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US3731573A - Safety guard for fabricating apparatus - Google Patents

Safety guard for fabricating apparatus Download PDF

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Publication number
US3731573A
US3731573A US3731573DA US3731573A US 3731573 A US3731573 A US 3731573A US 3731573D A US3731573D A US 3731573DA US 3731573 A US3731573 A US 3731573A
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Prior art keywords
block
tool
space
accordance
aperture
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E Jahnke
R Miller
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P1/00—Safety devices independent of the control and operation of any machine
    • F16P1/02—Fixed screens or hoods
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/219—Guards
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2193—Guard mechanisms
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/606—Interrelated tool actuating means and guard means
    • Y10T83/613—Work guard
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/869—Means to drive or to guide tool
    • Y10T83/872—With guard means

Definitions

  • Int Cl B26d 5/08 guard comprises a block of sponge rubber or other 58 d 612 615' resilient material which substantially occupies the 1 0 F l space and within which the tool and die elements are 51/26 100/53 83/544 contained.
  • the block is suitably apertured so that v 545 work may be passed through the space and the space is completely enclosed to prevent access by the opera- [56]
  • Field of the Invention pertains to safety guards of the type used in fabricating apparatus such as power presses which contain tool and die mechanisms.
  • guards Some if improperly adjusted create unsafe conditions and fence type guards must of necessity be placed a distance from the working space creating problems for the operator which generally prompts him to remove the guard. Such guards also have little flexibility and must be rebuilt or newly constructed for different jobs. They are cumbersome and expensive and for this reason are generally removed by the operator in violation of the safety rules of his employer.
  • the present'invention is inexpensive, simple in construction and installation and is foolproof since it completely prevents an operator from reaching into the die space of a power press during the operation. It comprises a block of resilient material placed between the tool and die plates which define the working space. The block contains apertures interiorly thereof which provide for clearance of the tool and die function and yet the space is completely closed. During closure of the tool and die plates the block merely bulges and is com pressed, returning to its normal shape after each stroke of the press.
  • FIG. 1 is an isometric view of a power press including the improved safety guard of this invention
  • FIG. 2 is a front elevational view of a ram and plate and platen assembly of a power press disclosing a safety guard enclosing the space within which a punch and die arrangement is provided;
  • FIG. 3 is a cross-sectional view through the assembly disclosed in FIG. 2;
  • a power press 10 includes a base 11 which is normally supported on or below a concrete floor.
  • the base 11 carries a base plate or platen 12.
  • An upper slide structure 13 is supported by the base and includes a ram structure 14 which is reciprocated vertically by a suitable actuating mechanism including a fly wheel, gearing, etc. (not shown).
  • a top plate 15 is suitably secured to the ram structure 14, and a tool holder block or plate 16 is suitably secured to the top plate 15.
  • a cut-off punch (tool) 17 is connected to and pro jects downwardly from the tool holder 16.
  • perforating punches 18, 19, 20 are connected to the holder 16.
  • a die member 21 is connected to the platen 12 and includes bores 22, 23, 24 and 25, which communicate with scrap discharge openings 26 provided in the platen 12.
  • Clamp members 27 of conventional construction secure the die member 21 to the platen 12.
  • the bores 22 through 25 are provided at their upper 'ends with cutting edges which are conventionally engaged and mated with the tools or punches 17 through 20 to perforate or operate on a work piece.
  • a safety guard is generally designated at 28 and comprises a block or cube 29 of a material such as foam rubber, neoprene, urethane, vinyl, polyethelene, silicon, or suitable other materials having the quality of resiliency.
  • the material is not limited to any one type and any material having strength to return to its original shape and which forms a block containing walls enclosing the space can be used. It is of course required that it return to its original shape after compression, and it is preferred thatait is of an absorbent characteristic.
  • the block 29 includes a front wall 30, rear wall 31, side walls 32, a top wall 33, and bottom walls 34.
  • the die plate or member 21 also includes a conventional stripper plate 36 belowwhich strip stock orwork' 37 is supported as it moves through the space provided by the plates 12, 15 and 16.
  • the block 29 includes a passage 38 which emerges in side walls 32 for the passage of the strip stock 37.
  • the block 29 is also provided with recesses 39 to accommodate the clamps 27.
  • the block 29 is further provided with apertures 40, 41, 42 and 43 within which the punches or tool members 17, 1 8, 19 and 20 are positioned.
