JPH0737580U - Impact tool switching device - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a striking tool having a striking mechanism portion and a rotation transmitting mechanism portion, and its object is a switching device for shutting off and locking the rotation transmission to a tip tool. By this, the position of the tip of the tip tool in the circumferential direction is selected and the operability is improved by locking the tip tool at an appropriate position. [Structure] A clutch shaft 1 that can move only in the axial direction of the rotation transmission shaft 7 and the spring 20 inside the rotation transmission shaft 7.
9 and the steel ball 12 are arranged, and the rotation of the rotation transmission is performed by moving the steel ball 12 in and out by the operation of the settling member 18. Further, by operating the settling member 18, the rotation transmission shaft 7 is locked with respect to the main body frame 3, and three types of rotation transmission to the tip tool 11, interruption, and lock can be switched.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a switching device capable of switching rotation transmission of a striking tool to a tip tool, which includes a conversion mechanism section for converting rotation into reciprocating movement, a striking mechanism section and a rotation transmitting mechanism section.

[0002]

[Prior art]

 In a conventional switching device, as described in Japanese Utility Model Publication No. 63-20551, a structure in which a shifter is rotated to displace a movable clutch downward to disengage a meshing with a fixed clutch and cut off rotation transmission to a cylinder. The structure is such that the cylinder shaft cannot be locked with respect to the body frame, for example, gear housing and cylinder housing.

[0003]

[Problems to be solved by the device]

 In the conventional switching device that cuts off the rotation transmission of the impact tool to the tip tool, the shank part of the tip tool has a round bar shape, but if only the impact movement is given, the circumferential position cannot be determined and There is a problem that the workability is lowered due to the rotation. The object of the present invention is to provide a switching device that can block the rotation transmission to the tip tool by operating the settling member and switch to the lock position that locks the rotation with respect to the main body frame, and also the orientation of the tip tool can be freely set. Is to be able to fix the tip tool in the circumferential direction.

[0004]

[Means for Solving the Problems]

 The purpose of the above is to fasten the rotation transmission shaft and the second gear by the axial movement of the clutch shaft and the engagement of the steel balls, and to perform the operation of the clutch shaft from the outside of the main body frame with the settling member that can operate the rotation transmission shaft. It is possible to connect and disconnect with the second gear, and also switch the rotation transmission shaft to the lock position with respect to the main body frame. Positioning, that is, locking the main body frame and the rotation transmission shaft, makes the rotation transmission shaft hollow, makes the clutch shaft movable only in the axial direction with respect to the rotation transmission shaft, and operates the setting member attached to the main body frame to set the setting member and the clutch. This is achieved by making the shaft lock.

[0005]

[Action]

 In the switching device configured as described above, when the settling member is set to the position for transmitting the rotation, the clutch shaft loosely fitted in the hollow portion of the rotation transmitting shaft is held in the predetermined position by pressing the spring, The rotation transmission shaft and the second gear are connected and transmitted by the engagement of the balls. When blocking the rotation of the tip tool and positioning the tip tool in the circumferential direction, the clutch shaft installed in the hollow part of the rotation transmission shaft so that it can be moved only in the axial direction of the rotation transmission shaft acts as the main frame. By operating the tip tool to the position where it locks, the steel ball is dropped in the small diameter part that is held at the predetermined position and is provided on the clutch shaft, and the second gear and the rotation transmission shaft are disengaged and the tip tool's Makes turning easier. When the settling member is further moved to the lock position, the clutch shaft and the settling member are engaged with each other so that the main body frame and the clutch shaft are locked. That is, the clutch shaft locks with the rotation transmission shaft in the rotation direction, and finally operates so that the tool bit locks the body frame.

