US3906629A - Rotary shear - Google Patents

Rotary shear Download PDF

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Publication number
US3906629A
US3906629A US522483A US52248374A US3906629A US 3906629 A US3906629 A US 3906629A US 522483 A US522483 A US 522483A US 52248374 A US52248374 A US 52248374A US 3906629 A US3906629 A US 3906629A
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US
United States
Prior art keywords
shear
wheel
cutting head
rotary
shear wheel
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
US522483A
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English (en)
Inventor
Jr Francis Joseph Fuchs
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.)
Individual
Original Assignee
Individual
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 US522483A priority Critical patent/US3906629A/en
Application filed by Individual filed Critical Individual
Priority to CA233,878A priority patent/CA1020082A/en
Priority to GB36473/75A priority patent/GB1493716A/en
Priority to JP50113803A priority patent/JPS5162481A/ja
Publication of US3906629A publication Critical patent/US3906629A/en
Application granted granted Critical
Priority to FR7530958A priority patent/FR2290281A1/fr
Priority to IT69537/75A priority patent/IT1047428B/it
Priority to DE2550466A priority patent/DE2550466C2/de
Priority to HK869/79A priority patent/HK86979A/xx
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B25/00—Hand cutting tools involving disc blades, e.g. motor-driven

Definitions

  • ABSTRACT Rotary shear has power handle containing electric motor with shaft having worm gear at its end extending from motor parallel to axis of handle.
  • Cutting head rotatably mounting therein a driving shear wheel and a cooperating driven shear wheel, is connected to handle, and worm gear on shaft meshes with gear on driving shear wheel to rotate the said driving shear wheel.
  • Material to be cut is fed into cutting head between shear wheels.
  • Means are provided to more positively feed material into the cutting head, such as serrations or teeth on peripheral rear edge of driving shear wheel and/or resilient means mounted adjacent driven shear wheel to apply a pressure to the material being cut and pinch the said material against the driving shear wheel.
  • This invention relates, broadly speaking, to an improved rotary shear More specifically, thisinvention relates to an improved rotary shear having novel drive means and novel means for feeding material to be cut into the shear.
  • One of the objects of this invention is to provide an improved rotary shear.
  • Another object of this invention is to provide a rotary shear which is highly maneuverable in use so to be capable of cutting intricate patterns and which is characterized by relatively low bulk and mass so as to permit extended use without fatiguing the operator.
  • a further object of this invention is to provide a rotary shear which affords the operator at full field of view in advance of the shear thereby permitting the operator to accurately follow the lines of the pattern to be cut.
  • Still another object of this invention is to provide a rotary shear having an improved power drive.
  • Yet another object of this invention is to provide a rotary shear having improved means to feed material to be cut into the shear.
  • the invention comprises a rotary shear having a pair of shear wheels, one driving and the other driven.
  • the driving shear wheel being powered by a worm drive extending parallel to the plane of the said driving shear wheel.
  • the driven shear Wheel may, in one embodiment, be parallel to the driving shear wheel and, in an- Y other embodiment, may be placed at an angle to the driving shear wheel, The rear periphery of the driving.
  • FIG. 1 represents a view in side elevation of the rotary shear, the power handle being shown in partial medial longitudinal section, the cutting head being par tially broken away to show certain details of the worm drive.
  • FIG. 2 represents a section Of the cutting head, taken along the line 22 of FIG. ll.
  • FIG. 3 represents a view in end elevation of the cutting head, taken from the line 3--3 of FIG. 1, showing further the Outline of the power handle.
  • FIG. 4 represents a section of a modified cutting head, generally similar to FIG. 2, the driven shear wheel being shown as disposed perpendicularly to the driving shear wheel.
  • FIG. 5 represents a view in side elevation of a modified cutting head showing the driven shear wheel having a smaller diameter than the driving shear wheel for less material elevation above the table top, also indicating diagrammatically the angle of approach of the material into the cutting head.
  • FIG. 6 represents a view in side elevation of the cutting head in an alternative embodiment in which the rear peripheral edge of the driving shear wheel has scrrations or teeth to engage the surface of the material being cutthereby to more positively feed the material into the cutting head.
  • FIG. 7 represents an enlarged section of a portion of the driving shear wheel of FIG. 6, showing a serration or tooth at the rear peripheral edge thereof, the section being taken along the line 7-7 of FIG. 6.
  • FIG. 8 represents diagrammatically a view in side elevation of a further modification of the cutting head, showing the resiliently mounted feeding wheel associated with the driven shear wheel, and serrations or teeth on the rear peripheral edge of the driving shear wheel in the manner of FIG. 6.
