JP2002219669A - Drill - chisel hammer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drill - chisel hammer saving a space. SOLUTION: This drill - chisel hammer is provided with a drive motor disposed in a casing 10 and can drive an insertion tool disposed in a tool retainer body by a drive motor via driving mechanism. The drill - chisel hammer is provided with an overrun clutch 16, and the overrun clutch 16 is interposed between the drive motor and an output shaft 12 in a power flowing passage of a rotation drive by a lock element 18. The output shaft 12 can be released from the connection with the drive motor in the driving force by a switch 14 and fixable in the rotary direction and the overrun clutch 16 is incorporated in the switch 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill-chisel hammer having a drive motor disposed on a casing, and the drive motor hits an insertion tool disposed on a tool holder. The drill-chisel hammer is provided with an overrun clutch, and the overrun clutch is a power flow path of rotary drive by a locking element, and is driven by a drive motor. And a type interposed between the output shaft.

[0002]

2. Description of the Prior Art A safety clutch which is released as soon as a drill is locked, in order to prevent the drill hammer held by the user from continuing to rotate uncontrollably when the drill or cutter is locked to a wall. It is known to connect a drill or cutter with a drive of a drill hammer via a rotary shaft.

A hand-held machine tool having a safety clutch of this type is disclosed in German Patent 38 38 322.
No. 02 is known. The safety clutch includes a first clutch portion radially inward for transmitting torque;
A second clutch portion surrounding the first clutch portion. These clutch parts are connected to one another via locking elements formed as rollers. The roller is guided in a guide passage in the first clutch part. Springs are arranged in the guide passages, the springs being supported at a first end on the passage bottom,
At the second end, the roller acts radially outward toward the second clutch portion, pressing the roller into a notch in the second clutch portion. When the predetermined torque is exceeded, the roller is pressed radially inward from the notch against the spring force, and the safety clutch is released. The roller is then slid past the notch.

[0004]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to improve a drill-chisel hammer of the type mentioned at the outset to provide a space-saving one.

[0005]

According to the device of the present invention, the output shaft can be disengaged from the drive motor by a switch and can be fixed in the rotational direction. Yes, an overrun clutch is built into the switch.

[0006]

According to the structure of the present invention, the components of the overrun clutch and the switch can be used in common, whereby the components, the configuration space, and the weight can be reduced. . Overall, good operability or improved comfort for the user is obtained.

[0007] A compact and simple construction is achieved if the switch sleeve of the switch is operatively connected to the output shaft via a locking element, especially if the locking element is arranged radially inside the switch sleeve. This advantageously saves construction space. The construction space of the switch sleeve is available, and the locking element can be provided in an advantageous manner surrounded by the switch sleeve.

If the locking element is engaged in a notch with a positive connection radially inward as viewed in the rotational direction, and the locking element is covered by a ring groove, the plurality of locking elements can be connected by only one spring element. The load can be applied toward the locking position. The installation can be simplified and the individual springs which load the components, for example the locking elements, can be saved.

It has further been proposed that the notch is formed by a row of teeth integrally formed on the output shaft. The additional coupling elements and the resulting support space (Stauraum), weight and mounting costs can be reduced. The locking element can engage directly with the output shaft.

The locking element is guided by the support. Advantageously, a transmission element for transmitting the driving torque and / or for transmitting the holding torque can be formed on the support element.
Advantageously, the teeth of the transmission element are dentitions. By operating the switch, the coupling for transmitting the torque or transmitting the holding moment can be selected.

Other advantages will be apparent from the following description. The drawings illustrate only one embodiment of the invention. Many features are described in combination in the description of the drawings, the embodiments, and the claims. Those skilled in the art can separately consider these features in an advantageous manner and combine them into other advantageous combinations.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 shows a drill-chisel hammer provided with an electric motor, a transmission, and a striking mechanism (not shown) provided in a casing 10. The electric motor, the transmission, the striking mechanism, and the like are shown in FIG. Through the tool holder 5
The tool 56 tightened at 4 can be driven to rotate and can be driven to hit. On the side of the drill-chisel hammer facing the tool holder 54, a first extending perpendicular to the operating direction
Is attached to the casing 10. On the opposite side of the casing 10 from the tool 56, a U-shaped second hand grip 60 extending perpendicular to the operation direction is attached.

A drive shaft 32 disposed in the casing 10
The gear 34 is driven via (see FIG. 2). Gear 34
Is mounted on a shaft 36. On this axis 36, this axis 36
The pinion 38 is attached to an end of the pinion facing the output shaft 12. The output shaft 12 is formed from a hollow shaft.
The pinion 38 is engaged with a ring gear 40, and the ring gear 40 is supported by the output shaft 12 so as to be relatively rotatable. On the side opposite to the tool holder 54, the tooth row 42 is formed integrally with the ring gear 40.

The output shaft 12 can be uncoupled from the drive motor by a driving force via a switch 14, and can be fixed in the rotational direction. Furthermore, the drill-chisel hammer has an overrun clutch 16, which is interposed between the drive motor and the output shaft 12 in the power flow path of the rotational drive by the locking element 18. According to the present invention, the overrun clutch 16 is incorporated in the switch 14.

