EP0733439A1 - Structure de support d'une broche d'enclume dans une clé à impulsion, à came - Google Patents

Structure de support d'une broche d'enclume dans une clé à impulsion, à came Download PDF

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Publication number
EP0733439A1
EP0733439A1 EP95104236A EP95104236A EP0733439A1 EP 0733439 A1 EP0733439 A1 EP 0733439A1 EP 95104236 A EP95104236 A EP 95104236A EP 95104236 A EP95104236 A EP 95104236A EP 0733439 A1 EP0733439 A1 EP 0733439A1
Authority
EP
European Patent Office
Prior art keywords
cam
anvil
hammer
anvil pin
pin
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Withdrawn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
EP95104236A
Other languages
German (de)
English (en)
Inventor
Saburo Nakajima
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP95104236A priority Critical patent/EP0733439A1/fr
Publication of EP0733439A1 publication Critical patent/EP0733439A1/fr
Withdrawn legal-status Critical Current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
    • B25B21/02—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
    • B25B21/026—Impact clutches
    • 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

Definitions

  • the present invention relates to a support structure of an anvil pin for stably supporting an anvil pin which gives impact to an anvil in a cam-type impact wrench.
  • U.S. Patent No. 4313505 (Fig. 1). This has a hammer 1 which is rotatingly driven by an air motor; an anvil pin 2 generating rotation impact force; an anvil pin 7 which is held in a concave groove 3 provided inside of the hammer 1 and which is movable in the axial direction against the force of the cam release spring 5 to the position where the impact force is to be generated against the projecting ear 4 of the anvil 2, and has a middle portion 6 having a small diameter; and a ball cam 9 which corresponds to a cam sleeve 8 which engages with the anvil pin 7 to move the anvil pin 7 in the axial direction, and further includes a ring-shaped member 11 having concave portions 10 opposite in the diametral direction engaged with an end portion of the anvil pin 7 in the hammer 1, whereby the anvil pin 7 is exactly positioned in the axial direction to apply the impact force exactly in the axial direction against the anvil 2.
  • the anvil pin 7 is guided by the concave portions 10 and concave grooves 3 provided in the hammer 1 to reciprocate in the axial direction.
  • the cam release spring 5 is extended, however, since the ring-shaped member 11 is shorter than the length of the spring, a clearance is caused between a chin portion of the anvil 2 and the ring-shaped member 11.
  • the inner diameter of the ring-shaped member 11 is larger than the outer diameter of the cam release spring 5, a clearance is also caused between them.
  • One object of the present invention is to provide a support structure of an anvil pin which can transmit rotation force coming from a rotor shaft to an anvil stably in a power impact wrench.
  • Another object of the present invention is to secure a stable reciprocating movement of the anvil pin such that the anvil pin can slide in the axial direction within the concave grooves of the hammer but cannot move in the radial direction of the hammer to the utmost, in order not to be effected even if the cam release spring is a little unstable and rattles.
  • the other object of the present invention is to provide a stable support structure of an anvil pin in an impact wrench which can generate strong impact force by making the tip of the anvil pin reach the ear-like projection smoothly without striking the chin portion of the anvil by a stable reciprocating movement.
  • Reference numeral 20 represents a hammer having a spline 21 engaged with a motor shaft. 22 represents a lumen.
  • the hammer 20 has concave grooves 23 provided in the axial direction opposing in the diametral direction. In the concave grooves 23, anvil pins 24 are fitted movably in the axial direction.
  • 25 represents an anvil shaft, and has a pair of ear-like anvils 26 provided integrally in the middle portion.
  • 27 represents splines and 28 represents a cam pilot system.
  • 29 represents a cam pilot fitted rotatably to the system 28, and 30 represents a cam ball.
  • 31 represents a hammer cam and engaged slidably with splines 27 of the anvil shaft 25.
  • the hammer cam 31 has a cam portion 32 at one end thereof and a driving portion 33 having a large diameter engaged with a circular groove 24a of the anvil pin 24 in the middle portion.
  • a concave groove 23 provided in the hammer is shown on a larger scale.
  • the concave groove 23 is a cylindrical concave groove making the point O a center, and the distance L between centers of the opposing concave grooves 23, 23 is larger than the inside diameter D of the lumen 22 of the hammer. Therefore, the structure is such that the opening width l of the concave groove 23 toward the lumen is smaller than the maximum diameter d of the anvil pin 24 (1 ⁇ d), thereby the anvil pin 24 cannot move toward inside in the radial direction.
  • 36 represents an anvil spacer.
  • the tool rotates in either normal or reverse rotational direction.
  • the state of the upper half of Fig. 4 shows the operational state, and in this state, movement in the axial direction is not applied to the hammer cam 31 and the anvil pin 24.
  • the cam ball 30 is fitted into the peripheral groove 20a (Fig. 5) provided in the hammer 20, for example over 76 degree, and the ball race 29a of the cam pilot 29, and the ball 30 is engaged with the end of the peripheral groove 20a, the end of the peripheral groove 20a for driving being a spherical surface.
  • the hammer cam 31 is driven by the rotation of the hammer 20.
  • the diameter of the end portion of the anvil pin 24 has a shape which coincides with the concave portions on the both sides of the anvil 26, whereby when the anvil pin 24 moves in the direction imparting the impact force to the anvil 26, the anvil 26 is moved in the axial direction by the hammer cam 31, while moving spirally.
  • the cam ball 30 is got on the cam portion 32. Then, the hammer cam 31 and the anvil pin 24 are again moved in the reverse direction by the cam release spring 35.
  • the anvil pin 24 moves in the axial direction, but hardly moves in the radial direction, as described above. Therefore, the anvil pin 24 operates stably without being influenced, even if the cam release spring 35 rattles a little.
  • the concave groove within the hammer in which the anvil pin is housed is so set that the distance between centers of the concave grooves is larger than the diameter D of the lumen of the hammer, and the opening width l of the concave groove toward the lumen is smaller than the diameter d of the anvil pin 24, thereby the anvil pin hardly moves in the radial direction, and moves only in the axial direction. Therefore, the anvil pin 24 operates stably to generate strong impact force without being influenced even if the cam release spring rattles a little. Furthermore, since the anvil pin moves exactly in the axial direction, it can be prevented that the anvil pin strikes the chin portion of the anvil to be damaged.
  • the life of the anvil pin is further extended to make it very economical, while wasteful time required for exchanging the anvil pin can be saved, whereby it is suitable from the view point of working efficiency.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP95104236A 1995-03-22 1995-03-22 Structure de support d'une broche d'enclume dans une clé à impulsion, à came Withdrawn EP0733439A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95104236A EP0733439A1 (fr) 1995-03-22 1995-03-22 Structure de support d'une broche d'enclume dans une clé à impulsion, à came

