JPH10217152A - Hand hold type machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand hold type machine tool which can be handled easily and in which the vibrations in operation are damped effectively. SOLUTION: Between a grip 13 and a shell 25, a first mounting part 30 is provided which guarantees a coupling with substantially no play in the pressing direction 21, while a second mounting part 31 having a certain margin for play to make movement in the pressing direction 21 is installed between the grip 13 and shell 25, and further between them at least one damping member 40 is interposed, which energizes the shell 25 toward a stopper 38 furnished on the grip 13 through utilization of a preload so that it is forced to move in the direction of going apart from the grip.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand-held machine tool, comprising a machine casing, a grip connected to the machine casing, and an outer shell member which covers a back portion of the grip and is used by a user as a pressing surface. And the shell is connected to the handle or the machine casing at at least two points of attachment.

[0002]

2. Description of the Related Art A hand-held machine tool having a handle and having an outer shell member used as a pressing surface by a user on the back of the handle is already known (DE-A-195 38 252). book). The outer shell member has an engagement protrusion on an outer edge thereof, the engagement protrusion engaging a corresponding receiving groove in the grip. In addition, the shell is screwed or tightened to the handle. In any case, the outer shell member and the grip are connected without play. It is not permitted to operate a hand-held machine tool without a shell. This is because, only by the outer shell member, the grip is protected from intrusion of dust and water. In the case of this known format,
Vibrations that occur during operation of a hand-held machine tool cannot be effectively attenuated.

[0003] Furthermore, in the case of a hammer drill known from DE-A 41 24 574, a grip is attached to the machine housing via a swivel joint. In addition to the swivel, the grip is connected to the machine casing via a spring device. This type of connection, however, makes handling of the hammer drill difficult because the spring travel between the handle and the machine casing is limited only via the spring device.

[0004]

SUMMARY OF THE INVENTION The present invention provides a hand-held machine tool in which vibration during operation is effectively attenuated and which is easy to handle.

[0005]

This problem has been solved by the following method. That is, a first attachment point is provided between the grip and the outer shell member, which ensures a substantially playless connection in the pressing direction, and between the grip and the outer shell member for movement in the pressing direction. A second attachment point where room for play is left, and further, at least one damping member is inserted between the grip and the outer shell member, and the damping member receives a preload, The outer shell member is forced in the direction of the stopper provided in the grip and in the direction in which the outer shell member can be released from the grip.

[0006]

The advantages of the present invention are that, at the same time as effective shock absorption is obtained, good handleability of the hand-held machine tool is guaranteed, and even if the outer shell member is removed, the hand-held machine tool can be used. It can function without hindrance.

[0007] Further advantageous configurations and improvements of the hand-held machine tool according to the invention are possible by means of the measures recited in the claims.

[0008]

1 shows a hand-held machine tool 10 according to the present invention.
The rear part of is shown. The hand-held machine tool 10
It has a machine casing 11, which includes
In particular, the drive motor 12 is housed. In a known manner, a handle 13, which is also composed of two outer shells, is integrally formed in a machine housing 11 which is composed of two outer shells. A switch 14 is disposed in the grip 13, and the drive motor 12 can be controlled by operating the switch 14 via a push button 15.
At the free end 18 of the grip 13, a reinforcing sleeve 19 for the power supply cable is mounted. The grip 13 has a known pistol grip-like shape, and this shape allows the user to apply a pressing force in the feed direction of the tool. In the case of the illustrated embodiment, the hand-held machine tool 10 is a percussion drilling machine, that is, a drill hammer. In this drill hammer, the feed of the drill is performed in the longitudinal direction of the drill. No.

[0009] The serving surface for the user is mainly the casing wall of the back 24 of the grip 13.
This back part 24 of the grip 13 is covered with an outer shell member 25. The outer shell 25 comprises a rigid base 26, which has a soft overlay 27 in the area of the pressing surface.

