JPS60177881A - Vibrating drill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 〔Technical field〕 This invention relates to a vibrating drill.

[Background technology]

Conventionally, a piston hammer type vibratory drill shown in FIGS. 7 and 8 (Japanese Patent Publication No. 46161/1983) has been proposed as a vibratory drill. This converts the rotation of the motor 71 from the eccentric camshaft 72 to the crankshaft 73 into a reciprocating motion of the piston 74, and the piston 74 transmits the reciprocating motion to the free-wheel-driver 76 through the air chamber 75'lf.
is configured to apply a blow to the bottom of the output shaft 77. On the other hand, by another mechanism, rotation is transmitted from the same mortar 71 to the output shaft 77, and the output shaft 77 is configured to drill a rock or concrete IJ (7 holes) by the action of a so-called rotary impact. There is.

When only rotation is required, only the rotation is transmitted by shifting the position of the output shaft 77 so that the hammer 76 does not hit the output shaft 77. FIG. 8(A), IJ3) shows the case where both rotation and vibration are applied. In Fig. 8 (5), piston 4
In FIG. 8(B), the piston 74 is at the top dead center. When the piston 74 reaches the dead center on the road, the hammer 76 hits the output shaft 77 before reaching the top dead center of the hammer 76, giving impact energy to the output shaft 7. FIG. 8(C) shows the case where only rotation is applied. The output shaft 77 is also shifted from the top dead center of the hammer 76, so that the hammer 76 does not hit the output shaft 77 and does not transmit vibrations.

However, even when drilling is performed by rotation only, the hammer 76 is reciprocated for impact drilling, so even when only the rotation function is required, the power required to produce the impact function is consumed. Further, there is a problem in that noise is generated due to the sliding movement of the piston 74 and the hammer 76.

Therefore, we proposed a system in which a clutch means is provided in the transmission path from the motor to the hammer (Japanese Patent Application No. 58-218469
issue). According to this, the hammer does not operate when drilling is performed only by rotation, and power consumption is reduced. However, when drilling with rotary impact, the hammer operates between the time the motor is activated and the bit is just about to hit the drilling material, resulting in a dry hitting state, and the power used to drive the hammer is wasted. There was a drawback that In particular, in the case of a battery-powered type, power is wasted in this way, and the number of holes that can be drilled decreases.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a vibratory drill that can eliminate unnecessary power consumption by preventing blank firing until the focus hits the object to be drilled.

[Disclosure of the invention]

The vibratory drill of the present invention is provided with a clutch means in the path for transmitting drive to the hammer, and the clutch means is brought into contact with and separated from it by a retractable rod that projects slightly beyond the tip of the bit.

When the focus is pressed against the drilling material, the rod retracts and engages the clutch, causing the hammer to begin striking.

Embodiment An embodiment of the present invention is shown in FIGS. 1 to 6. In the figure, 1 is a housing consisting of a cylindrical portion 1a, a grip 2 extending to the rear end, and a battery storage chamber 3 provided overlapping the rear end of the cylindrical portion 1a.

A motor 4, a hammer 5, and an output shaft 6 are housed in the cylindrical portion 1a, aligned on the same axis, and an intermediate shaft 7 is housed in parallel to the axis. A bulging part ibl is provided in the cylindrical part 1a adjacent to the battery storage chamber 3, and a clutch means 8 for switching between a drill function and a drill hammer function and for preventing dry firing is housed in this bulging part 1b. The output shaft 6 is made up of several chucks IO to which the bit 9 is attached, and is supported by a bearing 11 at the tip of the housing 1 so that it can rotate and move back and forth. 12 is a bearing stand.

The rotational drive means will be explained. The intermediate shaft 7 is supported by a bearing 13 and a metal bearing 14 at both ends, and has a first shaft at both ends.
A reduction gear 15 and a pinion 16 are provided.

The first reduction gear 15 is fixed to the rotating shaft 4a of the motor 4 and meshes with the pinion 17. A pinion 16 at the tip of the intermediate shaft 7 meshes with a second reduction gear 19 fixed to a gear fixing ring 18 on the outer periphery of the output shaft 6 . The gear fixing ring 18 is engaged with a spline groove 20 of the output shaft 6 by a ball 21. The bearing 13 at one end of the intermediate shaft 7 is
It is provided on the motor fixing base 22.

The motor fixing stand 22 is screwed to a clamp bearing stand 24 which is fixed to the housing 1 with bolts and nuts 23.