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95104236A EP0733439A1 (fr) 1995-03-22 1995-03-22 Structure de support d'une broche d'enclume dans une clé à impulsion, à came

Publications (1)

Publication Number Publication Date
EP0733439A1 true EP0733439A1 (fr) 1996-09-25

Family

ID=8219107

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95104236A Withdrawn EP0733439A1 (fr) 1995-03-22 1995-03-22 Structure de support d'une broche d'enclume dans une clé à impulsion, à came

Country Status (1)

Country Link
EP (1) EP0733439A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0976501A2 (fr) * 1998-07-28 2000-02-02 Rodcraft Pneumatic Tools GmbH & Co. KG Clé à choc avec mécanisme de choc débrayable
GB2423047A (en) * 2005-02-10 2006-08-16 Black & Decker Inc Hammer with rotating striker
GB2423048A (en) * 2005-02-10 2006-08-16 Black & Decker Inc Hammer with two reciprocating strikers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4313505A (en) * 1979-08-27 1982-02-02 Rodac Pneumatic Tools Rotary impact clutch
US4811797A (en) * 1987-10-21 1989-03-14 Nauchno-Proizvodstvennoe Obiedinenie Po Mekhanizirovannomu Stroitelnomu Instrumentru I Otdelochnym Mashinam Impact wrench
US5199505A (en) * 1991-04-24 1993-04-06 Shinano Pneumatic Industries, Inc. Rotary impact tool

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4313505A (en) * 1979-08-27 1982-02-02 Rodac Pneumatic Tools Rotary impact clutch
US4811797A (en) * 1987-10-21 1989-03-14 Nauchno-Proizvodstvennoe Obiedinenie Po Mekhanizirovannomu Stroitelnomu Instrumentru I Otdelochnym Mashinam Impact wrench
US5199505A (en) * 1991-04-24 1993-04-06 Shinano Pneumatic Industries, Inc. Rotary impact tool

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0976501A2 (fr) * 1998-07-28 2000-02-02 Rodcraft Pneumatic Tools GmbH & Co. KG Clé à choc avec mécanisme de choc débrayable
EP0976501A3 (fr) * 1998-07-28 2001-04-18 Rodcraft Pneumatic Tools GmbH & Co. KG Clé à choc avec mécanisme de choc débrayable
GB2423047A (en) * 2005-02-10 2006-08-16 Black & Decker Inc Hammer with rotating striker
GB2423048A (en) * 2005-02-10 2006-08-16 Black & Decker Inc Hammer with two reciprocating strikers

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Designated state(s): DE FR GB

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Effective date: 19961116

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18D Application deemed to be withdrawn

Effective date: 19980428