US2983922A - Portable stapler with pneumatic drive and return - Google Patents

Portable stapler with pneumatic drive and return Download PDF

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Publication number
US2983922A
US2983922A US809129A US80912959A US2983922A US 2983922 A US2983922 A US 2983922A US 809129 A US809129 A US 809129A US 80912959 A US80912959 A US 80912959A US 2983922 A US2983922 A US 2983922A
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United States
Prior art keywords
piston
air
cylinder
driver
reservoir
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US809129A
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English (en)
Inventor
Albert G Juilfs
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Senco Products Inc
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Senco Products Inc
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Priority to US809129A priority Critical patent/US2983922A/en
Priority to BE582426A priority patent/BE582426A/fr
Priority to CH7831759A priority patent/CH387569A/de
Application granted granted Critical
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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
    • B25C1/041—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure with fixed main cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31576—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and a single output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41581—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/421—Flow control characterised by the type of actuation mechanically
    • F15B2211/424—Flow control characterised by the type of actuation mechanically actuated by an output member of the circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5153—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/72—Output members, e.g. hydraulic motors or cylinders or control therefor having locking means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/77—Control of direction of movement of the output member
    • F15B2211/7716—Control of direction of movement of the output member with automatic return
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S91/00—Motors: expansible chamber type
    • Y10S91/04—Magnets

Definitions

  • This invention resides in the provision of a power operated device in which uid power is used both to actuate a piston on a work performing stroke and also to return the piston in preparation for a succeedingstr'oke, all with a minimum use of fluid power, means other than uid whereafter the piston will be held in such initial position by means other than air and the air will not be used to maintain the driverl in such initial position.
  • Another important object of this invention is to provide a'portable stapler with means for storing air as the staple driver and its actuating piston move in a staple driving direction in such a manner that the air thus stored on the driving stroke may be used to aid return of the driver and piston for the next driving stroke.
  • a further object of this invention is to provide a portable stapler which uses a minimum amount of air even though the driver actuating piston is both driven and returned by air.
  • a very important object of this invention is to provide an air operated device in which a piston is both driven and returned by air without the need for or use of a return spring for the piston.
  • Another important object of this invention is to provide an air operated device in which a piston is reciprocated in a cylinder by air pressure alone and wherein the length of the cylinder is kept to a minimum.
  • a specific object of this invention is to provide a portable pneumatic stapler in which a piston and driver are air actuated to drive a staple and in which the driver and piston are returned without a driver return spring, all with the use of a minimum amount of air.
  • Another specic object of this invention is to provide a portable pneumatic stapler in which the height of the stapler (the distancetfrom the tip of the staple discharge nose to the top of the cylinder) is equal to or less than that of comparable staplers in which a spring is used to return the piston and driver, and in which this stapler height is markedly less than that of other comparable Staplers in which the piston and driver are returned by air.
  • a very important object of this invention is to provide a relatively small portable pneumatic stapler which may be used on production line work to do the same jobs now performed by larger tools, which novel small stapler is substantially trouble free and extremely economical to operate.
  • Figure l is a cross-sectional view of the stapler embodying this invention, the section -being taken on the line 1-1 of Figure 4,
  • Y v Y v Figure 2 is a fragmentary sectional view showing the position of certain of the driving mechanism during the driving stroke,
  • Figure 3 is a further fragmentary cross-sectional view showing a dierent stage inthe driving stroke and indicating also a possible modification
  • Figure 4 is a front view of the stapler embodying this invention, particularly as seen from the left hand side of Figure 5, f
  • FIG. 5 is a side elevation, with parts broken away and parts in section, of the stapler embodying this invention.
  • Figure 6 is a top view of the stapler shown in Figure- 5
  • Figure 7 is a side elevation, with parts? broken away and parts in section, of a modification of the invention.
  • Figure 8 is a fragmentary side elevation, with parts broken away andparts in section, of another modification of this invention, Y
  • FIG 9 is a fragmentary top view of the modification shown in Figure 8.
  • Figure l0 is a fragmentary sectional view showing one of the forms of this invention.
  • Figure 11 is a fragmentary sectional view showing an other of the forms of this invention
  • Figure 12 is a fragmentary sectional View showing a further modication of this invention.
