EP1075912B1 - Motorized hand tool with at least one hollow shaped hand grip - Google Patents

Description

The invention relates to a motor-operated hand tool, in particular Motor or chain saw, with at least one handle, which is hollow is formed, and a drive motor, in particular an internal combustion engine or an electric motor, wherein a fluid cooling for the Internal combustion engine is provided with a cooling fluid flow, according to the Preamble of claim 1.

For longer work with a motorized hand tool, which high vibrations transmitted to a handle, it may be due to these vibrations to circulatory disorders in the hands of an operator come, which holds the hand tool on the handle. These Illness is also called "white-finger disease". Such conditions occur especially in motor or chain saws, where deep Temperatures reinforce this effect. It was therefore already Chainsaws with electric handle heating developed and sold. These However, due to the small numbers are relatively expensive, have high Cost of production and a high development effort, and all machines a construction kit of the same type, even those without handle heating, need with the necessary space cut-outs for the components electric handle heating, such as generator, wiring and Switch be provided, which is unnecessary for the user without handle division Width and weight, thus disadvantages in handling means.

A power chain saw holding a handle with sucked Air and exhaust warms up is known from DE 1 628 927.

The object of the present invention is an improved hand tool to provide the above type, which is the above Disadvantages eliminated and thus at low temperatures the danger permanent damage to circulatory disorders Avoids hands of an operator.

This task is performed by a hand tool of the o.g. Kind of claim 1 marked features solved.

For this purpose, it is inventively provided that the handle at least an inlet opening and at least one outlet opening, wherein the inlet opening and the outlet opening are arranged such that the cooling fluid flow downstream of the drive motor via the inlet opening in enters the handle, over a predetermined section through the Handle flows and over the outlet opening again from the handle exit.

This has the advantage of being inexpensive and without additional costs Space requirement a handle heating is realized, with additional equipment, such as a generator, a wiring or a switch, are not required. Any powered hand tool can as well subsequently easy and low cost with this invention Handle heating to be equipped.

Preferably, further developments of the device are in the claims 2 to 9 described.

In a preferred embodiment, the fluid cooling is air cooling and the cooling fluid flow is a cooling air flow.

A simple and inexpensive construction is achieved by the fact that in the cooling air flow downstream of the drive motor adjacent to the handle arranged to the inlet opening mounted air guide so and is configured such that the cooling air flow at least partially from the Detected air guide and directed into the inlet opening on the handle becomes. This louver is formed for example as a baffle and attached to the handle or plugged or snapped.

In an alternative preferred embodiment, the fluid cooling is a water cooling and the cooling fluid flow a cooling water flow.

A simple control of the strength of the handle heating or a temperature achieved on the handle, characterized in that a first slide for optional Opening, partially opening or closing the inlet opening and / or a second slider for selective opening, partially open or closing the outlet opening is provided.

Conveniently, the handle is a bow handle or all-round grip and For example, designed as a metal pipe handle or plastic.

In a preferred embodiment, a device for guiding the cooling air flow downstream of the drive motor to the inlet opening in a tank-handle system, integrated trained.

Fig. 1

in schematischer, perspektivischer Darstellung eine erste bevorzugte Ausführungsform bei der Luftführung und Einlaß in den Tank integriert sind

Fig. 2

in schematischer, perspektivischer Darstellung eine zweite bevorzugte Ausführungsform bei der Luftführung und Einlaß in den Rundumgriff integriert sind

Fig. 3

in schematischen, perspektivischen Darstellung der Version Fig. 2" von der gegenüberliegenden Seite gesehen

Fig. 4

in schematischer, perspektivischer Darstellung der Version Fig. 1" von der gegenüberliegenden Seite gesehen mit integriertem Stellelement

Fig. 5

in einer weiteren schematischen, perspektivischen Darstellung der Version "Fig. 4"

Fig. 6

in schematischer, perspektivischer Darstellungen die Beheizung des hinteren Handgriff

