New! View global litigation for patent families

US3186256A - Safety guards for brakes, punch presses and similar machines - Google Patents

Safety guards for brakes, punch presses and similar machines Download PDF

Info

Publication number
US3186256A
US3186256A US29773363A US3186256A US 3186256 A US3186256 A US 3186256A US 29773363 A US29773363 A US 29773363A US 3186256 A US3186256 A US 3186256A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
guard
safety
switch
die
position
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
Reznick Louis
Original Assignee
Reznick Louis
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
Grant date

Links

Images

Classifications

    • 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
    • F16P3/02Screens or other safety members moving in synchronism with members which move to and fro
    • F16P3/04Screens or other safety members moving in synchronism with members which move to and fro for machines with parts which approach one another during operation, e.g. for stamping presses
    • 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
    • Y10T74/00Machine element or mechanism
    • Y10T74/21Elements
    • Y10T74/2193Guard mechanisms
    • Y10T74/2194Automatic
    • Y10T74/2196Reciprocating member actuator

Description

L. REZNICK June 1, 1965 SAFETY GUARDS FOR BRAKES, PUNCH PRESSES AND SIMILAR MACHINES Original Filed Dec. 27, 1961 I FIGS INVENTOR, LOUIS REZNICK/ AT TORN EY United States Patent 3,186,256 SAFETY GUARDS FUR BRAKES, PUNCH PRESE AND STMILAR MACHINES Louis Reznick, 231 Brightwater Court, Brooklyn, N.Y. Continuation of application Ser. N 162,528, Dec. 27, 1961. This application .luiy 22, 1963, Ser. No. 297,733 Claims. ((11. 74-415) This application is a continuation of my application Serial No. 162,528 filed December 27, 1961, which is now abandoned.

The present invention relates to safety guards for power-driven machinery and more particularly to a type adaptable for use on power brakes, punch presses and the like.

A power brake is a machine for bending metal sheets and essentially includes a ram carrying a male die part, movable therewith towards and then away from the female die part mounted on a fixed bed. The female die part is an upright channel. In operating the machine to make .a bend, the sheet portion in front of the die is swung upward with extreme rapidity. In the trade, this occurrence is called whip. The safety guard must of course be in front of the die and offer clearance for feeding a sheet between the die parts, and yet guard against the entrance of a finger.

An object of this invention is to provide a novel and improved safety guard for a power brake, which will be automatically shifted in proper time to allow the upward movement of the whipped forward portion of the work so that such movement is unmolested, whether ram movernent is speedy or slow. At all times, of course, the guard shall be in such position that there is no possibility of hurt to the operator.

Another object thereof is to provide automatic safety guards for power brakes, punch presses and the like, which are reasonably cheap to manufacture, easy to install and efficient in carrying out the purposes for which they are designed.

For the practice of this invention, one form it may assume is to have the safety guard be a vertically positioned panel of two elongated, horizontally extending, hingedtogether sections which are one above the other and close in front of the die parts. The extent of the panel is beyond the ends of the dies and when the ram is up, said guard covers access to the space between the die parts, except for admission of a sheet metal piece to be worked on. Hence, the normal position of the guard is to have its lower edge a proper but safe distance from the upper plane of the female die part on the mach-ines bed. The

height of the lower section on the machine, is much less than that of the upper section of the guard, for the swinging of the lower section is to provide only the clearance necessary to remove the work when the operation is completcd. It is essential that the lower guard section shall be able to swing in front of the plane of the upper section, but not to a position in back of such plane to give an opening incompatible with the guards purpose. The guard is preferably light weight and it is most practical to have it of transparent plastic plate stock, for it is suspended fast to the upwardly-urged armatures of solenoids fixed on the frame of the machine; the scope of such upward movement when the solenoid coils are actuated, being sulficient to raise the guard to clear the work to allow unhindered upswing of the work portion which is in front of the dies. The circuit of the solenoids is controlled by a switch mounted on the machine frame and such switch is oper ated automatically .by the downward movement of the ram to actuate the solenoids to raise the guard immediately at or very slightly before the upper die touches the work. Of course, on the rams upward movement, said switch will return to the condition to open the solenoid circuit, whereupon the guard will fall to its normal lowered position. Said switch should be shielded or positioned that it be held from accidental operation.

For another embodiment, a cylinder apparatus may be used in place of the solenoid, in which instance the upper section of the safety guard is attached to the piston rod and said cylinder controlled by an electrically-operated valve; the mentioned circuit, controlling said valve.