  • this invention comprises driving a piston by iluid power from a retracted position within a cylinder to a piston travel limiting means, returning the piston to its retracted position by iluid power applied in the region of said travel limiting means, and releasably holding the piston in retracted position by means other than fluid power.
  • This may be accomplished by using a source of fluid power to overcome the releasable holding means and to drive the piston from its retracted position to the travel limiting means, diverting the source of fluid power to return the piston to itsretracted position while relieving the piston from the initial influence of the lluid power used on the drive stroke, and holding said piston in retracted position by said releasable means while relieving the piston from further influence by the iluid power used on the return stroke.
  • the piston is moved on its drive stroke by air from a source of compressed air introduced in the region of said releasable holding means. Afterrsaid piston is ythus driven to its said stop compressed air is no longer introduced in the region of said releasable holding means.
  • the region of the cylinder above the piston is open to exhaust and compressed air is hintroduced below said piston in the region ofsaid stop. This returns the piston 'to retracted position and engagement with said releasable holding means. In the retracted position of said piston the region of the cylinder below said piston is open to exhaust and compressed air is no longer introduced in the region of said stop.
  • the stapler is illustrated as including a handle-section 21. a main body 22 and a nose section 23. A portion of-the means for feeding a succession of staples into the nose section 23 is generally indicatedat 24.
  • the staple feed means is conventional and does not form a part of this invention; there are several satisfactory staple feed-means available for this purpose.
  • the handle 21 includes a large air chamber 25 and a conventional connectionv 26 to a suitable supply of air under pressure.
  • ⁇ Fixed within the main body 22 is, in this form of the .4 invention, ,asleeve27 which has va threaded portion 28 near its upper end which engages the internal threads 29 at the upper end of the body section 22.
  • the sleeve 27 is screwed into the body section 22 until the lower end comes to rest on the shoulder 30 provided in the lower end of the main body section 22.
  • a resilient bumper 31 mounted in the lower end of this main body section 22 is mounted in the lower end of this main body section 22 which is relieved about its periphery as indicated at 32.
  • the upper end of the main body section 22 is closed by a cap 33 having suitable threads to engage the threads 29.
  • the cap 33 has a sleeve 34 fixed thereto and within this sleeve there is secured a magnet 35.
  • the magnet 35 extends slightly below the lower edge of the cap 33 and particularly of the sleeve 34.
  • a metal piston 36 Slidably mounted within the cylinder sleeve 27 is a metal piston 36 to which is rmly secured a staple driver 37.
  • the driver 37 is connected to the piston 36 by means of a pin 38.
  • the piston 36 be cup-shaped and lled with a hard, tough but light and resilient material 39. This material is relieved at 40 so that the driver may have some lateral movement or wobble on the pin 38.
  • FIG. l In the form of the invention illustrated in Figure l there is an air storage chamber 42 defined by the cylinder sleeve 27 and main body section 22. Ports 43 in the lower end of the sleeve 27. communicate with this chamber 42. These ports are open. Also-located inthe sleeve 27 are one or more other ports 44 which are normally closed by resilient means 45. Each of these ports 44-45, therefore, constitutes a one-way or non-return valve.
  • valve means now to be described.
  • the particular valve means shown are the subject matter of another application for patent led by this inventor of even 'dateherewith and entitled Remote Control Air Valves,'Serial No. '819,387. Insofar as the instant invention is concerned this particular valve mechanism is not critical. Any workable valve mechanism which will introduce air under pressure about the piston 36 will suiice. For the sake of completeness, however, a brief description of the valve mechanism shown follows. It is to be understood-and emphasized-however, that the instant invention--the subject matter of this application- Yis-directed to the means for returning the piston and driver 'chamber 52.
  • a firing valve cylinder 53 andra pair of closure plugs 54 and 55 are also in the handle of the gun.
  • a trigger piston 56 is slidable in the valve cylinder l53.
  • the plug 54 is relieved so that air which eventually comes through the passage 51 will get into position behind the piston 56 and drive'iit upwardlyasrviewed in Figure 1.
  • anelongated valve stem 57 having fixed thereto a valve member 58 adapted to seat on the valve seat 59.
  • a passage 60 leads from the air chamber 25 to the upper region of the tiring valve cylinder 53.
