US2434174A - Safety brake for band-saw blades - Google Patents

Safety brake for band-saw blades Download PDF

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Publication number
US2434174A
US2434174A US54107144A US2434174A US 2434174 A US2434174 A US 2434174A US 54107144 A US54107144 A US 54107144A US 2434174 A US2434174 A US 2434174A
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United States
Prior art keywords
blade
band
safety brake
saw blades
wedge
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Expired - Lifetime
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Joseph P Morgan
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Joseph P Morgan
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27GACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/06Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for band or strap saws
    • 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D59/00Self-acting brakes, e.g. coming into operation at a predetermined speed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16PSAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P7/00Emergency devices preventing damage to a machine or apparatus
    • F16P7/02Emergency devices preventing damage to a machine or apparatus by causing the machine to stop on the occurrence of dangerous conditions therein
    • 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

Description

Jan. 6, 1948. J. P. MORGAN SAFETY BRAKE FOR BAND SAW BLADES Filed June 19, 1944 Inventor JOSEPH P MORGAN,

and

Wave 13m Patented Jan. 6, 1948 UNITED STATES PATENT OFFICE SAFETY BRAKE FOR BAND-SAW BLADES Joseph P. Morgan, New Castle, Pa.

Application June 19, 1944, Serial N 0. 541,071

, 2 Claims. 1

The present invention relates to new and useful improvements in band saw machines and has for its primary object to provide, in a manner as hereinafter set forth, novel means controlled by the blade, for automatically stopping and firmly holding said blade in the event that it should break or become too loose.

Other objects of the invention are to provide an automatic safety brake of the aforementioned character for band saw blades which will be comparatively simple in construction, strong, durable, reliable, and which may be manufactured at low cost.

All of the foregoing, and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawing wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure 1 is a view in side elevation of an automatic safety brake constructed in accordance with the present invention, showing the device in position on a band saw machine.

Figure 2 is a view in horizontal section, taken substantially on the line 22 of Figure 1.

Figure 3 is a perspective view of the device removed from the band saw machine.

Referring now to the drawing in detail, it will be seen that the embodiment of the invention which has been illustrated comprises an arcuate lever l of suitable metal. The lever l is pivotally secured at 2 for vertical swinging movement in the guard or housing 3 of a conventional band saw machine 4 adjacent one side of the front run of the endless blade 5 and above the usual pair of guide rollers 6 for said blade.

Mounted horizontally on the upper end portion of the lever l is a shaft 1. Journaled on the shaft 1 is a roller 3 of felt, fiber, or other suitable material which is adapted to ride on the endless blade 5. A pull spring 9 has one end connected to the housing 3 and its other end connected to the upper portion of the lever l for engaging the roller 8 with the blade 5.

Mounted on the lower end portion of the lever l is a laterally projecting threaded shank Ill. A wedge ll adjustable in any conventional manner is mounted on the shank l0.

It is thought that the operation of the device will be readily apparent from a consideration of the foregoing. As illustrated to advantage in Figure 1 of the drawing, the roller 8 rides on the front of the blade 5 and a wedge II is positioned adjacent the back of said blade and directed between said blade and the rear guide roller 6. Thus, as long as the blade 5 is functioning under the correct tension the wedge H is held in raised or inoperative position. However, should the blade 5 break or shoud there be too much slack therein, the spring 9 actuates the lever l in a direction to engage the wedge l 1 between the band 5 and the rear guide roller 6. In this manner the blade 5 is arrested and firmly held, thereby preventing further damage to the machine and protecting the operator against injury.

It is believed that a safety brake for band saw blades constructed in accordance with the present invention Will be readily understood, and although a preferred embodiment of the device is as illustrated and described, it is to be understood that changes in the details of construction may be resorted to which will fall within the scope of the invention as claimed.

What I claim is:

1. A brake for band saw machines of the type having a housing, a pair of guide rollers in said housing and an endless blade operable between said rollers, comprising a wedge movably mounted on said housing and engageable-in braking relation between the blade and one of said guide rollers, resilient means biasing said wedge into braking position, and a restraining member for preventing operation of said resilient means, said restraining member including a portion bearing against said blade during normal tensioning thereof.

