Miter saw having mechanism for adjusting tilting angle of circular saw blade

• US 7,331,264 B2
• Filed: 06/30/2005
• Issued: 02/19/2008
• Est. Priority Date: 06/30/2004
• Status: Active Grant

• Current Assignee: Koki Holdings Co., Ltd.
• Original Assignee: Hitachi KOKI Company Limited (Koki Holdings Co., Ltd.)
• Inventors: Imamura, Ryuichi, Terashima, Hideaki, Ushiwata, Shigeharu, Ozawa, Hiromi
• Primary Examiner(s): Choi; Stephen
• Application Number:
  US11/169,918
• Publication Number:
  US 20060000331A1
• Time in Patent Office: 964 Days
• Field of Search: 834/713, 834/73, 835/81, 835/221.5, 834/72, 834/77, 834/771, 834/90, 836/984.1, 836/983.1
• US Class Current: 83/471.3
• CPC Class Codes: B23D 45/044 the saw blade being adjustable according to angle of cut B23D45/025 takes precedence
• CPC Class Codes: B23D 47/025 of tables
• CPC Class Codes: B23D 59/008 comprising computers
• CPC Class Codes: B27B 5/29 Details; Component parts; Accessories
• CPC Class Codes: Y10T 83/7697 Tool angularly adjustable relative to work-support
• CPC Class Codes: Y10T 83/7705 Adjustable angular relationship
• CPC Class Codes: Y10T 83/7726 By movement of the tool
• CPC Class Codes: Y10T 83/7788 Tool carrier oscillated or rotated
• CPC Class Codes: Y10T 83/8773 Bevel or miter cut

Abstract

A miter saw including a base, turntable, and circular saw unit supported to the turntable. A turntable is rotatable about its axis. The turntable has a tilting motion support. A support section has a tilt section tiltingly movable relative to the tilt motion support, and pivotally movably supports the circular saw unit. A clamp shaft is provided for clamping the tilting section to the tilt motion support. A tilt amount fine control unit is provided for performing fine control to the tilting angle, and includes an arcuate gear teeth section provided at the tilt motion support, rotation shaft for moving the arcuate gear teeth, and adjustment knob supported on the clamp shaft for rotating the rotation shaft. A neck table section is provided at a front side of the turntable, and includes a digital display for displaying a lateral tilting angle of the circular saw unit.

Claims

1. A miter saw comprising:

a base section that supports a workpiece thereon, the base section having a tilt support;

a circular saw unit rotatably supporting a circular saw blade;

a support section pivotally movably supporting the circular saw unit at a position above the base section, the support section having a tilting section laterally tiltingly movable together with the circular saw unit and supported to the base section, the tilt support supporting the tilting section in contact therewith, the tilting section being tiltingly movable along a tilting locus;

a clamp mechanism that presses the tilting section against the tilt support for fixing a lateral tilting posture of the support section;

a biasing member that provides a frictional force between the tilt support and the tilting section so as to resist movement of the tilting section; and

a tilt amount fine control unit disposed between the tilting section and the tilt support, where the tilt amount fine control unit allows adjustment of a fine lateral tilting posture of the support section while the frictional force is being applied between the tilt support and the tilting section by the biasing member.

2. The miter saw as claimed in claim 1, wherein the tilt amount fine control unit comprises:

an arcuate section provided at the tilting locus and movable integrally with the tilting section;

a rotation shaft rotatably supported to the tilt support and associated with the arcuate section for tiltingly moving the tilting section; and

an adjustment knob rotatably supported to the tilt support and associated with the rotation shaft for rotating the rotation shaft about an axis thereof.

3. The miter saw as claimed in claim 2, wherein the rotation shaft is drivingly connected to the arcuate section, and the adjustment knob is drivingly connected to the rotation shaft.

4. The miter saw as claimed in claim 2, wherein the rotation shaft is movable between an associating position where the rotation shaft is associatable with the arcuate section and a separated position where the rotation shaft is away from the arcuate section.

5. The miter saw as claimed in claim 2, wherein the clamp mechanism comprises a clamp shaft supported to the tilt support, and

wherein the adjustment knob is rotatably supported on the clamp shaft.

6. The miter saw as claimed in claim 2, comprising a digital display that displays a tilting angle of the tilting section relative to the tilt support.

7. The miter saw as claimed in claim 6, wherein the base section comprises a base, and a turntable supported on the base and rotatable about a rotation axis relative to the base, the turntable comprising a circular table section having a front end and a rear end to which the support section is supported, and a neck table section extending frontwardly from the front end in a diametrical direction of the circular table section, the digital display being disposed at the neck table section.

8. The miter saw as claimed in claim 2, wherein the clamp mechanism is movable between a non-fixing position where the tilting motion of the tilting section relative to the tilt support is permitted and a fixing position where the tilting section is in intimate contact with the tilt support to prevent the tilting section from being tiltingly moved relative to the tilt support, rotation of the rotation shaft being prevented only when the clamp mechanism is at the fixing position.

9. The miter saw as claimed in claim 8, comprising a tilting motion restraining mechanism that restricts the tilting motion of the tilting section relative to the tilt support when the clamp mechanism is at the non-fixing position.

10. The miter saw as claimed in claim 2, wherein the adjustment knob provides a rotation angle greater than a tilting angle of the tilting section relative to the tilt support.

11. The miter saw as claimed in claim 1, wherein the support section comprises:

a holder section having a lower end supported to the base section and having an upper end provided with a slide guide portion; and

a slide section slidably supported by the slide guide portion and extending in a direction parallel with a line which is an intersection of the base section and the circular saw blade, the circular saw unit being pivotally movably supported to the slide section.

12. The miter saw as claimed in claim 1, wherein the tilt amount fine control unit comprises a gear mechanism including a gear portion that permits the tilting section to tilt a fine angle upon revolution of the gear portion, the gear mechanism being configured to perform adjustment of a fine tilting angle throughout an entire tiltable region of the tilting section.

13. A miter saw comprising:

a base section that supports a workpiece thereon, the base section having a tilt support;

a circular saw unit rotatably supporting a circular saw blade;

a support section pivotally movably supporting the circular saw unit at a position above the base section, the support section having a tilting section laterally tiltingly movable together with the circular saw unit and supported to the base section, the tilt support supporting the tilting section in contact therewith, the tilting section being tiltingly movable along a tilting locus;

a rotatable lever that fixes the tilting section to the tilt support upon rotating operation;

a biasing member configures to provide a frictional force between the tilt support and the tilting section so as to resist a movement of the tilting section; and

a rotatable adjustment knob movable along with the tilting section and associated with the tilt support, where the rotatable adjustment knob allows adjustment of a fine lateral tilting posture of the support section while the frictional force is being applied between the tilt support and the tilting section by the biasing member.

14. The miter saw as claimed in claim 13, wherein the lever and the adjustment knob provide a relationship that allows an operator to operate the lever at his one hand and to operate the adjustment knob at his another hand.

15. The miter saw as claimed in claim 13, further comprising a fine control unit comprising a gear mechanism connected to the rotatable adjustment knob, the fine control unit including a gear portion that permits the tilting section to tilt a fine angle upon revolution of the gear portion through operation of the rotatable adjustment knob, the gear mechanism being configured to perform adjustment of a fine tilting angle throughout an entire tiltable region of the tilting section.