The reciprocating drive means will be explained. A guide shuffling ring 25 is fixed to the motor fixing base 22, and the hammer 5 is fitted into the guide cylinder 25 so as to be movable in the axial direction, and a driver 27 at one end of the forward/backward shaft 26 is housed therein. 28 is a cylinder cap. The hammer 5 has four parts into which the rear end of the output shaft 6 is inserted so as to be movable in the axial direction. Hammer 5 and driver 27
Connect with a toke spring 29. The forward/backward axis 26 is the motor fixing base 2
It is supported by a metal bearing 31 inside 2 so that it can move forward and backward. The forward and backward shaft 26 is connected to a drive ring 32, and the drive ring 32 has an elongated hole through which an eccentric pin 33 passes. This elongated hole extends long in a direction perpendicular to the forward/backward axis 26. The eccentric bin 33 has a roller 34 on its outer periphery. Eccentric bottle 33
are fixed to a pair of eccentric shafts 35 and 36. The eccentric shafts 35 and 36 are supported on the motor fixing base 22 by bearings 37 and 38. One eccentricity +11136 is the bevel gear 3
9 is placed on a stand, and rotation is transmitted from the intermediate shaft 7 via a bevel gear 40 that meshes with the stand.

Clutch means 8 (il-explained. A bevel gear 40I'i is engaged with the intermediate shaft 7 by a sliding key 41, and a switching ring 43 that slides the key 41 to engage and disengage from the keyway 42 of the bevel gear 40 is the key. It is connected to 41.

There are only a few switching rings 43 in the guide groove 44 of the housing 1. Switching ring 43#-1:,) is pressed by a spring 47 against the inner surface of a switching case 46 that is slidably fitted into the guide hole 45 of the housing 1.

The switching case 46 is pressed toward the rear of the housing 1 by a spring 48 in the guide hole 45. A changeover switch 49 is located behind the changeover case 46 and is slidably and rotatably provided in a guide groove 50 of the housing 1, and a weak spring 51 is interposed between the changeover case 46 and the changeover switch 49. . A portion of the changeover switch 49 protrudes from the housing 1, and a rotational locking groove 52 for stopping the changeover switch 49 from sliding and a rotational impact locking groove 53 are provided in the housing 1 separated from each other in the front and back. . Switching case 46
A rod 54 for preventing dry firing is inserted into the guide hole 45 into which the
The proximal end of the rod 54 is inserted, and the rod 54 is supported by the hole of the support protrusion 55 of the housing 1 and the small hole 45a at the entrance of the guide hole 45 so as to be freely protrusive and retractable. The rod 54 has a flange 54a with which the spring 48 that presses the switching case 46 engages.
f, and is biased to protrude by a spring 48. rod 54
It consists of a small diameter shaft 56 and a cylindrical cap 57 fitted thereto, and its length can be freely adjusted and fixed with a set screw 58. The tip of the rod 54 is adjusted to a position slightly protruding from the tip of the bit 9. Further, a bud hole depth determining ring 59 is fitted onto the rod 54 and can be repositioned to an arbitrary length position with a set screw 60.
A portion 61 of the stopper receiver that engages with the housing 9 is formed on the housing 1.

In addition, the battery 62 is held down inside the battery housing chamber 3 by a battery cover 63. 64 is a contact metal fitting that contacts the terminal plate 62a of the battery 62, and 65 is a switch. The switch handle 66 is arranged on the axis of the motor 4. 6
7 is a protrusion provided on the housing 1 to prevent the hand from slipping.

The rotation of the operating motor 4 is transmitted to the output shaft 6 via the intermediate shaft 7. Further, the rotation of the motor 4 is controlled from the deceleration shaft 7 to the bevel gear 3.
9 and '40, and is converted into a forward/backward movement of the forward/backward shaft 26 by the eccentric bin 33. The forward and backward movement of the forward and backward shaft 26 is transmitted to the hammer 5 via the driver 27 and the spring 29, and the hammer 5 strikes the output shaft 6 by its reciprocating motion.

The dry firing prevention and switching operation will be explained. When drilling by rotation only, the changeover switch 49 is engaged with the rotation locking groove 52 as shown in FIG. At this time, the key 41 is disengaged from the keyway 42 of the bevel gear 40, and the armature 5 is not driven, and the output shaft 6 and bit 9 only rotate. When the bit 9 hits the drilled object, the rod 54 hits the drilled object and the rod 54I'i is retracted. Therefore, rod 5
4 acts on the switching case 46, but since the switching case 46 is supported by the changeover switch 49, it does not move to the left in FIG.

Therefore, the switching ring 43 pressed against the switching case 46 by the spring 47 also does not move, and the key 41Fi held by the switching ring 43 is removed from the keyway 42 of the bevel gear 4o. Therefore, even if the intermediate shaft 7 rotates, the bevel gear 40 does not rotate and the hammer 5 is not driven.

