US20210339362A1 - Tool bit holder - Google Patents
Tool bit holder Download PDFInfo
- Publication number
- US20210339362A1 US20210339362A1 US17/374,233 US202117374233A US2021339362A1 US 20210339362 A1 US20210339362 A1 US 20210339362A1 US 202117374233 A US202117374233 A US 202117374233A US 2021339362 A1 US2021339362 A1 US 2021339362A1
- Authority
- US
- United States
- Prior art keywords
- tool bit
- inner sleeve
- longitudinal bore
- detent
- shank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 230000004323 axial length Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/0007—Connections or joints between tool parts
- B25B23/0035—Connection means between socket or screwdriver bit and tool
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
- B23B31/107—Retention by laterally-acting detents, e.g. pins, screws, wedges; Retention by loose elements, e.g. balls
- B23B31/1071—Retention by balls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/02—Arrangements for handling screws or nuts
- B25B23/08—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation
- B25B23/12—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using magnetic means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2231/00—Details of chucks, toolholder shanks or tool shanks
- B23B2231/04—Adapters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2260/00—Details of constructional elements
- B23B2260/10—Magnets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B35/00—Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods
Definitions
- the present invention relates to tool bit holders, more particularly to quick-release tool bit holders for use with rotary power tools.
- bit holders In which different tool bits are receivable. Such bit holders axially secure tool bits therein by one or more ball detents, which when released permit removal of the tool bit from the bit holder.
- a tool bit holder including an inner sleeve in which a longitudinal bore is defined in which a tool bit is receivable, a detent engageable with the tool bit for locking the tool bit within the longitudinal bore, an outer sleeve surrounding the inner sleeve and movable relative to the inner sleeve between a locking position, in which the detent is engaged with the tool bit for locking the tool bit within the longitudinal bore, and a release position, in which the detent may be disengaged from the tool bit to permit removal of the tool bit from the longitudinal bore, and a spring positioned between the inner sleeve and the outer sleeve. The spring biases the outer sleeve toward the locking position
- a tool bit holder including an inner sleeve in which a longitudinal bore is defined in which a tool bit is receivable, a shank received in the longitudinal bore of the inner sleeve, first and second radial bores each extending through the inner sleeve, between an outer periphery of the inner sleeve and the longitudinal bore, first and second detents received, respectively, in the first and second radial bores, the first detent being engageable with the tool bit for locking the tool bit within the longitudinal bore, an outer sleeve surrounding the inner sleeve and movable relative to the inner sleeve between a locking position, in which the first detent is engaged with the tool bit for locking the tool bit within the longitudinal bore, and a release position, in which the first detent may be disengaged from the tool bit to permit removal of the tool bit from the longitudinal bore, one of a circumferential groove or a notch in an outer periphery of the sh
- the present invention provides, in yet another aspect, a method of operating a tool bit holder.
- the method includes inserting a tool bit into a longitudinal bore of an inner sleeve until a rear of the tool bit abuts a detent positioned within a radial bore through the inner sleeve, sliding the inner sleeve in a rearward direction relative to an outer sleeve surrounding the inner sleeve, compressing a spring into a retracted position with the sliding inner sleeve while the outer sleeve remains stationary, pushing the ball detent with the rear of the tool bit radially outward into a channel in the outer sleeve, permitting continued insertion of the tool bit into the longitudinal bore, and releasing the spring in response to the ball detent disengaging the rear of the tool bit, permitting the spring to rebound to an extended position and push the inner sleeve in a forward direction toward a locked position in which the outer sleeve displaces the ball detent at
- FIG. 1 is a cross-sectional view of a tool bit holder in accordance with an embodiment of the invention.
- FIG. 2 is a cross-sectional view of the tool bit holder of FIG. 1 , illustrating insertion of a tool bit.
- FIG. 3 is a cross-sectional view of the tool bit holder of FIG. 1 , illustrating the tool bit fully inserted in the tool bit holder
- FIG. 4 is a cross-sectional view of the tool bit holder of FIG. 1 , illustrating the tool bit being removed.
- FIG. 5 is an exploded perspective view of the tool bit holder of FIG. 1 .
- FIG. 6 is a perspective cutaway view of a tool bit holder in accordance with another embodiment of the invention.
