GB2612490A - Impact mechanism for rotary tool - Google Patents
Impact mechanism for rotary tool Download PDFInfo
- Publication number
- GB2612490A GB2612490A GB2301160.4A GB202301160A GB2612490A GB 2612490 A GB2612490 A GB 2612490A GB 202301160 A GB202301160 A GB 202301160A GB 2612490 A GB2612490 A GB 2612490A
- Authority
- GB
- United Kingdom
- Prior art keywords
- anvil
- hammer
- longitudinal axis
- lobes
- face
- 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
- 238000006073 displacement reaction Methods 0.000 claims 3
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
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
- B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H33/00—Gearings based on repeated accumulation and delivery of energy
- F16H33/02—Rotary transmissions with mechanical accumulators, e.g. weights, springs, intermittently-connected flywheels
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
An impact mechanism for use with a drive motor comprises a drive shaft and operatively carries a hammer member having first, second and third hammer lobes and an anvil member having first, second and third anvil lobes. A spring is interconnected between the drive shaft and the hammer member for temporarily storing energy from the relative rotation of the drive shaft with respect to the hammer member. A tool retainer is connected in torque transmitting relation to the anvil member. As the hammer member is rotated, the hammer member and the anvil member go through consecutive impact cycles wherein the hammer lobes are forcefully rotated past the engaged anvil lobes, and subsequently to forcefully impact the rotationally next ones of the anvil lobes, to thereby create the corresponding impact torque for the anvil member about the longitudinal axis.
Claims (16)
1. An impact mechanism for use with a drive motor, the impact mechanism comprising: a drive shaft defining a longitudinal axis, and operatively carrying a hammer member for rotational movement about the longitudinal axis and longitudinal movement between a forward position and a rearward position that define a longitudinal clearing displacement therebetween, and operatively carrying an anvil member for rotational movement about the longitudinal axis; wherein the hammer member has first, second and third hammer lobes spaced radially around the longitudinal axis, and the anvil member has first, second and third anvil lobes spaced radially around the longitudinal axis, to define an overall travel arc between impact faces of adjacent anvil lobes; a spring operatively interconnected between the drive shaft and the hammer member for temporarily storing energy from the relative rotation of the drive shaft with respect to the hammer member and subsequently releasing stored energy to forcibly rotate the hammer member about the longitudinal axis with respect to the anvil member; a tool retainer connected in torque transmitting relation to the anvil member for rotation therewith; wherein, as the hammer member is rotated by the spring and the drive shaft with respect to the anvil member, the hammer member and the anvil member go through consecutive impact cycles wherein the hammer lobes are initially in lateral engagement with the anvil lobes, the hammer lobes move rearwardly with respect the longitudinal axis through said longitudinal clearing displacement to be longitudinally positioned to subsequently permit the spring to forcefully rotate the hammer past the engaged anvil lobes, and subsequently to forcefully impact the rotationally next ones of the anvil lobes, to thereby create said corresponding impact torque for the anvil member about the longitudinal axis.
2. The impact mechanism of Claim 1, wherein the ratio of said overall travel arc to said longitudinal clearing displacement is less than about 4:1.
3. The impact mechanism of Claim 1, wherein the ratio of the arcuate distance of the base of the hammer member about the longitudinal axis to the arcuate distance of the tip of the hammer member about the longitudinal axis is between about 2:1 and 4:1.
4. The impact mechanism of Claim 1, wherein the ratio of the arcuate distance of the base of the anvil member about the longitudinal axis to the arcuate distance of the tip of the anvil member about the longitudinal axis is between about 2:1 and 4:1.
5. The impact mechanism of Claim 4, wherein each of the anvil lobes has a first face and a second face and each, and wherein the arcuate distance of the tip of the anvil member about the longitudinal axis to the arcuate distance between the first face of one anvil lobe and the second face of the adjacent anvil lobe is between about 5:1 and 15:1.
6. The impact mechanism of Claim 1, wherein the hammer member additionally comprises a fourth hammer lobe, and wherein the first, second, third and fourth hammer lobes are spaced equally radially around the longitudinal axis, and the anvil member additionally comprises a fourth anvil lobe, and wherein the first, second, third and fourth anvil lobes are spaced equally radially around the longitudinal axis, to define an overall travel arc, and wherein the first, second, third and fourth hammer lobes each impact the first, second, third and fourth anvil lobes as the hammer member is rotated by the drive shaft with respect to the anvil member, to thereby create corresponding impact torque for the anvil member about the longitudinal axis.
7. The impact mechanism of Claim 1, wherein each of the hammer lobes has a first face and a second face and each of the anvil lobes has a first face and a second face, and wherein in use, when the hammer member is rotated in a first rotational direction about the longitudinal axis with respect to the anvil member, the first face of each hammer lobe contacts the second face of a corresponding anvil lobe, and when the hammer member is rotated in a second rotational direction about the longitudinal axis with respect to the anvil member, the second face of each hammer lobe contacts the first face of a corresponding anvil lobe.
8. The impact mechanism of Claim 7, wherein the ratio of the arc of free travel of the hammer member about the longitudinal axis when the second face of each hammer lobes rotationally passes the first face of the anvil lobes to the next impact with the anvil lobes whereat the first face of each hammer lobe impacts the second face of each envelope, to the arc of travel of the hammer member about the longitudinal axis with respect to the anvil member between consecutive impacts is less than about 3:4.
