve first position, an improvement comprising:

a shielding ring between said tool receiving distal end and said sleeve, said shielding ring being incapable of releasing the tool bit and extending radially a distance sufficient to effectively shield said sleeve during use of the tool by preventing inadvertent axial movement of said sleeve by debris or objects which come in contact with said distal end and preventing movement of said sleeve from said first position to said second position and thereby preventing inadvertent release of the tool bit from said tool receiving bore;
wherein said shielding ring includes a through hole, said tool body portion axially extending through said shielding ring through hole and wherein said shielding ring is secured to said tool body portion near said distal end;
and,
further comprising ring clips located axially on each side of said shielding ring and detachably secured to said tool body portion, whereby said shielding ring is axially secured on said tool body portion between said ring clips.

1 more element

A retainer for holding a tool bit on an impact hammer, said retainer comprising:

a body portion having a tool receiving distal end and an opposite end, said opposite end adapted for securement to an impact hammer;
a tool receiving bore extending axially into said body portion from an opening at said distal end toward said opposite end;
a sleeve circumscribing said retainer body portion, wherein said sleeve is axially slidable on said body portion toward said tool receiving distal end to a first axial position whereat a tool bit shank received in said tool receiving bore is captured therein and prevented from exiting said bore and is axially slidable on said body portion toward said tool body opposite end to a second axial position whereat a tool bit shank may be inserted into and removed from said tool receiving bore;
a spring biasing said sleeve axially toward said tool distal end and toward said sleeve first position;
and,
a shielding ring between said tool receiving distal end and said sleeve, said shielding ring extending radially a distance sufficient to effectively shield said sleeve during use of the tool by preventing inadvertent axial movement of said sleeve by debris or objects which come in contact with said distal end and preventing movement of said sleeve from said first position to said second position and thereby preventing inadvertent release of the tool bit from said tool receiving bore;
and,
wherein said shielding ring includes a through hole, said tool body portion axially extending through said shielding ring through hole and wherein said shielding ring is secured to said tool body portion near said distal end;
and,
further comprising ring clips located axially on each side of said shielding ring and detachably secured to said tool body portion, whereby said shielding ring is axially secured on said tool body portion between said ring clips.

7 more elements

Dependencies are inferred from the claim text.