EP3109003A1 - Quick-release device for screwdriver bits - Google Patents
Quick-release device for screwdriver bits Download PDFInfo
- Publication number
- EP3109003A1 EP3109003A1 EP16000896.7A EP16000896A EP3109003A1 EP 3109003 A1 EP3109003 A1 EP 3109003A1 EP 16000896 A EP16000896 A EP 16000896A EP 3109003 A1 EP3109003 A1 EP 3109003A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shank
- bit
- quick
- release device
- limit element
- 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.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 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
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.
- the main objective of the present invention is to provide an improved quick-release device for screwdriver bits, which has simplified structures.
- the quick-release device in accordance with the present invention comprises a shank having a first end and a second end.
- the shank has a polygonal hole longitudinally defined in the first end thereof and the polygonal hole is adapted for partially receiving a bit, wherein the bit has a groove annularly defined therein.
- At least one slot is longitudinally defined in the first end of the shank.
- An annular groove is defined in an inner periphery of the polygonal hole and communicates with the at least one slot, wherein the annular groove is formed with a tapered section toward the first end of the shank.
- An expandable limit element is received in the annular groove, wherein the limit element has an outer diameter slightly smaller than a diameter of the annular groove.
- a sleeve is movably sleeved on the first end of the shank.
- the sleeve has 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 and the at least one protrusion abuts against the limit element when removing the bit form the polygonal hole.
- a stopper is secured on one end of the shank for preventing the sleeve from removing from the shank.
- 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.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Abstract
Description
- The present invention relates to a quick-release device, and more particularly to a quick-release device for screwdriver bits.
- 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. - 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 quick-release device in accordance with the present invention comprises a shank having a first end and a second end. The shank has a polygonal hole longitudinally defined in the first end thereof and the polygonal hole is adapted for partially receiving a bit, wherein the bit has a groove annularly defined therein. At least one slot is longitudinally defined in the first end of the shank. An annular groove is defined in an inner periphery of the polygonal hole and communicates with the at least one slot, wherein the annular groove is formed with a tapered section toward the first end of the shank. An expandable limit element is received in the annular groove, wherein the limit element has an outer diameter slightly smaller than a diameter of the annular groove. A sleeve is movably sleeved on the first end of the shank. The sleeve has 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 and the at least one protrusion abuts against the limit element when removing the bit form the polygonal hole. A stopper is secured on one end of the shank for preventing the sleeve from removing from the shank.
- 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.
-
-
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 inFig. 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. - Referring to the drawings and initially to
Figs. 1-4 , a quick-release device for screwdriver bits in accordance with the present invention comprises ashank 10, asleeve 20 movably sleeved on one end of theshank 10 and astopper 30 is secured on one end of theshank 10 for preventing thesleeve 20 from removing from theshank 10. - The
shank 10 has a first end and a second end. Theshank 10 has apolygonal hole 11 longitudinally defined in the first end of theshank 10 for partially receiving abit 40, wherein thebit 40 has agroove 41 annularly defined therein. Ahollow stub 12 longitudinally extends from the first end of theshank 10 and at least oneslot 13 is longitudinally defined in thehollow stub 12. In the preferred embodiment of the present invention, thehollow stub 12 has a diameter smaller than that of theshank 10 and a diametrical difference is formed between theshank 10 and thehollow stub 12, wherein the diametrical difference is equal to a thickness of thesleeve 20. Thehollow stub 12 has twoslots 13 defined therein and the twoslots 13 diametrically correspond to each other. Anannular groove 14 is defined in an inner periphery of thepolygonal hole 11 and communicates with the at least oneslot 13. Theannular groove 14 is formed with atapered section 15 toward thehollow stub 12. Anexpandable limit element 16 is received in theannular groove 14, wherein thelimit element 16 has an outer diameter slightly smaller than a diameter of theannular groove 14. In the preferred embodiment of the present invention, thelimit element 16 is a C-ring, an O-ring and the like. Theshank 10 further includes apolygonal shaft 17 extending from the second end thereof. Thepolygonal shaft 17 is adapted to be connected to a handle (not shown) for operator to easily operate thebit 40. - The
sleeve 20 is movably sleeved on thehollow stub 12 and reciprocally moved relative to thehollow stub 12. Thesleeve 20 has at least oneprotrusion 21 inwardly extending therefrom, wherein the at least oneprotrusion 21 is engaged into the at least oneslot 13 to prevent thesleeve 20 from being rotated relative to thehollow stub 12. The at least oneprotrusion 21 abuts against thelimit element 16 when removing thebit 40 form thepolygonal hole 11. - With reference to
