Drop arm reset method

• US 10,427,227 B2
• Filed: 03/04/2016
• Issued: 10/01/2019
• Est. Priority Date: 03/12/2015
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH, Robert Bosch Tool Corporation (Robert Bosch GmbH)
• Original Assignee: Robert Bosch Tool Corporation (Robert Bosch GmbH)
• Inventors: Doumani, Robert S., Laliberte, Eric, Szweda, Timothy, Talesky, Mark
• Primary Examiner(s): Chang, Rick K
• Application Number:
  US15/060,788
• Publication Number:
  US 20160263682A1
• Time in Patent Office: 1,306 Days
• CPC Class Codes: B23D 45/067 the saw blade being adjustable according to depth or angle of cut
• CPC Class Codes: B23D 47/00 Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts constructional features of these parts per se B23Q; details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00
• 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

Abstract

A method of resetting a drop arm assembly in a power tool assembly from a first drop arm assembly position whereat a portion of a shaping device mounted on the drop arm assembly does not extend above a workpiece support surface, includes removing a throat plate from a throat plate opening, moving at least a portion of a blade wrench downwardly through the throat plate opening, operably coupling the blade wrench with an arbor shaft of a drop arm assembly, releasing a first latch from engagement with a drop arm frame of the drop arm assembly after removing the throat plate, pulling the coupled blade wrench in an upwardly direction to a second drop arm assembly position whereat the portion of the shaping device extends above a workpiece support surface, and latching the drop arm assembly at the second drop arm assembly position with a second latch.

Claims

1. A method of resetting a drop arm assembly in a power tool assembly from a first drop arm assembly position whereat a portion of a shaping device mounted on the drop arm assembly does not extend above a workpiece support surface, comprising:

removing a throat plate from a throat plate opening in the workpiece support surface;

moving at least a portion of a blade wrench downwardly through the throat plate opening;

operably coupling the blade wrench with an arbor shaft of the drop arm assembly;

releasing a first latch from engagement with a drop arm frame of the drop arm assembly after removing the throat plate;

pulling the blade wrench in an upwardly direction to a second drop arm assembly position whereat the portion of the shaping device extends above a workpiece support surface while the blade wrench is operably coupled with the arbor shaft; and

latching the drop arm assembly at the second drop arm assembly position with a second latch.

2. The method of claim 1, further comprising:

removing a reaction plug from an actuator housing;

removing a first actuator from the actuator housing;

installing a second actuator in the actuator housing; and

causing the second actuator to move the second latch from a first latch position whereat the drop arm assembly cannot be moved from the first drop arm assembly position to the second drop arm assembly position, to a second latch position whereat the drop arm assembly can be moved from the first drop arm assembly position to the second drop arm assembly position, by installing the reaction plug in the actuator housing.

3. The method of claim 2, further comprising:

coupling an electrical connector with the second actuator prior to causing the second actuator to move the second latch.

4. The method of claim 3, wherein causing the second actuator to move the second latch comprises causing the second actuator to move the second latch against a bias produced by a biasing device configured to bias the second latch toward the first position.

5. The method of claim 4, wherein installing the second actuator in the actuator housing comprises:

inserting a portion of an actuator cartridge supporting the first and second actuator into a slit on a motor side of the actuator housing.

6. The method of claim 5, wherein causing the second actuator to move the second latch comprises:

causing a portion of the actuator cartridge outside of the actuator housing to move downwardly from a position above a finger plate portion of the actuator housing.

7. The method of claim 5, wherein causing the second actuator to move the second latch comprises:

threadedly engaging the actuator housing with the reaction plug.

8. The method of claim 3, wherein pulling the blade wrench comprises:

moving the second latch from the second latch position in a direction away from the first latch position by forcing a latch pin of the drop arm assembly against a lower portion of the second latch with the second latch in the second latch position; and

moving the latch pin into a latch pin receiving area of the second latch after moving the second latch from the second latch position in the direction away from the first latch position.

9. The method of claim 3, wherein removing the throat plate comprises:

rotating a camming device rotatably mounted at a location adjacent to the throat opening in a first direction to unlock a throat plate; and

removing the throat plate to expose the arbor shaft with the camming device still mounted.

10. The method of claim 9, further comprising:

inserting the throat plate in the throat plate opening after latching the drop arm assembly at the second drop arm assembly position; and

rotating the camming device in a second direction opposite the first direction to cam a first camming surface portion of the camming device against a second camming surface portion of the inserted throat plate, thereby locking the throat plate within the throat opening.

11. The method of claim 10, wherein removing the throat plate further comprises;

rotating the camming device in the first direction to cam a third camming surface portion of the camming device against a fourth camming surface portion of the unlocked throat plate, thereby forcing the throat plate in a direction outwardly from the throat opening.

12. The method of claim 11, wherein rotating the camming device in the second direction comprises:

rotating a body portion of the camming device within a knob well defined by the workpiece support surface.

13. The method of claim 12, wherein rotating the camming device in the second direction comprises:

using one of at least two finger holes extending downwardly from an uppermost surface of the camming device as leverage in rotating the camming device.

14. The method of claim 12, wherein inserting the throat plate in the throat plate opening comprises:

inserting at least one tab of the throat plate within at least one tab receiving structure of the workpiece support surface, wherein the camming device is located adjacent a first end portion of the throat plate opening and the at least one tab receiving structure is located adjacent a second end portion of the throat plate opening opposite to the first end portion.