CN1227098C - Electric hand tool machine - Google Patents

Abstract

The invention relates to an electric hand-operated machine tool comprising a device for accommodating a power cable (2) on an assembly shell (1) of a housing of an electric appliance, especially of an angle grinder that is provided, in particular, with a shell-type design. The assembly shell (1) has a first opening (11) through which the power cable (2) is guided and has a labyrinth-shaped fixing device (12) which is provided for the power cable (2) and which is arranged in the vicinity of the first opening (11). The electric hand-operated machine tool can be produced more economically and can be assembled more easily by virtue of the fact that the assembly shell (1) has a first rib (13) which is located between the first opening (11) and the fixing device (12), is aligned with the first opening (11) or is parallel to this alignment and which serves to guide the power cable (2). In addition, the assembly shell is provided with a second rib (14) which is arranged between the fixing device (12) and the first rib (13) in the path of the power cable (2) provided by the first rib (13). Furthermore, the invention also relates to a housing for the electric hand-operated machine tool having an assembly shell (1) as above described and an envelope housing (3). The envelope housing (3) has clamp rib (32, 33, 34) facing to the fixing device (12) and claming the power cable (2) after installation.

Description

Electric hand tool machine

technical field

The invention relates to an electric hand-held tool machine, in particular to a hand-held grinder with a curved handle.

Background technique

Such a solution is known for jigsaws, the housing of which is formed in a shell-like construction from a mounting shell and a cover shell. The power cord is housed in the housing in such a way that it acts as a tension reliever. In this case, the supply line is guided through an opening into the housing and is held there by means of a pressure plate and labyrinth spacers, which clamp the supply line and through which the supply line is guided in a serpentine manner . These devices are housed in the assembly case. Clamping ribs located opposite the labyrinth spacer are arranged in the cover shell connected to the assembly shell, and they hold the power cord in the labyrinth spacer so that it cannot accidentally slip out therefrom. In this way, it is impossible to cause the jigsaw to malfunction due to pulling on the power cord to pull it out of the housing, which would constitute a source of danger due to the exposure of the wires. However, this does not rule out the possibility of the power cord being pushed into the case. This is of course undesirable as that could break the power lead and short circuit it. Furthermore, additional screws have to be used for fixing the conductors by means of the pressure plate, which leads to increased assembly work and thus to increased costs.

Contents of the invention

The object of the present invention is to provide a hand power tool, the power cord of which can be securely clamped in the housing and which is relatively simple to assemble.

According to the invention, an electric hand-held power tool is proposed, which has a housing with a device for accommodating the power cord on a mounting shell, wherein the mounting shell has a hole for passing the power cord The first opening and a labyrinth fixing device for the power cord arranged around the first opening, wherein the assembly shell has a first rib between the first opening and the fixing device, which is arranged in the first opening in a line or parallel thereto for guiding the power cord; and having a second rib disposed between the fixing device and the first rib on the path of the power cord predetermined by the first rib; Arrange a first locking device between the first rib and the second rib and/or arrange a second locking device between the fixing device and the second rib, so that the clear width between the respective two components is smaller than the power cord diameter of.

The advantage of the present invention is that the hand-held grinder with curved handle is relatively simple to assemble, and thus the production cost is low.

The first rib is arranged on the straight line of the first opening, or parallel to the straight line, through which the power cord is guided along the first rib. Since a second rib is arranged between the fastening device and the first rib in the path of the power supply line predetermined by the first rib, the power supply line bears against this second rib and is deflected in its direction by it. In this way, the power cord is prevented from being pushed into the housing from the outside. Thus, the problem of the power cord being pushed so far into the housing that it bends and causes a short circuit does not arise. This avoids having to perform maintenance on the power tool as a result. This configuration of the first rib and the second rib in combination with the known labyrinth fastening ensures a simpler assembly than hitherto. That is to say, it is not necessary to fix the supply line in the region of its entry into the housing by means of a pressure plate. In this way, the additional use of a fastening device, for example on the mounting shell, and the additional use of screws are also no longer mandatory. Through the cooperation of the first and second ribs, the power cord is accommodated in an S-shape in the opening region of the housing, and incorrect placement of the power cord is prevented.

