JPS60114474A - 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 vibrating drill shown in FIG. 1 has been used. That is, the rotation of the motor 71 is decelerated and transmitted to the ratchet 74 via the pinion 72 and the reduction gear 73, and the ratchet 74 is engaged with the fixed ratchet 76 by the pressing reaction force acting on the output shaft 75 to give slight vibrations. This is what I did.

However, since the motor shaft 711L and the output shaft 75 are not in a straight line, a dead space is created in the housing 77, and the body of the housing 77 is thick.

Therefore, the bit attached to the output shaft 75 becomes difficult to see, making it difficult to use, and since it becomes thick, the bit becomes heavy and easy to overlap during long hours of work.

In addition, as shown in Fig. 2, the bit tip P, which is the support point of the drill, and the grip load point R are separated by the amount of positional deviation between the motor shaft 71B and the bit shaft 75, and the center of gravity G
The coupled moment l-M increases, making it unstable to hold the drill during use, making it inconvenient to use. That is, if the motor shaft 71B and the bit shaft 75 are not on a straight line but deviate by ε, Ll will increase by ε, and therefore the moment M generated in the drill during use will also increase. Note that F is the bit pressing force, C is the reaction force thereof, and W is the drill thrust force by the operator.

Furthermore, conventionally, an air hammer type vibrating drill has been used, but this also has the same problem as above because the motor axis and the bi, + and - axes are misaligned.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a photographic drill that is easy to use because the tip of the bit is easy to see during drilling work, is small and lightweight, and is not tiring even during long hours of work.

[Disclosure of the invention]

In the vibration drill of the present invention, the rotating shaft of the motor, the hammer, and the output shaft are arranged on the same axis.

Embodiment An embodiment of the present invention is shown in FIGS. 3 to 7. In the figure, reference numeral 1 denotes a housing, which consists 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 arranged and housed on the same axis in the cylindrical part 1a, and a deceleration shaft 7 is housed parallel to the axis. A bulging part 1b1i is provided in the cylindrical part 1a adjacent to the battery storage chamber 3, and a switching mechanism 8 between a drill function and a drill hammer function is housed in this bulging part 1b. A chuck 10 is attached to which the output shaft 61'i bit 9 is attached, and is supported by a bearing 11 at the tip of the housing 1 so as to be rotatable and movable forward and backward. 12 is a bearing stand.

The rotation transmission mechanism will be explained. The reduction shaft 7 is supported by a bearing 13 and a metal bearing 14 at both ends (5), and a first reduction gear 15 and a pinion 16 are provided at both ends. 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 reduction 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. Eighteen gear fixing rings are secured to the spline groove 20 of the output shaft 6 by balls 21. A bearing 13 at one end of the deceleration shaft 7 is provided on a 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 striking mechanism will be explained. A guide cylinder 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 the driver 27 at one end of the forward/backward shaft 26 is housed therein.

28 is a cylinder cap. The hammer 5 has a recess into which the rear end of the output shaft 6 is fitted so as to be movable in the axial direction. The hammer 5 and the driver 27 are connected by a spring 29. Advance/retreat axis 26
is supported by a metal bearing 31 in the motor fixing base 22 so as to be able to move forward and backward. Advance/retreat axis 26f
It is connected to an i-drive ring 32, and the drive ring 32 has a long 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 pin 33 has a roller 34 on its outer periphery. The eccentric pin 33 is fixed to a pair of eccentric shafts 35 and 36. The eccentric shafts 35, 36 are supported on the motor fixing base 22 by bearings 37, 38.

A bevel gear 39 is fixed to one eccentric shaft 36, and rotation is transmitted from the deceleration shaft 7 via a bevel gear 40 that meshes with the bevel gear 39.

The switching mechanism 8 will be explained. As shown in FIG. 5, the bevel gear 40 is engaged with the deceleration shaft 7 by a sliding key 41, and a key moving plate 43 that slides the key 41 into and out of the key groove 42 of the bevel gear 40 is attached to the key 41. It is a combination. Key moving board 4
3 is attached to the guide groove 44 of the housing 1. The key moving plate 43 is engaged with a switching handle 45 that is slidably provided with a portion protruding from the housing 1, and
It is pressed at 7. The switching handle 45 has a guide (7
) is attached to the groove 46. The bevel gear 40 is provided with a key fall prevention ring 4011.

In addition, the battery 48 is held down inside the battery housing chamber 3 by a battery cover 49. 50 is a contact metal fitting that contacts the terminal plate 48B of the battery 48, and 51 is a switch. The switch handle 52 is arranged at the axis Li of the motor 4. 53 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 reduction shaft 7. Further, the rotation of the motor 4 is controlled from the deceleration shaft 7 to the bevel gear 3.
9.40, 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. Figure 6 (
5) to (to) and FIG. 7 show the striking motion. 6-D) show the states of w-(D) in FIG.

