Work machine

Abstract

To enhance workability.SOLUTION: In a hammer drill 1, at least a part of a depth gauge 60 is accommodated in an accommodation chamber 12A of a housing 10, and the other part of the depth gauge 60 extends forward from the housing 10 in a manner allowing contacting the workpiece W. To be specific, an inner gauge 62 of the depth gauge 60 is accommodated in the accommodation chamber 12A of the main body housing portion 12, and an outer gauge 70 of the depth gauge 60 is supported by the inner gauge 62 and extends forward from the housing 10. This configuration enables downsizing the hammer drill 1 including the depth gauge 60 compared with a configuration in which the entire depth gauge 60 is disposed outside the housing 10. Thereby, workability of the hammer drill 1 can be enhanced.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a working machine.

Background Art

[0002] In the electric drill (working machine) described in Patent Document 1 below, a stopper (auxiliary mechanism) for adjusting the drilling depth is attached to the side handle, and a plurality of attachment holes are formed in the side handle. Thereby, the attachment position of the stopper can be changed according to the outer shape of the electric drill.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the above electric drill has room for improvement in the following points. That is, in the above electric drill, the entire stopper extends parallel to the drill outside the electric drill. For this reason, the size of the electric drill including the stopper becomes large, and the workability of the electric drill may be reduced.

[0005] In consideration of the above facts, an object of the present invention is to provide a working machine capable of improving workability.

Means for Solving the Problems

[0006] One or more embodiments of the present invention include a housing having an accommodation chamber therein, a motor accommodated in the accommodation chamber, a tip tool extending from the housing to one side in a first direction and rotating with the first direction as the axial direction by the driving force of the motor, a power transmission mechanism accommodated in the accommodation chamber and transmitting the driving force of the motor to the tip tool, and an auxiliary mechanism at least partially accommodated in the accommodation chamber, extending from the housing to one side in the first direction so as to be able to contact a workpiece, and assisting the operation of the tip tool with respect to the workpiece.

[0007] One or more embodiments of the present invention are such that the auxiliary mechanism is configured to be extendable and contractible in the first direction, and when the auxiliary mechanism contacts the workpiece, it indicates to the operator that the separation distance between the housing and the workpiece has reached a set distance, and the set distance is changed by the extension and contraction of the auxiliary mechanism.

[0008] One or more embodiments of the present invention are such that the accommodation chamber has a first accommodation chamber for accommodating the motor and a second accommodation chamber for accommodating the power transmission mechanism, and at least a part of the auxiliary mechanism is accommodated in the second accommodation chamber.

[0009] One or more embodiments of the present invention are such that the power transmission mechanism has a first mechanism part and a second mechanism part. The second mechanism part is located on one side in a second direction orthogonal to the first direction with respect to the first mechanism part. The first mechanism part has a first annular member that constitutes the outermost periphery of the first mechanism part when viewed from the first direction. The second mechanism part has a second annular member that constitutes the outermost periphery of the second mechanism part and overlaps the first annular member when viewed from the first direction. When viewed from the first direction, the portion of the auxiliary mechanism accommodated in the second accommodation chamber is arranged side by side in a third direction orthogonal to the second direction with the overlapping portion of the first annular member and the second annular member.

[0010] One or more embodiments of the present invention are such that the auxiliary mechanism includes a tubular fixed-side member disposed inside the housing chamber and supported by the housing, and a contact portion having one end in contact with the workpiece at the set distance, and the other end portion is disposed inside the fixed-side member and is movably supported by the fixed-side member in the first direction. It is a working machine configured to include a movable-side member.

[0011] One or more embodiments of the present invention are such that a fan is housed in the housing chamber, and an air flow is generated by the rotation of the fan by the driving force of the motor. The movable-side member is formed in a tubular shape, and the inside of the fixed-side member and the movable-side member is an air flow path for flowing the air flow in the housing chamber to the contact portion, and the air flow is exhausted from the opening of the contact portion. It is a working machine.

[0012] One or more embodiments of the present invention are such that the movable-side member is a working machine configured to be able to change the orientation of the opening in the contact portion.

[0013] One or more embodiments of the present invention are such that the movable-side member includes a base-end-side movable portion extending in the first direction and movably provided inside the fixed-side member, and a tip-end-side movable portion extending in the first direction outside the housing and having the contact portion at the tip end, and a connecting portion that connects the tip end portion of the base-end-side movable portion and the base end portion of the tip-end-side movable portion and relatively rotatably connects the tip-end-side movable portion to the base-end-side movable portion with the second direction orthogonal to the first direction as the axial direction. It is a working machine configured to include.

[0014] One or more embodiments of the present invention are such that an exhaust port for exhausting the air flow and a communication hole for communicating the inside and the outside of the housing are formed in the housing chamber, and the contact portion of the tip-end-side movable portion relatively rotated with respect to the base-end-side movable portion and extending to the other side in the first direction from the connecting portion is inserted into the communication hole, and the air flow path communicates with the inside of the housing chamber. It is a working machine.

[0015] In one or more embodiments of the present invention, a fan is housed in the housing chamber, and the rotation of the fan by the driving force of the motor generates an air flow. The auxiliary mechanism is formed in a long tubular shape and has an air flow path for flowing the air flow in the housing chamber toward the tip end side, and is a working machine that exhausts the air flow from an opening at the tip end portion.

[0016] One or more embodiments of the present invention include a housing having a housing chamber therein, a motor housed in the housing chamber, a fan rotated by the driving force of the motor, a tip tool extending from one side of the housing in a first direction and rotated about the first direction as an axial direction by the driving force of the motor, a power transmission mechanism housed in the housing chamber and transmitting the driving force of the motor to the tip tool, and an auxiliary mechanism formed in a tubular shape and exhausting the air flow generated by the fan toward a workpiece. At least a part of the auxiliary mechanism is housed in the housing chamber, and it is a working machine that extends from the housing to one side in the first direction.

