US3496835A - Control system for a pneumatically operated air inlet valve - Google Patents

Control system for a pneumatically operated air inlet valve Download PDF

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Publication number
US3496835A
US3496835A US625666A US3496835DA US3496835A US 3496835 A US3496835 A US 3496835A US 625666 A US625666 A US 625666A US 3496835D A US3496835D A US 3496835DA US 3496835 A US3496835 A US 3496835A
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US
United States
Prior art keywords
piston
air
valve
inlet valve
operating
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
US625666A
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English (en)
Inventor
Carl Siegmann
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
Application granted granted Critical
Publication of US3496835A publication Critical patent/US3496835A/en
Anticipated expiration legal-status Critical
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    • 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
    • B25C1/041—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure with fixed main cylinder

Definitions

  • the prior art discloses a control system for a pneumatically operated air inlet valve of a pneumatic driving apparatus for nails, staples and the like for the automatic repetition of the operating cycles comprising operating stroke and return stroke, of the driving piston after initial Opening of the air inlet valve constructed as differential piston cylinder unit by varying the air pressure acting on the larger valve piston surface and by using the operating air for closing the air inlet valve.
  • Such a control system permits the repeated driving-in of the aforementioned fastening means into the workpiece without requiring a separate actuation by the operator for each driving operation.
  • the object of the invention is to simplify the aforementioned control method and of the control devices already proposed in this context.
  • the working air used for closing the air inlet valve represents part of the compressed air stored intermediately in known manner for the piston return and is supplied directly to a valve piston surface acting in the closing sense, the said surface being larger than the opening piston surface and being in constant communication with the air return storage chamber.
  • the air inlet valve is automatically closed against the resistance of the fresh working air acting upon the (smaller) opening piston surface so that the working cylinder chamber disposed above the working piston is vented in known manner and the piston is returned by the intermediately stored air.
  • the control apparatus according to the invention for performing the control method proposed herein is based on a pneumatically operated driving-in apparatus for 3,496,835 Patented Feb. 24, 1970 "ice nails, staples and the like in whose operating cylinder the operating piston executes a working stroke when the air inlet valve is opened and executes a return stroke when the said valve is closed, the cylinder chamber disposed above the working piston being in communication with atmospheric air when the air inlet valve is in the closed position and the return stroke of the operating piston is applied under the effect of compressed air which is stored on completion of the working stroke in an air storage chamber constantly in communication with the cylinder chamber disposed below the working piston, the pneumatically operated air inlet valve having a differential piston onto whose smaller active surface the operating air pressure act constantly while the said operating compressed air reaches the larger active surface only by operating an actuating valve.
  • a compressed air duct is provided which constantly connects the air storage chamber with the larger valve piston surface.
  • a valve piston section will advantageously be provided with an even larger piston surface which is in constant communication via the compressed air duct with the air storage chamber and acts in the closing sense of the air inlet valve.
  • the invention accordingly provides that the compressed air duct constantly connects the air storage chamber with the larger valve piston surface if the operating valve is in its working condition while this connection is interrupted with the operating valve in the condition of rest.
  • the invention is illustrated in the drawing showing a cross-section of a staple driving apparatus with an air inlet valve of the first-mentioned kind.
  • the working cylinder 1 has disposed in it in known manner a reciprocating working piston 2 which, with the driver 3 (and with each operating stroke) drives a staple, supplied from the magazine 4, which is only indicated, into a workpiece.
  • the cylinder 1 is surrounded by an air storage chamber 5 which is in constant communication via the bores 6 with the cylinder space disposed below the piston 2.