Explain the principle of hitting. Normally, when considering a combination system (8) of a mass body m, a spring-like number, and a resistor C as shown in FIG. 8, the frequency characteristics of the amplitude will be as shown in FIG. Here, Xo = amplitude of the driving piston (ff),
The amplitude of the XI hammer (*w), ω; the driving angular velocity frequency is ω. Set the specifications so that σ is satisfied. Thereby, the impact energy at the time of impact can be relaxed by the phase difference. In FIG. 9, l indicates the operating range considering buffering. The phase difference at this time also depends on the value of the attenuation rate, so ζ;
If it's around 0.1, oh. = 1.5 to 2, approximately 10
The phase difference is about 0 to 130 degrees. The operating state diagram of the hammer 5 (FIG. 6) illustrates the operation of the hammer 5 with a phase difference between the holes.

Switching between rotation and rotational impact will be explained.

When the switching handle 45 is moved to the right as shown in FIG. 5 CB), the key 41 is also moved to the right by the key moving plate 43. When the key 41 is removed from the keyway 42 of the bevel gear 40, the rotation of the deceleration shaft 7 is not transmitted to the bevel gear 40 due to idle rotation of the key 41. (9) 7M6, the hammer 5 does not reciprocate, and only rotation is transmitted to the drill bit 9. When the key 41 is idle, the key fall prevention ring 408 provided on the bevel gear 40 prevents the key 41 from coming off and falling off the deceleration shaft 7 and the bevel gear 40, and also allows the next key 41 to be inserted smoothly. It will be held in

When inserting the key 41, move the switching handle 45 to the left as shown in Figure 5.

It works this way, but has the following advantages: ■Motor 4
Since the hammer 5 and the output shaft 6 are arranged on the same axis, there is no dead space in the cylindrical portion la of the housing 1, and the diameter of the cylindrical portion 1a can be reduced. Therefore,
During drilling work, the bit 9 and the tip of the bit 9 are easy to see and easy to use.

In addition, since the diameter of the cylindrical portion 1a can be made thinner, it can be made smaller and lighter, so that even if you hold it for a long time, you will not get tired. Furthermore, since all the pressure at the time of impact is reflected on the same axis,
There is no horizontal movement due to the reaction force of the entire housing 1, and it is only necessary to press in the axial direction, making it easy to use and not tiring. ■ Place the switch handle 5 on the axis where the motor 4 (10) and hammer 5 are lined up.
2, the fingertips operating the switch handle 52 face toward the bit 9, making it easier to work. Furthermore, since the housing 1 is pushed from the rear side of the switch handle 52 as shown by the arrow Q in FIG. 3, the housing 1 does not fall over and accurate drilling work can be performed. ■Since the battery storage chamber 3 is overlapped with a part of the cylindrical part 1a of the housing 1, the center of gravity in the vertical direction is closer to the axis of the bit 9, so that the housing l will not fall over when pressed during drilling. , can perform accurate drilling work. ■First reduction gear 1
Since the switching mechanism 8 between a drill and a hammer drill is placed in the bulging part 1b of the cylindrical part 1a that accommodates the cylindrical part 1, the switching mechanism 8 can be accommodated without the need to further increase the diameter of the cylindrical part 1&, making it compact and easy to use. .

A switching handle 45 is attached to the slightly protruding bulge 1b of the cylindrical portion 1a.
is located, so the switching operation can be performed and it is easy to make a fake. ■The transmission of power is switched by attaching and detaching the key 41, and the hammer 5 is not operated when only the drill is used. This is different from the case where the hammer 5 is made to miss and the output shaft 6 only rotates. The energy for reciprocating the battery 48 becomes unnecessary, and the energy of the battery 48 can be used effectively.

FIG. 10 shows another embodiment. In this example, the battery 54 is arranged on the axis of the motor 4 and the machining bits 9 arranged side by side. That is, the housing 1 is provided with a battery housing chamber 3' that protrudes further rearward than the motor 4, and the battery 54 is housed therein via a battery case 55. battery case 55
The hook 5G engages with the engagement hole 57 of the housing 1' and is prevented from coming off. The grip 2' is provided to protrude downward from the cylindrical portion la of the housing 1'. The other configurations are similar to the first embodiment.

In this way, since the battery 54 is disposed together with the motor 4 on the extension of the axis of the bit 9, the center of gravity is approximately on the axis of the bit 9, and the impact reaction force during drilling is suppressed by the full weight. It will be done. Therefore, there is a slight loss of energy. Furthermore, since no moment is applied to the housing 1' side during work, the angular deformation of the material can be maintained accurately, allowing accurate drilling work.

This will be discussed later. In this vibration drill, which drills a hole while crushing concrete by hitting the bottom of the bit 9 with a hammer 5, a constant reaction force fB is always returned to the housing 11- side when hitting concrete. At this time, the human body holding the housing 1' ultimately applies a thrust force fP to the housing 1' to absorb this reaction force fE.
′. Usually fP=fB. However, when the weight of the housing 1' is light, α□ of fB=mα, (m is the mass of the housing 1′, α1 is the acceleration due to the reaction force) increases, and the amplitude of the vibration due to the reaction force increases. growing. When the amplitude becomes large, the vibration applied to the human body becomes large, which is undesirable because it causes discomfort to the user during work.