  • a passage 61 leads from the central region ofthe tiring valve cylinder V53 to an annular area or clearing 62 surrounding the upper part of the sleeve 27 and the piston 36.
  • FIG. 1 illustrates the position of the stapler and its components prior to the time the trigger 46 is actuated. In this position any air in the clearance 62 is open to exhaust through the passage 61, around the valve stem 57, through the passage 64 and out the end of the stapler handle through the tube 63. Air entering the stapler into the chamber 25 can go no further than the upper region of the firing valve cylinder 53, via the passage 60, since the valve'seat 58 will be seated on the seat 59. The piston 36, and driver 37 which is pinned to it, will be maintained in the upper portion of the cylinder defined by the sleeve 27 by reason of the magnet 35.
  • the operation of the embodiment of the invention illustrated in Figure 1 is as follows.
  • the operator will grasp the handle 21 and squeeze the trigger 46 thereby moving the valve button 48 so as to open the passage 49 and permit air within the chamber 25 to pass through the passage 50, orifice 49 and passage 51 to the clearance pro- -vided in the member 54 behind the trigger piston 56.
  • the trigger piston 56 will rise, taking the valve button 65 with it.
  • Initial movement of the button 65 serves to close the exhaust passage 64. Further movement of the piston 56 and button 65 will result in upward movement of the stem 57 and valve member 58.
  • the driver 37 closes the exhaust port 66 in the nose member 23a which, with the member 23, denes the drive track 41, while the air which is under the piston 36 is forced through the lower ports 43 in the sleeve 27 and is slightly compressed in the storage chamber 42.
  • valves 44-45 are preferably located so that they will be just above the piston 36 when it is at rest on the bumper 31.
  • valve member 58 lthen abuts against its seat 59 thereby shutting otf air flow to the main borethe upper lpart of the cylinder sleeve 27.
  • the pressurized air which is in the cylinder above the piston 36 travels through the passage 61 and forces the valve button 65 down past the exhaust port 64 and thus is exhausted through this port and the tube ⁇ 63.
  • Figure 3 also shows a modiiication of the invention, which will be described, it does show the position of the main driving components at the time the piston 36 and driver 37 have reached the end of their driving stroke.
  • the piston 36 has seated against its stop 31 and has cleared the valve-ports 44. These ports are normally closed by resilient member 45.
  • the air pressure above this piston is suflicient to move the resilient member 45 so as to open the ports 44 whereupon additional air is compressed in the chamber 42.
  • Figure 3 also illustrates certain of the purposes of they clearance 32, or relief, given the stop 31. It will be ob- ⁇ served that the ports 43 are located so as to communicate with this clearance area.
  • the piston 36 has a greater diameter than the relieved portion 32 of the stop 31.
  • FIG. 3 there is illustrated another means for maintaining the piston 36 in its up position, this other means to replace the magnet 35 described in connection with the embodiment of Fig* ure 1.
  • the cap 33 has been enlarged and provided With a small projection 69 against which the piston 36 will abut in its up position. This will insure that air from the area 62 will reach the top side of this piston.
  • the piston holding means comprises a ball detent 70 spring biased within a plug 71 screwed into the main body 22. The ball 70 is urged towards the interior of the cylinder sleeve 27 by the spring 72 and is restricted by the opening 73-which is somewhat smaller than the diameter of the ball 70.
  • the detent means just described is located so as to register with the pin 38 by means of which the driver is held to the piston.
  • the detent ball 70 will be in alignment with the pin 38.
  • One end of this pin is dished as indicated at 74 so that the ball 70 may be forced into engagement With the dished end of the pin whereby to maintain the piston 36 in its up position.
  • the ball 70 will retract as the piston starts its driving stroke.
  • releasable means other than the magnet 35, detent 70 or clip 75 may be used to hold the piston 36 in its up position without the use of compressed air for this purpose.
  • the elimination of air for this purpose is a very important feature of the invention.
  • 'Ihose Staplers which depend on compressed air to maintain the piston 36 in the up position consume a great deal of air and are not economical to operate.
  • a small amount of air is stored (in other known tools this air isl tion until another drive stroke is initiated. During suchholding time no airis'required and in this manner a big saving in the economics of stapler operation has been accomplished.
  • FIGS 8 and 9 yet another manner of locating the air chamber is illustrated.
