JP2002264042A - Balanced type power rotating tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a well-balanced hand-held power rotating tool. SOLUTION: This hand-held power rotating tool is provided with a housing including a top part, a handle part and a base part relatively arranged in T- shape. A motor is arranged in the base part of the housing. An input shaft extends from the motor through the handle part and connects the motor rotatably to a gearbox located at the top part of the housing. An output shaft extends from the gearbox almost orthogonal to the longitudinal axis of the input shaft and connected to a chuck for rotation. The tool is balanced to suppress the rotation of the input shaft and output shaft within a plane during use.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD This application relates generally to power rotary tools. More particularly, the present application relates to a hand-held power rotary tool with balanced weight distribution and workability in narrow spaces.

[0002]

2. Description of the Related Art Hand-held power rotary tools are common.
Two types of pistol grip type rotary tools and right angle type rotary tools are mainly marketed. The two types of tools differ greatly in the overall orientation of the tool. A standard pistol grip rotary tool has a motor, gearbox, and output shaft, all of which are horizontally oriented inside a housing and a handle suspended from the rear of the housing. Right angle rotary tools are more vertically oriented for use in confined areas. In a right-angle rotary tool, the motor and the gearbox are vertically arranged inside the handle, and the output shaft extends horizontally from the gearbox.

One of the drawbacks of the pistol grip rotary tool is that it is relatively unbalanced. Most drills of this type have a bulky forward load with the gearbox and motor, usually the heaviest parts of the rotating tool, located in front of the handle. This results in rotational torque on the handle attached to the rear of the drill. In order to use the tool correctly, the rotational torque must first be overcome by hand. The effort spent balancing the rotational torque caused by this tip load can fatigue the user's hands and cause inaccurate tool use.

[0004] A right-angled rotary tool is generally used in applications where the working space is narrow and a pistol grip type rotary tool cannot be used. A major disadvantage of these tools is that they are difficult to use. The reason for this is that the width of the handle is usually larger than the width that can be ergonomically comfortably grasped by the user's hand because the motor is usually arranged in the handle portion of the tool. Overall, right-angled rotary tools are less ergonomically user-friendly than pistol-grip-type rotary tools, for which reason right-angled rotary tools are generally only used as special tools.

[0005]

Accordingly, it is a general object of the present application to provide a hand-held power rotary tool that avoids the disadvantages of conventional designs and yet provides additional structural and operational advantages. That is.

[0006]

An important feature is the provision of a hand-held power rotary tool that is relatively well balanced and minimizes rotational torque on the handle.

[0007] Another important feature is the provision of a hand-held power rotary tool that can be used in tight spaces.

[0008] Another important feature is the provision of a hand-held power rotary tool that is ergonomically designed to be comfortable for a user to grip by hand.

For ease of understanding the subject matter sought for protection, one embodiment is shown in the accompanying drawings. Upon review of this and the following discussion together, the subject matter sought for protection, its configuration, operation, and its advantages will be understood and appreciated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, one embodiment of a hand-held power rotary tool 10 includes a housing 11 having a top 12, a handle 13, and a base 14 arranged in a relatively T-shape. Including. The handle 13 and the base 14 are
The handle portion 13 extends longitudinally below the top portion 12.
Are located between the top 12 and the base 14. Handle portion 13 includes an ergonomic grip portion 19 with a curved surface adapted to place a user's hand around it.

The chuck 15 includes a jaw 16 for mounting a tool bit, and extends forward from the top 12. The trigger 17 protrudes forward of the handle 13 for operation control of the motor. The reverse rotation shuttle switch 18 is provided between the top 12 and the handle 13 for controlling the rotation direction of the motor.

Referring to FIG. 2, motor 22 is located within base 14 of housing 11. Input shaft 2
1 is rotatably coupled to a motor 22, passes through the handle 13 from the motor 22 and is finally rotatably coupled to a gearbox 20 located in the top 12 of the housing 11.

An output shaft 24 is also rotatably coupled to the gearbox 20 and extends therefrom at an angle substantially perpendicular to the longitudinal axis of the input shaft 21. An output shaft 24 extends from the top 12 of the housing 11 and is coupled to the chuck 15 for rotation.

A switch assembly 23 is coupled to trigger 17 and is electrically connected in circuit with motor 22 for activation. The switch assembly 23 is arranged along the upper part of the handle portion 13. The reversing shuttle switch 18 is located just above the switch assembly 23,
It is located between the top 12 and the handle 13. Shuttle switch 18 is also coupled to the motor in a known manner to control the direction of rotation. Power cord 25 is located along base 14 and is electrically coupled to motor 22 to supply power.

