Auxiliary handle

• US 20090307875A1
• Filed: 06/12/2009
• Published: 12/17/2009
• Est. Priority Date: 06/17/2008
• Status: Active Grant

• Current Assignee: Makita Corporation
• Original Assignee: Makita Corporation
• Inventors: Bito, Shinya, Nakashima, Keiji, Arakawa, Takuo
• Granted Patent: US 8,621,719 B2
• Time in Patent Office: Days
• US Class Current: 16/436
• CPC Class Codes: B25F 5/006 Vibration damping means
• CPC Class Codes: B25F 5/026 in the form of an auxiliary handle B25F5/024 takes precedence

Abstract

It is an object of the invention to provide a technique for a reduction of vibration of an auxiliary handle for a hand-held power tool. The object can be achieved by a representative auxiliary handle. The auxiliary handle includes a ring-like mounting part, a pair of bases, a rod-like grip, one or arms and an elastic region. The bases are formed on a free end of the mounting part. The bases of the mounting part and extending end portions of the arms are arranged parallel to the longitudinal direction of the grip. The bases of the mounting part and the extending end portions of the arms are clamped by a bolt and a nut such that the mounting part holds the power tool body. The elastic region is provided in at least one of the mounting part, the bases and the extending end portions of the arms.

Claims

1. An auxiliary handle comprising:

a ring-like mounting part which is capable of holding a power tool body of a hand-held power tool from outside,

a pair of bases formed on a free end of the mounting part,

a rod-like grip to be held by a user,

one or arms provided with the grip, the arms extending in a direction transverse to a longitudinal direction of the grip, wherein the bases of the mounting part and extending end portions of the arms are arranged parallel to the longitudinal direction of the grip, and wherein the bases of the mounting part and the extending end portions of the arms are clamped by a bolt and a nut such that the mounting part holds the power tool body and

an elastic region to reduce vibration, the elastic region being provided in at least one of the mounting part, the bases and the extending end portions of the arms.

2. The auxiliary handle as defined in claim 1, wherein the elastic region is provided on a holding face of the mounting part which holds the power tool body.

3. The auxiliary handle as defined in claim 1, wherein a ring component and the associated base of the mounting part are joined together into one piece via the elastic region.

4. The auxiliary handle as defined in claim 1, further comprising a surrounding member which surrounds the base of the mounting part and is prevented from moving in a circumferential direction with respect to the extending end portion of the arm, wherein the elastic region is provided between an inner circumferential surface of the surrounding member and an outer circumferential surface of the base.

5. The auxiliary handle as defined in claim 4, wherein the base and the surrounding member have respective flat surfaces which are opposed to each other in a direction of tightening by the bolt and the nut, and a washer is disposed between the opposed flat surfaces.

6. The auxiliary handle as defined in claim 1, wherein an intermediate member is disposed between the base of the mounting part and the extending end portion of the arm and prevented from moving in a circumferential direction with respect to the base of the mounting part, and wherein one of the extending end portion and the intermediate member has a projection extending in an axial direction of the bolt, while the other of the extending end portion and the intermediate member has a recess which is fitted on the projection in such a manner as to be movable with respect to the projection, and wherein the elastic region is provided between an outer circumferential surface of the projection and an inner circumferential surface of the recess.

7. The auxiliary handle as defined in claim 6, wherein a washer is disposed between an end surface of the projection in the longitudinal direction and a bottom of the recess which are opposed to each other in a direction of tightening by the bolt and the nut.

8. The auxiliary handle as defined in claim 6, wherein the elastic region comprises a spherical or pin-like rubber and is supported by the recess and the projection such that share deformation of the spherical or pin-like rubber is provided at least in the direction of a z-axis where the direction of the z-axis defined by a longitudinal axis of the power tool body and directions of a y-axis and an x-axis which intersect with the z-axis are concerned.

9. The auxiliary handle as defined in claim 1, wherein the grip has two arms extending from longitudinal ends of the grip in a direction transverse to the longitudinal direction, and the extending end portions of the arms are connected together by a transverse part which extends transversely to the arms, so that the grip is configured as a closed-loop frame structure.

10. The auxiliary handle as defined in claim 1, wherein the grip has two arms extending from longitudinal ends of the grip in a direction transverse to the longitudinal direction, and the extending end portion of one of the arms is fixed to the base of the mounting part by the bolt and the nut, while the extending end portion of the other arm has a free end.

11. The auxiliary handle as defined in claim 1, wherein the grip has three arms which extend from the both longitudinal ends of the grip and from a midpoint therebetween respectively in a direction transverse to the longitudinal direction of the grip, and the extending end portion of the middle one of the three arms is fixed to the base of the mounting part by the bolt and the nut, while each of the extending end portions of the other two arms has a free end.

12. The auxiliary handle as defined in claim 1, wherein a dynamic vibration reducer is installed in the grip and has a different elastic element from the elastic region and a weight which moves with respect to the grip via the elastic element.

13. The auxiliary handle as defined in claim 12, wherein the grip is hollow, and the weight is disposed in a hollow portion of the grip and has a columnar shape extending in the longitudinal direction of the grip, and wherein the elastic element is spherical and disposed between a recess formed in an end of the weight in an extending direction of the weight and a recess opposed to the recess of the weight and formed in an inner wall surface of the hollow portion of the grip.

14. A hand-held power tool having the auxiliary handle as defined in claim 1.

15. An auxiliary handle, including:

a ring-like mounting part which is capable of holding a power tool body of a hand-held power tool from outside,

a pair of bases formed on a free end of the mounting part, and

a rod-like grip to be held by a user, the grip having one or more arms extending in a direction transverse to a longitudinal direction of the grip, wherein the bases of the mounting part and extending end portions of the arms are arranged parallel to the longitudinal direction of the grip, and the bases of the mounting part and the extending end portions of the arms are clamped by a bolt extending therethrough in the longitudinal direction of the grip and a nut, so that the mounting part holds the power tool body, and

a dynamic vibration reducer is installed in the grip and has a different elastic element from the elastic region and a weight which moves with respect to the grip via the elastic element.

16. The auxiliary handle as defined in claim 15, wherein the grip has an internal space and the dynamic vibration reducer is disposed in the internal space.