EP0457305A1 - Sicherheitsvorrichtung für Befestigungsmitteleintreibgerät - Google Patents

Sicherheitsvorrichtung für Befestigungsmitteleintreibgerät Download PDF

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Publication number
EP0457305A1
EP0457305A1 EP91107871A EP91107871A EP0457305A1 EP 0457305 A1 EP0457305 A1 EP 0457305A1 EP 91107871 A EP91107871 A EP 91107871A EP 91107871 A EP91107871 A EP 91107871A EP 0457305 A1 EP0457305 A1 EP 0457305A1
Authority
EP
European Patent Office
Prior art keywords
trigger
safety
safety member
relief
recited
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.)
Withdrawn
Application number
EP91107871A
Other languages
English (en)
French (fr)
Inventor
Robert J. Meyer
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.)
Duo Fast Corp
Original Assignee
Duo Fast 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
Priority claimed from US07/523,704 external-priority patent/US5035354A/en
Application filed by Duo Fast Corp filed Critical Duo Fast Corp
Publication of EP0457305A1 publication Critical patent/EP0457305A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/008—Safety devices

Definitions

  • the present invention relates generally to a safety mechanism for a fastener driving tool and more particularly, to a new and improved safety mechanism that insures that the fastener driving tool will be actuated in response to the actuation of a manually operated trigger only after a safety member of the fastener driving tool has been properly positioned against a workpiece.
  • Portable fastener driving tools are used extensively in light manufacturing sectors.
  • a fastener driving tool In its normal mode of operation, a fastener driving tool is actuated by air pressure so that a fastener, such as a nail, staple or the like, is ejected from a nosepiece of the fastener driving tool into a workpiece during a driving stroke of the tool.
  • a number of safety mechanisms for such fastener driving tools include a workpiece contact engaging member which, if not depressed against the workpiece prior to the trigger of the fastener driving tool being depressed, prevents the fastener driving tool from being fired or actuated.
  • some safety mechanisms for fastener driving tools permit the operator of the tool to continue driving fasteners with successive bumps of the workpiece contact engaging member by simply maintaining the trigger depressed. However, operation of the fastener driving tool in this manner may be dangerous.
  • Safety mechanisms for fastener driving tools are disclosed in United States Patent No. 3,784,077 issued on January 8, 1974 and in United States Patent No. 4,260,092 issued on April 7, 1981.
  • the safety mechanisms disclosed in those patents tend to prevent the disclosed fastener driving tool from being actuated to drive a fastener if a workpiece engaging portion associated with the nosepiece of the fastener driving tool is not first depressed against a workpiece or if the workpiece engaging portion is not maintained depressed against the workpiece.
  • the trigger in these devices may be pivoted or depressed without the workpiece engaging portion being depressed, thereby creating the possibility of accidental firing, particularly if the safety mechanism is compromised through wear or mishandling.
  • United States Patent Nos. 3,464,614 and 3,519,186 also disclose safety mechanisms for a fastener driving tool.
  • the safety mechanism disclosed in each of those patents includes a blocking lever that will prevent the trigger of the fastener driving tool from being depressed to actuate a driving stroke to drive a fastener unless a workpiece engaging portion is properly maintained against a workpiece.
  • the trigger may be moved somewhat prior to the workpiece engaging portion being positioned against a workpiece.
  • the fastener driving tool is not permitted to return to its standby condition unless the trigger is released completely.
  • Some existing tools allow for continued actuation of the tool even though the workpiece engaging portion of the nosepiece partially returns toward its inoperative position, as for example, when the tool recoils after being actuated. This creates the possibility that a fastener inadvertently will be driven, perhaps on top of a previously driven fastener.
  • the major object of the present invention is to provide a safety mechanism for a fastener driving tool that only allows the trigger to be fully depressed to actuate a driving stroke of the fastener driving tool when a safety member is fully engaged with the workpiece and that prevents the tool from operating if the safety member is not first engaged with the workpiece.
  • this is accomplished by interlock means whereby the trigger cannot be depressed to initiate a fastener driving stroke unless the tool is first engaged against a workpiece. Due to this feature the requirement is imposed on the operator to first engage the safety member against the workpiece before depressing the trigger to eject a fastener.
  • the safety mechanism of the present invention actually locks the safety member in an inoperative position when the trigger is depressed before the safety member is engaged against a workpiece.
