US3765293A - Overload protection arrangement for plate shears - Google Patents

Overload protection arrangement for plate shears Download PDF

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Publication number
US3765293A
US3765293A US00229051A US3765293DA US3765293A US 3765293 A US3765293 A US 3765293A US 00229051 A US00229051 A US 00229051A US 3765293D A US3765293D A US 3765293DA US 3765293 A US3765293 A US 3765293A
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US
United States
Prior art keywords
shears
fracture
cutter carrier
lower cutter
plate
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
US00229051A
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English (en)
Inventor
G Fries
E Oberhauser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Moeller and Neuman GmbH
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Moeller and Neuman GmbH
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
Application filed by Moeller and Neuman GmbH filed Critical Moeller and Neuman GmbH
Application granted granted Critical
Publication of US3765293A publication Critical patent/US3765293A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D33/00—Accessories for shearing machines or shearing devices
    • 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
    • Y10T83/8719—With transmission yieldable on overload
    • 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
    • Y10T83/8748—Tool displaceable to inactive position [e.g., for work loading]
    • Y10T83/8749—By pivotal motion
    • 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
    • Y10T83/929—Tool or tool with support
    • Y10T83/9457—Joint or connection

Definitions

  • ABSTRACT A plate shears includes a displaceable member which is disposed in the force flow of the horizontal cutting force component occurring during a cut, the displaceable member being associated with a fracture member which fractures when the horizontal force component increases excessively and which permits the respective cutter carrier supported by the displaceable member to perform a yielding movement.
  • This invention relates to an overload protection arrangement for plate shears having cutters with a horizontal cutting gap the width of which is selectively variable.
  • the width of horizontal cutting gap must be increased with increasing thickness of the plate to be cut.
  • the horizontal cutter gap may be accidentally omitted to be set to the width suitable for the smaller dimension.
  • the thin plate is then not cut, but folded into the cutter gap, whereby suddenly an increased horizontal component of the cutting force is produced which in the end must be absorbed by the shear housing; normally, however, the latter is not designed for this extraordinary load, and for reasons of cost it cannot be designed to handle such a load.
  • Misuse can also be referred to when a plate is cropped and no account is taken of the fact that each end to be cropped has a smaller thickness than the remaining plate.
  • the invention provides that at least one fracture member which protects the shears frame is inserted into the force flow path of the horizontal component of the cutting force which goes out from the displaceable cutter carrier and which is to be absorbed by the shears housing.
  • This fracture member is so designed that it responds only when the horizontal component of the cutting force increases suddenly, e.g. when three times the value of the normally occurring cutting force is attained, and thus does not disadvantageously affect the rigid support of the cutter carrier on the housing in normal cutting operation.
  • this yielding member is preferably a sup port element which is displaced by a rocking or pivotal movement and which ordinarily serves as a force transmitting member disposed between a cutter carrier and the shears housing.
  • shear pins may be used as fracture members in a construction in accordance with the invention, the shear pins being mounted in mounting blocks secured to the shears housing and engaging into the displaceable end of the support element.
  • the lower cutter carrier is connected to the shears frame by means of tie rods and is pivotally mounted at a larger spacing from its lower cutter than the tie bolts, and the tie bolts are provided with a fracture point.
  • the reaction force of the horizontal component of the cutting force exerts a torque upon the lower cutter carrier which produces increased tensional stress in the tie bolts.
  • the lower cutter carrier can perform a small pivotal movement whereby the load disappears which is transmitted by the upper cutter carrier and which otherwise must be absorbed by the shears frame.
  • FIG. 1 illustrates a partial vertical section through the displaceable cutter carrier in the region of a support point, 1 v I
  • FIG. 2 illustrates a horizontal partial section on the line II II in FIG. 1,
  • FIG. 3 illustrates a vertical section through the lower cutter carrier and the lower part of the shears frame of a plate shears
  • FIG. 4 illustrates a detail on an enlarged scale.
  • a plate shears illustrated partly in FIG. 1 has a displaceable upper cutter carrier 1 with a cutter seat 2 and an upper cutter 3 which co-operates with a lower cutter 4 in a lower cutter seat 5.
  • the horizontal component of a cutting force occurring during a cut is initially absorbed by a vertically adjustable wedge 6 which serves for adjusting the cutting gap.
  • the adjustable wedge 6 is supported on a support element 7 which is pivotally mounted at its upper end by means of a 'pin 8 secured to the shears frame 10.
  • the lower end of the support element 7 as may best be seen from FIG.
  • a lower cutter carrier 20 with its lower cutter 21 which co-operates with another cutter 23 in an upper cutter carrier 24 indicated only partly is connected to a shears frame 27 by way of tie bolts 25 and 26.
  • tie bolts 25 and 26 are provided over the length of the shears.
  • the tie bolts are provided at their ends adjacent to the shears frame 27 with screw threads 25a and 26a respectively by which they are screwed into transverse pins 28 and 29, respectively, which are inserted into openings of the shears frame 27.
  • the tie bolts 25, 26 carry nuts 30, 31.
  • the lower region of the lower cutter carrier 20 has bearing eyes 20a through which stationary pivot shafts 32 extend.
  • the pivot shafts 32 are disposed at a larger spacing from the lower cutter 21 than the tie bolts 25, 26 so that the latter are subjected to increased tensional stress when a plate is being cut and a reaction force of the horizontal component of the cutting force acts upon the lower cutter 21.
  • connection between the lower eutter carrier 20 and the shears frame 27 can be interrupted and the lower cutter carrier 20 can pivot about the pivot shafts 32 in a direction away from the shears frame 27 when horizontal cutting force component increases suddenly owing to the horizontal cutting gap between the cutters 21 and 23 being adjusted too large, fracture points are provided in the present example in the nuts 30, 31.
  • FIG. 4 an enlarged illustration of a lower tie bolt 26 with a nut 31 is given.
  • the nut 31 is constructed as a cap nut and has a member 31c of decreased cross-section serving as fracture point between a screw threaded portion 31a and a cap member 31b.
  • the cap member 31b is supported by means of a sleeve 33 on a wall of the lower cutter carrier 21. When a predetermined fracture load is reached the cap 31b is broken off the screw threaded portion 31a whereby the tie rod connection is interrupted.
  • the tie rods are subjected to increased tensional stress during an overload whereby the fracture points 310 break.
  • the fracture points of the nuts 30 and 31 must be designed differently in respect of their predetermined fracture load.
  • the fracture cross sections of the nuts 30 must be smaller than the fracture cross-section of the nuts 31 in order than all fracture points respond as simultaneously as possible in the case of an overload.
  • the lower cutter carrier 20 can pivot away from the shears frame 27 whereby the overload is made ineffective. In order that the lower cutter carrier 20 can perform this pivotal movement, the base or foundation on which the shears rests is relieved below the lower cutter carrier 20, as may be seen at 34.
  • a plate shearing means including a shears frame, upper and lower cutter means supported in upper and lower cutter carrier means mounted in said shears frame for mutually relative displacement in a vertical direction to effect a cut, wherein the lower stationary cutter carrier (20) is connected to the shears frame (27) by means of tiebolts (25,26) and pivotally mounted at a larger spacing from its lower cutter than the tie bolts, and wherein each tie bolt is provided with a fracture member (30,31).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shearing Machines (AREA)
  • Accessories And Tools For Shearing Machines (AREA)
US00229051A 1971-02-26 1972-02-24 Overload protection arrangement for plate shears Expired - Lifetime US3765293A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE7107288 1971-02-26

