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Automatic magnetic brake for band saws

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Publication number
US2661780A
US2661780A US17720350A US2661780A US 2661780 A US2661780 A US 2661780A US 17720350 A US17720350 A US 17720350A US 2661780 A US2661780 A US 2661780A
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US
Grant status
Grant
Patent type
Prior art keywords
saw
switch
arm
spring
blade
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
Inventor
Joseph P Morgan
Original Assignee
Harry Crisci
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27BSAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B13/00Band or strap sawing machines; Components or equipment therefor
    • B27B13/14Braking devices specially designed for band sawing machines, e.g. acting after damage of the band saw blade
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/081With randomly actuated stopping means
    • Y10T83/088Responsive to tool detector or work-feed-means detector
    • Y10T83/089Responsive to tool characteristic
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00Cutting
    • Y10T83/707By endless band or chain knife
    • Y10T83/7226With means to guard the tension

Description

Dec. 8, 1953 J. P. MORGAN AUTOMATIC MAGNETIC BRAKE FOR BAND SAWS Filed Aug. 2, 1950 Joseph R Morgan BY Q4, WW

I N V EN TOR.

' Atlomrjs Patented Dec. 8, 1953 AUTOMATIC MAGNETIC BRAKE For: BAND sAws Joseph P. Morgan, Wampum,

Pa.,' assignor of forty-nine per cent to Harry CriscLNew Castle, Pa.

Application August 2, 1950, Serial N 0. 177,203

2 Claims.

The present invention relates to new and useful improvements in safety means for band saws and more particularly to an improved automatically operated emergency safety mechanism to halt further travel of the band saw should the same become broken.

More specifically the invention comprises a normally de-energized electro magnet controlled by an electric switch which is actuated when the same saw breaks to energize the magnet and to which the broken blade of the saw is attracted for holding the saw from further movement until the power for operating the saw machine is cut off. An important object of the invention is to provide automatic switch means for the electro magnet which is held in open position by an unbroken band saw and providing spring means for closing the switch when the saw blade breaks.

A further object is to provide a device of this character of simple and practical construction, which is efiicient and reliable in operation, relatively inexpensive to manufacture and install in operative position on the saw machine and which is otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a fragmentary side elevational view of a saw machine with parts broken away and shown in section to show the electro magnet and switch mounted in position thereon;

Figure 2 is an enlarged sectional view of the switch taken on a line 2--2 of Figure l; and

Figure 3 is an enlarged front elevational view of the magnet.

Referring now to the drawing in detail wherein for the purpose of illustration I have disclosed a preferred embodiment of the invention, the numeral 5 designates the guard or housing of a conventional type of band saw machine provided with the usual vertically travelling endless saw blade 6 which passes through the table I.

A switch housing 8 is secured to the underside of the table behind the front flight 9 of the saw blade, the housing enclosing a switch designated generally at I!) and which includes a pair of stationary contacts I I and I2 suitably insulated from the switch housing and a sliding switch arm I3 positioned between the stationary contacts with one end of the arm projecting outwardly of the housing and formed with a yoke I4 in which a roller I5 is journalled. A coil spring I6 is positioned in the switch housing at the rear end of switch arm l3 and engages a flange or cross pin I 1 fixed to the arm I3 to urge the latter outwardly.

A movable contact designated generally at I8 is suitably secured to the switch arm I3 and includes a pair of oppositely extending arms I9 and 20 positioned for engaging the contacts II and I2 upon an outward movement of the switch arm [3 by spring I6. The movable contact I8 is preferably adjustable on the switch arm it for adjusting the contact arms I9 and 20 relative to the contacts II and I2.

An electric circuit 2| connects the contacts II and i2 with a suitable source of current (not shown) and with an electromagnet 22 of a conventional type secured to the rear of the guard 5 in a position spaced from the rear flight 23 of the saw blade 6. In the operation of the device the spring I6 urges sliding switch arm l3 outwardly of the switch housing 8 to hold the roller I5 against the front flight 9 of the saw blade 6, the 25 spring being held under tension by the saw blade and the saw blade limiting outward movement of the switch arm I3 to hold the movable contact arms I9 and 20 spaced from the stationary contacts I I and I2, as shown in Figure 2 of the drawmgs.

The breakage of the saw blade usually occurs adjacent the table I and immediately upon such breakage spring I6 will slide switch arm I3 forwardly to close the circuit by bridging the stationary contacts I I and I2 by the contact arms I9 and 20 to thus energize the magnet 22 which thus attracts the rear flight 23 of the saw blade to hold the latter and halt its further. movement until the operator cuts off the machine and replaces the saw.