It is advantageous if it is possible to arrange the power cord between the first rib, the second rib and the fixing device in only one way. This is achieved in that between the first and the second rib and between the second rib and the fastening device, a locking device is arranged in each case, so that the respective clear width between these components is smaller than the diameter of the supply line.

It is further advantageous if the first rib has two parallel rib sections, between which the power supply lines can be guided. This ensures reliable guidance of the power supply line, since not only a deviation of the power supply line in the direction of the first rib part, but also in the direction of the second rib part is avoided.

A further advantage is achieved in that the second rib is arranged in line with the first opening, exactly on the center line between the two rib parts of the first rib. Optimum protection of the power cord from being pushed into the housing is thereby ensured, since the second rib is struck by the power cord onto its center by being guided by the first rib.

Furthermore, it is advantageous if the second rib is arranged at a distance from the first rib which is smaller than the diameter of the supply line. It is particularly advantageous here if the clear width between the first rib and the second rib is approximately equal to the diameter of the supply line. This achieves that the supply line is not only fixed in its position in the mounting housing 1 by means of the labyrinth fixing device, but also is additionally fixed between the first rib and the second rib.

It is further advantageous if the device has a fastening device for the pressure plate. In this way, there is an additional possibility that the specifications of electric tools in different countries and regions can be adapted respectively, that is, wires of different thicknesses can be used.

In an advantageous manner, the fastening device is connected directly to the first rib, wherein it can be formed integrally therewith, for example. This leads to better mechanical stability of the individual components.

It is further advantageous if the cover shell of the housing, which is connected to the mounting shell, has clamping ribs which are located opposite the fastening means of the mounting shell when the housing is in the assembled state. In this way, the power cord is reliably clamped in the labyrinth fixing device and cannot slip out of it.

Description of drawings

In the following description, the invention is explained in greater detail with the aid of an exemplary embodiment depicted in the drawing. The picture shows:

Figure 1 is a partial perspective view of an assembled shell,

Figure 2 is a partially enlarged top view taken from Figure 1,

FIG. 3 is a top view of a part of the assembly housing shown in FIG. 1 with an inserted power cord,

Figure 4 is a partial perspective view of a closure shell, and

Figure 5 is a partial sectional view through the assembled housing.

Detailed ways

FIG. 1 shows the inner surface area of a mounting housing 1 of an angle handle hand grinder, in which a power supply line 2 (see FIG. 3 ) enters the housing of the angle handle hand grinder. The shell of the curved handle hand grinder is composed of an assembly shell 1 and a cover shell 3 in a shell structure (see FIG. 4 ).

The assembly shell 1 has a first opening 11 . In direct proximity to it, in line with the first opening 11 , a fastening device 16 is attached. Attached to the fastening device 16 is a first rib 13 which is formed integrally with the fastening device. The first rib 13 is composed of a first rib section 13a and a second rib section 13b oriented parallel thereto. The two rib portions 13 a , 13 b are arranged along the straight line of the opening 11 . The second rib 14 is arranged at a distance from the first rib 13 . The second rib 14 is oriented parallel to the aforementioned two rib portions 13a, 13b. The second rib 14 is arranged such that it extends on the center line between the two rib portions 13a, 13b. The second rib 14 is connected to the second rib section 13 b of the first rib 13 via a first bearing surface 17 . The bearing surface 17 extends in a horizontal plane which is below the horizontal plane formed by the fastening device 16 , the first rib 13 and the second rib 14 . Arranged between the first rib 13 and the second rib 14 is a first locking device 14a which is formed integrally with the second rib 14 and rises on the inner side of the mounting shell 1 up to the end of the second rib 14. in the horizontal plane. Its function is to reduce the clear width between the first rib 13 and the second rib 14 . Furthermore, a labyrinth-like fastening device 12 is arranged on the inner side of the mounting shell 1 . It has a first stop 12a and a third stop 12c aligned parallel thereto. The two stops 12 a , 12 c are oriented perpendicular to the second rib 14 . A second fastening structure 12b is arranged between the first fastening structure 12a and the third fastening structure 12c. The second fixing structure 12b is formed in a cross shape. The three fastening structures 12 a - 12 c of the fastening device 12 are connected to one another via a second bearing surface 18 . This second bearing surface 18 is arranged in the same horizontal plane as the first bearing surface 17, that is to say below the horizontal plane formed by the three fastening structures 12a-12c. This level coincides with the level on which the first rib 13 and the second rib 14 are placed. Arranged between the second rib 14 and the second fastening structure 12b is a second locking device 12d which is formed integrally with the second fastening structure 12b and stands erect on the inner side of the mounting shell 1 up to the second fastening structure. In the horizontal plane of the structure 12b. Its effect is to reduce the clear width between the second rib 14 and the fixing structure 12 .