- FIGS. 1 and 2 illustrate a tool bit holder 10 for adapting different types and sizes of tool bits 12 for use with a rotary power tool (e.g., drill driver, an impact driver, etc.).
- a rotary power tool e.g., drill driver, an impact driver, etc.
- Such tool bits 12 are interchangeably coupled to the bit holder 10 without the use of tools.
- the bit holder 10 includes an inner sleeve 14 , an outer sleeve 18 surrounding the inner sleeve 14 and slidable relative to the inner sleeve 14 , and a shank 22 upon which both the inner sleeve 14 and the outer sleeve 18 are supported.
- the shank 22 includes a hexagonal cross-sectional shape and a circumferential groove 26 in which a ball detent of a quick-release mechanism of the rotary power tool is receivable for axially securing the bit holder 10 to the rotary power tool.
- the shank 22 may be clamped by multiple jaws of a drill chuck.
- the inner sleeve 14 includes a longitudinal bore 30 defining a longitudinal axis 34 coaxial with the shank 22 .
- the bore 30 includes a hexagonal cross-sectional shape corresponding to that of the shank 22 , thereby providing a snug sliding fit between the inner sleeve 14 and the shank 22 .
- the bore 30 also extends through the inner sleeve 14 , defining opposite front and rear openings 38 , 42 . Tool bits 12 are receiveable through the front opening 38 , whereas the shank 22 protrudes from the rear opening 42 .
- the tool holder 10 also includes first and second pluralities of radial bores 46 a , 46 b spaced axially from each other along the axis 34 , and first and second pluralities of ball detents 50 a , 50 b received in the radial bores 46 a , 46 b , respectively.
- the bores 46 a , 46 b extend radially through the inner sleeve 14 , between a cylindrical outer periphery of the inner sleeve 14 and the bore 30 .
- the radial bore 46 a tapers in a radially inward direction, thereby defining openings into the bore 30 having a smaller diameter than the diameters of the respective ball detents 50 a received in the bore 46 a . Therefore, the ball detents 50 a , 50 b are prevented from falling into the bore 30 .
- the bores 46 a are spaced approximately 120 degrees apart from each other. Alternatively, the bores 46 a may be spaced approximately 180 degrees apart from each other.
- the bores 46 b are spaced 180 degrees apart from each other for receipt of two of the ball detents 50 b .
- the bores 46 b are cylindrical and have a diameter nominally greater than that of the ball detents 50 b .
- only a single bore 46 b and ball detent 50 b may be used.
- the ball detents 50 b are received within a circumferential groove 54 in the shank 22 having an axial length L.
- the ball detents 50 b are received within corresponding, discrete notches 78 in the shank 22 rather than a circumferential groove 54 .
- the outer sleeve 18 includes a cylindrical inner periphery 18 a corresponding to a cylindrical outer periphery 14 a of the inner sleeve 14 , thereby providing a snug sliding fit between the outer sleeve 18 and the inner sleeve 14 .
- the outer sleeve 18 also includes a rear end 58 having a round aperture 62 through which the shank 22 extends.
- the aperture 62 may be substantially hexagonal.
- the bit holder 10 further includes a retaining ring 66 secured to the shank 22 against which the rear end 58 of the outer sleeve 18 is abuttable and a spring 70 seated between an internal shoulder 90 defined by the rear end 58 of the outer sleeve 18 and a rear end 94 of the inner sleeve 14 .
- the spring 70 also surrounds the shank 22 . As such, the spring 70 is located within an annular chamber 98 defined by the shank 22 , the cylindrical inner periphery 18 a of the outer sleeve 18 , the rear end 94 of the inner sleeve 14 , and the shoulder 90 on the outer sleeve 18 .
- the spring 70 biases the rear end 58 of the outer sleeve 18 against the retaining ring 66 and the inner sleeve 14 and the outer sleeve 18 apart from each other.
- the outer sleeve 18 also includes a channel 74 in the cylindrical inner periphery of the outer sleeve 18 proximate the radial bores 46 a .
- the outer sleeve 18 displaces the ball detents 50 a radially inward to protrude into the longitudinal bore 30 and clamp against a tool bit 12 to axially secure the tool bit 12 within the bore 30 .
- the ball detents 50 a are biased radially inward to protrude into the bore 30 by the spring 70 .