The overrun clutch 16 incorporated in the switch 14 has a locking element 18 formed of a roller.
And the locking element 18 is held by a support 26. The locking element 18 engages in a notch 22 radially inward in the rotational direction and is covered by a ring spring 24 radially outward. The notch 22 is formed integrally with the output shaft 12 to form a row of teeth. Ring spring 24 presses locking element 18 against notch 22. The locking element 18 and the ring spring 24 are arranged radially inside the switch sleeve 20 of the switch 14. The switch sleeve 20 radially surrounds the output shaft 12, the sleeve side wall of which is positively engaged with the support 26 of the locking element 18 radially inward. The switch sleeve 20 is operatively connected to the output shaft 12 via the support 26 and the locking element 18. A ring groove 44 is formed on the outer peripheral surface of the switch sleeve 20.
Are formed integrally, and eccentrically arranged projections 46 of a rotary switch 48 mounted on the outside of the casing 10 are engaged with the ring grooves 44 by shape coupling.

The support 26 of the locking element 18 in the axial direction
The transmission elements 28 and 30 are integrally formed on both sides of the transmission. The transmission elements 28, 30 are formed by tooth rows. By operating the rotary switch 48, the switch sleeve 20 is moved in the axial direction together with the support 26, the ring spring 24 and the locking element 18. When the switch sleeve 20 is moved toward the tool holder 54 in the axial direction via the rotary switch 48, the transmission element 28 integrally formed on the support 26 and the transmission element 42 integrally formed on the ring gear 40 Brought into an engaged state. The torque can then be transmitted from the drive shaft 32 of the drive motor to the output shaft 12 via the gear 34, the pinion 38, the ring gear 40, the transmission elements 42, 28, the support 26 and the locking element 18.

The tool 56 is locked to the material to be machined,
If the torque exceeds a specified value set by the ring spring 24 and the contour of the notch 22, the locking element 18 is displaced radially outward from the notch 22 of the output shaft 12 against the ring spring 24, and Locked.

When the switch sleeve 20 is turned,
Is moved in the direction opposite to the tool holder 54 in the axial direction through the transmission element 3 formed integrally with the support portion 26.
0 is brought into engagement with the transmission element 50. The transmission element 50 is integrally formed with a holding ring 52 fixed to the casing 10 so as not to rotate relatively. As a result, the output shaft 12 cannot rotate relative to the casing 10.
And the torque can be supported by the casing 10 from the output shaft 12 via the locking element 18, the support 26, the transmission elements 30, 50 and the retaining ring 52.

[Brief description of the drawings]

FIG. 1 is a side view showing a drill-chisel hammer.

FIG. 2 is a partial longitudinal sectional view of the drill-chisel hammer of FIG. 1;

[Explanation of symbols]

Reference Signs List 10 casing, 12 output shaft, 14 switch, 16 overrun clutch, 18 locking element, 20 switch sleeve, 22 notch, 2
4 ring spring, 26 support, 28, 30 transmission element, 32 drive shaft, 34 gear, 36
Shaft, 38 pinion, 40 ring gear, 42
Tooth row, 44 ring groove, 46 projection, 48 rotation switch, 50 transmission element, 52 holding ring, 54 tool holder, 56 tools, 58, 60
Hand grip

Claims (7)

[Claims] 1. A drill-chisel hammer comprising a drive motor disposed on a casing (10), by means of said drive motor, an insertion tool (4) disposed on a tool holder (54). 56) can be driven to hit through a hitting mechanism and can be driven to rotate via an output shaft (12), and the drill-chisel hammer has an overrun clutch (16), and the overrun clutch (16) A power flow path for rotational drive by a locking element (18), which is interposed between the drive motor and the output shaft (12), wherein the output shaft (12) is connected to a switch (14). ) Can be disengaged from the drive motor by driving force and can be fixed in the rotational direction, and the overrun clutch (16)
Is incorporated in said switch (14). Drill-chisel hammer. 2. The drill-chisel hammer according to claim 1, wherein a switch sleeve (20) of the switch (14) is operatively connected to the output shaft (12) via the locking element (18). 3. Drill-chisel hammer according to claim 1, wherein the locking element (18) is arranged radially inside the switch sleeve (20). 4. The locking element (18) engages in a notch (22) with a positive connection radially inward, as viewed in the direction of rotation, and is covered by a ring groove (24) radially outward. A drill-chisel hammer according to any one of the preceding claims. 5. The output shaft (12) wherein the notch (22) is provided.
The drill-chisel hammer according to claim 4, wherein the drill-chisel hammer is formed by a tooth row integrally formed with the hammer. 6. The device according to claim 1, wherein at least one transmission element for transmitting a driving moment is integrally formed on the support of the locking element. Or the drill according to item 1
Chisel hammer. 7. The support according to claim 1, wherein at least one transmission element for transmitting the holding moment is integrally formed on the support of the locking element. Drill according to any one of-
Chisel hammer.