[0010] The outer shell member 25 is attached to attachment points 30, 31.
To the machine casing 11 or the grip 13. The first attachment point 30 is provided in the area of the free end 18 of the grip 13. Between the grip 13 and the outer shell member 25,
A snap connection is provided. This snap connection comprises a spring-acting tongue 32 integrally formed with the base 26. At the mounting position of the outer shell member 25, the locking hook 33 is locked by a protrusion 34 provided on the casing of the grip 13.

A second attachment point 31 is provided at the machine end of the handle 13 in the area of the extension to the machine casing 11. A lug 36 projecting from the outer shell member 25 in a direction transverse to the pressing direction is useful for the attachment. The lugs 36 engage correspondingly laterally extending receiving openings 37 of the machine casing 11. The lug 36 is then applied to the inside of the overhang 38 of the machine casing 11 which serves as a stop for the lug.

This particular type of mounting of the shell 25 allows a substantially play-free connection of the shell 25 and the grip 13 in the pressing direction (arrow 21) at the first mounting point 30. At the second attachment point 31, there is a clear play for movement in the pressing direction (arrow 21), since the receiving opening 37 is clearly wider than the lug 36. On the other hand, the outer shell member 25 is
Can be swiveled within the limits, so that the lugs 36 can be pressed, when pressed in the arrow direction 21, against a stop at the machine casing 11 opposite the overhang 38.

Vibration is transmitted to the grip 13 during operation based on the striking action of the hand-held machine tool 10. Outer shell member 2
A damping member 40 is interposed between 5 and the machine casing 11 in order to reduce vibration acting on the user.
A support surface 41 is formed on the outer shell member 25, and the support surface is in close contact with the damping member 40. The damping member 40
Corresponding contact surfaces 42 support the machine casing 11. The damping member 40 is made of a material having a buffer action, for example, a soft rubber.

FIG. 2 shows the outer shell member 25 detached from the grip 13. The grip 13 can be fully functioned without the outer shell member 25 and consists of two casing shells in the usual manner for a hand-held machine tool. These two casing shells are divided in a substantially longitudinal plane of the hand-held machine tool 10. In the form shown in FIG. 2, the hand-held machine tool 10 can be operated in the same manner as a conventional hand-held machine tool in which a special damping measure is not provided at the grip 13. In the area of the grip 13, a recess 43 for the damping member 40, which is open rearward, and a notch 44 for the stiffening rib 45 provided on the outer shell member 25.
And a receiving opening 37 provided in the second mounting point 31
And the protruding portion 34 provided at the first attachment point 30 are visible from the outside.

A damping member 40 is fitted into the recess 43 to effectively cushion the grip 13. For this purpose, both casing shells of the machine casing 11 must be separated and a damping element 40 must be inserted between them. After the two casing shells have been spliced together, the damping member 40 will be retained in positive engagement in the grip 13 and the machine casing 11 via the edge 40a.
To attach the shell member 25, the lug 36 is first inserted into the receiving opening 37 and then the end on the side of the first attachment point 30 is pressed against the grip 13 so that the
2 flexes elastically at the projection 34, and finally the hook 33 can be locked behind the projection 34. The outer shell member 25 is now additionally attached to the hand-held machine tool 10 without any tools, and occupies the rest position shown in FIG. 3 with no pressing force applied in the direction of the arrow 48. There is a play s in the area of the second attachment point 31 between the outer shell 25 and the contours 11a, 25a of the machine casing 11, shown by broken lines, because they are not visible from the outside. In that case, a damping member 40 is interposed between the machine casing 11 and the outer shell member 25, whereby the outer shell member 25
Is pressed by the preload in the direction away from the grip 13 toward the stopper 38 provided on the machine casing 11. For this reason, play is limited to the maximum value s. The outer shell member 25 can be removed by, for example, opening the mechanical casing 11 composed of two outer shells. This is because, in that case, the locking hook 33 can move laterally at the protrusion 34. However, it is also conceivable to provide an opening in the handle of the handle, through which the tongue 32 can be pushed back in the direction of disengagement at the projection 34.

