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EP0147601A1 - Puffervorrichtung für Eintreibgerät von Befestigungsmitteln - Google Patents

Puffervorrichtung für Eintreibgerät von Befestigungsmitteln Download PDF

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Publication number
EP0147601A1
EP0147601A1 EP84113747A EP84113747A EP0147601A1 EP 0147601 A1 EP0147601 A1 EP 0147601A1 EP 84113747 A EP84113747 A EP 84113747A EP 84113747 A EP84113747 A EP 84113747A EP 0147601 A1 EP0147601 A1 EP 0147601A1
Authority
EP
European Patent Office
Prior art keywords
shock absorber
piston
arrangement according
driving
fastener
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Withdrawn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
EP84113747A
Other languages
English (en)
French (fr)
Inventor
Umberto Monacelli
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
Application filed by Individual filed Critical Individual
Publication of EP0147601A1 publication Critical patent/EP0147601A1/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Withdrawn legal-status Critical Current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
    • B25C1/04—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure
    • B25C1/047—Mechanical details

Definitions

  • This invention relates inter alia to shock absorber arrangements for use in fastener driving apparatus.
  • Tools used for driving fasteners into a workpiece in a single blow may use a piston and a driver, attached thereto, which travel at a very high velocity. As the piston approaches the end of a cylinder it must come to an abrupt stop. The material composing the workpiece and the size of the fastener may help slow the piston but in many cases an additional means must be provided to prevent the piston and driver from striking metallic portions of the tool body.
  • the shock absorber In designing the shock absorber, two major problems must be overcome. First it must absorb most of the energy from the moving piston without transferring it onto the body or the shock absorber will be of little use. Secondly, the shock absorber must be able to withstand repeated cycles at a high rate without tearing apart in a short time. The internal heat due to compression builds up during rapidly repeated cycles and causes accelerated deterioration of the material of the element. An element that must be replaced frequently is both costly and time consuming. The same is true with an element that allows a portion of the body to fail and need replacing.
  • An object of the present invention is to provide a shock absorber arrangement for fastener driving apparatus that does not transfer a large portion of the shock to the body of the apparatus yet does not retain much heat created by compression of the shock absorber.
  • Another object of the present invention is to provide a shock absorber arrangement which reduces internal heat buildup during repeated cycles.
  • Another object of the invention is to provide a shock absorber arrangement in which the UFE of the shock absorber is extended when used in rapid cycle operations.
  • a shock absorber arrangement for fastener driving apparatus comprising a fastener driving member mounted for reciprocating movement in a housing and a shock absorber element disposed in said housing to arrest said driving member at a predetermined point of said movement characterised in that said element is so shaped and is mounted in such manner that when arresting said driving member said element distorts primarily by bending and/or deflecting.
  • fastener driving apparatus characterised by said shock absorber arrangement.
  • a shock absorber 15 is disposed within a pneumatic fastener driving apparatus shown generally as 16.
  • a driver 17 is attached to a piston 18 which is powered downward by compressed air applied to the upper side thereof, through a suitable valve means.
  • the actuation of the value means has no relation to the present invention except to provide a rapid downward movement of the piston, a typical example is described in British Patent No. 1,087,183 in the name of Umberto Monacelli.
  • the fasteners shown in the illustrations are nails assembled as a strip although staples, pins, tacks and the like could be used depending on the particular tool involved.
  • the leading fastener 20 of the assembly is moved into a driving throat 21 by a pusher means (not shown) after each cycle of the tool.
  • the driving throat 21 is disposed within a portion 22 of the tool body 16 and is substantially on the same axis as the piston 18 and the cylinder 23.
  • the driving throat 21 and driver 17 are illustrated as being circular but of course could be rectangular or of other shape depending on the fastener being utilized.
  • a typical operating cycle will now be described referring to Figure 1 and Figure 2.
  • the tool is positioned against a workpiece and a trigger is actuated to start the cycle.
  • a power valve means opens allowing compressed air to reach the top of the cylinder 22 above the piston 18.
  • the piston 18 and driver 17 attached thereto start a rapid downward movement.
  • the end of the driver 17 contacts the fastener 20 and drives it downward through the driving throat 21.
  • the fastener 20 is separated from the rest of the fastener assembly as it moves towards the- workpiece.
  • the driver l7 and piston 18 decelerate due to the resistance to the fastener 20 entering the workpiece.
  • the underside of the piston 18 strikes the top portion 24 of the shock absorber 15.
  • the force the shock absorber 15 must withstand will vary. The greatest shock of course is when the fastener has not entered into the driving throat 21 due to a jam, or the tool has run out of fasteners and the shock absorber must withstand the full force of the piston.
  • the piston 18 and driver 17 return to. the upper rest position. As the end of the driver 17 clears the fastener assembly, the next fastener moves into the driving throat 21.
  • the shock absorber 15 being generally circular in shape is supported on an external circumferential surface 28 by the cylinder 23 for the purpose of centrally positioning the shock absorber 15 within the tool.
  • the shock absorber 15 is also supported vertically by its lower surface 29 resting on a conical surface 30 located in the base portion 22 of the tool 16. Although the conical surface 30 is deep, the surface 29 rests on only the outer edge thereof.
  • the bottom surface 31 of the shock absorber 15, substantially transverse to the driver 17, is unsupported.
  • a void 32 is provided within the central portion of the shock absorber 15 to allow movement of the driver 17 therethrough.
  • An upper surface 24 of the shock absorber 15 is contacted by the underside of the piston 18 during the downward stroke.
  • the shape of the underside of the piston 18 is designed to provide a large external guiding surface 33 in contact with the cylinder 23 yet reduce the overall height of the tool below that which could be obtained with a solid flat piston.
  • the external portion 34 of the shock absorber 15 is conical so as to match the outer portion 35 of the piston 18.
  • Figure 4 shows the shock absorber 15 in a deflected condition with the piston 18 having come to a full stop. As the force from the piston 18 is applied to the top surface 24, the shock absorber 15 deflects both inwardly and downwardly as opposed to pure direct compression as in previous tools of this nature.
  • the present shock absorber may also compress slightly depending on the composition of the flexible material from which it is made.
  • the conical shape of the void 32 is to provide clearance for the p 0 rtion _36 on the piston 18 and portion 37 of the piston base 22 as the void 32 changes shape during the inward deflection.
  • the region 40 created between the conical surface 30 and the surface 31 is normally vacant in "at rest” position and provides space for the lower portion of the shock absorber 15 to enter during deflection without compression.
  • the dimensional relationships can be seen that provide for deflection of the shock absorber 15 rather than compression when a force is applied to the top surface 25 thereof.
  • the surface 29 that rests on a portion of conical surface 30 has a minor circumferential edge 38 where surface 29 meets surface 31.
  • the top surface 24 has a minor circumferential edge 39 being the innermost part which is contacted by the underside of the piston 18 and having a diameter A less than diameter B of circumferential edge 38. Both surfaces 24 and 29 may also have major circumferential edges or may gradually merge into surfaces 34 and 28 respectively.
  • the surface 29 may extend transversely of the driver 17.
  • the advantage of the invention is still achieved provided the minor circumferential edge 38 is larger than that of edge 39.
  • the center void may also be a straight-through bore depending on the configuration of the piston 18 and body portion 20.
  • the shock absorber element may be made from any suitable material such as neoprene, Vulcolon or another synthetic plastics material. It may have a Durometer hardness of 75 to 80.
  • shock absorber element instead of fixing the shock absorber element in the cylinder, it is of course equally possible to mount the same on the piston or other part of the movable fastener driving member.
  • the element may also have other configurations that that illustrated. It could for example be constructed as a hollow element deflectable into an internal cavity thereof, and it could be constituted by a plurality of separate pieces.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
EP84113747A 1983-11-14 1984-11-14 Puffervorrichtung für Eintreibgerät von Befestigungsmitteln Withdrawn EP0147601A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08330323A GB2149712A (en) 1983-11-14 1983-11-14 Shock absorber arrangements for use in fastener driving apparatus
GB8330323 1983-11-14

Publications (1)

Publication Number Publication Date
EP0147601A1 true EP0147601A1 (de) 1985-07-10

Family

ID=10551720

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84113747A Withdrawn EP0147601A1 (de) 1983-11-14 1984-11-14 Puffervorrichtung für Eintreibgerät von Befestigungsmitteln

Country Status (2)

Country Link
EP (1) EP0147601A1 (de)
GB (1) GB2149712A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3831864A1 (de) * 1988-09-20 1990-03-22 Paslode Gmbh Ringfoermiger prellpuffer fuer befestigungsmittel-eintreibgeraete
EP0661140A1 (de) * 1993-12-03 1995-07-05 Kanematsu-Nnk Corporation Eintreibewerkzeug für Befestigungsmittel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969989A (en) * 1973-08-02 1976-07-20 Karl M. Reich Maschinenfabrik Gmbh Impact buffer for impact drive tools
DE3152497A1 (de) * 1981-05-20 1983-02-03 Joh. Friedrich Behrens AG, 2070 Ahrensburg Schallgedaempftes eintreibgeraet fuer befestigungsmittel
DE3227855A1 (de) * 1982-07-26 1984-01-26 Hilti AG, 9494 Schaan Druckluftnagler

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2510858C2 (de) * 1975-03-12 1987-01-08 Signode Corp., Glenview, Ill. Einrichtung zum Abfangen des Schlagkolbens eines pneumatisch betätigbaren Eintreibwerkzeugs
DE3047662C2 (de) * 1980-12-18 1985-02-21 Karl M. Reich Maschinenfabrik GmbH, 7440 Nürtingen Puffersystem bei Einschlaggeräten
DE3120346A1 (de) * 1981-05-22 1982-12-09 Gardisette Holding Verkaufshilfe zum lagern und vorfuehren von haengenden gardinen bzw. vorhaengen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969989A (en) * 1973-08-02 1976-07-20 Karl M. Reich Maschinenfabrik Gmbh Impact buffer for impact drive tools
DE3152497A1 (de) * 1981-05-20 1983-02-03 Joh. Friedrich Behrens AG, 2070 Ahrensburg Schallgedaempftes eintreibgeraet fuer befestigungsmittel
DE3227855A1 (de) * 1982-07-26 1984-01-26 Hilti AG, 9494 Schaan Druckluftnagler

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3831864A1 (de) * 1988-09-20 1990-03-22 Paslode Gmbh Ringfoermiger prellpuffer fuer befestigungsmittel-eintreibgeraete
EP0661140A1 (de) * 1993-12-03 1995-07-05 Kanematsu-Nnk Corporation Eintreibewerkzeug für Befestigungsmittel

Also Published As

Publication number Publication date
GB8330323D0 (en) 1983-12-21
GB2149712A (en) 1985-06-19

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): DE FR GB IT NL SE

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19860311