A portable hand-held power tool (2), especially in the form of a drilling or chisel hammer, includes a drive assembly (8) located in the tool housing (10) for driving a tool spindle (4) along an operational axis (A), a first handle (16) which is rotatable around a first pivotal axis (S1) by a first handle suspension (22), a second handle (20) located on the opposite sides (14.1, 14.2) of the housing which is rotatable around a second pivotal axis (S2) by a second handle suspension (24), and spring elements for retaining the handles (16, 20) in their initial position, with the first and second handle suspensions (22, 24) extending partially circumferentially about the drive assembly (8).
Description
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
FIG. 1 shows a schematic view of a hand-held power tool with a vibration-reducing handle assembly according to the present invention; and
FIG. 2 shows a perspective view of the handle assembly according to FIG. 1.
Claims
1. A portable hand-held power tool (2), comprising:
a housing (10);a drive assembly (8) located in housing (10) for driving a tool spindle (4) extending along an operational axis (A),a first handle (16) rotatable around a first pivot axis (S1) and a second handle (20) rotatable around a second pivot axis (S2), the first and second handles (16, 20) being arranged on the opposite sides (14.1, 14.2) of the housing (10);first (22) and second (24) handle suspensions for rotating, respectively, the first (16) and second (20) handles about the first (S1) and second (S2) pivot axes, respectively, the first handle suspension (22) and the second handle suspension (24)partially extending circumferentially around the drive (8); andspring means (46) for biasing the first and second handles (16, 20) to an initial position thereof.
2. A hand-held power tool as defined in claim 1, wherein between the first handle suspension (22) and the second handle suspension (24), a first damping body (32.1; 32.2) is provided which forms a first end stop (30.1; 30.2), and a second end stop (38.1; 38.2), against which the first (22) and the second (24) handle suspensions are put up.
3. A hand-held power tool as defined in claim 2, wherein the first damping body (32.1, 32.2) limits a pivot motion of the first handle suspension (22) and a pivot motion of the second handle suspension (24) in both pivot directions.
4. A hand-held power tool as defined in claim 3, wherein the damping body (32.1; 32.2) is diamond-shaped.
5. A hand-held power tool as defined in claim 1, wherein the handle suspensions (22, 24) each comprises a fork-shaped support (25, 44) that is respectively provided at a first side (34) of the drive assembly (8) and at a second opposite side (36) of the drive assembly (8) and is associated with a respective pivot support (21.1, 21.2) for rotation around the respective pivot axes (S1, S2).
6. A hand-held power tool as defined in claim 5, wherein the pivot axes (S1, S2) are spaced from respective effective points of application (G1, G2) of the respective handles (16, 20) by a distance (a) from 13 to 19 cm.
7. A hand-held power tool as defined in claim 6, wherein the pivot axes (S1, S2) are spaced from respective effective points of application (G1, G2) of the respective handles (16, 20) by a distance (a) from 15 to 18 cm.
8. A hand-held power tool as defined in claim 5, wherein an elastomer ring (23) is provided between the pivot axes (S1, S2) and the handle suspensions 22, (24).
9. A hand-held power tool as defined in claim 5, wherein the first damping body (32.1) is positioned at a first side (34) of the drive assembly (8), and the second damping body (32.2) at a second side (36) of the drive assembly (8).
10. A hand-held power tool as defined in claim 1, wherein the spring means (46) comprises two helical springs (48) which extend transversally to the operational axis (A), and are arranged between a spring support (50) solidly fixed to the housing and a respective one of the handle suspensions (22, 24).
Patent Application
20070144750
