JPH0521376Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a drilling device for forming holes in hard materials such as concrete and stone, and is particularly useful for reducing noise and dust during drilling operations. This invention relates to a cover member for collecting, etc.

[Prior Art] This type of cover member is known, for example, from Japanese Patent Application Laid-open No. 1983
The one published in Publication No. -262608 is known. This is done by surrounding the entire length of the drill with a bellows-shaped dustproof membrane that is expandable and retractable in the axial direction of the drill, and by forming an air vent in a mounting plate attached to the rear end of the dustproof membrane. The structure is such that the suction hose is connected to the

[Problems to be solved by the invention] By the way, with this type of manual type drilling device, it is necessary to firmly hold the device with both hands in order to eliminate drilling wobbling due to instability of the device during drilling. In terms of configuration, it is desirable to minimize factors that impede usability or mobility.

However, in the drill described in Japanese Patent Application Laid-Open No. 60-262608, since no handle member is provided at the front end of the drill, it is difficult to stabilize the drill. Even if it were attempted to provide a handle member, the effective space for the proper attachment of the handle member would be limited by the presence of suction hoses, pressure hoses, etc., making it difficult to implement the handle member.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cover member in which a handle member can be formed without interfering with the maneuverability of a drill device, regardless of the presence of a suction hose or the like.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a bellows-shaped cover that surrounds the entire length of the drill held by a drill holder provided at the front of the drill device main body. and a substantially cylindrical connecting part that is attached to the rear end of the cover and fitted into the drill holding part, and the distal end is connected to the front end of the cover, and the rear end side slides onto the connecting member in the axial direction of the drill. A guide rod is movably supported, and a coil spring is fitted into the guide rod and constantly biases the cover away from the connecting member. In addition to having an opening extending through the suction device, a handle portion is provided protruding from the suction device and connectable to a connecting pipe from the suction device at the location of the air vent, and an internal flow path communicating with the air vent is formed in the handle portion. It is characterized by a configuration consisting of:

[Operation of the invention] The cover member is grasped by the handle, the drilling position of the drill is determined, and the drilling operation is started in this state. Since the cover that surrounds the entire length of the drill has its tip opening in contact with the object to be drilled, the internal surrounding space is closed. Therefore, dust generated during drilling is not dissipated to the outside, and noise caused by drilling is also blocked.

Furthermore, during drilling work, by forcibly suctioning and discharging the air in the space closed by the cover from the air vent of the connecting member, the air discharged from the tip of the drill and other air intake ports is routed along the drill to the air vent. flowing into
It is sucked into the suction device through the internal flow path of the handle.
In this way, the air flowing from one end of the internal surrounding space of the cover to the other end prevents dust generated during perforation from adhering to the inner surface of the cover, thereby eliminating the accumulation of dust.

In addition, since the airflow flows along the axis of the drill, uniform fluid pressure is applied to the entire circumferential surface of the drill, and the rotating drill receives support from the pressure fluid from the sides, making it stable and suppressing wobbling.

[Embodiment of the invention] An embodiment of the invention will be described below based on the drawings. FIG. 1 is a partially sectional side view of the cover member according to the present invention in an attached state, and FIG. 2 is a partially cutaway perspective view of the cover member.

In the figure, 1 is the main body of the drill device. This device main body 1 has a rotation driver 3 such as an electric motor inside a casing 2. The vicinity of both ends of the rotating shaft 5 that holds the rotor 4 of the rotary driver 3 is connected to the casing 2
It is rotatably supported by bearings 6a and 6b fixed to the.

The rotating shaft 5 has a passage 7 passing through it along its axis. A rear end 5a of the rotary shaft 5 protrudes into a fluid reservoir 8 provided in the casing 2, and the peripheral surface of the rear end 5a is closed with a sealing material 9. The fluid reservoir chamber 8 is connected to a fluid introduction member 12 provided at the lower end of the handle 10 via a fluid supply pipe 11 arranged inside the handle 10 that hangs down from the rear of the device body 1.
It is connected to the. Therefore, the fluid introducing member 12 is equipped with a pressure fluid generating device (not shown) such as a compressor.
By connecting the conduit P1 from the fluid supply pipe 1
Pressure fluid can be sent from the rotary shaft 5 to the flow path 7 of the rotary shaft 5 via the fluid reservoir chamber 8 .

