Compound miter saw

• US 4,934,233 A
• Filed: 06/29/1988
• Issued: 06/19/1990
• Est. Priority Date: 06/29/1988
• Status: Expired due to Term

• Current Assignee: Home Depot USA Incorporated (The Home Depot, Inc.)
• Original Assignee: Emerson Electric Company
• Inventors: Mitchell, Richard L., Brundage, Richard B.
• Primary Examiner(s): Yost, Frank T.
• Assistant Examiner(s): Jones, Eugenia A.
• Application Number:
  US07/213,277
• Time in Patent Office: 720 Days
• Field of Search: 83/397, 83/468.3, 83/468.7, 83/471.3, 83/473, 83/477.2, 83/478, 83/490, 83/581
• US Class Current: 83/397
• CPC Class Codes: B23D 45/044 the saw blade being adjustable according to angle of cut B23D45/025 takes precedence
• CPC Class Codes: B23D 59/006 for removing or collecting chips
• CPC Class Codes: B23Q 1/5412 followed perpendicularly by a single rotating pair
• CPC Class Codes: B27B 27/04 arranged perpendicularly to the plane of the saw blade
• CPC Class Codes: B27G 19/02 for circular saws
• CPC Class Codes: B27G 5/02 for sawing mitre joints; Mitre boxes guide fences for timber in sawing machines B27B27/06
• CPC Class Codes: Y10T 83/606 Interrelated tool actuating means and guard means
• CPC Class Codes: Y10T 83/762 Angularly relative to plane of cut; e.g., miter
• CPC Class Codes: Y10T 83/7647 Adjustable
• CPC Class Codes: Y10T 83/7697 Tool angularly adjustable relative to work-support
• CPC Class Codes: Y10T 83/7734 With guard for tool
• CPC Class Codes: Y10T 83/7788 Tool carrier oscillated or rotated
• CPC Class Codes: Y10T 83/857 Calibrated scale or indicator
• CPC Class Codes: Y10T 83/8773 Bevel or miter cut

Abstract

In a compound miter saw or the like having a selectively rotatable turntable mounted on a supporting frame and a power driven saw blade pivotally mounted on the turntable between a lowered full cut position and a raised full retract position, the improvements comprising a work supporting fence that is maintained in alignment with a turntable slot while the turntable, including associated saw blade slot, is positioned for desired miter cuts; and the work supporting fence also being accurately and effectively clamped relative to the supporting frame, in both front and rear work supporting fence positions. Additional improvements include a swinging blade guard for the power driven saw blade having a pivot center eccentrically offset upwards from the shaft on which the saw blade rotates and back toward the pivotal mounting of the saw on the turntable, to facilitate access to the saw blade shaft and precludes interference with bevel cuts; and first and second transversely extending closed cylinders between the turntable and the saw, enabling pivotal movement of the saw between full cut and full retract positions, while also permitting bevel pivotal adjustment of the saw relative to the turntable.

Claims

1. In a compound miter saw, a supporting frame, a turntable selectively rotatably mounted on said supporting frame and including a handle and index spring assembly for selectively rotatably positioning said turntable relative to said supporting frame, a power driven saw blade pivotally mounted on said turntable along a predetermined path relative to said turntable, and said turntable having saw blade slot means for receiving the saw blade therein, the improvement comprising:

a work supporting fence mounted on said supporting frame and including a pair of work engaging surfaces longitudinally aligned across the saw blade slot means, said work supporting fence including a depending arm extending through said saw blade slot means and being received within an elongated opening in said index spring, to enable said turntable and saw blade slot means to be positioned relative to said power driven saw blade, while said work supporting fence is maintained in alignment relative to said saw blade slot means as the depending arm of said work supporting fence moves within the elongated opening of said index spring.

2. The improvement as defined in claim 1 wherein said saw blade slot means in said turntable includes an elongated slot for receiving said saw blade and a corresponding opening connected to said elongated slot and underlying said work supporting fence.

3. The improvement as defined in claim 2 wherein said work supporting fence has a complementary opening generally vertically aligned with the opening of said saw blade slot means in said turntable.

4. The improvement as defined in claim 3 wherein said supporting frame includes a centrally positioned through opening, and said turntable is provided with a complementary shaped and circumferentially extending depending flange rotatably received within said centrally positioned through opening of said supporting frame.

5. The improvement as defined in claim 4 wherein said handle includes a handle extension underlying said supporting frame and being attached to the circumferentially extending depending flange of said turntable.

6. The improvement as defined in claim 5 wherein said index spring overlies the handle extension and is normally biased into contact with said supporting frame along a peripheral undersurface thereof.

7. The improvement as defined in claim 6 wherein said index spring includes an upwardly extending spring release latch surrounding said supporting frame for releasably disengaging the index spring from contact with the peripheral undersurface of said supporting frame.