  • compressed air which reaches the top of the piston 2, held in its position at rest by the magnet 7 in a manner to be described hereinafter, passes through the openings 8 into the storage chamber 5 where a certain quantity of such air is intermediately stored. If the pressure of the working air has dropped sufficiently during venting of the cylinder chamber above the piston 2, the said piston will be moved back by the stored air transferred into the cylinder 1 through the bores 6.
  • the piston section 15 is non-positively connected via the intermediate member 17 and the shank 18 to the valve disc 11 and together with the said valve disc forms a differential piston, the active surface 16 of the piston section 15 being larger than the active surface 19 of the valve disc 11.
  • the operating valve 12 If the operating valve 12 is opened by pulling upward of the manual trigger 20, air will pass from the hollow chamber 10 to the piston surface 16 of the valve piston section 15 while the venting system of the operating valve will be closed in the manner disclosed in the drawing. Owing to the larger active surface 16 of the piston section 15 relative to the active surface 19 of the valve disc 11, the shank 18 with the valve disc 11 will be moved upwardly whereupon initially the connection between the inlet duct 13 and the venting pipe 14 Will be interrupted and whereupon operating air flows past the valve disc 11 through the inlet duct 13 into the upper chamber of the cylinder 1 on to which the piston 2 acts and thus initiates the working stroke of the said piston.
  • the invention proposes a further valve piston 21 which is slidable in a housing 22 surmounted on the apparatus and whose operating direction corresponds to that of the valve disc 11.
  • the said valve piston is mounted on the shank 18 with its tappet 23 it may also be regarded as a further section of the differential valve piston. Its active surface 24 is still larger than the oppositely acting surface 16 of the piston section 1.
  • the space above the piston surface 24 is in communication via a compressed air duct 25, an annular duct 26 and various extending bores or ducts 27 in the housing 22 or its screw cap 28 with the air storage chamber 5.
  • a compressed air duct 25 As soon as working air flows through the openings 8 towards the end of the working stroke and thus fills the air storage chamber 5, part of this compressed air will flow through the ducts 25, 26 and 27 into the interior of the housing 22 to act on the surface 24 of the valve section 21. Since the piston surface 24 is larger than the oppositely acting surface 16 of the piston section 15, the air inlet valve will be pressed into the closing position (although the air disposed below the valve piston surface 16 is pressed back along the shank of the operating valve 12 into the hollow chamber, the said operating valve 12 continuing to remain in the open position).
  • the positive closing of the air inlet valve causes the cylinder chamber above the operating piston 2 to be vented via the inlet duct 13 and the venting pipe 14 so that the operating piston 2 is moved back into its upper starting position by the force exerted by the compressed air intermediately stored in the air storage chamber 5.
  • the stored compressed air which main tains the air inlet valve above the piston section 21 in the closed position, is expanded and together with the pressure in the air storage chamber the pressure acting on the surface 24 of the valve piston section 21 also drops (in actual fact, immediately after the operating piston 2 is lifted off the buffer 29, the residual compressed air may escape along the driver 3 to atmosphere, but owing to the kinetic energy imparted to it, the piston reaches its upper limiting position very rapidly).
  • the duct system 26/27 is closed in a suitable manner while at the same time the chamber above the piston surface 24 is connected to the atmospheric air.
  • a pneumatic fastener applying device including a cylinder and a piston movable therein in a cycle consisting of a working stroke and a return stroke, means pro viding an air storage chamber communicating with said cylinder adjacent the end toward which said piston moves on its working stroke, an inlet valve, an inlet air chamber for working air under pressure, said inlet chamber communicating with said inlet valve whereby air under pressure impinges against said inlet valve, said inlet valve comprising a differential piston having piston surfaces to which air under pressure is selectively directed for opening or closing said inlet va ve, air passage means interconnecting said inlet valve and said cylinder opposite said storage chamber to supply working air to said piston for said working stroke upon movement of said inlet valve, a manually operable pilot valve in fluid communication with said inlet valve for admitting air under pressure to one piston surface of said inlet valve to effect shifting thereof in one direction to admit working air under pressure from said inlet chamber to said piston for effecting said working stroke, and fluid passage means from said storage chamber to said inlet valve and supplying air under pressure