- the outer sleeve 18 is slidable relative to the inner sleeve 14 from its locking position to a “release” position ( FIG. 2 ), against the bias of the spring 70 , to align the channel 74 with the ball detents 50 a .
- the ball detents 50 a are at least partially receiveable in the channel 74 , and are also removed from the bore 30 . Therefore, the clamping force applied to the tool bit 12 is released, permitting it to be removed from the bit holder 10 .
- the ball detents 50 b are continuously engaged with the cylindrical inner periphery 18 a of the outer sleeve 18 , regardless of its position. Therefore, the ball detents 50 b are maintained within the circumferential groove 54 when the outer sleeve 18 is in the locking position and the release position.
- FIG. 1 illustrates the tool bit holder 10 with the outer sleeve 18 in the locking position and without a tool bit 12 received in the holder 10 .
- the ball detents 50 a radially protrude into the bore 30 .
- the spring 70 is situated within the chamber 98 in an extended position.
- a rear 12 a of the tool bit 12 contacts the ball detents 50 a . Because the ball detents 50 a are misaligned with the channel 74 , they cannot be radially displaced from the bore 30 .
- the spring 70 rebounds towards the extended position to push the inner sleeve 14 forward toward a locked position, driving the ball detents 50 a into a wedged or clamped position between the cylindrical inner periphery 18 a of the outer sleeve 18 and the tool bit 12 .
- the inner sleeve 14 is displaced forward, the outer sleeve 18 remains stationary in the locking position relative to the shank 22 .
- the spring 70 may rebound to push the inner sleeve 14 forward by less than the displacement D, causing the ball detents 50 a to wedge against a conical interior surface 74 a ( FIG. 1 ) transitioning the channel 74 to the cylindrical inner periphery 18 a.
- the illustrated embodiment of the holder 10 also includes a magnet 86 coupled to an end of the shank 22 within the bore 30 for retaining a tool bit 12 within the bore 30 . Therefore, the magnet 86 may retain the tool bit 12 within the bore 30 even when the outer sleeve 18 is in the release position. In this manner, the tool bit 12 cannot fall out of the bore 30 once the outer sleeve 18 is moved to the release position. Rather, the user must grasp the tool bit 12 and pull it from the bore 30 for removal. Alternatively, the magnet 86 may be omitted from the holder 10 .
Abstract
A tool bit holder includes an inner sleeve in which a longitudinal bore is defined in which a tool bit is receivable and a detent is engageable with the tool bit for locking the tool bit within the longitudinal bore. An outer sleeve surrounds the inner sleeve and is movable relative to the inner sleeve between a locking position, in which the detent is engaged with the tool bit for locking the tool bit within the longitudinal bore, and a release position, in which the detent may be disengaged from the tool bit to permit removal of the tool bit from the longitudinal bore. A spring is positioned between the inner sleeve and the outer sleeve. The spring biases the outer sleeve toward the locking position
Description
- This application is a continuation of co-pending U.S. patent application Ser. No. 16/517,110 filed on Jul. 19, 2019, now U.S. Pat. No. 11,065,744, which claims foreign priority to Chinese Patent Application No. 201810804116.9 filed on Jul. 20, 2018, the entire contents of all of which are incorporated herein by reference.
- The present invention relates to tool bit holders, more particularly to quick-release tool bit holders for use with rotary power tools.
- To facilitate tool bit changes during a work operation, rotary power tools often use quick-release bit holders in which different tool bits are receivable. Such bit holders axially secure tool bits therein by one or more ball detents, which when released permit removal of the tool bit from the bit holder.
