EP3109003B1 - Quick-release device for screwdriver bits - Google Patents

Quick-release device for screwdriver bits Download PDF

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Publication number
EP3109003B1
EP3109003B1 EP16000896.7A EP16000896A EP3109003B1 EP 3109003 B1 EP3109003 B1 EP 3109003B1 EP 16000896 A EP16000896 A EP 16000896A EP 3109003 B1 EP3109003 B1 EP 3109003B1
Authority
EP
European Patent Office
Prior art keywords
shank
bit
quick
sleeve
release device
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.)
Active
Application number
EP16000896.7A
Other languages
German (de)
French (fr)
Other versions
EP3109003A1 (en
Inventor
Tsung-Te Lin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
You Lu Enterprise Co Ltd
Original Assignee
You Lu Enterprise Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by You Lu Enterprise Co Ltd filed Critical You Lu Enterprise Co Ltd
Publication of EP3109003A1 publication Critical patent/EP3109003A1/en
Application granted granted Critical
Publication of EP3109003B1 publication Critical patent/EP3109003B1/en
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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

Definitions

  • the present invention relates to a quick-release device, and more particularly to a quick-release device for screwdriver bits.
  • a screwdriver bit In our daily life, a screwdriver bit is usually longitudinally mounted into a hand tool for rotating a screw or a bolt.
  • the standards of the screw/bolt are various. Consequently, the bits need to be often changed and a quick-release device for the screwdriver bit is needed for smooth operations.
  • the conventional hand tool has a ring movably sleeved on a distal end thereof for mounting the bit and multiple is steel balls are respectively radially disposed in the ring for positioning the steel balls.
  • An outer sleeve is movably sleeved on the ring for selectively inwardly pushing the steel balls to hold the inserted bit in place.
  • the inner space of the ring is limited such that to process space for/and mount steel balls is a difficult work and the processing cost of the ring is raised.
  • the ring needs to have a thick wall for ensuring the structural strength of the ring after being processed. As a result, the ring must be made thicker and the metal material is wasted and a small operating space is very inconvenient for operation.
  • the present invention has arisen to mitigate and/or obviate the disadvantages of the conventional quick-release device for screwdriver bits.
  • US8578823B2 represents the closest prior art and discloses a quick-release device for screwdriver bits, comprising: a shank having a first end and a second end, the shank having a polygonal hole longitudinally defined in the first end thereof and adapted for partially receiving a bit, wherein the bit has a groove annularly defined therein, at least one slot longitudinally defined in the first end of the shank, an annular groove defined in an inner periphery of polygonal hole and communicating with the at least one slot, an expandable limit element received in the annular groove, wherein the limit element has an outer diameter slightly smaller than a diameter of the annular groove; a tapered section annularly on an inner periphery of the annular groove toward the first end of the shank, wherein the limit element is moved with the bit when the bit is freely reversely pulled and the limit element is inwardly pushed to more tightly engage into the groove due to the tapered section such that the bit cannot be freely removing from the polygonal hole in the shank;
  • the main objective of the present invention is to provide an improved quick-release device for screwdriver bits, which has simplified structures.
  • the invention proposes a quick-release device according to claim 1.
  • a quick-release device for screwdriver bits in accordance with the present invention comprises a shank 10, a sleeve 20 movably sleeved on one end of the shank 10 and a stopper 30 is secured on one end of the shank 10 for preventing the sleeve 20 from removing from the shank 10.
  • the shank 10 has a first end and a second end.
  • the shank 10 has a polygonal hole 11 longitudinally defined in the first end of the shank 10 for partially receiving a bit 40, wherein the bit 40 has a groove 41 annularly defined therein.
  • a hollow stub 12 longitudinally extends from the first end of the shank 10 and at least one slot 13 is longitudinally defined in the hollow stub 12.
  • the hollow stub 12 has a diameter smaller than that of the shank 10 and a diametrical difference is formed between the shank 10 and the hollow stub 12, wherein the diametrical difference is equal to a thickness of the sleeve 20.
  • the hollow stub 12 has two slots 13 defined therein and the two slots 13 diametrically correspond to each other.
  • An annular groove 14 is defined in an inner periphery of the polygonal hole 11 and communicates with the at least one slot 13.
  • the annular groove 14 is formed with a tapered section 15 toward the hollow stub 12.
  • An expandable limit element 16 is received in the annular groove 14, wherein the limit element 16 has an outer diameter slightly smaller than a diameter of the annular groove 14.
  • the limit element 16 is a C-ring, an O-ring and the like.
  • the shank 10 further includes a polygonal shaft 17 extending from the second end thereof.
  • the polygonal shaft 17 is adapted to be connected to a handle (not shown) for operator to easily operate the bit 40.
  • the sleeve 20 is movably sleeved on the hollow stub 12 and reciprocally moved relative to the hollow stub 12.
  • the sleeve 20 has at least one protrusion 21 inwardly extending therefrom, wherein the at least one protrusion 21 is engaged into the at least one slot 13 to prevent the sleeve 20 from being rotated relative to the hollow stub 12.
  • the at least one protrusion 21 abuts against the limit element 16 when removing the bit 40 form the polygonal hole 11.
  • the bottom of the bit 40 is directly inserted into the polygonal hole 11 when assembling the bit 40 the quick-release device in accordance with the present invention.
  • the limit element 16 is expended due to the shank is the bit 40 after the bottom of the bit 40 passing through the limit element 16.
  • the limit element 16 directly engaged into a groove 41 peripherally defined in the bit 40 and the bottom of the bit 40 abuts a bottom of the polygonal hole 11 when the limit element 16 horizontally corresponds to the groove 41. Consequently, the operator can easily drive a screw by using the quick-release device in accordance with the present invention when the bit 41 is inserted into and positioned in the polygonal hole 11.
  • the limit element 16 is moved with the bit 40 when the bit 40 is reversely pulled.
  • the limit element 16 is inwardly pushed to more tightly engage into the groove 41 due to the tapered section 15 of the annular groove 14 in the shank 10 such that the bit 40 cannot be freely removing from the polygonal hole 11 in the shank 10.
  • the quick-release device for screwdriver bits in accordance with the present invention includes the following advantages.