2. A brake for band saw machines of the type having ahousing, a pairof guide rollers in said housing and en endless blade operable between said rollers, comprising a Wedge movably mounted on said housing and engageable in braking relation between the blade and one of said guide rollers, resilient means biasing said wedge into braking position, and a restraining member for preventing operation of said resilient means, said restraining member including a portion bearing against said blade during normal tensioning thereof, said restraining member further including a lever having the fulcrum intermediate its ends and one end supporting said wedge and its other end supporting a roller bearing against said blade.

JOSEPH P. MORGAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,757,785 Sullenberger May 6, 1930 2,286,589 Tonnewitz June 16, 1942

US54107144 1944-06-19 1944-06-19 Safety brake for band-saw blades Expired - Lifetime US2434174A (en)

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US54107144 US2434174A (en) 1944-06-19 1944-06-19 Safety brake for band-saw blades

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Cited By (62)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3485326A (en) * 1967-10-20 1969-12-23 Mcculloch Corp Magnetic stopping device
US3485327A (en) * 1967-10-20 1969-12-23 Mcculloch Corp Inertia actuated safety brake
US4463638A (en) * 1982-02-18 1984-08-07 Fortin Romeo G Band saw
US20020017183A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Cutting tool safety system
US20020017179A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Miter saw with improved safety system
US20020017178A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Motion detecting system for use in a safety system for power equipment
US20020017182A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Brake positioning system
US20020020271A1 (en) * 2000-08-14 2002-02-21 Gass Stephen F. Spring-biased brake mechanism for power equipment
US20020020263A1 (en) * 2000-08-14 2002-02-21 Gass Stephen F. Firing subsystem for use in a fast-acting safety system
US20020056348A1 (en) * 2000-09-29 2002-05-16 Gass Stephen F. Miter saw with improved safety system
US20020056349A1 (en) * 2000-09-29 2002-05-16 Gass Stephen F. Miter saw with improved safety system
US20020056350A1 (en) * 2000-09-29 2002-05-16 Gass Stephen F. Table saw with improved safety system
US20020059853A1 (en) * 2000-09-29 2002-05-23 Gass Stephen F. Power saw with improved safety system
US20020059855A1 (en) * 2000-09-29 2002-05-23 Gass Stephen F. Miter saw with improved safety system
US20020066346A1 (en) * 2000-09-29 2002-06-06 Gass Stephen F. Miter saw with improved safety system
US20020170400A1 (en) * 2001-05-17 2002-11-21 Gass Stephen F. Band saw with improved safety system
US20030005588A1 (en) * 2001-07-03 2003-01-09 Gass Stephen F. Actuators for use in fast-acting safety systems
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
US20030056853A1 (en) * 2001-09-21 2003-03-27 Gass Stephen F. Router with improved safety system
US20030090224A1 (en) * 2001-11-13 2003-05-15 Gass Stephen F. Detection system for power equipment
US20030140749A1 (en) * 2002-01-25 2003-07-31 Gass Stephen F. Brake Pawls for power equipment
US20040040426A1 (en) * 2002-08-27 2004-03-04 Gass Stephen F. Miter saw with improved safety system
US20040163514A1 (en) * 2001-08-13 2004-08-26 Gass Stephen F. Safety systems for power equipment
