Table saw with dropping blade

• US 8,297,159 B2
• Filed: 08/26/2009
• Issued: 10/30/2012
• Est. Priority Date: 08/26/2009
• Status: Active Grant

• Current Assignee: Credo Technology Corporation (Robert Bosch GmbH), Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Voruganti, Ravinder, Dammertz, Ralph, Siwek, Thomas, Srinivas, Srinath, Williams, Daniel J., Oshgan, Stephen M.
• Primary Examiner(s): Alie, Ghassem
• Application Number:
  US12/548,347
• Publication Number:
  US 20110048196A1
• Time in Patent Office: 1,161 Days
• Field of Search: 834/772, 83/621, 83/58, 834/713, 83D/IG.1, 834/712, 835/81, 834/78, 834/90, 836/63, 837/81, 835/64, 144/384, 144/391, 144/427, 144/154.5, 144/356, 324/688, 324/661, 318/16, 318/480, 340/686.5, 340/686.6, 340/532
• US Class Current: 83/477.2
• CPC Class Codes: B27G 19/02 for circular saws
• CPC Class Codes: Y10T 292/696 With movable dog, catch or striker
• 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 83/2077 By kerf entering guide
• CPC Class Codes: Y10T 83/7726 By movement of the tool
• CPC Class Codes: Y10T 83/773 Work-support includes passageway for tool [e.g., slotted table]
• CPC Class Codes: Y10T 83/7734 With guard for tool
• CPC Class Codes: Y10T 83/8749 By pivotal motion

Abstract

A power tool in one embodiment is a table saw which includes a latch hold mechanism, a swing arm movable along a swing arm path between a first position adjacent the latch hold mechanism and a second position spaced apart from the latch hold mechanism, a latch movable between a first position whereat the swing arm is maintained at the first position and a second position whereat the swing arm is not maintained at the first position, an actuating device configured to transfer a force to the swing arm when the swing arm is maintained at the first position, and a control system configured to control the actuating device to transfer a force to the swing arm when the swing arm is maintained at the first position sufficient to move the latch from the first position to the second position.

Claims

1. A table saw, comprising:

a latch hold mechanism;

a swing arm movable along a swing arm path

between a first swing arm position adjacent the latch hold mechanism and a second swing arm position spaced apart from the latch hold mechanism;

said latch hold mechanism movable with respect to the swing arm;

a latch movable between a first latch position whereat the latch is engaged with the latch hold mechanism and the swing arm is maintained at the first swing arm position, and a second latch position whereat the latch is not engaged with the latch hold mechanism and the swing arm is not maintained at the first swing arm position;

an actuating device configured to transfer a force to the swing arm when the swing arm is maintained at the first swing arm position resulting in a bias on the latch in a direction toward the second latch position; and

a control system configured to control the actuating device to transfer a force to the swing arm when the swing arm is maintained at the first swing arm position sufficient to move the latch from the first latch position to the second latch position.

2. The table saw of claim 1, wherein the latch hold mechanism is biased toward a first latch hold position whereat at least one portion of the latch hold mechanism is within the swing arm path.

3. The table saw of claim 2, further comprising:

a carriage movably mounted on a frame, wherein the latch hold mechanism and the swing arm are pivotably mounted on the carriage.

4. The table saw of claim 3, further comprising;

a work-piece support surface, wherein the frame is pivotable with respect the work-piece support surface.

5. The table saw of claim 2, wherein the at least one portion of the latch hold mechanism comprises:

a plurality of rebound ledges.

6. The table saw of claim 2, further comprising:

a rebound plate mounted on a portion of the swing arm such that when the latch hold mechanism is in the first latch hold position, the rebound plate is aligned with the at least one portion of the latch hold mechanism along the swing path, the rebound plate formed from a material that is harder than the portion of the swing arm.

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

a strike plate mounted on a portion of the swing arm such that when the swing arm is in the first swing arm position, the strike plate is aligned with the actuating device, the strike plate formed from a material that is harder than the portion of the swing arm.

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

a carriage movable along a first axis which intersects a work-piece support surface to a plurality of positions;

a frame supporting the carriage; and

a stop pad mounted on the frame, wherein the swing arm is supported by the carriage and pivotable about a pivot axis extending generally parallel to the work-piece support surface, and movable along a plurality of swing arm paths, each of the plurality of swing arm paths associated with a respective one of the plurality of positions, and the stop pad is configured to intersect each of the plurality of swing arm paths.

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

a frame supporting the swing arm; and

a stop pad mounted on the frame and aligned with the swing arm path.

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

a power wheel operatively connected to an output shaft of a motor;

a blade wheel supported by the swing arm; and

a belt operatively connected to the power wheel and to the blade wheel.

11. The table saw of claim 1, wherein the output shaft defines a swing arm axis of rotation.

12. A table saw, comprising:

a latch hold mechanism;

a swing arm movable along a swing arm path between a first swing arm position adjacent the latch hold mechanism and a second swing arm position spaced apart from the latch hold mechanism;

a carriage movably mounted on a frame, wherein the latch hold mechanism and the swing arm are pivotably mounted on the carriage;

a latch movable between a first latch position whereat the swing arm is maintained at the first swing arm position,. and a second latch position whereat the swing arm is not maintained at the first swing arm position;

an actuating device configured to transfer a force to the swing arm when the swing arm is maintained at the first swing arm position; and

a control system configured to control the actuating device to transfer a force to the swing arm when the swing arm is maintained at the first swing arm position.

13. The table saw of claim 12, wherein the latch hold mechanism is biased toward a first latch hold position whereat at least one portion of the latch hold mechanism is within the swing arm path.

14. The table saw of claim 13, wherein the at least one portion of the latch hold mechanism comprises:

a plurality of rebound ledges.

15. The table saw of claim 13, further comprising:

a rebound plate mounted on a portion of the swing arm and configured such that when the latch hold mechanism is in the first latch hold position, the rebound plate is aligned with the at least one portion of the latch hold mechanism along the swing path, the rebound plate formed from a material that is harder than the portion of the swing arm.

16. The table saw of claim 12, further comprising:

a frame supporting the swing arm; and

a stop pad mounted on the frame and aligned with the swing arm path.