In view of the foregoing description taken in conjunction with the accompanying drawings it is believed that a clear understanding of the device will be quite apparent to those skilled in this art. A more detailed description is accordingly deemed unnecessary.

It is to be understood, however, that even though there is herein shown and described a preferred embodiment of the invention the same is susceptible to certain changes fully comprehended by the spirit of the invention as herein described and the scope of the appended claims.

Having described the invention, what claimed as new is:

1. In combination with a band saw, a switch including a slidable switch arm, spring means tending to close the switch, said arm being held in open position against and by the saw and against the urging of the spring and closed by the spring upon a break in the saw, and an electrically energized magnet connected to and controlled by the switch, said magnet being positioned adjacent the saw to attract and hold the latter stationary by the closing of the switch.

2. In combination with a band saw, a switch including a slidable switch arm, a roller at one end of the arm bearing against a travelling saw, spring means projecting the arm and holding the roller against the saw, a contact carried by the arm, a stationary contact in the path of movement of the first named contact and held spaced 4 therefrom by the saw, and an electro-magnet supported adjacent the saw and connected in a circuit with said contacts to energize the magnet and to attract and hold the saw stationary upon a break in the saw to release the switch arm and close the contacts.

JOSEPH P. MORGAN.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,927,203 De Groote Sept. 19, 1933 2,286,589 Tannewitz June 16, 1942 2,395,905 Oet'zel Mar. 5, 1946

US2661780A 1950-08-02 1950-08-02 Automatic magnetic brake for band saws Expired - Lifetime US2661780A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US2661780A US2661780A (en) 1950-08-02 1950-08-02 Automatic magnetic brake for band saws

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US2661780A US2661780A (en) 1950-08-02 1950-08-02 Automatic magnetic brake for band saws

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US2661780A true US2661780A (en) 1953-12-08

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US2661780A Expired - Lifetime US2661780A (en) 1950-08-02 1950-08-02 Automatic magnetic brake for band saws

