Production table saw

• US 4,962,685 A
• Filed: 10/27/1988
• Issued: 10/16/1990
• Est. Priority Date: 10/27/1988
• Status: Expired due to Fees

• Current Assignee: Oscar E. Hagstrom
• Original Assignee: Oscar E. Hagstrom
• Inventors: Hagstrom, Oscar E.
• Primary Examiner(s): Yost, Frank T.
• Assistant Examiner(s): Smith, Scott A.
• Application Number:
  US07/263,053
• Time in Patent Office: 719 Days
• Field of Search: 83/397, 83/478, 83/471.2, 83/471.3, 83/477.2, 83/490, 83/435.1, 83/544, 83/438, 83/440.2, 83/444, 83/447, 83/446
• US Class Current: 83/397
• CPC Class Codes: B23D 45/06 with a circular saw blade arranged underneath a stationary work-table
• CPC Class Codes: B27G 19/02 for circular saws
• CPC Class Codes: Y10T 83/606 Interrelated tool actuating means and guard means
• CPC Class Codes: Y10T 83/6608 By rectilinearly moving work carriage
• CPC Class Codes: Y10T 83/732 With guard
• CPC Class Codes: Y10T 83/739 Positively confines or otherwise determines path of work
• CPC Class Codes: Y10T 83/741 With movable or yieldable guide element
• 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 83/7788 Tool carrier oscillated or rotated

Abstract

A production table saw is disclosed that includes a saw blade that is movable from an unexposed position that is fully received by a work stand to an exposed position wherein at least a portion of the blade is exposed through a blade slot in the working surface of the table. A foot operated mechanism that includes a foot pedal is provided to move the saw blade between the unexposed position to the exposed position which is suitable for cutting. The foot operated mechanism cooperates with a safety guard to protect the blade while the saw is in operation. The connection between the foot pedal and the safety guard is arranged to insure that the safety guard is always placed over the saw blade when the blade is exposed through the blade slot.

Claims

1. A production saw comprising:

a work stand having an internal cavity, a working surface, a blade slot in the working surface, the rotatable plate carrying said blade slot;

a saw blade movable from an unexposed position fully received by said work stand to an exposed position wherein at least a portion of the blade is exposed through said blade slot to a facilitate cutting;

drive means for driving the saw blade to facilitate cutting through a workpiece;

a safety guard for protecting the blade while the saw is in operation;

foot operated means for moving the saw blade between said unexposed position and said exposed position at all working orientations of the rotatable plate, the foot operated means cooperating with the safety guard to insure that the safety guard is always placed over the saw blade when the blade is exposed through said blade slot and for lifting the safety guard away from the blade slot when the blade is in said unexposed position,

said foot operated means including a rocker arm that carried said saw blade and said drive means and a foot pedal mounted to said work stand and coupled to the rocker arm such that movements of the foot pedal cause the rocker arm to pivot, wherein said pivot movements of said rocker arm translate said blade between said exposed and unexposed positions,

said foot operated means further including means for coupling said foot pedal to said rocker arm to translate movements of said foot pedal to rotations of said rocker arm for the ingress and egress of the saw blade through said blade slot, said cable mans including

an elongated cable having a first end attached to said foot pedal and a second end attached to said rocker arm, and

a plurality of pulleys defining a specific path that the cable must follow, a first one of said pulleys being mounted at the pivot point of said rotatable plate.

2. A production saw as recited in claim 1 wherein said saw blade and said drive means are carried by the rotatable plate to insure that the orientation of the blade will vary with rotations of the rotatable plate.

3. A production saw as recited in claim 2 further comprising a mounting plate pivotally coupled to the rotatable plate for carrying said drive means and said saw blade, wherein pivotal movements of said mounting plate vary the bevel angle of the saw blade and wherein the foot-operated means operates to move the saw blade between said exposed and unexposed positions regardless of the orientation or bevel angle of the saw blade.

4. A production saw as recited in claim 1 further comprising linkage means for cooperating with said rocker arm to insure that said safety guard is always placed over the saw blade when the blade is exposed through said blade slot.

5. A production saw as recited in claim 4 wherein said linkage means includes a first linkage bar that is pivotally mounted to said work stand in a position such that said rocker arm or an element carried thereby will engage said first linkage bar only when said saw blade is not exposed through said blade slot, said linkage means being arranged such that when said first linkage bar is not engaged by said rocker arm or an element carried thereby, the safety guard will be placed over said blade slot.