The other elements shown in FIG. 1 are screw caps, ventilation slots and reinforcement ribs. However, these elements are not essential to the invention and are known in the assembly housing 1 of the angle handle hand grinder, so they are not described in detail here.

Through the enlarged part shown in FIG. 2, the relationship between the above-mentioned features is more clear. Wherein, the same components are marked with the same reference numerals.

FIG. 3 shows the assembly housing 1 shown in FIGS. 1 and 2 with the power supply cable 2 inserted. The power supply cable 2 has an inner section 22 which is arranged in the assembly housing 1 and an outer section 23 which is arranged outside the assembly casing 1 . The power cord 2 enters the assembly case 1 through the first opening 11 . The diameter 21 is so large that the supply line 2 lies in the fastening device 16 almost without play.

The supply line 2 is guided through the two rib parts 13a, 13b of the first rib 13 in such a way that it can only move a small distance between the two rib parts 13a, 13b. Since the first locking device 14a is arranged between the first rib part 13a and the second rib 14, the clear width between the first rib part 13a and the second rib 14 is reduced so much that it is smaller than the power cord 2. diameter 21. This makes it impossible for the power cord 2 to be placed between the first rib portion 13 a and the second rib 14 . There is thus only one possibility, namely, to place the inner section 22 of the power cord between the second rib portion 13 b and the second rib 14 . The distance between these two components is just so great that the supply line 2 can be placed between them without play.

By means of the second locking device 12d, the clear width between the second rib 14 and the second fastening structure 12b is reduced so much that the supply line 2 cannot be inserted between the second rib 14 and the second fastening structure 12b, The power cord 2 has to be guided by the fastening device 12 forcibly. Here, it is inserted in a serpentine manner between the three fixing structures 12a-12c. In the inserted state shown in the figures, the inner section 22 of the power supply cord 2 rests on the first support surface 17 between the second rib part 13b and the second rib 14 (Figs. 1 and 2), and at the same time The fastening device 12 rests internally on a second support surface 18 (see FIGS. 1 and 2 ). The level on which both the first support surface 17 and the second support surface 18 are placed is located so far below the level on which the first rib 13, the second rib 14 and the fastening device 12 are formed that the supply line 2 is at these positions ends substantially in alignment with the horizontal plane of the two ribs 13 , 14 and the fixing means 12 .

By means of the two locking devices 12d and 14a, it is impossible for the supply line 2 to be placed incorrectly. This simplifies assembly and enables even unskilled workers to perform the work. Since the power supply line 2 deviates through the second rib 14 in the direction predetermined by the first rib 13 acting as a guide, between the two rib parts 13a, 13b of the first rib 13 and the second rib part 13 of the fixing device 12 An S-shape emerges in the region between a fastening structure 12a. This S-shaped arc which abuts against the second rib 14 ensures that the supply line 2 is prevented from being pushed into the interior of the housing. This effect can also be improved by screwing a pressure plate to the fastening device 16 . If the pressure plate is screwed sufficiently securely, it additionally fixes the power supply line 2 in its position relative to the mounting housing 1 in this region.

FIG. 4 shows a cover shell 3 of the housing of the angle handle hand grinder in a perspective view. This view is chosen such that the closure shell 3 can be placed on the assembly shell 1 shown in FIG. 1 by being turned upwards, and one obtains the assembled state of the shell in this way. The cover shell 3 has a second opening 31 through which the power supply line 2 (see FIG. 5 ) can be guided into the interior of the housing. Inside the cover case 3, a first clamping rib 32, a second clamping rib 33, and a third clamping rib 34 extend upward from the inner surface thereof. They are positioned in such a way that when the housing is in the assembled state they lie opposite the fastening means 12 (see FIG. 5 ). The three clamping ribs 32 - 34 protrude so far above the inner surface of the closure shell 3 that they essentially end flush with the plane formed by their edges.

