Table saw with reset mechanism

• US 8,651,001 B2
• Filed: 11/13/2012
• Issued: 02/18/2014
• Est. Priority Date: 08/26/2009
• Status: Active Grant

• Current Assignee: Robert Bosch Tool Corporation (Robert Bosch GmbH)
• Original Assignee: Robert Bosch GmbH
• Inventors: Groth, Brady J., Mehta, Amit K., Doumani, Robert S.
• Primary Examiner(s): Alie, Ghassem
• Application Number:
  US13/675,406
• Publication Number:
  US 20130068078A1
• Time in Patent Office: 462 Days
• Field of Search: 834/772, 83/58, 835/64, 83/621, 834/713, 83D/IG.1, 834/712, 835/81, 834/78, 834/90, 836/63, 837/81, 144/384, 144/391, 144/427, 144/154, 144/356, 340/686.5, 340/686.6, 340/532, 324/688, 324/661, 318/16, 318/480
• US Class Current: 83/477.2
• CPC Class Codes: B23D 45/061 the saw blade being mounted on a carriage
• CPC Class Codes: B23D 45/067 the saw blade being adjustable according to depth or angle of cut
• CPC Class Codes: B23D 47/08 of devices for bringing the circular saw blade to the workpiece or removing same therefrom
• CPC Class Codes: B23D 59/002 for the position of the saw blade mounting for swiveling or tilting a circular saw blade B27B5/36; portable power-driven circular saws with adjustment for cutting depth or amount of tilting B27B9/02
• CPC Class Codes: B27G 19/02 for circular saws
• CPC Class Codes: Y10T 83/081 With randomly actuated stopping means
• CPC Class Codes: Y10T 83/089 Responsive to tool characteristic
• CPC Class Codes: Y10T 83/773 Work-support includes passageway for tool [e.g., slotted table]
• CPC Class Codes: Y10T 83/8749 By pivotal motion

Abstract

A power tool in one embodiment includes a swing arm movable along a swing arm path between an upper first swing arm position and a lower second swing arm position, a latch hold mechanism movable between a first latch hold position adjacent to the swing path and a second latch hold position whereat at least a portion of the latch hold mechanism is within the swing path, an actuator configured to force the swing arm assembly away from the first swing arm position and toward the second swing arm position, a swing arm reset configured to pivot the swing arm from the second swing arm position to the first swing arm position, a latch hold reset configured to pivot the latch hold mechanism from the second latch hold position to the first latch hold position, and a control system configured to control the actuator.

Claims

1. A table saw, comprising:

a work-piece support surface;

a blade support shaft automatically retractable along a retraction path from a first position to a second position in response to a sensed condition, wherein the second position is more distal to the work piece support surface than the first position;

a support shaft reset mechanism configured to (i) move the blade support shaft from the second position to the first position in response to a user applied force, and (ii) not interfere with automatic movement of the blade support shaft along the retraction path from the first position to the second position in response to the sensed condition;

a latch hold mechanism movable between a first latch hold position adjacent to the retraction path and a second latch hold position whereat at least a portion of the latch hold mechanism is within the retraction path;

a latch hold reset mechanism configured to move the latch hold mechanism from the second position to the first position in response to a user applied force, the latch hold reset mechanism has a knob positioned outside of a table housing, a shaft extending from the knob to a location within the table saw housing; and

a control system;

configured to cause the blade support shaft to retract along the retraction path in response to the sensed condition.

2. The table saw of claim 1, wherein the shaft is pivotably attached directly to the latch hold.

3. The table saw of claim 1, wherein the shaft is pivotably attached to the latch hold through one or more intermediate shafts.

4. The table saw of claim 1, wherein the latch hold reset comprises:

a structure fixedly attached to the latch hold and shaped to mate with a latch hold reset handle.

5. The table saw of claim 4, wherein the structure is shaped like a nut.

6. The table saw of claim 1, further comprising:

a first structure with a first pivot configured to pivot the blade support shaft along the retraction path, wherein the support shaft reset mechanism comprises a second pivot configured to pivot the blade support shaft along the retraction path.

7. The table saw of claim 6, wherein the first structure is a carriage movable along an axis toward or away from the work-piece support surface and the support shaft reset mechanism is pivotably supported by the carriage through the second pivot.

8. The table saw of claim 1, wherein the support shaft reset mechanism further comprises:

a handle extending outwardly from a table saw housing.

9. The table saw of claim 8, wherein a portion of the handle located outwardly from the table saw housing is removable from the rest of the support shaft reset mechanism.

10. The table saw of claim 1, wherein the blade support shaft is supported by a swing arm assembly, the support shaft reset mechanism further comprising:

a control arm pivotably connected to the swing arm assembly; and

a belt operably connected to the control arm.

11. The table saw of claim 10, the support shaft reset mechanism further comprising:

a handle operably connected to the belt.

12. The power tool of claim 11, wherein:

the belt defines a first side extending between a pair of pulleys and a second side extending between the pair of pulleys;

the first side is in opposition to the second side;

the control arm is operably connected to the first side; and

the handle is operably connected to the second side.

13. The power tool of claim 12, wherein the handle is removably connectable to the belt.

14. The power tool of claim 13, wherein the handle is a miter gauge fence handle.

15. The power tool of claim 13, further comprising:

an access panel configured to provide access to the belt.