GB2372957A

GB2372957A - Hand-held machine tool with a handle accommodating electrical components

Info

Publication number: GB2372957A
Application number: GB0202524A
Authority: GB
Inventors: Otto Baumann; Dietmar Saur; Juergen Schlipf; Sven Kageler; Hardy Schmid
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2001-02-03
Filing date: 2002-02-04
Publication date: 2002-09-11
Anticipated expiration: 2022-02-04
Also published as: CH695291A5; GB0202524D0; DE10104866A1; GB2372957B

Abstract

The hand-held machine tool has a handle 5, which forms a space for accommodating electrical components 7, 9, 13. So that a technical service can be carried out on the handheld machine tool without great assembly effort, the handle 5 has an opening 15 that can be closed by means of a cover 17, which opening facilitates rapid access to the electrical components 7, 9, 13 in the handle 5. Preferably the swivel 19 mounted cover 17 is fastened by captive screws 21.

Description

J ROBERT BOSCH GMBH, 70442 Stuttgart 5 Hand-held machine tool with a

handle accommodating electrical components Prior art

10 The present invention concerns a hand-held machine tool with a handle moulded onto its housing, which handle forms a space for accommodating electrical components, preferably means for the power supply and/or means for switching and controlling an electric drive located in the housing.

Such a type of hand-held machine tool in whose handle are arranged power supply leads, switches and also parts of the electric drive, is described in DE 197 03 746. The hand-

held machine tool can, for example, be a hammer drill or an 20 impact drill with a pistol-type or L-shaped handle, for example. Any other type of hand-held machine tool with a handle can be equally considered for use in this invention on which the application is based. The housing on which the handle of the hand-held machine tool is disposed can be of 25 a shell or pot type of construction. Above all, hand-held machine tools which are subjected to rigorous use need a technical service from time to time. During this, carbon brushes or cables may have to be replaced.

30 The object of the invention is to specify a hand-held machine tool of the type stated at the outset, in which a technical service can be carried out with least possible assembly effort.

Advantage of the invention The stated object is achieved with the features of Claim 1,

in that the handle of the hand-held machine tool has an 5 opening that can be closed by means of a cover, which opening facilitates access to the means for the power supply and/or to the means for switching and control and/or to parts of the electric drive Thanks to the cover on the handle, during servicing there is no need for the entire 10 housing of the hand-held machine tool to be dismantled and rapid access can be gained to carbon brushes or cables, for example, with little assembly effort.

Advantageous developments of the invention are revealed by 15 the subclaims.

Access to the electrical components in the housing of the hand-held machine tool is particularly rapid and achievable with very little assembly effort if the cover is swivel 20 mounted on the handle of the housing and one or more fastenings, by means of which the cover can be connected to the housing to close the opening, are provided on the cover and/or housing. On its inner side, the cover can have fixing elements and/or holding devices for components 25 disposed behind the opening in the handle.

Advantageously, that area of the handle that serves as a palm support is designed as a cover.

30 It is especially assembly-friendly if the one or more fastenings consist of one or more captive screws retained on the cover or housing.

The cover can be swivel-mounted on an axis disposed at the 35 lower end of the handle. Likewise, however, the swivel axis can also be located in the upper region of the housing.

In the handle at its lower end, a cable sleeve is usually employed as a bushing for a mains cable. The swivel axis for the cover can then be disposed in front of or behind the cable sleeve, where the cable sleeve is attached in the 5 handle outside the cover or a fixing is provided for the cable sleeve in the hinged cover.