Further arrangements can also be seen in FIG. 4 , which have no inventive significance and are therefore not described in detail. Here, as in FIG. 1 , these are also screw covers, ventilation slots and stiffeners.

FIG. 5 shows an assembled casing, wherein the assembly casing 1 and the cover casing 3 are butted together. Here, the power cord 2 is placed in the housing and enters it through two openings 11 , 31 . For the sake of clarity, only the outer section 23 is shown for the power cord 2 . It can be clearly seen that the three clamping ribs 32 - 34 of the cover shell 3 are located opposite the fixing means 12 of the assembly shell 1 . Here, the three clamping ribs 32 - 34 are arranged on the cover shell 3 in such a way that in the assembled state they lie in recesses relative to the three fastening structures 12 a - 12 c of the fastening device 12 . In this case, the end levels of the three clamping ribs 32 - 34 are inserted into the end level of the fastening device 12 , so that there is a small overlapping area formed by the three clamping ribs 32 - 34 and the fastening device 12 . Through this overlapping, combined with the position of the ribs described above, in addition to the maze effect in the horizontal direction, another vertical maze effect is additionally produced. The inner section 22 of the supply cord 2 terminates substantially flush with the termination level of the fixture 12 as described in the description for FIG. 3 . By the overlapping of the three clamping ribs 32 - 34 with the fastening device 12 , the inner section 22 of the power cord 2 is firmly pressed onto the two support surfaces 17 , 18 (see FIGS. 1 and 2 ). In this way, a clamping of the inner section 22 of the supply cord 2 is formed, which allows the supply cord 2 to be fixed simply and reliably in the housing of the angle handle hand grinder.

Claims (13)

1. An electric hand-held power tool, having a housing with a device for accommodating a power cord (2) on one of its assembly shells (1), wherein the assembly shell (1) has a device for passing through A first opening (11) through the power cord (2) and a labyrinth fixing device (12) for the power cord (2) arranged around the first opening (11), characterized by: The assembly shell (1) has a first rib (13) between the first opening (11) and the fixing device (12), which is arranged on the line of the first opening (11) or parallel thereto, for the guide of the power cord (2); and has a second rib (14), which is placed between the fixing means (12) and the first rib (13), predetermined by the first rib (13), the power on the path of the line (2); between the first rib (13) and the second rib (14) a first locking device (14a) and/or between the fixing device (12) and the second rib (14) A second locking device (12d) is arranged between them, so that the clear width between the corresponding two members is smaller than the diameter of the power cord (2). 2. The hand power tool as claimed in claim 1, characterized in that the first rib (13) has two parallel rib sections (13a, 13b) between which the power supply line (2) can be guided. 3. The hand-held power tool according to claim 2, characterized in that: the second rib (14) is arranged on the straight line of the first opening (11), just at the two rib parts of the first rib (13) ( 13a, 13b) between the center line. 4. Hand tool machine according to one of the preceding claims, characterized in that the second rib (14) is arranged at a distance (15) from the first rib (13) which is approximately equal to the power supply line (2) diameter (21). 5. The hand power tool as claimed in one of claims 1 to 3, characterized in that the second rib (14) is oriented perpendicularly to the fastening device (12). 6. The hand power tool as claimed in one of claims 1 to 3, characterized in that it has a fastening device (16) for the pressure plate. 7. The hand power tool as claimed in claim 6, characterized in that the fastening device (16) is connected directly to the first rib (13). 8. The hand power tool as claimed in one of claims 1 to 3, comprising a mounting shell (1) and a cover shell (3), the cover shell (3) having clamping ribs (32, 33, 34) , these clamping ribs (32, 33, 34) are positioned opposite the fixing device (12) when the housing is in an assembled state and are used to clamp the power cord (2). 9. The hand-held power tool according to claim 1, characterized in that the hand-held power tool is a curved handle hand-held grinder. 10. The hand-held power tool according to claim 1, characterized in that the housing is formed as a shell. 11. The hand power tool according to claim 4, characterized in that the distance is smaller than the diameter (21) of the power supply line (2). 12. The hand power tool as claimed in claim 6, characterized in that the fastening device (16) is arranged between the first opening (11) and the first rib (13). 13. The hand power tool as claimed in claim 7, characterized in that the fastening device (16) is formed integrally with the first rib (13).

Images