SAFETY GUARD ARRANGEMENT FOR CIRCULAR SAW

• US 3,613,748 A
• Filed: 09/11/1969
• Issued: 10/19/1971
• Est. Priority Date: 09/11/1969
• Status: Expired due to Term

• Current Assignee: Dolen A De Pue
• Original Assignee: Dolen A De Pue
• Inventors: De Pue, Dolen A.
• Primary Examiner(s): Schran, Donald R.
• Application Number:
  US04/857,079
• Time in Patent Office: 768 Days
• Field of Search: 143/43A,43,159H,159 144/251
• US Class Current: 30/391
• CPC Class Codes: B27G 19/04 for manually-operated power-driven circular saws

Abstract

A safety guard arrangement for a motor-driven circular saw utilizes a weight biased guard and a solenoid actuated linkage for moving the guard. The weight normally biases the guard into either a guarding position or a storage position and the guard is moved from one position to another by pulsing of the solenoid. Pulsing of the solenoid is controlled by a switch related to a switch for control of the main motor so that the solenoid is pulsed and the guard moved to the storage position when the motor is started and the solenoid is pulsed and the guard moved back in guarding position when the motor is stopped.

Claims

1. A rotary saw of the type including a frame, an electric motor carried by the frame, a circular saw blade journaled on the frame and driven by the motor, a motor control electric switch on the frame controlling electric power to the motor, a saw blade housing portion of the frame enclosing an upper portion of the saw blade, and a saw blade guard journaled on the same axis as the saw blade and movable to enclose the saw blade or expose the saw blade to allow cutting, the movement of the saw blade guard being from a guarding position covering a lower portion of the saw blade to a storage position within the saw blade housing portion of the frame, improvements in means for moving the saw blade guard from the guarding position to the storage position and vice versa, comprising;

a weight on the saw guard normally biasing the saw guard to hold it in either the guarding or storage position, a solenoid carried by the frame, a linkage connecting the solenoid with the saw guard so that when the solenoid is actuated the linkage overcomes the biasing means and moves the saw guard from one position to the other and the biasing means then holds the saw guard in the other position, a solenoid control electric switch controlling electric power To pulse the solenoid, the solenoid control switch related to the motor-controlled switch such that on closing the motor control switch, the solenoid control switch is closed to pulse the solenoid and on opening the motor control switch, the solenoid controlled switch is opened to pulse the solenoid.

2. A rotary saw of the type including a frame, an electric motor carried by the frame, a circular saw blade journaled on the frame and driven by the motor, a motor control electric switch on the frame-controlling electric power to the motor, a saw blade housing portion of the frame enclosing an upper portion of the saw blade, and a saw blade guard journaled on the same axis as the saw blade and movable to enclose the saw blade or expose the saw blade to allow cutting, the movement of the saw blade guard being from a guarding position covering a lower portion of the saw blade to a storage position within the saw blade housing portion of the frame, improvements in means for moving the saw blade guard from the guarding position to the storage position and vice versa, comprising;

means normally biasing the saw guard to hold it in either the guarding or storage position, a solenoid carried by the frame, a linkage connecting the solenoid with the saw guard so that when the solenoid is actuated the linkage overcomes the biasing means and moves the saw guard from one position to the other and the biasing means then holds the saw guard in the other position, a solenoid control electric switch controlling electric power to pulse the solenoid, the solenoid control switch related to the motor controlled switch such that on closing the motor control switch, the solenoid control switch is closed to pulse the solenoid and on opening the motor control switch, the solenoid-controlled switch is opened to pulse the solenoid, and a trigger-type switch actuator for actuating the motor control switch and solenoid control switch, the motor control switch being actuated after the solenoid control switch when the trigger is squeezed and the solenoid control switch being actuated after the motor control switch when the trigger is released.