[0006]

【Example】

 An embodiment of the hammer drill according to the present invention will be described with reference to FIG. The rotary motion of the rotary drive motor shaft 2 in the drive motor housing 1 is transmitted from the first gear 4 in the main body frame 3 to the rotation transmission shaft 7 via the crankshaft 5 and the second gear 6. The rotation transmission shaft 7 meshes with a third gear 10 connected to the outer periphery of the cylinder 9 in the body frame 3 to rotate the cylinder 9. The tip tool 11 has a structure in which the rotational movement is transmitted by the rotation of the cylinder 9. A connecting rod 13 is attached to the crankshaft 5, and a piston 14 is attached to the connecting rod 13. A piston 14 and a striker 15 are slidably disposed in the cylinder 9, and the rotary motion of the rotary drive motor shaft 2 is reciprocated by a first gear 4, a crankshaft 5, a connecting rod 13, and a piston 14. Is converted to. The air chamber 17 between the piston 14 and the striking element 15 changes in compression, and the striking element 15 reciprocates to strike the intermediate striking element 16 and transmit the striking force to the tip tool 11. A clutch shaft 19 pressed by the spring 20 is inserted into the hollow portion 7a of the rotation transmitting shaft 7 so that the clutch shaft 19 is movable relative to the rotation transmitting shaft 7 only in the axial direction. The central portion of the clutch shaft 19 becomes a small diameter portion 19b of the clutch shaft to such an extent that the steel ball 12 falls, and the lower end portion of the clutch shaft 19 has several clutches that engage with the locking pin 18a of the stabilizing member 18. A shaft recess is provided. For rotation transmission, as shown in FIGS. 4 to 6, when the settling member is moved to the rotation side, the second gear 6 is provided with a second gear recess 6a in which the steel ball 12 engages, so that the rotation transmission shaft The steel balls 12 incorporated in the holes are configured to be keyed. To stop the rotational movement, the second gear 6 and the rotation transmission shaft 7 are moved by rotating the settling member 18 which is attached to the main body frame 3 in the state shown in FIGS. 1 to 3 and moving the clutch shaft 19 in the axial direction. The steel ball 12 engaged therebetween moves to the clutch shaft thin portion 19b, and the rotational movement of the second gear 6 idles on the rotation transmission shaft 7. That is, transmission of rotational movement to the tip tool 11 is also cut off. Further, as shown in FIG. 3, when the clutch shaft recessed portion 19a and the locking pin 18a of the setting member 18 are locked, the rotation transmission shaft 7 is fixed to the main body frame 3, and the rotation transmission shaft 7 cannot rotate. Therefore, it is possible to position the tip tool 11 in the circumferential direction.

[0007]

[Effect of device]

 According to the present invention, by operating the settling member attached to the main body frame, it is possible to transmit the rotational movement to the tip tool, block the rotational movement, and lock the tip tool in the rotational direction with respect to the main body frame. Even if the shank has a round bar shape, it is possible to select the cutting edge direction of the tip tool, which improves the workability of breaking, chipping and grooving the work material.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a hammer drill according to the present invention when locked in a rotating direction of a tip tool.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is a projection enlarged view seen from B of FIG.

FIG. 4 is an enlarged partial cross-sectional view showing an embodiment when transmitting the rotational movement of the rotation transmitting shaft of the hammer drill according to the present invention.

5 is a cross-sectional view taken along line CC of FIG.

6 is a cross-sectional view taken along the line DD of FIG.

[Explanation of symbols]

1 is a drive motor housing, 2 is a rotary drive motor shaft, 3 is a main body frame, 7 is a rotation transmission shaft, 11 is a tip tool, 1
8 is a settling member, 19 is a clutch shaft, and 20 is a spring.

Claims (1)

[Scope of utility model registration request] 1. A conversion mechanism unit which is connected to a rotary drive motor and converts a rotational motion into a reciprocating motion, an impact mechanism unit which is connected to the conversion mechanism unit, and a rotation transmission mechanism unit which transmits rotation to a tip tool. In the impact tool switching device, wherein the axis of the striking mechanism portion is arranged at a position orthogonal to the rotation driving motor shaft, the rotation transmission shaft is provided inside the rotation transmission shaft arranged in parallel with the rotation driving motor shaft. A clutch shaft that can move only in the direction and a spring that presses the clutch shaft are provided, and the clutch shaft is operated by a settling member that can be operated from the outside of the body frame. A percussion tool cutting machine characterized by having a switching mechanism capable of switching the rotation transmission shaft to a locking position for locking with respect to the main body frame. Replacement device.