  • walls'45, 46, 47 and 48 are positioned in rectangular relationship and are interconnected by suitable doublesided pressure-sensitive adhesive strips 49.
  • the aperture 50 accommodates the tool and die parts andsuitable apertures may be made in the wallsto provide for the stock strip.
  • a conventional oil reservoir is mounted on the plate 15 and directs lubricant through a plastic tube 52 into the block.
  • the tube 52 may lie in a bore 53 and may have a plurality of discharge ports 54 which spray lubricant against the tools and throughout the absorbent block.
  • the present invention provides for the greatest simplicity of operation and installation.
  • the block 29 is readily formed from conventional material sizes to the size desired for the particular opening. Or, it may be constructed from narrower strips of material as shown in FIG. 6. In the manner of use shown the block 29 extends from the plate 12 upwardly against the tool holder 16 and thus vertical dimension of the space and dimension of the vertical dimension of the block are equal.
  • the block could also be high and wide enough to cover the tool holder 16 if desired.
  • the die space to be enclosed is determined from the nature and construction of the arrangement in order to receive maximum safety enclosure and yet secure an efficient arrangement for operation.
  • the apertures for the tools such as in perforators, may be cut by placing the block in position and lowering the ram, the perforators thereby cutting out their own clearance apertures.
  • the openings for stock clearance, etc. can be cut prior to this operation, but thereafter the guard is in position and the unit is ready for conventional operation.
  • the ram descends the tools move through openings in the stripper plate, cut through the stock, enter the bores which have sharp cutting edges at their upper ends, and the scrap is discharged through the holes 26, as the ram again moves upwardly.
  • the block is compressed and bulges outwardly as the ram descends and this clearly would force an operators hands outwardly would he desire to insert his hands which is unlikely in view of the complete barrier created by the block.
  • the block always returns to its original shape and position.
  • the advantages of this invention further lie in the complete safety barrier which is provided.
  • the noise of the punching operation is greatly diminished since the foam rubber block retains the noise in an accoustic sense. Special mounting, necessary in the prior art units, is not required.
  • the lubrication is expedited and yet is retained in the block thus causing less danger due to lubrication drippings on the floor.
  • the foam material absorbs lubricant from the oiler on the up stroke of the ram and releases it on the down stroke internally thus avoiding the mess provided by spray and-brush type of lubricants.
  • a safety guard for protecting the operator during the operation of fabricating apparatus having a tool holding member and a platen member positioned relatively apart to provide a space therebetween, a tool supported on said tool holding member and projecting into said space, a work holder on said platen, and means for moving one of said members toward the other whereby said space is diminished and said tool is moved into engagement with work supported on said work holder;
  • a guard member including a member of resilient compressible material having a solid wall construc tion
  • said member beinG supported within said space with said wall construction enclosing substantially at least one side of said space to prevent access thereto by the operator, and
  • said member comprising a block being relatively solid and said resilient material being of a rubberlike material adapted to return to its original shape after compression.
  • said block including at least one aperture containing said tool, and a second aperture in said block through which work may be moved, said aperture being in communication with one another.
  • said block having a cube shape and said wall construction including four walls enclosing said space on all sides thereof.
  • said space having a certain dimension between said tool holding member and said platen member in an open position, said block contained within said space having a substantially equal dimension before said members are relatively moved to a closed position and said block is compressed.
  • a lubricating tube embedded within said block and including orifices for directing lubricant to a tool enclosed by said block.
  • said block having at least one opening contained therein within which said tool is disposed.
  • lubricating means connected to said block for providing a lubricant to the interior thereof.
  • said block also comprising a material of absorbent qualities and including lubricating means 'for directing lubricant to said block to be absorbed thereby.
  • said lubricating nieans including an oil reservoir carried by said apparatus
  • said block having at least one tool containing aperture

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

A safety guard for a power press is provided, the press including a conventional ram and upper and lower plates defining a tool and die containing space. The guard comprises a block of sponge rubber or other resilient material which substantially occupies the space and within which the tool and die elements are contained. The block is suitably apertured so that work may be passed through the space and the space is completely enclosed to prevent access by the operator.

