US3840987A - Protective device for a power tool - Google Patents

Protective device for a power tool Download PDF

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Publication number
US3840987A
US3840987A US00419794A US41979473A US3840987A US 3840987 A US3840987 A US 3840987A US 00419794 A US00419794 A US 00419794A US 41979473 A US41979473 A US 41979473A US 3840987 A US3840987 A US 3840987A
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US
United States
Prior art keywords
shield
work zone
protective device
frame
tool
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
US00419794A
Other languages
English (en)
Inventor
L Netta
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.)
ABB Installation Products Inc
Original Assignee
Thomas and Betts Corp
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 Thomas and Betts Corp filed Critical Thomas and Betts Corp
Priority to US00419794A priority Critical patent/US3840987A/en
Priority to CA211,240A priority patent/CA1012882A/en
Application granted granted Critical
Publication of US3840987A publication Critical patent/US3840987A/en
Priority to AU74517/74A priority patent/AU473006B2/en
Priority to NL7415155A priority patent/NL7415155A/xx
Priority to JP13443674A priority patent/JPS534954B2/ja
Priority to SE7414845A priority patent/SE407274B/xx
Priority to IT54221/74A priority patent/IT1023398B/it
Priority to FR7438717A priority patent/FR2252529A1/fr
Priority to GB51376/74A priority patent/GB1479336A/en
Priority to DE2456378A priority patent/DE2456378C3/de
Priority to BE150965A priority patent/BE822723A/xx
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F16P3/00—Safety 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
    • F16P3/02—Screens or other safety members moving in synchronism with members which move to and fro
    • F16P3/04—Screens 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F11/00—Cutting wire
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/04—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for forming connections by deformation, e.g. crimping tool
    • H01R43/042—Hand tools for crimping