Drawing 10 The invention is explained in further detail below with the aid of several exemplary embodiments illustrated in the drawing, in which: Figure 1 shows a partial longitudinal section through a hand-held machine tool with a hinged cover on the 15 handle and a fixing screw for the cover orientated perpendicularly to the drive axis, Figure 2 shows a partial longitudinal section through a hand-held machine tool with a hinged cover and a fixing screw for the cover orientated parallel to 20 the drive axis, Figure 3 shows a partial longitudinal section through a hand-held machine tool, wherein a cable sleeve is attached to the hinged cover, Figure 4 shows a partial longitudinal section through a 25 hand- held machine tool with a hinged cover on the handle, wherein a cable sleeve is attached in the handle. Description of exemplary embodiments

Figure 1 shows a longitudinal section through a section of a hand-held machine tool 1, which is a hammer drill or impact drill, for example. However, the invention described below is not limited to such types of hand-held machine 35 tools, but can also be applied, for example, to handheld grinders, electric hand saws and the like. In the section illustrated in Figure 1, a housing 3, onto which a handle 5

is integrally moulded, can be seen enclosing the machine.

The handle 5 forms a locating space, for example for a mains cable 7, and on-off switch 9 and possibly an electronic control unit, not specially identified, for the 5 drive of the hand-held machine tool. An electric motor 11 with a brush plate 13 extending into the space of the handle 5, is installed in the area of the handle 5 in the upper part of the housing 3.

10 The rear of the handle 5, that is to say that area on which the inside of the palm rests when the hand-held machine tool is operated, is provided with an opening 15 of such a size that, with the cover open, access is possible to the electrical components 7, 9, 13 in the handle 5.

At the lower end of the handle 5 is located a hinge 19, whose swivel axis is arranged so that the cover 17 supported at this hinge, as is shown in two positions of the cover 17 in Figure 1, can be folded out at the lower 20 end of the handle 5. A captive screw 21, which can be screwed into the housing 3 when the cover 17 is closed, is inserted at the end of the cover 17 opposite to the hinge 19. In this exemplary embodiment, the captive screw 21 is orientated perpendicularly to the drive axis 23 of the 25 hand-held machine tool. If necessary, several fastenings can also be provided for the cover 17. As already described, the individual fastening can consist of a captive screw 21 or a bayonet fastener, for example. In principle, any type of fastening means can be used which 30 allow rapid opening and secure closing of the cover 17.

Fixing elements and/or holding devices 25, which with the cover 17 closed, retain components, for example the brush plate 23, in the housing, can be integrally moulded on the 35 inside of the cover 17. A holding device 27, which grips and thus locks the mains cable 7 entering the handle 5 through a sleeve 29, is also integrally moulded at the

lower end of the cover 17 at the inner side. The cable sleeve 29 forming anti-kink protection for the mains cable 7 is inserted into the lower end of the handle 5 and is not displaced when the cover 17 is pivoted.

The exemplary embodiment of a hand-held machine tool illustrated in Figure 2, with a cover 17 pivoted on the handle 5, differs from the exemplary embodiment illustrated in Figure 1 only by the attachment of the cover 17 to the 10 housing 3. In the closed state of the cover 17, the latter is joined to the housing 3 by means of a captive screw 31 inserted at the upper end of the cover 17, and orientated parallel to the drive axis 23 of the hand-held machine tool. In this type of attachment of the cover 17 to the 15 housing 3, a higher tensile force is produced on the cover 17, so that the holding devices 25, 27 integrally moulded therein exert a relatively high locating force on the components in the handle 5. A screw that is orientated obliquely to the drive axis 3 and then produces a tensile 20 force both in the direction of the drive axis and transversely thereto, can also be used for the attachment of the cover 17 to the housing 3.

The exemplary embodiment of a hand-held machine tool 25 illustrated in figure 3, differs from the exemplary embodiment illustrated in Figure 1 and Figure 2, respectively, by the arrangement of the hinge 19 for the cover 17 and the fixing of the cable sleeve 29 for the mains cable 7. Whereas in the exemplary embodiment in 30 Figure 1 and Figure 2, respectively, the hinge 19 is disposed at the rear side of the handle 5, and the cable sleeve 29 is fixed in the non-moving housing part of the handle 5, according to Figure 3, the hinge 19 lies on the inner side of the handle 5 and the cable sleeve 29 is fixed 35 in the hinged cover 17. This means that the mains cable 7 is tilted when the cover 17 is pivoted. In this case, in order to hold the mains cable 7 more securely, a cable grip

33 is provided in the stationary part of the handle 5 above the outlet point of the cable sleeve 29.