Advantages of the Invention

[0017] According to one or more embodiments of the present invention, workability can be improved.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

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Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Embodiments for Carrying Out the Invention

[0019] Hereinafter, with reference to the drawings, the hammer drill 1 as a working machine according to the present embodiment will be described. The arrows UP, FR, and RH appropriately shown in the drawings indicate the upper side, the front side, and the right side of the hammer drill 1. In the following description, when directions such as up and down, front and back, and left and right are used for explanation, unless otherwise specified, they indicate the up and down direction, the front and back direction, and the left and right direction of the hammer drill 1. The front and back direction corresponds to the first direction of the present invention, the up and down direction corresponds to the second direction of the present invention, and the left and right direction corresponds to the third direction of the present invention.

[0020] As shown in FIGS. 1 to 4, the hammer drill 1 is a power tool for performing drilling or the like on a workpiece W. The hammer drill 1 includes a housing 10, a motor 30, and a power transmission mechanism 40. Further, the hammer drill 1 has a depth gauge 60 as an auxiliary mechanism for setting the drilling depth during drilling.

[0021] (Regarding the housing 10) The housing 10 is formed in a hollow shape and constitutes the outer shell of the hammer drill 1. When viewed from the right side, the housing 10 is formed in a substantially reverse L shape. Specifically, the housing 10 has a main body housing portion 12 extending in the front-rear direction and a handle housing portion 14 extending downward from the rear end portion of the main body housing portion 12.

[0022] A trigger 20 is provided at the upper end portion of the handle housing portion 14. The trigger 20 protrudes forward from the handle housing portion 14 so as to be operable to be pulled backward. As shown in FIG. 4, a switch 22 is provided inside the upper end portion of the handle housing portion 14, behind the trigger 20. The switch 22 is electrically connected to a controller (not shown) and outputs an output signal corresponding to the operation of the trigger 20 to the controller. A power cord 24 is provided on the handle housing portion 14, and the power cord 24 extends downward from the handle housing portion 14. The power cord 24 is configured to be connectable to an AC power supply. Thereby, power is supplied to the motor 30 described later.

[0023] The interior of the main body housing portion 12 is a housing chamber 12A that houses a motor 30 and a power transmission mechanism 40, which will be described later. That is, the housing chamber 12A extends in the front-rear direction. An inner case 16 is provided at the middle portion in the front-rear direction of the housing chamber 12A, and the inner case 16 divides the housing chamber 12A in the front-rear direction. Specifically, the rear portion of the housing chamber 12A is a first housing chamber 12A1, and the front portion of the housing chamber 12A is a second housing chamber 12A2. The inner case 16 is formed in a generally bottomed cylindrical shape that is open to the front as a whole, is disposed within the middle portion in the front-rear direction of the main body housing portion 12, and is held by the main body housing portion 12. An attachment cylinder portion 16A is formed at a substantially central portion of the bottom wall of the inner case 16. The attachment cylinder portion 16A is formed in a generally cylindrical shape with the front-rear direction as the axial direction and protrudes rearward from the inner case 16. A raised portion 12B that bulges downward is formed on the lower wall of the main body housing portion 12, and the raised portion 12B is disposed so as to straddle the first housing chamber 12A1 and the second housing chamber 12A2.

[0024] As shown in FIGS. 1 and 3, a plurality of intake ports 12C are formed through the rear end portions of the left and right side walls of the main body housing portion 12. The intake ports 12C are formed in a long hole shape that extends in the front-rear direction, and the plurality of intake ports 12C are arranged side by side in the vertical direction. Further, a plurality of exhaust ports 12D are formed through the middle portions in the front-rear direction of the left and right side walls of the main body housing portion 12, and the front end portion of the first housing chamber 12A1 opens to the outside in the left-right direction through the exhaust ports 12D. The exhaust ports 12D are formed in a long hole shape that extends in the vertical direction. Taking a pair of exhaust ports 12D arranged in the vertical direction as one row, two rows of exhaust ports 12D are arranged side by side in the front-rear direction. Further, exhaust ports 12D are also formed in the raised portion 12B on the lower wall of the main body housing portion 12 (see FIG. 6).

[0025] On the front wall of the main body housing part 12, a head part 12E is formed. The head part 12E is formed in a substantially cylindrical shape with the front-rear direction as the axial direction and protrudes forward from the main body housing part 12. And the handle mounting part 18A of the side handle 18 is fixed in a state of being externally inserted into the head part 12E, and the side handle 18 extends leftward from the handle mounting part 18A. On the front wall of the main body housing part 12, a fixing hole 12F (see FIG. 5) for fixing a fixture 80 of a depth gauge 60 to be described later is formed to penetrate in the front-rear direction obliquely downward to the right of the head part 12E. At the front end part of the raised part 12B of the main body housing part 12, a communication hole 12G (see FIGS. 9 and 10) is formed to penetrate in the front-rear direction, and the inside of the communication hole 12G communicates with the inside of the first accommodation chamber 12A1. The communication hole 12G is located at a predetermined interval below the fixing hole 12F in a front view seen from the front side.

[0026] (Regarding the motor 30) As shown in FIG. 4, the motor 30 is accommodated in the first accommodation chamber 12A1 of the main body housing part 12. The motor 30 has a drive shaft 30A with the front-rear direction as the axial direction. The rear end part of the drive shaft 30A is rotatably supported by a motor bearing 32, and the front end part of the drive shaft 30A is rotatably supported by a motor bearing 34. The motor bearing 32 is fixed to the main body housing part 12, and the motor bearing 34 is fixed to the mounting cylinder part 16A of the inner case 16. The front end part of the drive shaft 30A passes through the inside of the mounting cylinder part 16A of the inner case 16 and is arranged inside the inner case 16. A pinion gear 30B is formed at the front end part of the drive shaft 30A.