Definitions

  • a selectively operable safety shield comprising a preferably U-shaped member coupled to the frame of a power tool is biased towards a first position straddling the normally exposed work zone of the tool to restrict inadvertent contact with the moving members thereof to prevent injury to an operator utilizing such tool.
  • the shield may be manipulated away from its closed position to selectively expose the work zone by cooperative engagement with the workpiece. Further movement of the shield may be accomplished by attaching it to a preferably pivoting support coupled to the frame of the tool to permit the tool tobe engaged mid-span of a length of the workpiece.
  • Prior art tools which may be both manually and power operated and which may include cutting and crimping devices in which the die portions thereof are urged towards one another under relatively high pressure generally comprise a suitably formed aperture defining the work zone and are designed to unobstructively receive the workpiece preparatory to the performance of the specified operation thereon.
  • the resulting exposed work zone generally presents an extremely hazardous condition for an operator who may inadvertently insert one or more fingers between the die members of the tool while the power stroke is initiated.
  • the invention overcomes the problems and limitations noted above with respect to prior art devices by providing a protective device for power tools and the like, which is safer, more versatile, simpler, more convenient, and more economical than such prior art devices.
  • the protective device comprises, in one embodiment, a preferably U-shaped shield movably coupled to a die support attached to the frame of a power tool and biased towards a first or closed position straddling the normally exposed work zone of the power tool to restrict inadvertent access thereto.
  • the shield is provided with manipulating means which may take the form of a flanged shoulder arranged to abut the workpiece so that the shield is displaced and the workpiece inserted into the work zone in essentially one continuous operation.
  • the shield is appropriately biased to remain in contact with the workpiece during operation of the tool so as to preclude the entry of any further material or a part of the operators body into the work zone during the power stroke.
  • the stationary die member of a two part shearing die may be unlatched from its normal position and selectively pivoted away from the work zone while one edge of the die engages a portion of the shield so that the shield is also manipulated away from the work zone as the tool is opened, for example, for mid-span engagement about a conductor or the like.
  • the support member to which the shield is coupled is pivotingly attached to the tool frame to permit the shield to be displaced to a further or third position with respect to the work zone.
  • the operator may thus bring the tool to the workpiece and, in a single operation, employ the workpiece to reposition the shield permitting entry of the workpiece into the work zone in a safe, convenient, and simple procedure. It is therefore an object of this invention to provide a protective device for power tools and the like.
  • FIG. 1 is a fragmentary front elevational view, partly cut away and partly, in section, of aprotective device for a power tool constructed in accordance with the concepts of the invention.
  • FIG. 2 is a top plan view of the protective device illustrated in FIG. 1.
  • FIG. 3 is a rear elevational view, partly cut away, of the protective device illustrated in FIG. 1.
  • FIG. 4 is a fragmentary front elevational view, showing the device of FIG. 1 in a partially open state, with a conductor, in section, shown engaged therein.
  • FIG. 5 is a fragmentary front elevational view, of the device of FIG. 1 selectively pivoted to an open position to show the manner of mid-span engagement with a conductor, shown in section therein.
  • FIG. 6 is a fragmentary front elevational view, partly cut away and partly in section, of thedevice of FIG. 1 attached to 'a modified form of the power tool illustrated in FIG. 1.
  • FIG. 7 is a fragmentary front elevational view, of the device of FIG. 1 attached to a further modified form of the power tool illustrated in FIG. 1, and showing a conductor, in section, adjacent the work zone thereof.
  • FIG. 8 is a fragmentary front elevational view of another embodiment of a protective device constructed in accordance with the concepts of the invention.
  • FIG. 9 is a fragmentary rear elevational view, partly cut away and partly in section, of the assembly illustrated in FIG. 1.
  • FIG. 10 is a fragmentary front elevational view, of the device of FIG. 8 in a partially open state about an insulatedconductor, shown in section, disposed within the work zone of a power tool.
  • FIGS. 1, 2, 3, 4 and 5 there is shown a power tool having a protective device 22 constructed in accordance with the concepts of the invention.
  • the protective device 22 comprises an essentially U-shaped shield 24 pivotingly coupled by means of a pin 26 to a first support means 28 affixed to the power tool frame 30.
  • a torsion spring 32 engages a lanced portion 34 located at the bight of the U of the shield 24 and is brought around the coupling pin 26 and thereafter into engagement with the first support means 28 as at 36.
  • the torsion spring 32 biases the shield 24 in a counterclockwise direction, as viewed in FIG.