- The present invention provides, in one aspect, a tool bit holder including an inner sleeve in which a longitudinal bore is defined in which a tool bit is receivable, a detent engageable with the tool bit for locking the tool bit within the longitudinal bore, an outer sleeve surrounding the inner sleeve and movable relative to the inner sleeve between a locking position, in which the detent is engaged with the tool bit for locking the tool bit within the longitudinal bore, and a release position, in which the detent may be disengaged from the tool bit to permit removal of the tool bit from the longitudinal bore, and a spring positioned between the inner sleeve and the outer sleeve. The spring biases the outer sleeve toward the locking position
- The present invention provides, in another aspect, a tool bit holder including an inner sleeve in which a longitudinal bore is defined in which a tool bit is receivable, a shank received in the longitudinal bore of the inner sleeve, first and second radial bores each extending through the inner sleeve, between an outer periphery of the inner sleeve and the longitudinal bore, first and second detents received, respectively, in the first and second radial bores, the first detent being engageable with the tool bit for locking the tool bit within the longitudinal bore, an outer sleeve surrounding the inner sleeve and movable relative to the inner sleeve between a locking position, in which the first detent is engaged with the tool bit for locking the tool bit within the longitudinal bore, and a release position, in which the first detent may be disengaged from the tool bit to permit removal of the tool bit from the longitudinal bore, one of a circumferential groove or a notch in an outer periphery of the shank in which the second detent is received to limit axial displacement of the inner sleeve relative to the shank to a distance less than an axial length of the circumferential groove or notch, and a spring positioned between the inner sleeve and the outer sleeve. The spring biases the outer sleeve toward the locking position.
- The present invention provides, in yet another aspect, a method of operating a tool bit holder. The method includes inserting a tool bit into a longitudinal bore of an inner sleeve until a rear of the tool bit abuts a detent positioned within a radial bore through the inner sleeve, sliding the inner sleeve in a rearward direction relative to an outer sleeve surrounding the inner sleeve, compressing a spring into a retracted position with the sliding inner sleeve while the outer sleeve remains stationary, pushing the ball detent with the rear of the tool bit radially outward into a channel in the outer sleeve, permitting continued insertion of the tool bit into the longitudinal bore, and releasing the spring in response to the ball detent disengaging the rear of the tool bit, permitting the spring to rebound to an extended position and push the inner sleeve in a forward direction toward a locked position in which the outer sleeve displaces the ball detent at least partially into the longitudinal bore to prevent removal of the tool bit therefrom.
- Other aspects of the invention will become apparent by consideration of the detailed description and accompanying drawings.
-
FIG. 1 is a cross-sectional view of a tool bit holder in accordance with an embodiment of the invention. -
FIG. 2 is a cross-sectional view of the tool bit holder ofFIG. 1 , illustrating insertion of a tool bit. -
FIG. 3 is a cross-sectional view of the tool bit holder ofFIG. 1 , illustrating the tool bit fully inserted in the tool bit holder -
FIG. 4 is a cross-sectional view of the tool bit holder ofFIG. 1 , illustrating the tool bit being removed. -
FIG. 5 is an exploded perspective view of the tool bit holder ofFIG. 1 . -
FIG. 6 is a perspective cutaway view of a tool bit holder in accordance with another embodiment of the invention. - Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
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FIGS. 1 and 2 illustrate atool bit holder 10 for adapting different types and sizes oftool bits 12 for use with a rotary power tool (e.g., drill driver, an impact driver, etc.).Such tool bits 12 are interchangeably coupled to thebit holder 10 without the use of tools. Thebit holder 10 includes aninner sleeve 14, anouter sleeve 18 surrounding theinner sleeve 14 and slidable relative to theinner sleeve 14, and ashank 22 upon which both theinner sleeve 14 and theouter sleeve 18 are supported. Theshank 22 includes a hexagonal cross-sectional shape and acircumferential groove 26 in which a ball detent of a quick-release mechanism of the rotary power tool is receivable for axially securing thebit holder 10 to the rotary power tool. Alternatively, theshank 22 may be clamped by multiple jaws of a drill chuck. - The