  • the chamber is shown as comprising a tube 42C fixed to the outside of thermain body 22.
  • the cylinder in which the piston reciprocates is indicated at27b and the stop for the piston lis indicated at 31.
  • the lower end of the storage tube 42C communicates with a passage 77 which passage in turn is open to the orifice 43b in the cylinder wall 27b.
  • the passage 77 extends to a position so that it communicates with a valve port 44-45 located in the cylinder wall 27b so as to be just above the top of the piston 36 when it is seated on the stop ⁇ 31.
  • ⁇ it is, desirable that there be some exhaust during such time as the piston is in its retracted position for this insures thatlair will not build up unduly in the lower part ofthe '10 cylinder, nor prematurely in the reservoir between eac drive stroke of the piston.
  • the preferred form of the invention envisions and embraces an arrangement wherein there is a definite exhaust passage which closes shortly after the drive stroke begins and opens shortly before the piston reaches its retracted position, the clearances for the driver being otherwise relatively tight. In its broader aspects, however, deviations from this preferred arrangement, as above indicated, are permissible.
  • FIG 11 there is illustrated another embodiment of a suitable valve means by which compressed air may reach a storage chamber.
  • a single orifice 44a which is normally closed by'a valve member 45a made of resilient material and mounted on a spring 78 which urges it to close the slogan 44a.
  • additional orifices of this type may be provided.
  • the slogan 44a is located in the cylinder wall 27 so that when the piston 36 is on its stop 31 air under pressure on top of the piston may force its way into thel storage chamber by passing through the perennial 44a, the' air pressure being sufficient to overcome the spring 78.
  • This is but another example of a suitable non-return or one-way valve which may be used in the, practice of this invention.
  • this invention may' be considered as involving the combination of: releasable.i holding means, other than uid power, -to hold the piston in retracted position; fluid power to overcome the releasable holding means and drive the piston to a piston stop; means to release the iluid power used to drive the piston to its stop; iiuid power operable beneath said piston to return said piston to said releasable holding means when' said first mentioned uid power is released; and means to release said last mentioned uid power at about the time said piston is engaged by said releasable holding means.
  • a pneumatic stapler including a piston and driver releasable holding means, other than air, for holding the piston in a retracted position; means to introduce compressed air so as to overcome said holding means and drive said piston to a piston stop; a reservoir into which air is moved by said piston as it makes its drive stroke; means to introduce additional-and compressed-air into said reservoir;
  • the form and location of the reservoir may vary.
  • the releasable holding means may vary.
  • the type of exhaust means may vary.
  • the manner of introducing additional, compressed air into the reservoir may vary. All of this has been described above.
  • a pneumatic stapling tool having a cylinder provided with a head, means for admitting air under pressure from a source of compressed air to said cylinder, a piston in said cylinder and a driver arranged to be actuated by said piston to travel in a driver slot to drive a staple, and means to place a succession of staples in said driver slot to be driven by said driver;
  • the improvement which comprises: releasable means operative independent of air pressure for normally holding said piston in retracted position with a portion, at least, of the head of said piston exposed to compressed air admitted to said cylinder, and means to limit the travel of said pis- Aton in a staple driving direction; a port in said cylinder adjacent said travel limiting means and disposed just below the lower surface of said piston when said piston has abutted said travel limiting means, a reservoir connected to said port so as to receive air moved by said piston when said piston is moved from its retracted position to said travel limiting means, means to admit compressed air into said reservoir only after said piston
  • the stapling tool of claim 1 including means toy substantially close said clearance immediately after said piston moves from its said retracted position.