  • the fastener driving tool is prevented from being actuated after ejection of a fastener if the safety member is not fully depressed against the workpiece, but nevertheless the fastener driving tool is permitted to be reset for actuation of another driving stroke even if the safety member is not completely depressed against the workpiece. This is accomplished by allowing the trigger to return to a transition position even if the tool raises slightly from the workpiece due to recoil but prohibits the trigger from again being depressed to actuate another driving stroke until after the safety member again is fully engaged with the workpiece.
  • a fastener driving tool embodying the present sent invention includes a power mechanism operable during a fastener driving stroke to drive a fastener from the tool into a workpiece.
  • the fastener driving stroke is initiated by an operator depressing a manually operable trigger that is movable between a rest or inoperative position and a firing or operative position.
  • a workpiece engageable safety member is movably affixed on the tool and is movable between a standby or inoperative position and an actuated or operative position.
  • the safety mechanism of the present invention includes an interlock mechanism associated with both the trigger and the safety member.
  • the interlock mechanism assures that (1) the trigger will not be depressed from its standby position to its actuated position unless the safety member is moved to its fully actuated or operative position by pressing the safety member against a workpiece; (2) the safety member will be locked into its standby position as long as the trigger is being depressed toward its actuated position prior to the safety member being depressed against the workpiece; (3) the trigger will be permitted to return toward its standby position even though the safety member is not fully engaged against the workpiece such that the fastener driving tool will be reset and ready for the initiation of another driving stroke as soon as the safety member again is fully depressed against the workpiece; (4) the trigger is permitted to return from its firing position to its full rest position only when the safety member is in its full actuating position; and (5) the safety member will be prevented from returning from its actuated position to its standby position while the trigger is still in its firing position.
  • the trigger has a trigger interlock portion including a trigger rod and the safety member has a safety member interlock portion including a series of three reliefs.
  • the trigger rod interacts with the safety member interlock portion and may become lodged in a particular one of the reliefs depending on the relative positions of the trigger and the safety member.
  • the fastener driving tool 10 having a trigger and safety mechanism generally designated by the reference numeral 12 and embodying the present invention.
  • the fastener driving tool 10 may be one of several different types of tools known in the art. One such tool is disclosed in United States Patent No. 3,683,746, the assignee of which is the assignee of record of the present application. The disclosure of U.S. Patent No. 3,683,746 is incorporated by reference herein.
  • the fastener driving tool 10 is operable to drive fasteners (not shown) into a workpiece (also not shown) by ejecting fasteners from a nosepiece or nose portion 14 of the fastener driving tool 10 when the nosepiece 14 is placed against the workpiece.
  • a driving stroke is initiated by depressing a trigger 16 so that the trigger 16 moves from an inoperative or rest position as illustrated in FIGS. 1-2 to an operative or firing position illustrated in FIG. 4.
  • a manually operable safety member 18 forming a portion of the trigger and safety mechanism 12 is movably mounted on the nosepiece 14 of the fastener driving tool 10.
  • the safety member 18 moves from an inoperative or standby position as illustrated in FIGS. 1-2 to an operative or actuating position as illustrated in FIGS. 3-4 when a workpiece engaging portion 20 of the safety member 18 is pushed and properly maintained against a workpiece.
  • the safety interlock mechanism 22 insures that (1) the trigger 16 will not be depressed from its standby position to its actuated position unless the safety member 18 is moved to its fully actuated or operative position by pressing the safety member 18 against a workpiece; (2) the safety member 18 will be locked into its standby position as long as the trigger 16 is being depressed toward its actuated position prior to the safety member 18 being depressed against the workpiece; (3) the trigger 16 will be permitted to return toward its standby position even though the safety member 18 is not fully engaged against the workpiece such that the fastener driving tool 10 may be reset and ready for the initiation of another driving stroke as soon as the safety member 18 again is fully depressed against the workpiece; (4) the trigger 16 is permitted to return from its firing position to its full rest position only when the safety member 18 is in its full actuating position; and (5) the safety member 18 will be prevented from returning from its actuating position to its stand
  • the safety interlock mechanism 22 provides the fastener driving tool 10 with various safety or interlock functions.
  • the trigger 16 cannot be depressed to actuate a driving stroke of the fastener driving tool 10 unless the safety member 18 is placed in its full, actuating position as illustrated in FIG. 3 of the drawings by depressing the workpiece engaging portion 20 against the workpiece into which a fastener is to be driven.