[0027] On the front-end side portion of the drive shaft 30A, a fan 36 is provided so as to be integrally rotatable on the rear side of the inner case 16. The exhaust port 12D described above is located radially outside the diameter of the fan 36. The fan 36 is a centrifugal fan, and it causes the air on the central side of the fan 36 to flow out radially outward. Thereby, when the fan 36 rotates, an air flow AR flowing into the main body housing portion 12 from the intake port 12C is generated. The air flow AR passes through the motor 30, flows from the central portion of the fan 36 radially outward, and is exhausted from the exhaust port 12D to the outside of the main body housing portion 12. Thus, the motor 30 is cooled by the air flow AR.

[0028] (Regarding the power transmission mechanism 40) The power transmission mechanism 40 is housed in the second housing chamber 12A2 of the main body housing portion 12. The power transmission mechanism 40 has a first power transmission mechanism portion 41 as a first mechanism portion and a second power transmission mechanism portion 50 as a second mechanism portion, and the second power transmission mechanism portion 50 is disposed above the first power transmission mechanism portion 41.

[0029] The first power transmission mechanism portion 41 has an intermediate shaft 42 with the front-rear direction as the axial direction, and the intermediate shaft 42 is disposed at the lower part of the second housing chamber 12A2. The front end portion of the intermediate shaft 42 is rotatably supported by an intermediate bearing 43 fixed to the main body housing portion 12, and the rear end portion of the intermediate shaft 42 is rotatably supported by an intermediate bearing 44 fixed to the inner case 16. A transmission gear 45 is provided integrally rotatably on the rear end side portion of the intermediate shaft 42, and the transmission gear 45 meshes with the pinion gear 30B of the drive shaft 30A of the motor 30.

[0030] On the front-end side portion of the intermediate shaft 42, an intermediate gear 46 is externally inserted. The intermediate gear 46 is integrally and rotatably connected to the intermediate shaft 42. On the intermediate shaft 42, on the rear side of the intermediate gear 46, a substantially cylindrical clutch 47 is externally inserted. The clutch 47 is connected to the intermediate shaft 42 so as to be movable in the front-rear direction and is integrally and rotatably connected to the intermediate shaft 42. Between the intermediate gear 46 and the clutch 47, a biasing spring 48 configured as a compression coil spring is provided, and the biasing spring 48 biases the intermediate gear 46 and the clutch 47 outward in the front-rear direction.

[0031] On the intermediate shaft 42, on the rear side of the clutch 47, a reciprocating bearing 49 as a first annular member is provided. The reciprocating bearing 49 is formed in an annular (ring-shaped) shape and has an arm portion protruding upward. The reciprocating bearing 49 is configured as a conversion member that converts the rotational motion of the intermediate shaft 42 to reciprocate a piston 55, which will be described later, in the front-rear direction. The clutch 47 and the reciprocating bearing 49 are connected so that the reciprocating bearing 49 rotates integrally with the intermediate shaft 42.

[0032] The second power transmission mechanism portion 50 includes a cylinder 51, a piston 55, a striker 56, and an intermediate member 58. The cylinder 51 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction and is housed in the upper part of the second housing chamber 12A2 of the main body housing portion 12. The cylinder 51 is rotatably connected to the inner case 16 and the main body housing portion 12. A tool attachment portion 52 is attached to the front end portion of the cylinder 51, and the rear end portion of a bit BT as a tip tool extending in the front-rear direction is detachably fixed by the tool attachment portion 52. Thereby, the bit BT extends forward from the main body housing portion 12.

[0033] In the axial middle part of the cylinder 51, a cylinder gear 53 as a second annular member is provided. The cylinder gear 53 is formed in an annular (ring shape) and is externally inserted into the cylinder 51. A flange for restricting the forward movement of the cylinder gear 53 is formed on the cylinder 51. On the front side of the cylinder gear 53, a biasing spring 54 configured as a compression coil spring is provided. By the biasing spring 54, the cylinder gear 53 is pressed against the flange of the cylinder 51 and is configured to be rotatable integrally with the cylinder 51. Further, the cylinder gear 53 meshes with an intermediate gear 46 of the first power transmission mechanism portion 41. Thus, when the intermediate shaft 42 rotates by the driving force of the motor 30, the cylinder 51 and the bit BT rotate around the axis of the cylinder 51.

[0034] The piston 55 is formed in a substantially bottomed cylindrical shape open to the front side and is inserted into the rear part of the cylinder 51 so as to be relatively movable in the front-rear direction. And the upper end portion of the arm portion of the reciprocating bell crank 49 is rotatably connected to the rear end portion of the piston 55 with the left-right direction as the axial direction. Thus, when the reciprocating bell crank 49 rotates integrally with the intermediate shaft 42, the piston 55 reciprocates in the front-rear direction by the reciprocating bell crank 49.

[0035] The striker 56 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction and is inserted into the piston 55 so as to be relatively movable in the front-rear direction. And the space between the bottom wall of the piston 55 and the striker 56 in the piston 55 is configured as an air chamber 57. The intermediate member 58 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction, is inserted into the front end portion of the cylinder 51 so as to be relatively movable in the front-rear direction, and is disposed adjacent to the front side of the striker 56. Thus, when the piston 55 moves forward and the pressure in the air chamber 57 rises, the striker 56 and the intermediate member 58 move forward, and an impact force along the front-rear direction is applied to the bit BT.

