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US 6,062,574 AGranted
Tool bit holder
OwnerRick Yordeinventor
Life of this patent
Estimating the term…
Abstract
A tool bit holder having a collet nut engageable with a rotary and/or reciprocating output shaft having a hollow free end with a collet, having jaws with respective head and shank portions, disposed in the hollow interior of the collet nut and an annular expansion insert member having an aperture of a diameter greater than the diameter of the hollow free end of the tool output shaft through which the shank portion of the collet jaws extend, with the expansion insert member having a proximal end engageable with the free end of the output shaft and a distal end engageable with the heads of the collet jaws, provides improved capacity for the tool bit holder to accommodate a greater range of tool bit sizes.
Claims26
A tool bit holder for use with a tool having an output shaft with a proximal end and a distal end, the output shaft having a hollow portion of predetermined diameter adjacent its distal end, and having a threaded portion, the tool bit holder comprising:
- a collet nut having a threaded portion for threaded engagement with the threaded portion of the tool output shaft, and having a hollow interior at least a portion of which is of greater diameter than the predetermined diameter of the outer diameter of the output shaft, and having an interiorly disposed camming surface;
- a collet disposed in said hollow interior portion of the collet nut and having a plurality of radially disposed resilient jaws each having a head portion with an interior diameter and a shank portion, with the head portions having a first camming surface for camming engagement with the interiorly disposed camming surface of the collet nut, and the head portions having a second camming surface, and with the shank portions having a common free end which is receivable in said output shaft hollow portion;
- an annular expansion insert member disposed in said hollow interior of the collet nut and having an aperture through which the shank portions of the collet pass, said insert member aperture having a diameter substantially greater than the outer diameter of the collet shank portion to permit outward flexure of the shank portions, the expansion insert member having a proximal end for bearing against the distal end of the tool output shaft and having a distal end for bearing against the second camming surfaces of the head portions of the collet, said collet nut interior being sufficiently large to permit radial expansion of the collet head portions as bit shanks with larger diameters than the collet head portion interior diameter are inserted into the collet.
A tool bit holder for use with a tool having an output shaft with a proximal end and a distal end, the output shaft having a hollow portion of predetermined diameter adjacent its distal end, and having a threaded portion, the tool bit holder comprising:
- a collet nut having a threaded portion for threaded engagement with the threaded portion of the tool output shaft, and having a hollow interior at least a portion of which is of greater diameter than the predetermined diameter of the outer diameter of the output shaft, and having an interiorly disposed camming surface;
- a collet disposed in said hollow interior portion of the collet nut and having a plurality of radially disposed resilient jaws each having a head portion and a shank portion, with the head portions having a first camming surface for camming engagement with the interiorly disposed camming surface of the collet nut, and the head portions having a second camming surface, and with the shank portions having a common free end which is receivable in said output shaft hollow portion;
- an annular expansion insert member disposed in said hollow interior of the collet nut and having an aperture through which the shank portions of the collet pass, the expansion insert member having a proximal end for bearing against the distal end of the tool output shaft and having a distal end for bearing against the second camming surfaces of the head portions of the collet, including means to transiently attach the insert member with the collet nut to retain the collet in the collet nut.
A tool bit holder for use with a tool having an output shaft, comprising:
- a collet nut having a hollow interior portion and engageable with the tool output shaft;
- a collet disposed in said collet nut hollow interior portion for receiving a selected tool bit;
- and an annular expansion insert member having an aperture through which the collet extends, including means to transiently attach the annular expansion insert member in the collet nut hollow interior portion to hold the collet from falling out of the collet nut.
A tool for engaging a selected tool bit, the tool comprising:
- a tool housing;
- an output shaft supported by the tool housing having a proximal end and a distal end with the output shaft having a hollow portion of predetermined diameter adjacent its distal end, and having a threaded portion;
- a collet nut having a threaded portion for threaded engagement with the threaded portion of the tool output shaft, and having a hollow interior at least a portion of which is of greater diameter than the predetermined diameter of the outer diameter of the output shaft, and having a interiorly disposed camming surface;
- a collet disposed in said hollow interior portion of the collet nut and having a plurality of radially disposed resilient jaws each having a head portion with an interior diameter and a shank portion, with the head portions having a first camming surface for camming engagement with the interiorly disposed camming surface of the collet nut, and the head portions having a second camming surface, and with the shank portions having a common free end which is receivable in said output shaft hollow portion;
- an annular expansion insert member disposed in said hollow interior of the collet nut and having an aperture through which the shank portions of the collet pass, said insert member aperture having a diameter substantially greater than the outer diameter of the collet shank portion to permit outward flexure of the shank portions, the expansion insert member having a proximal end for bearing against the distal end of the tool output shaft, and having a distal end for bearing against the second camming surfaces of the head portions of the collet, said collet nut interior being sufficiently large to permit radial expansion of the collet head portions as bit shanks with larger diameters than the collet head portion interior diameter are inserted into the collet.
2 more elements
A power tool having a collet assembly for securing a wider variety of tool shanks, comprising:
- a tool body having an output spindle with a threaded distal end, a collet receiving bore in the distal end of the spindle, a collet received in the bore having a distal end with a plurality of radially expandable and contractable jaw portions, and a proximal shank end with a plurality of radially expandable and contractable shank portions, first cam means on the distal end of the spindle for engaging and camming the jaw portions, a collet nut threadedly engaging the spindle distal end and having a second cam means for engaging and camming the jaw portions, and means to accommodate larger diameter tool shanks including a central bore through the collet with a plurality of communicating radial slots extending through the jaw portions and the shank portions, said central bore in the collet being tapered from the distal end of the jaw portions to the proximal end of the jaw portions to permit larger diameter tool shanks to engage the inner surfaces of the jaw portions and spread the jaw portions as the larger diameter tool shanks are inserted into the collet, said collet nut having a hollow interior portion of sufficient diameter to enable the jaw portions to expand as the larger diameter shanks spread the jaw portions upon bit insertion.
A one-piece collet for receiving and clamping larger diameter tool shanks, comprising:
- a one-piece collet member having a central bore therethrough and a plurality of radial slots extending therefrom defining flexible, distal law portions and connected proximal shank portions, said central bore having a tapered portion adjacent the jaw portions with a larger diameter adjacent the distal end of the tapered portion, and a small diameter adjacent the proximal end of the tapered portion, said larger diameter of the tapered bore portion being selected about equal to the largest diameter tool shank usable with the collet to engage upon insertion into the tapered bore portion and cause the jaw portions to spread outwardly, said radial slots adjacent the jaw portions and the shank portions being sized to cause the jaw portions after spreading to clamp into parallel contact with the largest diameter tool shank and to permit the shank portions to bow outwardly to accommodate the parallel contact of the jaw portions with the largest diameter tool shank.
Dependencies are inferred from the claim text.