6. A production saw as recited in claim 1 wherein the workstand further includes a cabinet having said internal cavity and a plurality of legs extending downward from the cabinet for supporting the cabinet, and wherein the work surface further includes a turntable fixedly mounted to the cabinet.

7. A production saw as recited in claim 1 further comprising switch means for activating said drive means to drive the saw blade, said switch means including intermediate means for starting the motor only when the foot operated means has been activated.

8. A production saw as recited in claim 7 wherein said switch means further includes a power switch having on and off positions, wherein said power switch must be in the on position for the production saw to operate.

9. A production saw comprising:

a work stand having a working surface, a cabinet with an internal cavity, a fixed work table coupled to the top of said rotatable plate that forms a portion of the working surface and includes a blade slot having a longitudinal axis;

a rocker arm pivotally coupled to the rotatable plate;

a saw blade carried by said rocker arm and movable from an unexposed position fully received by said work stand to an exposed position wherein at least a portion of the blade is exposed through said blade slot;

drive means carried by the rocker arm for driving the saw blade to facilitate cutting through a workpiece;

a safety guard for protecting the blade while the saw is in operation;

foot operated means for moving the saw blade between said unexposed position and said exposed position which is suitable for cutting at all working orientations of the rotatable plate, the foot operated means cooperating with the safety guard to insure that the safety guard is always placed over the saw blade when the blade is exposed through said blade slot and for lifting the safety guard away from the blade slot when the saw blade is in said unexposed position, the foot operated means including a foot operated pedal mounted to said work stand and cable mans for coupling said foot pedal to said rocker arm to translate movements of said foot pedal to rotations of said rocker arm for the egress of said saw blade through said blade slot, said cable means including,

an elongated cable having a first end attached to said foot pedal and a second end attached to said rocker arm, and

a plurality of pulleys defining a specific path that the cable must follow, a first one of said pulleys being mounted at the pivot point of said rotatable plate; and

a mounting plate pivotally coupled to said rotatable plate wherein the rotational axis of the mounting plate is substantially parallel to the longitudinal axis of said blade slot, said rocker arm being carried by said mounting plate and having an axis of rotation substantially orthogonal to the rotational axis of the mounting plate such that the pivotal movements of said mounting plate will vary the bevel angle of the saw blade.

10. A production saw as recited in claim 9 further comprising linkage means for cooperating with said rocker arm to insure that said safety guard is always placed over the saw blade when the blade is exposed through said blade slot.

11. A production saw as recited in claim 10 wherein said linkage means includes a first linkage bar that is pivotally mounted to said work stand in a position such that said rocker arm or an element carried thereby will engage said first linkage bar only when said saw blade is not exposed through said blade slot, said linkage means being arranged such that when said first linkage bar is not engaged by said rocker arm or an element carried thereby, the safety guard will be placed over said blade slot.

12. A production saw as recited in claim 9 wherein mounting plate is coupled to said rotatable plate in a manner that insures that the saw blade will remain within the confines of the blade slot regardless of the pivotal position of the mounting plate.

13. A production saw as recited in claim 9 further comprising a guide fence for demountable attachment to the work table for supporting a workpiece during cutting.

14. A production saw as recited in claim 9 further comprising a stabilizer plate for securing said first pulley to said rotatable plate.

15. A production saw as recited in claim 9 further comprising an angle adjustment means for precisely measuring the pivotal position of the rotatable plate.

16. A production saw, comprising:

a work stand having an internal cavity, a working surface, a blade slot in the working surface, and a rotatable plate that forms a portion of said working surface, the rotatable plate carrying said blade slot;

a saw blade movable from an unexposed position fully received by said work stand to an exposed position wherein at least a portion of the blade is exposed through said blade slot to facilitate cutting;

drive means for driving the saw blade to facilitate cutting through a workpiece;

a safety guard for protecting the blade while the saw is in operation;

foot operated means for moving the saw blade between said unexposed position and said exposed position at all working orientations of the rotatable plate, the foot operated means cooperating with the safety guard to insure that the safety guard is always placed over the saw blade when the blade is exposed through said blade slot and for lifting the safety guard away from the blade slot when the blade is in said unexposed position;

guide means for positioning the workpiece relative to the saw blade, the guide means including a contact surface for positioning the workpiece as it passes through the saw blade;

a carriage rod carried by the guide means, the carriage rod having a longitudinal axis; and

a push plate slideably mounted to the carriage rod and adapted to engage the workpiece without holding the workpiece in the vicinity of the saw by pushing on said plate, the push plate having a locked position wherein the push plate is held in place in a position that does not protrude beyond the contract surface of the guide means.