  • first die member 40 and a second die member 42 which die members, for the purpose of illustration only and not as a limitation of the type of tool with which the shield 24 may be employed, comprise a pair of blades suitable, for example, for shearing electrical cable or the like.
  • die members 40 and 42 respectively, thus comprise a relatively sharp, knife-like inner edge 44 and 46, respectively.
  • the lower die member 40 is attached to a piston 48 fitted within a cylinder 50 to which may be applied a hydraulic fluid such as, for example, oil or air through a coupling 52 to drive the piston 48 and its associated die member 40 towards the stationary die member 42.
  • each of the flanged portions 54, 56,- is provided with an upturned portion 58, 60 respectively, adjacent the free edge thereof to facilitate engagement therewith by the workpiece which may include, for example, a conductor such as 62, (see FIG.
  • the end of which may be employed to raise the shield 24 sufficiently to provide access to the work zone 38 and permit the conductor 62 to the inserted therewithin.
  • This procedure may be accomplished by placing the end of the conductor 62 beneath either one of the flanged portions 54, 56, and raising the conductor sufficiently to cause the shield 24 to rotate about its coupling pin 26 to expose the work zone 38 so that the conductor 62 may be advanced into the work zone 38 between the die members 40, 42.
  • the shield 24, being biased towards the closed position by the torsion spring 32, will tend to maintain intimate contact with the outer surface of the conductor 62 so as to at least partially shroud the remaining exposed portion of the work zone 38 during the subsequent shearing operation.
  • the shield 24 being suitably biased, to cause to rotate back to its first or closed position as illustrated in FIG. 1, thereby re-establishing a guard about the work zone 38 preparatory to the next operation.
  • a slotted portion 64 suitably dimensioned to receive a pin 66 attached to the support member 28.
  • the right side of the slotted portion 64 is arranged to abut the pin 66 to restrict the counterclockwise movement of the shield 24 in its first or closed position whereas the left side of the slotted portion 64 is arranged to provide a stop for the shield 24 in the open or second position.
  • the shield 24 may be conveniently manipulated by means of either one of the flanged portions 54, 56, it may also be rotatably displaced from its first or closed position by cooperative engagement with the upper die member 42, as illustrated in greater detail in FIG. 5.
  • a second support member 68 pivotingly coupled to the frame means 30 of the power tool 20 by means of a pin 70 comprises a retaining pin 72 adjacent its upper or free end.
  • the pin 72 is arranged to engage the hook like end 74 of the upper die member 42 to releasably lock the die member 42 to the power tool frame 30.
  • the upper die member 42 is released from its locked position by subjecting it to a slight downward pressure to release its hook portion 74 from engagement with the retaining pin 72.
  • the upper die member 42 may then be rotated about the pin 66 in a clockwise direction, as viewed in FIG. 5, to the position shown therein.
  • a rear edge 76 of the upper die member 42 is thus caused to abut the shield 24 as at 78'causing the shield 24 to follow the rotational movement of the upper die member 42 so that the shield 24 is also rotated clockwise, as viewed in FIG. 5, away from the work zone 38.
  • the power tool 20 is now opened sufficiently to permit its placement over the conductor 62 at any selected point along the length thereof.
  • the upper die member'42 may then be rotated counterclockwise so that its hook portion 74 re-engages pin 72 to lock the upper die member 42 in its closed position.
  • the shield 24, being released from engagement with the upper die member 42, will tend to pivot back towards its first or closed position under the influence of the biasing spring 32 and will abut the outer surface of the conductor 62 substantially as shown in FIG. 4. As shown in greater detail in FIG.
  • the biasing spring 32 is arranged to straddle the first support member 28 and abut the outer surface thereof while slidably engaged about the pin 26 and supported at its other end about the lanced portion 34 of shield 24.
  • the diameter of the spring 32 may, of course, be preselected to provide the desired biasing force for the shield 24 to insure that the shield 24 is properly maintained in its first or closed position irrespective of the position of the power tool 20 during operation.
  • a torsion spring is illustrated as providing the biasing means for the shield 24, other suitable arrangements may be provided, however, without departing from the spirit of the invention and within the concepts herein disclosed, such arrangement including, for example, compression or extension springs (not shown) coupled between the shield 24 and the support 28, or suitably formed flat springs (not shown) bearing against the shield 24 to maintain it in its first or closed position.
  • the flanged portion 54 of the shield 24, although shown as an essentially planar element, may be arcuately formed as at 80 in FIGS. 8 and 10 to more closely conform to the outer contour of, for example a circular cross section cable or the like, or alternatively, may have a polygonal configuration (not shown) where necessary or desirable and within the concepts herein disclosed.