  • FIG. 9 represents a section taken along the line 9-9 of FIG. 8, showing the driven shear wheel together with the feeding wheel adjacent the front face of the driven shear wheel.
  • Rotary shear 1 comprises a power handle 2 housing an electric motor 3 which may be driven by suitable connection through a power cord (not shown) to an electric main. Alternatively, the electric motor 3 may be driven by batteries (not shown) enclosed within the said power handle 2, the batteries being rechargeable or not as desired.
  • a rotatable shaft 6 having a coupling 7 at one end and a worm gear 8 at the opposite end, extends through one end of the power handle 2.
  • Coupling 7 receives one end of the armature9 ofthe electric motor 3, set screw 10 securing the coupling 7 to the armature 9 as shown in FIG. 1.
  • Power handle 1 is contoured on its exterior surfaces to provide a comfortable and. secure manual grip for the Operator of the rotary shear 1.
  • Cutting head 11 comprises driving shear wheel 12 and driven shear wheel 13 rotatably mounted in a frame 14 having a bracket extension 15 secured to power handle 2 by means of screws 16 as shown.
  • driving shear wheel 12 is seen as being coaxially mounted in screw 17 with backing wheel 18, nut 19 threaded on the said screw 17 firmly pressing together the driving shear wheel 12 and backing wheel 18 thereby to prevent relative rotation therebetween.
  • Driving shear wheel 12 and backing wheel 18 have diverging portions 20 and 21, respectively, which define an inner race for ball bearings 22 positioned around the entire periphery of the inner race.
  • the frame 14 comprises two portions 23 and 24 cooperating to define an outer race for the said ball bearings 22. It will be seen, therefore, that the driving shear wheel 12 and associated backing wheel 18 are peripherally supported in frame 14 for rotation about the axis of screw 17.
  • Backing wheel 18 includes a tooth-carrying projection 25 around the entire periphery thereof meshing with worm gear 8 on shaft 6. Operation of electric motor 3 will therefore produce rotation of driving shear wheel 12 within frame 14.
  • Driven shear wheel 13 is coaxially mounted on screw 26 with backing wheel 27, nut 28 threaded on the said screw 26 firmly pressing together the driven shear wheel 13 and backing wheel 27 thereby to prevent relative motion therebetween.
  • Driven shear wheel 13 and backing wheel 27 have diverging portions 29 and 30, respectively, which define an inner race for ball bearings 31 positioned around the entire periphery of the inner race.
  • the frame 14 comprises two portions 32 and 33 cooperating to define an outer race for the said ball bearings 31. It will be seen, therefore, that the driven shear wheel 13 and associated backing wheel 27 are peripherally supported for rotation within frame 14 about the axis of screw 26.
  • Driving shear wheel 12 and driven shear wheel 13 are mounted within frame 14 in such manner that their peripheral cutting edges 34 and 35, respectively, contact each other with a slight overlap as clearly shown in FIGS. 1-3.
  • Frame 14 includes a cover 36 protecting worm gear 8 and backing wheel 18.
  • the operator holds power handle 1 with trigger switch 4 depressed, thereby driving electric motor 3 and rotating driving shear wheel 12 within frame 14 of cutting head 11.
  • the operator advances rotary shear 1 into the material 37 to be cut, generally along the outline of a pattern on the said material 37.
  • Driving shear wheel 12, rotating as indicated by the arrow in FIG. 1. draws in the said material 37 between the driving shear wheel 12 and the driven shear wheel 13, whereby the driven shear wheel 13 is caused to rotate as indicated by the arrow in FIG. 1, and the material 37 is sheared between the two shear wheels 12 and 13.
  • the particular driven arrangement connecting the power handle 2 and the cutting head 11 permits an inline arrangement of the said cutting head 11 relative to the said power handle 2, thereby affording the operator of the rotary shear l a clear line of sight along the material 37 being cut.
  • This fact, coupled with the generally compact arrangement of the parts of rotary shear 1, permits great maneuverability and accurate cutting along intricate patterns laid out on the said material 37.
  • frame 14 is bent so as to dispose driven shear wheel 13 perpendicularly to driving shear wheel 12, the peripheral cutting edges 34 and meeting at a common tangent.
  • the outline of the power handle 2 relative to the cutting head 11 is clearly shown.
  • This embodiment 4 of cutting head 1l, w,hich is'c onnected to and driven by power handle 2 in the same manner as hereinbefore described for the embodiment of cutting head 11 shown in FIGS.
  • the driven shear wheel 13 which will underlie the material being cut, will be advanced under the material generally parallel to the tablefthereby permitting the said material to be cut without being elevated greatly off the table, which will reduce operator fatigue in cutting the material and which may promote accuracy in following a pattern on the material.
  • a'modified cutting head 11 is shown with a driven shear wheel 13 of smaller diameter than the driving shear wheel 12 in order to reduce the elevation of the material 37 being'cut over'the table top.
