JP2004160949A - Concrete drill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concrete drill with good workability, which enables the position of the center of gravity to be set near a grip by enabling the shortening of an overall length from the tip of a core bit to the grip. <P>SOLUTION: In this concrete drill 1 which rotates the core bit 2 by rotatively driving a bit driving shaft 16 and drills a hole in concrete etc. by imparting axial vibrations to the core bit 2, the grip 5 is formed on the side of one end of a main body housing 4 wherein a chuck part 3 for fitting the core bit 2 is formed on the side of the other end; a drive motor 7 for rotatively driving the shaft 16 is arranged in such a manner that an output shaft 17 of the drive motor 7 is orthogonal to the shaft 16; and an excitation mechanism 9 for imparting the vibrations to the core bit 2 is formed near the drive motor 7 and driven by the drive motor 7. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete drill for drilling holes in a concrete wall, a stone material, or the like by applying rotation and vibration to a core bit mounted on a chuck portion by a drive motor that is rotationally driven by power such as electric power or compressed air.
[0002]
[Prior art]
When performing plumbing work for gas, water or cooling and heating on the wall, floor or foundation of a building made of concrete, core bits attached to a concrete drill driven by power such as electric power or compressed air are used for these. 2. Description of the Related Art Drilling work is performed on wall surfaces and the like. The core bit attached to the chuck formed at the tip of the concrete drill is given a rotational force and vibration along the axial direction by the drive motor from the concrete drill side, and the concrete is drilled by the cylindrical drilling blade formed at the tip of the core bit. A hole having a predetermined diameter is formed in a wall or the like.
[0003]
In a conventional concrete drill, a rotation drive mechanism for rotating and driving a core bit and a vibration mechanism for imparting axial vibration to the core bit each have a dedicated drive motor, and these mechanisms are mounted with a core bit on the distal end side. They are arranged in series along the axial direction of the bit drive shaft (for example, see Patent Document 1). As described above, when the drive motors are provided for the rotation drive mechanism and the vibrating mechanism, respectively, and these are formed along the bit drive shaft, from the tip of the core bit attached to one end of the bit drive shaft to the other end of the main shaft. When the grip is formed at the other end of the bit drive shaft as a hand-held concrete drill, the overall length becomes longer and the operability when gripping and drilling the grip is increased. It will be spoiled.
[0004]
In a general hand-held concrete drill, the drive motor is arranged so that the output shaft of the motor is parallel to the bit drive shaft. If a grip is formed at the end of the drive shaft, the center of gravity will be far away from the grip, making it difficult to handle.Especially when performing drilling work on a vertical wall or when working for a long time Burden on the elderly.
[0005]
[Patent Document 1] Japanese Patent No. 2527674 [0006]
[Problems to be solved by the invention]
The present invention solves the above-mentioned problems in the prior art, and makes it possible to shorten the overall length from the chuck portion to which the core bit is mounted to the grip, set the position of the center of gravity close to the grip, and provide a concrete drill with good handleability during hand-held work. The task is to provide.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, a concrete drill according to the present invention rotates a bit drive shaft to rotate a core bit attached to the tip of the bit drive shaft, and imparts axial vibration to the core bit to concrete or the like. In a concrete drill adapted to be drilled, a grip is formed on the other end of a main body housing having a chuck for mounting a core bit on one end, and a drive motor for rotating and driving the bit drive shaft is provided on the output shaft of the motor. A vibrating mechanism that is arranged orthogonal to the bit drive shaft to transmit the rotation of the output shaft of the drive motor to the bit drive shaft and imparts vibration to the core bit is formed in the main body housing near the drive motor. Transmitting the rotation of the output shaft of the drive motor to the vibrating mechanism so that the vibrating mechanism is Characterized in that so as to drive the Ri.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings. As shown in FIGS. 1 and 2, a concrete drill 1 according to an embodiment of the present invention holds a concrete drill 1 at an upper end of a main body housing 4 in which a chuck portion 3 for mounting a core bit 2 is formed at a lower end side. A grip 5 for work is formed with both ends supported by the body housing 4, and a trigger 6 for activating the concrete drill 1 is arranged on the grip 5. A drive motor 7 for rotating the core bit 2 mounted on the chuck portion 3 via a bit drive shaft housed in the main body housing 4 is provided below the grip 5 with a drive shaft 8 of the drive motor 7. It is arranged so that the direction is parallel to the grip 5.
[0009]
Further, a vibration mechanism 9 is disposed below the drive motor 7, and the vibration mechanism 9 is rotated by a timing belt 12 via a pulley 11 mounted on a rotating shaft 10 rotated by the precursor drive motor 7. When the core bit 2 is driven and rotated, the reciprocal impact vibration is applied to the core bit 2 in the axial direction. An auxiliary grip 13 is formed at a lower portion of the main body housing 4 near the chuck portion 3 so as to protrude from the main body housing 4 substantially in parallel with the drive shaft 8 of the drive motor 7. The piercing operation can be performed by gripping the grip 13 with both hands. The auxiliary grip 13 in this embodiment also serves as an operating lever for attaching and detaching the core bit 2 to and from the chuck portion 3. The attachment and detachment of the core bit 2 to and from the chuck portion 3 via the mechanism 15 can be performed.