inner sleeve 14 includes alongitudinal bore 30 defining alongitudinal axis 34 coaxial with theshank 22. Thebore 30 includes a hexagonal cross-sectional shape corresponding to that of theshank 22, thereby providing a snug sliding fit between theinner sleeve 14 and theshank 22. Thebore 30 also extends through theinner sleeve 14, defining opposite front andrear openings Tool bits 12 are receiveable through the front opening 38, whereas theshank 22 protrudes from therear opening 42. - As previously stated, the
inner sleeve 14 is slidable relative to theshank 22 along thelongitudinal axis 34. Thetool holder 10 also includes first and second pluralities ofradial bores axis 34, and first and second pluralities ofball detents radial bores bores inner sleeve 14, between a cylindrical outer periphery of theinner sleeve 14 and thebore 30. The radial bore 46 a tapers in a radially inward direction, thereby defining openings into thebore 30 having a smaller diameter than the diameters of therespective ball detents 50 a received in thebore 46 a. Therefore, the ball detents 50 a, 50 b are prevented from falling into thebore 30. As shown inFIG. 5 , thebores 46 a are spaced approximately 120 degrees apart from each other. Alternatively, thebores 46 a may be spaced approximately 180 degrees apart from each other. - In the illustrated embodiment of the
tool bit holder 10, thebores 46 b are spaced 180 degrees apart from each other for receipt of two of theball detents 50 b. Unlike thebores 46 a, thebores 46 b are cylindrical and have a diameter nominally greater than that of theball detents 50 b. Alternatively, only asingle bore 46 b and ball detent 50 b may be used. As shown inFIGS. 1-4 , theball detents 50 b are received within acircumferential groove 54 in theshank 22 having an axial length L. In an alternative embodiment of the tool bit holder 100 shown inFIG. 6 , theball detents 50 b are received within corresponding,discrete notches 78 in theshank 22 rather than acircumferential groove 54. - With reference to
FIGS. 1 and 2 , theouter sleeve 18 includes a cylindricalinner periphery 18 a corresponding to a cylindricalouter periphery 14 a of theinner sleeve 14, thereby providing a snug sliding fit between theouter sleeve 18 and theinner sleeve 14. Theouter sleeve 18 also includes arear end 58 having around aperture 62 through which theshank 22 extends. In alternative embodiments (not shown), theaperture 62 may be substantially hexagonal. Thebit holder 10 further includes aretaining ring 66 secured to theshank 22 against which therear end 58 of theouter sleeve 18 is abuttable and aspring 70 seated between aninternal shoulder 90 defined by therear end 58 of theouter sleeve 18 and arear end 94 of theinner sleeve 14. Thespring 70 also surrounds theshank 22. As such, thespring 70 is located within anannular chamber 98 defined by theshank 22, the cylindricalinner periphery 18 a of theouter sleeve 18, therear end 94 of theinner sleeve 14, and theshoulder 90 on theouter sleeve 18. Because the placement of the ball detents 50 b in thecircumferential groove 54 limits axial movement of theinner sleeve 14 relative to theshank 22 to a displacement D that is less than the axial length L of thegroove 54, thespring 70 biases therear end 58 of theouter sleeve 18 against theretaining ring 66 and theinner sleeve 14 and theouter sleeve 18 apart from each other. - The
outer sleeve 18 also includes achannel 74 in the cylindrical inner periphery of theouter sleeve 18 proximate theradial bores 46 a. When thechannel 74 is misaligned with theball detents 50 a coinciding with a “locking” position of theouter sleeve 18 as shown inFIG. 1 , theouter sleeve 18 displaces theball detents 50 a radially inward to protrude into thelongitudinal bore 30 and clamp against atool bit 12 to axially secure thetool bit 12 within thebore 30. In the illustrated embodiment, theball detents 50 a are biased radially inward to protrude into thebore 30 by thespring 70. Theouter sleeve 18 is slidable relative to theinner sleeve 14 from its locking position to a “release” position (FIG. 2 ), against the bias of thespring 70, to align thechannel 74 with theball detents 50 a. When aligned, the ball detents 50 a are at least partially receiveable in thechannel 74, and are also removed from thebore 30. Therefore, the clamping force applied to thetool bit 12 is released, permitting it to be removed from thebit holder 10. - In contrast, the
ball detents 50 b are continuously engaged with the cylindricalinner periphery 18 a of theouter sleeve 18, regardless of its position. Therefore, theball detents 50 b are maintained within thecircumferential groove 54 when theouter sleeve 18 is in the locking position and the release position. -