8. In a compound miter saw, a supporting frame, a turntable selectively rotatably mounted on said supporting frame, a power driven saw blade pivotally mounted on said turntable along a predetermined path relative to said turntable, and said turntable having saw blade slot means for receiving the saw blade therein, the improvement comprising:

a work supporting fence having a bottom surface mounted upon said supporting frame and including a pair of work engaging surfaces longitudinally aligned across the saw blade slot means, said work supporting fence having first angularly offset surfaces on each side of said saw blade slot means which are aligned in generally parallel relationship with second angularly offset surfaces provided in said supporting frame, and clamping means for clamping the first angularly offset surfaces of said work supporting fence relative to the second angularly offset surfaces of said supporting frame.

9. The improvement as defined in claim 8 wherein said supporting frame further is provided with threaded openings in said second angularly offset surfaces which are aligned with passageways provided in said first angularly offset surfaces, and a pair of threaded clamp bolts extending through said passageways of said first angularly offset surfaces and threadably received within the threaded openings of said second angularly offset surfaces, each of said clamp bolts having a clamping surface for engaging and clamping said work supporting fence between the first angularly offset surfaces of said work supporting fence and the second angularly offset surfaces of said supporting frame as said clamp bolts are threaded into the threaded openings of aid second angularly offset surfaces.

10. The improvement as defined in claim 9 wherein the passageways provided in said first angularly offset surfaces are longitudinally elongated passageways enabling longitudinal adjustment of said work supporting fence.

11. The improvement as defined in claim 10 wherein said supporting frame is provided with corresponding front and rear threaded openings on each side of said saw blade slot means for positioning said work supporting fence in front and rear work engaging positions.

12. The improvement as defined in claim 11 wherein the front engaging position is located at the center of the turntable.

13. The improvement as defined in claim 12 wherein the rear engaging position is laterally offset from the center of the turntable, and means are provided to permit side-by-side sliding movement of said work supporting fence relative to said supporting frame during miter adjustment and positioning of said saw blade relative to said supporting frame.

14. The improvement as defined in claim 13 wherein the first and second angularly offset surfaces are each 30°

offset from the bottom surface of the work supporting fence.

15. In a compound miter saw pivotally mounted on a supporting frame between an operational position, when lowered, and a rest position, when raised, and having a motor driven saw blade rotatably mounted on a shaft, a housing partially encasing the saw blade, and a swinging blade guard arranged to cover an exposed area of the saw blade when in its rest position, the improvement comprising:

said swinging blade guard having a pivot center on said housing which is eccentrically offset upwards from the saw blade shaft and backwards toward the pivotal mounting of said compound miter saw, the eccentrically offset pivot center of said swinging blade guard being located on a detachable mounting plate that also pivots on said housing on a second eccentrically offset pivot center when detached at one end from said housing, to facilitate access to the saw blade shaft without substracting from workpiece capacity when the compound miter saw is used in miter or bevel operations.

16. The improvement as defined in claim 15 wherein said swinging blade guard includes an actuator arm which is eccentrically offset from the pivot center of the swinging blade guard.

17. The improvement as defined in claim 16 wherein said actuator arm includes an elongated slot extending from one end thereof for operative engagement with the eccentrically offset pivot center of the swinging blade guard.

18. The improvement as defined in claim 17 wherein said actuator arm is mounted at its other end to said supporting frame.

19. The improvement as defined in claim 18 wherein coil spring means are provided between said swinging blade guard and said detachable mounting plate for normally resiliently biasing said swinging blade guard to cover said exposed area of the saw blade when in its at rest position.

20. In a compound miter saw, a supporting frame, a turntable selectively rotatably mounted on said supporting frame for selective miter adjustment, a saw blade being pivotally mounted on said turntable for movement between an operational position, when lowered, and an at rest position, when raised, said saw blade also being pivotally mounted on said turntable for bevel pivot adjustment in a direction generally transverse to the pivotal movement of said saw blade between operational and at rest positions, the improvement comprising:

first and second closed cylinders extending transversely relative to one another and having transversely extending axes, said first and second transversely extending closed cylinders being positioned between said supporting frame and said saw blade, the first closed cylinder including means for the pivot movement of said saw blade between operational and at rest positions, and said second closed cylinder including means for the bevel pivot adjustment of said saw blade relative to said turntable.

21. The improvement as defined in claim 20 wherein said first and second transversely extending closed cylinders such include fixed and moving cylinder sections enabling said aforementioned movements.

22. The improvement as defined in claim 21 wherein said first and second transversely extending closed cylinders are integrally joined and fixed to one another across one of the fixed and moving cylinder sections thereof.

23. The improvement as defined in claim 22 wherein the fixed cylinder section of the first closed cylinder, during the pivotal movement of said saw between operational and at rest positions, is integrally joined to the moving cylinder section of the second closed cylinder for movement therewith during the bevel pivot adjustment of said saw relative to said turntable.

