JP2018161699A - Angle drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an angle drill having improved workability also in a narrow place by reducing a vertical dimension of a head part.SOLUTION: An angle drill 1 includes: a motor 5 having a motor shaft 14 oriented forward; an output shaft 38 rotatingly driven by rotation of the motor shaft 14 and extending in the vertical direction; a drill chuck 39 fixed to the output shaft 38; and a housing 2 having a motor housing part 4 in which the motor 5 is disposed and a front housing part 6 holding the output shaft 38. An upper surface 6a of the front housing part 6 is positioned under an upper surface 4a of the motor housing part 4.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an angle drill in which an output shaft provided with a tip tool holding portion is arranged in a vertical direction at a front end of a housing extending in the front-rear direction.

  As disclosed in Patent Document 1, the angle drill accommodates a motor in a housing extending in the front-rear direction, and arranges an intermediate shaft in the front-rear direction via a speed reduction mechanism in front of the motor. A spindle (output shaft) is arranged in the vertical direction via a bevel gear in front of the. A drill chuck (tip tool holding part) is provided at the lower end of the spindle.

JP 2009-90434 A

  In the conventional angle drill, a gear housing that holds an intermediate shaft and a spindle is connected in front of a motor housing that houses a motor, and an intermediate shaft is provided on the upper side of the motor shaft to form a speed reduction mechanism. Is made equal to the height of the upper surface of the motor housing. Therefore, the vertical dimension of the head part including the tip tool holding part becomes large, and there are cases where work in a narrow place cannot be performed.

  Therefore, an object of the present invention is to provide an angle drill capable of reducing the vertical dimension of the head portion and improving the workability in a narrow place.

In order to achieve the above object, the invention described in claim 1 is a motor having a motor shaft directed forward, an output shaft that is driven to rotate by rotation of the motor shaft, extends in the up-down direction, and is fixed to the output shaft. A housing having a tip tool holding portion, a motor housing portion in which the motor is disposed, and a front housing portion for holding the output shaft, the upper surface of the front housing portion being lower than the upper surface of the motor housing portion It is located.
In order to achieve the above object, the invention according to claim 2 includes a battery mounting portion provided at the rear end and capable of slidingly mounting a battery pack having a rated voltage of 7.2V to 18V from above and below, and the battery pack. A motor that is powered and extends in the front-rear direction, an output shaft that is rotationally driven by the motor and extends in the up-down direction, a tip tool holding portion that is fixed to the output shaft, a motor portion where the motor is disposed, and a tip tool holding portion A vertical length of the head portion is smaller than a vertical length of the battery pack held by the battery mounting portion.
In order to achieve the above object, a third aspect of the present invention is directed to a motor having a motor shaft directed forward, an output shaft that is driven to rotate by rotation of the motor shaft, and extends in the vertical direction, and is fixed to the output shaft. A tip tool holding portion, a speed reduction mechanism provided between the motor shaft and the output shaft, a housing having a motor housing portion on which the motor is disposed, a front housing portion for holding the output shaft, and a speed reduction in the housing A gear housing that holds a mechanism, and the gear housing includes a coaxial horizontal cylinder portion that is formed with an outer diameter of the motor or less, and a vertical cylinder portion that is provided at a front end of the horizontal cylinder portion and holds an output shaft. Are integrally provided.
According to a fourth aspect of the present invention, in the configuration of the third aspect, the speed reduction mechanism is coupled to a planetary gear disposed around a pinion provided on the motor shaft, a carrier that supports the planetary gear, and the carrier. And an intermediate shaft that is arranged coaxially with the motor shaft and transmits rotation to the output shaft.
According to a fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, a switch is disposed at the rear of the motor. A switch lever is provided which is located in the front and whose rear end is located below the switch.
According to a sixth aspect of the present invention, in the configuration of the fifth aspect, a forward / reverse switching lever of the motor is provided behind the switch.
According to a seventh aspect of the present invention, in the configuration according to any one of the first to sixth aspects, a convex portion protruding downward is provided behind the tip tool holding portion, and a lower portion of the tip tool holding portion is provided in the convex portion. A light for irradiating is provided.