[0036] Here, as shown in FIG. 7, in a front view, the reciprocating bearing 49 constitutes the outermost circumference of the first power transmission mechanism portion 41, and the cylinder gear 53 constitutes the outermost circumference of the second power transmission mechanism portion 50. Also, the diameter of the cylinder gear 53 is set to be larger than the diameter of the reciprocating bearing 49. Further, in a front view, the cylinder gear 53 and the reciprocating bearing 49 overlap vertically. Thereby, in the second accommodation chamber 12A2, in a front view, a dead space DS that is not used for accommodating the power transmission mechanism 40 is formed outside the left - right direction of the overlapping portion 40A (the hatched portion in FIG. 7) of the cylinder gear 53 and the reciprocating bearing 49. The dead space DS is located below the outer end portion in the left - right direction of the cylinder gear 53 and radially outside the reciprocating bearing 49 in a front view.

[0037] (Regarding the depth gauge 60) As shown in FIGS. 1 to 3 and FIGS. 5 to 8, the depth gauge 60 extends in the front - rear direction as a whole. The rear portion of the depth gauge 60 is accommodated in the housing 10, and the front portion of the depth gauge 60 protrudes forward from the housing 10. The depth gauge 60 sets the drilling depth during the drilling operation of the hammer drill 1 to assist the drilling work. Specifically, when the front end portion of the depth gauge 60 abuts against the workpiece W during the drilling operation, the forward movement of the hammer drill 1 is restricted. Thereby, it indicates to the operator that the separation distance between the housing 10 and the workpiece W in the front - rear direction has reached the set distance, and notifies that the hole processed by the bit BT has reached the set depth. Also, the depth gauge 60 is configured to be telescopable in the front - rear direction, and by the expansion and contraction of the depth gauge 60, the above - mentioned set distance is changed.

[0038] The depth gauge 60 is configured to include an inner gauge 62 as a fixed-side member, an outer gauge 70 as a movable-side member, and a fixture 80. The inner gauge 62 is formed in a substantially long tubular shape and is accommodated in the accommodation chamber 12A of the main body housing portion 12. The inner gauge 62 has a first inner tube 64 and a second inner tube 66. As shown in FIGS. 5 and 6, the first inner tube 64 is disposed on the right side of the front end portion of the first accommodation chamber 12A1 in the main body housing portion 12 and on the front side of the fan 36, and extends in the vertical direction. The lower end portion of the first inner tube 64 is bent forward and is fitted into the mounting hole 16B formed in the inner case 16, and is disposed in the rear end portion of the second accommodation chamber 12A2. Thereby, the first inner tube 64 is held by the inner case 16. The upper end portion of the first inner tube 64 is bent to the left when viewed from the rear side and is bent obliquely downward to the left when viewed from the upper side, and the rear end opening of the first inner tube 64 opens radially inward of the fan 36 above the fan 36.

[0039] As shown in FIGS. 5 and 7, the second inner tube 66 extends in the front-rear direction in the second accommodation chamber 12A2 of the main body housing portion 12. Specifically, the second inner tube 66 is located in the dead space DS on the right side in the second accommodation chamber 12A2. Thereby, when viewed from each of the left-right direction and the up-down direction, the second inner tube 66 overlaps with the power transmission mechanism 40. In other words, in the left-right direction, the accommodation position of the second inner tube 66 in the second accommodation chamber 12A2 is set so that the second inner tube 66 is substantially within the range of the maximum left-right dimensions of the power transmission mechanism 40. Further, the rear end portion of the second inner tube 66 is fitted into the front end portion of the first inner tube 64 and is fixed to the first inner tube 64. The front end portion of the second inner tube 66 is fixed to a fixture 80 described later.

[0040] As shown in FIGS. 1 to 3 and 5, the outer gauge 70 is formed in a substantially long tubular shape that extends in the front-rear direction as a whole. The outer gauge 70 includes a base-end gauge tube 71 as a base-end movable portion, a connection tube unit 72 as a connection portion, and a tip-end gauge tube 77 as a tip-end movable portion.

[0041] The base end gauge tube 71 extends along the front-rear direction. The outer diameter of the base end gauge tube 71 is set slightly smaller than the inner diameter of the second inner tube 66, and the base end gauge tube 71 is inserted into the second inner tube 66 from the front end of the second inner tube 66 and is supported by the second inner tube 66 so as to be movable in the front-rear direction. Specifically, the base end gauge tube 71 (outer gauge 70) is configured to be movable between an initial position (the position shown by the solid line in FIG. 1) and an extended position (the position shown by the two-dot chain line in FIG. 1) that has moved forward from the initial position.

[0042] As shown in FIGS. 3 and 8, the connecting pipe unit 72 is bent in a substantially crank shape when viewed from the right side. The connecting pipe unit 72 includes a core pipe 73, an upper connecting pipe 74, a lower connecting pipe 75, and a cover 76. The core pipe 73 is arranged with the vertical direction as the axial direction and constitutes the longitudinal intermediate part of the connecting pipe unit 72. A retaining portion 73A that projects radially outward is formed on the outer peripheral portion of the lower end of the core pipe 73.

[0043] The upper connecting pipe 74 is bent in a substantially reverse L shape when viewed from the right side. The front end of the base end gauge tube 71 is fitted into the upper opening of the upper connecting pipe 74, and the upper connecting pipe 74 is connected to the base end gauge tube 71 so as not to be relatively movable. The upper end of the core pipe 73 is fitted into the lower opening of the upper connecting pipe 74, and the core pipe 73 and the upper connecting pipe 74 are connected so as not to be relatively movable.

[0044] The lower connecting pipe 75 is bent in a substantially L shape when viewed from the right side. The lower end of the core pipe 73 is inserted into the upper end of the lower connecting pipe 75, and the lower connecting pipe 75 is connected to be rotatable around the axis of the core pipe 73. Thereby, the lower connecting pipe 75 is rotatably connected to the upper connecting pipe 74 (base end gauge tube 71) with the vertical direction as the axial direction by the core pipe 73. A retaining groove portion 75A that projects radially outward is formed at the upper end of the lower connecting pipe 75, and the retaining portion 73A of the core pipe 73 is rotatably inserted into the retaining groove portion 75A.

