US3211028A - Impact wrench - Google Patents

Impact wrench Download PDF

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Publication number
US3211028A
US3211028A US324109A US32410963A US3211028A US 3211028 A US3211028 A US 3211028A US 324109 A US324109 A US 324109A US 32410963 A US32410963 A US 32410963A US 3211028 A US3211028 A US 3211028A
Authority
US
United States
Prior art keywords
arm
key
retainer
pivot shaft
nut
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.)
Expired - Lifetime
Application number
US324109A
Other languages
English (en)
Inventor
Christensson Kjell Ivar
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
Application granted granted Critical
Publication of US3211028A publication Critical patent/US3211028A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B25B21/005—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type driven by a radially acting hydraulic or pneumatic piston
    • 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
    • B25B13/00—Spanners; Wrenches
    • B25B13/46—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle
    • B25B13/461—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle with concentric driving and driven member
    • B25B13/462—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle with concentric driving and driven member the ratchet parts engaging in a direction radial to the tool operating axis
    • B25B13/463—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle with concentric driving and driven member the ratchet parts engaging in a direction radial to the tool operating axis a pawl engaging an externally toothed wheel
    • 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

  • This invention is based on the last mentioned idea and has reference to such an implement comprising a key fitting to the nut or the like and a pneumatic hammer for turning said key.
  • the main feature of the invention is to be seen therein that a retainer is journalled about a shaft extending through an arm on said key, the head of said pneumatic hammer being attached to said hammer in such a way that during operation of the same its beater will beat against one border of said arm, said border being shaped substantially as the arc of a circle.
  • the key and the hammer may comprise a common rivet hammer, form a unit and after the tightening of a nut it is only necessary to swing the hammer about said shaft half a revolution for the untightening of the nut.
  • the key arm may during the tightening of the nut turn relatively to the retainer with the hammer.
  • the tightening can hereby be carried out in spaces hard to reach.
  • the longitudinal direction of the hammer may be adjusted to enclose acute or obtuse angles with the longitudinal direction of the key arm. The degree of tightening may always be easily controlled.
  • the retainer at which the pneumatic hammer is attached is bifurcated and extends with its two branches on both sides of the key arm.
  • the implement is hereby rendered very strong and it can withstand considerable stresses.
  • the retainer branches are provided with each their axial bore with a piston movable therein in the longitudinal direction of said bore against the action of a spring.
  • the shaft extending through said key arm is carried at its two ends by the two pistons. Due to this buffering device the implement will operate very smoothly at the beginning of the tightening of the nut when there does not occur any nota-ble resistance, as Well as at the end of the tightening when the resistance is very high.
  • the beater of the implement may, when it has acted on one of the beat borders, be brought to act on the other border when the retainer with the hammer has been swung half a revolution relative to the key arm for turning the nut in the opposite direction.
  • FIG. 1 is a plan view of an implement according to the invention
  • FIG. 2 shows a longitudinal section through the retainer of the implement on the line II-II in FIG. 1,
  • FIG. 3 shows a cross section on the line III-III in FIG. 1,
  • FIG. 4 shows a cross section on the line IV-IV in FIG. 1, and
  • FIG. 5 is a side elevation of the retainer.
  • the key 1 shown in FIG. 1 comprises a so-called ring beater key from which an arm 2 extends radially.
  • the arm 2 is provided with essentially arc-shaped beat borders 3 and 4 with the centre situated in the centre portion of said arm 2. This centre portion is passed through by a shaft 5 on which there is journalled a retainer 6 for a pneumatic rivet hammer 7.
  • the retainer 6 comprises two plates 9 kept against each other by means of expansion bolts 8.
  • the retainer 6 extends at one end with two branches on either side of the key arm 2. Atthe opposite side the plates 9 embrace the head 11 on the rivet hammer 7 so that this is steadily kept on the retainer 6.
  • the rammer means 12 of the hammer 7 is axially movable in a longitudinal notch 13 in the retainer 6 and abuts against one of the beat borders 3 and 4 on the key arm 2 depending upon the position the ham mer 7 takes relative to the key 1.
  • the shaft 5 engages with its two ends longitudinal bores 14 in the branches 10 said bores at the outer ends closed by means of screw plugs 15. Due to this arrangement the key 1 with the arm 2 may, when the beater 12, in the position of the hammer 7 shown in FIG. 1, hits the beat border 4 of the arm, be turned in counter-clockwise direction according to FIG. 1 simultaneously as the shaft 5 is moved in the bores 14 in the direction towards the plugs 15.
  • the present invention has been described in detail above for purposes of illustration only and is not intended to be limited by this description or otherwise except as defined in the appended claims.
  • the riveting hammer 7, the retainer 6 and the key 1 may be modified in many ways without departure from the scope of the invention.
  • the retainer 6 may comprise one single bifurcated piece.
  • An implement for tightening and loosening nuts and the like comprising a key adapted to fit the nut or the like to be tightened or loosened, an arm projecting laterally from said key, a pivot shaft carried by said arm perpendicular thereto and offset from said key, said arm having two opposite convex arcuate borders approximately concentric with said pivot shaft, a retainer pivotally connected to said arm by said pivot shaft and swingable about said pivot shaft relative to said arm, a pneumatic hammer secured to said retainer and having a reciprocable rammer, said retainer being swingable about said pivot shaft between a first position in which said rammer is engageable with one of said convex arcuate borders to tighten said nut or the like and a second position in which said rammer is engageable with the other of said convex arcuate borders to loosen said nut or the like.
  • An implement for tightening nuts and the like comprising a key adapted to fit the nut or the like to be tightened, an arm projecting laterally from said key, a pivot shaft carried by said arm perpendicular thereto and offset from said key, said arm having a convex arcuate border approximately concentric with said pivot shaft, a retainer pivotally connected to said arm by said pivot shaft and swingable about said pivot shaft relative to said arm, said retainer being bifurcated with portions embracing opposite sides of said arm and said pivot shaft extending through said arm and into said opposite portions of said bifurcated retainer, a pneumatic hammer secured to said retainer and having a rammer engageable with said convex arcuate border of said arm in a direction approximately perpendicular to said line, each of said References Cited by the Examiner UNITED STATES PATENTS D. 105,338 7/37 McNaught.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
US324109A 1962-11-23 1963-11-15 Impact wrench Expired - Lifetime US3211028A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1258462 1962-11-23

