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
  • 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
  • B25B13/467—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle with concentric driving and driven member which are gear-operated
• • 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
• • 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
  • B25B17/00—Hand-driven gear-operated wrenches or screwdrivers

Definitions

• This invention relates to a spanner, generally a ratchet spanner.
• Spanners are used to remove nuts from bolts.
• the spanner may be provided with a ratchet mechanism which allows the nut to be removed by series of relatively short turning movements of the spanner. However, this is still a relatively slow way of removing a nut, once loosened.
• the present invention provides a spanner which comprises a handle, a head attached to one end of said handle, a rotatable member rotatable mounted in the head; reciprocatable drive means for rotating the rotatable member and reciprocation means connected to the drive means, the drive means having at one end thereof a set of assymetrical teeth adapted to engage and rotate said rotatable member during movements in one direction of said reciprocation but not in the other direction of reciprocation.
• the spanner further includes reversing means to enable the direction of rotation of the rotatable member to be reversed. This is done by diametrically changing the side of the rotatable member which is engaged by the set of teeth.
• the drive means comprises a bifurcated member, the rotatable member being insertable between the arms of the bifurcated member, the reciprocation means being operable to cause reciprocal movement of the bifurcated member substantially parallel to the axis of said arms, the inner surface of each arm having teeth to catch the rotatable member and thereby rotate the rotatable member when moved in one direction and not catch the rotatable member when moved in the other direction.
• Each set of teeth is arranged to catch the rotatable member in a respective one of the directions of reciprocating movement.
• the assymetrical teeth each have an abutment surface on one side for engaging the rotatable member, and a ramp surface on an opposed side for sliding over and not engaging the rotatable member.
• the direction of assymetry of all the teeth in a set is always the same.
• the handle is hollow and the drive means comprises a shank in the handle attached at one end to the bifurcated member.
• the reciprocation means may comprise a lever passing through a hole in the handle and pivotal on the handle, the lever being engaged with the shank so that pivotal movement of the lever causes reciprocation of the shank.
• the lever includes a bifurcated end within the handle, the arm of the bifurcated end being positioned in a circumferential groove in the shank.
• the reversing means comprise means to rotate the shank and bifurcated member through 180 degrees about the longitudinal axis thereof.
• An open- ended housing may be provided about the shank, an extension of the said housing passing through an aperture in the end of said handle so that the housing may be rotated by manually rotating the extension and connection means (for example, a spring) being provided between said shank and said housing.
• the housing has an enlarged internal bore and the shank has an enlargement on the end thereof, a spring being operative between the enlargement and a flange provided around the open entrance to the housing.
• the reciprocation means may be a conventional pneumatic or hydraulic reciprocating mechanism, such as those used in drills, chisels and hammers.
• a spanner (1) is provided with a head (2) and handle (3) .
• the head (2) comprises a ratchet mechanism and a socket for a nut, or other type of spanner according to the task to be performed.
• a rotatable member (4) is rotatably mounted in the head (2) .
• On the rotatable member (4) is mounted the ratchet mechanism (not shown) .
• the rotatable member has logit dinal ribs (20) on the part within the head.
• Drive means are provided to rotate the rotatable member and in the embodiment shown in the drawings the drive means comprise a reciprocatable bifurcated member (5) having means on inner surfaces of the arms thereof to engage the rotatable member.
• These means comprise two sets of oppositely inclined asymmetrical teeth (19) which are arranged such that forward movement of the bifurcated member (5) will cause the teeth on one arm to engage ribs (20) and rotate the rotatable member (4) , whilst backward movement in the other direction will cause the teeth on the other arm to rotate the rotatable member in the same sense.
• one set of teeth (19) at a time bear against the ribs (20) and so cause rotation, the teeth on the other side sliding over the ribs.
• the distance apart of the bifurcated arms and length of the teeth are of a suitable size to allow this to happen.
• the rotatable member becomes released by the teeth at the inner end of the bifurcated member.
• the drive means comprise a .shank (6) which may be reciprocated by operation of a lever (7) passing through an aperture (8) in the wall of the housing and pivoted therein by a pivot pin (9) .
• the lever (7) terminates in a bifurcated member (10) or alternatively there may be only one arm.
• the free end of the lever (7) engages in a circumferential groove (11) in the shank (6) .
• the lever (7) is shaped on the outer surface to provide a handle (12) which may be readily gripped in the hand along with the handle of the spanner.
• the bifurcated member (5) can be turned upside down, so that the rotatable member (4) may be rotated in the opposite direction, by turning the shank (6) through 180 .
• the shank (6) has an enlarged end (16) and a compression spring (17) is fitted between the end (16) and an inwardly directed flange (18) which defines the entrance to the housing.
• This spring causes some connection between the shank (6) and the housing (13) so that rotation of the knob (15) will rotate the housing and thereby the shank (6) and bifurcated member (5) .
• the spring (17) also returns the shank (6) to a rest position after pressing down of the handle (12) .
• peripheral elements may be associated with the construction.
• operation of the spanner can be caused to deposit a small amount of lubricating fluid onto a nut being withdrawn.
• the spanner may be used as follows: The spanner is used initially in the normal manner to loosen a nut, generally by employing the spanner ratchet mechanism, however once loose, the nut can be readily removed by operating the lever (7) so as to cause reciprocating movement of the bifurcated member (5) . This reciprocation rotates the rotatable member (4) and thereby rotates the spanner jaws and nut. The rotation is relatively rapid and thus enables a loosened nut to be withdrawn rapidly from a bolt without substantial movement of the handle of the spanner.
• a spanner which has the advantage that a nut, once free, can be readily removed from a bolt without substantial rotation of the handle part of the spanner.
• the spanner finds application in all fields of engineering where nuts must be removed from bolts.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=3760561

Family Applications (1)

Country Status (3)

Families Citing this family (3)

Family Cites Families (4)

• 1982
  • 1982-05-27 EP EP19820901574 patent/EP0110873A1/de not_active Withdrawn
  • 1982-05-27 WO PCT/AU1982/000083 patent/WO1983004207A1/en not_active Ceased
  • 1982-05-27 AU AU84582/82A patent/AU8458282A/en not_active Abandoned

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events