  According to the present invention, the vertical dimension of the head portion can be reduced to improve workability in a narrow place.

It is a side view of an angle drill. It is a top view of an angle drill. It is a center longitudinal cross-sectional view of an angle drill. (A) is an AA line expanded sectional view, (B) is a BB line expanded sectional view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 are a side view, a plan view, and a central longitudinal sectional view showing an example of an angle drill. This angle drill 1 has a housing 2 that extends in the front-rear direction and is assembled by screws 3, 3,... At positions of screw bosses (not shown) provided on the inner surfaces of the left and right half housings 2a, 2b. The housing 2 includes a motor housing portion 4 as a motor portion that accommodates the motor 5 at a substantially center in the front-rear direction, a front housing portion 6 that accommodates the speed reduction mechanism 7 and the output portion 8 in front of the motor housing portion 4, A grip portion 9 that houses the switch 10 behind the motor housing portion 4 and a battery mounting portion 11 that mounts the battery pack 12 behind the motor housing portion 4 are provided.

The motor housing portion 4 has a cylindrical shape having the largest diameter, and holds the motor case 13 of the motor 5 with the motor shaft 14 facing forward. As shown in FIG. 4A, ribs 15, 15... For holding the outer surface of the motor case 13 are erected in the motor housing portion 4. Longitudinal protrusions 16, 16 that engage with recesses 17, 17 provided at the ends are erected to position the motor case 13.
A disc-shaped bracket 18 is fitted on the front surface of the motor case 13, and a pinion 19 is fixed to the tip of the motor shaft 14 that passes through the bracket 18 and protrudes forward. Further, a fan 20 is provided at the rear end of the motor shaft 14. A plurality of air outlets 21, 21,... Are formed on the outer periphery of the fan 20 in the motor case 13, and an air inlet (not shown) is formed on the front surface. Is formed. On the left and right side surfaces of the motor housing portion 4, air inlets 22, 22... Are formed on the outer side of the air inlet, and on the outer side of the air outlet 21, exhaust ports 23, 23. .

The front housing portion 6 has a front end that is circular in plan view, and its lower side is opened by hanging on the left and right side surfaces, the front surface, and the lower surface, and a gear housing 24 is held inside. The gear housing 24 includes a front and rear horizontal cylindrical portion 25 that houses the speed reduction mechanism 7, and a vertical vertical cylindrical portion 26 that is connected downward from the front end of the horizontal cylindrical portion 25 to receive the output portion 8. It is a side-viewed L-shaped cylinder. Among these, the horizontal cylinder portion 25 has a large-diameter rear half portion 27 and a front half portion 28 that is coaxially formed with a smaller diameter than the rear half portion 27, and the rear half portion 27 is fitted to the bracket 18.
4B, a carrier 30 having an internal gear 29 and three planetary gears 31, 31,... Meshing with the pinion 19 in the internal gear 29 is accommodated. Then, the intermediate shaft 32 that is coaxially coupled to the carrier 30 is supported coaxially with the motor shaft 14 by the bearings 33, 33 provided in the front and rear in the front half portion 28, thereby forming the speed reduction mechanism 7. A bevel gear 34 is formed at the front end of the intermediate shaft 32 and protrudes into the vertical cylindrical portion 26.

  The vertical cylinder portion 26 has a small-diameter upper bearing portion 35 in the upper portion and a large-diameter lower bearing portion 36 in the lower portion, and the front end of the front housing portion 6 looks like the upper bearing portion 35 is covered with the lower bearing. The left and right side surfaces and the front surface of the portion 36 are exposed. The output portion 8 includes an output shaft 38 supported in the vertical direction by bearings 37 and 37 held by the upper bearing portion 35 and the lower bearing portion 36, respectively, and a drill as a tip tool holding portion provided below the output shaft 38. A chuck 39 and a bevel gear 40 that is key-coupled to the output shaft 38 on the upper side of the drill chuck 39 and meshes with the bevel gear 34 of the intermediate shaft 32 are provided. Further, an illumination light (LED) 41 is held in the front housing portion 6 below the horizontal cylinder portion 25 and obliquely downward toward the lower side of the drill chuck 39. The light 41 is accommodated in a convex portion 42 formed on the front housing portion 6 so as to protrude downward from a front portion of a switch lever 44 described later. The rear surface of the convex portion 42 is formed in a curved shape.

