US20080016998A1 - System and Method for Rapidly Stopping a Spinning Table Saw Blade - Google Patents

System and Method for Rapidly Stopping a Spinning Table Saw Blade Download PDF

Info

Publication number
US20080016998A1
US20080016998A1 US11/865,956 US86595607A US2008016998A1 US 20080016998 A1 US20080016998 A1 US 20080016998A1 US 86595607 A US86595607 A US 86595607A US 2008016998 A1 US2008016998 A1 US 2008016998A1
Authority
US
United States
Prior art keywords
saw blade
assembly
pin assembly
sensing
spinning
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.)
Abandoned
Application number
US11/865,956
Inventor
David Keller
Original Assignee
Keller David V
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.)
Filing date
Publication date
Priority to US46619903P priority Critical
Priority to US53319203P priority
Priority to US83613204A priority
Priority to US11/025,356 priority patent/US7290474B2/en
Application filed by Keller David V filed Critical Keller David V
Priority to US11/865,956 priority patent/US20080016998A1/en
Publication of US20080016998A1 publication Critical patent/US20080016998A1/en
Application status is Abandoned legal-status Critical

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23DPLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D59/00Accessories specially designed for sawing machines or sawing devices
    • B23D59/001Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade
    • 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
    • B27B5/00Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/29Details; Component parts; Accessories
    • B27B5/38Devices for braking the circular saw blade or the saw spindle; Devices for damping vibrations of the circular saw blade, e.g. silencing
    • 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
    • B27G19/02Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
    • 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
    • F16P3/00Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body 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
    • F16P3/14Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body 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 the means being photocells or other devices sensitive without mechanical contact
    • F16P3/142Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body 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 the means being photocells or other devices sensitive without mechanical contact using image capturing devices
    • 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
    • F16P3/00Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body 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
    • F16P3/14Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body 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 the means being photocells or other devices sensitive without mechanical contact
    • F16P3/144Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body 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 the means being photocells or other devices sensitive without mechanical contact using light grids
    • 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
    • F16P3/00Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body 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
    • F16P3/14Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body 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 the means being photocells or other devices sensitive without mechanical contact
    • F16P3/148Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body 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 the means being photocells or other devices sensitive without mechanical contact using capacitive technology
    • 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
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S83/00Cutting
    • Y10S83/01Safety devices
    • 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
    • Y10T83/04Processes
    • 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
    • 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
    • Y10T83/768Rotatable disc tool pair or tool and carrier
    • Y10T83/7684With means to support work relative to tool[s]
    • Y10T83/773Work-support includes passageway for tool [e.g., slotted table]
    • 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
    • Y10T83/869Means to drive or to guide tool
    • Y10T83/8821With simple rectilinear reciprocating motion only
    • Y10T83/8858Fluid pressure actuated
    • Y10T83/8863Explosive fluid

Abstract

A system for stopping a spinning table saw blade is comprised of a pin assembly disposed adjacent to a saw blade assembly for stopping a spinning saw blade. A receiving block is disposed on a side of the saw blade opposing the pin assembly for receiving the tip of the pin assembly. A driving assembly is coupled to the pin assembly for driving the pin assembly into the spinning saw blade into the receiving block. Finally, a sensing assembly is coupled to at least one of the saw blade assembly and the driving assembly for sensing encroachment of a user's hand in a pre-defined zone. In use, upon sensing a user's hand the sensing assembly signals the driving assembly to stop the spinning saw blade by driving the pin assembly through the saw blade and into the receiving block.

