JPH04269107A - Drill.chisel device - Google Patents

Abstract

PURPOSE: To provide a drilling and chipping tool provided with a locking mechanism capable of displacing a rod to the blow-free position without starting the operation of the drilling and chipping tool. CONSTITUTION: A drilling and chipping tool is provided with a blow mechanism and a tool holder 10 holding a tool. The blow is transmitted from the blow mechanism to the tool by a rod 4. The rod 4 is coupled with a control mechanism 7 through a locking element 6, and the control mechanism 7 is axially displaceable by the external operation of an operating member 8. The rod 4 can be moved to the position where no blow is generated by the axial displacement of the control mechanism 7.

Description

[Detailed description of the invention]

0001

[Technical Field] The present invention includes a tool holder and an impact mechanism that transmits an axial impact force to a tool mounted on the tool holder via a rod, and is controlled by a control mechanism that can be externally controlled by an operating member. The present invention relates to a hand-held drill and chisel device in which the rod is formed with at least one recess into which a locking element can be engaged.

0002

[Prior Art] Federal Republic of Germany Patent No. 3 627 8
In a hammer drill with an air-operated percussion mechanism as described in '69, the percussion action can be stopped by means of a hook element which can be engaged in a recess in the percussion member. That is, by holding the impact member in an end position where no impact action occurs, no axial impact force can be applied to the tool.

The hook elements mentioned above are radially movable. A radial eccentric deformation is formed in the inner circumferential region of the externally actuated operating member, which deformation controls the axial stroke of the pin. Rotating the operating member displaces the pin in the axial direction, and the pin controls the radial displacement of the hook element.

[0004] The impact member in the impact mechanism can be locked only at the front end position. The impact member must therefore be constructed in such a way that the radially spring-loaded hook element is guided radially by the ramp and engages in a recess in the impact member adjoining the ramp. The impact member cannot be locked unless it moves in the processing direction.

[0005]

DISCLOSURE OF THE INVENTION It is an object of the present invention to propose a drill and chisel device that is equipped with a locking mechanism that allows the rod to be displaced to a non-impact position without starting the operation of the drill and chisel device. It is in.

In order to solve this problem, the drill/chisel device according to the present invention is characterized in that, in the structure described above, the operating member is provided with a control means for displacing the control mechanism in the axial direction. .

According to the above-described configuration of the present invention, the control mechanism is displaced in the axial direction within the operating member by operating the operating member. As a result, the rod, which is connected to the control mechanism via the locking element, is displaced to the non-impact position. That is, the non-impact position of the rod can be reached simply by the operator manipulating the operating member without activating the drill and chisel device.

In the drill and chisel device according to the present invention, the control means for realizing the axial displacement of the control mechanism comprises:
It is advantageous to design it as a control surface arranged inside the actuating element. In this case, the movement of the actuating member is transmitted to the control mechanism via the control surface.

The control surface is advantageously designed as a helical groove. In this case, the control mechanism can be displaced in the axial direction by rotating the operating member. The ratio of the axial displacement amount of the control mechanism to the rotation angle of the operating member can be determined by the slope of the helical groove, that is, the helical angle.

Furthermore, it is advantageous in accordance with the invention that at least a part of the control mechanism can be engaged in the helical groove. In this case, it becomes possible to accurately guide the displacement of the control mechanism using the operating member.

Preferably, said part of the control mechanism is constructed as a cam arranged in a circumferential area of the control mechanism. Advantageously, the cam shape corresponds to the cross-section and slope of the helical groove. When arranging the cam in a circumferential area, it is possible to form the cam easily and economically.

The present invention can be particularly effectively applied to drill and chisel devices equipped with a removable tool holder. There is no need to switch or shut off the impact mechanism on the machine side. Particularly in the case of repetitive work over a long period of time, it is not necessary to pay attention to accurate adjustment on the machine side, so a particularly remarkable advantage is exhibited.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in more detail with reference to the illustrated embodiments.

The drill and chisel device according to the invention with the front region shown in FIG. 1 comprises a guide sleeve 1 . The guide sleeve 1 is rotatably supported within the device housing 3 by a pair of front and rear ball bearings 2. The axial position of one ball bearing 2 in the housing 3 is determined by the snap ring 3a.
regulated by. In the rear region of the guide sleeve 1 there is arranged a percussion mechanism with a pneumatically actuated percussion piston. Since such an impact mechanism itself is well known, illustration thereof is omitted.

In the front region of the guide sleeve 1 an axially displaceable rod 4 is arranged. The rod 4 is provided with an external spline 4a for torque transmission, and a circumferential groove 5 is formed in the rear end region of the external spline 4a. Advantageously, the cross-sectional shape of the groove 5 corresponds to the cross-sectional shape of the locking element 6. In this embodiment, the locking element 6 is constituted by a ball, and therefore the cross-sectional shape of the groove 5 is semicircular.

The tool holder 10 is used exclusively for rotating tools and has a shaft 11 that is attached to the front end of the drill/chisel device. A recess 11a is formed in the rear region of the shaft 11, in which an internal spline is provided which engages the spline 4a of the rod 4. In the central region of the recess 11a in the shaft 11, the locking element 6 is located in the unlocked state. A plurality of locking elements 6 may be provided as a set, and in particular, a set of three locking elements 6 may be arranged 120 degrees apart from each other in the circumferential direction of the shaft 11.
Advantageously, they are arranged at an angle of .degree.

