EP2532484B1 - Handle assembly for power tool - Google Patents

Handle assembly for power tool Download PDF

Info

Publication number
EP2532484B1
EP2532484B1 EP12168921.0A EP12168921A EP2532484B1 EP 2532484 B1 EP2532484 B1 EP 2532484B1 EP 12168921 A EP12168921 A EP 12168921A EP 2532484 B1 EP2532484 B1 EP 2532484B1
Authority
EP
European Patent Office
Prior art keywords
handle
support member
resilient
relative
mounting portion
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.)
Active
Application number
EP12168921.0A
Other languages
German (de)
French (fr)
Other versions
EP2532484A3 (en
EP2532484A2 (en
Inventor
Uwe Nemetz
Andreas Friedrich
Frantisek Harcar
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.)
Black and Decker Inc
Original Assignee
Black and Decker Inc
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
Priority claimed from GB201109492A external-priority patent/GB201109492D0/en
Priority claimed from GB201113116A external-priority patent/GB201113116D0/en
Application filed by Black and Decker Inc filed Critical Black and Decker Inc
Publication of EP2532484A2 publication Critical patent/EP2532484A2/en
Publication of EP2532484A3 publication Critical patent/EP2532484A3/en
Application granted granted Critical
Publication of EP2532484B1 publication Critical patent/EP2532484B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/04—Handles; Handle mountings
    • B25D17/043—Handles resiliently mounted relative to the hammer housing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/006—Vibration damping means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • B25F5/025—Construction of casings, bodies or handles with torque reaction bars for rotary tools
    • B25F5/026—Construction of casings, bodies or handles with torque reaction bars for rotary tools in the form of an auxiliary handle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • B25D2222/57—Elastomers, e.g. rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/371—Use of springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/371—Use of springs
    • B25D2250/381—Leaf springs

