JPS6224981A - Battery type punching tool - 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 1] The present invention relates to a battery-powered drilling tool equipped with a drive mechanism that applies impact vibration to a tool such as a drill bit.

[Background technology 1] Tools used to drill into concrete etc. are designed to apply impact force to the tool, but in this case, the chips that fall when drilling into a ceiling surface etc. are caused by the impact. Vibration of the tool causes it to enter the tool through small gaps. On the other hand, the battery storage room that houses the batteries that serve as the power source is
If the attachment/detachment opening is placed on the bottom of the tool, the battery's own weight will cause the lid to open, making it easy for the battery to fall out.Additionally, if the attachment/detachment opening is placed on the back of the tool, the grip will be too tight to open and close the lid. In order to avoid obstruction, it is preferable to face the front, that is, the tool side. However, if it faces the tool side like this, chips will enter the battery compartment through the gap in the lid that closes the attachment/detachment opening and reach the contact point between the battery terminal and the contact fitting, as described above. Chips will adhere to it, leading to poor contact problems such as an increase in contact resistance.

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to facilitate attachment and detachment of batteries, and to
To provide a battery-powered drilling tool that is free from troubles caused by chips entering a battery storage chamber.

[Disclosure of the Invention] The present invention provides a battery-powered drilling tool that is provided with a drive groove in the housing that applies impact vibration to a tool such as a drill bit, and a battery that serves as a motor and power source in the housing. The tool-side surface of the battery storage chamber that accommodates the battery is used as an opening for battery attachment/detachment, and a lid with one end pivoted to the housing is disposed on this opening surface, and the other end of the lid is arranged in the opening/closing direction of the lid. The key point is that the opening edge of the opening surface that polymerizes has a receiving area for chips, and by making the opening surface for battery insertion and removal in the battery storage chamber the surface on the tool side, it is made easier to install and remove the battery, and there is no need to worry about it. By overlapping the lid that closes the attachment/detachment opening with the opening edge of the attachment/detachment opening surface in the opening/closing direction of the lid, it is possible to prevent chips from entering the battery compartment, and at the same time, to prevent chips from entering the battery compartment. Chips that have entered the overlapping portion with the edge are collected in a receiving groove provided at the edge of the opening.

The present invention will be described in detail below based on the illustrated embodiment. The housing 1 has a chuck part 41 at its front end to which a bit 38 as a tool is attached, and a grip 3 at the lower rear end. A storage chamber 50 for a storage battery 5 is integrally provided in front of this grip 3 via a handle space 70, and an auxiliary grip 4 is attached to the lower front end. In the figure, 12 is a switch, and 11 is a switch handle, which can be operated with the hand holding the grip 3. The storage battery 5 housed in the storage chamber 50 has a terminal 55 disposed on the upper surface of the rear end thereof in contact with a contact spring 56 disposed within the housing 1 . Further, the front surface of the storage chamber 50, that is, the surface on the bit 38 side serves as an opening surface for attaching and detaching the storage battery 5, and is closed by a lid 51.

The mower 22 is housed in the rear end of the housing 1 together with the control circuit box 13 with its axial direction being the front-back direction, and a pinion 21 is attached to the output shaft 20 of the mower 22 . This pinion 21 meshes with a gear 22 at one end of an intermediate shaft 23 whose both ends are rotatably supported by bearings 45° 45 in the gear case 6 and whose axial direction is parallel to the axial direction of the motor 2. Also, intermediate 1tl [123
is equipped with a pinion 24 at the other end, and a bevel gear 26 is freely rotatably attached thereto, and is spline-coupled to the intermediate shaft 23 at the center, and is connected to the bevel gear 26 side by a clutch spring 44. A biased clutch plate 43 is attached. The engagement of the clutch plate 43 with the bevel gear 26 is controlled in accordance with the operation of a clutch switching lever (not shown).6 At the axial front of the motor 2, bearings 4 are provided at both front and rear ends.
A cylindrical sill 31 is installed coaxially with the motor 2 and is supported by 6.46 so as to be able to freely rotate around the axis. This Schilling-31 has a gear 25 fixed to the outer periphery of its rear end that engages with the pinion 24, and also houses a hammer 33 in the front and a piston 32 in the rear. The space between the two is used as an air spring chamber. A crankshaft 28 is installed between the cylinder 31 and the motor 2, and is rotatably supported by bearings 47 and 47 with the axial direction being the vertical direction. The other end is connected to this crankshaft 28 by a crank pin 29,
Further, a bevel gear 27 that meshes with the bevel gear 26 is provided at the lower end of the crankshaft 28. The rotation of the crank pongee 28 causes the piston 32 to reciprocate, and the hammer 33 is driven via an air spring.
is transmitted to bit 38 via.

The spindle 34 has a cylindrical shape with a rear end fixed to the front end of the sill 31 by a stop key 37, and supports a striker 35 slidably in the axial direction within the rear end thereof. A dustproof ring 48 is attached. Note that the sliding movement of the striker 35 is similar to that of the striker 35.
The range is regulated by the engagement of the stop key 37 with the axially long long groove 36 formed in the stop key 37.

The bit 38 is held with its rear end contained within the front part of the spindle 34. By engaging a long groove 39 extending in the axial direction provided on the outer circumferential surface of the rear end of the pit 38 with a key 40 held by the spindle 34, it is possible to freely slide in the axial direction within a predetermined range. At the same time, the bit 38 is rotated together with the spindle 34. The bit 38 is attached and detached by retracting the chuck portion 41 against the coil spring 42 so that the key 40 can be moved outward.