Description

    CROSS-REFERENCE TO RELATED APPLICATIONS
  • The present application is a continuation-in-part of U.S. patent application Ser. No. 10/836,132 filed Apr. 29, 2004 (Attorney Docket No. DEL 03-8-2), which in-turn claims priority under 35 USC §119(e) to provisional U.S. Application No. 60/466,199 filed Apr. 29, 2003 (Attorney Docket No. DEL 03-8-1). In addition, the present application claims priority entitled under 35 U.S.C. §119(e) to provisional U.S. Application No. 60/533,192 filed Dec. 30, 2003 (Attorney Docket No. DEL 03-47-1). Said U.S. patent application Ser. No. 10/836,132 and U.S. Provisional Patent Applications Nos. 60/466,199 and 60/533,192 are herein incorporated by reference in their entirety.
  • FIELD OF THE INVENTION
  • The present invention relates generally to the field of saws and more particularly to a detection system and method for rapidly stopping a spinning saw blade.
  • BACKGROUND OF THE INVENTION
  • There exists a need for an effective method to rapidly stop a spinning saw blade in response to input from a sensing device that detects possible contact of the blade with a user's hand. Currently, various methods of stopping a saw blade under such conditions are available. For example, some methods employ a brake which makes contact with the blade and causes the blade to drop below the table surface if the user's hand has made contact with the saw blade. Additional methods utilize a three-in-one system including a splitter, anti-kickback fingers and a blade cover.
  • All of the presently available systems and methods have one or more disadvantages in terms of convenience of use, early and effective detection of a user's hand and cost. For instance, the system which employs a brake mechanism destroys the saw blade when used. Further, such system requires contact be made between the user and the blade prior to activation of the braking mechanism. Additionally, employment of the three-in-one system severely limits the flexibility of the machine (e.g. user is limited to making through-cuts because the splitter sits higher than the blade, any partial cut such as a groove or a joint may not be done without removing the entire system).
  • Therefore, it would be desirable to design a system and a method for stopping a rapidly spinning table saw blade overcoming the aforementioned limitations of inflexibility and required user/saw blade contact thereby resulting in an efficient, flexible, early to detect stopping system.
  • SUMMARY OF THE INVENTION
  • In a first aspect of the invention, a system for stopping a spinning saw blade is disclosed. Such system is comprised of a pin assembly disposed adjacent to a saw blade assembly for stopping a spinning saw blade. A receiving block is disposed on a side of the saw blade assembly opposing the pin assembly for receiving the tip of the pin assembly. A driving assembly is coupled to the pin assembly for driving the pin assembly into the spinning saw blade into the receiving block. Finally, a sensing assembly is coupled to at least one of the saw blade assembly and the driving assembly for sensing encroachment of a user's hand in a pre-defined zone. In use, upon sensing a user's hand the sensing assembly signals the driving assembly to stop the spinning saw blade by driving the pin assembly through the saw blade and into the receiving block. In additional embodiments of the present invention, the sensing assembly includes shape recognition technology. Further, the pin assembly is actuated by an explosive substance wherein the explosive substance is contained within a replaceable cartridge.
  • In a second aspect of the invention, a method for stopping a rapidly spinning saw blade is disclosed. Such method is comprised of detecting a user's hand in a pre-defined zone by a detecting system and driving a pin assembly through the saw blade into a receiving block to stop the saw blade from spinning upon detecting the presence of a user's hand.
  • BRIEF DESCRIPTION OF DRAWINGS
  • The numerous advantages of the present invention may be better understood by those skilled in the art by reference to the accompanying figures in which:
  • FIG. 1 is an isometric view of a table saw including a sensing assembly in accordance with an exemplary embodiment of the present invention, wherein the sensing assembly includes a video proximity device for detecting a user's hand in a pre-defined zone;
  • FIG. 2 is an isometric illustration in accordance with the video proximity device provided in FIG. 1, wherein the video proximity device further includes a laser;
  • FIG. 3 is an exploded, isometric view of the table saw shown in FIG. 2, illustrating the indication by a laser beam, visible on the hand of the operator, that encroachment into a predefined zone has occurred;
  • FIG. 4 is a front view of a table saw in accordance with an exemplary embodiment of the present invention, wherein the components of the detection system located beneath the table top of the table saw are illustrated;
  • FIG. 5 is an exploded partial view of the table saw illustrated in FIG. 4, wherein the pin assembly is retracted;
  • FIG. 6 is an exploded partial view of the table saw illustrated in FIG. 4, wherein the pin assembly has been actuated; and
  • FIG. 7 is flow chart illustrating a method for stopping a rapidly spinning table saw in accordance with the present invention.
  • DETAILED DESCRIPTION OF THE INVENTION
  • Reference will now be made in detail to the presently preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings.
  • Referring in general to FIGS. 1-6, a detection system for rapidly stopping a spinning saw blade in response to input from a sensing device that detects possible contact of the blade with a user's hand is disclosed. In use, upon sensing a user's hand in a pre-defined zone, a sensing assembly signals a driving assembly to stop the rapidly spinning saw blade by driving a pin assembly through the saw blade and into a receiving block. In one embodiment, the detection system becomes activated prior to a user's hand making contact with the saw blade which is a major advantage over the prior art which requires such contact. Further, the detection system is positioned to allow an workspace on the table top surface to be unobstructed. In additional embodiments, the pin assembly is actuated by an explosive or detonation substance which may be easily replaced after use. As such, the instant invention overcomes the limitations of partial blade disintegration, inflexibility and required user/saw blade contact and thus, yields an efficient, flexible, early to detect stopping system.
  • Referring in general to FIGS. 1-3, an exemplary embodiment of a sensing assembly included within the instant detection system is disclosed. The sensing assembly is for sensing encroachment of a user's hand in a pre-defined zone. In the present embodiment, the sensing assembly is coupled to the saw blade and the driving assembly (not shown, see FIGS. 4-6). Further, in the exemplary embodiment, the sensing assembly is comprised of a video proximity device. The video proximity device may detect the presence of a human body part, such as a human hand and the like, in a predefined zone or point about the working tool element of a power tool. Moreover, in an exemplary embodiment of the present invention, the video proximity device is configured to distinguish between a workpiece, like wood, within the predefined zone or point, and a human body part. The presence of a body part in the predefined zone or point is detected through the use of a video camera positioned for a clear view of the working tool element and the adjacent area. Should a body part enter this zone or point, the sensing assembly initiates appropriate countermeasures to prevent contact. For example, the sensing assembly directs the driving assembly to drive the pin assembly into the saw blade to stop the spinning of such blade. In addition to or in the alternative of stopping the saw blade, the sensing assembly causes power to the saw assembly to be shut-off or for the blade to be mechanically moved away from the user, and the like for preventing contact between the user and working tool.
  • The video proximity device may utilize a number of different techniques for detecting the presence of a human body part. In one embodiment, the video from the video proximity device is analyzed by an information handling system (e.g. a computer) having pattern recognition hardware or software for identifying the unique shapes and patterns of human body parts, as differentiated from the shapes and patterns of a workpiece. For example, a human hand is comprised of a series of rounded edges, while a workpiece generally includes linear edges. In another embodiment, an information handling system includes motion analysis hardware or software capable of detecting the movement of a human body part, as differentiated from the movement of a workpiece. For example, a human hand moves in a non-linear, or somewhat erratic, manner, while a workpiece is directed in a line parallel to the orientation of a tool element. In a further embodiment, the video camera comprises a thermal imaging camera, capable of distinguishing the heat signature of a human body part from the heat signature of a workpiece. For example, a human body part is typically of a higher temperature than the temperature of a workpiece in the same environment, and thus is distinguishable by such a system. It should be noted that one of skill in the art may contemplate other video processing and recognition techniques without departing from the scope and intent of the present invention.
  • The video proximity device may be positioned in a number of different orientations in order to provide a substantially unobstructed view of the working tool element and the adjacent area. In one embodiment, the video proximity device is mounted on an assembly above the support surface. For example, in the case of a table saw, a video camera is mounted on a support assembly above the saw blade, providing a view of the blade and surrounding area. In another embodiment, the video proximity device is mounted to the power tool itself. For example, in the case of a table saw, a video camera is mounted in the fence of the table saw, providing a generally unobstructed view of the blade and surrounding area. Additionally, fiber optic cameras may be desirable in order to minimize intrusion and the like.
  • The video proximity device may be employed in concert with various systems for alerting the operator of their encroachment into a predefined zone or point. In one embodiment, the support surface of the power tool is clearly marked to indicate the limits of one or more predefined zones. For example, in the case of a table saw, a “red zone” is clearly marked on the support surface, indicating that if an operator's body part encroaches into this zone, the saw blade will be stopped by driving a pin assembly into the side of the saw blade. It should be noted that more than one zone may be defined, and the video proximity device may be capable of distinguishing encroachment into different zones. This may serve not only to provide an additional signal to the operator, but also to minimize the situations in which the pin assembly is actuated. In the case of the table saw, the red zone is surrounded by a caution zone or “yellow zone,” for example. If an operator's hand encroaches into the caution/yellow zone, power to the motor driving the saw blade or the working tool is terminated, or the tool is moved below a support surface, causing no permanent damage to the saw blade. Such a configuration may have the added benefit of providing a gradual slowdown for the working tool element. In the case of a table saw utilizing a yellow zone/red zone combination, for example, initially slowing the saw blade in the yellow zone allows the blade to be stopped more quickly and more effectively in the red zone, reducing potential harm to an operator and to the power tool.
  • In another embodiment of the sensing assembly, a laser device is used with the video proximity device for clearly marking the boundaries of a zone. In one embodiment, the laser device projects a beam of visible light onto the support surface/workpiece, indicating to an operator the limits of the zone. This configuration provides the added benefit of visually indicating to the operator encroachment into the zone outlined by the beam, which may appear on the encroaching part of the operator's body.