[0045] The cover 76 is formed in a substantially cylindrical shape with the vertical direction as the axial direction and is located on the radially outer side of the core tube 73. The upper end portion of the lower connecting pipe 75 is inserted into the lower end portion of the cover 76, and the cover 76 and the lower connecting pipe 75 are connected so as not to be relatively rotatable. Four claw portions 76A are formed at the upper end portion of the cover 76, and the claw portions 76A are configured to be elastically deformable in the radial direction of the cover 76. The lower end portion of the upper connecting pipe 74 is inserted into the four claw portions 76A, and the upper connecting pipe 74 and the cover 76 are connected. An engaging surface 74A that engages with the claw portion 76A is formed on the outer peripheral portion of the upper connecting pipe 74. Thereby, the relative rotation of the lower connecting pipe 75 with respect to the upper connecting pipe 74 (base end gauge pipe 71) is restricted, and the lower connecting pipe 75 is held. On the other hand, when a rotational force is applied to the lower connecting pipe 75 and the claw portion 76A elastically deforms radially outward, the relative rotation of the lower connecting pipe 75 with respect to the upper connecting pipe 74 (base end gauge pipe 71) is permitted. And every time the lower connecting pipe 75 rotates 90 degrees with respect to the upper connecting pipe 74, the claw portion 76A of the cover 76 and the engaging surface 74A of the upper connecting pipe 74 engage with each other, and the lower connecting pipe 75 is held by the core tube 73.

[0046] As shown in FIGS. 1 to 3 and FIG. 5, the tip gauge pipe 77 extends in the front-rear direction. The rear end portion of the tip gauge pipe 77 is fitted into the front opening of the lower connecting pipe 75 of the connecting pipe unit 72, and the tip gauge pipe 77 and the connecting pipe unit 72 are connected. Thereby, the tip gauge pipe 77 is disposed below the base end gauge pipe 71 by the connecting pipe unit 72, and the rear end portion of the tip gauge pipe 77 is rotatably connected to the front end portion of the base end gauge pipe 71 with the vertical direction as the axial direction. The tip portion (front end portion) of the tip gauge pipe 77 is a contact portion 77A that contacts the workpiece W.

[0047] As shown in Fig. 8, the fixture 80 is composed of a fixture body 81, a fixing screw 82, and a clamp member 83. The fixture body 81 is formed in a substantially stepped cylindrical shape with the front-back direction as the axial direction. Specifically, the front end portion of the fixture body 81 protrudes radially outward compared to other portions. And the fixture body 81 is fitted into the fixing hole 12F of the main body housing portion 12 and fixed to the main body housing portion 12. The front end portion of the aforementioned second inner tube 66 is fitted into the rear end portion of the fixture body 81 and fixed to the fixture body 81. Also, the base end gauge tube 71 passes through the fixture body 81. A female screw portion 81A is formed at the front portion of the inner peripheral surface of the fixture body 81.

[0048] The fixing screw 82 is formed in a substantially cylindrical shape with the front-back direction as the axial direction, and a flange portion 82A protruding radially outward is formed at the front end portion of the fixing screw 82. A male screw portion 82B is formed on the outer peripheral portion of the fixing screw 82. The fixing screw 82 is inserted into the fixture body 81 from the front side, and the male screw portion 82B is screwed into the female screw portion 81A, so that the fixing screw 82 is connected to the fixture body 81. The aforementioned base end gauge tube 71 passes through the inside of the fixing screw 82. An inclined surface 82C is formed at the rear portion of the inner peripheral surface of the fixing screw 82, and the inclined surface 82C is inclined radially outward of the fixing screw 82 as it goes toward the rear side.

[0049] The clamp member 83 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction, and a part of the peripheral wall of the clamp member 83 is open in the radial direction. That is, the clamp member 83 is formed in a cylindrical shape with a part cut out and is configured to be elastically deformable in the radial direction. The clamp member 83 is disposed radially inward of the inclined surface 82C of the fixing screw 82, and the base end gauge tube 71 passes through the inside of the clamp member 83. The outer peripheral surface of the clamp member 83 is inclined radially outward as it goes toward the rear side corresponding to the inclined surface 82C and is disposed adjacent to the radially inner side of the inclined surface 82C. Therefore, by rotating the fixing screw 82 screwed into the fixture body 81 and moving it rearward, the inclined surface 82C of the fixing screw 82 presses against the outer peripheral surface of the clamp member 83, and the clamp member 83 elastically deforms radially inward. Thereby, the clamp member 83 clamps the base end gauge tube 71, and the base end gauge tube 71 is fixed by the fixture 80.

[0050] Then, as shown in FIG. 1, at the initial position of the outer gauge 70, the tip of the base end gauge tube 71 protrudes forward from the fixture 80, and the contact portion 77A of the tip gauge tube 77 is located rearward of the front end of the bit BT. Then, by moving the outer gauge 70 forward and fixing it at an arbitrary position, the set distance between the housing 10 and the workpiece W in the front-rear direction is set, and the drilling depth during drilling can be set. On the other hand, at the extended position of the outer gauge 70, the contact portion 77A of the tip gauge tube 77 is located forward of the front end of the bit BT. Thereby, the depth gauge 60 can correspond to a relatively long bit BT. Further, as shown in FIG. 2, when viewed from the front, the outer gauge 70 overlaps the main body housing portion 12, and during drilling, the outer gauge 70 does not protrude in the left-right direction with respect to the main body housing portion 12.

