EP2711133A1 - Werkzeugmaschine - Google Patents

Werkzeugmaschine Download PDF

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Publication number
EP2711133A1
EP2711133A1 EP12185318.8A EP12185318A EP2711133A1 EP 2711133 A1 EP2711133 A1 EP 2711133A1 EP 12185318 A EP12185318 A EP 12185318A EP 2711133 A1 EP2711133 A1 EP 2711133A1
Authority
EP
European Patent Office
Prior art keywords
gear rack
push rod
case
gear
disposed
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.)
Withdrawn
Application number
EP12185318.8A
Other languages
English (en)
French (fr)
Inventor
Su San-Yih
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.)
Basso Industry Corp
Original Assignee
Basso Industry Corp
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 Basso Industry Corp filed Critical Basso Industry Corp
Priority to EP12185318.8A priority Critical patent/EP2711133A1/de
Publication of EP2711133A1 publication Critical patent/EP2711133A1/de
Withdrawn legal-status Critical Current

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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
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/004—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type

Definitions

  • This invention relates to a light and portable power tool. More particularly, this invention relates to a ratchet wrench power tool.
  • Hand-held tools which are operated using gas power, electric power or another type of power, are necessarily light and portable. As to different types of operation, linear displacement and rotational operation are two common ways in which hand-held tools operate.
  • a hand-held power tool utilizing a rotational type of operation is often used for fastening workpieces such as screws and nuts, and is also frequently used for drilling.
  • the power tool has must be able to switch between forward and reverse rotation.
  • the switching means for executing the function of switching between forward and reverse rotation is at a distance from the operator's hand.
  • U.S. Pat. No. 5,535,646 and U.S. Pat. No. 6,640,669 involve configurations that attempt to shift the switching means for executing the function of switching between forward and reverse rotation toward the operator's hand.
  • U.S. Pat. No. 5,535,646 as a result of the inner structural positioning used therein, the switching means is not shifted to a sufficient enough degree toward the operator's hand.
  • U.S. Pat. No. 6,640,669 a more complex and a larger tool results due to the configuration used therein.
  • An aspect of the present disclosure is to provide a reciprocal switching structure of a ratchet wrench which uses a push rod adjacent to a gripping part of the ratchet wrench to push one of two gear racks away from a gear assembly such that the gear assembly is engaged with only one gear rack at a time, thereby controlling the rotation direction of the gear assembly.
  • a reciprocal switching structure of a ratchet wrench includes a case, a gear assembly, two gear racks, a reciprocal switching mechanism and a transmission mechanism.
  • the case has a first end and a second end, and the second end is adjacent to a gripping part of the ratchet wrench and is opposite to the first end.
  • the gear assembly is pivotally disposed in the case.
  • the two gear racks are engaged or disengaged from the gear assembly reciprocally.
  • the reciprocal switching mechanism is disposed in the case, and comprises two push rods and at least one reciprocal switching member.
  • the two push rods are disposed in the case, wherein the two push rods are alternately displaced along a direction extending from the first end to the second end, in order to displace one of the two gear racks to be engaged or disengaged from the gear assembly.
  • the at least one reciprocal switching member is connected between the two push rods for driving one push rod to push against one gear rack for disengaging the gear assembly and the gear rack, thereby driving the other gear rack to be engaged with the gear assembly.
  • the transmission unit pivotally is disposed in the case, wherein the transmission unit is pivotally connected between the two gear racks for driving the two gear racks to be displaced.
  • a power tool includes a case, a ratchet, a first gear rack, a second gear rack, an elastic member, a reciprocal switching mechanism and a transmission unit.
  • the ratchet is pivotally disposed in the case.
  • the first gear rack is disposed movably in the case, wherein the first gear is engaged or disengaged from the ratchet.
  • the second gear rack is disposed movably in the case, wherein the second gear rack is disposed opposing the first gear rack and is engaged or disengaged from the ratchet in an alternating manner with the first gear rack.
  • the elastic member is connected between the first gear rack and the second gear rack, and provides a biasing force to the first gear rack and the second gear rack in a direction toward the ratchet.
  • the reciprocal switching mechanism comprises a first push rod and a second push rod.
  • the first push rod is linearly and displaceably disposed in the case for pushing the first gear rack away from the ratchet, wherein the first push rod comprises a first sliding block locating at an end thereof, and the first sliding block is exposed outside of the case to allow for user manipulation of the first sliding block.
  • the second push rod is linearly and displaceably disposed in the case for pushing the second gear rack away from the ratchet, wherein the second push rod comprises a second sliding block located at an end thereof, and the second sliding block is exposed outside of the case to allow for user manipulation of the second push rod.
  • the transmission unit is pivotally disposed in the case, wherein the transmission unit is connected between the first gear rack and the second gear rack for driving the first gear rack and the second gear rack to be displaced reciprocally.
  • a power tool includes a case, a ratchet, a first gear rack, a second gear rack, two elastic members, a reciprocal switching mechanism and a transmission unit.
  • the ratchet is pivotally disposed in the case.
  • the first gear rack is disposed movably in the case, wherein the first gear is engaged or disengaged from the ratchet.