Publications (1)

Publication Number Publication Date
US3211028A true US3211028A (en) 1965-10-12

Family

ID=20295988

Family Applications (1)

Application Number Title Priority Date Filing Date
US324109A Expired - Lifetime US3211028A (en) 1962-11-23 1963-11-15 Impact wrench

Country Status (6)

Country Link
US (1) US3211028A (de)
AT (1) AT240301B (de)
CH (1) CH421860A (de)
DE (1) DE1478846A1 (de)
DK (1) DK109190C (de)
GB (1) GB984953A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3675515A (en) * 1970-09-30 1972-07-11 Creative Tool High energy impact wrench assembly
US4137800A (en) * 1976-08-23 1979-02-06 Harmat Nominees Pty. Ltd. Torque wrench
US20020175579A1 (en) * 2001-07-23 2002-11-28 Brian Cuerden Impact micro-positioning actuator

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB450778A (en) * 1934-03-06 1936-07-24 Mueller Friedrich Improvements in means for connecting and disconnecting screwed joints
US2112693A (en) * 1937-06-16 1938-03-29 Independent Pneumatic Tool Co Portable hammer wrench
US2119968A (en) * 1935-03-15 1938-06-07 William H Keller Inc Power wrench

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB450778A (en) * 1934-03-06 1936-07-24 Mueller Friedrich Improvements in means for connecting and disconnecting screwed joints
US2119968A (en) * 1935-03-15 1938-06-07 William H Keller Inc Power wrench
US2112693A (en) * 1937-06-16 1938-03-29 Independent Pneumatic Tool Co Portable hammer wrench

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3675515A (en) * 1970-09-30 1972-07-11 Creative Tool High energy impact wrench assembly
US4137800A (en) * 1976-08-23 1979-02-06 Harmat Nominees Pty. Ltd. Torque wrench
US20020175579A1 (en) * 2001-07-23 2002-11-28 Brian Cuerden Impact micro-positioning actuator
US6983667B2 (en) * 2001-07-23 2006-01-10 University Of Arizona Impact micro-positioning actuator

Also Published As

Publication number Publication date
CH421860A (de) 1966-09-30
DK109190C (da) 1968-03-25
AT240301B (de) 1965-05-25
DE1478846A1 (de) 1969-02-06
GB984953A (en) 1965-03-03

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