Anti-vibration handle comprising a tensile-loaded switch connection

Abstract

An electric machine tool includes a first actuating device and a second actuating device. The second actuating device is arranged at a distance from the first actuating device. The first actuating device is mechanically connected to the second actuating device by a switching connector which is configured to be loaded in tension only.

Claims

1. An electric machine tool, comprising: a first actuating device; a second actuating device arranged at a distance from the first actuating device; a switching connector configured to mechanically connect the first actuating device to the second actuating device, the switching connector configured to transmit only tensile load between the first and second actuating devices; a tool housing; and an anti-vibration handle casing supported on the tool housing by an elastic connecting mechanism, wherein; the first actuating device is disposed in the tool housing, the second actuating device is disposed in the handle casing, and the switching connector is adapted and arranged to bear against the elastic connecting mechanism and does bear against the elastic connecting mechanism while tensile load is transmitted by the switching connector.

2. The electric machine tool as claimed in claim 1, wherein: the switching connector has a first end and a second end, the first end is fixed to the first actuating device, and the second end is fixed to the second actuating device.

3. The electric machine tool as claimed in claim 1, wherein: the switching connector is configured such that the first actuating device is adjustable by adjustment of the second actuating device and the second actuating device is adjustable by adjustment of the first actuating device, when the switching connector is subjected only to tensile load.

4. The electric machine tool as claimed in claim 1, wherein the switching connector has an invariable length.

5. The electric machine tool as claimed in claim 1, wherein the switching connector is one of a band, a wire, and a stamped bent part.

6. The electric machine tool as claimed in claim 1, wherein: the elastic connecting mechanism is configured to stretch to a stretched length when supporting the tool housing, and the stretched length of the elastic connecting mechanism is constant.

7. The electric machine tool as claimed in claim 1, wherein the elastic connecting mechanism is a leaf spring.

8. The electric machine tool as claimed in claim 1, wherein the first actuating device includes an operating mode switch, configured to switch the electric machine tool between at least two operating modes.

9. The electric machine tool as claimed in claim 1, wherein the second actuating device is a locking device configured to fix a switching device in a switch-on position and a switch-off position.

10. The electric machine tool as claimed in claim 2, wherein the first actuating device includes a slide bar, configured to adjust in a sliding direction to switch the electric machine tool between at least two operating modes.

11. The electric machine tool as claimed in claim 10, wherein the first end of the switching connector is fixed to the slide bar.

12. The electric machine tool as claimed in claim 10, wherein the slide bar is configured to be displaced to switch the electric machine tool between further different operating modes.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) The disclosure is described below with reference to the FIGURE. The FIGURE is merely illustrative and does not restrict the general concept disclosed.

(2) The FIGURE shows an electric machine tool 1 comprising a handle casing 3 configured as an anti-vibration handle casing.

DETAILED DESCRIPTION

(3) The handle casing 3 is supported on a tool housing 2 by means of an elastic connecting means 7, here a leaf spring. Below, the terms elastic connecting means 7 and leaf spring are used synonymously. The leaf spring 7 here has a first end (non-visible) and a second end 72, wherein it is connected by its first end fixedly to the tool housing 2. The handle casing 3 is supported at the second end 72 of the leaf spring 7 on the top side 73 thereof, so that it can compress both in the horizontal and in the vertical direction. A relative movement of several millimeters between the tool housing 2 and the handle casing 3 is thereby possible. Between the tool housing 2 and the handle casing 3 is provided a bellows element 21, so that the relative movement between the tool housing 2 and the handle casing 3 is possible without damaging the tool housing 2 or the handle casing 3.

(4) Inserted detachably in the handle casing 3 is a grip molding 31, so that machine components disposed in the handle casing 3 are accessible from outside.

(5) The electric machine tool 1 of this illustrative embodiment is a hammer drill, which can be adjusted by means of an operating mode switch 41 into the drilling, hammer drilling and chipping operating modes. The operating mode switch 41 is a component part of a first actuating device 4, which further comprises a slide bar 42. The slide bar 42 is displaceable by adjustment of the operating mode switch 41 in or counter to a sliding direction 43 from one of the operating modes into another of the operating modes.