Although I have shown a power brake in the illustrated embodiment, the association and operation of the safety apparatus herein taught, when incorporated on a power punch press or similar machine having a reciprocatable ram acting downwardly towards and upwardly from a fixed bed, are identical as herein set forth applied to the brake.

In the accompanying drawing forming part of this specification, similar characters of reference indicate corresponding parts in all the views.

FIG. 1 is a fragmentary front view of a power brake equipped with a safety guard embodying the teachings of this invention. Here, the machine is in normal rest condition. The ram is up. The safety guard is lowered with its sections co-planar. Movement thereof is effected by means of solenoids.

FIG. 2 is .a section drawn to an enlarged scale, taken at line 2-2 in FIG. 1 and shows .a metal sheet in position to be worked on.

FIG. 3 is a similar section taken at line 2-2 in FIG. 1, but here the machine is shown in condition where the bend in the work has just been completed by bringing the ram down. The safety guard has been automatically shifted .to permit the whip unmolested.

FIG. 4 is .a fragmentary front view where in plaee of each solenoid previously employed, there now is a cylinder means controlled by an electrically-openated Valve, to e fect lifting of the safety guard.

FIG. 5 is a diagrammatic showing of the electrical circuit which may be employed to operate the machine and its safety guard.

In the drawing, the numeral designates generally a power brake, but it may be a power punch press or similar machine, on whose frame 16, the ram 17 is slidably mounted for movement towards and then away from the machines bed 18. The ram carries the male die part 19 which cooperates with the female die part 20 on the bed, to make a bend 21 across a metal sheet 22, which may initially be laid on a table 23 with its forward edge against a properly positioned stop 24, to determine the position of the line of bend on the work. The balance of the machine structure is not shown because it is well known and forms no part of this invention. However, I have indicated the electrical circuit of the machines motor 25, because in the embodiment described, the solenoids 26 are actuated by the main power lines 27, though they may have. their own independent power supply as for instance from a storage battery not shown.

The safety guard indicated generally by the numeral 28, comprises two panel sections 29, 30 in a vertical plane, close to and in front of the dies 19, 20. Each such section is a horizontally positioned elongated member of plate stock, preferably of a transparent plastic sold under the trademark Lucite or Plexiglas. These sections are one atop the other and hinged at 31, so that the lower section 29 'can be swung only forwardly upwardly to allow removal of the finished work when the ram 17 returns to its normal raised position whereupon the guard 28 is again in its lowermost position. The upper section 30 is suspended fast by means of bolts 44 to plates 45 at the lower ends of the respective armatures 32 of the solenoids 26, which from a normal lowered position, are raised upon actuation of the solenoid coils, and they fall to such lowered position upon deactuation of said coils;

3 said coils being fixed to the machine frame and the scope of movement of said armatures being proper for the required safety guard movement.

In the set-up shown in FIG. 2, when the ram 17 is lowered to make the bend 21 as shown in FIG. 3, the forward part of the work 22 will swing upward. Such upward swing commences immediately after the upper die 19 contacts the fiat sheet. Hence, I have a normally open switch 33 fixed on the frame of the machine at a position that its spring biased operating member 33' is moved to close the switch by a cam piece 34 fixed on the ram, when the ram has reached such position that the die 19 just has come into contact with the sheet 22, or even a bit before such contact occurs, thereby actuating the solenoids 26 and the guard 28 is quickly lifted as shown in FIG. 3 at the start of bending the work. Said cam holds the switch closed until the ram has moved upward on its return stroke where the operating member 33' is free and so the switch 33 is thereupon opened, causing the deactuation of the solenoids 26 and hence the guard 28 falls to its normal low position as shown in FIG. 2. When the ram is raised it stops. For example, the machine is equipped with a pedal-operated one-revolution clutch suitably interposed to eifect one cycle of ram movement for each manual operation of the clutch. This arrangement is not shown, because it is well known and is no part of this invention.

One electrical circuit arrangement applicable herein is shown in FIG. 4, where the machines motor and the solenoids 26 receive their power from the lines 27. A switch 35 is interposed in one of said lines to connect and disconnect the power, and the switch 33 is interposed to control the application of power to said solenoids. For a more particular description of the circuit illustrated, it is noted that one terminal of the switch 35 is connected to one of the power lines; the other terminal of such switch being connected to one of the terminals of the solenoids and the motor. The other terminals of the solenoids are connected to one of the terminals of the switch 33; the other power line being connected to the motor and the other terminal of the switch 33.

