Mobile base for a table saw

• US 8,246,059 B2
• Filed: 02/27/2009
• Issued: 08/21/2012
• Est. Priority Date: 02/29/2008
• Status: Active Grant

• Current Assignee: Sawstop Holding LLC
• Original Assignee: SD3, LLC
• Inventors: Gass, Stephen F., Wright, James F. W.
• Primary Examiner(s): Olszewski, John R
• Assistant Examiner(s): FOLLMAN, BRODIE J
• Application Number:
  US12/380,407
• Publication Number:
  US 20090224133A1
• Time in Patent Office: 1,271 Days
• Field of Search: 280/6.15, 280/35, 280/43.12, 280/43.13, 280/43.14, 280/43.17, 280/43.24, 280/6.151, 280/6.153, 280/6.154, 280/6.155, 280/638, 108/20, 108/21, 108/22, 108/144.11, 108/145, 108/147, 108/147.22, 312/27, 312/28, 312/30, 312/312, 312/319.1, 312/319.5, 312/319.6, 312/319.7, 312/319.9, 312/325, 414/458, 414/459, 414/540, 414/546, 248/651, 248/669, 269/17, 254/2.B, 254/DIG.1, 254/93.H, 254/93.R
• US Class Current: 280/43.14
• CPC Class Codes: F16M 3/00 Portable or wheeled frames or beds, e.g. for emergency power-supply aggregates, compressor sets construction of vehicles in general B60 - B62

Abstract

A mobile base that supports a cabinet saw is disclosed. The mobile base includes casters that support the saw when a foot pedal is depressed. The mobile base raises the saw asymmetrically to provide clearance for the legs of an extension table attached to the table of the saw. A hydraulic jack is employed to raise the saw and hold it raised while the saw is moved, and a foot-operated release lever attached to the jack lowers the saw back to the ground at an adjustable rate of descent.

Claims

1. A mobile base for use with a power tool, the mobile base comprising:

a support frame;

a plurality of wheels supported by the support frame;

a lifting frame supported by the support frame, where the lifting frame includes a rail having a support portion configured to extend under and contact the power tool to support the power tool, and where the rail has an end portion; and

a jack supported by the support frame and configured to move the lifting frame relative to the support frame to raise the power tool, where the jack includes a piston adapted to extend and retract to move the lifting frame relative to the support frame, and where the jack is positioned so that extension of the piston pushes the end portion of the rail to move the lifting frame.

2. The mobile base of claim 1, where the support frame has a generally rectangular shape with sides, and further comprising a foot pedal to extend the piston and move the lifting frame, where the foot pedal is positioned to a side of the support frame.

3. The mobile base of claim 2, further comprising a foot-operable release lever to allow the piston to retract, where the foot-operable release lever is positioned to a side of the support frame.

10. The mobile base of claim 1 where the jack is a hydraulic jack.

11. The mobile base of claim 1 where the speed the piston can retract is adjustable.

12. The mobile base of claim 1 where the lifting frame has a generally rectangular shape with first and second sides, where the jack is positioned near one of the sides, and where the lifting frame is configured so that movement of the piston moves both the first and second sides of the lifting frame.

13. The mobile base of claim 10, where the support frame has a generally rectangular shape with sides, and further comprising a foot pedal to pump the jack, where the foot pedal is positioned to a side of the support frame.

14. The mobile base of claim 10, where the support frame has a generally rectangular shape with sides, and further comprising a foot-operable release lever to allow the piston to retract, where the foot-operable release is positioned to a side of the support frame.

15. The mobile base of claim 10, where the support frame has a generally rectangular shape with sides, and further comprising a foot pedal to pump the jack to extend the piston and a release valve that opens to allow the piston to retract, where the release valve is configured to be opened by a foot-operable lever, and where the foot pedal and foot-operable lever are positioned to a side of the support frame.

16. The mobile base of claim 12 where the end portion of the rail is outside of the generally rectangular shape of the lifting frame and adjacent one of the first or second sides.

17. The mobile base of claim 1, where the jack is positioned so that when the rail supports a power tool, the jack is beside the portion of the power tool supported by the rail.

18. The mobile base of claim 1, where the mobile base is generally rectangular with four corners and a front, and where the jack is positioned adjacent a front corner.

4. A mobile base for use with a power tool, the mobile base comprising:

a support frame;

a plurality of wheels supported by the support frame;

a lifting frame supported by the support frame and configured to support the power tool; and

a jack supported by the support frame and configured to move the lifting frame relative to the support frame to raise the power tool;

where the. support frame includes first and second sides, and where the lifting frame is configured so that movement of the lifting frame by the jack causes at least one of the first and second sides to rise asymmetrically from the other of the first and second sides.

5. A mobile base for use with a power tool, the mobile base comprising:

a support frame;

a plurality of wheels supported by the support frame;

a lifting frame supported by the support frame, where the lifting frame includes a rail having a support portion configured to extend under the power tool to support the power tool and having an end portion; and

a jack supported by the support frame and configured to move the lifting frame relative to the support frame to raise the power tool, where the jack includes a piston adapted to extend and retract to move the lifting frame relative to the support frame, and where the jack is positioned so that extension of the piston pushes the end portion of the rail to move the lifting frame;

where the lifting frame includes a substantially L-shaped piece pivotally connected to the rail, and where the L-shaped piece includes sections that create the L-shape and that do not pivot with respect to each other.

6. The mobile base of claim 5 where the L-shaped piece is also pivotally connected to the support frame.

7. The mobile base of claim 6 further comprising:

a second rail configured to extend under the power tool to support the power tool; and

a second L-shaped piece including sections that create the L-shape and that do not pivot with respect to each other, where the second L-shaped piece is pivotally connected to the second rail and pivotally connected to the support frame.

8. The mobile base of claim 7 where the L-shaped pieces are linked so that movement of one L-shaped piece causes movement of the other L-shaped piece.

9. A mobile base for use with a power tool, the mobile base comprising:

a support frame;

a plurality of wheels supported by the support frame;

a lifting frame supported by the support frame and configured to support the power tool; and

a jack supported by the support frame and configured to move the lifting frame relative to the support frame to raise the power tool;

where the lifting frame includes a rail having a generally flat span configured to extend under the power tool to support the power tool, where the lifting frame has a lowered position and a raised position, where the span rests against the ground when the lifting frame supports the power tool in the lowered position, and where the wheels support the mobile base when the lifting frame supports the power tool in the raised position.