  Here, the horizontal cylindrical portion 25 of the gear housing 24 is formed to have a smaller diameter than the motor case 13, and the gear housing 24 is positioned below the upper end of the motor case 13, so that the front half portion of the horizontal cylindrical portion 25 is located. 28 and the upper bearing part 35 of the vertical cylinder part 26 are positioned further below the rear half part 27. Therefore, the upper surface 6a of the front housing portion 6 that holds the gear housing 24 is also inclined downwardly in a curved shape from the housing portion of the rear half portion 27 toward the front, and in the housing portion of the front half portion 28 and the vertical cylinder portion 26, the rear half. It is lower than the upper end of the portion 27. Thereby, the upper surface 6 a of the front housing part 6 is lower than the upper surface 4 a of the motor housing part 4. Further, the vertical length of the head portion H composed of the front housing portion 6 and the vertical cylindrical portion 26 and the output portion 8 (vertical length from the upper surface 6a shown in FIG. 1 to the lower surface of the drill chuck 39 (projecting surface of the claw). ) L1 is also shortened.

Further, the screws 3, 3... For assembling the half housings 2 a, 2 b on the front side of the motor 5 are screws 3 A disposed on the front side of the upper bearing portion 35 of the vertical cylindrical portion 26 (A, B .. English letters)), screws 3B, 3B arranged above and below the motor shaft 14 between the motor case 13 and the bracket 18, and screws arranged below the horizontal cylinder portion 25. 3C, both of which are below the upper end of the motor case 13. In particular, the screw 3A is located in the escape recess 26a formed at the upper end of the front portion of the vertical cylinder portion 26 by the upper bearing portion 35 having a small diameter, and is disposed below the upper end of the upper bearing portion 35. The screw boss and the screw 3A do not become an obstacle to lower the upper surface 6a of the front housing portion 6.
A constricted portion 6b having a narrow left and right width is formed on the rear side of the vertical cylindrical portion 26 in the front housing portion 6 as shown in FIG. Due to the constricted portion 6b, the outer shape of the front housing portion 6 is also reduced in the left-right direction.
Further, the vertical cylindrical portion 26 is positioned by fitting the upper bearing portion 35 into a receiving recess 6 c provided on the upper inner surface of the front housing portion 6. At the same time, the positioning concave portion 26b provided on the rear upper surface of the upper bearing portion 35 is also positioned by engaging the rear positioning convex portion 6d forming the receiving concave portion 6c on the front housing portion 6 side.

  And before and after the receiving recess 6c, pins 2c and 2c are integrally projected on one of the half housings 2a and 2b, and a hole (not shown) is formed on the other. When the half housings 2a and 2b are assembled, one of the pins 2c and 2c is inserted into the other hole, so that the assembly of the housing 2 can be improved and the integrity of the half housings 2a and 2b can be improved. The pins 2c and 2c may be separate members.

  On the other hand, the grip 9 holds the switch 10 on the rear axis of the motor 5 with the plunger 10a facing downward, and a forward / reverse switching lever 43 of the motor 5 is provided behind the switch 10. On the lower surface of the housing 2, a switch lever 44 extending from the front housing portion 6 to the grip portion 9 and extending in the front-rear direction is provided so as to swing up and down around the upper end with a slightly inclined upper end. Yes. The switch lever 44 includes an operation portion 46 exposed downward through an opening 45 in the front-rear direction provided on the lower surface of the housing 2, and a front end portion 47 and a rear end portion 48 extending upward from the front and rear ends of the operation portion 46. The front end portion 47 is rotatably supported in the front housing portion 6 in front of the motor 5 and above the convex portion 42, and the rear end portion 48 is inserted into the grip portion 9 to be connected to the switch 10. It extends backward on the lower side. Therefore, when the operation portion 46 is pushed toward the opening 45, the rear end portion 48 rotated upward with the front end portion 47 as the center pushes the plunger 10a and turns on the switch 10.