To set the machine for operation, the switch 35 is closed to run the motor. At every operation of the press as determined by the working of the one-revolution clutch mentioned; the switch 33 will be operated as determined by the position of the ram, to cause the movement of the guard 28, in the manner herebefore set forth.

In place of each solenoid 26, I may substitute a suitable cylinder apparatus 36, whose piston rod 37 is attached to the safety guards upper section and whose I electrically-operated control valve 38 is likewise mounted on the supporting bar or beam 39. The solenoid 40, operating the valve 38, now takes the place of a solenoid 26 in the circuit shown in FIG. 5, and operation of the machine is otherwise the same as set forth previously herein. Said cylinder apparatus is preferably operated by compressed air, but may be of the steam or hydraulic types. The term cylinder apparatus herein shall be deemed to include all such media for cylinder operation.

It is advisable to be able to adjust the initial position of the guard. For this purpose the bar 39 may have its position adjusted up or down along the vertical leg of an angle piece as 41 at each end of the machines frame, and frontward and rearward, by adjusting the position of the angle pieces 41 along the horizontal leg of the fixed angle pieces as 42. The switch 33 may be at the rear of the machine on a bar 43.

This invention is capable of numerous forms and various applications without departing from the essential features herein disclosed. .It is therefore intended and desired that the embodiments shown herein shall be deemed illustrative and not restrictive and that the patent shall cover all patentable novelty herein set forth; reference being had to the following claims rather than to the specific description herein to indicate the scope of this invention.

I claim:

1. In combination with a machine having a die part fixed on a ram which is movable on the machines frame, downwardly towards and upwardly from a co-operating die part fixed on a fixed bed, a normally upright panel structure safety guard positioned in front of said die parts and extending sufiiciently downward to permit the admission of a metal sheet under said safety guard and thence between said die parts, but to exclude the admission of an operators finger to the die parts when the sheet is out of the machine; said safety guard comprising two sections, one above the other and in hinged relation so that the lower section can be swung only upwardly and forwardly from its normal position and then downwardly rearwardly back to such normal position, a first means including an electrically operated device, and a member movably mounted in relation to the frame, which member is moved in one direction when said device is actuated and in the opposite direction when said device is deactuated, a second means connecting the said member with the upper section of the safety guard, whereby on actuation of said device, the safety guard will be raised and upon deactuation of said device, the safety guard will return to its normal lowered position, an electrical circuit to actuate said device, a switch interposed in said circuit to control the actuation of said device; said switch being fixed on the frame and normally in open condition and an element carried on the ram, adapted to close said switch when the ram is at a predetermined lowered position.

2. An apparatus as defined in claim 1, wherein the switch has a spring-biased operating member; the element on the ram being a cam which is adapted to shift said operating member to bring the switch into closed condition.

3. An apparatus as defined in claim 1, wherein said element is so positioned on the ram and said switch is so positioned on the frame that the lowered position of the ram whereat the switch will be closed, is when the distance between the bottom plane of the upper die and the top plane of the lower die, is about the thickness of the metal to be worked.

4. An apparatus as defined in claim 1, wherein the first means is a solenoid and the armature thereof is the mentioned member; the coil of said solenoid, being the electrically-operated device.

5. An apparatus as defined in claim 1, wherein the first means is a cylinder apparatus and the piston rod thereof is the mentioned member; said cylinder being controlled by an electrically operated valve which is the electricallyoperated device.

References Cited by the Examiner UNITED STATES PATENTS 2,724,287 11/55 Knoth 74-615 X FOREIGN PATENTS 781,722 8/57 Great Britain.

BROUGHTON G. DURHAM, Primary Examiner. MILTON KAUFMAN. Examiner.

