Handheld machine tool

Patent metadata

Field	Value
Publication number	US-10828707-B2
Application number	US-201616336145-A
Country	US
Kind code	B2
Filing date	Sep 28, 2016
Priority date	Sep 28, 2016
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

The present disclosure relates to a hand-held machine tool. The hand-held machine tool includes: a first moving component as a main vibration source, the first moving component reciprocating substantially in a straight line in a first direction; a second moving component as a secondary vibration source, the second moving component having a movement state different from that of the first moving component; and a balancing block, with a linear movement direction of the balancing block being a second direction in a different plane from that of the first direction, and a movement pace of the balancing block being opposite to that of the first moving component.

First claim

The invention claimed is:

1. A hand-held machine tool, comprising:
a first moving component as a main vibration source, the first moving component reciprocating substantially in a straight line in a first direction and arranged in a first plane;
a second moving component as a secondary vibration source, the second moving component having a second movement state different from a first movement state of the first moving component; and
a balancing block configured to move linearly in a second direction and arranged in a different plane than the first plane and non-parallel to the first plane, a movement pace of the balancing block being opposite to a movement pace of the first moving component.

2. The hand-held machine tool according to claim 1 , wherein an included angle of the first direction and the second direction is set such that a stability of a specific region of the hand-held machine tool is optimized when the hand-held machine tool is operating.

3. The hand-held machine tool according to claim 2 , wherein the specific region is a hand-grip region of the hand-held machine tool.

4. The hand-held machine tool according to claim 2 , wherein the included angle between the first and second directions is determined in the different plane with the first direction projected onto the different plane, the included angle being greater than zero.

5. The hand-held machine tool according to claim 1 , wherein the hand-held machine tool further comprises a linked-movement mechanism between the first moving component and the balancing block.

6. The hand-held machine tool according to claim 5 , wherein the linked-movement mechanism is one of a crank slideway mechanism and an oscillating bearing mechanism.

7. The hand-held machine tool according to claim 1 , wherein the hand-held machine tool comprises a guide member configured to guide the balancing block to move linearly in the second direction.

8. The hand-held machine tool according to claim 7 , wherein the guide member is one of a guide groove and a guide rod.

9. The hand-held machine tool according to claim 7 , wherein:
a first slide groove is defined at a first end of the balancing block and a second slide groove is defined at a second end of the balancing block, the first slide groove and the second slide groove being parallel or on the same line, and
the guide member has a flat guide face, with guide pins provided on the guide face in the second direction, the guide pins being engaged in the first slide groove and the second slide groove of the balancing block respectively.

10. The hand-held machine tool according to claim 9 , wherein the guide member defines a recess or through-hole for avoiding interference.

11. The hand-held machine tool according to claim 9 , wherein backstop members are disposed on the guide pins, the backstop members configured to limit the balancing block to being in close contact with the guide face.

12. The hand-held machine tool according to claim 1 , wherein the first direction passes through a center of mass of the first moving component, and the second direction passes through a center of mass of the balancing block.

13. The hand-held machine tool according to claim 1 , wherein the hand-held machine tool is a hand-held reciprocating saw and the first moving component is a saw blade or a saw blade drive mechanism, or the hand-held machine tool is a hand-held electric hammer and the first moving component is one of a hammer implement and a hammer implement drive mechanism.

14. The hand-held machine tool according to claim 1 , wherein the second moving component comprises a gear which rotates in a plane parallel to the first direction, the gear configured to simultaneously drive the first moving component and the balancing block to move, and the second movement state comprising a third movement state causing the gear to have an inertia force in a direction other than the first direction when rotating.

15. The hand-held machine tool according to claim 14 , wherein the second movement state further comprises a fourth movement state causing the gear to have a tendency to turn over perpendicularly to a gear shaft of the gear when rotating.

16. The hand-held machine tool according to claim 1 , wherein the second moving component comprises a gear configured to simultaneously drive the first moving component and the balancing block to move, and a center of mass of the machine tool as a whole and the first direction define a center of mass plane, the second movement state comprising a third movement state causing the gear to have an inertia force outside the center of mass plane when rotating.

17. The hand-held machine tool according to claim 16 , wherein the second moving component further comprises an accompanying moving component, which is driven by the gear and swings outside the center of mass plane.

18. The hand-held machine tool according to claim 17 , wherein the accompanying moving component is a swing rod member, which is associated with the gear and periodically drives the first moving component to swing forwards.

19. The hand-held machine tool according to claim 1 , wherein the first direction and the second direction are non-parallel for any position of the first moving component in the first movement state.

Assignees

• Bosch Power Tools China Co Ltd
• Bosch Gmbh Robert

Inventors

• Wang Jia

Classifications

• B23D51/161 Primary

  with dynamic balancing · CPC title

• B27B3/12

  Mechanisms for producing the reciprocating movement of the saw frame; Arrangements for damping vibration; Arrangements for counter-balancing (B27B3/26 takes precedence) · CPC title

• B23D49/162

  Pad sawing devices · CPC title

• B25F5/001

  Gearings, speed selectors, clutches or the like specially adapted for rotary tools · CPC title

• B23D49/16

  actuated by electric or magnetic power or prime movers (B23D49/11 takes precedence) · CPC title