Fig. 7

in schematischer, perspektivischer Darstellung die Version Fig. 6" mit integriertem Stellglied, dargestellt von der gegenüberliegenden Seite

The invention will be explained in more detail with reference to the accompanying drawings. These show:

Fig. 1

in a schematic, perspective view of a first preferred embodiment in the air duct and inlet are integrated into the tank

Fig. 2

in a schematic, perspective view of a second preferred embodiment in the air duct and inlet are integrated into the wrap-around handle

Fig. 3

in a schematic, perspective view of the version Fig. 2 "seen from the opposite side

Fig. 4

in a schematic, perspective view of the version Fig. 1 "seen from the opposite side with integrated actuator

Fig. 5

in a further schematic, perspective representation of the version "Fig. 4"

Fig. 6

in schematic, perspective views the heating of the rear handle

Fig. 7

in a schematic, perspective view of the version Fig. 6 "with integrated actuator, shown from the opposite side

The invention will be described below with reference to the in Figs. 1 to 7 Hand tools in the form of a chainsaw with internal combustion engine explained, this is to be understood only as an example. The invention is Can be used with any hand-operated power tool, such as For example, hedge trimmer, hammer drill, etc.

The chain saw shown in various embodiments of FIG. 1 to 7 100, 200, 300, 400 comprises a bow handle 10, a rear one Handle 11, an internal combustion engine 12 and a hand guard 14 (Fig. 1 to 4).

In the embodiments 100, 200, 300 illustrated in FIGS. 1 to 5 an air guide 16/17 is provided which a cooling air flow 18th downstream of the engine 12, i. an airflow 18, which already Absorbed heat from the internal combustion engine 12 and transported away, to an inlet opening 20 passes. This by the waste heat the internal combustion engine 12 heated cooling air flow 18 heats in turn when flowing through the hollow and an air duct 13 forming Bow handle 10 this, so that a hand of an operator, which holding the hand tool on the bow handle 10, is heated accordingly.

This cooling air flow 18 occurs at an outlet opening 22 again from the Bow handle 10, so that constantly warm air again 18 on the louver 16 can flow. When in Figs. 1,4 and 5 shown Embodiment 100, 300 is the louver 16 and the Air inlet into the bow handle 10 integrated into a fuel tank handle system 32, whereas in the embodiment 200 shown in Figs. 2 and 3, the spoiler 16 is formed as a separate air baffle, which on the bow handle 10 is attached or molded onto the bow handle.

In the third preferred embodiment shown in FIGS. 4 and 5 300, an adjusting element 24 is additionally provided, which in FIG. 5 visible inlet opening 20 on the bow handle 10 by movement in the direction of the arrow 25 either closes, partially opens or completely opens. With this actuator 24 can by appropriate choice of its position the temperature or heat output at the bow handle 10 can be adjusted. In the position shown in Fig. 4, the actuator 24 is in the position "fully open", with a maximum heat output on the bow handle 10 is available. As is further apparent from Fig. 4, am Bügeigriff 10 an additional screw 26 is provided, which a additional support and storage of the bow handle 10 available provides. Corresponding ribs 28 (FIG. 5) serve as chip protection in front of the Inlet opening 20.

Due to the at least partial diversion of the warm, the engine 12th coming cooling air 18 through the bow handle 10 therethrough is the latter warmed up, so that the likelihood of the "white-finger disease" is substantially reduced, without additional components, such as generator, electrical heating conductor, wiring etc. This is on the coupling side on the bow handle 10, the louver 16 is provided as an air catcher, which at least a portion of heated cooling air 18 in the bow handle 10 redirects. The air 18 occurs e.g. on the magnet side at the bottom Outlet opening 22 (Fig. 1). The handle heating according to the invention is both with a bow handle 10 as a metal tube as well as with a Plastic manufactured bow handle 10 can be realized.