  • Referring specifically to FIG. 1, a video proximity device is shown for a table saw assembly 100 in accordance with an exemplary embodiment of the first aspect of the present invention. The table saw assembly 100 includes a saw blade 102 surrounded by a red zone 104 and a caution zone/yellow zone 106. A video camera 110 is located directly above the table saw assembly 100, mounted on a support assembly 112. The support assembly 112 provides passage for cables 114 associated with the video camera 112. These cables supply power to the video camera 110 and connect the output of the video camera 110 to a computer or processor having hardware or software for discerning the presence of a human body part in the zones. Upon encroachment of a body part into the yellow zone 106, action is taken by the table saw assembly 100 to stop the saw blade 102. This action may include eliminating power to a motor driving the saw blade 102. Upon encroachment of a body part into the red zone 104, action is taken by the table saw assembly 100 directed toward stopping the saw blade 102 in a more definite manner. For example, a pin assembly 126 is directed into the saw blade 102 or the saw blade 102 is removed to below the support surface of the table saw assembly 100.
  • Referring specifically to FIG. 2, a video proximity device is shown for a table saw assembly 100 in accordance with an exemplary embodiment of the present invention. The table saw assembly 100 includes a saw blade 102 surrounded by a red zone 104 and a yellow zone 106. A video camera 110 is located directly above the table saw assembly 100, mounted on a support assembly 112. The support assembly 112 provides passage for cables 114 associated with the video camera 112. These cables supply power to the video camera 110 and connect the output of the video camera 110 to a information handling system having hardware or software for discerning the presence of a human body part in the red zone 104 and the yellow zone 106. A laser device 120 is included with the video camera 110 and projects a laser beam 122 onto the workpiece/support surface of the table saw assembly 100. Upon encroachment of a body part into the yellow zone 106, an operator is visually cued by the reflectance of the laser beam 122 from a body part encroaching into the zone, and action may be taken by the table saw assembly 100 to stop the saw blade 102. For example, such action includes terminating power to a motor powering the saw blade 102. Further, upon encroachment of a body part into the red zone 104, action is taken by the table saw assembly 100 directed toward stopping the saw blade 102 in a more definite manner. For example, the pin assembly 126 is directed into the saw blade 102 or the saw blade 102 is dropped below the support surface of the table saw assembly 100.
  • Referring specifically to FIG. 3, a laser beam 122 is shown contacting a body part 124 encroaching into a red zone 104 in accordance with a first aspect of the present invention. The laser beam 122 may serve as a visual cue to the operator that encroachment into the red zone 104 has occurred. It should be noted that the area enclosed by the laser beam 122 may correspond with the red zone 104, the yellow zone 106 (See FIGS. 1 and 2), or any number of predefined zones or points. It should also be noted that an operator of a power tool utilizing a video proximity device may define the area of a zone dynamically, and the laser beam 122 may be used to indicate the boundaries of such a zone. It should her be noted that a number of laser beam generating devices may be used to indicate a number of different zones, as contemplated by one of skill in the art.
  • In the alternative to the sensing assembly including a video proximity device, such assembly may recognize the difference in the electrical properties of wood and a user whereby the system projects a high-frequency electrical signal on the saw blade and monitors changes in the signal such as by utilizing one of the assemblies presently known in the art. For example, under normal operating conditions, the signal would remain unaltered for wood includes a relatively small inherent electrical capacitance and conductivity and therefore, the presence of wood in the electrical field would not result in an alteration of such field. However, if a user's hand made contact with the saw blade 102, the detection system 100 would be activated by the sensing assembly detecting a change in the electrical signal as a result of the relatively large inherent capacitance of the user's body. For instance, contact detection electrodes are coupled to the saw blade to detect fluctuations in capacitance.
  • As illustrated in FIGS. 4-6, the stopping system disclosed in the instant invention includes a pin assembly 126. The pin assembly 126 is disposed on a first side of the saw blade 102 for stopping a spinning saw blade. Further, the pin assembly 126 includes a first end. In one embodiment, the first end includes a pointed tip for piercing the saw blade. In additional embodiments, the pin assembly 126 is comprised of heat-treated steel thereby increasing the strength and durability of the pin assembly 126. It is contemplated that additional materials including steel or other metals may be utilized without departing from the scope and spirit of the present invention. Moreover, the size and shape of the pin assembly 126 may vary depending upon the size and dimensions of the saw blade 102 which is to be pierced; however, preferably, such variation will be limited to that which will not result in the significant disintegration of the saw blade 102.
  • In addition to the pin assembly 126, the stopping system includes a driving assembly 128. In an exemplary embodiment, the driving assembly 128 is coupled to the pin assembly 126 for driving the pin assembly 126 into the spinning saw blade 102. Further, the driving assembly 128 includes a communication system which allows the driving assembly 128 to communicate with the sensing assembly. For example, the driving assembly 128 may be hard-wired 130 to the sensing assembly as demonstrated in FIG. 4. In additional embodiments, the driving assembly 128 may be activated by the sensing assembly via an optical signal from the sensing assembly.
  • Moreover, in an exemplary embodiment of the present invention, an explosive or capable of detonation substance is coupled to a piston which upon actuation causes the pin assembly 126 to be propelled into the spinning saw blade. The explosive actuated pin assembly 126 results in such assembly making an instantaneous forced entry into the saw blade 102 causing the saw blade 102 to stop spinning immediately. As such, in one embodiment, the explosive substance is contained in a replaceable cartridge 132 (e.g. a blank cartridge including a .22 or a .27 caliber load). In additional embodiments, the drive assembly 128 may be electromagnetic, mechanical (e.g. a spring system or mallet activated), or the like. It will be appreciated that activation of the pin assembly 126 by the drive assembly 128 will generally require the replacement of the explosive substance (e.g. the replaceable cartridge, 132). However, use of a replaceable cartridge system will allow a user to easily replace the explosive substance prior to resuming use of the saw.
  • In a further embodiment of the present invention, a receiving block 134 is disposed on the second side of the saw blade 102 for receiving the tip of the pin assembly 126. In one exemplary embodiment, as illustrated in FIGS. 5 and 6, the receiving block 134 includes an aperture 136 for receiving the tip of the pin assembly 126. Use of the aperture 136 allows the pin assembly 126 to be received by the receiving block 134 while minimizing the damage to the pin assembly 126 due to interaction with the receiving block 134. Further, the receiving block 134 may be formed of any suitable metal including steel, heat-treated steel, or the like so that contact by the pin assembly 126 does not destroy the receiving block 134.
  • FIGS. 5 and 6 illustrate the pin assembly in either a retracted position or an actuated position, respectively. In FIG. 5, the pin assembly 126 is in the retracted position and the replaceable cartridge 132 is ready for use. In an exemplary embodiment, upon sensing a user's hand or other body part in a predefined zone, the sensing assembly (see FIGS. 1-3) directs the driving assembly 128 to drive the pin assembly 126 into the rapidly spinning saw blade 102. The driving assembly 128 actuates the pin assembly 126 by firing the explosive substance contained in the replaceable cartridge 132 causing the instantaneous firing of the pin assembly 126 through the saw blade 102 into the receiving block 134. As illustrated in FIG. 6 and as discussed previously, the receiving block 134 may be configured with an aperture 136 for receiving the pin assembly 126. In an exemplary embodiment, the size and shape of the aperture 136 corresponds to that of the pin assembly 126.
  • In an additional embodiment, the pin assembly 126 may be retracted from the saw blade 102 and the receiving block 134 by blowing compressed air through a port hole 138 located within the drive assembly 128. Such port hole 138 also functions as an exit for the air generated during the release of the explosive substance.
  • In still a further embodiment, the detection system 100 may include a self-check feature whereby each time the table saw is turned on, the detection system 100 performs a system check to ensure that the system is properly working. If the system is not properly working, the user may be notified by a warning signal including flashing lights or power being cut to the motor. In an additional embodiment, the detection system 100 may include a bypass feature which would allow the system to be turned off if necessary. For example, if the sensing assembly is triggered by detecting a difference in capacity, if a user desires to cut a piece of metal with such saw it would be preferable to turn-off the detection system. The detection system may be set-off unnecessarily whereby the capacitance of a piece of wood is much less than that of a piece of metal and thus, the system may sense a change in capacitance due to the type of material being cut not because of entry of a users hand into a predefined zone. Those of skill in the art will appreciate that while the present drawings illustrate the present invention in use on a table saw, such invention may be adapted to be coupled to variety of power tools including a miter saw, chop saws, radial arm saws, circular saw, and the like without departing from the scope and spirit of the present invention.
  • In addition to the detection system, a method for stopping a spinning saw blade 200 is disclosed. As illustrated in FIG. 7, such method is comprised of cutting material with a saw blade 202. Upon detecting a user's hand in a pre-defined work zone by a detecting system 204, the detecting system including a sensing device, a drive assembly, a pin assembly and a receiving block transmits directions from the sensing device to the drive assembly to drive the pin assembly into the saw blade 206. The drive assembly then drives the pin assembly 124 through the saw blade 104 into the receiving block 130 to stop the saw blade 104 from spinning 208. It is contemplated that the instant method 200 may be utilized with a number of different power tools including a miter saw, circular saw, chop saws, radial arm saws, table saw, and the like.
  • It is believed that the present invention and many of its attendant advantages will be understood by the foregoing description, and it will be apparent that various changes may be made without departing from the scope and spirit of the invention or without sacrificing all of its material advantages. The form herein before described being merely an explanatory embodiment thereof, it is the intention of the following claims to encompass and include such changes.
  • Further, it is understood that the specific order or hierarchy of steps in the methods disclosed are examples of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the method can be rearranged while remaining within the scope of the present invention. The accompanying method claims present elements of the various steps in a sample order, and are not meant to be limited to the specific order or hierarchy presented.