13 is a switch provided on the handle 10.
By operating this switch 13, the rotary driver 3 can be rotated. Rotary driver 3
If the switch 13 is an electric motor, the switch 13 is an electric switch, and if the switch 13 is driven by a high-pressure gas, it is a fluid switch, and has a switch mechanism depending on the drive source.
Reference numeral 14 denotes a drill that is held by a drill holder 15 such as a chuck provided at the front of the drill body 1. The drill 14 here has a passage 16 passing through it along its axis. At the tip of the drill 14,
A cutting blade 17 is provided which is formed by sintering ultra-hard abrasive grains containing diamond or the like into a cylindrical shape. The front surface of this cutting edge 17 is recessed into a spherical shape to enhance the drilling effect.

Reference numeral 20 denotes a cover member that fits onto the drill holding portion 15. This cover member 20 includes a cover 21 which is made of flexible synthetic resin or an elastic material such as rubber and formed into a bellows shape so as to be expandable and retractable, and a rear part of the cover for connecting the cover 21 to the drill holder 15. A substantially cylindrical connecting member 22 attached to the end and fitted into the drill holding part 15, and an annular contact member 23 provided on the outer periphery of the front end of the cover 21.
and guide rods 25, 25 whose tips are connected to the abutting member 23 and whose rear ends are supported by support members 24, 24 protruding from both sides of the connecting member 22 so as to be slidable in the axial direction. By providing a coil spring 26 between the abutment member 23 and the support member 24 around each guide rod 25, the abutment member 23 is normally biased in a direction away from the support member 24. That is, the tip of the cover 21 that is elastically connected to the abutment member 23 is always pushed forward, and the cover 21 is in an extended state.

Reference numeral 27 denotes a finger rest hanging vertically from the abutment member 23. When you hook your finger on this finger hook 27 and pull it backward, the coil spring 26 wrapped around the guide rod 25 is compressed and moves back the guide rods 25, 25 on both sides, and is guided by these guide rods 25, 25. The cover 21 expands and contracts. Of course, if the front end of the cover 21 or the contact member 23 is brought into contact with a suitable object and the drill device main body 1 is pressed toward the object,
Similarly to the above, the cover 21 expands and contracts together with the abutting member 23.

The connecting member 22 located between the cover 21 and the drill holding part 15 has an air vent 28 penetrating through a part of the peripheral wall, and this air vent 28 is connected to a connector 29 protruding from the connecting part 22. It opens into the internal flow path 29'. The connector 29 is for connecting to a connecting pipe P2 from a suction device (not shown) such as a vacuum or a suction pump, but here, in order to function as a handle, a handle portion having a shape suitable for gripping is used. It forms 30. Preferably, the handle part 3
The lower end 30a of 0 is formed into a tapered shape, and the connecting pipe P2 is configured to be easily pushed in. Therefore, when suction force from the pump is appropriately applied via the connecting pipe P2 and the connector 29, the upper air vent 28 Kara cover 21
The air inside flows out. At this time, as shown in the figure, the internal flow path 29' of the connector 29 is connected to the air vent 28.
If the orifice is formed by constricting the suction flow near the , the suction flow will become faster.

The connecting member 22 also includes a holding portion 32 that securely holds a limiting rod 31 for limiting the depth of the hole during drilling.
have. This holding portion 32 includes a pair of holding pieces 32 that protrude from the outer peripheral surface of the connecting member 22 in an opposing manner.
a, 32b can be compressed by thumbscrews 33. Thereby, the rod-shaped restriction rod 31 held between the holding pieces 32a and 32b can be freely moved in the length direction or fixed by operating the thumbscrew 33. Therefore, the drilling depth determined between the limit rod 31 and both tips of the drill 14 can be set arbitrarily.

Next, the operation of the above embodiment will be explained.

When drilling a target such as concrete, the drill holding portion 15 is fitted into the connecting member 22, thereby joining the drill device main body 1 and the cover member 20 together as shown in FIG. Therefore, while gripping the handle 10 with one hand and gripping the handle portion 30 of the connector 29 with the other hand, the cutting blade 17 of the drill 14 and the front end of the cover 21 are brought into contact with the object to be drilled. At this time, in order to check whether the cutting blade 17 is hitting the drilling position of the object to be drilled, the finger hook 27 is used to move back the abutment member 23 and the cover 21 is expanded and contracted.
Visually check position 7.

During drilling, the cutting blade 17 penetrates the object S, and the contact member 23 and the front surface of the cover 21 come into contact with the surface of the object S, closing the internal space of the cover 21 (FIG. 3).