  • the second gear rack is disposed movably in the case, wherein the second gear rack is disposed opposing the first gear rack and is engaged or disengaged from the ratchet in an alternating manner with the first gear rack.
  • One of the two elastic members is connected between the first gear rack and the first push rod, and the other elastic member is connected between the second gear rack and the second push rod.
  • the reciprocal switching mechanism comprises a first push rod and a second push rod.
  • the first push rod is linearly and displaceably disposed in the case and is abutted against the first gear rack, wherein the first push rod comprises a first sliding block locating at an end thereof, and the first sliding block is exposed outside of the case to allow for user manipulation of the first sliding block.
  • the second push rod is linearly and displaceably disposed in the case and is abutted against the second gear rack, wherein the second push rod comprises a second sliding block located at an end thereof, and the second sliding block is exposed outside of the case to allow for user manipulation of the second push rod.
  • the transmission unit is pivotally disposed in the case, wherein the transmission unit is connected between the first gear rack and the second gear rack for driving the first gear rack and the second gear rack to be displaced reciprocally.
  • FIG. 1 is a schematic view showing an internal structure of a power tool according to an embodiment of the present disclosure.
  • the power tool includes a case 100, a gear assembly 200, a first gear rack 230, a second gear rack 240, an elastic member 400, a reciprocal switching mechanism 500 and a transmission unit 600.
  • the gear assembly 200 comprises a transmission gear 220 and a ratchet 210, and the ratchet 210 and the transmission gear 220 are engaged. Both of the transmission gear 220 and the ratchet 210 are pivotally disposed in the case 100, and the first gear rack 230 is disposed opposing the second gear rack 240.
  • the reciprocal switching mechanism 500 includes a first push rod 510 and a second push rod 520.
  • the first and second gear racks 230, 240 are disposed movably in the case 100.
  • the first gear rack 230 is engaged with the ratchet 210 when the second gear rack 240 is disengaged from the ratchet 210 and vice versa.
  • the elastic member 400 is connected between the first and second gear racks 230, 240, and provides a biasing force to the first gear rack 230 and the second gear rack 240 in a direction toward the ratchet 210.
  • the first push rod 510 and the second push rod 520 can be linearly and displaceably disposed in the case 100.
  • the first push rod 510 and the second push rod 520 respectively push against the first gear rack 230 and the second gear rack 240 to displace the same in a direction away from the ratchet 210.
  • the transmission unit 600 is pivotally disposed in the case 100.
  • the transmission unit 600 is connected to the first gear rack 230 and the second gear rack 240, so that the first gear rack 230 and the second gear rack 240 can be displaced in opposite directions. That is, the transmission unit 600 is pivotally connected between the first gear rack 230 and the second gear rack 240, and is provided for driving the first gear rack 230 and the second gear rack 240 to be displaced in a reciprocal manner.
  • a sides of the first gear rack 230 facing the second gear rack 240 and a side of the second gear rack 240 facing the first gear rack 230 are referred to as inner sides.
  • a first flange 231 and a first guiding groove 232 can be included in the inner side of the first gear rack 230.
  • a second flange 241 and a second guiding groove 242 can be included in the inner side of the second gear rack 240.
  • a first guiding portion 511 is disposed at one end of the first push rod 510, and the first guiding portion 511 is alternately displaced along the first flange 231 and the first guiding groove 232 for displacing the first gear rack 230.
  • a second guiding portion 521 is disposed at one end of the second push rod 520, and the second guiding portion 521 is alternately displaced along the second flange 241 and the second guiding groove 242 for displacing the second gear rack 240.
  • the case 100 can have a first rail 110 and a second rail 120 (see FIG. 6 ).
  • a first sliding block 330 is disposed at the other end of the first push rod 510, and a second sliding block 340 is disposed at the other end of the second push rod 520.
  • the first sliding block 330 is exposed outside of the first rail 110 to allow users to operate the first sliding block 330.
  • the second sliding block 340 is exposed outside of the second rail 120 to allow users to operate the second sliding block 340. Therefore, the sliding blocks 330, 340 provided for user manipulation using a hand can be more close to the user's thumb.
  • the power tool further comprises a reciprocal switching member 530.
  • the reciprocal switching member 530 is pivotally disposed in the case 100 and is connected between the first push rod 510 and the second push rod 520.
  • One end of the reciprocal switching member 530 is pivotally connected to the first push rod 510, and the other end of the reciprocal switching member 530 is pivotally connected to the second push rod 520.
  • the reciprocal switching member 530 operates such that the first push rod 510 and the second push rod 520 can be linearly displaced in opposite directions.
  • FIG. 2 is a schematic view of the power tool of FIG. 1 , illustrating the second gear rack 240 pushing and rotating the ratchet 210.
  • the elastic member 400 provides a biasing force to the first gear rack 230 and the second gear rack 240 in a direction toward the ratchet 210.
  • the first guiding portion 511 pushes against the first flange 231 of the first gear rack 230 so as to push the first gear rack 230 away from the ratchet 210.
  • the elastic member 400 provides a biasing force to the second gear rack 240 in a direction toward the ratchet 210, only the second gear rack 240 is engaged with the ratchet 210.
  • the transmission unit 600 drives the second gear rack 240 to displace along a tangent direction of the ratchet 210 for rotating the ratchet 210. While the second gear rack 240 is returned, the second gear rack 240 is disengaged from the ratchet 210 and so returns by itself (without rotating the ratchet 210). Therefore, during the returning movement of the second gear rack 240, the ratchet 210 will be rotated only in one rotational direction. As described above, the elastic member 400 is elastically connected between the first gear rack 230 and the second gear rack 240 so that the first gear rack 230 and the second gear rack 240 can be pulled toward the ratchet 210.