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Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2783593A (en) * 1954-05-28 1957-03-05 Lad L Hercik Control mechanism for grinding belt
US3485326A (en) * 1967-10-20 1969-12-23 Mcculloch Corp Magnetic stopping device
FR2352621A1 (en) * 1976-05-25 1977-12-23 Yoneda Kichi Safety device for emergency stop of a tape edge of a cutting apparatus
DE3522585A1 (en) * 1984-06-25 1986-01-02 Amada Co Ltd bandsaw machine
US20020017182A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Brake positioning system
US20020017179A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Miter saw with improved safety system
US20020017183A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Cutting tool safety system
US20030015253A1 (en) * 2001-07-18 2003-01-23 Gass Stephen F. Router with improved safety system
US20030019341A1 (en) * 2001-07-27 2003-01-30 Gass Stephen F. Safety systems for band saws
US6813983B2 (en) 2000-09-29 2004-11-09 Sd3, Llc Power saw with improved safety system
US6826988B2 (en) 2000-09-29 2004-12-07 Sd3, Llc Miter saw with improved safety system
US6945148B2 (en) 2000-09-29 2005-09-20 Sd3, Llc Miter saw with improved safety system
US6957601B2 (en) 2000-08-14 2005-10-25 Sd3, Llc Translation stop for use in power equipment
US6994004B2 (en) 2000-09-29 2006-02-07 Sd3, Llc Table saw with improved safety system
US7055417B1 (en) 1999-10-01 2006-06-06 Sd3, Llc Safety system for power equipment
US7077039B2 (en) 2001-11-13 2006-07-18 Sd3, Llc Detection system for power equipment
US7197969B2 (en) 2001-09-24 2007-04-03 Sd3, Llc Logic control with test mode for fast-acting safety system
US7231856B2 (en) 2001-06-13 2007-06-19 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US7377199B2 (en) 2000-09-29 2008-05-27 Sd3, Llc Contact detection system for power equipment
US7481140B2 (en) 2005-04-15 2009-01-27 Sd3, Llc Detection systems for power equipment
US7509899B2 (en) 2000-08-14 2009-03-31 Sd3, Llc Retraction system for use in power equipment
US7610836B2 (en) 2000-08-14 2009-11-03 Sd3, Llc Replaceable brake mechanism for power equipment
US7681479B2 (en) 2000-08-14 2010-03-23 Sd3, Llc Motion detecting system for use in a safety system for power equipment
US7707920B2 (en) 2003-12-31 2010-05-04 Sd3, Llc Table saws with safety systems
US7712403B2 (en) 2001-07-03 2010-05-11 Sd3, Llc Actuators for use in fast-acting safety systems
US7784507B2 (en) 2000-09-29 2010-08-31 Sd3, Llc Router with improved safety system
US7788999B2 (en) 1999-10-01 2010-09-07 Sd3, Llc Brake mechanism for power equipment
US7827890B2 (en) 2004-01-29 2010-11-09 Sd3, Llc Table saws with safety systems and systems to mount and index attachments
US7836804B2 (en) 2003-08-20 2010-11-23 Sd3, Llc Woodworking machines with overmolded arbors
US7895927B2 (en) 1999-10-01 2011-03-01 Sd3, Llc Power equipment with detection and reaction systems
US7921754B2 (en) 2000-08-14 2011-04-12 Sd3, Llc Logic control for fast-acting safety system
US7991503B2 (en) 2003-12-31 2011-08-02 Sd3, Llc Detection systems for power equipment
US8061245B2 (en) 2000-09-29 2011-11-22 Sd3, Llc Safety methods for use in power equipment
US8065943B2 (en) 2000-09-18 2011-11-29 Sd3, Llc Translation stop for use in power equipment
US8459157B2 (en) 2003-12-31 2013-06-11 Sd3, Llc Brake cartridges and mounting systems for brake cartridges
WO2017040585A1 (en) * 2015-09-01 2017-03-09 Jpw Industries Inc. Power tool with digital variable reluctance motor control
US9724840B2 (en) 1999-10-01 2017-08-08 Sd3, Llc Safety systems for power equipment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1927203A (en) * 1932-12-02 1933-09-19 Tannewitz Works Brake device for band saws
US2286589A (en) * 1940-10-28 1942-06-16 Carl E Tannewitz Blade grabber for band saws
US2395905A (en) * 1944-04-15 1946-03-05 Warner Electri Brake Mfg Compa Electromagnetic friction device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1927203A (en) * 1932-12-02 1933-09-19 Tannewitz Works Brake device for band saws
US2286589A (en) * 1940-10-28 1942-06-16 Carl E Tannewitz Blade grabber for band saws
US2395905A (en) * 1944-04-15 1946-03-05 Warner Electri Brake Mfg Compa Electromagnetic friction device

