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Automatic braking system for pivoting power tool and method of operation thereof

A technology of automatic braking and electric tools, applied in the direction of manufacturing tools, wood processing equipment, metal processing equipment, etc., can solve the problems of additional damage, destructiveness, tool danger, etc.

Active Publication Date: 2018-03-09
ROBERT BOSCH GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In all of these systems, however, the short stopping times of the saw blade create a large angular momentum that will swing the head up or down with great force (depending on the miter saw's blade or motor rotation direction), which is destructive to the structure of the tool
In addition to posing a hazard to the tool, high angular momentum forces pose an additional risk of injury to the user

Method used

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  • Automatic braking system for pivoting power tool and method of operation thereof
  • Automatic braking system for pivoting power tool and method of operation thereof
  • Automatic braking system for pivoting power tool and method of operation thereof

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Embodiment Construction

[0012] For the purpose of promoting an understanding of the principles of the disclosure, reference will now be made to the embodiments illustrated in the drawings and described in the written description that follow. It should be understood that no limitation of the scope of the disclosure is thereby intended. It is also to be understood that the disclosure includes any alterations and modifications to the illustrated embodiments, and includes further applications of the principles of the disclosure, as would normally be recognized by one skilled in the art to which the disclosure pertains.

[0013] now refer to figure 1 , shows a miter saw assembly 100 . Miter saw assembly 100 includes a base 102 and a turntable 104 that is rotatable on base 102 . The miter saw assembly 100 also includes a cutting head 106 mounted on a cutting head support assembly 108 . Cutting head 106 (which may also be referred to herein as a “cutting assembly”) includes a motor 110 operable to rotate...

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Abstract

An automatic braking system for a pivoting power tool includes a cutting assembly, a cutting arm supporting the cutting assembly, a hinge supporting the cutting arm through a pivot, a primary braking system operably connected to the cutting assembly, a secondary braking system operably connected to the hinge, and a safety circuit configured to sense an unsafe condition and, in response to sensing the unsafe condition, (i) control the primary braking system to oppose rotation of a blade supported by the cutting assembly, and (ii) control the secondary braking system to oppose rotation of the cutting arm.

Description

[0001] This application claims the benefit of US Provisional Application No. 61 / 781,931, filed March 14, 2013, which is hereby incorporated by reference in its entirety. technical field [0002] The present disclosure relates to machines, such as miter saws, that include a guard system configured to quickly stop the rotational motion of a shaping device. Background technique [0003] Several power tools have been produced to facilitate forming workpieces into desired shapes. One such power tool is a miter saw. Miter saws present safety concerns because the blades of miter saws are often very sharp and move at a high rate. As a result, serious injuries, such as badly wounded fingers and deep cuts, can occur almost instantaneously. A number of different safety systems have been developed for miter saws to address the inherent hazards of exposed saw blades moving at high speeds. One such safety system is a saw blade guard. The blade guard movably encloses the blade, thereby...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23D47/00B27B5/29B27G19/02
CPCB23D59/001B27B5/38Y10T83/04Y10T83/089
Inventor G·冯P·扎亚拉曼
Owner ROBERT BOSCH GMBH