The battery mounting part 11 has a structure in which the battery pack 12 can be slid from below, and a terminal block 49 electrically connected to the battery pack 12 is held in the vertical direction. A hanging hook 50 is screwed to the left side surface of the battery mounting portion 11, and a holder 52 for holding the operation key 51 of the drill chuck 39 is screwed to the right side surface.
The battery pack 12 here has a rated voltage of 10.8 V (however, a voltage of 7.2 V to 18 V is also acceptable), and the battery in a state where it is mounted on the battery mounting portion 11 shown in FIG. The vertical length L2 of the pack 12 is larger than the vertical length L1 of the head portion H.

  In the angle drill 1 configured as described above, when the operation portion 46 of the switch lever 44 is pushed in with the hand holding the grip portion 9, the rear end portion 48 pushes the plunger 10a to turn on the switch 10. Then, the motor 5 is driven to rotate the motor shaft 14, and the planetary gear 31 revolves by the rotation of the pinion 19, and the intermediate shaft 32 is decelerated and rotated through the carrier 30. Therefore, the output shaft 38 rotates together with the drill chuck 39 due to the meshing of the bevel gears 34 and 40, so that drilling or the like can be performed by the bit held by the drill chuck 39.

Here, the position of the head portion H is lower than the upper surface 4a of the motor housing portion 4, and the vertical length L1 of the head portion H is also shortened. Therefore, the head portion H is inserted even in a narrow place. Can do.
At the same time as the switch 10 is turned on, the light 41 is turned on to illuminate the machining position, and the rotation of the fan 20 causes the outside air to be sucked in from the air inlet 22 and enters the motor case 13 from the air inlet. Through the exhaust port 23. Therefore, the motor 5 is cooled.

Thus, according to the angle drill 1 of the said form, since the upper surface 6a of the front housing part 6 is located below the upper surface 4a of the motor housing part 4, the vertical dimension of the head part H is made small. The workability in a narrow place can be improved.
The gear housing 24 is integrally formed with a coaxial horizontal cylindrical portion 25 formed with a diameter equal to or smaller than the outer diameter of the motor 5 and a vertical cylindrical portion 26 provided at the front end of the horizontal cylindrical portion 25 and holding the output shaft 38. By being provided, it is possible to contribute to the downsizing of the head portion H, and it is possible to ensure the strength even with a small diameter.

In particular, here, the speed reduction mechanism 7 includes a planetary gear 31 arranged around a pinion 19 provided on the motor shaft 14, a carrier 30 that supports the planetary gear 31, and a motor shaft 14 that is coupled to the carrier 30. Since the intermediate shaft 32 is arranged coaxially and includes the intermediate shaft 32 that transmits rotation to the output shaft 38, the intermediate shaft 32 can be coaxially arranged with the motor shaft 14, and the gear housing 24 can be kept small in diameter.
Further, a switch 10 is disposed behind the motor 5, and below the motor 5 and the switch 10, it extends in the front-rear direction, the front end portion 47 is positioned in front of the motor 5, and the rear end portion 48 is the switch 10. By providing the switch lever 44 positioned below, a switch lever 44 that is long in the front-rear direction is obtained and the operability is improved.

Furthermore, since the forward / reverse switching lever 43 of the motor 5 is provided behind the switch 10, the forward / reverse switching lever 43 is easily operated by a hand holding the grip portion 9.
In addition, a convex portion 42 that protrudes downward is provided behind the drill chuck 39, and a light 41 that irradiates the lower portion of the drill chuck 39 is provided in the convex portion 42. The processing location can be illuminated.