  • the minimum diameter 'of driven shear wheel 13 is sele'cted relative to' the diameter of driving shear wheel 12 so that, at maximum material thickness, the tangent of the angle of approach a, the sides of which angle a are the tangents to the shear wheels 12 and 13 at the initial points of contact with the entering material 37, is equal to or less than the minimum coefficient of friction between the shear wheels 12 and 13 and the material 37.
  • the angle a will advantageously lie in the approximate range of 2540.
  • the peripheral cutting edge 34 of driving shear wheel 12 has on its rear (i.e., on that portion thereof which does not face the driven shear wheel 13) teeth or serrations 38 extending around the entire periphery thereof.
  • the teeth or serrations 38 positively engage or catch the surface of the said material to promote a more positive feed of the material into the cutting head 11.
  • resilient means are mounted coaxially with the driven shear wheel 13, which resilient means are adapted to bear against the material 37 being cut and to pinch the said material against the driving shear wheel 12 so as to more positively feed the material 37 into the cutting head 11.
  • Such resilient means is seen as comprising a central hub 39 mounted on screw 26 against the front of driven shear wheel 13, a feeding wheel 40 having an outer diameter slightly larger than the outer diameter of the driven shear wheel 13, and a plurality of springs 41 interposed between the inner diameter 42 of the feeding wheel 40 and the outer diameter of the central hub 39, counterbores being provided in the feeding wheel 40 and the central hub 39 to receive and retain in position the springs 41.
  • the feeding wheel 40 is free to slide along the driven shear wheel 13 and is centered about the central hub 39 by the springs 41 in the absence of forces tending to slide the feeding wheel 40 relative to the driven shear wheel 13.
  • the springs 41 When such a force isapplied to the feeding wheel 40, at the periphery thereof directed radially inwardly, the springs 41 will be distorted as shown in FIG. 8.
  • the rotary shear 1 is advanced into the material 37 being cut. Because the outer diameter of the feeding wheel 40 is greater than the outer diameter of the driven shear wheel 13, the material 37 will depress the feeding wheel 40 against the force of the springs 41, and the reaction of the springs 41 will maintain the feeding wheel 40 in engagement with the material 37, to pinch the material 37 between the feeding wheel 40 and the driving shear wheel 12, thereby producing a more positive feed of the material 37 into the cutting head 11.
  • the rotatable mounting of the feeding wheel 40 insures the maintenance of engagement with the material 37 throughout the entire cutting operation.
  • the driving shear wheel 12 will have on its peripheral rear edge serrations or teeth 38 in the same manner as shown in FIGS. 6 and 7.
  • a rotary shear for cutting material comprising:
  • a first shear wheel rotatably mounted within said cutting head and having a peripheral cutting edge
  • a second shear wheel rotatably mounted within said cutting head and having a peripheral cutting edge
  • peripheral cutting edges of said first and second shear wheels being adapted to cooperate to cut material fed into said cutting head between the said first and second shear wheels
  • gear means mounted to said first shear wheel and meshing with said worm gear on said shaft;
  • said second shear wheel is disposed perpendicularly to said first shear wheel.
  • resilient means mounted to said second shear wheel and adapted to bear against said material and pinch said material against said first shear wheel.
  • said resilient means comprises:
  • a feeding wheel positioned around said hub, the outer diameter of said feeding wheel being larger than the outer diameter of said second shear wheel, the inner diameter of said feeding wheel being spaced from the outer diameter of said hub,
  • spring means operatively positioned between the outer diameter of said hub and the inner diameter of said feeding wheel whereby to resiliently center said feeding wheel around said hub.
  • teeth spaced around the periphery of said first shear wheel and adapted to engage said material.
  • the outer diameter of said second shear wheel is less than the outer diameter of said first shear wheel.
  • a rotary shear as in claim 8 wherein:
  • said first and second shear wheels are adapted to define with said material an angle of approach a lying in the approximate range 2540.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Knives (AREA)
  • Nonmetal Cutting Devices (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
US522483A 1974-11-11 1974-11-11 Rotary shear Expired - Lifetime US3906629A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US522483A US3906629A (en) 1974-11-11 1974-11-11 Rotary shear
CA233,878A CA1020082A (en) 1974-11-11 1975-08-21 Rotary shear
GB36473/75A GB1493716A (en) 1974-11-11 1975-09-04 Rotary shear
JP50113803A JPS5162481A (en) 1974-11-11 1975-09-22 Kaitensendanki
FR7530958A FR2290281A1 (fr) 1974-11-11 1975-10-09 Instrument de decoupage manuel a disques de coupe rotatifs
IT69537/75A IT1047428B (it) 1974-11-11 1975-10-10 Cesoia rotativa portatile..particolarmente per il taglio di tessuti
DE2550466A DE2550466C2 (de) 1974-11-11 1975-11-10 Kreismesserschere
HK869/79A HK86979A (en) 1974-11-11 1979-12-20 Rotary shear