Definitions

  • the present invention relates to a handle assembly for a power tool according to the preamble of claim 1, and relates particularly, but not exclusively, to a vibration damping handle assembly for use with a hammer power drill.
  • Such a handle assembly is known from US2629364 .
  • DE 102009000598 discloses a supplementary handle for a hammer power drill having a vibration damping arrangement comprising a torsion spring provided at each axial end of a mount for the handle.
  • Preferred embodiments of the present invention seek to overcome one or more of the above disadvantages of the prior art.
  • a vibration damping mechanism comprising at least one elongate biasing member having at least one respective resilient portion extending without coiling thereof from said first mounting portion to said second mounting portion and adapted to engage said third mounting portion such that pivoting of the handle relative to the support member causes deformation of said resilient portion causing said resilient portion to oppose said pivoting of the handle relative to the support member
  • This provides the advantage of enabling simpler, more cost effective construction of the apparatus while enabling the apparatus to be more robust.
  • the advantage is also provided of enabling greater control of the vibration damping properties over a wider range of handle positions.
  • At least one said resilient torsion member may comprise at least one respective resilient sheet material.
  • This provides the advantage of enabling simpler construction of the resilient member by enabling it to be formed by stamping.
  • At least one said resilient torsion member may further comprise at least one enlarged portion adapted to be mounted to the support member and/or at least one mounting portion by means of screws.
  • This provides the advantage of enabling stresses applied to the resilient member to be spread over a larger surface area, thereby making the device more robust.
  • the handle and support member may be adapted to form a loop.
  • the apparatus may further comprise at least one limiting device for limiting pivoting movement of the handle relative to the support member.
  • At least one said limiting device may include at least one respective abutment member on the handle and/or the support member.
  • a handle assembly 2 for mounting a handle 4 to a forward part of a housing (not shown) of a power tool such as a hammer drill comprises a support member comprising a base 6 of durable plastics material having a generally partially cylindrical part 8 for abutting the housing of the power tool, and a flexible metal strap 10 which wraps around the housing to retain the base 6 in position on the housing.
  • the strap 10 is tightened or slackened by means of a rotatable knob 12.
  • the handle 4 has a grip 14 of suitable plastics material and first and second mounting parts 16 pivotably attached to the base 6 by means of a torsion spring 18 ( Figures 5 and 6 ).
  • the torsion spring 18 comprises a flat sheet of resilient metal such as steel having a central enlarged portion 20 and enlarged portions 22 at its ends.
  • the mounting parts 16 of the handle 4 are pivotably mounted to a third mounting part 24 on the base 6 such that the enlarged portions 22 of the torsion spring 18 are received in respective first and second mounting parts 16.
  • the enlarged portions 22 of the torsion spring 18 are attached to the first and second mounting parts 16 by means of screws 26, and the enlarged portion 20 at the centre of the torsion spring 18 is attached to the third mounting part 24 by means of a screw (not shown).
  • the ends of the first and second mounting parts 16 are closed by end caps 28 which are slidably received in respective apertures in the mounting parts 16.
  • the torsion spring 18 When no load is applied to the grip 14, the torsion spring 18 remains flat and the grip 14 remains in its rest position. However, when pressure is applied to the grip 14, the mounting parts 16 at the respective ends of the grip 14 cause the enlarged portions 22 at the ends of the torsion spring 18 to twist around the longitudinal axis of the torsion spring 18 relative to the enlarged portion 20 at the centre of the torsion spring 18, and twisting movement of the torsion spring 18 damps the transmission of vibrations from the body of the power tool via the base 6 to the grip 14.
  • the clamping mechanism 30 includes a pair of wedges 32 of triangular cross section which are attached to respective ends of the metal strap 10.
  • the wedges 32 are located in respective recesses 34 in the base 6, the length of the recess 34 in a direction transverse to the pivot axis 36 of the grip 14 being longer than the wedge 32.
  • a gap 38 is provided between the end of the recess 34 and the end of the wedge 32, and each wedge 32 is slidable relative to the base 6 by means of inclined surfaces 40 on the base 6.
  • Each wedge 32 is provided with an aperture 42 through which a bolt 44 passes, the bolt 44 extending from a head 46 which non-rotatably engages the external surface of the base 6, through the wedges 32 and through an aperture 50 through the base 6, and engages an internal bore 48 in the rotatable knob 12 by means of mutually engaging screw threads on the end of the bolt 44 and the internal bore 48 of the knob 12.
  • Rotation of the knob 12 in a first direction causes the knob 12 to move axially along the bolt 44, urging the wedges 32 towards each other.
  • the wedges 32 slide along the inclined surfaces 40 on the base 6 and move away from the part cylindrical support 8 on the base 6.
  • the aperture 50 through the base 6 has an elongated cross section, such as an oval shape, to accommodate movement of the bolt 44 in a transverse direction relative to the axis 36 of rotation of the grip 14. Rotation of the knob 12 in the opposite direction enables the wedges 32 to be moved in an opposite direction relative to the base 6 to loosen the strap 10 around the housing of the tool to enable the position of the handle 4 to be adjusted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Scissors And Nippers (AREA)

