Rip fence with dual locking mechanism

• US 6,460,442 B2
• Filed: 02/28/2002
• Issued: 10/08/2002
• Est. Priority Date: 06/09/1999
• Status: Expired due to Term

• Current Assignee: Credo Technology Corporation
• Original Assignee: S-B Power Tool Company (Robert Bosch GmbH)
• Inventors: Talesky, Mark S., Svetlik, Kenneth N., Romo, Ezequiel
• Primary Examiner(s): Shoap, Allan N.
• Assistant Examiner(s): Choi, Stephen
• Application Number:
  US10/087,479
• Publication Number:
  US 20020088325A1
• Time in Patent Office: 222 Days
• Field of Search: 834/38, 834/44, 834/46, 835/221.9, 834/772, 834/667, 834/671, 269/318, 144/287
• US Class Current: 83/438
• CPC Class Codes: B27B 27/02 arranged laterally and parallel with respect to the plane of the saw blade
• CPC Class Codes: Y10T 83/727 With means to guide moving work
• CPC Class Codes: Y10T 83/739 Positively confines or otherwise determines path of work
• CPC Class Codes: Y10T 83/7593 Work-stop abutment
• CPC Class Codes: Y10T 83/7647 Adjustable
• CPC Class Codes: Y10T 83/773 Work-support includes passageway for tool [e.g., slotted table]
• CPC Class Codes: Y10T 83/858 Indicates dimension of work being cut

Abstract

A rip fence used with a table saw, where the table saw has an upper cutting surface with a front edge surface and a rear edge surface. The rip fence includes a main casing having a front clamping mechanism at the front end and a rear clamping mechanism at the rear end. The front clamping mechanisms has a frame with a handle pivotally connected thereto. A link is connected at one end to the handle and at another end to a cam. An activation plate is also connected the cam and to a clamping plate. The handle rotates between a locked position and a released position thereby moving the link to rotate the cam against the activation plate. The activation plate causes the clamping plate to laterally move between a locked position and a released position relative the front edge surface. The handle also causes the rear clamping mechanism to move between a locked and a released position relative the rear edge surface.

Claims

1. A table saw comprising:

a frame having an upper cutting surface, the upper cutting surface having an opening for a blade to extend through and having a front edge surface and a rear edge surface;

a rail connected to the front edge surface, the rail having a slot extending longitudinally along an upper surface of the rail, and

a rip fence slideably engaged to the table saw between various secured positions such that the rip fence is generally parallel to the blade, the rip fence comprising;

an elongated casing extending between a front end proximate the front edge surface and a rear end proximate the rear edge surface;

a handle having an upper edge wherein one end of the upper edge pivots relative the front end of the casing at one end of the upper edge;

a rotatable cam having a first end and a second end;

a movable link pivotally connected at one end to the first end of the cam and an opposing end pivotally connected at an opposing end of the upper edge of the handle;

a first activation plate having an upper end and a lower end, with the lower end engaged towards the second end of the cam;

a clamping plate having a passage formed towards one end and a lip extending from an opposing end, wherein a second end of the first activation plate extending through the passage and the lip being slideably positioned within the rail slot;

an elongated rod movably supported by the casing wherein one end of a rod engages the upper end of the first activation plate;

a second activation plate movably engaged at an upper end to a second end of the rod and wherein the second activation plate has a tab at a lower end, and

wherein the handle is movable between a lower locked position such that the link pushes the cam against the upper end of the first activation plate thereby pushing the lip of the clamping plate in a secured position against the rail slot and the first activation plate pushes the rod against the second activation plate so that the tab is in a secured position relative the table saw and an upper released position such that the link pulls the cam away from the upper end of the first activation plate thereby pulling the lip into a released position within the rail slot and the cam pulls the rod away from the second activation plate so that the tab is in a released position relative the table saw.

2. The table saw according to claim 1 wherein the rip fence further comprises glide blocks slidably engaged within the rail slot.

3. The table saw according to claim 1 further comprising a rear rail connected to a rear edge surface of the upper cutting surface wherein the rear rail having a longitudinal extending groove and wherein the tab is movably engaged between a secured position within the groove and a released position away from the groove.

4. A rip fence for use with a table saw, the table saw having an upper cutting surface with a blade extending through an opening therein and having a front and rear edge surface, the rip fence comprising:

a frame portion;

a handle movable between a locked position and a release position, the handle having an inner surface along an upper edge, wherein the handle is pivotally connected to the frame portion to move between the locked and the released positions;

a link movably connected at an upper end to the handle;

a cam connected at a first end to a lower end of the link;

a front activation plate having a first end and an opposing end, wherein the first end is connected to a second end of the cam such that the link, the cam, and the first end of the front activation plate are contained by the frame; and

a front clamping plate, having a passage formed towards one end and a lip extending from an opposing end, the front activation plate engaging the passage such that the lip from the opposing end is movably engaged relative the front edge surface of the table saw between a locked position wherein the clamping plate secures the rip fence in a position parallel to the blade and a released position wherein the clamping plate permits the rip fence to slide relative the upper surface and wherein the movement of the handle between the locked and open position moves the link, the cam and the front activation plate to move the front clamping plate between the locked and released positions.

5. The rip fence according to claim 4 further comprising an elongated casing having a front end and a rear end, the frame portion being connected to the front end of the elongated casing.

6. The rip fence according to claim 4 wherein the frame further comprising a glide portion that slideably moves relative the front edge surface of the table saw.

7. The rip fence according to claim 4 further comprising a rear activation plate movable between a locked position when the handle is in the locked position and a released position when the handle is in the open position, the rear activation plate having a tab at the lower end thereof movable relative the rear edge surface thereby securing the rip fence in a position parallel to the blade when the handle is in the locked position.

8. The rip fence according to claim 7 further comprising a rod connected between the front activation plate and the rear activation plate to move the rear activation between the locked position and the released position.

9. The rip fence according to claim 7 wherein the tab fits in a groove formed in the rear edge surface of the table saw.