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US522483A US3906629A (en) 1974-11-11 1974-11-11 Rotary shear

Publications (1)

Publication Number Publication Date
US3906629A true US3906629A (en) 1975-09-23

Family

ID=24081052

Family Applications (1)

Application Number Title Priority Date Filing Date
US522483A Expired - Lifetime US3906629A (en) 1974-11-11 1974-11-11 Rotary shear

Country Status (8)

Country Link
US (1) US3906629A (ref)
JP (1) JPS5162481A (ref)
CA (1) CA1020082A (ref)
DE (1) DE2550466C2 (ref)
FR (1) FR2290281A1 (ref)
GB (1) GB1493716A (ref)
HK (1) HK86979A (ref)
IT (1) IT1047428B (ref)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4275500A (en) * 1979-05-29 1981-06-30 The Black & Decker Manufacturing Company Rotary shear
USD266222S (en) 1980-06-23 1982-09-21 Eastman Machine Company Rotary shear for use in cutting cloth and the like
US4381605A (en) * 1979-11-19 1983-05-03 Folke Holm Shearing machine having rotatable cutter wheels
US4574480A (en) * 1983-09-06 1986-03-11 Ronald L. Rusch Rotary shear cutter
US20040016129A1 (en) * 2002-07-25 2004-01-29 Lammers Anthony J. Portable handheld powered envelope opener with grip handle
EP1502715A3 (de) * 2003-08-01 2005-07-27 Ziller, Hans GmbH & Co. KG Schneidevorrichtung zum Schneiden von Verstärkungseinlagen enthaltenden Bändern
US20080017002A1 (en) * 2006-07-21 2008-01-24 The Fletcher-Terry Company Apparatus for cutting sheet material
WO2008043709A2 (de) 2006-10-12 2008-04-17 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere elektrische schere
US20090235537A1 (en) * 2007-12-28 2009-09-24 Stephen Fisher Blister package opener
US7975582B1 (en) 2008-10-13 2011-07-12 Norman Coon Strip cutting device and methods of use
US20120151780A1 (en) * 2009-08-27 2012-06-21 Rayner Design Pty Ltd Cutting apparatus
US9168188B2 (en) 2007-11-13 2015-10-27 Orthopediatrics Corporation Cast removal system
WO2022016008A1 (en) * 2020-07-15 2022-01-20 Tonyazzopardi Holdings, Llc Throatless power rotary shears
USD1006076S1 (en) * 2022-12-06 2023-11-28 Qing Jiang Metal nibbler drill attachment

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63122492A (ja) * 1986-11-11 1988-05-26 クロバ−株式会社 切断器
JPS6446497A (en) * 1987-08-12 1989-02-20 Atsuhiko Yagi Cutting apparatus
JPH0486197U (ref) * 1990-11-30 1992-07-27
DE29916122U1 (de) 1999-09-15 1999-12-09 Schmale-Holding GmbH & Co., 48607 Ochtrup Vorrichtung zum Schneiden von flächigen Werkstücken

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US576610A (en) * 1897-02-09 Island
US796708A (en) * 1904-01-11 1905-08-08 Ira L Conkling Rotary cutter.
US1422901A (en) * 1920-08-16 1922-07-18 Economy Shoe Machine Co Cutting device for leather soles
US2042097A (en) * 1935-12-31 1936-05-26 Donald Mcdermott Portable sheet material cutter
US2570195A (en) * 1950-01-24 1951-10-09 Warren N Bird Portable sheet material cutter
US2642658A (en) * 1950-07-26 1953-06-23 Robertson Co H H Cutting tool for cutting sheet metal
US2728985A (en) * 1954-12-27 1956-01-03 Robert C Quackenbush Adjustable rotary shears
US3364710A (en) * 1964-03-16 1968-01-23 Nord Aviation Shaping tool for thin sheets