US20040173430A1 (en) * 2003-03-05 2004-09-09 Gass Stephen F. Retraction system and motor position for use with safety systems for power equipment
US6826988B2 (en) 2000-09-29 2004-12-07 Sd3, Llc Miter saw with improved safety system
US20050039822A1 (en) * 2003-08-20 2005-02-24 Gass Stephen F. Woodworking machines with overmolded arbors
US20050041359A1 (en) * 2003-08-20 2005-02-24 Gass Stephen F. Motion detecting system for use in a safety system for power equipment
US20050039586A1 (en) * 2003-08-20 2005-02-24 Gass Stephen F. Brake cartridges for power equipment
US20050066784A1 (en) * 2000-09-29 2005-03-31 Gass Stephen F. Safety methods for use in power equipment
US20050139057A1 (en) * 2003-12-31 2005-06-30 Gass Stephen F. Table saws with safety systems
US20050139058A1 (en) * 2003-12-31 2005-06-30 Gass Stephen F. Brake cartridges and mounting systems for brake cartridges
US20050139459A1 (en) * 2003-12-31 2005-06-30 Gass Stephen F. Switch box for power tools with safety systems
US20050139056A1 (en) * 2003-12-31 2005-06-30 Gass Stephen F. Fences for table saws
US20050155473A1 (en) * 2003-12-31 2005-07-21 Gass Stephen F. Dectection systems for power equipment
US20050166736A1 (en) * 2004-01-29 2005-08-04 Gass Stephen F. Table saws with safety systems and systems to mount and index attachments
US20050178259A1 (en) * 2001-08-13 2005-08-18 Gass Stephen F. Miter saw with improved safety system
US6945149B2 (en) 2001-07-25 2005-09-20 Sd3, Llc Actuators for use in fast-acting safety systems
US20050204885A1 (en) * 2002-01-14 2005-09-22 Gass Stephen F Miter saw with improved safety system
US6957601B2 (en) 2000-08-14 2005-10-25 Sd3, Llc Translation stop for use in power equipment
US7024975B2 (en) 2000-08-14 2006-04-11 Sd3, Llc Brake mechanism for power equipment
US7055417B1 (en) 1999-10-01 2006-06-06 Sd3, Llc Safety system for power equipment
US20060230896A1 (en) * 1999-10-01 2006-10-19 Gass Stephen F Miter saw with improved safety system
US7137326B2 (en) 2000-08-14 2006-11-21 Sd3, Llc Translation stop for use in power equipment
US7171879B2 (en) 2001-07-02 2007-02-06 Sd3, Llc Discrete proximity detection system
US7197969B2 (en) 2001-09-24 2007-04-03 Sd3, Llc Logic control with test mode for fast-acting safety system
US20070101842A1 (en) * 2003-08-20 2007-05-10 Gass Stephen F Woodworking machines with overmolded arbors
US7231856B2 (en) 2001-06-13 2007-06-19 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US7284467B2 (en) 2000-08-14 2007-10-23 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US7347851B1 (en) 2004-03-09 2008-03-25 Leo B Kriksunov Needleless hypodermic jet injector apparatus and method
US7350444B2 (en) 2000-08-14 2008-04-01 Sd3, Llc Table saw with improved safety system
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
US7600455B2 (en) 2000-08-14 2009-10-13 Sd3, Llc Logic control for fast-acting safety system
US7610836B2 (en) 2000-08-14 2009-11-03 Sd3, Llc Replaceable brake mechanism for power equipment
US7644645B2 (en) 2002-01-16 2010-01-12 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US8065943B2 (en) 2000-09-18 2011-11-29 Sd3, Llc Translation stop for use in power equipment
CN103522367A (en) * 2013-10-29 2014-01-22 侯如升 Vertical wood cutting saw
US20160297094A1 (en) * 2015-04-07 2016-10-13 King Saw Machinery Ltd. Band Saw Machine with Disk Brake Device
US9724840B2 (en) 1999-10-01 2017-08-08 Sd3, Llc Safety systems for power equipment
US10118308B2 (en) 2013-10-17 2018-11-06 Sawstop Holding Llc Systems to mount and index riving knives and spreaders in table saws