[0051] Also, as shown in FIGS. 9 and 10, when the operator rotates the tip gauge tube 77 180 degrees relative to the base gauge tube 71 with the vertical direction as the axial direction and moves the outer gauge 70 rearward, the lengths of the base gauge tube 71 and the tip gauge tube 77 are set so that the contact portion 77A of the tip gauge tube 77 is inserted into the communication hole 12G of the main body housing portion 12 (hereinafter, this state of the depth gauge 60 is referred to as the stored state).

[0052] Furthermore, the interior of the depth gauge 60 (inner gauge 62 and outer gauge 70) is an air flow path 60A. When the fan 36 rotates, an air flow AR flowing out radially outward of the fan 36 flows into the air flow path 60A from the rear opening of the inner gauge 62 (depth gauge 60). The air flow AR flows in the air flow path 60A toward the contact portion 77A of the tip gauge tube 77 and is exhausted from the contact portion 77A. Also, in the stored state of the depth gauge 60, the air flow AR exhausted from the contact portion 77A flows into the first housing chamber 12A1 of the main body housing portion 12 and is exhausted to the outside of the main body housing portion 12 through the exhaust port 12D of the first housing chamber 12A1.

[0053] (Function and Effect) In the hammer drill 1 configured as described above, when performing drilling, the depth gauge 60 sets the drilling depth. Specifically, the fixing screw 82 in the depth gauge 60 is rotated counterclockwise in a front view to release the pressing force of the fixing screw 82 on the clamping member 83. In this state, the outer gauge 70 is moved in the front-rear direction to set the distance between the housing 10 and the workpiece W in the front-rear direction to a predetermined set distance corresponding to the drilling depth. After setting the drilling depth, the fixing screw 82 is rotated clockwise in a front view to fix the base gauge tube 71 by the clamping member 83. Thereby, the setting of the drilling depth is completed. In drilling, by pulling the trigger 20, the motor 30 is driven, and a rotational force and an impact force are applied to the bit BT by the power transmission mechanism 40. Thereby, drilling by the bit BT is performed on the workpiece W.

[0054] When the drilling depth into the workpiece W reaches the set depth, the contact portion 77A of the depth gauge 60 contacts the workpiece W. For this reason, the movement of the hammer drill 1 toward the front side (the workpiece W side) is restricted by the depth gauge 60. Thus, the operator recognizes that the drilling depth into the workpiece W by the bit BT has reached the set depth. Thereby, the drilling process for the workpiece W is completed.

[0055] Next, with reference to FIG. 11, the operation of removing dust and the like remaining in the processing hole H formed in the workpiece W will be described. In this case, in the outer gauge 70, the tip gauge tube 77 is rotated 90 degrees to the right with respect to the base gauge tube 71 so as to extend to the right from the connecting tube unit 72. In this state, the tip of the tip gauge tube 77 is inserted into the processing hole H, and the trigger 20 is pulled. As a result, the fan 36 rotates by the drive of the motor 30, and the air flow AR flows into the air flow path 60A of the depth gauge 60 from the rear end opening of the inner gauge 62. The air flow AR flows in the air flow path 60A toward the contact portion 77A of the tip gauge tube 77 and is exhausted from the contact portion 77A. Thereby, the dust and the like remaining in the processing hole H are swept out to the outside of the processing hole H by the air flow AR exhausted from the contact portion 77A. As a result, the dust and the like remaining in the processing hole H can be removed using the depth gauge 60.

[0056] Next, another drilling method for the workpiece W will be described with reference to FIG. 12. In this drilling process, a tape or the like serving as a guide for the drilling depth is attached to the outer peripheral portion of the bit BT. Then, the drilling process is performed while an operator visually checks whether or not the tape has reached the surface of the workpiece W. Further, in this process, in the outer gauge 70, the tip gauge tube 77 is rotated to the left with respect to the base gauge tube 71. Also, when viewed from the front, the base gauge tube 71 is rotated counterclockwise with respect to the second inner tube 66. As a result, the contact portion 77A of the tip gauge tube 77 approaches the bit BT, and the opening of the contact portion 77A is arranged so as to face the bit BT side. For this reason, the air flow AR exhausted from the contact portion 77A is exhausted toward the bit BT, and the dust accumulated around the bit BT can be blown away by the air flow AR. As a result, the tape serving as a guide for the drilling depth can be confirmed well.

[0057] Here, in the hammer drill 1, at least a part of the depth gauge 60 is accommodated in the accommodation chamber 12A of the housing 10, and the other part of the depth gauge 60 extends forward from the housing 10 so as to be able to contact the workpiece W. Specifically, the inner gauge 62 of the depth gauge 60 is accommodated in the accommodation chamber 12A of the main body housing portion 12, and the outer gauge 70 of the depth gauge 60 is supported by the inner gauge 62 and extends forward from the housing 10. Thereby, compared with a configuration in which the entire depth gauge 60 is disposed outside the housing 10, the size of the hammer drill 1 including the depth gauge 60 can be reduced. Therefore, the workability of the hammer drill 1 can be improved.

[0058] Also, when viewed from the front, the entire outer gauge 70 overlaps the main body housing portion 12. Thereby, the depth gauge 60 can perform the drilling process on the workpiece W without protruding to the outer side in the left - right direction and the outer side in the up - down direction of the main body housing portion 12. Therefore, the workability of the hammer drill 1 can be further improved.