  • the free end of the shield 24 may be extended as at 82 (FIGS. 8 and 10) to more fully encompass the workpiece and provide a further restriction of the work zone 38 during the operative cycle.
  • the power tool 84 comprises a first support member 86 which is pivotingly coupled to the power tool 84 by a pin 88 and further comprises a handle portion 90 for manipulating the support member 86 about the pin 88.
  • a second support member 92 is affixed to the frame of the power tool 84 by means of pins 94, 96, so thatthe support member 86 may be selectively pivoted about the pin 88 while the support member 92 is maintained in a stationary position.
  • This arrangement may be modified, however, as shown in FIG.
  • the support member 92 is also movably coupled to the power tool by a pin 98 so that both support members may be selectively pivoted away from the work zone.
  • the shield 24 and the die member 42 which are both coupled to the support member 86 are caused to follow the movement thereof and be dis'- placed from the work zone simultaneously. Accordingly, the upper die member 42 and the shield 24 may thus be independently or simultaneously pivoted away from the work zone, as alternative arrangements, for either midspan or end engagement with the workpiece.
  • the leading edge of the shield 24 is caused to contact the outer surface of the workpiece 62 so that the shield 24 is pivoted backwardly against the force of the biasing spring 32 to assume a position substantially as shown in FIG. 4 during the subsequent operation of the tool.
  • the shield 24 may beprovided with a further slotted portion (not shown) extending from the aperture therein through which the pin 26 is inserted generally parallel to the slotted portion 64 so that the shield 24 may be displaced both laterally and rotationally from its first or closed position to a predetermined second position substantially along the two axis to provide an additional degree of movement which may be found advantageous in certain applications.
  • the shield 24 may be manipulated from its closed position to an open position in a direction opposite to that described above, that is, as viewed. in FIG. 1, in a counterclockwise direction to provide an alternate mode of operation.
  • the shield 24 may be provided with flanged portions such as 54, .56 on both its upper and lower edges to permit both clockwise and counterclockwise manipulation of the shield, if necessary or desirable, and within the concepts herein disclosed.
  • a protective device for a power tool having a normally exposed work zone comprising: frame means; shield means pivotably coupled to said frame means and selectively movable between a first positionrestricting access to said work zone, and a second position permitting access to said work zone; means for coupling said shield means to said frame-means so that said shield means is selectively displaceable between said first position and said second position; means cooperative with said shield means and said frame means for biasing said shield means in said first position; and means for selectively manipulating said shield means from said first position to said second position, said manipulating means being adapted to cooperatively engage a workpiece intended to be inserted in said work zone to provide access to said work zone, said shield means comprising a U-shaped member pivotably coupled to said frame means, said U-shaped member having a lanced portion adjacent the bight of said U- shaped member, said biasing means comprising a torsion spring engaging said lanced portion and said coupling means to bias said shield means towards said first position.
  • a protective device as defined in claim 1 wherein said manipulating means comprises a selectively formed flanged portion extending outwardly from said shield means generally adjacent one edge thereof.
  • a protective device as defined in claim 1 wherein said manipulating means comprises a flanged portion extending outwardly from each of the legs of said U- shaped member generally adjacent one edge thereof.
  • a protective device as defined in claim 1 further comprising means for moving said shield means to a third position providing further access to said work zone.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Shearing Machines (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
US00419794A 1973-11-28 1973-11-28 Protective device for a power tool Expired - Lifetime US3840987A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US00419794A US3840987A (en) 1973-11-28 1973-11-28 Protective device for a power tool
CA211,240A CA1012882A (en) 1973-11-28 1974-10-11 Protective device for a power tool
AU74517/74A AU473006B2 (en) 1973-11-28 1974-10-21 Protective device fora power tool
NL7415155A NL7415155A (nl) 1973-11-28 1974-11-20 Beschermingsinrichting voor een gereedschap.
JP13443674A JPS534954B2 (it) 1973-11-28 1974-11-25
FR7438717A FR2252529A1 (it) 1973-11-28 1974-11-26
SE7414845A SE407274B (sv) 1973-11-28 1974-11-26 Skyddsanordning for verktyg
IT54221/74A IT1023398B (it) 1973-11-28 1974-11-26 Dispositivo di protezione per un utensile a motore
GB51376/74A GB1479336A (en) 1973-11-28 1974-11-27 Protective device for a tool
DE2456378A DE2456378C3 (de) 1973-11-28 1974-11-28 Schutzvorrichtung für eine Werkzeugmaschine
BE150965A BE822723A (fr) 1973-11-28 1974-11-28 Perfectionnements apportes aux dispositifs de protection pour outil a fonctionnementnon manuel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00419794A US3840987A (en) 1973-11-28 1973-11-28 Protective device for a power tool