FIG. 4 shows the hand-held machine tool 10 in a working state. In this case, a pressing force is applied to the outer shell member 25 by the user. The damping member 40 is thereby elastically deformed by at most play s. Outer shell member 25
In this case, at least the lug 36 contacts the machine casing 11.

[Brief description of the drawings]

FIG. 1 is a sectional view of a grip portion of a hand-held machine tool.

FIG. 2 is a side view of a grip portion with a damping member removed.

FIG. 3 shows the damping member in an unpressed state;
It is a side view of the grip part at the time of non-use.

FIG. 4 is a side view of the grip portion of FIG. 3 shown with the damping member pressed in use.

[Explanation of symbols]

10 hand-held machine tool, 11 machine casing,
12 drive motor, 13 grip, 14 switch,
15 push button, 18 free end of grip, 19 stiffening sleeve, 21 pressing direction, 24 back part, 25
Outer shell member, 26 base, 27 overlay, 30
First attachment point, 31 Second attachment point, 32
Tongue, 33 locking hook, 34 protrusion, 36
Lug, 37 receiving opening, 38 overhang (stopper), 40 damping member, 41 support surface, 42 contact surface, 43 recess, 43 notch

Claims (9)

[Claims] 1. A hand-held machine tool, comprising: a machine casing (11); a grip (13) coupled to the machine casing (11); An outer shell member (25) used as a pressing surface, and the outer shell member (25) has at least 2
In the form of being connected to the grip (13) or the machine casing (30, 31) at two mounting points (30, 31), the pressing direction () between the grip (13) and the outer shell member (25); 21) is provided with a first attachment point (30) which ensures a virtually playless connection, and between the grip (13) and the outer shell member (25) in the pressing direction (21) in the direction of movement. At the second mounting point (3
1), and at least one damping member (4) between the grip (13) and the shell (25).
0) is interposed, and the damping member is forced by the preload to push the outer shell member (25) in the direction of the stopper (38) provided in the grip (13) and in the direction in which the outer shell member (25) can be released from the grip. A hand-held machine tool characterized in that: 2. An outer shell member (25) comprising: a rigid base (2);
6. The hand-held machine tool according to claim 1, comprising: (6) a soft overlay covering the pressing surface. 3. The hand-held device according to claim 1, wherein the outer shell member (25) is selectively removably arranged on a rear wall (24) of the machine casing (11). Machine Tools. 4. A first attachment point (30) is formed by a tongue (32) projecting from the outer shell member (25), at which a hook (33) is formed. 4. The locking hook according to claim 1, wherein the hook hooks behind a projection (34) provided on the grip (13) at the position where the outer shell member (25) is assembled. 5. Hand-held machine tool. 5. The second mounting point (31) is formed by a lug (36) projecting from the outer shell member (25), which lug engages a receiving opening (37) in the machine casing (11). The hand-held machine tool according to any one of claims 1 to 4, which is in conformity with each other. 6. The receiving opening (37) and the lug (36) are provided in a direction transverse to the pressing direction, and the receiving opening (37) is wider than the lug (36) in the pressing direction. The hand-held machine tool according to claim 5, wherein 7. An outer shell member (25) having a support surface (41) formed thereon, said support surface being supported at a damping member (40). The hand-held machine tool described in the item. 8. The machine casing (11) is formed from two casing shells which are divided in the longitudinal direction of the hand-held machine tool. The casing shell is opened and the damping member (40) is removed. Recess (43) in (11)
The hand-held machine tool according to any one of claims 1 to 7, wherein the machine tool can be fitted into the hand-held machine tool. 9. The hand-held machine tool according to claim 1, wherein the outer shell member has at least one stiffening rib.