Description

  • The present invention relates to a handle assembly for a power tool according to the preamble of claim 1, and relates particularly, but not exclusively, to a vibration damping handle assembly for use with a hammer power drill.
  • Such a handle assembly is known from US2629364 . DE 102009000598 discloses a supplementary handle for a hammer power drill having a vibration damping arrangement comprising a torsion spring provided at each axial end of a mount for the handle.
  • This arrangement suffers from the drawback that the torsion springs must be highly robust, thereby increasing the cost of manufacture of the apparatus, and it is difficult to control the flexibility of the spring over a wide range of handle positions.
  • Preferred embodiments of the present invention seek to overcome one or more of the above disadvantages of the prior art.
  • US2629364 , US2007/143966 and EP0156387 all disclose vibration dampening techniques for handles on power tools.
  • According to the present invention, there is provided a handle assemblyin accordance with claim 1.
  • By providing a vibration damping mechanism comprising at least one elongate biasing member having at least one respective resilient portion extending without coiling thereof from said first mounting portion to said second mounting portion and adapted to engage said third mounting portion such that pivoting of the handle relative to the support member causes deformation of said resilient portion causing said resilient portion to oppose said pivoting of the handle relative to the support member, this provides the advantage of enabling simpler, more cost effective construction of the apparatus while enabling the apparatus to be more robust. The advantage is also provided of enabling greater control of the vibration damping properties over a wider range of handle positions.
  • At least one said resilient torsion member may comprise at least one respective resilient sheet material.
  • This provides the advantage of enabling simpler construction of the resilient member by enabling it to be formed by stamping.
  • At least one said resilient torsion member may further comprise at least one enlarged portion adapted to be mounted to the support member and/or at least one mounting portion by means of screws.
  • This provides the advantage of enabling stresses applied to the resilient member to be spread over a larger surface area, thereby making the device more robust.
  • The handle and support member may be adapted to form a loop.
  • The apparatus may further comprise at least one limiting device for limiting pivoting movement of the handle relative to the support member.
  • At least one said limiting device may include at least one respective abutment member on the handle and/or the support member.
  • A preferred embodiment of the invention will now be described, by way of example only and not in any limitative sense, with reference to the accompanying drawings, in which:
    • Figure 1 is a perspective view of a handle assembly of a first embodiment of the present invention;
    • Figure 2 is a top view of the assembly of Figure 1;
    • Figure 3 is a side view of the assembly of Figure 1;
    • Figure 4 is a cross sectional view along the line A-A in Figure 3;
    • Figure 5 is a cross sectional view along the line C-C in Figure 3;
    • Figure 6 is a cross sectional view along the line B-B in Figure 3;
  • Referring to Figures 1 to 6, a handle assembly 2 for mounting a handle 4 to a forward part of a housing (not shown) of a power tool such as a hammer drill comprises a support member comprising a base 6 of durable plastics material having a generally partially cylindrical part 8 for abutting the housing of the power tool, and a flexible metal strap 10 which wraps around the housing to retain the base 6 in position on the housing. The strap 10 is tightened or slackened by means of a rotatable knob 12. The handle 4 has a grip 14 of suitable plastics material and first and second mounting parts 16 pivotably attached to the base 6 by means of a torsion spring 18 (Figures 5 and 6). The torsion spring 18 comprises a flat sheet of resilient metal such as steel having a central enlarged portion 20 and enlarged portions 22 at its ends.
  • The mounting parts 16 of the handle 4 are pivotably mounted to a third mounting part 24 on the base 6 such that the enlarged portions 22 of the torsion spring 18 are received in respective first and second mounting parts 16. The enlarged portions 22 of the torsion spring 18 are attached to the first and second mounting parts 16 by means of screws 26, and the enlarged portion 20 at the centre of the torsion spring 18 is attached to the third mounting part 24 by means of a screw (not shown). The ends of the first and second mounting parts 16 are closed by end caps 28 which are slidably received in respective apertures in the mounting parts 16.
  • When no load is applied to the grip 14, the torsion spring 18 remains flat and the grip 14 remains in its rest position. However, when pressure is applied to the grip 14, the mounting parts 16 at the respective ends of the grip 14 cause the enlarged portions 22 at the ends of the torsion spring 18 to twist around the longitudinal axis of the torsion spring 18 relative to the enlarged portion 20 at the centre of the torsion spring 18, and twisting movement of the torsion spring 18 damps the transmission of vibrations from the body of the power tool via the base 6 to the grip 14.
  • Referring now to Figure 4, a clamping mechanism 30 for mounting the base 6 to the housing of the power tool is shown in greater detail. The clamping mechanism 30 includes a pair of wedges 32 of triangular cross section which are attached to respective ends of the metal strap 10. The wedges 32 are located in respective recesses 34 in the base 6, the length of the recess 34 in a direction transverse to the pivot axis 36 of the grip 14 being longer than the wedge 32. As a result, a gap 38 is provided between the end of the recess 34 and the end of the wedge 32, and each wedge 32 is slidable relative to the base 6 by means of inclined surfaces 40 on the base 6. Each wedge 32 is provided with an aperture 42 through which a bolt 44 passes, the bolt 44 extending from a head 46 which non-rotatably engages the external surface of the base 6, through the wedges 32 and through an aperture 50 through the base 6, and engages an internal bore 48 in the rotatable knob 12 by means of mutually engaging screw threads on the end of the bolt 44 and the internal bore 48 of the knob 12. Rotation of the knob 12 in a first direction causes the knob 12 to move axially along the bolt 44, urging the wedges 32 towards each other. As a result, the wedges 32 slide along the inclined surfaces 40 on the base 6 and move away from the part cylindrical support 8 on the base 6. This draws the ends of the metal strap 10 with the wedges 32 into the base 6, as a result of which the length of the strap 10 is shortened and the strap 10 is tightened around the housing of the power tool to clamp the handle 4 in position relative to the housing. The aperture 50 through the base 6 has an elongated cross section, such as an oval shape, to accommodate movement of the bolt 44 in a transverse direction relative to the axis 36 of rotation of the grip 14. Rotation of the knob 12 in the opposite direction enables the wedges 32 to be moved in an opposite direction relative to the base 6 to loosen the strap 10 around the housing of the tool to enable the position of the handle 4 to be adjusted.