FIG. 1 illustrates thetool bit holder 10 with theouter sleeve 18 in the locking position and without atool bit 12 received in theholder 10. As stated above, when theouter sleeve 18 is in the locking position, the ball detents 50 a radially protrude into thebore 30. Additionally, thespring 70 is situated within thechamber 98 in an extended position. Upon insertion of thetool bit 12 into thebore 30, a rear 12 a of thetool bit 12 contacts theball detents 50 a. Because theball detents 50 a are misaligned with thechannel 74, they cannot be radially displaced from thebore 30. Rather, continued rearward movement of thetool bit 12 causes theinner sleeve 14 to slide relative to theshank 22 while theouter sleeve 18 remains stationary in the locking position, compressing thespring 70 into a retracted position. After theinner sleeve 14 is displaced by the amount D, theball detents 50 a are pushed radially outward into thechannel 74 of theouter sleeve 18, removing theball detents 50 a from thebore 30 and creating a sufficient amount of clearance for thetool bit 12 to be inserted past theball detents 50 a. Upon theball detents 50 a encountering acircumferential groove 82 in thetool bit 12, thespring 70 rebounds towards the extended position to push theinner sleeve 14 forward toward a locked position, driving theball detents 50 a into a wedged or clamped position between the cylindricalinner periphery 18 a of theouter sleeve 18 and thetool bit 12. While theinner sleeve 14 is displaced forward, theouter sleeve 18 remains stationary in the locking position relative to theshank 22. Alternatively, thespring 70 may rebound to push theinner sleeve 14 forward by less than the displacement D, causing theball detents 50 a to wedge against a conical interior surface 74 a (FIG. 1 ) transitioning thechannel 74 to the cylindricalinner periphery 18 a. - To release the
bit 12, theouter sleeve 18 is pulled towards thefront opening 38 against the bias of thespring 70 toward its release position, aligning thechannel 74 in theouter sleeve 18 with theball detents 50 a, permitting radially outward movement of theball detents 50 a and removal of thetool bit 12. The illustrated embodiment of theholder 10 also includes amagnet 86 coupled to an end of theshank 22 within thebore 30 for retaining atool bit 12 within thebore 30. Therefore, themagnet 86 may retain thetool bit 12 within thebore 30 even when theouter sleeve 18 is in the release position. In this manner, thetool bit 12 cannot fall out of thebore 30 once theouter sleeve 18 is moved to the release position. Rather, the user must grasp thetool bit 12 and pull it from thebore 30 for removal. Alternatively, themagnet 86 may be omitted from theholder 10. - Various features of the invention are set forth in the following claims.
Claims (20)
1. A tool bit holder comprising:
an inner sleeve in which a longitudinal bore is defined in which a tool bit is receivable;
a shank received in the longitudinal bore of the inner sleeve;
a first detent engageable with the tool bit for locking the tool bit within the longitudinal bore;
a second detent received in a circumferential groove of the shank; and
an outer sleeve surrounding the inner sleeve and movable relative to the inner sleeve between a locking position, in which the first detent is engaged with the tool bit for locking the tool bit within the longitudinal bore, and a release position, in which the first detent may be disengaged from the tool bit to permit removal of the tool bit from the longitudinal bore, wherein the second detent is maintained in the circumferential groove in the locking position and the release position by the outer sleeve.
2. The tool bit holder of claim 1 , wherein the longitudinal bore includes a hexagonal cross-sectional shape, and wherein the shank includes a hexagonal outer periphery slidably received in the longitudinal bore along a longitudinal axis of the inner sleeve.
3. The tool bit holder of claim 1 , wherein the second detent limits axial displacement of the inner sleeve relative to the shank.
4. The tool bit holder of claim 3 , further comprising first and second radial bores each extending through the inner sleeve, between an outer periphery of the inner sleeve and the longitudinal bore, in which the first and second detents are received, respectively.
5. The tool bit holder of claim 1 , wherein the circumferential groove is a notch.
6. The tool bit holder of claim 1 , further comprising a spring positioned between the inner sleeve and the outer sleeve, wherein the spring biases the outer sleeve toward the locking position.
7. The tool bit holder of claim 6 , wherein the spring surrounds the shank.
8. The tool bit holder of claim 1 , further comprising a radial bore extending through the inner sleeve, between an outer periphery of the inner sleeve and the longitudinal bore, and wherein the first detent is received in the radial bore.