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Dovetailed Work, And Nailing Machines And Stapling Machines For Wood (AREA)
US625666A 1966-04-02 1967-03-24 Control system for a pneumatically operated air inlet valve Expired - Lifetime US3496835A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB0086494 1966-04-02

Publications (1)

Publication Number Publication Date
US3496835A true US3496835A (en) 1970-02-24

Family

ID=6983391

Family Applications (1)

Application Number Title Priority Date Filing Date
US625666A Expired - Lifetime US3496835A (en) 1966-04-02 1967-03-24 Control system for a pneumatically operated air inlet valve

Country Status (10)

Country Link
US (1) US3496835A (de)
AT (1) AT266729B (de)
BE (1) BE696055A (de)
CH (1) CH462066A (de)
DE (1) DE1603712C3 (de)
DK (1) DK124379B (de)
ES (1) ES338534A1 (de)
GB (1) GB1185654A (de)
NL (1) NL149410B (de)
SE (1) SE309758B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3638532A (en) * 1969-06-30 1972-02-01 Fastener Corp Fastener driving tool
US3683746A (en) * 1970-06-25 1972-08-15 Fastener Corp Fastener driving tool
US3800662A (en) * 1972-08-18 1974-04-02 Ackley Mfg Co Fluid operated reciprocating motor
US3929056A (en) * 1972-05-17 1975-12-30 Haubold Ind Nagelgeraete D Stapler release safety mechanism
US4275642A (en) * 1978-09-22 1981-06-30 Xomox Corporation Air actuated fail-safe actuator encapsulated within accumulator tank
US4344555A (en) * 1980-02-19 1982-08-17 Signode Corporation Self-cycling pneumatic fastener applying tool
US20070261546A1 (en) * 2006-05-09 2007-11-15 Samson Power Tool Co., Ltd. Switch mechanism for trigger of pneumatic tools

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US622576A (en) * 1899-04-04 Daniel shaw waugh
US653247A (en) * 1899-10-16 1900-07-10 Henry James Kimman Pneumatic hammer.
US712438A (en) * 1901-07-25 1902-10-28 Charles Henry Shaw Pneumatic hammer.
US1018983A (en) * 1911-06-26 1912-02-27 Livingston Mfg Company Pneumatic tool.
US1494030A (en) * 1921-07-20 1924-05-13 Ingersoll Rand Co Impulse-actuated rock drill
US3278104A (en) * 1965-09-14 1966-10-11 Senco Products Fastener applying device
US3278103A (en) * 1965-04-06 1966-10-11 Senco Products Fastener applying device
US3278102A (en) * 1963-11-05 1966-10-11 Senco Products Device for driving fasteners
US3301139A (en) * 1964-09-29 1967-01-31 Speedfast Corp Pressure air actuated tool and valve structure for use therewith
US3353453A (en) * 1965-05-21 1967-11-21 Fastener Corp Fastener driving tool

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US622576A (en) * 1899-04-04 Daniel shaw waugh
US653247A (en) * 1899-10-16 1900-07-10 Henry James Kimman Pneumatic hammer.
US712438A (en) * 1901-07-25 1902-10-28 Charles Henry Shaw Pneumatic hammer.
US1018983A (en) * 1911-06-26 1912-02-27 Livingston Mfg Company Pneumatic tool.
US1494030A (en) * 1921-07-20 1924-05-13 Ingersoll Rand Co Impulse-actuated rock drill
US3278102A (en) * 1963-11-05 1966-10-11 Senco Products Device for driving fasteners
US3301139A (en) * 1964-09-29 1967-01-31 Speedfast Corp Pressure air actuated tool and valve structure for use therewith
US3278103A (en) * 1965-04-06 1966-10-11 Senco Products Fastener applying device
US3353453A (en) * 1965-05-21 1967-11-21 Fastener Corp Fastener driving tool
US3278104A (en) * 1965-09-14 1966-10-11 Senco Products Fastener applying device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3638532A (en) * 1969-06-30 1972-02-01 Fastener Corp Fastener driving tool
US3683746A (en) * 1970-06-25 1972-08-15 Fastener Corp Fastener driving tool
US3929056A (en) * 1972-05-17 1975-12-30 Haubold Ind Nagelgeraete D Stapler release safety mechanism
US3800662A (en) * 1972-08-18 1974-04-02 Ackley Mfg Co Fluid operated reciprocating motor
US4275642A (en) * 1978-09-22 1981-06-30 Xomox Corporation Air actuated fail-safe actuator encapsulated within accumulator tank
US4344555A (en) * 1980-02-19 1982-08-17 Signode Corporation Self-cycling pneumatic fastener applying tool
US20070261546A1 (en) * 2006-05-09 2007-11-15 Samson Power Tool Co., Ltd. Switch mechanism for trigger of pneumatic tools

Also Published As

Publication number Publication date
ES338534A1 (es) 1968-04-01
SE309758B (de) 1969-03-31
AT266729B (de) 1968-11-25
DE1603712B2 (de) 1975-01-02
CH462066A (de) 1968-08-31
DE1603712C3 (de) 1975-08-07
DK124379B (da) 1972-10-16
BE696055A (de) 1967-09-25
GB1185654A (en) 1970-03-25
DE1603712A1 (de) 1970-08-27
NL6703163A (de) 1967-10-03
NL149410B (nl) 1976-05-17

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