Description

    BACKGROUND OF THE INVENTION 1. Field of the Invention
  • The present invention relates to a quick-release device, and more particularly to a quick-release device for screwdriver bits.
    • 2. Description of Related Art
  • In our daily life, a screwdriver bit is usually longitudinally mounted into a hand tool for rotating a screw or a bolt. However, the standards of the screw/bolt are various. Consequently, the bits need to be often changed and a quick-release device for the screwdriver bit is needed for smooth operations. The conventional hand tool has a ring movably sleeved on a distal end thereof for mounting the bit and multiple is steel balls are respectively radially disposed in the ring for positioning the steel balls. An outer sleeve is movably sleeved on the ring for selectively inwardly pushing the steel balls to hold the inserted bit in place. However, the inner space of the ring is limited such that to process space for/and mount steel balls is a difficult work and the processing cost of the ring is raised. Furthermore, the ring needs to have a thick wall for ensuring the structural strength of the ring after being processed. As a result, the ring must be made thicker and the metal material is wasted and a small operating space is very inconvenient for operation.
  • The present invention has arisen to mitigate and/or obviate the disadvantages of the conventional quick-release device for screwdriver bits.
  • US8578823B2 represents the closest prior art and discloses a quick-release device for screwdriver bits, comprising: a shank having a first end and a second end, the shank having a polygonal hole longitudinally defined in the first end thereof and adapted for partially receiving a bit, wherein the bit has a groove annularly defined therein, at least one slot longitudinally defined in the first end of the shank, an annular groove defined in an inner periphery of polygonal hole and communicating with the at least one slot, an expandable limit element received in the annular groove, wherein the limit element has an outer diameter slightly smaller than a diameter of the annular groove; a tapered section annularly on an inner periphery of the annular groove toward the first end of the shank, wherein the limit element is moved with the bit when the bit is freely reversely pulled and the limit element is inwardly pushed to more tightly engage into the groove due to the tapered section such that the bit cannot be freely removing from the polygonal hole in the shank; a sleeve movably sleeved on the first end of the shank, the sleeve having at least one protrusion inwardly extending therefrom, wherein the at least one protrusion is engaged into the at least one slot to prevent the sleeve from being rotated relative to the hollow stub, the at least one protrusion abutting against the limit element when removing the bit form the polygonal hole, a hollow stub extending longitudinally from the first end of the shank, wherein the at least one slot is longitudinally defined in the hollow stub; and a stopper for preventing the sleeve from removing from the shank.
    • SUMMARY OF THE INVENTION
  • The main objective of the present invention is to provide an improved quick-release device for screwdriver bits, which has simplified structures.
  • To achieve the objective, the invention proposes a quick-release device according to claim 1.
  • Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
    • BRIEF DESCRIPTION OF THE DRAWINGS
    • Fig. 1 is a perspective view of a quick-release device for screwdriver bits in accordance with the present invention;
    • Fig. 2 is an exploded perspective view of a quick-release device for screwdriver bits in accordance with the present invention;
    • Fig. 3 is a cross-sectional view of the quick-release device for screwdriver bits in Fig. 2;
    • Fig. 4 is a front plan view of the quick-release device for screwdriver bits in accordance with the present invention; and
    • Figs. 5 to 11 are operational views of the quick-release device for screwdriver bits in accordance with the present invention.
    DETAILED DESCRIPTION OF THE INVENTION
  • Referring to the drawings and initially to Figs. 1-4, a quick-release device for screwdriver bits in accordance with the present invention comprises a shank 10, a sleeve 20 movably sleeved on one end of the shank 10 and a stopper 30 is secured on one end of the shank 10 for preventing the sleeve 20 from removing from the shank 10.