  • a pneumatic stapling tool having a cylinder provided with a head, means for admitting vair under pressure Vfrom a source of compressed air to said cylinder, a ⁇ piston in said cylinder and a driver arranged to be actuated by said piston to travel in a driver slot to drive ⁇ a staple, and means to place a succession of staples in 'said driver slot to be driven by said driver;
  • the improvement which comprises: a magnet operative independent o f air pressure for normally holding said piston in retracted position with aportion, at least, of the head of said Vpiston exposed to compressed air admitted to said cylinder, and means to 'limit the travel of said piston in a staple .driving direction; a port in said cylinder adjacent said travel limiting means and disposed just below the lower surface of said piston when said piston has abutted said travel limiting means, a reservoir connected to said port, means to admit compressed air into said reservoir only after said piston abuts said travel limiting means, and
  • a pneumatic stapling tool having a cylinder pro- -vided with a head, means for admitting air under pressure from a source of compressed air to said cylinder,
  • Vthe improvement which comprises: releasable means operative independent of air pressure for normally holding said piston in retracted position with a portion, at least, of the head of said piston exposed to compressed air admitted to said cylinder, means to vlimit the travel of said piston in a staple driving direction, a port in said cylinder adjacent said travel limiting means and ydisposed just below the lower surface of said piston when said piston has abutted said travel limiting means, a reservoir connected to said port whereby air below said piston is discharged into said reservoir during staple driving movement of said piston, a second act upon the lower surface of said piston, whereby when compressed air is no longer admitted to said cylinder and said cylinder is open to atmosphere, the air under pressure in said reservoir causes said piston to return to retracted position where it is held independent -of air pressure by said releasable means.
  • a portable pneumatic stapler comprising a cylinder, a piston reciprocable in said cylinder between a home position and a driven position, a driver connected to said piston, a drive track in which said driver recip- 13 r'ocates,l means to Afeedatsuccession ⁇ of .staples'into said drive track in position to be driven by said driver, and vmeans for admitting compressed air to said piston so as to move said piston from said home position on a drive stroke to said driven position, whereby VtoV drive a staple through said drive track into work
  • the improvement whichcomprises: releasable means to hold said piston in its homeposition until said means for admitting compressed air to said piston is actuated; an ain storage chamber; air Vconduit means connecting said chamber with that end of said cylinder towards which said piston is driven on its drive stroke; valve means to permit air between said pistons home position and said pistons driven position, when said piston is in its home position, to escapeto atmosphere, said valve means including means to prevent escape
  • a pneumatic stapler comprising a cylinder having an upper end and a lower end, a piston slidable in said cylinder, a staple drive track, a staple driver slidable in said staple drive track, said staple driver being attached to said piston, staple feed means for feeding a succession of staples into said staple drive track in position to be engaged by said staple driver, the improvement which comprises: holding means normally operative to maintain said piston at the upper end of said cylinder, means to introduce air at said upper end of said cylinder under sufficient pressure to overcome said holding means and drive said piston to the lower end of said cylinder whereby to drive said staple driver through said staple drive track to drive a staple into work, valve means including said staple driver which opens said lower end of said cylinder to atmosphere when said piston is maintained at said upper end of said cylinder by said holding means and which closes said lower end of said cylinder to atmosphere when said piston is moved away from said holding means towards said lower end of said cylinder by introduction of air under pressure at said upper end of said cylinder, an air storage chamber which communicates with said
  • a cylinder provided with a head, a piston slidable in said cylinder, releasable means operative independent of air' pressure normally to hold said piston in a retracted position, travel limiting means for saidA piston, means for admitting air under pressure from a source to said cylinder so as to overcome said releasable means and drive said piston from said retracted position to said travel limiting means, a port in said cylinder adjacent said travel limiting means and disposed just below the surface of said piston when said piston has abutted said travel limiting means, a reservoir'connected to said port, a second port connected to said reservoir and to a source of air under pressure, a valve for said second port for admitting air under pressure to said reservoir when said piston abuts said travel limiting means, the air under pressure in said reservoir acting upon the lower surface of said piston via said first mentioned portand a passage from said cylinder for air beneath said piston when said piston is in its retracted position, said piston when seated on
  • the device of claim 9 including means to substantially close said passage immediately after said piston moves from its said retracted position.