Referring to FIGS. 2 and 3, the power rotary tool 10 is designed to be optimal for one-handed operation. Due to the long input shaft 21, the motor 22 can be positioned below the handle 13 and the handle 13 should be adequately and ergonomically designed to provide a comfortable grip with the user's hand. It is thin. The handle portion 13 can include an ergonomically designed grip portion 19 so that the hand can be placed in a safe and comfortable position with respect to the drill. The grip portion 19 has a curved surface that matches the surface of the palm. The handle 13 may be tilted slightly about 15 degrees with respect to the axis defined by the input shaft 21 to comfortably accommodate the natural angle of the hand when drilled. The trigger 17 and the shuttle switch 18 are arranged so that they can be relatively easily reached with the fingertip of the hand gripping the grip portion 19.

Adding the power rotary tool 10 to an optimal one-handed operation design involves balancing the tools relatively. The T-shape of the housing allows the weight of the tool to be efficiently distributed and minimizes the rotational torque on the handle due to the weight. Due to the shape of the housing 11, the heaviest components of the rotary tool 10, namely the gearbox 20 and the motor 22
Can be arranged to be substantially vertical in use, minimizing rotational torque. Further, the motor 22 is connected to the handle 1
3, the rotation torque can be further reduced by setting the counter balance with respect to the chuck 15. The rotational torque generated by the weight of the components in the top 12 of the housing 11 ahead of the shaft 21 receives a reaction force from the weight of the components arranged on the base 14 of the housing 11.

A further advantage of the rotary tool is that the motor 22 is arranged below the handle 13 so that
2 is to minimize the length and improve accessibility to narrow places.

The foregoing description and the content shown in the accompanying drawings are provided by way of explanation only and are not limiting. Although a particular embodiment has been presented and described,
It will be apparent to those skilled in the art that changes and modifications can be made without departing from the broad aspects of the present application. The actual scope of protection sought is what is desired to be defined in the appended claims, with a reasonable view based on the prior art.

[Brief description of the drawings]

FIG. 1 is an external view of an embodiment of a power rotary tool.

FIG. 2 with the housing removed to show details
It is a side view of the power rotary tool.

FIG. 3 is a reduced side view of the power rotary tool of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Hand-held power rotary tool 11 Housing 12 Top part 13 Handle part 14 Base part 15 Chuck 16 Jaw 17 Trigger 18 Reverse shuttle switch 19 Grip area 20 Gear box 21 Input shaft 22 Motor 23 Switch unassembly 24 Output spindle 25 Power cable

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Stephen Sea, Carney USA Wisconsin, Present Prairie, Fifth Avenue 8911 (72) Inventor Isidro M, Alanis USA Iowa, Siaux City, Outer Drive North 2000, number 112

Claims (9)

[Claims] 1. A housing having a generally T-shaped housing having a front end and a rear end, a handle joined to the top between the front and rear ends, and a base suspended from the handle. A motor disposed in the base; a gearbox disposed in the top; an input shaft rotatably coupling the motor and the gearbox; coupled to the gearbox and from there. A balanced rotary tool comprising: an output shaft extending in a direction substantially perpendicular to the input shaft. 2. The rotating tool according to claim 1, wherein the handle portion includes a grip region inclined at an angle of about 15 degrees with respect to an axis defined by the input shaft. 3. The rotary tool according to claim 1, further comprising a trigger mechanism disposed between the grip area and the top. 4. The rotary tool according to claim 1, further comprising a slidable direction control mechanism arranged so as to be accessible by a hand of a user holding the handle portion. 5. The system of claim 1, wherein the handle defines an axis that passes through a gearbox forward from the input shaft.
The rotary tool according to 1. 6. The rotary tool according to claim 1, further comprising a power cord conductively coupled to the motor. 7. The rotary tool according to claim 1, wherein the handle portion includes an ergonomically shaped grip region. 8. A top having a tip and a rear end, a handle joined to the top between the tip and the rear and including an ergonomic grip region, and a base suspended from the handle. A motor disposed within the base; a power cord conductively coupled to the drive motor and extending through the base; a gearbox disposed within the top; and A balanced rotation comprising an input shaft rotatably coupled to the gearbox; and an output spindle rotatably coupled to the gearbox and extending therefrom at an angle substantially perpendicular to the input shaft. tool. 9. The rotating tool according to claim 8, wherein said housing is generally T-shaped.