Claims (1)

1. IN COMBINATION WITH A MACHINE HAVING A DIE PART FIXED ON A RAM WHICH IS MOVABLE ON THE MACHINE''S FRAME, DOWNWARDLY TOWARDS AND UPWARDLY FROM A CO-OPERATING DIE PART FIXED ON A FIXED BED, A NORMALLY UPRIGHT PANEL STRUCTURE SAFETY GUARD POSITIONED IN FRONT OF SAID DIE PARTS AND EXTENDING SUFFICIENTLY DOWNWARD TO PERMIT THE ADMISSION OF A METAL SHEET UNDER SAID SAFETY GUARD AND THENCE BETWEEN SAID DIE PARTS, BUT TO EXCLUDE THE ADMISSION OF AN OPERATOR''S FINGER TO THE DIE PARTS WHEN THE SHEET IS OUT OF THE MACHINE; SAID SAFETY GUARD COMPRISING TWO SECTIONS, ONE ABOVE THE OTHER AND IN HINGED RELATION SO THAT THE LOWER SECTION CAN BE SWUNG ONLY UPWARDLY AND FORWARDLY FROM ITS NORMAL POSITION AND THEN DOWNWARDLY REARWARDLY BACK TO SUCH NORMAL POSITION, A FIRST MEANS INCLUDING AN ELECTRICALLY OPERATED DEVICE, AND A MEMBER MOVABLY MOUNTED IN RELATION TO THE FRAME, WHICH MEMBER IS MOVED IN ONE DIRECTION WHEN SAID DEVICE IS ACTUATED AND IN THE OPPOSITE DIRECTION WHEN SAID DEVICE IS DEACTUATED, A SECOND MEANS CONNECTING THE SAID MEMBER WITH THE UPPER SECTION OF THE SAFETY GUARD, WHEREBY ON ACTUATION OF SAID DEVICE, THE SAFETY GUARD WILL BE RAISED AND UPON DEACTUATION OF SAID DEVICE, THE SAFETY GUARD WILL RETURN TO ITS NORMAL LOWERED POSITION, AN ELECTRICAL CIRCUIT TO ACTUATE SAID DEVICE, A SWITCH INTERPOSED IN SAID CIRCUIT TO CONTROL THE ACTUATION OF SAID DEVICE; SAID SWITCH BEING FIXED ON THE FRAME AND NORMALLY IN OPEN CONDITION AND AN ELEMENT CARRIED ON THE RAM, ADAPTED TO CLOSE SAID SWITCH WHEN THE RAM IS AT A PREDETERMINED LOWERED POSITION.
US3186256A 1963-07-22 1963-07-22 Safety guards for brakes, punch presses and similar machines Expired - Lifetime US3186256A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US3186256A US3186256A (en) 1963-07-22 1963-07-22 Safety guards for brakes, punch presses and similar machines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3186256A US3186256A (en) 1963-07-22 1963-07-22 Safety guards for brakes, punch presses and similar machines

Publications (1)

Publication Number Publication Date
US3186256A true US3186256A (en) 1965-06-01

Family

ID=23147529

Family Applications (1)

Application Number Title Priority Date Filing Date
US3186256A Expired - Lifetime US3186256A (en) 1963-07-22 1963-07-22 Safety guards for brakes, punch presses and similar machines

Country Status (1)

Country Link
US (1) US3186256A (en)

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3641841A (en) * 1969-03-24 1972-02-15 Masahiro Komori Safety gate for press
US3969955A (en) * 1975-08-14 1976-07-20 H C Products Co. Press brake safety device
US4080846A (en) * 1977-03-03 1978-03-28 Glentworth Manufacturing Inc. Machinery guard
US4137795A (en) * 1977-06-22 1979-02-06 Lindquist J Theodore Safety guard for power presses
US4220032A (en) * 1978-12-15 1980-09-02 Air Conditioning Corporation Power press break guard
US4527684A (en) * 1982-12-20 1985-07-09 Fort Wayne Truck Parts & Equipment, Inc. Ram supported sensing shield for power presses
US5400677A (en) * 1993-11-02 1995-03-28 Excelsior Process And Engraving, Inc. Shield for engraving machines
US5560290A (en) * 1994-01-28 1996-10-01 Kaneko; Keiko Safety apparatus in power press machine
US5560466A (en) * 1995-03-31 1996-10-01 The Whitaker Corporation Safety guard system for machine having a ram
US6338192B1 (en) * 1998-09-25 2002-01-15 Matsushita Electric Industrial Co., Ltd. Component mounting machine and safety device thereof
US20040000491A1 (en) * 2002-06-28 2004-01-01 Applied Materials, Inc. Electroplating cell with copper acid correction module for substrate interconnect formation
US6745645B2 (en) 2002-02-27 2004-06-08 Smith International, Inc. Enhanced gage protection for milled tooth rock bits
US6813983B2 (en) 2000-09-29 2004-11-09 Sd3, Llc Power saw with improved safety system
US20040237617A1 (en) * 2001-08-17 2004-12-02 Gerhard Sperrer Production device, in particular a folding press and a method for operating a production device
US6826988B2 (en) 2000-09-29 2004-12-07 Sd3, Llc Miter saw with improved safety system
US6827074B2 (en) 2002-05-24 2004-12-07 Datigen.Com, Inc. Method and apparatus for removing trip hazards in concrete sidewalks
US6880440B2 (en) 2000-09-29 2005-04-19 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
US7000514B2 (en) 2001-07-27 2006-02-21 Sd3, Llc Safety systems for band saws
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
US7377199B2 (en) 2000-09-29 2008-05-27 Sd3, Llc Contact detection system for 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
US7832314B2 (en) 2000-08-14 2010-11-16 Sd3, Llc Brake positioning system
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
US8100039B2 (en) 2000-08-14 2012-01-24 Sd3, Llc Miter saw with safety system
US8459157B2 (en) 2003-12-31 2013-06-11 Sd3, Llc Brake cartridges and mounting systems for brake cartridges
US9927796B2 (en) 2001-05-17 2018-03-27 Sawstop Holding Llc Band saw with improved safety system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2724287A (en) * 1955-11-22 knoth
GB781722A (en) * 1952-12-30 1957-08-21 Ind Guarding Equipment Ltd Improvements relating to guards for bending machines, press brakes and like machinesused for bending sheet metal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2724287A (en) * 1955-11-22 knoth
GB781722A (en) * 1952-12-30 1957-08-21 Ind Guarding Equipment Ltd Improvements relating to guards for bending machines, press brakes and like machinesused for bending sheet metal