  • a pneumatic stapling tool having a cylinder provided with a head, means for admitting air under pressure from a source of compressed air to said cylinder, a piston in said cylinder and a driver arranged to be actuated by said piston to travel in a driver slot to drive a staple
  • the improvement which comprises: a magnet to hold said piston in retracted position with a portion, at least, of the head of said piston exposed to compressed air admitted to said cylinder, means to admit compressed air to said cylinder suflicient to overcome said magnet and drive said piston, means to limit the travel of said piston in a staple driving direction, a lirst port in said cylinder adjacent said travel limiting means, a reservoir connected to said first port whereby air below said piston is forced into said reservoir during staple driving movement of said piston, a second port in said cylinder also communicating with said reservoir, said second port being disposed above the head of said piston when said piston has abutted said travel limiting means, whereby the compressed air in said cylinder above said piston then passes through
  • a cylinder provided with a head, a piston slidable in said cylinder, a magnet to hold said piston in a retracted position, travel limitingmeans for said piston, means for admitting fluid under pressure from a source to said cylinder so as to overcome said magnet and drive said piston from said retracted position to said travel limiting means, a rst port in said cylinder adjacent said travel limiting means, a reservoir connected to said first port whereby fluid moved by said piston when said piston is driven to said travel limiting means is forced into said reservoir, a
  • Vsecond port connected to said reservoir and to a source of fluid under pressure, a valve for said second port for admitting iluid under pressure to said reservoir when said piston abuts said travel limiting means,'the fluid under pressure in said reservoir acting upon the lower surface of said piston via said rst port, and means to diminish the uid pressure above said piston, whereby the uid under pressure in said reservoir causes said piston to return to retracted position where it is held by said magnet.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US809129A 1959-04-27 1959-04-27 Portable stapler with pneumatic drive and return Expired - Lifetime US2983922A (en)

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Application Number Priority Date Filing Date Title
US809129A US2983922A (en) 1959-04-27 1959-04-27 Portable stapler with pneumatic drive and return
BE582426A BE582426A (fr) 1959-04-27 1959-09-07 Agrafeuse portative avec entraînement pneumatique.
CH7831759A CH387569A (de) 1959-04-27 1959-09-17 Vorrichtung zur Betätigung eines Arbeitsorganes durch ein unter Druck stehendes Strömungsmittel und Verwendung der Vorrichtung

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US809129A US2983922A (en) 1959-04-27 1959-04-27 Portable stapler with pneumatic drive and return

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US2983922A true US2983922A (en) 1961-05-16

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CH (1) CH387569A (de)

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3087160A (en) * 1960-07-25 1963-04-30 Alvin Doppelt Stapling machine
US3101476A (en) * 1961-09-11 1963-08-27 Fastener Corp Fastener driving apparatus
US3128468A (en) * 1961-03-15 1964-04-14 Behrens Friedrich Joh Portable stapler with pneumatic drive
US3140492A (en) * 1961-01-13 1964-07-14 Behrens Friedrich Joh Stapling tool, especially guiding means for the driver thereof
US3147670A (en) * 1961-05-10 1964-09-08 Herman J Spencer Valve and other apparatus
US3160075A (en) * 1962-06-22 1964-12-08 Powers Wire Products Company I Cylinder and self return piston with lubrication means
US3181428A (en) * 1962-03-06 1965-05-04 Bukama G M B H Pneumatic fastener device
US3193167A (en) * 1963-06-13 1965-07-06 United Shoe Machinery Corp Hand tools for installing tacks and the like
US3205787A (en) * 1962-07-06 1965-09-14 Haubold Dieter Pneumatic air operated fastener driving device
US3216327A (en) * 1962-09-28 1965-11-09 John R Johansson Device for hydraulically or pneumatically controlling reciprocating movements of an operative means
US3251276A (en) * 1962-05-25 1966-05-17 Volkmann Dieter Stapling machine
US3313213A (en) * 1965-05-20 1967-04-11 Fastener Corp Fastener driving tool
US3320860A (en) * 1964-12-28 1967-05-23 Joh Friedrich Behrens Maschine Staple driving apparatus
US3329068A (en) * 1966-04-15 1967-07-04 Signode Corp Pneumatic piston return system for impact tools
DE1253196B (de) * 1961-06-29 1967-10-26 Behrens Friedrich Joh Mit Druckluft betriebenes Geraet zum Eintreiben von Befestigungsmitteln wie Klammern, Naegeln u. dgl.