24. A compound miter saw comprising:

a supporting frame, a turntable selectively rotatably mounted on said supporting frame and including a handle and index spring assembly for selectively rotatably positioning said turntable relative to said supporting frame, a power driven saw blade pivotally mounted on said turntable along a predetermined path relative to said turntable, said turntable having saw blade slot means for receiving the saw blade therein, a work supporting fence mounted on said supporting frame and including a pair of work engaging surfaces longitudinally aligned across the saw blade slot means, said supporting frame including a depending arm extending through said saw blade slot means and being received within an elongated opening in said index spring, to enable said turntable and said saw blade slot means to be positioned relative to said power driven saw blade, while said work supporting fence is maintained in alignment relative to said saw blade slot means as the depending arm of said work supporting fence moves within the elongated opening of said index spring, said saw blade slot means in said turntable including an elongated slot for receiving said saw blade and a corresponding opening connected to said elongated slot and underlying said work supporting fence, and said work supporting fence having a complementary opening generally vertically aligned with the opening of the saw blade slot means in said turn table.

25. A compound miter saw comprising:

a supporting frame, a turntable selectively rotatably mounted on said supporting frame, a power driven saw blade pivotally mounted on said turntable along a predetermined path relative to said turntable, and said turntable having saw blade slot means for receiving the saw blade therein, a work supporting fence having a bottom surface mounted upon said supporting frame and including a pair of work engaging surfaces longitudinally aligned across the saw blade slot means, said work supporting fence having first angularly offset surfaces on each side of said saw blade slot means which are aligned in generally parallel relationship with second angularly offset surfaces provided in said supporting frame, said work supporting fence further being provided with threaded openings in said second angularly offset surfaces which are aligned with passageways provided in said first angularly offset surfaces, and a pair of threaded clamp bolts extending through said passageways of said first angularly offset surfaces and threadably received within the threaded openings of said second angularly offset surfaces, each of said clamp bolts having a clamping surface for engaging and clamping said work supporting fence between the first angularly offset surfaces of said work supporting fence and the second angularly offset surfaces of said supporting frame as said clamp bolts are threaded into the threaded openings of said second angularly offset surfaces.

26. A compound miter saw comprising:

a supporting frame, a turntable selectively rotatably mounted on said supporting frame and including a handle and index spring assembly for selectively rotatably positioning said turntable relative to said supporting frame, a power driven saw blade pivotally mounted on said turntable along a predetermined path relative to said turntable, said turntable having saw blade slot means for receiving the saw therein, a work supporting fence mounted on said supporting frame and including a pair of work engaging surfaces longitudinally aligned across the saw blade slot means, said work supporting fence including a depending arm extending through said saw blade slot means and being received within an elongated opening in said index spring, and said work supporting fence having first angularly offset surfaces on each side of said saw blade slot means which are aligned in generally parallel relationship with second angularly offset surfaces provided in said supporting frame, and clamping means for clamping the first angularly offset surfaces of said work supporting fence relative to the second angularly offset surfaces of said supporting frame.

27. A compound miter saw, said saw being pivotally mounted on a supporting frame between an operational position, when lowered, and a rest position, when raised, said pivotally mounted saw including a motor driven saw blade rotatably mounted on a shaft, a housing partially encasing the saw blade, a swinging blade guard arranged to cover an exposed area of the saw blade when in its rest position, said swinging blade guard having a pivot center on said housing which is eccentrically offset upwards from the saw blade shaft and backwards toward the pivotal mounting of said compound miter saw, the eccentrically offset pivot center of said swinging blade guard being located on a detachable mounting plate that also pivots on said housing on a second eccentrically offset pivot center when detached at one end from said housing, and said swinging blade guard including an actuator arm which is eccentrically offset from the pivot center of the swinging blade guard, whereby to facilitate access to the saw blade shaft.

28. A compound miter saw comprising:

a supporting frame, a turntable selectively rotatably mounted on said supporting frame for selective miter adjustment, a saw blade being pivotally mounted on said turntable for movement between an operational position when lowered, and an at rest position, when raised, said saw blade also being pivotally mounted on said turntable for bevel pivot adjustment in a direction generally transverse to the pivotal movement of said saw blade between operational and at rest positions, first and second closed cylinders extending transversely relative to one another and having transversely extending axes, said first and second transversely extending closed cylinders being positioned between said supporting frame and said saw blade, the first closed cylinder including fixed and movable cylinder sections for pivotal movement of said saw blade between operational and at rest positions, and said second closed cylinder including fixed and movable cylinder sections for bevel pivot adjustment of said saw blade relative to said turntable, and said first and second transversely extending closed cylinder sections being integrally joined and fixed to one another across one of the fixed and movable cylinder sections between said first and second transversely extending closed cylinders.