Publications (1)

Publication Number Publication Date
US3765293A true US3765293A (en) 1973-10-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00229051A Expired - Lifetime US3765293A (en) 1971-02-26 1972-02-24 Overload protection arrangement for plate shears

Country Status (4)

Country Link
US (1) US3765293A (de)
FR (1) FR2127951A7 (de)
GB (1) GB1382908A (de)
IT (1) IT947893B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4182186A (en) * 1978-03-28 1980-01-08 Hirsch Louis W Notching mechanism
US20050150343A1 (en) * 2002-09-18 2005-07-14 Thomas Deimel Device located on scrap shears or similar for reducing the frictional forces that occur as a result of the action of the material to be crushed on the closing motion
CN103056442A (zh) * 2013-01-15 2013-04-24 安徽华德机床制造有限公司 液压摆式剪板机后挡料板垂直度的调整装置
CN111168138A (zh) * 2020-02-29 2020-05-19 赵丽英 一种多功能剪板机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS583890A (ja) * 1981-06-29 1983-01-10 Seiko Epson Corp 印刷機の記録紙切断装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2605836A (en) * 1948-09-29 1952-08-05 Kirwan Y Messick Knife adjusting means for power shears
FR1247825A (fr) * 1959-02-14 1960-12-02 Moeller & Neumann Gmbh Cisaille à tôles pour lignes de cisaillage de laminoirs à tôles, en particulier trains à grosses tôles, et ligne de cisaillage adaptée à cette cisaille
GB937634A (en) * 1961-07-22 1963-09-25 Siemag Siegener Masch Bau Overload safety device in machines operating under high driving forces and working pressures
US3242786A (en) * 1962-01-19 1966-03-29 Giordano Roger Francois Shearing machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2605836A (en) * 1948-09-29 1952-08-05 Kirwan Y Messick Knife adjusting means for power shears
FR1247825A (fr) * 1959-02-14 1960-12-02 Moeller & Neumann Gmbh Cisaille à tôles pour lignes de cisaillage de laminoirs à tôles, en particulier trains à grosses tôles, et ligne de cisaillage adaptée à cette cisaille
GB937634A (en) * 1961-07-22 1963-09-25 Siemag Siegener Masch Bau Overload safety device in machines operating under high driving forces and working pressures
US3242786A (en) * 1962-01-19 1966-03-29 Giordano Roger Francois Shearing machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4182186A (en) * 1978-03-28 1980-01-08 Hirsch Louis W Notching mechanism
US20050150343A1 (en) * 2002-09-18 2005-07-14 Thomas Deimel Device located on scrap shears or similar for reducing the frictional forces that occur as a result of the action of the material to be crushed on the closing motion
CN103056442A (zh) * 2013-01-15 2013-04-24 安徽华德机床制造有限公司 液压摆式剪板机后挡料板垂直度的调整装置
CN111168138A (zh) * 2020-02-29 2020-05-19 赵丽英 一种多功能剪板机

Also Published As

Publication number Publication date
FR2127951A7 (de) 1972-10-13
IT947893B (it) 1973-05-30
GB1382908A (en) 1975-02-05

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