Description

U United States Patent 1 1 1111 3,731,573
Jahnke et al. 1 May 8, 1973 541 SAFETY GUARD FOR FABRICATING 2,350,247 5 1944 Newell ..74/6l2 APPARATUS 1,387,553 8 1921 Miller ..83/544'X l A A,, 1,351,116. 8/1920 Morse ..83/544 [76] Inventors: Earl M. Jahnke, 138 Berkley Ave-, 391,558 10/1888 Richardson ..83/397 nue, Elmhurst, Ill. 60126; Robert Miller, 63 W. 73rd St., Darien, 111. Primary ExaminerAndrew R. Juhasz 60559 Assistant Examiner-W. D. Bray {22] Filed Feb 22 1952 r Att0rney-Hilmond O.Voge1 21 Appl. No.: 227,912 1571 ABSTRACT A safety guard for a power press is provided, the press 52 U.S.Cl. ..83/544, 74/608, 83/397.l, inchdmg afonvemimal and W and 100/53 74/612 plates definmg a tool and d1e contammg space. The [51] Int Cl B26d 5/08 guard comprises a block of sponge rubber or other 58 d 612 615' resilient material which substantially occupies the 1 0 F l space and within which the tool and die elements are 51/26 100/53 83/544 contained. The block is suitably apertured so that v 545 work may be passed through the space and the space is completely enclosed to prevent access by the opera- [56] References Clted ton i UNITED STATES PATENTS 10 Claims, 7 Drawing Figures 2,683,515 7/1954 Horn et al .i.74/61SX SAFETY GUARD FOR FABRICATING APPARATUS BACKGROUND OF THE INVENTION 1. Field of the Invention The field of invention pertains to safety guards of the type used in fabricating apparatus such as power presses which contain tool and die mechanisms.
2. Description of the Prior Art The prior art is replete with safety guards which are used to confine the safety of a power press within which tool and die elements are positioned. Such arrangements are shown in US. Pat. Nos. 1,256,641, 2,714,926 and 3,293,941 which are familiarly known as fence type guards. These may be screens, perforated metal, or vertical adjustable parallel rods, and are of course all employed to limit or prevent operator access to the working space of the power press which can be very dangerous due to the closure of the press ram and plate tool holder relative to the die plate and platen in an inadvertent manner. Such guards create a safety hazard of their own. Some if improperly adjusted create unsafe conditions and fence type guards must of necessity be placed a distance from the working space creating problems for the operator which generally prompts him to remove the guard. Such guards also have little flexibility and must be rebuilt or newly constructed for different jobs. They are cumbersome and expensive and for this reason are generally removed by the operator in violation of the safety rules of his employer.
Other types of guards having these problems are disclosed in US. Pat. Nos. 2,089,938, 2,141,027,
SUMMARY- It is the prime objective of this invention to provide an improved safety guard for enclosing the tool and die area in a power press to discourage and prevent access by the operator during operation.
The present'invention is inexpensive, simple in construction and installation and is foolproof since it completely prevents an operator from reaching into the die space of a power press during the operation. It comprises a block of resilient material placed between the tool and die plates which define the working space. The block contains apertures interiorly thereof which provide for clearance of the tool and die function and yet the space is completely closed. During closure of the tool and die plates the block merely bulges and is com pressed, returning to its normal shape after each stroke of the press.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an isometric view of a power press including the improved safety guard of this invention;
FIG. 2 is a front elevational view of a ram and plate and platen assembly of a power press disclosing a safety guard enclosing the space within which a punch and die arrangement is provided;
FIG. 3 is a cross-sectional view through the assembly disclosed in FIG. 2;
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to FIG. 1, a power press 10 includes a base 11 which is normally supported on or below a concrete floor. The base 11 carries a base plate or platen 12. An upper slide structure 13 is supported by the base and includes a ram structure 14 which is reciprocated vertically by a suitable actuating mechanism including a fly wheel, gearing, etc. (not shown). A top plate 15 is suitably secured to the ram structure 14, and a tool holder block or plate 16 is suitably secured to the top plate 15.
A cut-off punch (tool) 17 is connected to and pro jects downwardly from the tool holder 16. Similarly perforating punches 18, 19, 20 are connected to the holder 16. A die member 21 is connected to the platen 12 and includes bores 22, 23, 24 and 25, which communicate with scrap discharge openings 26 provided in the platen 12. Clamp members 27 of conventional construction secure the die member 21 to the platen 12. The bores 22 through 25 are provided at their upper 'ends with cutting edges which are conventionally engaged and mated with the tools or punches 17 through 20 to perforate or operate on a work piece.
A safety guard is generally designated at 28 and comprises a block or cube 29 of a material such as foam rubber, neoprene, urethane, vinyl, polyethelene, silicon, or suitable other materials having the quality of resiliency. The material is not limited to any one type and any material having strength to return to its original shape and which forms a block containing walls enclosing the space can be used. It is of course required that it return to its original shape after compression, and it is preferred thatait is of an absorbent characteristic. v i
The block 29 includes a front wall 30, rear wall 31, side walls 32, a top wall 33, and bottom walls 34.
The die plate or member 21 also includes a conventional stripper plate 36 belowwhich strip stock orwork' 37 is supported as it moves through the space provided by the plates 12, 15 and 16. The block 29 includes a passage 38 which emerges in side walls 32 for the passage of the strip stock 37.