Figs. 1 ,5 and 6 , the bottom of thebit 40 is directly inserted into thepolygonal hole 11 when assembling thebit 40 the quick-release device in accordance with the present invention. Further with reference toFig. 9 , thelimit element 16 is expended due to the shank is thebit 40 after the bottom of thebit 40 passing through thelimit element 16. Thelimit element 16 directly engaged into agroove 41 peripherally defined in thebit 40 and the bottom of thebit 40 abuts a bottom of thepolygonal hole 11 when thelimit element 16 horizontally corresponds to thegroove 41. Consequently, the operator can easily drive a screw by using the quick-release device in accordance with the present invention when thebit 41 is inserted into and positioned in thepolygonal hole 11. Under this condition, thelimit element 16 is moved with thebit 40 when thebit 40 is reversely pulled. Thelimit element 16 is inwardly pushed to more tightly engage into thegroove 41 due to thetapered section 15 of theannular groove 14 in theshank 10 such that thebit 40 cannot be freely removing from thepolygonal hole 11 in theshank 10. - With reference to
Figs. 1 ,7 ,8 and11 , when removing thebit 40 from thepolygonal hole 11 in theshank 10, thesleeve 20 is inwardly moved relative to theshank 10 to make the at least oneprotrusion 21 engaged to thelimit element 16. Consequently, thelimit element 16 does not be moved with thebit 40 toward thetapered section 15 when thebit 40 is pulled from thepolygonal hole 11 in theshank 10 such that thebit 40 in thepolygonal hole 11 is removed from theshank 10 when thelimit element 16 is expanded due to the movingbit 40. - As described above, the quick-release device for screwdriver bits in accordance with the present invention includes the following advantages.
- 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. 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.
- Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.
Claims (8)
- 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 (15) 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; anda stopper secured on one end of the shank for preventing the sleeve from removing from the shank.
- The quick-release device for screwdriver bits as claimed in claim 1, wherein the shank includes a hollow stub longitudinally extending from the first end thereof and the at least one slot is longitudinally defined in the hollow stub, a sleeve movably sleeved on the hollow stub, the hollow stub having a diameter smaller than that of the shank and a diametrical difference being formed between the shank and the hollow stub, wherein the diametrical difference is equal to a thickness of the sleeve.
- The quick-release device for screwdriver bits as claimed in claim 1, wherein the shank 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 that is inserted into the polygonal hole.
- The quick-release device for screwdriver bits as claimed in claim 2, wherein the shank 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 that is inserted into the polygonal hole.
- The quick-release device for screwdriver bits as claimed in claim 1, wherein the limit element is selected from the group consisting of C-ring and O-ring.
- The quick-release device for screwdriver bits as claimed in claim 2, wherein the limit element is selected from the group consisting of C-ring and O-ring.
- The quick-release device for screwdriver bits as claimed in claim 3, wherein the limit element is selected from the group consisting of C-ring and O-ring.
- The quick-release device for screwdriver bits as claimed in claim 4, wherein the limit element is selected from the group consisting of C-ring and O-ring.
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 true EP3109003A1 (en) | 2016-12-28 |
EP3109003B1 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)
Country | Link |
---|---|
EP (1) | EP3109003B1 (en) |
TW (1) | TWI562865B (en) |
Families Citing this family (1)
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 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3243389A1 (en) * | 1982-11-24 | 1984-05-24 | Wera Werk Hermann Werner Gmbh & Co, 5600 Wuppertal | Chuck for tool inserts, in particular screwdriver bits |
US4535658A (en) * | 1982-03-05 | 1985-08-20 | Allen Manufacturing Company | Socket bit holder |
DE20211170U1 (en) * | 2002-07-24 | 2002-10-10 | Huang, Daniel, Dali, Taichung | Quick-action chuck for a screwdriver |
US8578823B2 (en) * | 2010-10-06 | 2013-11-12 | Simpson Strong-Tie Company Inc. | Ring lock mandrel and release mechanism |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5934384A (en) * | 1998-04-27 | 1999-08-10 | Wang; Peter | Transmission shaft and bit mounting arrangement of a motor-driven hand drill |
TWM286749U (en) * | 2005-11-01 | 2006-02-01 | Jen-Li Huang | Detent structure for driving shaft |
-
2015
- 2015-06-16 TW TW104119369A patent/TWI562865B/en active
-
2016
- 2016-04-21 EP EP16000896.7A patent/EP3109003B1/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4535658A (en) * | 1982-03-05 | 1985-08-20 | Allen Manufacturing Company | Socket bit holder |
DE3243389A1 (en) * | 1982-11-24 | 1984-05-24 | Wera Werk Hermann Werner Gmbh & Co, 5600 Wuppertal | Chuck for tool inserts, in particular screwdriver bits |
DE20211170U1 (en) * | 2002-07-24 | 2002-10-10 | Huang, Daniel, Dali, Taichung | Quick-action chuck for a screwdriver |
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 |
EP3109003B1 (en) | 2022-06-29 |
TWI562865B (en) | 2016-12-21 |
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