In the above embodiment, the gear housing is formed by integrating the horizontal tube portion and the vertical tube portion.For example, the gear housing is formed by dividing the horizontal tube portion and the vertical tube portion and connecting both tube portions, It may be formed by connecting three or more parts including other parts.
The speed reduction mechanism is not limited to the planetary gear type. For example, the first intermediate shaft is disposed at an eccentric position on either the left or right side of the pinion of the motor shaft, and the bevel gear of the output unit is positioned in front of the first intermediate shaft at the coaxial position with the motor shaft. Even if a second intermediate shaft that meshes with the second intermediate shaft is arranged to decelerate from the pinion to the second intermediate shaft via spur gears, downsizing in the vertical direction can be achieved.
Further, it is possible to omit the convex portion and the light, or to slide the battery pack from above or from the side. However, even an AC machine that does not use a battery pack as a power source can be made compact by setting the upper surface position of the front housing part and the dimensions of the head part.

  1. ・ Angle drill, 2 ・ Housing, 3 ・ Screw, 4 ・ ・ Motor housing, 4a ・ ・ Top surface, 5 ・ ・ Motor, 6 ・ ・ Front housing, 6a ・ ・ Top, 7 ・ ・ Reduction mechanism 8 .. Output part, 9 .. Grip part, 10 .. Switch, 11 .. Battery mounting part, 12 .. Battery pack, 13 .. Motor case, 14 .. Motor shaft, 18 .. Bracket, 19. · Pinion, 24 · · Gear housing, 25 · · Horizontal tube portion, 26 · · Vertical tube portion, 27 · · Second half portion, 28 · · Front half portion, 32 · · Intermediate shaft, 35 · · Upper bearing portion, 36 · ·・ Lower bearing part, 38 ..Output shaft, 39 ..Drill chuck, 41 ..Light, 42 ..Convex part, 44 ..Switch lever, L1 ..Vertical length of head part, L2 The vertical length of.

Claims (7)

A motor having a motor shaft facing forward;
An output shaft that is driven to rotate by rotation of the motor shaft and extends in the vertical direction;
A tip tool holding part fixed to the output shaft;
A motor housing portion in which the motor is disposed, and a housing having a front housing portion for holding the output shaft,
The angle drill according to claim 1, wherein an upper surface of the front housing portion is positioned below an upper surface of the motor housing portion. A battery mounting portion provided at the rear end and capable of slidingly mounting a battery pack having a rated voltage of 7.2V to 18V from above and below;
A motor powered by the battery pack and extending in the front-rear direction;
An output shaft that is rotationally driven by the motor and extends in the vertical direction;
A tip tool holding part fixed to the output shaft;
A motor unit in which the motor is disposed; and a head unit in which the tip tool holding unit is disposed;
The angle drill characterized in that the vertical length of the head portion is smaller than the vertical length of the battery pack held by the battery mounting portion. A motor having a motor shaft facing forward;
An output shaft that is driven to rotate by rotation of the motor shaft and extends in the vertical direction;
A tip tool holding part fixed to the output shaft;
A speed reduction mechanism provided between the motor shaft and the output shaft;
A housing having a motor housing portion in which the motor is disposed, and a front housing portion for holding the output shaft;
A gear housing that holds the speed reduction mechanism in the housing,
The gear housing is integrally formed with a coaxial horizontal cylindrical portion formed with an outer diameter of the motor or less and a vertical cylindrical portion provided at the front end of the horizontal cylindrical portion to hold the output shaft. Angle drill characterized by   The speed reduction mechanism includes a planetary gear disposed around a pinion provided on the motor shaft, a carrier that supports the planetary gear, a carrier coupled to the carrier and disposed coaxially with the motor shaft, and the output shaft. The angle drill according to claim 3, further comprising an intermediate shaft that transmits rotation.   A switch is disposed behind the motor, and a switch lever that extends in the front-rear direction and has a front end positioned forward of the motor and a rear end positioned below the switch is disposed below the motor and the switch. The angle drill according to any one of claims 1 to 4, wherein the angle drill is provided.   The angle drill according to claim 5, wherein a forward / reverse switching lever of the motor is provided behind the switch.   7. A convex portion protruding downward is provided behind the tip tool holding portion, and a light for irradiating the lower portion of the tip tool holding portion is provided in the convex portion. An angle drill according to any one of the above.

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