  • The shank 10 has a first end and a second end. The shank 10 has a polygonal hole 11 longitudinally defined in the first end of the shank 10 for partially receiving a bit 40, wherein the bit 40 has a groove 41 annularly defined therein. A hollow stub 12 longitudinally extends from the first end of the shank 10 and at least one slot 13 is longitudinally defined in the hollow stub 12. In the preferred embodiment of the present invention, the hollow stub 12 has a diameter smaller than that of the shank 10 and a diametrical difference is formed between the shank 10 and the hollow stub 12, wherein the diametrical difference is equal to a thickness of the sleeve 20. The hollow stub 12 has two slots 13 defined therein and the two slots 13 diametrically correspond to each other. An annular groove 14 is defined in an inner periphery of the polygonal hole 11 and communicates with the at least one slot 13. The annular groove 14 is formed with a tapered section 15 toward the hollow stub 12. An expandable limit element 16 is received in the annular groove 14, wherein the limit element 16 has an outer diameter slightly smaller than a diameter of the annular groove 14. In the preferred embodiment of the present invention, the limit element 16 is a C-ring, an O-ring and the like. The shank 10 further includes a polygonal shaft 17 extending from the second end thereof. The polygonal shaft 17 is adapted to be connected to a handle (not shown) for operator to easily operate the bit 40.
  • The sleeve 20 is movably sleeved on the hollow stub 12 and reciprocally moved relative to the hollow stub 12. The sleeve 20 has at least one protrusion 21 inwardly extending therefrom, wherein the at least one protrusion 21 is engaged into the at least one slot 13 to prevent the sleeve 20 from being rotated relative to the hollow stub 12. The at least one protrusion 21 abuts against the limit element 16 when removing the bit 40 form the polygonal hole 11.
  • With reference to Figs. 1, 5 and 6, the bottom of the bit 40 is directly inserted into the polygonal hole 11 when assembling the bit 40 the quick-release device in accordance with the present invention. Further with reference to Fig. 9, the limit element 16 is expended due to the shank is the bit 40 after the bottom of the bit 40 passing through the limit element 16. The limit element 16 directly engaged into a groove 41 peripherally defined in the bit 40 and the bottom of the bit 40 abuts a bottom of the polygonal hole 11 when the limit element 16 horizontally corresponds to the groove 41. Consequently, the operator can easily drive a screw by using the quick-release device in accordance with the present invention when the bit 41 is inserted into and positioned in the polygonal hole 11. Under this condition, the limit element 16 is moved with the bit 40 when the bit 40 is reversely pulled. The limit element 16 is inwardly pushed to more tightly engage into the groove 41 due to the tapered section 15 of the annular groove 14 in the shank 10 such that the bit 40 cannot be freely removing from the polygonal hole 11 in the shank 10.
  • With reference to Figs. 1, 7, 8 and 11, when removing the bit 40 from the polygonal hole 11 in the shank 10, the sleeve 20 is inwardly moved relative to the shank 10 to make the at least one protrusion 21 engaged to the limit element 16. Consequently, the limit element 16 does not be moved with the bit 40 toward the tapered section 15 when the bit 40 is pulled from the polygonal hole 11 in the shank 10 such that the bit 40 in the polygonal hole 11 is removed from the shank 10 when the limit element 16 is expanded due to the moving bit 40.
  • As described above, the quick-release device for screwdriver bits in accordance with the present invention includes the following advantages.
    1. 1. Cost down: the steel balls of the conventional quick-release device for screwdriver bits is unnecessary to the quick-release device in accordance with the present invention because the quick-release device in accordance with the present invention uses a one-piece limit element, such as a marketed C-ring or an marketed O-ring, for locating the mounted bit, wherein the limit element is cheap because it is a marketed specified product such that the manufacturing cast of the quick-release device in accordance with the present invention is reduced.
    2. 2. The shank of the present invention does not need to process cavities for mounting steel balls that that the thickness of the shank is made thinner relative to the conventional quick-release device for screwdriver bits. In addition, the diametrical difference, between the shank and the sleeve, is equal to a thickness of the sleeve such that the total weight of the shank does not be raised.