Therefore, the flow paths 7 and 1 pass through the rotary shaft 5 and the drill 14 via the fluid supply pipe 11 and the fluid reservoir chamber 8 by driving the compressor or the like connected to the conduit P1.
At the same time, a pump or the like connected to the connecting pipe P2 is driven to discharge the air inside the cover 21 from the air vent 28. As a result, the air flowing out from the tip of the drill 14 flows against the outside of the drill 14 in the axial direction, as indicated by the arrow in the figure, and flows into the air vent 28. In this fluid supply state, operate the switch 13 to
By rotating the drill 14, a hole is drilled in the object S to be drilled. During this drilling process, chips and dust are generated from the object S to be drilled, but the airflow flowing out from the tip of the drill and flowing into the air vent 28 carries out the chips. By this,
Chips inside the hole being machined are effectively eliminated.
At this time, by slightly increasing the suction force of the fluid discharged from the air vent 28 with respect to the pressure fluid supplied to the flow path 16 inside the drill 14, the surface of the drilling target S and the cover in contact therewith are increased. Since outside air flows into the inside of the cover 21 through the gap between the cover 21 and the front edge of the cover 21, it is possible to prevent chips from escaping to the outside through the gap.

In addition, the air discharged from the tip of the drill suppresses the heat generation of the cutting edge during drilling, and the airflow reaching the air vent 28 acts as lateral pressure on the circumferential surface of the drill 14 and becomes an axial support force, so that the drill Suppresses slight vibrations and shakes.

As the drilling process progresses as described above, the state shown in the lower half of FIG. 3 shifts to the drilling state shown in the upper half of FIG. During this process, the drill 14 drills the object S
The front end of the cover 21 and the abutting member 2
3 is blocked from moving forward by the object S, and therefore the guide rod 25 moves backward while repelling the spring 26, and at the same time, the bellows-shaped cover 21 expands and contracts.

The forward drilling of the drill 14 during drilling is carried out by the holding part 32.
The limiter 31 stops when the tip thereof held in contact with the surface of the object S. In this way, a hole with a desired depth can be bored in the object S.

A handle portion 30 is provided protruding from the connecting member 22 to open the air vent 2.
8 and the internal flow path 29', and the connecting pipe _P2 from the suction device is connected to the lower end of the handle part 30, so that the installation space for the connecting pipe _P2 and the handle part 30 can be shared. Ta.

Thereby, a stabilized configuration of the drill device main body 1 can be achieved without interfering with the suction function and maneuverability.

Although the drill device main body 1 has been illustrated and described, the receiving structure of the connecting member 22 does not prevent installation of the drill device even if the drill device has a different structure.

Further, although the drill 14 has a structure having a passage 16 penetrating along the axis, the cover member 2
The perforated portion on the side of the connection member 0 can also be configured as an intake port.

Furthermore, in addition to the drill 14 described above, it can also be attached to a solid shank structure or other twist drill. Of course, it can also be applied to a hammer drill.

[Effects of the invention] According to the invention, the handle part for stabilizing the drill device during drilling work can be provided at an appropriate location without being affected by the presence of the suction structure, resulting in improved usability and maneuverability. It is possible to improve the

[Brief explanation of the drawing]

The drawings show an embodiment of the cover member of a drilling device according to the present invention, and FIG. 1 is a partially sectional side view, and FIG.
The figure is a partially cutaway perspective view of the cover member, and FIG. 3 is a side cross-sectional view showing two states in use: the lower half shows the state at the beginning of drilling, and the upper half shows the state at the end of drilling. 1...Drill device main body, 3...Rotary drive device, 3
... Rotating shaft, 7 ... Channel, 14 ... Drill, 16
...Flow path, 20...Cover member, 21...Cover, 22...Connection member, 28...Air vent, 29...
...Connector, 30...Handle part.

Claims (1)

[Scope of utility model registration request] A bellows-shaped cover that telescopically surrounds the entire length of the drill and that surrounds the entire length of the drill held by a drill holder provided at the front of the drill device body, and a rear end of this cover. a substantially cylindrical connecting member attached to the drill holder and fitted into the drill holder; and a guide whose tip end is connected to the front end of the cover and whose rear end side is slidably supported by the connecting member in the axial direction of the drill. The connecting member is provided with a rod and a coil spring that is fitted into the guide rod and constantly biases the cover in a direction away from the connecting member, and the connecting member is provided with an air vent through a part of its peripheral wall. A cover member for a drill device, the cover member having a handle portion protruding from the air vent position and connectable to a connecting pipe from a suction device, the handle portion having an internal flow path communicating with the air vent port.