US3362602A (en) * 1966-02-28 1968-01-09 Powernails Inc Nailing machine
US3363517A (en) * 1965-09-16 1968-01-16 Powers Wire Products Co Inc Air return percussive tool
US3392632A (en) * 1965-02-04 1968-07-16 Haubold Dieter Valve means for an air-operated fastener device
DE1274524B (de) * 1962-02-17 1968-08-01 Haubold Dieter Mit Pressluft betriebenes Geraet zum Eintreiben von Befestigungsmitteln, insbesondere Klammern
US3396636A (en) * 1967-01-28 1968-08-13 Behrens Friedrich Joh Compressed air-operated drive-in apparatus to drive-in fasteners, for instance, nails, staples or the like
US3397617A (en) * 1964-12-24 1968-08-20 Reich Maschf Gmbh Karl Pneumatic percussion machine
US3400637A (en) * 1966-08-08 1968-09-10 Trico Products Corp Fluid pressure power unit with magnetic latching means
US3407709A (en) * 1967-02-01 1968-10-29 Behrens Friedrich Joh Compressed air-operated apparatus to drive in staples, nails or other fasteners in workpieces
US3477629A (en) * 1966-11-23 1969-11-11 Senco Products Pneumatic fastener applying device
US3479926A (en) * 1965-12-29 1969-11-25 Gaston E Marbaix Ltd Pneumatic devices for driving fasteners or like purposes
US3499593A (en) * 1965-10-27 1970-03-10 Dieter Volkmann Pneumatic stapling device
US3567098A (en) * 1966-12-23 1971-03-02 Bostitch Div Of Textron Fastener driving apparatus operable under pressure conditions greater than line pressure
US3580435A (en) * 1968-04-15 1971-05-25 Atlas Copco Ab Spray gun with pressure operated valve
US3584776A (en) * 1968-10-04 1971-06-15 Adolf Bolte Pneumatically actuated stapling tool
US3645170A (en) * 1969-08-01 1972-02-29 Theodore A Varouxis Air cylinder with self-contained pneumatic piston return
US3760695A (en) * 1972-03-01 1973-09-25 Senco Products Resilient piston stop construction
US3969989A (en) * 1973-08-02 1976-07-20 Karl M. Reich Maschinenfabrik Gmbh Impact buffer for impact drive tools
US3999465A (en) * 1974-11-01 1976-12-28 Clark Equipment Company Magnet piston retention for free wheeling
US4843951A (en) * 1986-02-08 1989-07-04 Robert Bosch Gmbh Servocylinder with an electric piston stroke limiting switch
US5046653A (en) * 1988-04-01 1991-09-10 Hitachi Koki Company, Limited Fastener driving tool
US5181450A (en) * 1991-05-16 1993-01-26 Umberto Monacelli Pneumatic fastener driving apparatus with piston holding detent
EP0684108A1 (de) * 1994-05-20 1995-11-29 Umberto Monacelli Eintreibgerät für Befestigungselemente mit pneumatischem Antrieb
US6109165A (en) * 1996-05-03 2000-08-29 Illinois Tool Works Inc. Piston retention device for combustion-powered tools
US20030071105A1 (en) * 2001-10-15 2003-04-17 Hwai-Tay Lin Abrasion-resistant bumper for a nail-driving tool
US20040108353A1 (en) * 2002-11-19 2004-06-10 Iwan Wolf Combustion-engined setting tool
EP1868757A4 (de) * 2005-03-07 2014-11-19 Carroll Bassett Tragbares pneumatisches werkzeug zum aufbrechen von gestein
US20150053736A1 (en) * 2013-08-22 2015-02-26 Techtronic Power Tools Technology Limited Pneumatic fastener driver
WO2021158940A1 (en) * 2020-02-05 2021-08-12 Kyocera Senco Industrial Tools, Inc. Gas spring fastener driving tool with fill valve located in an end cap
US11110577B2 (en) 2017-11-16 2021-09-07 Milwaukee Electric Tool Corporation Pneumatic fastener driver

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1014639A (en) * 1910-11-26 1912-01-16 William Evans Colwell Pneumatic hammer for driving nails.
US2682052A (en) * 1953-04-03 1954-06-29 Albert G Juilfs Plunger and staple driving structure for pneumatic stapling machines
US2807021A (en) * 1955-02-10 1957-09-24 United Shoe Machinery Corp Fluid motors of the percussive type
DE1025349B (de) * 1954-09-18 1958-02-27 Reich Maschf Gmbh Karl Mit Druckluft betriebene Vorrichtung zum Einschlagen von Naegeln od. dgl.