(6) For this, the operating mode switch 41 comprises cams (not visible), which displace the slide bar 42 against the force of a compression spring 44, supported on the tool housing 2, in the displacement direction 43 when adjustment is made from one operating mode into the other operating mode.

(7) To the slide bar 42 is fixed a first end 61 of a switching connector 6. In the present illustrative embodiment, the first end 61 is hooked on under the preload of a spring 63. However, embodiments in which the switching connector 6 is fixedly connected to the slide bar 42, for instance by screwing or clipping, are also preferred.

(8) A second end 62 of the switching connector 6 is fixed to a tilt lever part 51 of a second actuating device 5, of which only the tilt lever part 51 is visible here. The second actuating device 5 of this illustrative embodiment is a locking device. Below, the terms second actuating device 5 and locking device are used synonymously.

(9) To be precise, the second end 62 is hooked here in the tilt lever part 51, which is of hook-shaped configuration. It is also preferred, however, to fixedly connect the second end 62 to the second actuating device 5. Also preferred is an embodiment in which the second actuating device 5 comprises, instead of a tilt lever part 51, a sliding part (not represented), to which the second end 62 of the switching connector 6 is fixed.

(10) By means of the locking device 5, a switching device 9, configured here as a pawl, can be locked in a switch-on position. Below, the terms switching device 9 and pawl are used synonymously. The pawl 9 here has an upper pawl part 91 for the adjustment into the switch-on position and a lower pawl part 92 for the resetting into the switch-off position. By means of the pawl 9, an electric switch 8 can be switched, wherein the electric switch 9 switches a circuit (not shown), which in the switch-on position of the pawl 9 is closed, so that the electric machine tool 1 is driven, and in the switch-off position of the pawl 9 is open, so that the electric machine tool 1 is switched off.

(11) When the operating mode switch 41 is adjusted from drilling operation or from hammer drilling operation into chipping operation, the slide bar 42 is displaced in the displacement direction 43 by means of the cam contour of the operating mode switch 41. The slide bar 42 thereby pulls on the switching connector 6, so that the locking device 5 is adjusted out of a basic position against an adjusting force (here indicated by the arrow 52) by means of the tilt lever part 51 into a locking position. When the upper pawl part 91 is pressed, or if the upper pawl part 91 is already pressed, the pawl 9 is thus locked in the switch-on position. By pressing of the lower pawl part 92, the pawl 9 is adjusted from the switch-on position into the switch-off position.

(12) When the operating mode switch 41 is reset from chipping operation into drilling operation or into hammer drilling operation, the slide bar 42 is displaced against the sliding direction 43 with the aid of the compression spring 44. Since the switching connector 6 is invariable in length, it follows the sliding movement of the slide bar 42, so that the locking device 5 is reset from the locking position into the basic position. The locking device 5 is here drawn back into the basic position by means of the adjusting force 52, whereupon the switching connector 6 is subjected to tensile load.

(13) Both in the adjustment of the locking device from the basic position into the locking position and in the resetting from the locking position into the basic position, the switching connector 6 is therefore subjected only to tensile load. Moreover, the switching connector 6, in the embodiment as a band, can also withstand only tensile load.

(14) The electric switch 8, the pawl 9 and the locking device 5 are here accessible from outside by detachment and removal of the grip molding 31.

(15) The switching connector 6 is supported on the leaf spring 7. Due to the spring preload of the leaf spring 7, the switching connector 6 also bears against the leaf spring 7 in the event of relative movements of the handle casing 3 in relation to the tool housing 2. Since the length of the leaf spring 7 does not change, that part of the switching connector 6 which bears against the leaf spring 7 also remains unchanged or substantially unchanged. The distance between the first end 61 of the switching connector 6 and the second end 62 of the switching connector 6, despite the relative movement of the handle casing 3 to the tool housing 2, therefore also remains unchanged or virtually unchanged, so that both the slide bar 42 and the locking device 5 remain in their position and the operating mode of the electric machine tool 1 does not change.

(16) Upon the displacement of the slide bar 42, a magnet 10, with which a Hall sensor (not represented) disposed in the speed control unit (not represented) is switched, is here simultaneously displaced. In chipping operation, the turbo mode motor function of the electric machine tool 1 can hence additionally be activated.