[0059] Further, the second inner tube 66 of the inner gauge 62 in the depth gauge 60 is housed in the second housing chamber 12A2 that houses the power transmission mechanism 40. And, when viewed from the front, the second inner tube 66 is disposed on the right side of the overlapping portion 40A between the reciprocating bearing 49 and the cylinder gear 53, and the second inner tube 66 and the overlapping portion 40A are arranged side by side in the left - right direction. Specifically, when viewed from the front, the second inner tube 66 is disposed in the dead space DS formed on the right side of the overlapping portion 40A. Thereby, by effectively utilizing the dead space DS that is not utilized for housing the power transmission mechanism 40, the second inner tube 66 can be provided in the second housing chamber 12A2. Therefore, the inner gauge 62 can be housed in the main body housing portion 12 while suppressing an increase in the size of the main body housing portion 12.

[0060] Further, the depth gauge 60 includes an inner gauge 62 housed in the main body housing portion 12 and an outer gauge 70. In the outer gauge 70, the base - end gauge tube 71 is disposed inside the second inner tube 66 of the inner gauge 62 and is supported by the second inner tube 66 so as to be movable in the front - rear direction. Also, in the outer gauge 70, the tip - end gauge tube 77 extends in the front - rear direction outside the housing 10, and the tip - end portion of the tip - end gauge tube 77 is the contact portion 77A. Thereby, the depth gauge 60 can be configured to be telescopic with a simple structure.

[0061] Also, both the inner gauge 62 and the outer gauge 70 are formed in a tubular shape. The inside of the depth gauge 60 (inner gauge 62 and outer gauge 70) is an air flow path 60A that allows the air flow AR generated by the fan 36 to flow toward the opening side of the contact portion 77A, and the air flow AR is exhausted from the opening of the contact portion 77A. Thereby, as described above, for example, dust and the like remaining in the processing hole H formed in the workpiece W can be swept out by the air flow AR exhausted from the opening of the contact portion 77A. Therefore, the depth gauge 60 can be utilized to perform a dust removal operation. Thus, the workability during drilling can be further improved.

[0062] Further, the depth gauge 60 is configured to be able to change the orientation of the opening of the contact portion 77A. Specifically, the outer gauge 70 includes a base-end gauge tube 71, a tip-end gauge tube 77, and a connecting tube unit 72. The base-end gauge tube 71 is movably provided within the second inner tube 66 of the inner gauge 62, and the tip end of the tip-end gauge tube 77 serves as the contact portion 77A. Also, the rear end portion of the tip-end gauge tube 77 is connected to the front end portion of the base-end gauge tube 71 by the connecting tube unit 72 so as to be relatively rotatable about the vertical direction as the axial direction. Thus, as described above, by relatively rotating the outer gauge 70 with respect to the inner gauge 62, it is possible to perform operations such as removing dust within the machining hole H formed in the workpiece and removing dust accumulated around the bit BT.

[0063] Further, a communication hole 12G that communicates the inside of the first accommodation chamber 12A1 with the outside of the housing 10 is formed in the raised portion 12B of the main body housing portion 12. And in the state where the depth gauge 60 is stored, the contact portion 77A of the depth gauge 60 is inserted into the communication hole 12G, and the air flow path 60A of the depth gauge 60 communicates with the first accommodation chamber 12A1. Thus, when the depth gauge 60 is not in use, a part of the outer gauge 70 in the depth gauge 60 can be stored within the main body housing portion 12 during drilling. Also, the air flow AR flowing through the air flow path 60A of the depth gauge 60 can be made to flow out into the first accommodation chamber 12A1 and exhausted from the exhaust port 12D of the first accommodation chamber 12A1 to the outside of the housing 10.

[0064] (Regarding a modified example of the depth gauge 60) Next, a modified example of the depth gauge 60 will be described with reference to FIGS. 13 to 15. In FIGS. 13 to 15, the same reference numerals are given to portions having the same configuration as the depth gauge 60 of the present embodiment.

[0065] In a modification of the depth gauge 60, in the outer gauge 70 of the depth gauge 60, the connecting pipe unit 72 and the tip gauge pipe 77 are omitted, and the outer gauge 70 is composed of only the base end gauge pipe 71. The length of the base end gauge pipe 71 in the front-rear direction is longer than that in the present embodiment, and the tip portion of the base end gauge pipe 71 is the contact portion 71A. The base end gauge pipe 71 is detachably inserted into the second inner pipe 66 of the inner gauge 62.

[0066] In the state where the base end gauge pipe 71 is removed from the second inner pipe 66, the base end gauge pipe 71 is held by the side handle 18 above the main body housing portion 12. Specifically, as also shown in FIG. 2, a slit 18B that extends in the vertical direction and penetrates in the front-rear direction is formed in the handle attachment portion 18A of the side handle 18, and the upper end portion of the slit 18B is open upward. The right side portion of the slit 18B in the handle attachment portion 18A is the support piece 18C, and the support piece 18C is configured to be elastically deformable in the left-right direction. A holding groove 18D that is open to the left is formed at the upper end portion of the support piece 18C. Then, the base end gauge pipe 71 is arranged along the front-rear direction, and the front end portion of the base end gauge pipe 71 is inserted into the holding groove 18D from the rear side. Thereby, the base end gauge pipe 71 is sandwiched from both sides in the left-right direction by the support piece 18C and the handle attachment portion 18A, and the base end gauge pipe 71 is held by the side handle 18 (see FIG. 15).

[0067] Also, as shown in FIGS. 14(A) and (B), a valve 84 is provided between the fixture body 81 and the front end portion of the second inner tube 66. The valve 84 is configured to be able to open and close the air flow path 60A at the front end portion of the second inner tube 66. Specifically, when the base end gauge tube 71 is removed from the second inner tube 66, the air flow path 60A is closed by the valve 84. On the other hand, when the base end gauge tube 71 is attached to the second inner tube 66, the valve 84 is pushed outward in the radial direction of the second inner tube 66 by the base end gauge tube 71, and the air flow path 60A is opened. Thereby, when the depth gauge 60 is not in use, it is possible to suppress the exhaust of the air flow AR from the fixture 80 to the outside of the housing 10.