Cited By (64)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3641841A (en) * 1969-03-24 1972-02-15 Masahiro Komori Safety gate for press
US3969955A (en) * 1975-08-14 1976-07-20 H C Products Co. Press brake safety device
US4080846A (en) * 1977-03-03 1978-03-28 Glentworth Manufacturing Inc. Machinery guard
US4137795A (en) * 1977-06-22 1979-02-06 Lindquist J Theodore Safety guard for power presses
US4220032A (en) * 1978-12-15 1980-09-02 Air Conditioning Corporation Power press break guard
US4527684A (en) * 1982-12-20 1985-07-09 Fort Wayne Truck Parts & Equipment, Inc. Ram supported sensing shield for power presses
US5400677A (en) * 1993-11-02 1995-03-28 Excelsior Process And Engraving, Inc. Shield for engraving machines
US5560290A (en) * 1994-01-28 1996-10-01 Kaneko; Keiko Safety apparatus in power press machine
US5560466A (en) * 1995-03-31 1996-10-01 The Whitaker Corporation Safety guard system for machine having a ram
US6338192B1 (en) * 1998-09-25 2002-01-15 Matsushita Electric Industrial Co., Ltd. Component mounting machine and safety device thereof
US6490781B2 (en) 1998-09-25 2002-12-10 Matsushita Electric Industrial Co., Ltd. Component mounting machine and safety device thereof
US9925683B2 (en) 1999-10-01 2018-03-27 Sawstop Holding Llc Table saws
US9522476B2 (en) 1999-10-01 2016-12-20 Sd3, Llc Power equipment with detection and reaction systems
US7788999B2 (en) 1999-10-01 2010-09-07 Sd3, Llc Brake mechanism for power equipment
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
US7895927B2 (en) 1999-10-01 2011-03-01 Sd3, Llc Power equipment with detection and reaction systems
US8151675B2 (en) 2000-08-14 2012-04-10 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
US6957601B2 (en) * 2000-08-14 2005-10-25 Sd3, Llc Translation stop for use in power equipment
US7681479B2 (en) 2000-08-14 2010-03-23 Sd3, Llc Motion detecting system for use in a safety system for power equipment
US8100039B2 (en) 2000-08-14 2012-01-24 Sd3, Llc Miter saw with safety system
US7921754B2 (en) 2000-08-14 2011-04-12 Sd3, Llc Logic control for fast-acting safety system
US9038515B2 (en) 2000-08-14 2015-05-26 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
US7610836B2 (en) 2000-08-14 2009-11-03 Sd3, Llc Replaceable brake mechanism for power equipment
US7832314B2 (en) 2000-08-14 2010-11-16 Sd3, Llc Brake positioning 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
US8186255B2 (en) 2000-09-29 2012-05-29 Sd3, Llc Contact detection system for power equipment
US6994004B2 (en) 2000-09-29 2006-02-07 Sd3, Llc Table saw with improved safety system
US6880440B2 (en) 2000-09-29 2005-04-19 Sd3, Llc Miter saw with improved safety system
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
US6945148B2 (en) 2000-09-29 2005-09-20 Sd3, Llc Miter saw with improved safety system
US9927796B2 (en) 2001-05-17 2018-03-27 Sawstop Holding Llc Band saw with improved safety system
US7712403B2 (en) 2001-07-03 2010-05-11 Sd3, Llc Actuators for use in fast-acting safety systems
US7000514B2 (en) 2001-07-27 2006-02-21 Sd3, Llc Safety systems for band saws
US7281403B2 (en) * 2001-08-17 2007-10-16 Trumpf Maschinen Austria Gmbh & Co. Kg Production device, in particular a folding press and a method for operating a production device
US20040237617A1 (en) * 2001-08-17 2004-12-02 Gerhard Sperrer Production device, in particular a folding press and a method for operating a production device
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
US6745645B2 (en) 2002-02-27 2004-06-08 Smith International, Inc. Enhanced gage protection for milled tooth rock bits
US7201644B2 (en) 2002-05-24 2007-04-10 Precision Concrete Cutting, Inc. Apparatus for removing trip hazards in concrete sidewalks
US6827074B2 (en) 2002-05-24 2004-12-07 Datigen.Com, Inc. Method and apparatus for removing trip hazards in concrete sidewalks
US7143760B2 (en) 2002-05-24 2006-12-05 Precision Concrete Cutting, Inc. Method for removing trip hazards in concrete sidewalks
US20060141917A1 (en) * 2002-05-24 2006-06-29 Gardner M B Method for removing trip hazards in concrete sidewalks
US20060246827A1 (en) * 2002-05-24 2006-11-02 Gardner M B Apparatus for removing trip hazards in concrete sidewalks
US20040000491A1 (en) * 2002-06-28 2004-01-01 Applied Materials, Inc. Electroplating cell with copper acid correction module for substrate interconnect formation
US7836804B2 (en) 2003-08-20 2010-11-23 Sd3, Llc Woodworking machines with overmolded arbors
US7827893B2 (en) 2003-12-31 2010-11-09 Sd3, Llc Elevation mechanism for table saws
US8122807B2 (en) 2003-12-31 2012-02-28 Sd3, Llc Table saws with safety systems
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
US8498732B2 (en) 2003-12-31 2013-07-30 Sd3, Llc Detection systems for power equipment
US9623498B2 (en) 2003-12-31 2017-04-18 Sd3, Llc Table saws
US8087438B2 (en) 2003-12-31 2012-01-03 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
US7707920B2 (en) 2003-12-31 2010-05-04 Sd3, Llc Table saws with safety systems
US8505424B2 (en) 2004-01-29 2013-08-13 Sd3, Llc Table saws with safety systems and systems to mount and index attachments
US7827890B2 (en) 2004-01-29 2010-11-09 Sd3, Llc Table saws with safety systems and systems to mount and index attachments