Therefore, by placing the center of gravity of the battery 540 on the bit axis, the entire weight of the housing 1' will receive the reaction force, which will result in less vibration for the operator, and the energy will be transferred at right angles to the bit. Since the signal is transmitted in the direction, the amount of transmission due to falling can be reduced.

FIGS. 11 to 13 show still other embodiments. In this example, a battery housing chamber 3' (13) is provided around the outer periphery of the motor 4, and a battery 58 is housed therein. 59 is a battery charging terminal. A plurality of batteries 58 may be provided as shown in FIG. 12, or may be cylindrical as shown in FIG. 13.

With this configuration, the battery 58 is warmed by the heat generated by the motor 4 during use, and the discharge efficiency of the battery 58 is improved. Therefore, it is possible to prevent a decrease in power and a decrease in battery life, especially in winter. The rest is the same as the first embodiment.

[Effects of the Invention] The vibratory drill of the present invention has the advantage that the bit and the tip of the bit are easy to see during drilling work, making it easy to use, and it is also small and lightweight, making it less tiring to work for long periods of time.

[Brief explanation of drawings]

Fig. 1 is a cutaway side view of the conventional example, Fig. 2 is an explanatory view of its operation, Fig. 3 is a longitudinal sectional side view of an embodiment of the present invention, Fig. 4 is a sectional view taken along the line IV-■ in Fig. 3, Fig. 5 (A) [F]) is an explanatory diagram of the switching operation, Fig. 6 - 0 is an explanatory diagram of the striking operation, and Fig. 7 is an explanatory diagram of the phase of the hammer and piston (14). , Figure 8 is a diagram explaining the principle, Figure 9 is an amplitude diagram of the same principle, and Figure 1 is a diagram explaining the principle.
Fig. 0 is a vertical side view of another embodiment, Fig. 11 is a longitudinal side view of yet another embodiment, Fig. 12 is a sectional view taken along line x-1 of Fig. 11, and Fig. 13 is a modification of the same cross section. FIG. 1.1', 1'...Housing, 1a...Cylinder part, 1
b...Bulging part, 2...Grip, 3...Battery chamber, 4...Motor, 5...Hammer, 6...High force shaft, 7...Deceleration shaft, 8 ...Switching mechanism, 9...Bit, 10...Chuck, 15...First reduction gear, 1
9... Second reduction gear, 25... Guy F cylinder,
26... Forward/backward glaze, 27... Drive element, 29... Spring, 33... Eccentric pin, 39.40... Bevel gear, 41
...Key, 45...Switching handle, 52...Switch handle, L...Axis center JP-A-114474(6) Procedural amendment (Spontaneous 1. Indication of incident 1988 Patent Application No. No. 218469 No. 2, Name of the invention Vibration drill 3, Person making the amendment Relationship to the case Applicant 4, Agent 5, Date of amendment order Voluntary amendment 6, Description and drawings to be amended 7, Contents of amendment (1) On page 6, line 3 of the specification, the phrase “fixed” is corrected to “fixed.” (2) On page 8, line 20 of the specification, “spring-like number k” is changed to “fixed”. (2) JP-A-114474 (10)

Claims (1)

[Scope of Claims] (1) The rotating shaft of the motor, the pinion fixed to the rotating shaft, the hammer that reciprocates by receiving drive from the rotating shaft, and the output shaft driven by this hammer are aligned on the same axis. a deceleration shaft is disposed above and parallel to the axis, and the deceleration shaft is provided with first and second deceleration means that mesh with the pinion of the motor rotation shaft and the output shaft, and these deceleration means A vibrating drill, wherein a hammer drive means for reciprocating the hammer is provided in the middle of the hammer, and a housing chamber for housing a power supply section of the motor is provided in a housing housing all of the components. (2) The vibratory drill according to claim (1), wherein the power supply unit includes a battery, and the battery is arranged on the same center as the rotating shaft, hammer, and output shaft of the motor. (3) The vibration drill according to claim (1), wherein a grip is formed on the housing, the grip intersects with the deceleration shaft, and the power source is provided within the grip. (4) The hammer drive means is provided with means for switching between a drill function that causes the output shaft to perform only rotation, and a hammer F drill function that causes the output shaft to perform rotation and impact. ) Vibratory drill as described in section. (5) The vibration drill according to claim (1), wherein a switch operator for turning on and off the motor is disposed on the same axis as the axis on which the rotary shaft of the motor and the hammer are disposed. (6) A portion of the housing that accommodates the hammer, the output shaft, and the deceleration shaft is cylindrical, and a portion of the grip that accommodates the battery is partially overlapped with the cylindrical housing portion. The vibration drill according to claim (3). (7) A portion of the housing that accommodates the hammer, the output shaft, and the deceleration shaft is cylindrical, and the first portion of the cylindrical portion 4. The vibration drill according to claim 4, wherein a bulge is provided in a portion that accommodates the deceleration means and the hammer drive means, and the switching means is disposed in the bulge.