[0068] And also in the modified example of the depth gauge 60, the inner gauge 62 of the depth gauge 60 is housed in the housing chamber 12A, and the base end gauge tube 71 of the depth gauge 60 is supported by the second inner tube 66 of the inner gauge 62 and extends forward from the housing 10. Thereby, similar to the present embodiment, compared with the configuration in which the entire depth gauge 60 is arranged outside the housing 10, the size of the hammer drill 1 including the depth gauge 60 can be reduced. Therefore, the workability of the hammer drill 1 can be improved.

[0069] Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof.

Explanation of Reference Numerals

[0070] 1 Hammer drill (working machine) 10 Housing 12A Housing chamber 12A1 First housing chamber 12A2 Second housing chamber 12D Exhaust port 12G Communication hole 30 Motor 36 Fan 40 Power transmission mechanism 40A Overlapping portion 41 First power transmission mechanism portion (first mechanism portion) 49 Reciprocating bearing (first annular member) 50 Second power transmission mechanism section (second mechanism section) 53 Cylinder gear (second annular member) 60 Depth gauge (auxiliary mechanism) 62 Inner gauge (fixed-side member) 70 Outer gauge (movable-side member) 71 Base-end gauge tube (base-end side movable part) 72 Connecting tube unit (connecting part) 77 Tip gauge tube (tip-side movable part) BT Bit (tip tool) W Workpiece

Claims

1. A housing having an accommodation chamber therein, A motor accommodated in the accommodation chamber, A tip tool extending from one side of the housing in a first direction and rotating with the first direction as the axial direction by the driving force of the motor, A power transmission mechanism accommodated in the accommodation chamber and transmitting the driving force of the motor to the tip tool, An auxiliary mechanism at least a part of which is accommodated in the accommodation chamber, extending from the housing to one side in the first direction so as to be able to contact the workpiece, and assisting the operation of the tip tool with respect to the workpiece, A working machine provided with the above.

2. The auxiliary mechanism is configured to be extendable and retractable in the first direction, When the auxiliary mechanism contacts the workpiece, it indicates to the operator that the separation distance between the housing and the workpiece has reached a set distance, The working machine according to claim 1, wherein the set distance is changed by the expansion and contraction of the auxiliary mechanism.

3. The accommodation chamber has a first accommodation chamber for accommodating the motor and a second accommodation chamber for accommodating the power transmission mechanism, The working machine according to claim 2, wherein at least a part of the auxiliary mechanism is accommodated in the second accommodation chamber.

4. The power transmission mechanism has a first mechanism part and a second mechanism part, and the second mechanism part is located on one side in a second direction orthogonal to the first direction with respect to the first mechanism part, The first mechanism part has a first annular member constituting the outermost periphery of the first mechanism part when viewed from the first direction, The second mechanism part has a second annular member constituting the outermost periphery of the second mechanism part when viewed from the first direction and overlapping the first annular member, The working machine according to claim 3, wherein, when viewed from the first direction, the portion of the auxiliary mechanism accommodated in the second accommodation chamber is arranged side by side in a third direction orthogonal to the second direction with the overlapping portion of the first annular member and the second annular member.

5. The auxiliary mechanism is, A tubular fixed-side member disposed inside the accommodation chamber and supported by the housing, A contact portion whose one end portion contacts the workpiece at the set distance, and a movable-side member whose other end-side portion is disposed inside the fixed-side member and supported by the fixed-side member so as to be movable in the first direction, The working machine according to claim 2, which is configured to include the above.

6. A fan is accommodated in the accommodation chamber, and an air flow is generated by the rotation of the fan by the driving force of the motor, The movable side member is formed in a tubular shape, and the interiors of the fixed side member and the movable side member are air flow paths for flowing the air flow in the accommodation chamber to the contact portion. The working machine according to claim 5, wherein the air flow is exhausted from the opening of the contact portion.

7. The working machine according to claim 6, wherein the movable side member is configured to be able to change the orientation of the opening in the contact portion.

8. The movable side member has a base end side movable portion that extends in the first direction and is movably provided inside the fixed side member, a tip end side movable portion that extends in the first direction outside the housing and has the contact portion at the tip end, and a connecting portion that connects the tip end portion of the base end side movable portion and the base end portion of the tip end side movable portion, and connects the tip end side movable portion to be relatively rotatable with respect to the base end side movable portion with the second direction orthogonal to the first direction as the axial direction. The working machine according to claim 7, comprising:

9. An exhaust port for exhausting the air flow and a communication hole for communicating the inside and outside of the housing are formed in the accommodation chamber. The contact portion of the tip end side movable portion that is relatively rotated with respect to the base end side movable portion and extends to the other side in the first direction from the connecting portion is inserted into the communication hole, and the air flow path communicates with the inside of the accommodation chamber. The working machine according to claim 8.

10. A fan is accommodated in the accommodation chamber, and an air flow is generated by the rotation of the fan by the driving force of the motor. The auxiliary mechanism is formed in a long tubular shape and has an air flow path for flowing the air flow in the accommodation chamber to the tip end side, and exhausts the air flow from the opening at the tip end. The working machine according to claim 1.

11. A housing having an accommodation chamber inside, a motor accommodated in the accommodation chamber, a fan rotated by the driving force of the motor, a tip tool that extends from the housing to one side in the first direction and rotates with the first direction as the axial direction by the driving force of the motor, a power transmission mechanism that is accommodated in the accommodation chamber and transmits the driving force of the motor to the tip tool, and an auxiliary mechanism formed in a tubular shape for exhausting the air flow generated by the fan toward the workpiece. The working machine is provided with The auxiliary mechanism is a working machine in which at least a part thereof is accommodated in the accommodation chamber and extends from the housing to one side in the first direction.

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