  • the safety member 18 is permitted to move from its actuating position to its standby position only when the trigger 16 is at its rest position. If the trigger 16 is depressed prior to the safety member 18 being moved towards its operative position illustrated in FIG. 3, the safety interlock mechanism 22 locks the safety member 18 in its inoperative position until the trigger 16 is fully released (see FIG. 7).
  • Another interlock mode is provided to prevent the recycling of the fastener driving tool 10 unless the safety member 18 is in its fully actuated position.
  • the trigger 16 is prevented from returning to its firing position unless the safety member 18 is at its fully actuated position.
  • a driving stroke of the fastener driving tool 10 is initiated by the manual depression of the trigger 16 by an operator.
  • the trigger 16 includes a trigger actuating portion 24 extending from a pivotable portion 26.
  • the pivotable portion 26 is pivotally mounted to the fastener driving tool 10 by a pin or rod 28.
  • a finger of an operator depresses or actuates the trigger actuating portion 24 and if the safety member 18 is in its fully actuated or operative position shown in FIG. 3
  • the trigger 16 is permitted to rotate about the pin 28 in a generally counterclockwise direction as the trigger 16 is viewed in FIGS. 1 and 3 of the drawings.
  • pins 30 and 31 associated with a trigger valve 32 are displaced as shown in FIG.
  • the pin 30 extends between an upper surface 34 of the trigger actuating portion 24 and a spring 36 that is disposed about the pin 31.
  • the pin 30 is hollow so that the lower end of the pin 31 can extend into the pin 30.
  • a biasing spring 38 normally maintains the trigger 16 in its inoperative position.
  • the pin 30 will move up as it is viewed in the drawings and as described in more detail below, the pin 31 also will be moved upward.
  • the trigger valve 32 is closed and as will be described hereinafter a driving stroke of the fastener driving tool 10 is initiated.
  • a trigger interlock portion 39 forms the opposite end of the trigger 16 from the trigger actuating portion 24.
  • the trigger interlock portion 39 also pivots about the pin 28 and includes a trigger rod or pin 40 that has its longitudinal axis generally perpendicular to the longitudinal axis of the trigger 16.
  • the trigger rod 40 interacts with a safety member interlock portion 42 of the safety member 18 so as to provide the fastener driving tool 10 with the various different safety modes or features described above.
  • the safety member 18 is slidably mounted about the nosepiece 14 of the fastener driving tool 10. It is biased to its standby or inoperative position illustrated in FIGS. 1-2 and 7 by a biasing spring 44 that is mounted between a lower surface 46 on a front end 48 of the fastener driving tool 10 and a flange 50 extending from a depending region 52 of the safety member 18.
  • the safety member 18 is generally S-shaped and includes the depending region or linking portion 52 which extends between the workpiece engaging portion 20 and an intermediate portion 54 that extends to the safety member interlock portion 42.
  • the safety member interlock portion 42 is secured to the intermediate portion 54 and includes a projecting member 56 and three reliefs or recesses 58, 60, and 62 on a side 64 of the safety member interlock portion 42 facing or adjacent to the trigger rod 40.
  • the fastener driving tool 10 is in its standby or static mode when the safety member 18 is in its inoperative position and the trigger 16 is likewise in its inoperative position.
  • This static mode of the fastener driving tool 10 is illustrated in FIG. 1-2 of the drawings.
  • the trigger valve 32 is open such that a trigger valve ball 65 is held against an O-ring seal 66 due to the high air pressure being supplied through an inlet line 68 and notwithstanding the upper force being applied by the biasing spring 36.
  • the line 68 is maintained in communication with an air line 70 and the driving blade of the fastener driving tool 10 is maintained in its static, non-driving condition.
  • the trigger rod 40 is disposed adjacent the projecting member 56 as long as the safety member 18 is maintained in its inoperative position. If any attempt is made to depress the trigger 16 while the safety member 18 is in its inoperative position illustrated in FIG. 1, the trigger rod 40 will become lodged in the upper relief 58 formed just above the projecting member 56 (see, for example, FIG. 7 of the drawings). When the trigger rod 40 becomes so lodged in the relief 58, the trigger 16 cannot be depressed any further so that the trigger valve 32 will remain open. As a result, a driving stroke of the fastener driving tool 10 cannot be initiated. Moreover, with the trigger rod 40 lodged in the relief 58, the safety member 18 becomes locked in its inoperative position shown in FIG.
  • the workpiece engaging portion 20 of the safety member 18 In order for a driving stroke of the fastener driving tool 10 to be initiated, the workpiece engaging portion 20 of the safety member 18 must be forced against a workpiece such that the safety member 18 will move relative to the nosepiece 14 of the fastener driving tool 10 against the force of the spring 44 to its operative position shown in FIG. 3 of the drawings.