Citations (2)

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US1757785A (en) * 1928-06-02 1930-05-06 Charles E Sullenberger Band sawing machine
US2286589A (en) * 1940-10-28 1942-06-16 Carl E Tannewitz Blade grabber for band saws

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
US1757785A (en) * 1928-06-02 1930-05-06 Charles E Sullenberger Band sawing machine
US2286589A (en) * 1940-10-28 1942-06-16 Carl E Tannewitz Blade grabber for band saws

Cited By (154)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3485326A (en) * 1967-10-20 1969-12-23 Mcculloch Corp Magnetic stopping device
US3485327A (en) * 1967-10-20 1969-12-23 Mcculloch Corp Inertia actuated safety brake
US4463638A (en) * 1982-02-18 1984-08-07 Fortin Romeo G Band saw
US9522476B2 (en) 1999-10-01 2016-12-20 Sd3, Llc Power equipment with detection and reaction systems
US20060180451A1 (en) * 1999-10-01 2006-08-17 Gass Stephen F Switch box for power tools with safety systems
US20060179983A1 (en) * 1999-10-01 2006-08-17 Gass Stephen F Brake mechanism for power equipment
US7055417B1 (en) 1999-10-01 2006-06-06 Sd3, Llc Safety system for power equipment
US20070186737A1 (en) * 1999-10-01 2007-08-16 Gass Stephen F Brake mechanism for power equipment
US7788999B2 (en) 1999-10-01 2010-09-07 Sd3, Llc Brake mechanism for power equipment
US20060000337A1 (en) * 1999-10-01 2006-01-05 Gass Stephen F Band saw with safety system
US7661343B2 (en) 1999-10-01 2010-02-16 Sd3, Llc Brake mechanism for power equipment
US20100213018A1 (en) * 1999-10-01 2010-08-26 Gass Stephen F Brake mechanism for power equipment
US9724840B2 (en) 1999-10-01 2017-08-08 Sd3, Llc Safety systems for power equipment
US7347131B2 (en) 1999-10-01 2008-03-25 Sd3, Llc Miter saw with improved safety system
US7621205B2 (en) 1999-10-01 2009-11-24 Sd3, Llc Band saw with safety system
US8196499B2 (en) 1999-10-01 2012-06-12 Sd3, Llc Power equipment with detection and reaction systems
US8408106B2 (en) 1999-10-01 2013-04-02 Sd3, Llc Method of operating power equipment with detection and reaction systems
US7525055B2 (en) 1999-10-01 2009-04-28 Sd3, Llc Switch box for power tools with safety systems
US10335972B2 (en) 1999-10-01 2019-07-02 Sawstop Holding Llc Table Saws
US20060230896A1 (en) * 1999-10-01 2006-10-19 Gass Stephen F Miter saw with improved safety system
US9969014B2 (en) 1999-10-01 2018-05-15 Sawstop Holding Llc Power equipment with detection and reaction systems
US9925683B2 (en) 1999-10-01 2018-03-27 Sawstop Holding Llc Table saws
US20100236663A1 (en) * 1999-10-01 2010-09-23 Gass Stephen F Power equipment with detection and reaction systems
US7895927B2 (en) 1999-10-01 2011-03-01 Sd3, Llc Power equipment with detection and reaction systems
US20110023673A1 (en) * 1999-10-01 2011-02-03 Gass Stephen F Power equipment with detection and reaction systems
US20070028733A1 (en) * 1999-10-01 2007-02-08 Gass Stephen F Safety methods for use in power equipment
US7359174B2 (en) 2000-08-14 2008-04-15 Sd3, Llc Motion detecting system for use in a safety system for power equipment
US6857345B2 (en) 2000-08-14 2005-02-22 Sd3, Llc Brake positioning system
US20080092702A1 (en) * 2000-08-14 2008-04-24 Gass Stephen F Spring-biased brake mechanism for power equipment
US9038515B2 (en) 2000-08-14 2015-05-26 Sd3, Llc Logic control for fast-acting safety system
US8522655B2 (en) 2000-08-14 2013-09-03 Sd3, Llc Logic control for fast-acting safety system
US20110023670A1 (en) * 2000-08-14 2011-02-03 Gass Stephen F Power equipment with detection and reaction systems
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US8490527B2 (en) 2000-08-14 2013-07-23 Sd3, Llc Power equipment with systems to mitigate or prevent injury
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US7210383B2 (en) 2000-08-14 2007-05-01 Sd3, Llc Detection system for power equipment
US7600455B2 (en) 2000-08-14 2009-10-13 Sd3, Llc Logic control for fast-acting safety system
US20050139051A1 (en) * 2000-08-14 2005-06-30 Gass Stephen F. Brake positioning system
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US20060272463A1 (en) * 2000-08-14 2006-12-07 Gass Stephen F Motion detecting system for use in a safety system for power equipment
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US20050066784A1 (en) * 2000-09-29 2005-03-31 Gass Stephen F. Safety methods for use in power equipment
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US7357056B2 (en) 2000-09-29 2008-04-15 Sd3, Llc Cutting tool safety system
US20020059853A1 (en) * 2000-09-29 2002-05-23 Gass Stephen F. Power saw with improved safety system
US20020170400A1 (en) * 2001-05-17 2002-11-21 Gass Stephen F. Band saw with improved safety system
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US20070131071A1 (en) * 2001-07-02 2007-06-14 Gass Stephen F Discrete proximity detection system
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