Claims (20)

1. A system for stopping a spinning saw blade, comprising:
a pin assembly disposed adjacent to a saw blade assembly for stopping the spinning saw blade, the pin assembly including a first end, the first end including a pointed tip for piercing the saw blade;
a receiving block disposed on a side of the saw blade opposing the pin assembly for receiving the tip of the pin assembly;
a driving assembly coupled to the pin assembly for driving the pin assembly into the spinning saw blade and into the receiving block; and
a sensing assembly coupled to at least one of the saw blade assembly and the driving assembly for sensing encroachment of a user's hand in a pre-defined zone,
wherein upon sensing a user's hand the sensing assembly signals the driving assembly to stop the spinning saw blade by driving the pin assembly through the saw blade and into the receiving block.
2. The detection system of claim 1, wherein the sensing system comprises a video proximity device.
3. The system for stopping a spinning saw blade of claim 1, wherein the sensing assembly comprises a laser device.
4. The system for stopping a spinning saw blade of claim 1, wherein the sensing assembly comprises a sensor for detecting the difference between the electrical capacitance of a user's hand and a workpiece.
5. The system for stopping a spinning saw blade of claim 1, wherein the sensing assembly comprises a sensor for detecting the difference between the electrical resistance of a user's hand and a workpiece.
6. The system for stopping a spinning saw blade of claim 1, wherein the sensing assembly recognizes the differences between the shapes of human body parts and a workpiece.
7. The system for stopping a spinning saw blade of claim 1, wherein the pin assembly is actuated by a pyrotechnic device.
8. The system for stopping a spinning saw blade of claim 6, wherein the pyrotechnic device is included within a replaceable cartridge.
9. The system for stopping a spinning saw blade of claim 1, wherein the receiving block includes an aperture for receiving the pin assembly.
10. The system for stopping a spinning saw blade of claim 1, wherein the pin assembly is formed of hardened steel.
11. A method of stopping a spinning saw blade, comprising:
detecting a user's hand in a pre-defined zone by a detecting system; and
driving a pin assembly through the saw blade into a receiving block to stop the saw blade from spinning upon detecting the presence of the user's hand.
12. The method of claim 11, wherein the detecting system comprises a video proximity device.
13. The method of claim 11, wherein the detecting system comprises a laser device.
14. The method of claim 11, wherein the detecting system comprises a sensor for detecting the difference between the electrical capacitance of a user's hand and a workpiece.
15. The method of claim 11, wherein the detecting system comprises a sensor for detecting the difference between the electrical resistance of a user's hand and a workpiece.
16. The method of claim 1, wherein the detecting system recognizes the difference between the shapes of human body parts and a workpiece.
17. The method of claim 11, wherein the pin assembly is actuated by a pyrotechnic device.
18. The method of claim 17, wherein the pyrotechnic device is included within a replaceable cartridge.
19. The method of claim 11, wherein the receiving block includes an aperture for receiving the pin assembly.
20. A saw, comprising:
a pin assembly disposed adjacent to a saw blade assembly, the saw blade assembly being configured for receiving a saw blade, the pin assembly including a first end, the first end including a pointed tip for piercing the saw blade;
a receiving block disposed on a side of the saw blade opposing the pin assembly for receiving the tip of the pin assembly;
a driving assembly coupled to the pin assembly for driving the pin assembly into the saw blade and into the receiving block; and
a sensing assembly coupled to at least one of the saw blade assembly and the driving assembly for sensing encroachment of a user's hand in a pre-defined zone,
wherein upon sensing a user's hand the sensing assembly signals the driving assembly to stop the saw blade by driving the tip of the pin assembly through the saw blade and into the receiving block.
US11/865,956 2003-04-29 2007-10-02 System and Method for Rapidly Stopping a Spinning Table Saw Blade Abandoned US20080016998A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US46619903P true 2003-04-29 2003-04-29
US53319203P true 2003-12-30 2003-12-30
US83613204A true 2004-04-29 2004-04-29
US11/025,356 US7290474B2 (en) 2003-04-29 2004-12-29 System for rapidly stopping a spinning table saw blade
US11/865,956 US20080016998A1 (en) 2003-04-29 2007-10-02 System and Method for Rapidly Stopping a Spinning Table Saw Blade

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/865,956 US20080016998A1 (en) 2003-04-29 2007-10-02 System and Method for Rapidly Stopping a Spinning Table Saw Blade

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US11/025,356 Continuation US7290474B2 (en) 2003-04-29 2004-12-29 System for rapidly stopping a spinning table saw blade

Publications (1)

Publication Number Publication Date
US20080016998A1 true US20080016998A1 (en) 2008-01-24

Family

ID=36314980

Family Applications (2)

Application Number Title Priority Date Filing Date
US11/025,356 Expired - Fee Related US7290474B2 (en) 2003-04-29 2004-12-29 System for rapidly stopping a spinning table saw blade
US11/865,956 Abandoned US20080016998A1 (en) 2003-04-29 2007-10-02 System and Method for Rapidly Stopping a Spinning Table Saw Blade