  • the safety member 18 When the safety member 18 is in its operative position, the lower relief 62 is exposed or becomes accessible to the trigger rod 40.
  • an operator of the fastener driving tool 10 may depress the trigger actuating portion 24 of the trigger 16 upwardly as the trigger member 16 is viewed in FIG. 4 of the drawings.
  • the trigger rod 40 pivots in an arcuate path such that the trigger rod 40 becomes lodged in the lower relief 62 of the safety member interlock portion 42.
  • the upward movement of the upper surface 34 of the trigger actuating portion 24 results in the displacement of the pin 30 upwardly such that the spring 36 associated with the trigger valve 32 is compressed.
  • the trigger 16 remains in its fully operative position illustrated in FIG. 4 of the drawings, the trigger valve 32 remains closed preventing a return stroke of the fastener driving tool 10 such that another driving stroke of the fastener driving tool 10 cannot be initiated.
  • the trigger 16 may be released by the operator so as to be in the position disclosed in FIG. 3 if the safety member 18 remains in its fully actuated position illustrated in FIG. 3 of the drawings. Another driving stroke then can be initiated by the operator again depressing the trigger 16.
  • the recoil and shock that is exerted against the fastener driving tool 10 as a result of the driving of a fastener into a workpiece has a tendency to raise the fastener driving tool 10 away from the workpiece such that the safety member 18 moves slightly away from its fully operative position.
  • the operator tends to slightly relax his grip on the trigger member 16 due to this recoil.
  • the fastener driving tool 10 is placed in a transition mode that is illustrated in FIGS. 5 and 8 of the drawings wherein the trigger member 16 is shown as having been moved slightly away from its fully actuated position and the safety member 18 is shown as having likewise moved slightly away from its fully operative position.
  • the trigger rod 40 is positioned somewhere between the lower relief 62 and the middle or transitory relief 60. Even though the trigger 16 has moved slightly away from its fully actuated or operative position, the force exerted by the springs 36 on the pin 31 is sufficient to maintain the trigger valve ball 65 against the air inlet 68 notwithstanding the air pressure being applied against the ball valve 65 from the air inlet 68. Consequently, the fastener driving tool 10 is not returned to its static mode so that a return stroke of the fastener driving tool 10 cannot be accomplished and another driving stroke will not be initiated.
  • the spring 44 associated with the safety member 18 moves the safety member 18 further away from its fully operative position (see, for example, FIG. 6 of the drawings).
  • the safety member 18 moves to this position, the trigger rod 40 is exposed to the relief 60 and the trigger 16 can be moved by the spring 38 towards its fully inoperative position. Even though the trigger rod 40 is disposed in the relief 60, the trigger 16 is prevented from returning to its fully inoperative position. Nevertheless, the movement of the trigger 16 to the transition position illustrated in FIG. 6 is sufficient to relax the force being applied to the trigger valve ball 65 by the biasing spring 36.
  • the air pressure in the air inlet 68 is sufficient to move the trigger valve ball 65 against the O-ring seal 66 and the trigger valve 32 again is opened.
  • the trigger valve 32 With the trigger valve 32 so open, the pneumatic circuit between the air inlet 68 and the air line 70 is reestablished so that a return stroke of the fastener driving tool 10 is initiated and the fastener driving tool 10 again is set in its static mode. If the trigger 16 were prevented from moving away from its firing position as long as the safety member 18 is not returned to its fully inoperative position, a fastener may be inadvertently ejected from the fastener driving tool 10 if the high air pressure source is disconnected from the fastener driving tool 10 and later reconnected.
  • the repositioning of the trigger 16 in the transition position illustrated in FIG. 6 of the drawings does not permit another driving stroke to be initiated as long as the safety member 18 is in this transitive position because as long as the trigger rod 40 is disposed in the middle relief 60, the trigger rod 40 is blocked by the safety member interlock portion 42 and the trigger 16 cannot be depressed again to initiate another driving stroke of the fastener driving tool 10. It is only when the safety member 18 again is returned to its fully operative position as, for example, illustrated in FIG. 3 of the drawings, that the trigger rod 40 is exposed to the lower relief area 62 and the trigger 16 can be depressed for initiation of another driving stroke.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
EP91107871A 1990-05-15 1991-05-15 Sicherheitsvorrichtung für Befestigungsmitteleintreibgerät Withdrawn EP0457305A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US523704 1990-05-15
US07/523,704 US5035354A (en) 1990-05-15 1990-05-15 Safety dual-interlock system for fastener driving tool
US69121391A 1991-04-30 1991-04-30
US691213 1991-04-30

Publications (1)

Publication Number Publication Date
EP0457305A1 true EP0457305A1 (de) 1991-11-21

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ID=27061231

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91107871A Withdrawn EP0457305A1 (de) 1990-05-15 1991-05-15 Sicherheitsvorrichtung für Befestigungsmitteleintreibgerät

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EP (1) EP0457305A1 (de)
JP (1) JPH0679649A (de)
AU (1) AU7704691A (de)
CA (1) CA2042497A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6648202B2 (en) 2001-02-08 2003-11-18 Black & Decker Inc. Pneumatic fastening tool
CN111283406A (zh) * 2020-03-24 2020-06-16 广西玉柴机器股份有限公司 一种单向通过工件并自动防工件回流的方法及装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200942375A (en) * 2008-04-07 2009-10-16 Basso Ind Corp Nail gun with safety device

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784077A (en) * 1972-05-05 1974-01-08 Textron Inc Portable pneumatic fastener driving device with improved actuating mechanism
GB2024691A (en) * 1978-07-05 1980-01-16 Duo Fast Corp Nail driving tool
US4260092A (en) * 1979-07-02 1981-04-07 Duo-Fast Corporation Safety assembly for a tool for driving fasteners
GB2076891A (en) * 1980-05-28 1981-12-09 Hilti Ag Combustion-powered fastener- driving tool
GB2117692A (en) * 1982-02-11 1983-10-19 Black & Decker Inc Latching arrangement for a power-driven tacker
EP0203620A1 (de) * 1985-05-29 1986-12-03 Signode Corporation Steuerorgan eines Eintreibwerkzeugs für Befestigungsmittel
DE3703753A1 (de) * 1987-02-07 1988-08-18 Haubold Kihlberg Gmbh Eintreibgeraet fuer befestigungsmittel mit einer ausloesesicherheitseinrichtung
DE8810753U1 (de) * 1988-08-25 1988-10-20 Joh. Friedrich Behrens AG, 2070 Ahrensburg Eintreibgerät für Befestigungsmittel
DE8914926U1 (de) * 1989-12-19 1990-02-01 Joh. Friedrich Behrens AG, 2070 Ahrensburg Auslösegesichertes Eintreibgerät für Befestigungsmittel

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784077A (en) * 1972-05-05 1974-01-08 Textron Inc Portable pneumatic fastener driving device with improved actuating mechanism
GB2024691A (en) * 1978-07-05 1980-01-16 Duo Fast Corp Nail driving tool
US4260092A (en) * 1979-07-02 1981-04-07 Duo-Fast Corporation Safety assembly for a tool for driving fasteners
GB2076891A (en) * 1980-05-28 1981-12-09 Hilti Ag Combustion-powered fastener- driving tool
GB2117692A (en) * 1982-02-11 1983-10-19 Black & Decker Inc Latching arrangement for a power-driven tacker
EP0203620A1 (de) * 1985-05-29 1986-12-03 Signode Corporation Steuerorgan eines Eintreibwerkzeugs für Befestigungsmittel
DE3703753A1 (de) * 1987-02-07 1988-08-18 Haubold Kihlberg Gmbh Eintreibgeraet fuer befestigungsmittel mit einer ausloesesicherheitseinrichtung
DE8810753U1 (de) * 1988-08-25 1988-10-20 Joh. Friedrich Behrens AG, 2070 Ahrensburg Eintreibgerät für Befestigungsmittel
DE8914926U1 (de) * 1989-12-19 1990-02-01 Joh. Friedrich Behrens AG, 2070 Ahrensburg Auslösegesichertes Eintreibgerät für Befestigungsmittel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6648202B2 (en) 2001-02-08 2003-11-18 Black & Decker Inc. Pneumatic fastening tool
CN111283406A (zh) * 2020-03-24 2020-06-16 广西玉柴机器股份有限公司 一种单向通过工件并自动防工件回流的方法及装置

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Publication number Publication date
AU7704691A (en) 1991-11-21
CA2042497A1 (en) 1991-11-16
JPH0679649A (ja) 1994-03-22

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