9. The tool bit holder of claim 1 , further comprising a shank received in the longitudinal bore of the inner sleeve.
10. A tool bit holder comprising:
an inner sleeve in which a longitudinal bore is defined in which a tool bit is receivable;
a shank received in the longitudinal bore of the inner sleeve;
a first detent engageable with the tool bit for locking the tool bit within the longitudinal bore;
a second detent received in a circumferential groove of the shank;
an outer sleeve surrounding the inner sleeve and movable relative to the inner sleeve between a locking position, in which the first detent is engaged with the tool bit for locking the tool bit within the longitudinal bore, and a release position, in which the first detent may be disengaged from the tool bit to permit removal of the tool bit from the longitudinal bore; and
a retaining ring secured to the shank, wherein the outer sleeve is abuttable against the retaining ring to limit axial displacement of the outer sleeve relative to the shank.
11. The tool bit holder of claim 10 , wherein the longitudinal bore includes a hexagonal cross-sectional shape, and wherein the shank includes a hexagonal outer periphery slidably received in the longitudinal bore along a longitudinal axis of the inner sleeve.
12. The tool bit holder of claim 10 , wherein the second detent limits axial displacement of the inner sleeve relative to the shank.
13. The tool bit holder of claim 12 , further comprising first and second radial bores each extending through the inner sleeve, between an outer periphery of the inner sleeve and the longitudinal bore, in which the first and second detents are received, respectively.
14. The tool bit holder of claim 10 , wherein the circumferential groove is a notch.
15. The tool bit holder of claim 10 , further comprising a spring positioned between the inner sleeve and the outer sleeve, wherein the spring biases the outer sleeve toward the locking position.
16. The tool bit holder of claim 15 , wherein the spring surrounds the shank.
17. A method of operating a tool bit holder, the method comprising:
inserting a tool bit into a longitudinal bore of an inner sleeve until a rear of the tool bit abuts a first detent positioned within a radial bore through the inner sleeve;
sliding the inner sleeve in a rearward direction relative to an outer sleeve surrounding the inner sleeve, thereby pushing a second detent in the rearward direction along a circumferential groove of a shank;
pushing the first detent with the rear of the tool bit radially outward into a channel in the outer sleeve, permitting continued insertion of the tool bit into the longitudinal bore; and
pushing the inner sleeve in a forward direction toward a locked position in which the outer sleeve displaces the first detent at least partially into the longitudinal bore to prevent removal of the tool bit therefrom and pushing the second detent in the forward direction along the circumferential groove of the shank.
18. The method of claim 17 , further comprising compressing a spring into a retracted position with the sliding inner sleeve while the outer sleeve remains stationary.
19. The method of claim 18 , further comprising releasing the spring in response to the first detent disengaging the rear of the tool but, permitting the spring to rebound to an extended position and pushing the inner sleeve in the forward direction.
20. The method of claim 19 , further comprising:
pulling the outer sleeve in a forward direction towards an opening of the longitudinal bore, with the inner sleeve remaining stationary, against the bias of the spring;
aligning the channel in the outer sleeve with the first detent; and
removing tool bit from the longitudinal bore, thereby pushing the first detent radially outward into the channel and out of the longitudinal bore.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US17/374,233 US20210339362A1 (en) | 2018-07-20 | 2021-07-13 | Tool bit holder |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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CN201810804116.9 | 2018-07-20 | ||
CN201810804116.9A CN110732888B (en) | 2018-07-20 | 2018-07-20 | Tool bit holder |
US16/517,110 US11065744B2 (en) | 2018-07-20 | 2019-07-19 | Tool bit holder |
US17/374,233 US20210339362A1 (en) | 2018-07-20 | 2021-07-13 | Tool bit holder |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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WO2023104395A1 (en) * | 2021-12-10 | 2023-06-15 | Atlas Copco Industrial Technique Ab | Power tool with coupling mechanism |
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US11325230B2 (en) * | 2020-01-06 | 2022-05-10 | SHIN YING ENTPR Co., Ltd. | Tool extension rod |
AU2021204011B1 (en) * | 2021-06-17 | 2022-09-22 | Unitek Enterprise Corp. | Tool Connecting Rod |
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2021
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WO2023104395A1 (en) * | 2021-12-10 | 2023-06-15 | Atlas Copco Industrial Technique Ab | Power tool with coupling mechanism |
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CN110732888B (en) | 2022-07-26 |
CN110732888A (en) | 2020-01-31 |
US11065744B2 (en) | 2021-07-20 |
US20200023502A1 (en) | 2020-01-23 |
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