  • the elastic members 400 can be two and can be respectively connected between the push rods 510/520 and the gear racks 230/240 for allowing the push rods 510/520 to be abutted against the gear racks 230/240 ( Fig. 2' ). Furthermore, in some embodiments, the elastic member 400 may push against the outer sides of the first gear rack 230 and the second gear rack 240 so as to bias the first gear rack 230 and the second gear rack 240 in a direction toward the ratchet 210.
  • the elastic member 400 pulling against the first gear rack 230 and the second gear rack 240 is used as an example in the embodiment herein.
  • FIG. 3 is a schematic view of the power tool of FIG. 1 , illustrating the first gear rack 230 engaged with the ratchet 210 and the second gear rack disengaged from the ratchet 210.
  • the first sliding block 330 When the first sliding block 330 is pushed by a user, the first guiding portion 511 is displaced from the first flange 231 to the first guiding groove 232 of the first gear rack 230.
  • the elastic member 400 pulls the first gear rack 230 toward the ratchet 210 so that the first gear rack 230 engages with the ratchet 210.
  • the first sliding block 330 operates the reciprocal switching member 530 so that the second sliding block 340 is displaced, and the second guiding portion 521 is displaced from the second guiding groove 242 to the second flange 241 of the second gear rack 240, thereby pushing the second gear rack 240 away from the ratchet 210.
  • FIG. 4 is a schematic view of the power tool of FIG. 1 , illustrating the first gear rack 230 pushing and rotating the ratchet 210.
  • the transmission unit 600 drives the first gear rack 230 to be alternately displaced. During displacement, the ratchet 210 is pushed and rotated in another rotational direction while the first gear rack 230 displaces along the tangent direction of the ratchet 210.
  • the user may select one of the push rods 510 or 520 to make one of the gear racks 230 or 240 move away from the ratchet 210 so that the ratchet 210 is pushed and rotated only by one of the gear racks 230 or 240, thereby controlling the rotational direction of the ratchet 210.
  • the other sliding block 340 will be displaced by the reciprocal switching member 530, thereby changing the positions of the two push rods 510, 520 simultaneously.
  • the user can push and move one of the sliding blocks 330 or 340 merely by using his or her thumb, thereby changing the rotational direction of the ratchet 210.
  • FIG. 5 is a schematic cross-sectional view taken along line 5-5 of FIG. 1 .
  • the ratchet 210 further includes at least one blind hole 211, at least one spring 212 and at least one steel ball 213.
  • the spring 212 and the steel ball 213 are received in the blind hole 211, such that the spring 212 pushes against and displaces the steel ball 213 outwards from the blind hole 211.
  • the steel ball 213 will be pushed by the spring 212 to abut against the case 100, thereby increasing the resistance between the ratchet 210 and the case 100.
  • the gear racks 230, 240 undergo a returning movement, the gear racks 230, 240 will not force the ratchet 210 to rotate backwards.
  • FIG. 6 is a schematic view of the power tool of FIG. 1 , illustrating the reciprocal switching member 530 pivotally disposed in the case 100
  • FIG. 7 is a cross-sectional view of the reciprocal switching member 530 taken along line 7-7 of FIG. 6
  • the case 100 includes the first rail 110 and the second rail 120 disposed thereon, as described above.
  • the first rail 110 is provided for allowing the first push rod 510 to slide thereon
  • the second rail 120 is provided for allowing the second push rod 520 to slide thereon.
  • One of the two ends of the reciprocal switching member 530 is pivotally connected to the first push rod 510, and the other end of the reciprocal switching member 530 is pivotally connected to the second push rod 520, thereby displacing the first push rod 510 and the second push rod 520 in opposite directions when the reciprocal switching member 530 is operated.
  • a bottom surface of the reciprocal switching member 530 includes a first indentation 531 and a second indentation 532.
  • the case 100 includes a recess 132 located between the first push rod 510 and the second push rod 520, and a compression spring 130 is vertically disposed in the recess 132. Moreover, a bead 131 is disposed on the compression spring 130 exposing outwards from the recess 132.
  • the compression spring 130 abuts against and displaces the bead 131 outward from the recess 132, and then the bead 131 abuts against one of the two indentations 531, 532 so as position the reciprocal switching member 530 while the first rod 510 and the second rod 520 reciprocally displace.
  • the transmission unit 600 includes a swinging member 610 and an eccentrically rotating member 620.
  • the swinging member 610 is pivotally disposed in the case 100.
  • the swinging member 610 is connected to the first gear rack 230 and the second gear rack 240.
  • the first gear rack 230 and the second gear rack 240 are pivotally disposed at the swinging member 610, and are respectively located at both sides of the eccentrically rotating member 620.
  • the swinging member 610 can be driven to swing reciprocally and can simultaneously bring the first gear rack 230 and the second gear rack 240 to be displaced reciprocally, in which the power source for driving the eccentrically rotating member 620 is conventional and so is not described herein.
  • the aforementioned ratchet 210 driven to be rotated can be used as an output power.
  • a socket (not shown) can be mounted on the ratchet 210 to release or fasten a nut (not shown).
  • a socket driven and rotated by the ratchet 210 can achieve the same function.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
EP12185318.8A 2012-09-20 2012-09-20 Werkzeugmaschine Withdrawn EP2711133A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12185318.8A EP2711133A1 (de) 2012-09-20 2012-09-20 Werkzeugmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12185318.8A EP2711133A1 (de) 2012-09-20 2012-09-20 Werkzeugmaschine