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2483092A (en) * 1948-09-08 1949-09-27 Reynold E Hanke Canvas cutter and butt joiner
US2701911A (en) * 1952-11-20 1955-02-15 Maescher Albert Hand fabric cutting apparatus

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US576610A (en) * 1897-02-09 Island
US796708A (en) * 1904-01-11 1905-08-08 Ira L Conkling Rotary cutter.
US1422901A (en) * 1920-08-16 1922-07-18 Economy Shoe Machine Co Cutting device for leather soles
US2042097A (en) * 1935-12-31 1936-05-26 Donald Mcdermott Portable sheet material cutter
US2570195A (en) * 1950-01-24 1951-10-09 Warren N Bird Portable sheet material cutter
US2642658A (en) * 1950-07-26 1953-06-23 Robertson Co H H Cutting tool for cutting sheet metal
US2728985A (en) * 1954-12-27 1956-01-03 Robert C Quackenbush Adjustable rotary shears
US3364710A (en) * 1964-03-16 1968-01-23 Nord Aviation Shaping tool for thin sheets

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4275500A (en) * 1979-05-29 1981-06-30 The Black & Decker Manufacturing Company Rotary shear
US4381605A (en) * 1979-11-19 1983-05-03 Folke Holm Shearing machine having rotatable cutter wheels
USD266222S (en) 1980-06-23 1982-09-21 Eastman Machine Company Rotary shear for use in cutting cloth and the like
US4574480A (en) * 1983-09-06 1986-03-11 Ronald L. Rusch Rotary shear cutter
US20040016129A1 (en) * 2002-07-25 2004-01-29 Lammers Anthony J. Portable handheld powered envelope opener with grip handle
EP1502715A3 (de) * 2003-08-01 2005-07-27 Ziller, Hans GmbH & Co. KG Schneidevorrichtung zum Schneiden von Verstärkungseinlagen enthaltenden Bändern
US20080017002A1 (en) * 2006-07-21 2008-01-24 The Fletcher-Terry Company Apparatus for cutting sheet material
US20100071524A1 (en) * 2006-07-21 2010-03-25 The Fletcher-Terry Company Apparatus for cutting sheet material
WO2008043709A2 (de) 2006-10-12 2008-04-17 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere elektrische schere
WO2008043709A3 (de) * 2006-10-12 2008-09-18 Bosch Gmbh Robert Handwerkzeugmaschine, insbesondere elektrische schere
US20100146797A1 (en) * 2006-10-12 2010-06-17 Ernst Dreher Hand-held power tool, in particular electrical shears
US8069572B2 (en) 2006-10-12 2011-12-06 Robert Bosch Gmbh Hand-held electrical shears
US20120017448A1 (en) * 2006-10-12 2012-01-26 Ernst Dreher Hand-held electrical shears
US8316548B2 (en) * 2006-10-12 2012-11-27 Robert Bosch Gmbh Hand-held electrical shears
US9168188B2 (en) 2007-11-13 2015-10-27 Orthopediatrics Corporation Cast removal system
US20090235537A1 (en) * 2007-12-28 2009-09-24 Stephen Fisher Blister package opener
US8443518B2 (en) * 2007-12-28 2013-05-21 Stephen Fisher Blister package opener
US7975582B1 (en) 2008-10-13 2011-07-12 Norman Coon Strip cutting device and methods of use
US8640343B2 (en) * 2009-08-27 2014-02-04 Rayner Design Pty Ltd Cutting apparatus
US20120151780A1 (en) * 2009-08-27 2012-06-21 Rayner Design Pty Ltd Cutting apparatus
WO2022016008A1 (en) * 2020-07-15 2022-01-20 Tonyazzopardi Holdings, Llc Throatless power rotary shears
US20230256637A1 (en) * 2020-07-15 2023-08-17 Tonyazzopardi Holdings, Llc Throatless power rotary shears
US12528216B2 (en) * 2020-07-15 2026-01-20 Tonyazzopardi Holdings, Llc Throatless power rotary shears
USD1006076S1 (en) * 2022-12-06 2023-11-28 Qing Jiang Metal nibbler drill attachment

Also Published As

Publication number Publication date
FR2290281B1 (ref) 1982-03-05
DE2550466C2 (de) 1986-05-15
IT1047428B (it) 1980-09-10
JPS5162481A (en) 1976-05-31
HK86979A (en) 1979-12-28
CA1020082A (en) 1977-11-01
DE2550466A1 (de) 1976-05-13
GB1493716A (en) 1977-11-30
FR2290281A1 (fr) 1976-06-04

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