Drilling Device

• US 20130028674A1
• Filed: 04/12/2011
• Published: 01/31/2013
• Est. Priority Date: 04/12/2010
• Status: Abandoned Application

• Current Assignee: Hitachi KOKI Company Limited (Koki Holdings Co., Ltd.)
• Original Assignee: Hitachi KOKI Company Limited (Koki Holdings Co., Ltd.)
• Inventors: Okubo, Takahiro, Abe, Satoshi, Iwata, Kazutaka
• Application Number:
  US13/636,098
• Publication Number:
  US 20130028674A1
• Time in Patent Office: Days
• US Class Current: 408/16
• CPC Class Codes: B23B 49/00 Measuring or gauging equipment on boring machines for positioning or guiding the drill; Devices for indicating failure of drills during boring; Centering devices for holes to be bored marking-out equipment B25H7/00; measuring devices, gauges G01B
• CPC Class Codes: B25D 16/006 Mode changers; Mechanisms connected thereto
• CPC Class Codes: B25D 2211/061 Swash-plate actuated impulse-driving mechanisms
• CPC Class Codes: B25D 2216/0023 Tools having a percussion-and-rotation mode
• CPC Class Codes: B25D 2216/0038 Tools having a rotation-only mode
• CPC Class Codes: B25F 5/008 Cooling means
• CPC Class Codes: Y10T 408/21 with signal, indicator, illuminator or optical means

Abstract

A drilling device drilling to a desired depth without a gauge. The drilling device includes a distance sensor positioned on an imaginary line spanning between a front end of the housing and a hand gripped portion. The distance sensor is away form a front end of a gear housing by a distance Ls. The distance sensor provides an effective measurement range. The relationship of L1≦Ls and Ls+Lb≦L2 is satisfied where L1 represents a distance between the distance sensor and a point closest to the distance sensor and defining a lower limit of the effective measurement range, L2 represents a distance between the distance sensor and a point farthest from the distance sensor and defining an upper limit of the effective measurement range, and Lb represents a distance between the front end of the housing and a tip end of the end bit.

Claims

1. A drilling device including:

a housing having a rear end portion and a front end portion to which an end bit is detachably attachable, the end bit being configured to form a bore in a workpiece;

a drive power source accommodated in the housing; and

a power transmission mechanism transmitting a driving force generated in the power source to the end bit;

characterized by

a distance sensor provided at the housing and configured to measure a distance from the distance sensor to a surface of the workpiece, characterized in that

the distance sensor provides an effective measurement range capable of performing a measurement of a distance within a predetermined margin of error, as long as the surface of the workpiece positioned ahead of the housing is spaced away from the distance sensor within a predetermined region; and

the relationship of L1≦

Ls and Ls+Lb≦

L2 is satisfied where Ls represents a distance in a frontward/rearward direction between a front end of the housing and the distance sensor, Lb represents a distance in the frontward/rearward direction between the front end of the housing and a tip end of the end bit, L1 represents the a distance in the frontward/rearward direction between the distance sensor and a point closest to the distance sensor and defining a lower limit of the effective measurement range, and L2 represents a distance in the frontward/rearward direction between the distance sensor and a point farthest from the distance sensor and defining an upper limit of the effective measurement range.

2. The drilling device as claimed in claim 1, characterized in that the drive power source comprises a motor having an output shaft outputting a rotation force;

the drilling device further comprises a fan rotatable integrally with a rotation of the output shaft; and

the housing is formed with a front side air passage that allows air blown from the fan to flow along a front portion of the distance sensor.

3. The drilling device as claimed in claim 1, characterized in that the drive power source comprises a motor having an output shaft outputting a rotation force,

the drilling device further comprises a fan rotatable integrally with a rotation of the output shaft;

and

the housing is formed with a rear side air passage that allows air blown from the fan to flow along a rear portion of the distance sensor.

4. The drilling device as claimed in claim 1, characterized in that the drive power source comprises a motor;

and

the housing comprises a motor housing accommodating therein the motor, and a mechanism housing accommodating therein the power transmission mechanism, the distance sensor being fixed to the motor housing.

5. The drilling device as claimed in claim 1, characterized in that the housing defines a center of gravity position, and

the distance sensor is positioned on or adjacent to the center of gravity position.

6. The drilling device as claimed in claim 1, characterized in that the housing comprises a handle portion having a gripped portion held by a middle finger and an annular finger of the user, an imaginary line spanning between the front end of the housing and the gripped portion;

and

the distance sensor is positioned on the imaginary line.

7. The drilling device as claimed in claim 1, characterized by an elastic member interposed between the housing and the distance sensor, the distance sensor being fixed to the housing through the elastic member.