The block 29 is also provided with recesses 39 to accommodate the clamps 27. The block 29 is further provided with apertures 40, 41, 42 and 43 within which the punches or tool members 17, 1 8, 19 and 20 are positioned.
In the modification of the block 29 disclosed in FIG. 6, walls'45, 46, 47 and 48 are positioned in rectangular relationship and are interconnected by suitable doublesided pressure-sensitive adhesive strips 49. In this case the aperture 50 accommodates the tool and die parts andsuitable apertures may be made in the wallsto provide for the stock strip.
A conventional oil reservoir is mounted on the plate 15 and directs lubricant through a plastic tube 52 into the block. The tube 52 may lie in a bore 53 and may have a plurality of discharge ports 54 which spray lubricant against the tools and throughout the absorbent block.
THE OPERATION The present invention provides for the greatest simplicity of operation and installation. The block 29 is readily formed from conventional material sizes to the size desired for the particular opening. Or, it may be constructed from narrower strips of material as shown in FIG. 6. In the manner of use shown the block 29 extends from the plate 12 upwardly against the tool holder 16 and thus vertical dimension of the space and dimension of the vertical dimension of the block are equal.
However, the block could also be high and wide enough to cover the tool holder 16 if desired. The die space to be enclosed is determined from the nature and construction of the arrangement in order to receive maximum safety enclosure and yet secure an efficient arrangement for operation. In most arrangements the apertures for the tools, such as in perforators, may be cut by placing the block in position and lowering the ram, the perforators thereby cutting out their own clearance apertures. The openings for stock clearance, etc. can be cut prior to this operation, but thereafter the guard is in position and the unit is ready for conventional operation. As the ram descends the tools move through openings in the stripper plate, cut through the stock, enter the bores which have sharp cutting edges at their upper ends, and the scrap is discharged through the holes 26, as the ram again moves upwardly. As shown in FIG. 4, the block is compressed and bulges outwardly as the ram descends and this clearly would force an operators hands outwardly would he desire to insert his hands which is unlikely in view of the complete barrier created by the block. The block always returns to its original shape and position.
The advantages of this invention further lie in the complete safety barrier which is provided. The noise of the punching operation is greatly diminished since the foam rubber block retains the noise in an accoustic sense. Special mounting, necessary in the prior art units, is not required. The lubrication is expedited and yet is retained in the block thus causing less danger due to lubrication drippings on the floor. The foam material absorbs lubricant from the oiler on the up stroke of the ram and releases it on the down stroke internally thus avoiding the mess provided by spray and-brush type of lubricants.
Thus it is believed that the objective of the invention has been fully achieved by the arrangement fully disclosed hereinabove.
What is claimed is:
l. A safety guard for protecting the operator during the operation of fabricating apparatus having a tool holding member and a platen member positioned relatively apart to provide a space therebetween, a tool supported on said tool holding member and projecting into said space, a work holder on said platen, and means for moving one of said members toward the other whereby said space is diminished and said tool is moved into engagement with work supported on said work holder; comprising H .a guard member including a member of resilient compressible material having a solid wall construc tion,
said member beinG supported within said space with said wall construction enclosing substantially at least one side of said space to prevent access thereto by the operator, and
said member beind compressed during movement of one of said members toward the other.
2. The invention in accoreance with claim 1,
said member comprising a block being relatively solid and said resilient material being of a rubberlike material adapted to return to its original shape after compression.
3. The invention in accordance with claim 2,
' said block including at least one aperture containing said tool, and a second aperture in said block through which work may be moved, said aperture being in communication with one another.
4. The invention in accordance with claim 2,
said block having a cube shape and said wall construction including four walls enclosing said space on all sides thereof.
5. The invention in accordance with claim 2,
said space having a certain dimension between said tool holding member and said platen member in an open position, said block contained within said space having a substantially equal dimension before said members are relatively moved to a closed position and said block is compressed.
6. The invention in accordance with claim 1,
including a lubricating tube embedded within said block and including orifices for directing lubricant to a tool enclosed by said block.
7. The invention in accordance with claim 2,
said block having at least one opening contained therein within which said tool is disposed.
8. The invention in accordance with claim 7,
including lubricating means connected to said block for providing a lubricant to the interior thereof.
9. The invention in accordance with claim 2,
said block also comprising a material of absorbent qualities and including lubricating means 'for directing lubricant to said block to be absorbed thereby.
10. The invention in accordance with claim 9,
said lubricating nieans including an oil reservoir carried by said apparatus,
a flexible tube communicating with said reservoir and said block, I
said block having at least one tool containing aperture, and
means on said tube directing lubricant to said block and aperture for providing lubricant against said tool.
* i I! l 1:

Claims (10)

1. A safety guard for protecting the operator during the operation of fabricating apparatus having a tool holding member and a platen member positioned relatively apart to provide a space therebetween, a tool supported on said tool holding member and projecting into said space, a work holder on said platen, and means for moving one of said members toward the other whereby said space is diminished and said tool is moved into engagement with work supported on said work holder; comprising a guard member including a member of resilient compressible material having a solid wall construction, said member beinG supported within said space with said wall construction enclosing substantially at least one side of said space to prevent access thereto by the operator, and said member beind compressed during movement of one of said members toward the other.
2. The invention in accoreance with claim 1, said member comprising a block being relatively solid and said resilient material being of a rubber-like material adapted to return to its original shape after compression.
3. The invention in accordance with claim 2, said block including at least one aperture containing said tool, and a second aperture in said block through which work may be moved, said aperture being in communication with one another.
4. The invention in accordance with claim 2, said block having a cube shape and said wall construction including four walls enclosing said space on all sides thereof.
5. The invention in accordance with claim 2, said space having a certain dimension between said tool holding member and said platen member in an open position, said block contained within said space having a substantially equal dimension before said members are relatively moved to a closed position and said block is compressed.
6. The invention in accordance with claim 1, including a lubricating tube embedded within said block and including orifices for directing lubricant to a tool enclosed by sAid block.
7. The invention in accordance with claim 2, said block having at least one opening contained therein within which said tool is disposed.
8. The invention in accordance with claim 7, including lubricating means connected to said block for providing a lubricant to the interior thereof.
9. The invention in accordance with claim 2, said block also comprising a material of absorbent qualities and including lubricating means for directing lubricant to said block to be absorbed thereby.
10. The invention in accordance with claim 9, said lubricating means including an oil reservoir carried by said apparatus, a flexible tube communicating with said reservoir and said block, said block having at least one tool containing aperture, and means on said tube directing lubricant to said block and aperture for providing lubricant against said tool.
US3731573D 1972-02-22 1972-02-22 Safety guard for fabricating apparatus Expired - Lifetime US3731573A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6089148A (en) * 1999-06-07 2000-07-18 Bloomer; Thomas J Fixed stroke power press safety stop block

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US391558A (en) * 1888-10-23 Assegnqe op one
US1351116A (en) * 1920-08-31 morse
US1387553A (en) * 1920-02-28 1921-08-16 Miller Herman Protective guard for the tools of cutting and punching machines, &c.
US2350247A (en) * 1942-11-13 1944-05-30 Arthur Morris Machinery guard
US2683515A (en) * 1949-02-18 1954-07-13 Hoffman Engineering Corp Automatic safety guard for power presses

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US391558A (en) * 1888-10-23 Assegnqe op one
US1351116A (en) * 1920-08-31 morse
US1387553A (en) * 1920-02-28 1921-08-16 Miller Herman Protective guard for the tools of cutting and punching machines, &c.
US2350247A (en) * 1942-11-13 1944-05-30 Arthur Morris Machinery guard
US2683515A (en) * 1949-02-18 1954-07-13 Hoffman Engineering Corp Automatic safety guard for power presses

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6089148A (en) * 1999-06-07 2000-07-18 Bloomer; Thomas J Fixed stroke power press safety stop block

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