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US11/025,356 Expired - Fee Related US7290474B2 (en) 2003-04-29 2004-12-29 System for rapidly stopping a spinning table saw blade

Country Status (1)

Country Link
US (2) US7290474B2 (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070028733A1 (en) * 1999-10-01 2007-02-08 Gass Stephen F Safety methods for use in power equipment
US20080092702A1 (en) * 2000-08-14 2008-04-24 Gass Stephen F Spring-biased brake mechanism for power equipment
US20090241746A1 (en) * 2008-03-25 2009-10-01 Power Tool Institute Saw accessories and clamp for use therewith
US20090241748A1 (en) * 2008-03-25 2009-10-01 Power Tool Institute Safety devices for saws
US7628101B1 (en) 2006-03-13 2009-12-08 Power Tool Institute Pyrotechnic drop mechanism for power tools
US7640837B2 (en) 2000-08-14 2010-01-05 Sd3, Llc Table saw with improved safety system
US7644645B2 (en) 2002-01-16 2010-01-12 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US7661343B2 (en) 1999-10-01 2010-02-16 Sd3, Llc Brake mechanism for power equipment
WO2010144627A2 (en) * 2009-06-09 2010-12-16 Butler David J Health and safety system for a table saw
US8082825B2 (en) 2009-06-09 2011-12-27 Butler David J Health and safety system for a table saw
US8534174B2 (en) 2010-09-27 2013-09-17 Power Tool Institute Pyrotechnic actuator and power cutting tool with safety reaction system having such pyrotechnic actuator
US8919231B2 (en) 2008-11-19 2014-12-30 Power Tool Institute Safety mechanisms for power tools
US9724840B2 (en) 1999-10-01 2017-08-08 Sd3, Llc Safety systems for power equipment
US9927796B2 (en) 2001-05-17 2018-03-27 Sawstop Holding Llc Band saw with improved safety system

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020017179A1 (en) * 2000-08-14 2002-02-14 Gass Stephen F. Miter saw with improved safety system
US7290472B2 (en) 2002-01-14 2007-11-06 Sd3, Llc Miter saw with improved safety system
US6922153B2 (en) * 2003-05-13 2005-07-26 Credo Technology Corporation Safety detection and protection system for power tools
US7350445B2 (en) * 2003-08-20 2008-04-01 Sd3, Llc Brake cartridge for power equipment
US7707920B2 (en) 2003-12-31 2010-05-04 Sd3, Llc Table saws with safety systems
US7536238B2 (en) 2003-12-31 2009-05-19 Sd3, Llc Detection systems for power equipment
CN100515644C (en) * 2004-05-20 2009-07-22 小松产机株式会社 Cutting machine and method of moving cutting head
US7481140B2 (en) * 2005-04-15 2009-01-27 Sd3, Llc Detection systems for power equipment
US20100037739A1 (en) * 2005-06-01 2010-02-18 Anderson Will H Power cutting tool with overhead sensing system
DE102007041098A1 (en) * 2006-09-04 2008-03-06 Robert Bosch Gmbh Machine tool monitoring device
DE102007039570A1 (en) * 2006-09-04 2008-03-06 Robert Bosch Gmbh Machine tool monitoring device
WO2008071805A1 (en) * 2006-12-15 2008-06-19 Fachhochschule Bonn-Rhein-Sieg A manually fed machine for working on materials, objects and the like, and protective means for such a machine
DE102007044804A1 (en) * 2007-09-20 2009-04-09 Robert Bosch Gmbh Machine tool safety device
DE102007062951A1 (en) * 2007-12-21 2009-06-25 Robert Bosch Gmbh Machine tool device
DE102007062949A1 (en) * 2007-12-21 2009-06-25 Robert Bosch Gmbh Machine tool device
JP2010023186A (en) * 2008-07-18 2010-02-04 Makita Corp Cutter
US8122798B1 (en) 2008-11-19 2012-02-28 Power Tool Institute Power cutting tool with proximity sensing system
DE102008055062A1 (en) * 2008-12-22 2010-06-24 Robert Bosch Gmbh Intervention protection system for machines
DE102009054491A1 (en) * 2009-12-10 2011-06-16 Robert Bosch Gmbh Monitoring device of a machine tool
US8950305B1 (en) * 2011-08-09 2015-02-10 Innovative Engineering Solutions, Inc. Saw brake
US8336432B1 (en) * 2011-08-19 2012-12-25 David J Butler Safety system for machine tools
ITCN20120002A1 (en) * 2012-01-13 2013-07-14 Vittore Giraudo Machine tools or similar equipment, with sensors with an automatic device for the safety stop
US20140182430A1 (en) * 2012-12-31 2014-07-03 Robert Bosch Gmbh Saw Device with Detection System
US9511429B2 (en) * 2013-03-15 2016-12-06 Robert BoschTool Corporation Blade drop for power device and method of manufacturing thereof
EP3071382B1 (en) * 2013-11-18 2019-03-13 Robert Bosch GmbH Power tool with capacitive injury mitigation system
WO2015096999A1 (en) * 2013-12-24 2015-07-02 Robert Bosch Gmbh Power tool with ultrasonic sensor for sensing contact between an implement and an object
US20170252939A1 (en) * 2014-08-26 2017-09-07 Keith Blenkinsopp Productivity enhancement for band saw
US20160263679A1 (en) * 2015-03-12 2016-09-15 Robert Bosch Tool Corporation Power Tool Motor with Reduced Electrical Noise
US9849527B2 (en) * 2015-03-12 2017-12-26 Robert Bosch Tool Corporation Power tool with lightweight actuator housing
US9868167B2 (en) * 2015-03-12 2018-01-16 Robert Bosch Tool Corporation Power tool with drop arm orbit bracket
US10053964B2 (en) * 2016-06-30 2018-08-21 Specialty Earth Sciences, Llc Apparatus and method for puncturing a pipe