In a metal tube handle 10, the inlet opening 20 and the outlet opening 22, for example, by radial, mechanical post-processing brought in. Alternatively, the openings 20, 22 by attachments, such as a metal casting realized. Furthermore, it is possible also the inlet and outlet openings 20, 22 in the tank 32 to integrate, in which case the cooling air flow 18 preferably axially into the metal tube handle 10 is initiated.

In a plastic round handle 10, the openings 20, 22 through Reworking, by a subsequent shifting of inserts in the Plastic tool or by a grain melting technology Bow handle can be produced.

In the embodiment illustrated in FIGS. 6 and 7, heating takes place the rear handle 11 of the chain saw 400. In this case, the occurs by waste heat heated air flow 18 into the inlet opening 20 a is through the air duct 13 through the rear handle 11 to the outlet opening 22 led. The air duct 13 is in the fuel tank-handle system 32 integrated. In Fig. 7, the rotatable actuator 24 for the setting of the heating power shown in the different Options for the heating capacities, which are indicated by the symbol positions 30 are marked, snaps. The opening and closing of the air duct 13 takes place by turning the adjusting element 24th

LIST OF REFERENCE NUMBERS

100,200,300,400

chainsaw

10

bow handle

11

rear handle

12

Internal combustion engine

13

air duct

14

hand protection

16

Air guiding device on the fuel tank

17

Air baffle / wing on bow handle

18

airflow

20

inlet opening

22

outlet opening

24

actuator

25

arrow

26

additional screw connection

28

ribs

29

actuator

30

symbols

32

Fuel tank Handle System

Claims (9)

1. A motor-operated hand tool (100, 200, 300, 400), in particular a motor saw or a chainsaw, comprising at least one or several handles (10, 11) which is/are hollow, and a drive motor (12), in particular of an internal combustion engine or an electric motor, wherein at least one of the handles (10, 11) comprises at least one inlet aperture (20) and at least one outlet aperture (22),
   characterised in that
   a liquid-cooling system for the drive motor (12) with a cooling liquid flow (18) is provided, and in that the inlet aperture (20) and the outlet aperture (22) are arranged such that the cooling liquid flow (18) of the drive motor (12) enters the handle (10, 11 ) by way of the inlet aperture (20), flows by way of a predefined section through the handle (10, 11), and exits said handle (10, 11) by way of the outlet aperture (22).
2. The hand tool according to claim 1,
   characterised in that
   the liquid-cooling system is an air cooling system and in that the cooling liquid flow is a cooling air flow (18).
3. The hand tool according to claim 2,
   characterised in that
   in the cooling air flow (18) downstream of the internal combustion engine, an air guiding device (16), in particular an air guiding plate, which is attached to the handle adjacent to the inlet aperture (20), is arranged such that the cooling air flow (18) enters the inlet aperture (20) at the handle (10, 11) so as to be at least partly guided by the air guiding device.
4. The hand tool according to claim 3,
   characterised in that
   the air guiding device (16) is pushed onto, snapped onto, or formed to, the handle (10).
5. The hand tool according to claim 1,
   characterised in that
   the liquid-cooling system is a water cooling system, and in that the cooling liquid flow is a cooling water flow.
6. The hand tool according to any one of the preceding claims,
   characterised in that
   at least one final control element (24) is provided for optional opening, partial opening or closing the inlet aperture (20) and/or the outlet aperture (22).
7. The hand tool according to any one of the preceding claims,
   characterised in that
   the handle (10) is a bow-type handle or an all-around handle.
8. The hand tool according to any one of the preceding claims,
   characterised in that
   the handle (10) is a tubular metal handle or a plastic handle.
9. The hand tool according to any one of the preceding claims,
   characterised in that
   a device (16) for guiding the cooling liquid flow (18) downstream of the drive motor (12) to the inlet aperture (20) is provided so as to be integral in a tank-handle-system (32), in particular a tank for operating means, such as for example a fuel tank or a lubricating-oil tank.

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