In the exemplary embodiment of a hand-held machine tool 5 illustrated in Figure 4, the hinge 19 for the cover 17 is likewise disposed at the inner side of the handle 5. Of course the cable sleeve 29 for the mains cable 7 is not attached to the hinged cover 17, but is retained by a separate fixing element 35 at the stationary housing part lO of the handle 5.

In the embodiments of the hinged cover 17 illustrated in Figures 1 to 4 and described above, the pivot axis for the cover 17 can be placed inside or outside the housing by 15 means of a link guide. All exemplary embodiments show that the pivot axis for the cover 17 lies at the lower end of the handle 5. However, the hinge for the cover 17 can also be placed in the upper area of the housing 3; at that point in the illustrated exemplary embodiments where the fixing 20 screw 21 and 31, respectively, is located. The captive attachment means for the cover 17 would then have to be provided at the lower end of the handle 5.

With simple means, the handle 9 of the hand-held machine 25 tool 1 can be given vibration-damping characteristics by inserting one or more spring elements in the seating between the cover 17 and the housing 3. Thus, for example, the screw 31 illustrated in Figure 2 and aligned parallel to the drive axis 23 can be a shoulder screw with a spring 30 element (for example a coil spring, rubber element, etc.) inserted between cover 17 and housing 3.

Claims

01.02.01 Ti/Bc ROBERT BOSCH GMBH, 70442 Stuttgart Claims 1. Hand-held

machine tool with a handle (5) integrally moulded onto its housing (3), which handle forms a 10 space for accommodating electrical components, preferably means (7) for the power supply and/or means (9) for switching and controlling an electric drive (11) located in the housing (3), characterized in that the handle (5) has an opening (15) that can be closed 15 by means of a cover (17), which opening facilitates access to the means (7) for the power supply and/or to the means (9) for switching and control and/or to parts (13) of the electric drive (11).

20
2. Hand-held machine tool according to Claim 1, characterized in that the cover (17) is swivel-mounted on the handle (5) of the housing (3) and that one or more fastenings (21, 31), by means of which the cover (17) can be connected to the housing (3) to close the 25 opening (15), are provided on the cover (17) and/or housing (3).
3. Hand-held machine tool according to Claim 1 or 2, characterized in that on its inner side, the cover 30 (17) has fixing elements and/or holding devices (25, 27) for components (7, 9, 13) disposed behind the opening (15) in the handle (5).
4. Hand-held machine tool according to one of the 35 preceding Claims, characterized in that, that area of the handle (5) that serves as a palm support is designed as a cover (17).
5. Hand-held machine tool according to Claim 2, characterized in that the fastening or fastenings consist of one or more captive screws (21, 31) retained on the cover (17) or housing (3).
6. Hand-held machine tool according to one of the preceding Claims, characterized in that the cover (17) is swivel-mounted on an axis (19) disposed at the lower end of the handle (5).
7. Hand-held machine tool according to Claim 6, characterized in that in the handle (5) at its lower end, a cable sleeve (29) is employed as a bushing for a mains cable (7), and that the swivel axis (19) for IS the cover (17) is disposed in front of or behind the cable sleeve (29), wherein the cable sleeve (29) is attached in the handle (5) outside the cover (17).

S. Hand-held machine tool according to Claim 6, 20 characterized in that in the handle (5) at its lower end, a cable sleeve (29) is employed as a bushing for a mains cable (7), and that the swivel axis (19) for the cover (17) is disposed in front of or behind the cable sleeve (29), wherein the cable sleeve (29) is 25 attached in the hinged cover (17).

9 A hand-held machine tool as substantially described herein with reference to the accompanying drawings.