Family Cites Families (145)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US411925A (en) 1889-10-01 Cut-off sawing-machine
US3124178A (en) * 1964-03-10 Circular saw version of a multi-purpose
US299619A (en) * 1884-06-03 Shingle-jointing machine
US408790A (en) 1889-08-13 Gang circular sawing machine
US714098A (en) 1902-01-06 1902-11-18 John David Caldwell Shingle-edging machine.
US1476238A (en) 1922-02-20 1923-12-04 Sumner M Bump Indicator for edging saws
US1804764A (en) * 1928-12-01 1931-05-12 Edwin J Grant Apparatus for and method of cutting material
US2109976A (en) * 1936-11-23 1938-03-01 Jr Winslow S Pierce Center finding device
CH202014A (en) * 1937-03-20 1938-12-31 Lindner Gmbh Herbert Device for aligning a pivoting indexing table to the axis of the drill spindle.
US2121069A (en) * 1937-06-14 1938-06-21 Atlas Press Company Circular saw
US2307820A (en) * 1940-02-20 1943-01-12 Charles M Butters Shadow-line indicator for trimming saws
US2299262A (en) 1940-04-29 1942-10-20 Uremovich Mark Power-driven bench saw
US2357194A (en) 1942-01-13 1944-08-29 Cincinnati Shaper Co Gauging device
US2407845A (en) 1943-01-16 1946-09-17 California Inst Res Found Aligning device for tools
US2557029A (en) * 1945-03-24 1951-06-12 Griffin Richard Stanley Optical centering gauge
US2488947A (en) 1945-05-28 1949-11-22 American Floor Surfacing Mach Rotary power handsaw
US2465000A (en) * 1946-09-03 1949-03-22 Norbert O Turner Adjustable sawing machine table
US2518684A (en) 1949-04-21 1950-08-15 Hyman M Harris Duplex bench saw
CH323681A (en) 1954-04-23 1957-08-15 Raimann Gmbh B Directional lighting system on woodworking machines such. B. gang saws, circular saws or the like
US2855679A (en) 1955-11-08 1958-10-14 Howard G Gibble Gage attachment for drills
US2850054A (en) 1956-07-09 1958-09-02 Yates American Machine Co Tilting arbor saw
US3005477A (en) 1957-12-23 1961-10-24 Horstmann & Sherwen Ltd Rotary tool wood working machines
US3013592A (en) 1959-03-23 1961-12-19 Theodore G Ambrosio Tilting table saw
US3011529A (en) 1959-09-08 1961-12-05 Rockwell Mfg Co Tilt and elevating mechanism for tilting arbor saws
US3179458A (en) * 1962-01-16 1965-04-20 Thomas G Sconzo Strike plate
US3344819A (en) 1965-10-20 1967-10-03 Donald H Benson Table saw
US3597091A (en) 1968-01-18 1971-08-03 Itek Corp Interferometer
US3572937A (en) * 1968-11-04 1971-03-30 Atomic Energy Commission Method and apparatus for interferometric measurement of machine slide roll
CH521821A (en) * 1969-12-24 1972-04-30 Oerlikon Buehrle Ag Machine tool with a straight line to be moved part
GB1300672A (en) * 1970-01-13 1972-12-20 Nitto Giken Kk Method and apparatus for centering a tool in drilling machines
US3635108A (en) * 1970-03-09 1972-01-18 Us Navy Laser-guided boring tool for deep hole boring
US3780777A (en) 1971-10-06 1973-12-25 Oliver Machinery Co Defecting saw
US3854836A (en) 1973-01-02 1974-12-17 B Weissman Drilling machine for plaster casts or models
SE373184B (en) * 1973-05-15 1975-01-27 Atlas Copco Ab
US3837757A (en) 1973-05-29 1974-09-24 A Levine Drill press
JPS5845003B2 (en) 1973-09-07 1983-10-06 Fuji Photo Film Co Ltd
GB1488841A (en) 1974-01-18 1977-10-12 Plessey Co Ltd Optical detection apparatus
US4046985A (en) 1974-11-25 1977-09-06 International Business Machines Corporation Semiconductor wafer alignment apparatus
US3970359A (en) * 1975-02-03 1976-07-20 Xerox Corporation Flying spot flat field scanner
DE2650733A1 (en) * 1976-11-05 1978-05-18 Dynamit Nobel Ag Fastener having a cavity containing an explosive device
US4078869A (en) * 1977-01-17 1978-03-14 Honeycutt Damon P Two-way right angle drill
NO139405C (en) * 1977-04-01 1979-03-07 Arne Gjerde Motorized saw with circular blade.
US4338723A (en) * 1977-10-19 1982-07-13 Centro Cororation Angle measuring device
US4386532A (en) * 1980-01-04 1983-06-07 Centro Corporation Instrumented tool
US4257297A (en) * 1979-01-31 1981-03-24 Peter Nidbella Circular saw with visual cut line indicator
US4255056A (en) * 1979-03-30 1981-03-10 Hardinge Brothers, Inc. Pre-setter for positioning tooling on turrets
US4319403A (en) * 1980-09-29 1982-03-16 Stearns Eugene R Power drill position indicator
FR2491614B1 (en) * 1980-10-08 1984-12-07 Couturier Alain
US4413662A (en) 1981-06-08 1983-11-08 Forest Industries Machine Corp. Edging system
US4450627A (en) * 1981-07-06 1984-05-29 Shindaiwa Kogyo Co., Ltd. Device for determining a correct sawing position for a portable rotary sawing machine
JPH049286B2 (en) 1981-10-31 1992-02-19
US4438567A (en) * 1981-12-07 1984-03-27 Raiha A P Center locator for alignment of work to machine spindle
US4503740A (en) * 1982-01-18 1985-03-12 Capital Machine Company, Inc. Optical cutting edge locator for a cutting apparatus
US4581808A (en) * 1982-02-04 1986-04-15 The Charles Stark Draper Laboratory Adjustable machining system and implement therefore
US4469318A (en) 1982-04-22 1984-09-04 Slavic Fred M Work piece guide for table saws and the like
US4447956A (en) * 1982-08-26 1984-05-15 Chung Hun H Centering device
US4534093A (en) 1982-09-07 1985-08-13 Textron Inc. Beo-type machining system
US4469931A (en) 1982-09-13 1984-09-04 Macken John A Laser assisted saw device
US4468992A (en) 1982-12-13 1984-09-04 Mcgeehee Ronald W Automatic sawing system
US4651732A (en) * 1983-03-17 1987-03-24 Frederick Philip R Three-dimensional light guidance system for invasive procedures
JPH0338962B2 (en) * 1983-08-13 1991-06-12 Matsushita Electric Works Ltd
US4566202A (en) * 1983-12-06 1986-01-28 Hamar M R Laser apparatus for effectively projecting the axis of rotation of a rotating tool holder
FR2559707B1 (en) 1984-02-20 1986-07-25 Smid Sa A guiding device for a sawing machine carriage
US4836671A (en) * 1985-04-08 1989-06-06 Charles Lescrenier Locating device
FR2584003B1 (en) * 1985-06-29 1992-04-10 Amada Co Ltd Cutting device of long products
US4598481A (en) * 1985-08-12 1986-07-08 Hein-Werner Corporation Intersecting laser alignment apparatus and method
CH671873A5 (en) * 1985-10-03 1989-10-13 Synthes Ag
US4723911A (en) * 1985-11-13 1988-02-09 University Of Pittsburgh Intelligent dental drill
US4676130A (en) * 1986-02-25 1987-06-30 Filer & Stowell Co., Inc. Lumber edger
US4820911A (en) * 1986-07-11 1989-04-11 Photographic Sciences Corporation Apparatus for scanning and reading bar codes
US4725933A (en) * 1986-09-11 1988-02-16 Fairway International, Inc. Line guide projector
US4817839A (en) * 1987-02-13 1989-04-04 Ipco Corporation Rotary saw and method for sectioning dental models
US4885965A (en) 1987-02-13 1989-12-12 Ipco Corporation Rotary saw for sectioning dental models
JPS63229250A (en) 1987-03-13 1988-09-26 Kitamura Mach Co Ltd Machining center
US4833782A (en) * 1987-06-01 1989-05-30 Robert E. Strauss Saber saw tracing light
US4887193A (en) 1987-12-15 1989-12-12 Dieckmann Ralf E Mounting apparatus for a lamp or similar device
DE3806625A1 (en) * 1988-03-02 1989-09-14 Hilti Ag A powder driven setzgeraet
US4945797A (en) 1988-05-06 1990-08-07 Buss Automation, Inc. Automated multiple rip saw feeding apparatus
US4934233B1 (en) * 1988-06-29 1994-08-23 Emerson Electric Co Compound miter saw
US4885967A (en) 1988-08-25 1989-12-12 J. Gibson Mcilvain Company Laser alignment device for sawmills
CA1327284C (en) 1989-02-21 1994-03-01 Stewart F. Macdonald Drill guide and support therefor
US4978246A (en) 1989-07-18 1990-12-18 Quenzi Philip J Apparatus and method for controlling laser guided machines
IT221285Z2 (en) 1989-10-18 1994-02-25 Selco Srl cutting station of a machine for cutting panels.
US5917523A (en) * 1990-01-12 1999-06-29 Hewlett-Packard Company Refill method for ink-jet print cartridge
US5013317A (en) * 1990-02-07 1991-05-07 Smith & Nephew Richards Inc. Medical drill assembly transparent to X-rays and targeting drill bit
US5031203A (en) * 1990-02-09 1991-07-09 Trecha Randal R Coaxial laser targeting device for use with x-ray equipment and surgical drill equipment during surgical procedures
US4964449A (en) 1990-03-27 1990-10-23 Conners John M Miter saw track
US5038481A (en) 1990-05-04 1991-08-13 Lonnie Smith Saber saw tracking light
US5161922A (en) 1990-12-11 1992-11-10 The Boeing Company Electronic micro-stop/tool failure monitor
US5148232A (en) 1991-01-28 1992-09-15 Intra Corporation Laser apparatus and method for aligning a crankpin grinding machine
US5159864A (en) 1991-09-23 1992-11-03 Wedemeyer Arlan B Insert for a table saw
US5207007A (en) * 1991-11-25 1993-05-04 Cucinotta Anthony J Set-up tool
US5203650A (en) * 1992-01-09 1993-04-20 Everett D. Hougen Method and apparatus for drilling holes
US5212720A (en) * 1992-01-29 1993-05-18 Research Foundation-State University Of N.Y. Dual radiation targeting system
US5320111A (en) * 1992-02-07 1994-06-14 Livingston Products, Inc. Light beam locator and guide for a biopsy needle
US5316014A (en) * 1992-02-07 1994-05-31 Livingston Products, Inc. Biopsy locator and guide
AU676165B2 (en) * 1992-04-23 1997-03-06 Townsend Engineering Company Meat slicing machine and method of use thereof
US5285708A (en) * 1992-05-18 1994-02-15 Porter-Cable Corporation Miter saw alignment system
US5375495A (en) 1992-05-18 1994-12-27 Porter-Cable Corporation Optical alignment system for circular power saws
JP2630537B2 (en) 1992-05-22 1997-07-16 株式会社マキタ Miter saw machine
US5283808A (en) * 1992-07-01 1994-02-01 Diasonics, Inc. X-ray device having a co-axial laser aiming system in an opposed configuration
GB2280343A (en) * 1993-07-08 1995-01-25 Innovative Care Ltd A laser targeting device for use with image intensifiers
US5267129A (en) 1992-07-24 1993-11-30 Pnu-Light Tool Works, Inc. Pneumatic lighting apparatus
US5387969A (en) * 1993-06-22 1995-02-07 Optima Industries, Inc. Machine tool position measurement employing multiple laser distance measurements
US5365822A (en) 1993-09-17 1994-11-22 Stapleton Michael F Cutting guide
KR0158728B1 (en) * 1993-12-27 1999-01-15 마사카주 카키모토 Drilling apparatus
DE69514016D1 (en) * 1994-02-28 2000-01-27 Cybernetics Products Inc Drilling coordinates optimization for multi-layer printed circuit boards
US5593606A (en) * 1994-07-18 1997-01-14 Electro Scientific Industries, Inc. Ultraviolet laser system and method for forming vias in multi-layered targets
US5495784A (en) * 1994-09-29 1996-03-05 Chen; Ruey-Zon Cutting depth setting device for a saw machine
GB9425391D0 (en) * 1994-12-12 1995-02-15 Black & Decker Inc Bevel table saw adjustment
US5488781A (en) * 1994-12-13 1996-02-06 Av Flexologic B.V. Positioning apparatus for printing plates
DE19501069A1 (en) * 1995-01-16 1996-07-18 Wolfgang Kloess Light sighting device for marking guide path of instrument, esp. diagnostic or therapeutic needle
US5741096A (en) * 1995-11-30 1998-04-21 The Boeing Company Line-laser assisted alignment apparatus
US5862727A (en) * 1996-03-11 1999-01-26 Kelly; Robert R. Laser arbor
US5784792A (en) * 1996-05-13 1998-07-28 Smith; James A. Hand-held laser level grade checking device
US5794351A (en) * 1996-05-31 1998-08-18 Black & Decker, Inc. Window assembly and lower saw guard for circular saw
DE69730562T2 (en) * 1996-06-18 2005-10-13 Fuji Photo Film Co., Ltd., Minami-Ashigara Image reader
US5777562A (en) * 1996-08-19 1998-07-07 Hoffman; David J. Centering device and method for centering
JPH10253916A (en) * 1997-03-10 1998-09-25 Semiconductor Energy Lab Co Ltd Laser optical device
US6263584B1 (en) * 1997-08-08 2001-07-24 Barry S. Owens Alignment apparatus and method of using same
US6035757A (en) * 1997-12-15 2000-03-14 Caluori; Raymond Rotary saw cut alignment device
US5970835A (en) * 1998-09-10 1999-10-26 Black & Decker Inc. Throat plate for a tool
US6536536B1 (en) * 1999-04-29 2003-03-25 Stephen F. Gass Power tools
US6530303B1 (en) * 1999-06-10 2003-03-11 Black & Decker Inc. Table saw
US6492182B1 (en) * 1999-07-28 2002-12-10 The Research Foundation Of State University Of New York Microsensor arrays and method of using same for detecting analytes
US6375395B1 (en) * 1999-07-30 2002-04-23 Michael G. Heintzeman Laser guide for hand held power drill
US6209597B1 (en) * 1999-09-08 2001-04-03 Hal Calcote Power tool mounting stand
US6223794B1 (en) * 2000-02-05 2001-05-01 James Jones Woodworking station
FR2807693B1 (en) * 2000-04-14 2002-08-02 Georges Brun A trimming wane boards
US6413022B1 (en) * 2000-09-18 2002-07-02 The Boeing Company Vacuum clamp device
US20020054491A1 (en) * 2000-11-03 2002-05-09 Iram Casas Lighting apparatus for tools
TW464585B (en) * 2000-11-22 2001-11-21 Hannstar Display Corp Laser aided pressing device and the adjusting method of pressing position
US6739042B2 (en) * 2000-12-15 2004-05-25 Siemens Vdo Automotive Corporation Method for assembling a mechatronics sensor
US6546835B2 (en) * 2001-01-25 2003-04-15 Tian Wang Wang Saw blade adjusting device for table saw
US6550118B2 (en) * 2001-02-02 2003-04-22 Electroimpact, Inc. Apparatus and method for accurate countersinking and rivet shaving for mechanical assembly operations
AU2002250142A1 (en) * 2001-02-22 2002-09-12 Toolz, Ltd. Detecting tool orientation alignment depth and leveling
US6736042B2 (en) * 2001-03-01 2004-05-18 Porter-Cable Corporation Work piece guiding system for a table saw
US20030010173A1 (en) * 2001-07-13 2003-01-16 Hayden James Alan Precision laser cutting guide
US6810596B2 (en) * 2001-07-26 2004-11-02 Black & Decker Inc. Drill level indicator
US6565227B1 (en) * 2001-11-13 2003-05-20 Greg Davis Method and device for tool alignment
US6688203B2 (en) * 2001-11-27 2004-02-10 Rexon Co., Ltd. Circular sawing machine having indication device
US6722242B2 (en) * 2001-12-05 2004-04-20 Bor Yann Chuang Transmission device of a table saw
US6684750B2 (en) * 2002-04-29 2004-02-03 Shi-Hui Yu Structure of a connection seat and a suspension seat of the connection seat for a suspension round saw
US6937336B2 (en) * 2002-08-15 2005-08-30 Black & Decker, Inc. Optical alignment system for power tool
US6736044B2 (en) * 2002-10-07 2004-05-18 Chin-Chin Chang Table saw having a blade suspension structure