Claims (4)

  1. A quick-release device for screwdriver bits, comprising:
    a shank (10) having a first end and a second end, the shank (10) having a polygonal hole (11) longitudinally defined in the first end thereof and adapted for partially receiving a bit (40), wherein the bit (40) has a groove (41) annularly defined therein, at least one slot (13) longitudinally defined in the first end of the shank (10), an annular groove (14) defined in an inner periphery of polygonal hole (11) and communicating with the at least one slot (13), an expandable limit element (16) received in the annular groove (14), wherein the limit element has an outer diameter slightly smaller than a diameter of the annular groove (14);
    a tapered section (15) annularly on an inner periphery of the annular groove (14) toward the first end of the shank (10), wherein the limit element (16) is moved with the bit (40) when the bit (40) is freely reversely pulled and the limit element (16) is inwardly pushed to more tightly engage into the groove (14) due to the tapered section (15) such that the bit (40) cannot be freely removing from the polygonal hole (11) in the shank (10);
    a sleeve (20) movably sleeved on the first end of the shank (10), the sleeve (20) having at least one protrusion (21) inwardly extending therefrom, wherein the at least one protrusion (21) is engaged into the at least one slot (13) to prevent the sleeve from being rotated relative to the shank (10), the at least one protrusion (21) abutting against the limit element (16) when removing the bit (40) form the polygonal hole (11);
    a hollow stub (12) extending longitudinally from the first end of the shank (10), wherein the at least one slot (13) is longitudinally defined in the hollow stub (12); and
    a stopper (30) secured on the first end of the hollow stub (12) for preventing the sleeve (20) from removing from the shank (10), wherein the stopper (30) surrounds the first end of the hollow stub (12) and the at least one slot (13) of the hollow stub (12).
  2. The quick-release device for screwdriver bits according to claim 1, wherein, the sleeve movably sleeved on the hollow stub (12), the hollow stub (12) having a diameter smaller than that of the shank and a diametrical difference being formed between the shank (10) and the hollow stub (12), wherein the diametrical difference is equal to a thickness of the sleeve.
  3. The quick-release device for screwdriver bits according to claim 1 or 2, wherein the shank (10) further includes a polygonal shaft extending from the second end thereof and adapted to be connected to a handle for an operator to easily operate the bit (40) that is inserted into the polygonal hole.
  4. The quick-release device for screwdriver bits according to one of the foregoing claims, wherein the limit element (16) is selected from the group consisting of C-ring and O-ring.
EP16000896.7A 2015-06-16 2016-04-21 Quick-release device for screwdriver bits Active EP3109003B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW104119369A TWI562865B (en) 2015-06-16 2015-06-16 Quick-release device for bits

Publications (2)

Publication Number Publication Date
EP3109003A1 EP3109003A1 (en) 2016-12-28
EP3109003B1 true EP3109003B1 (en) 2022-06-29

Family

ID=56101249

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16000896.7A Active EP3109003B1 (en) 2015-06-16 2016-04-21 Quick-release device for screwdriver bits

Country Status (2)

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EP (1) EP3109003B1 (en)
TW (1) TWI562865B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI823502B (en) * 2022-08-01 2023-11-21 林琮淂 End-operated quick release screwdriver bit holder

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4535658A (en) * 1982-03-05 1985-08-20 Allen Manufacturing Company Socket bit holder
DE3243389C2 (en) * 1982-11-24 1986-05-15 Wera Werk Hermann Werner Gmbh & Co, 5600 Wuppertal Chuck for non-round shaft ends of tool inserts, especially screwdriver bits
US5934384A (en) * 1998-04-27 1999-08-10 Wang; Peter Transmission shaft and bit mounting arrangement of a motor-driven hand drill
DE20211170U1 (en) * 2002-07-24 2002-10-10 Huang Daniel Quick-action chuck for a screwdriver
TWM286749U (en) * 2005-11-01 2006-02-01 Jen-Li Huang Detent structure for driving shaft
US8578823B2 (en) * 2010-10-06 2013-11-12 Simpson Strong-Tie Company Inc. Ring lock mandrel and release mechanism

Also Published As

Publication number Publication date
TW201700225A (en) 2017-01-01
EP3109003A1 (en) 2016-12-28
TWI562865B (en) 2016-12-21

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