However, in the lever hammer drill, when the motor 2 is rotated, the bit 38 is moved from the intermediate shaft 23 by a shilling.
31 and spindle 34 to rotate by receiving rotational force. Further, when the clutch formed by the clutch plate 43 and the bevel gear 26 is connected, the hammer 33 follows the reciprocating movement of the piston 32 caused by the crank pongee 28 and the connecting rod 30, and the hammer 33 hits the striker 35. The impact is transmitted to the rotating bit 38 via the striker 35.

Now, as mentioned above, the front surface of the storage chamber 50 on the bit 38 side is an opening surface for attaching and removing the storage battery 5, but the lid 51 that closes this opening surface rotates around its lower end. This opens and closes the opening, and its pivot is attached via a plate 52. As shown in FIG. 4, the mounting plate 52 is rotatably supported at one end by a rotary shaft 53 at the lower part of the storage chamber 50, and is attached to a rib 57 on the inner surface of the lid 51 and a presser plate 58. The other end is slidably disposed between the rib 57 and the other end, and a pressing spring 59 is provided between the other end and the rib 57. -I can do it.

Further, the outer surface of the lid 51 is provided with a plurality of ribs 60 parallel to the rotating shaft 53, and seven ribs 61 are provided respectively protruding from both sides of the upper end. On the other hand, as is clear from FIG. 3, the upper end of the opening edge of the storage chamber 50 is
The stepped portion is one step lower than the outer surface of the storage chamber 50, and at the same time, a receiving groove 65 is formed, an engagement groove 66 is formed on both sides, and a dustproof rubber 6 is formed on the lower surface of the step.
7 are arranged.

Now, when the lid 51 is closed by elastically engaging the seven hooks 61 with the engagement grooves 66, the upper end of the lid 51 overlaps the lower opening edge, covers the receiving groove 65, and further The upper end surface of the lid 51 comes into contact with the dustproof rubber 67 due to the upward bias by the pressing spring 59 . In other words, there is no gap between 151 and the opening edge of storage chamber 50.

Therefore, when performing upward drilling as shown in FIG. 7, chips fall on the surface of the lid 51, which is the front surface of the storage chamber 50, and are deposited on the surface of the lid 51. However, since the M51 and the opening edge of the storage chamber 50 are in close contact with each other as described above, there is no possibility of chips entering inside. The operation of this hammer drill is accompanied by vibration, but even if the chips move due to this vibration and may enter the overlapping part of the lid 51 and the storage chamber 50, the chips will not be received. It accumulates in the groove 65 and does not invade the inside of the storage chamber 50.

Here, the rib 60 provided on the outer surface of the lid 51 is
This prevents the chips from moving to the rotating shaft 53, so that the smooth opening and closing of the lid 51 is not hindered by chips entering the rotating shaft 53, and at the same time, the lid 51 It serves as a clue when opening and closing. In addition, on both inner walls of the storage chamber 50, as shown in FIGS. 3 and 6, there is a gap between the opening side of the storage chamber 50 and the upper rear end of the storage chamber 50 where the contact fitting 56 is disposed. An inclined rib 69 is provided that runs as a partition, so that even if chips should enter the storage chamber 50, the inclined rib 69 that is in contact with or close to the side surface of the storage battery 5 will not break. The direction of movement of the powder is limited so that it does not reach the contact fitting 56.

[Effects of the Invention] As described above, in the present invention, since the opening surface for attaching and detaching the battery in the storage chamber is on the tool side, it is easy to attach and detach the battery. Despite the fact that the lid that closes the opening surface overlaps the opening edge in the opening/closing direction of the lid, and a receiving groove is provided on the opening edge, the path for entry into the storage chamber is narrow. In addition, the chips that have entered will accumulate in the receiving groove, so there is almost no chance of chips entering the storage chamber, and problems such as poor contact caused by chips can be prevented. It is something.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of one embodiment of the present invention, Figs. 2 and 3 are perspective views of the same as above, Fig. 4 is an exploded perspective view, Fig. 5 and pt.
Figure S6 is a partial sectional view, and Figure 7 is a perspective view showing the state of use, in which 1 is a housing, 5 is a storage battery, 38 is a bit as a tool, 50 is a storage chamber, 51 is a lid, 60 is a rib,
65 is a receiving groove, 67 is a dustproof rubber, and 69 is an inclined rib. Agent Patent Attorney Mr. Ishi 1) Figure 7 Figure 2 Figure 3 Figure 5 Figure 6 Figure 7

Claims (4)

[Claims] (1) In a battery-powered drilling tool that is equipped with a drive mechanism in the housing that applies impact vibration to a tool such as a drill bit, and also has a motor and a battery as a power source in the housing, a battery storage chamber that houses the battery. A lid, one end of which is pivoted to the housing, is disposed on this opening surface with the tool side surface as an opening surface for battery attachment/detachment, and the other end of the lid is placed on the opening edge of the opening surface that overlaps in the opening/closing direction of the lid. A battery-powered drilling tool characterized by being provided with a receiving groove for chips. (2) The battery-powered drilling tool according to claim 1, characterized in that a dust-proof rubber is disposed near the receiving groove. (3) The battery-powered drilling tool according to claim 1, wherein the lid is provided with ribs on its surface that are substantially parallel to the pivot axis. (4) The battery storage chamber is provided with an inclined rib on the inner wall that runs between the opening side of the chamber and the side where the contact fittings that come into contact with the battery terminals are disposed. battery-powered drilling tool.