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110023673A1 (en) * 1999-10-01 2011-02-03 Gass Stephen F Power equipment with detection and reaction systems
US9724840B2 (en) 1999-10-01 2017-08-08 Sd3, Llc Safety systems for power equipment
US9522476B2 (en) 1999-10-01 2016-12-20 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
US8196499B2 (en) 1999-10-01 2012-06-12 Sd3, Llc 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
US7895927B2 (en) 1999-10-01 2011-03-01 Sd3, Llc Power equipment with detection and reaction systems
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
US20100236663A1 (en) * 1999-10-01 2010-09-23 Gass Stephen F Power equipment with detection and reaction systems
US9969014B2 (en) 1999-10-01 2018-05-15 Sawstop Holding Llc Power equipment with detection and reaction systems
US8191450B2 (en) 2000-08-14 2012-06-05 Sd3, Llc Power equipment with detection and reaction systems
US8011279B2 (en) 2000-08-14 2011-09-06 Sd3, Llc Power equipment with systems to mitigate or prevent injury
US7640837B2 (en) 2000-08-14 2010-01-05 Sd3, Llc Table saw with improved safety system
US8490527B2 (en) 2000-08-14 2013-07-23 Sd3, Llc Power equipment with systems to mitigate or prevent injury
US20080092702A1 (en) * 2000-08-14 2008-04-24 Gass Stephen F Spring-biased brake mechanism for power equipment
US9927796B2 (en) 2001-05-17 2018-03-27 Sawstop Holding Llc Band saw with improved safety system
US7644645B2 (en) 2002-01-16 2010-01-12 Sd3, Llc Apparatus and method for detecting dangerous conditions in power equipment
US8074546B1 (en) 2005-03-11 2011-12-13 Power Tool Institute Pyrotechnic drop mechanism for power tools
US7628101B1 (en) 2006-03-13 2009-12-08 Power Tool Institute Pyrotechnic drop mechanism for power tools
US9381667B2 (en) 2008-03-25 2016-07-05 Power Tool Institute Saw accessories and clamp for use therewith
US20120067186A1 (en) * 2008-03-25 2012-03-22 Power Tool Institute Safety devices for saws
US20090241748A1 (en) * 2008-03-25 2009-10-01 Power Tool Institute Safety devices for saws
US8479627B2 (en) * 2008-03-25 2013-07-09 Power Tool Institute Safety devices for saws
US8091456B2 (en) * 2008-03-25 2012-01-10 Power Tool Institute Safety devices for saws
US9522475B2 (en) 2008-03-25 2016-12-20 Power Tool Institute Safety devices for saws
US20090241746A1 (en) * 2008-03-25 2009-10-01 Power Tool Institute Saw accessories and clamp for use therewith
US8082826B2 (en) 2008-03-25 2011-12-27 Power Tool Institute Saw accessories and clamp for use therewith
US8919231B2 (en) 2008-11-19 2014-12-30 Power Tool Institute Safety mechanisms for power tools
WO2010144627A3 (en) * 2009-06-09 2012-05-10 Butler David J Health and safety system for a table saw
US8082825B2 (en) 2009-06-09 2011-12-27 Butler David J Health and safety system for a table saw
WO2010144627A2 (en) * 2009-06-09 2010-12-16 Butler David J Health and safety system for a table saw
US8534174B2 (en) 2010-09-27 2013-09-17 Power Tool Institute Pyrotechnic actuator and power cutting tool with safety reaction system having such pyrotechnic actuator