Cited By (57)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2783593A (en) * 1954-05-28 1957-03-05 Lad L Hercik Control mechanism for grinding belt
US3485326A (en) * 1967-10-20 1969-12-23 Mcculloch Corp Magnetic stopping device
FR2352621A1 (en) * 1976-05-25 1977-12-23 Yoneda Kichi Safety device for emergency stop of a tape edge of a cutting apparatus
DE3522585A1 (en) * 1984-06-25 1986-01-02 Amada Co Ltd bandsaw machine
FR2572005A1 (en) * 1984-06-25 1986-04-25 Amada Co Ltd Band saw
US8408106B2 (en) 1999-10-01 2013-04-02 Sd3, Llc Method of operating power equipment with detection and reaction systems
US7788999B2 (en) 1999-10-01 2010-09-07 Sd3, Llc Brake mechanism for power equipment
US7895927B2 (en) 1999-10-01 2011-03-01 Sd3, Llc Power equipment with detection and reaction systems
US9522476B2 (en) 1999-10-01 2016-12-20 Sd3, Llc Power equipment with detection and reaction systems
US7055417B1 (en) 1999-10-01 2006-06-06 Sd3, Llc Safety system for power equipment
US8196499B2 (en) 1999-10-01 2012-06-12 Sd3, Llc Power equipment with detection and reaction systems
US9724840B2 (en) 1999-10-01 2017-08-08 Sd3, Llc Safety systems for power equipment
US7681479B2 (en) 2000-08-14 2010-03-23 Sd3, Llc Motion detecting system for use in a safety system for power equipment
US6957601B2 (en) 2000-08-14 2005-10-25 Sd3, Llc Translation stop for use in power equipment
US8522655B2 (en) 2000-08-14 2013-09-03 Sd3, Llc Logic control for fast-acting safety system
US8191450B2 (en) 2000-08-14 2012-06-05 Sd3, Llc Power equipment with detection and reaction systems
US9038515B2 (en) 2000-08-14 2015-05-26 Sd3, Llc Logic control for fast-acting safety system
US8100039B2 (en) 2000-08-14 2012-01-24 Sd3, Llc Miter saw with safety system
US20020017179A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Miter saw with improved safety system
US7832314B2 (en) 2000-08-14 2010-11-16 Sd3, Llc Brake positioning system
US7921754B2 (en) 2000-08-14 2011-04-12 Sd3, Llc Logic control for fast-acting safety system
US20020017182A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Brake positioning system
US7509899B2 (en) 2000-08-14 2009-03-31 Sd3, Llc Retraction system for use in power equipment
US7610836B2 (en) 2000-08-14 2009-11-03 Sd3, Llc Replaceable brake mechanism for power equipment
US20020017183A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Cutting tool safety system
US8151675B2 (en) 2000-08-14 2012-04-10 Sd3, Llc Logic control for fast-acting safety system
US8065943B2 (en) 2000-09-18 2011-11-29 Sd3, Llc Translation stop for use in power equipment
US8061245B2 (en) 2000-09-29 2011-11-22 Sd3, Llc Safety methods for use in power equipment
US7377199B2 (en) 2000-09-29 2008-05-27 Sd3, Llc Contact detection system for power equipment
US6945148B2 (en) 2000-09-29 2005-09-20 Sd3, Llc Miter saw with improved safety system
US6994004B2 (en) 2000-09-29 2006-02-07 Sd3, Llc Table saw with improved safety system
US8186255B2 (en) 2000-09-29 2012-05-29 Sd3, Llc Contact detection system for power equipment
US6826988B2 (en) 2000-09-29 2004-12-07 Sd3, Llc Miter saw with improved safety system
US7784507B2 (en) 2000-09-29 2010-08-31 Sd3, Llc Router with improved safety system
US6813983B2 (en) 2000-09-29 2004-11-09 Sd3, Llc Power saw with improved safety system
US7231856B2 (en) 2001-06-13 2007-06-19 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US7712403B2 (en) 2001-07-03 2010-05-11 Sd3, Llc Actuators for use in fast-acting safety systems
US20030015253A1 (en) * 2001-07-18 2003-01-23 Gass Stephen F. Router with improved safety system
US7000514B2 (en) * 2001-07-27 2006-02-21 Sd3, Llc Safety systems for band saws
US20030019341A1 (en) * 2001-07-27 2003-01-30 Gass Stephen F. Safety systems for band saws
US7197969B2 (en) 2001-09-24 2007-04-03 Sd3, Llc Logic control with test mode for fast-acting safety system
US7077039B2 (en) 2001-11-13 2006-07-18 Sd3, Llc Detection system for power equipment
US7836804B2 (en) 2003-08-20 2010-11-23 Sd3, Llc Woodworking machines with overmolded arbors
US8498732B2 (en) 2003-12-31 2013-07-30 Sd3, Llc Detection systems for power equipment
US8087438B2 (en) 2003-12-31 2012-01-03 Sd3, Llc Detection systems for power equipment
US9623498B2 (en) 2003-12-31 2017-04-18 Sd3, Llc Table saws
US7827893B2 (en) 2003-12-31 2010-11-09 Sd3, Llc Elevation mechanism for table saws
US8459157B2 (en) 2003-12-31 2013-06-11 Sd3, Llc Brake cartridges and mounting systems for brake cartridges
US8489223B2 (en) 2003-12-31 2013-07-16 Sd3, Llc Detection systems for power equipment
US7991503B2 (en) 2003-12-31 2011-08-02 Sd3, Llc Detection systems for power equipment
US7866239B2 (en) 2003-12-31 2011-01-11 Sd3, Llc Elevation mechanism for table saws
US8122807B2 (en) 2003-12-31 2012-02-28 Sd3, Llc Table saws with safety systems
US7707920B2 (en) 2003-12-31 2010-05-04 Sd3, Llc Table saws with safety systems
US7827890B2 (en) 2004-01-29 2010-11-09 Sd3, Llc Table saws with safety systems and systems to mount and index attachments
US8505424B2 (en) 2004-01-29 2013-08-13 Sd3, Llc Table saws with safety systems and systems to mount and index attachments
US7481140B2 (en) 2005-04-15 2009-01-27 Sd3, Llc Detection systems for power equipment
WO2017040585A1 (en) * 2015-09-01 2017-03-09 Jpw Industries Inc. Power tool with digital variable reluctance motor control

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