The guide means of the locking element 6 are arranged in the radial hole 11.
b, and allows the locking element 6 to be displaced in the radial direction within the hole 11b. The hole 11b is provided in the rear region of the shaft 11 of the tool holder 10. The diameter of the ball as locking element 6 shall exceed the wall thickness of the shaft 11 in the region of the rear recess 11a. The control mechanism 7 is provided with a control member 7b for radially displacing the locking element 6 between a locking position and a locking release position. As mentioned above, since a plurality of locking elements 6 can be arranged in the circumferential direction,
Advantageously, all locking elements 6 are controlled by a control mechanism 7. Note that the control mechanism 7 can be operated from the outside using an operating member 8.

The control mechanism 7 is formed into a substantially cylindrical shape, and
It can be displaced in the axial direction within the operating member 8. Control mechanism 7
At least one cam 7a is provided in the outer peripheral area of the cam 7a.

A spiral groove 9 having a substantially rectangular cross section is formed inside the operating member 8 . The cam 7a is formed into a shape corresponding to the cross-sectional shape of the groove 9 and is fitted into the groove 9. A non-gradient region 9a is formed at the starting end and the terminal end of the groove 9. Non-gradient area 9a
shall exhibit a self-locking function that prevents the operating member 8 from rotating relative to the control mechanism 7 under the action of an axial load.

[0020] In order to realize pure rotational motion of the drill tool,
The rod 4 is displaced to a non-impact position and locked at that position.

The shaft 11 of the tool holder 10 has a pair of recesses (not shown) formed in its outer circumference at its rear end. Adjustment elements can be engaged in these recesses, which hold the operating member 8 in the locked and unlocked positions.

FIG. 2 shows the state in which the locking element 6 is engaged in the circumferential groove 5 of the rod 4. As shown in FIG. The control mechanism 7 is displaced in the axial direction by rotating the operating member 8. The control mechanism 7 is connected to the tool holder 1 via the locking element 6.
Since it is connected to the shaft 11 and rod 4 of 0, when the operating member 8 is rotated, each of the above-mentioned parts moves in the axial direction. The rod 4 is guided to an end position where no impact occurs and is held there. It is therefore possible to carry out machining that requires pure rotary movements with the drill and chisel device.

In the initial position shown in FIG. 1, the control mechanism 7 is located at the rear end of the operating member 8. The locking element 6 is released. When the shaft 11 of the tool holder 10 is mounted on the front region of the rod 4, the external spline 4a and the internal spline 11a mesh with each other. In the rear region of the actuating element 8, an intermediate disk 16 is arranged in a circumferential recess 17 of large internal diameter, which intermediate disk 16 is positioned in the recess 17 by a retainer ring 16a. The intermediate disk 16 is provided with a collar 16b which abuts against the front end surface 1a of the guide sleeve 1.

The control mechanism 7 rotates integrally with the operating member 8 by first displacing the operating member 8 in the circumferential direction. As a result, the control mechanism 7 is displaced to a position that coincides with the locking position of the locking element 6. At the same time, the locking element 6 engages in a recess 5 formed in the outer circumference of the rod 4.

In the region of the non-gradient starting end of the helical groove 9, a recess 12 is formed in the groove bottom in which the rotation stop 13 of the control mechanism 7 can engage. The rotation stop 13 is constituted by a ball which is pressed into a recess 12 by a spring force, and which ball 13 is arranged in a radial recess 14 provided in the cam 7a of the control mechanism 7. Guide the ball into the recess 14,
A spring 15 placed in the recess 14 is pressed. Operation member 8
Upon further rotation of the ball 13, the ball 13 is released from the recess 12 in the bottom of the groove 9 and engages in a recess 14 arranged in the cam.

When the operating member 8 is further rotated, the cam 7a
deviates from the non-gradient region 9a of the groove 9 and reaches the helical region. At this time, the control mechanism 7 moves relative to the operating member 8 in the axial direction.

The operating member 8 automatically stops rotating in the non-gradient region 9a that is connected to the spiral region of the groove 9 by a self-locking action.

[0028] When this position is reached, the rod 4 is locked in its end position, where no impact effects occur. The torque generated by the drive and transmitted to the rod 4 is transmitted from the rod 4 to the tool mounted on the tool holder 10.

The rod 4 is released by the reverse procedure to that described above.

[Brief explanation of the drawing]

FIG. 1 is a partially cut away longitudinal sectional view of the front part of the drill and chisel device according to the invention in the release position of the tool holder;

FIG. 2 is a partially cut away longitudinal sectional view of the front part of the drill and chisel device at the locking position of the tool holder.

[Explanation of symbols]

1 Guide sleeve 2 Ball bearing 3 Device housing 3a Snap ring 4 Rod 4a Spline 5 Circumferential groove 6 Locking element 7 Control mechanism 7a Cam 8 Operation member 9 Spiral groove 10 Tool holder 11 Shaft 11a Recess 11b hole 13 Rotation stopper 15 Spring 16 Intermediate disk

Claims (5)

[Claims] [Claim 1] A tool holder (10) and a tool holder (
an impact mechanism that transmits an impact force in the axial direction to the tool attached to the tool via the rod (4); In the hand-held drill/chisel device, the rod (4) is formed with at least one recess capable of engaging (6), the operating member (8) is equipped with a control mechanism (7). A drill/chisel device characterized by being provided with a control means for displacing it in the axial direction. 2. The drill and chisel device according to claim 1, wherein the control means in the control mechanism (7) is constituted by a control surface disposed inside the operating member (8). . 3. Device according to claim 2, characterized in that the control surface is formed as a helical groove (9). 4. A drill and chisel device according to claim 3, characterized in that the spiral groove (9) is engageable with at least a part of a control mechanism (7). 5. Device according to claim 4, characterized in that said part of the control mechanism (7) is formed as a cam (7a) arranged in the circumferential area of the control mechanism (7). Drill and chisel equipment.