Also Published As

Publication number Publication date
US7290474B2 (en) 2007-11-06
US20060096425A1 (en) 2006-05-11

Similar Documents

Publication Publication Date Title
US7024975B2 (en) Brake mechanism for power equipment
US7621205B2 (en) Band saw with safety system
US8402869B2 (en) Brake mechanism for power equipment
US20110138978A1 (en) Brake cartridges for power equipment
US20020020265A1 (en) Translation stop for use in power equipment
US20030002942A1 (en) Discrete proximity detection system
US7100483B2 (en) Firing subsystem for use in a fast-acting safety system
US8065943B2 (en) Translation stop for use in power equipment
US8638428B2 (en) Method and apparatus for using optical feedback to detect fiber breakdown during surgical laser procedures
US7610836B2 (en) Replaceable brake mechanism for power equipment
US7359174B2 (en) Motion detecting system for use in a safety system for power equipment
US7308843B2 (en) Spring-biased brake mechanism for power equipment
US20020017181A1 (en) Retraction system for use in power equipment
US7098800B2 (en) Retraction system and motor position for use with safety systems for power equipment
US9724840B2 (en) Safety systems for power equipment
CA2389596C (en) Safety systems for power equipment
CN1787898B (en) Power tools
US20050139459A1 (en) Switch box for power tools with safety systems
EP1589279B1 (en) Safety method for a machine tool and optoelectronic sensor for carrying out such a method
US6742430B2 (en) Circular sawing machine having a hidden-type infrared guide device
US7290472B2 (en) Miter saw with improved safety system
US8408107B2 (en) Power tool safety mechanisms
US7350444B2 (en) Table saw with improved safety system
US6877410B2 (en) Miter saw with improved safety system
US20020056348A1 (en) Miter saw with improved safety system

Legal Events

Date Code Title Description
STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION