US3828656A - Annular piston stop structure - Google Patents

Annular piston stop structure Download PDF

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Publication number
US3828656A
US3828656A US00325263A US32526373A US3828656A US 3828656 A US3828656 A US 3828656A US 00325263 A US00325263 A US 00325263A US 32526373 A US32526373 A US 32526373A US 3828656 A US3828656 A US 3828656A
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US
United States
Prior art keywords
piston
annulus
cylinder
stroke
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.)
Expired - Lifetime
Application number
US00325263A
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English (en)
Inventor
F Biddle
C Becht
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.)
Senco Products Inc
Original Assignee
Senco Products Inc
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 Senco Products Inc filed Critical Senco Products Inc
Priority to US00325263A priority Critical patent/US3828656A/en
Priority to DE19732344163 priority patent/DE2344163C3/de
Priority to GB4148973A priority patent/GB1408809A/en
Priority to JP48108096A priority patent/JPS5229471B2/ja
Priority to BR7590/73A priority patent/BR7307590D0/pt
Priority to NL737313993A priority patent/NL152787B/xx
Application granted granted Critical
Publication of US3828656A publication Critical patent/US3828656A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B25C1/044—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure with movable main cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B23/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01B23/06—Adaptations for driving, or combinations with, hand-held tools or the like

Definitions

  • Fluid actuated fastener driving devices include a working cylinder within which a piston reciprocates. When suitable fluid power, such as for example air under pressure, is admitted, the piston is driven rapidly downward in a working stroke.
  • the piston carries a fastener driver which is effective during the working stroke to drive a fastener fully into a work piece.
  • the resilient stop is divided into two parts with one part being disposed at the bottom of the cylinder and the other part being secured to the underside of the piston.
  • This arrangement has many advantages with certain types of fluid actuated fastener driving devices; but because of the thicknesses of the two resilient members, the height of the tool is of necessity a bit greater.
  • the main objection to this structure is that the mass of the piston is substantially increased, and this results in decreased performance.
  • the structure of said application would not be appropriate for situations where a relatively small tool is involved and it is desired to minimize the height of the tool.
  • annular resilient piston stop which in some instances may serve as the sole element for stopping the piston, but which in other tools of larger capacity and greater energy may serve as an assist to a resilient bottom stop member.
  • the invention contemplates the provision of an annulus of resilient material secured to the cylinder wall adjacent the bottom of the cylinder and extending slopingly radially inward into said cylinder into a position where it interferes with said piston as the latter nears the bottom of its stroke. It will be understood that where the piston is a relatively low energy piston, such an annulus alone may suffice to stop the piston in a very short distance, while with a high energy piston the collar or annulus may serve as an assist to a resilient stop against which the piston abuts at the end of its stroke.
  • the invention will be explained primarily in its action as a stop assist in a very high energy fastening tool since this is a much more complex problem.
  • FIG. 1 is a fragmentary cross sectional view of a fastener driving device showing the position of the parts when the piston is near the end of its down stroke.
  • FIG. 2 is a view similar to FIG. 1 showing the position of the parts at the beginning of the return stroke.
  • the tool comprises a head portion indicated generally at 10, a rearwardly extending handle portion indicated generally at 12, a nose piece or guide body indicated generally at 14, a magazine structure indicated generally at 16 and a manually actuated trigger 18.
  • a main working cylinder sleeve indicated generally at 20 Slidable within the cylinder sleeve is the piston indicated generally at 22.
  • the piston has secured to it a fastener driver 24 by means of which the fasteners will be driven into the work.
  • the magazine 16 is loaded with a supply of fasteners in strip form, and the fasteners are urged by the magazine toward an internal passage or drive track 14a in the nose piece of the tool. It will be understood that with the piston in its up position, the lowermost end of the driver 24 will be disposed slightly above the head of the fastener which is positioned in the drive track 14a.
  • Plenum type return systems for fastener driving tools are disclosed in detail in US Pat. No. RE. 26,262 in the name of A. G. Juilfs, dated Sept. 5, 1967 and entitled Portable Stapler With Pneumatic Drive and Return.
  • the specific valving structure and return operation of the device shown in this application are explained in detail in the copending application Ser. No. 210,812 referred to above.
  • the piston is provided with an annular groove 30 within which an O-ring 32 is seated for the purpose of maintaining a sealing relationship with the cylinder sleeve 20 during both the drive and return strokes.
  • the driver assembly is secured to the piston in any conventional manner.
  • the cylinder 20 also constitutes a main valve.
  • the housing 10 has an internal annular valve seat 32 and the cylinder 20 has a projection 34 having a groove to seat a resilient valve member 50.
  • the piston will be driven downwardly in its driving stroke.
  • the sleeve 20 will be caused to move downwardly to the position of FIG.
  • a conventional resilient bottom stop member is provided at 40 and is secured to the bottom of the housing 10 by the flange 42 formed in the bottom of the housing.
  • Secured in the cylinder wall 20 is the resilient annulus 44.
  • the annulus 44 has an annular flange which is seated in the groove 44a formed on the inside of the cylinder.
  • the element 44 is more or less wedge-shaped, and extends radially inwardly in the path of the piston slopingly so that it interferes with the movement of the piston. It will be observed that the lower edge of the piston is rounded for cooperation with the annulus 44.
  • the annulus 44 immediately begins to slow down the piston at about the instant that it abuts the annular resilient stop 40 and therefore assists the latter in bringing the piston to a stop. During this slow down period, and until the piston reaches the end of its stroke, the upward bias on the cylinder, and therefore on the annulus, is being maintained. It must be noted that in addition to the downward wedging action produced by the piston, there is The assist annulus 44 not only assists the bottom stop 40 in bringing the piston to rest, but takes some of the impact off the bottom stop 40 and therefore contributes to the longevity of the latter.
  • a fastener applying device having a cylinder, a piston reciprocable in said cylinder, a piston stop structure for said piston, a fastener driver, and means for moving said piston and fastener driver in a driving stroke to drive a fastener into a work piece;
  • said piston stop structure comprising:
  • said annulus being generally wedge-shaped in cross section, and extending slopingly, radially into said stop element is fixedly mounted adjacent the lower end of said cylinder, and said annulus assists said bottom stop element in bringing said piston to rest.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Actuator (AREA)
US00325263A 1973-01-22 1973-01-22 Annular piston stop structure Expired - Lifetime US3828656A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00325263A US3828656A (en) 1973-01-22 1973-01-22 Annular piston stop structure
DE19732344163 DE2344163C3 (de) 1973-01-22 1973-09-01 Abfangeinrichtung für den Arbeitskolben eines pneumatischen Eintreibwerkzeugs
GB4148973A GB1408809A (en) 1973-01-22 1973-09-04 Fastener applying device having an annular piston stop structure
JP48108096A JPS5229471B2 (enrdf_load_stackoverflow) 1973-01-22 1973-09-27
BR7590/73A BR7307590D0 (pt) 1973-01-22 1973-09-28 Estrutura aperfeicoada de batente para pistao de dispositivos aplicadores de fixadores
NL737313993A NL152787B (nl) 1973-01-22 1973-10-11 Inrichting voor het in een werkstuk drijven van bevestigingsmiddelen.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00325263A US3828656A (en) 1973-01-22 1973-01-22 Annular piston stop structure

Publications (1)

Publication Number Publication Date
US3828656A true US3828656A (en) 1974-08-13

Family

ID=23267136

Family Applications (1)

Application Number Title Priority Date Filing Date
US00325263A Expired - Lifetime US3828656A (en) 1973-01-22 1973-01-22 Annular piston stop structure

Country Status (5)

Country Link
US (1) US3828656A (enrdf_load_stackoverflow)
JP (1) JPS5229471B2 (enrdf_load_stackoverflow)
BR (1) BR7307590D0 (enrdf_load_stackoverflow)
GB (1) GB1408809A (enrdf_load_stackoverflow)
NL (1) NL152787B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0765715A1 (en) * 1995-09-29 1997-04-02 Illinois Tool Works Inc. Combustion-powered, fastener-driving tool
US5617925A (en) * 1995-06-05 1997-04-08 Sencorp Assembly for decelerating a driver in a tool
US20030071105A1 (en) * 2001-10-15 2003-04-17 Hwai-Tay Lin Abrasion-resistant bumper for a nail-driving tool
US20100252676A1 (en) * 2009-04-02 2010-10-07 Raytheon Company Method and apparatus for ram deceleration in a launch system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5875678U (ja) * 1981-11-12 1983-05-21 日立工機株式会社 打込機
JPS62117083U (enrdf_load_stackoverflow) * 1986-01-17 1987-07-25

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2821170A (en) * 1955-05-02 1958-01-28 Robin A Jacobus Stapler
US3338141A (en) * 1965-07-16 1967-08-29 Olin Mathieson Power-actuated piston tool
US3496840A (en) * 1968-01-29 1970-02-24 Fastener Corp Fastener driving apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2821170A (en) * 1955-05-02 1958-01-28 Robin A Jacobus Stapler
US3338141A (en) * 1965-07-16 1967-08-29 Olin Mathieson Power-actuated piston tool
US3496840A (en) * 1968-01-29 1970-02-24 Fastener Corp Fastener driving apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5617925A (en) * 1995-06-05 1997-04-08 Sencorp Assembly for decelerating a driver in a tool
EP0765715A1 (en) * 1995-09-29 1997-04-02 Illinois Tool Works Inc. Combustion-powered, fastener-driving tool
US5722578A (en) * 1995-09-29 1998-03-03 Illinois Tool Works Inc. High velocity, combustion-powered, fastener-driving tool
US5806747A (en) * 1995-09-29 1998-09-15 Illinois Tool Works Inc. High velocity, combustion-powered, fastener-driving tool
US5975397A (en) * 1995-09-29 1999-11-02 Illinois Tool Works, Inc. High velocity, combustion-powered, fasterner-driving tool
US20030071105A1 (en) * 2001-10-15 2003-04-17 Hwai-Tay Lin Abrasion-resistant bumper for a nail-driving tool
US6779698B2 (en) * 2001-10-15 2004-08-24 Hwai-Tay Lin Abrasion-resistant bumper for a nail-driving tool
US20100252676A1 (en) * 2009-04-02 2010-10-07 Raytheon Company Method and apparatus for ram deceleration in a launch system
WO2011002479A1 (en) * 2009-04-02 2011-01-06 Raytheon Company Ram deceleration in a launch system
US8181906B2 (en) 2009-04-02 2012-05-22 Raytheon Company Method and apparatus for ram deceleration in a launch system

Also Published As

Publication number Publication date
NL7313993A (enrdf_load_stackoverflow) 1974-07-24
DE2344163B2 (de) 1976-04-15
JPS5229471B2 (enrdf_load_stackoverflow) 1977-08-02
DE2344163A1 (de) 1974-08-01
BR7307590D0 (pt) 1974-09-24
NL152787B (nl) 1977-04-15
JPS49104275A (enrdf_load_stackoverflow) 1974-10-02
GB1408809A (en) 1975-10-08

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