When perforating by rotary impact, the changeover switch 49 is engaged with the rotary impact lock m53. At this time, the spring 51 stretches and presses the changeover switch 49 and the changeover case 46 with a small compressive force. When the switch 65 of the motor 4 is turned on to start drilling, the bit 9 is initially driven only in rotation, but a striking action is applied as follows. That is, when the bit 9 hits the drilling object or further advances to a predetermined depth, the rod 54 enters the housing 1 and causes a compressive force on the spring 48, which compressive force is added to the latent compressive force of the spring 51. Then, the switching case 46 is moved to the left as shown in FIG. At this time, the switching ring 43 moves to the left in the figure similarly to the switching case 46 due to the compressive force generated in the spring 47 provided in the switching case 46, and the key 41 enters the keyway 42 of the bevel gear 40 and is attached. . When a certain predetermined drilling depth is reached, key j1
completely enters the keyway 42 as shown in FIG.

Therefore, the rotation of the intermediate shaft 7 is controlled by the bevel gear 40. It is transmitted to the eccentric shaft 36 via the bevel gear 39, and the eccentric pin 33 and the eccentric shaft 35
．． This results in a reciprocating movement of the rod link 32 held by the rod link 36. This reciprocating motion is caused by the forward/backward shaft 26 and the spring 29.
- By transmitting the impact force to the hammer 5 and hitting the output shaft 6 with the hammer 5, an impact force can be applied to the bit 9.

Here, in order to perform the above-mentioned better operation, it is necessary that the spring constant I (A of the spring 51 and the spring constant K of the spring 48) satisfy KA≦Ko. 47 is a sliding resistance between the switching ring 41 (the switching ring 43 and the housing 1).
41 and the keyway 42).

In this way, in 1 where bit 9 corresponds to the perforated material, the hemma 5
The drive is not transmitted to the machine, and dry firing is prevented. Therefore,
No more wasted power consumption due to dry firing, just one battery 6
2 increases the number of holes.

Furthermore, even in the case of drilling only by rotation, the handle 75 is not driven, so power consumption is reduced. Furthermore, since dry firing is prevented in this way, there is no vibration noise caused by impact on the output shaft 6 and the guide cylinder 25 due to the vibration of the hammer 5. Further, the depth of drilling with the bit 9 is determined by the length of the rod 54 entering into the 7/Ujifugu 1, but the drilling depth determining ring 59 provided on the rod 54
By moving the ring 59 to a predetermined position using the set screw 60, the ring 59 engages with the stone bar receiving portion 61 of the housing 1, and the rod 54 is prevented from retracting. Therefore, the drilling depth is regulated. Note that if the ring 59 is not fixed with the set screw 60, the rod 54Vi will enter the compressed minimum length of the spring 48. Further, the length of the rod 54 corresponding to the difference in length of the focus 9 is determined by the length of the cylindrical cap 57.
The depth of the fit can be adjusted.

In the embodiment described above, the changeover switch 49 was used to switch between rotational rotation and rotational impact, but this switching does not necessarily have to be performed.

〔Effect of the invention〕

The vibratory drill of the present invention has the effect of preventing the bit from dry-driving until it hits the 7-hole object, thereby eliminating wasteful power consumption.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a partially enlarged sectional view thereof, Fig. 3 is an explanatory diagram of the operation only in the case of rotation, and Figs. 4 to 6 are similarly the rotation thereof. FIG. 7 is a cutaway side view of a conventional example, and FIG. 8 is an explanatory diagram of the operation when perforating by impact. l...Housing, 2...Grip, 4...Motor, 5...Hammer, 6...Output shaft, 7.Intermediate shaft, 8.
...Clutch means, 9...Bit, 10...Chuck, 25...Guide cylinder, 26...Advance/retreat axis, 33
...Eccentric bottle, 39.4-0...Bevel gear, 41...
・Key, 42...Keyway, 43...Switching ring, 46
...Switching case, 48...Spring, 49...Selector switch, 54...Rondo Agent, Patent Attorney, Officer Ii
husband

Claims (3)

[Claims] (1) A reciprocating drive means for reciprocating the bit by striking it with the hammer, a rotary drive means for rotating the bit, and a clutch interposed in the drive transmission path of the reciprocating drive means to the hammer. and a rod that projects slightly from the tip of the pit and is provided in the drill body so as to be freely protrusive and retractable so that the clutch is disengaged in the projecting state and connected in the retracted state. (2) A timepiece that is provided with a changeover switch that manually connects and disconnects the clutch means, and the clutch means is brought into a connected state when the changeover switch is in a connected state and the rod is in a retracted state. The vibration drill described in paragraph (1). (3) The vibration drill according to claim (1), wherein a stopper that engages with the rod to regulate the amount of retraction of the rod is attached to the drill body so that its position can be changed in the direction of movement of the rod.