9. The impact mechanism of Claim 8, wherein the ratio of the arc of free travel of the hammer member about the longitudinal axis when the second face of each hammer lobes rotationally passes the first face of the anvil lobes to the next impact with the anvil lobes whereat the first face of each hammer lobe impacts the second face of each envelope, to the arc of travel of the hammer member about the longitudinal axis with respect to the anvil member between consecutive impacts is less than about 2:3.
10. The impact mechanism of Claim 1, wherein the ratio of the arcuate distance of the base of the hammer member about the longitudinal axis to the arcuate distance of the tip of the hammer member about the longitudinal axis is between about 2:1 and 4:1.
11. The impact mechanism of Claim 1, wherein the ratio of the arcuate distance of the base of the anvil member about the longitudinal axis to the arcuate distance of the tip of the anvil member about the longitudinal axis is between about 2:1 and 4:1.
12. The impact mechanism of Claim 11, wherein each of the anvil lobes has a first face and a second face and each, and wherein the arcuate distance of the tip of the anvil member about the longitudinal axis to the arcuate distance between the first face of one anvil lobe and the second face of the adjacent anvil lobe is between about 5:1 and 15:1.
13. The impact mechanism of Claim 1, wherein the first, second and third hammer lobes are spaced equally radially around the longitudinal axis, and the first, second and third anvil lobes are spaced equally radially around the longitudinal axis.
14. The impact mechanism of Claim 1, wherein the spring is operatively interconnected between the drive shaft and the hammer member for biasing the hammer member to the forward longitudinal position.
15. The impact mechanism of Claim 1, wherein the first faces and the second faces of the anvil lobes are oriented so as to be skew with respect to said longitudinal axis.
16. The impact mechanism of Claim 1, wherein the first faces and the second faces of the hammer lobes are oriented so as to be skew with respect to said longitudinal axis.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CA2020/050901 WO2022000067A1 (en) | 2020-06-29 | 2020-06-29 | Impact mechanism for rotary tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB202301160D0 GB202301160D0 (en) | 2023-03-15 |
| GB2612490A true GB2612490A (en) | 2023-05-03 |
Family
ID=79317546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2301160.4A Pending GB2612490A (en) | 2020-06-29 | 2020-06-29 | Impact mechanism for rotary tool |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4171881A4 (en) |
| GB (1) | GB2612490A (en) |
| WO (1) | WO2022000067A1 (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3001428A (en) * | 1960-02-23 | 1961-09-26 | Master Power Corp | Rotary impact wrench |
| JPH01170570A (en) * | 1987-12-25 | 1989-07-05 | Nippon Steel Corp | Production of oxide dispersing type steel pipe having excellent high temperature strength |
| US5908076A (en) * | 1997-01-10 | 1999-06-01 | Power Tool Holders Incorporated | Impact tool driver |
| US7588093B2 (en) * | 2007-09-05 | 2009-09-15 | Grand Gerard M | Impact mechanism |
| US20140020921A1 (en) * | 2010-10-28 | 2014-01-23 | Chuan Cheong Yew | Mechanical impact mechanism for a handheld power tool |
| US9272400B2 (en) * | 2012-12-12 | 2016-03-01 | Ingersoll-Rand Company | Torque-limited impact tool |
| US20170259412A1 (en) * | 2014-07-31 | 2017-09-14 | Hitachi Koki Co., Ltd. | Impact tool |
| US20180117745A1 (en) * | 2015-01-30 | 2018-05-03 | Hitachi Koki Co., Ltd. | Impact tool |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01170570U (en) * | 1988-05-20 | 1989-12-01 | ||
| JP6638522B2 (en) * | 2015-08-07 | 2020-01-29 | 工機ホールディングス株式会社 | Electric tool |
-
2020
- 2020-06-29 EP EP20943423.2A patent/EP4171881A4/en active Pending
- 2020-06-29 WO PCT/CA2020/050901 patent/WO2022000067A1/en unknown
- 2020-06-29 GB GB2301160.4A patent/GB2612490A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3001428A (en) * | 1960-02-23 | 1961-09-26 | Master Power Corp | Rotary impact wrench |
| JPH01170570A (en) * | 1987-12-25 | 1989-07-05 | Nippon Steel Corp | Production of oxide dispersing type steel pipe having excellent high temperature strength |
| US5908076A (en) * | 1997-01-10 | 1999-06-01 | Power Tool Holders Incorporated | Impact tool driver |
| US7588093B2 (en) * | 2007-09-05 | 2009-09-15 | Grand Gerard M | Impact mechanism |
| US20140020921A1 (en) * | 2010-10-28 | 2014-01-23 | Chuan Cheong Yew | Mechanical impact mechanism for a handheld power tool |
| US9272400B2 (en) * | 2012-12-12 | 2016-03-01 | Ingersoll-Rand Company | Torque-limited impact tool |
| US20170259412A1 (en) * | 2014-07-31 | 2017-09-14 | Hitachi Koki Co., Ltd. | Impact tool |
| US20180117745A1 (en) * | 2015-01-30 | 2018-05-03 | Hitachi Koki Co., Ltd. | Impact tool |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022000067A1 (en) | 2022-01-06 |
| EP4171881A4 (en) | 2024-07-03 |
| EP4171881A1 (en) | 2023-05-03 |
| GB202301160D0 (en) | 2023-03-15 |
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