[0010]
As shown in FIG. 3, a bit drive shaft 16 connected to the chuck portion 3 via a speed reduction mechanism is rotatably supported and disposed in the main body housing 4, and a drive shaft of the drive motor 7 is provided. An output shaft 17 at one end of the shaft 8 is disposed near the bit drive shaft 16, and is formed by a bevel gear 18 attached to the output shaft 17 of the drive motor 7 and a bevel gear 19 attached to the outer peripheral surface of the bit drive shaft 16. The bit drive shaft 16 is linked so as to be driven to rotate by the drive motor 7. A hollow portion 20 is formed in the center of the bit drive shaft 16 along the longitudinal direction, and cooling water supplied to the concrete drill 1 through a water supply plug 21 is supplied to the water supply pipe 22 and the hollow portion of the bit drive shaft 16. The tip of the core bit 2 is supplied to the tip of the core bit 2 through 20 so as to cool the tip of the core bit 2 during drilling.
[0011]
A spur gear 23 is attached to a rotating shaft 10 rotatably supported by the main body housing 4 below the drive motor 7, and the spur gear 23 is disposed between the rotating shaft 10 and the output shaft 17. The drive shaft 7 is cooperated with a spur gear 25 attached to the output shaft 17 of the drive motor 7 via a gear 24, whereby the drive shaft 7 is rotated by driving the drive motor 7 to rotate. A timing belt 12 is wound around a pulley 11 attached to an end of the rotating shaft 10, and the vibration mechanism 9 is driven by the timing belt 12.
[0012]
As shown in FIG. 4, the vibrating mechanism 9 is separated from each other in a direction perpendicular to the bit drive shaft 16 and is rotatably supported in the main body housing 4 in parallel with each other. The eccentric weights 28 and 29 formed symmetrically with the respective operating shafts 26 and 27 and the two operating shafts 26 and 27 are attached to the respective operating shafts 26 and 27 in order to rotate them synchronously in opposite directions. The spur gears 30 and 31 are meshed with each other. A pulley 32 is attached to an end of one of the operation shafts 26, and is driven to rotate by a timing belt 12 stretched between the pulley 11 and the rotation shaft 10.
[0013]
When the drive motor 7 is driven to rotate, the operating shaft 26 is rotated via the rotating shaft 10, and the operating shafts 26 and 27, which are rotated in opposite directions by the meshing spur gears 30 and 31, rotate symmetrically. The eccentric weights 28 and 29 attached to the main body 4 are rotated to apply pulsating vibration along the axial direction of the bit drive shaft 16 to the main body housing 4. The vibration of the pulsation generated in the main body housing 4 is transmitted to the core bit 2 via the bit drive shaft 16 and acts as a pressing force for pressing the drilling blade at the tip of the core bit 2 against concrete.
[0014]
In the above embodiment, the eccentric weights 28 and 29 are attached to each other, and the vibration mechanism 9 is constituted by the pair of operating shafts 26 and 27 which are rotated in the opposite directions in synchronization with each other. The vibrating mechanism 9 is not limited to this embodiment. For example, a vibrating mechanism 9 using an eccentric cam mechanism or the like can be used.
[0015]
【The invention's effect】
As described above, according to the present invention, a grip is formed on the other end side of the main body housing having a chuck portion for mounting a core bit on one end side, and a drive motor for rotating and driving the core bit is used as an output shaft of the drive motor. Since the vibration mechanism is arranged so as to be orthogonal to the drive shaft, and a vibration mechanism for imparting vibration to the core bit is formed near the drive motor of the main body housing, and the vibration mechanism is driven by the drive motor. , The overall length from the grip to the chuck can be reduced, and the center of gravity of the entire concrete drill can be close to the grip. It is possible to reduce the burden on the worker during the work.
[0016]
Further, since the output shaft of the drive motor is arranged near the bit drive shaft and the vibrating mechanism, and the vibrating mechanism is driven by the drive motor that rotationally drives the bit drive shaft, the vibrating mechanism is driven. And a mechanism for transmitting the rotational force from the drive motor to the bit drive shaft and the vibrating mechanism can be made compact, and the concrete drill can be made compact.
[Brief description of the drawings]
FIG. 1 is a side view of a concrete drill according to an embodiment of the present invention. FIG. 2 is a rear view of the same concrete drill as in FIG. 1. FIG. 3 is a longitudinal side view showing a power transmission mechanism from a drive motor of the concrete drill in FIG. FIG. 4 is a rear view showing a vibration mechanism mounted on the concrete drill of FIG.
DESCRIPTION OF SYMBOLS 1 Concrete drill 2 Core bit 3 Chuck part 4 Main body housing 5 Grip 7 Drive motor 9 Vibration mechanism 10 Rotary shaft 11 Pulley 12 Timing belt 16 Bit drive shaft 17 Output shaft

Claims (1)

In a concrete drill in which a core bit attached to the tip of a bit drive shaft is rotated by rotating a bit drive shaft and an axial vibration is applied to the core bit to drill a hole in concrete or the like, a core bit is provided at one end side. A grip is formed on the other end side of the main body housing on which the chuck portion for mounting is formed, and a drive motor for rotating and driving the bit drive shaft is arranged such that an output shaft of the motor is orthogonal to the bit drive shaft. A vibration mechanism for transmitting the rotation of the output shaft of the drive motor to the bit drive shaft and applying vibration to the core bit is formed in the main body housing near the drive motor, and the rotation of the output shaft of the drive motor is controlled by the vibration. Concrete, wherein the vibration mechanism is driven by the drive motor by transmitting the vibration to the mechanism. Lil.

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