Publications (1)

Publication Number Publication Date
US3840987A true US3840987A (en) 1974-10-15

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ID=23663788

Family Applications (1)

Application Number Title Priority Date Filing Date
US00419794A Expired - Lifetime US3840987A (en) 1973-11-28 1973-11-28 Protective device for a power tool

Country Status (11)

Country Link
US (1) US3840987A (it)
JP (1) JPS534954B2 (it)
AU (1) AU473006B2 (it)
BE (1) BE822723A (it)
CA (1) CA1012882A (it)
DE (1) DE2456378C3 (it)
FR (1) FR2252529A1 (it)
GB (1) GB1479336A (it)
IT (1) IT1023398B (it)
NL (1) NL7415155A (it)
SE (1) SE407274B (it)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026028A (en) * 1975-07-31 1977-05-31 Mario D. Medio Cable cutting device
US5074043A (en) * 1990-11-26 1991-12-24 Mills Edward O Safety-cable jacket remover
US6296501B1 (en) 1999-10-27 2001-10-02 Charles E. Webb Electric cable grounding piercer
US6792789B1 (en) 2003-04-03 2004-09-21 Fci Americas Technology, Inc. Hydraulic tool having removable cutting dies and crimping dies
US9083133B2 (en) 2011-04-15 2015-07-14 Pressmaster Ab Hand operated crimping tool
US9184548B2 (en) 2011-04-15 2015-11-10 Pressmaster Ab Hand operated crimping tool
CN105382143A (zh) * 2015-12-28 2016-03-09 唐花女 一种带有可视窗口且可导屑的电缆切断装置
US20180062335A1 (en) * 2016-08-24 2018-03-01 Jetool Corp. Crimping hand tool
US20180161889A1 (en) * 2016-12-09 2018-06-14 Cembre S.P.A. Working head for a compression or cutting tool

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3109974C2 (de) * 1981-03-14 1983-05-19 SMW Schneider & Weißhaupt GmbH, 7996 Meckenbeuren Einrichtung zum Abstützen eines zylinderförmigen Werkstückes auf einer Drehmaschine mit einem Späneschutz
DE102013008564B4 (de) * 2013-05-17 2022-03-17 Dürr Systems Ag Abdichtvorrichtung für ein längs einer Öffnung bewegtes Maschinenteil

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2008362A (en) * 1933-01-27 1935-07-16 Frederick A Pearson Explosive operated tool
US2237870A (en) * 1940-04-29 1941-04-08 William J Smith Plaster cutter
US3036798A (en) * 1958-03-14 1962-05-29 Martin James Cutter unit primarily for use in ejection seats for aircraft
US3142219A (en) * 1962-05-18 1964-07-28 Martin James Selectively operable line cutting device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2008362A (en) * 1933-01-27 1935-07-16 Frederick A Pearson Explosive operated tool
US2237870A (en) * 1940-04-29 1941-04-08 William J Smith Plaster cutter
US3036798A (en) * 1958-03-14 1962-05-29 Martin James Cutter unit primarily for use in ejection seats for aircraft
US3142219A (en) * 1962-05-18 1964-07-28 Martin James Selectively operable line cutting device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026028A (en) * 1975-07-31 1977-05-31 Mario D. Medio Cable cutting device
US5074043A (en) * 1990-11-26 1991-12-24 Mills Edward O Safety-cable jacket remover
US6296501B1 (en) 1999-10-27 2001-10-02 Charles E. Webb Electric cable grounding piercer
US6792789B1 (en) 2003-04-03 2004-09-21 Fci Americas Technology, Inc. Hydraulic tool having removable cutting dies and crimping dies
US9083133B2 (en) 2011-04-15 2015-07-14 Pressmaster Ab Hand operated crimping tool
US9184548B2 (en) 2011-04-15 2015-11-10 Pressmaster Ab Hand operated crimping tool
CN105382143A (zh) * 2015-12-28 2016-03-09 唐花女 一种带有可视窗口且可导屑的电缆切断装置
US20180062335A1 (en) * 2016-08-24 2018-03-01 Jetool Corp. Crimping hand tool
US10505330B2 (en) * 2016-08-24 2019-12-10 Jetool Corp. Crimping hand tool
US20180161889A1 (en) * 2016-12-09 2018-06-14 Cembre S.P.A. Working head for a compression or cutting tool
US10799962B2 (en) * 2016-12-09 2020-10-13 Cembre S.P.A. Working head for a compression or cutting tool

Also Published As

Publication number Publication date
JPS5085977A (it) 1975-07-10
AU473006B2 (en) 1976-06-10
CA1012882A (en) 1977-06-28
DE2456378B2 (de) 1979-07-12
JPS534954B2 (it) 1978-02-22
SE407274B (sv) 1979-03-19
DE2456378A1 (de) 1975-06-12
GB1479336A (en) 1977-07-13
BE822723A (fr) 1975-05-28
AU7451774A (en) 1976-04-29
FR2252529A1 (it) 1975-06-20
NL7415155A (nl) 1975-05-30
IT1023398B (it) 1978-05-10
DE2456378C3 (de) 1980-03-13
SE7414845L (it) 1975-05-29

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