Brake positioning system

• US 7,228,772 B2
• Filed: 02/18/2005
• Issued: 06/12/2007
• Est. Priority Date: 08/14/2000
• Status: Expired due to Term

• Current Assignee: Sawstop Holding LLC
• Original Assignee: SD3, LLC
• Inventors: Gass, Stephen F.
• Primary Examiner(s): PETERSON, KENNETH E
• Assistant Examiner(s): PETERSON, KENNETH E
• Application Number:
  US11/061,162
• Publication Number:
  US 20050139051A1
• Time in Patent Office: 844 Days
• Field of Search: 83/621, 83/72, 834/713, 834/771, 834/772, 834/73, 834/88, 834/90, 835/81, 83D/IG.1, 83/58, 83/62, 83/767, 834/712, 834/78, 834/81, 834/85, 834/87, 834/89, 835/74, 838/21, 838/23, 83827-829, 836/65, 836/66, 839/54, 835/221.2, 83/56, 188/31, 188/82.7, 192/129.R, 125/13.01, 241/37.5, 408 4- 8, 408/18, 408/48, 409/64, 409/207, 409/218, 409/288, 303/88, 303/73, 303/71, 303/70, 303/80, 303/81, 303/90, 303/92, 144/382, 144/356, 144/154.5, 144/363, 144/365, 144/384, 144/391, 144/420, 144/426, 144/427, 144/20, 144/117.1, 144/128, 144/123, 144/209.1, 144/216, 144/251.1, 144/362, 144/2.1, 451/1, 451/6, 451/9, 451/451, 451/119, 451/158, 451/177, 451/259, 451/299, 56/102.R, 56/174, 561/22, 561/31, 561/53, 561/54, 562/35, 562/44, 562/90, 56/113, 56/104, 56D/IG.15, 318/362, 318/364, 318/372, 318/445, 307/39, 361/143
• US Class Current: 83/62.1
• CPC Class Codes: B23D 47/08 of devices for bringing the circular saw blade to the workpiece or removing same therefrom
• CPC Class Codes: B23D 59/001 Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade measuring in general G01; controlling in general G05
• CPC Class Codes: B27B 13/14 Braking devices specially designed for band sawing machines, e.g. acting after damage of the band saw blade
• CPC Class Codes: B27B 5/38 Devices for braking the circular saw blade or the saw spindle; Devices for damping vibrations of the circular saw blade, e.g. silencing B23D47/005 takes precedence
• CPC Class Codes: B27G 19/00 Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
• CPC Class Codes: B27G 19/02 for circular saws
• CPC Class Codes: F16P 3/12 with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine F16P3/08 takes precedence
• CPC Class Codes: F16P 3/145 using magnetic technology
• CPC Class Codes: F16P 3/147 using electro-magnetic technology, e.g. tags or radar
• CPC Class Codes: F16P 3/148 using capacitive technology
• CPC Class Codes: Y10S 83/01 Safety devices
• CPC Class Codes: Y10T 83/081 With randomly actuated stopping means
• CPC Class Codes: Y10T 83/089 Responsive to tool characteristic
• CPC Class Codes: Y10T 83/141 With means to monitor and control operation [e.g., self-regulating means]
• CPC Class Codes: Y10T 83/613 Work guard
• CPC Class Codes: Y10T 83/7697 Tool angularly adjustable relative to work-support
• CPC Class Codes: Y10T 83/7705 Adjustable angular relationship
• CPC Class Codes: Y10T 83/7726 By movement of the tool
• CPC Class Codes: Y10T 83/773 Work-support includes passageway for tool [e.g., slotted table]
• CPC Class Codes: Y10T 83/778 And means to rotate tool
• CPC Class Codes: Y10T 83/7788 : Tool carrier oscillated or rotated
• CPC Class Codes: Y10T 83/8773 : Bevel or miter cut

Abstract

A saw is disclosed having a detection system adapted to detect a dangerous condition between a person and a saw blade, and a brake adapted to stop the saw blade in response to detection of the dangerous condition. The saw further includes a brake positioning system that allows the brake to be positioned in at least two different operable positions to accommodate at least two different blade diameters. The saw may include a system to detect brake-to-blade spacing.

Claims

1. A woodworking machine comprising:

a blade selected from a range of operable sizes;

a detection system adapted to detect a dangerous condition between a person and the blade;

a brake adapted to decelerate the blade in response to detection of the dangerous condition; and

a brake positioning system configured to allow the brake to be selectively positioned in at least two different operable positions to accommodate at least two different blade sizes;

where the brake positioning system is configured to prevent the brake from being positioned in an operable position that does not correspond to the size of the blade.