Similar Documents

Publication Publication Date Title
US3834213A (en) Workpiece translation mechanism for transfer die press
US2163967A (en) Cut-off machine
US2558071A (en) Electrohydraulic control means for machines employing plural hydraulic motors
US1456079A (en) Method and mechanism for continuously producing and setting rivets
US2241556A (en) Photoelectrically controlled press
US2287833A (en) Cutoff machine
US2343167A (en) Press leveling means
US3299689A (en) Method and apparatus for combined stretch forming and die drawing
US2113115A (en) Hydromechanical press
US3225686A (en) Press with sliding bolster and die clamp
US4391358A (en) Hardware press and punch apparatus
US3841140A (en) Control system for press brakes and the like
US2306223A (en) Automatic tube bending machine
US3204506A (en) Die cutting press having hydraulic means to move the upper platen transversely of the work support
US2677342A (en) Work removing apparatus
US1241257A (en) Metal-working machine.
US2317440A (en) Press
US3942431A (en) Press having travelling die set
US3827328A (en) Control system for hydraulic presses
US3668919A (en) Combination hydraulic shearing and pressbrake machine
US4235089A (en) Progressive stamping press
US4527684A (en) Ram supported sensing shield for power presses
US4369907A (en) Punching and riveting machine
US2072694A (en) Belly press
US2128152A (en) Auxiliary hydraulic device for presses