Claims (6)

  1. A handle assembly for a power tool, the handle assembly comprising:-
    a support member (6) adapted to be mounted to a body of a power tool for supporting a handle on the power tool;
    a handle (4) adapted to be pivotably mounted to the support member (6), wherein first and second mounting portions (16) on one of the handle (4) and the support member (6) are pivotably mounted to respective ends of a third mounting portion (24) on the other of the handle (4) and the support member (6); and
    a vibration damping mechanism comprising at least one elongate biasing member (18) having at least one respective resilient portion extending without coiling thereof from said first mounting portion (16) to said second mounting portion (16) and adapted to engage said third mounting portion (24), the handle being capable of pivoting relative to the support member (6) to cause deformation of said resilient portion, said resilient portion opposing said pivoting of the handle (4) relative to the support member (6);
    characterised in that said elongate biasing member (18) is an elongate resilient torsion member having a first part mounted to the third mounting portion (24) and a respective second part (22) mounted to each of said first and second mounting portions (16) such that pivoting of the handle (4) relative to the support member (6) causes twisting of the elongate resilient torsion member to resiliently oppose pivoting of the handle (4) relative to the support member (6).
  2. An assembly according to claim 1, wherein at least one said resilient torsion member comprises at least one respective resilient sheet material.
  3. An assembly according to claim 1 or 2, wherein at least one said resilient torsion member further comprises at least one enlarged portion (20, 22) adapted to be mounted to at least one mounting portion (16, 24) by means of screws.
  4. An assembly according to any one of the preceding claims, wherein the handle (4) and support member (6) are adapted to form a loop.
  5. An assembly according to any one of the preceding claims, further comprising at least one limiting device for limiting pivoting movement of the handle (4) relative to the support member (6).
  6. An assembly according to claim 5, wherein at least one said limiting device includes at least one respective abutment member on the handle and/or the support member.
EP12168921.0A 2011-06-07 2012-05-22 Handle assembly for power tool Active EP2532484B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB201109492A GB201109492D0 (en) 2011-06-07 2011-06-07 Handle assembly for power tool
GB201113116A GB201113116D0 (en) 2011-07-29 2011-07-29 Handle assembly for power tool

Publications (3)

Publication Number Publication Date
EP2532484A2 EP2532484A2 (en) 2012-12-12
EP2532484A3 EP2532484A3 (en) 2013-05-08
EP2532484B1 true EP2532484B1 (en) 2017-01-11

Family

ID=46149221

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12168921.0A Active EP2532484B1 (en) 2011-06-07 2012-05-22 Handle assembly for power tool

Country Status (1)

Country Link
EP (1) EP2532484B1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2629364A (en) * 1950-06-16 1953-02-24 Ingersoll Rand Co Vibration absorbing handle for rock drills
EP0156387B1 (en) * 1984-03-30 1990-11-07 Makoto Minamidate Vibration-proof grip device
DE102005000202A1 (en) * 2005-12-23 2007-06-28 Hilti Ag Handle with vibration reducing device
DE102005000205A1 (en) * 2005-12-23 2007-06-28 Hilti Ag Handle of a hand-held tool device
DE102009000595A1 (en) 2008-02-15 2009-08-20 Minda Schenk Plastic Solutions Gmbh Vibration-decoupled handle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2532484A3 (en) 2013-05-08
EP2532484A2 (en) 2012-12-12

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