Publications (1)

Publication Number Publication Date
EP2711133A1 true EP2711133A1 (de) 2014-03-26

Family

ID=46970051

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12185318.8A Withdrawn EP2711133A1 (de) 2012-09-20 2012-09-20 Werkzeugmaschine

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EP (1) EP2711133A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11981017B2 (en) 2021-05-05 2024-05-14 Snap-On Incorporated Ratchet with toggle trigger

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5535646A (en) 1995-02-07 1996-07-16 Stanley Mechanics Tools, Inc. Ratchet drive
US20030150298A1 (en) * 2000-12-06 2003-08-14 S.P. Air Kabusiki Kaisha Hand-held power tool
US6640669B2 (en) 2001-12-20 2003-11-04 Kabushiki Kaisha Shinano Seisakusho Ratchet wrench
US20080142329A1 (en) * 2006-12-15 2008-06-19 Sp Air Kabushiki Kaisha Ratchet Drive for a Ratchet Wrench

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5535646A (en) 1995-02-07 1996-07-16 Stanley Mechanics Tools, Inc. Ratchet drive
US20030150298A1 (en) * 2000-12-06 2003-08-14 S.P. Air Kabusiki Kaisha Hand-held power tool
US6640669B2 (en) 2001-12-20 2003-11-04 Kabushiki Kaisha Shinano Seisakusho Ratchet wrench
US20080142329A1 (en) * 2006-12-15 2008-06-19 Sp Air Kabushiki Kaisha Ratchet Drive for a Ratchet Wrench

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11981017B2 (en) 2021-05-05 2024-05-14 Snap-On Incorporated Ratchet with toggle trigger

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