DE1043974B (de) * 1955-07-12 1958-11-13 Reich Maschf Gmbh Karl Mit Druckluft betriebene Vorrichtung zum Einschlagen von Naegeln od. dgl.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1014639A (en) * 1910-11-26 1912-01-16 William Evans Colwell Pneumatic hammer for driving nails.
US2682052A (en) * 1953-04-03 1954-06-29 Albert G Juilfs Plunger and staple driving structure for pneumatic stapling machines
DE1025349B (de) * 1954-09-18 1958-02-27 Reich Maschf Gmbh Karl Mit Druckluft betriebene Vorrichtung zum Einschlagen von Naegeln od. dgl.
US2807021A (en) * 1955-02-10 1957-09-24 United Shoe Machinery Corp Fluid motors of the percussive type
DE1043974B (de) * 1955-07-12 1958-11-13 Reich Maschf Gmbh Karl Mit Druckluft betriebene Vorrichtung zum Einschlagen von Naegeln od. dgl.

Cited By (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3087160A (en) * 1960-07-25 1963-04-30 Alvin Doppelt Stapling machine
US3140492A (en) * 1961-01-13 1964-07-14 Behrens Friedrich Joh Stapling tool, especially guiding means for the driver thereof
US3128468A (en) * 1961-03-15 1964-04-14 Behrens Friedrich Joh Portable stapler with pneumatic drive
US3147670A (en) * 1961-05-10 1964-09-08 Herman J Spencer Valve and other apparatus
DE1253196B (de) * 1961-06-29 1967-10-26 Behrens Friedrich Joh Mit Druckluft betriebenes Geraet zum Eintreiben von Befestigungsmitteln wie Klammern, Naegeln u. dgl.
US3101476A (en) * 1961-09-11 1963-08-27 Fastener Corp Fastener driving apparatus
DE1274524B (de) * 1962-02-17 1968-08-01 Haubold Dieter Mit Pressluft betriebenes Geraet zum Eintreiben von Befestigungsmitteln, insbesondere Klammern
US3181428A (en) * 1962-03-06 1965-05-04 Bukama G M B H Pneumatic fastener device
US3251276A (en) * 1962-05-25 1966-05-17 Volkmann Dieter Stapling machine
US3160075A (en) * 1962-06-22 1964-12-08 Powers Wire Products Company I Cylinder and self return piston with lubrication means
US3205787A (en) * 1962-07-06 1965-09-14 Haubold Dieter Pneumatic air operated fastener driving device
DE1246622B (de) * 1962-07-06 1967-08-03 Haubold Dieter Mit Pressluft betriebenes Geraet zum Eintreiben von Klammern, Naegeln und aehnlichenBefestigungsmitteln
US3216327A (en) * 1962-09-28 1965-11-09 John R Johansson Device for hydraulically or pneumatically controlling reciprocating movements of an operative means
US3193167A (en) * 1963-06-13 1965-07-06 United Shoe Machinery Corp Hand tools for installing tacks and the like
US3397617A (en) * 1964-12-24 1968-08-20 Reich Maschf Gmbh Karl Pneumatic percussion machine
US3320860A (en) * 1964-12-28 1967-05-23 Joh Friedrich Behrens Maschine Staple driving apparatus
US3392632A (en) * 1965-02-04 1968-07-16 Haubold Dieter Valve means for an air-operated fastener device
US3313213A (en) * 1965-05-20 1967-04-11 Fastener Corp Fastener driving tool
US3363517A (en) * 1965-09-16 1968-01-16 Powers Wire Products Co Inc Air return percussive tool
US3499593A (en) * 1965-10-27 1970-03-10 Dieter Volkmann Pneumatic stapling device
US3479926A (en) * 1965-12-29 1969-11-25 Gaston E Marbaix Ltd Pneumatic devices for driving fasteners or like purposes
US3362602A (en) * 1966-02-28 1968-01-09 Powernails Inc Nailing machine
US3329068A (en) * 1966-04-15 1967-07-04 Signode Corp Pneumatic piston return system for impact tools
US3400637A (en) * 1966-08-08 1968-09-10 Trico Products Corp Fluid pressure power unit with magnetic latching means
DE1603979B1 (de) * 1966-11-23 1970-12-23 Senco Products Steuerventileinrichtung fuer den Arbeitshubraum eines Druckluftnaglers mit einem druckgesteuerten Steuerventil
US3477629A (en) * 1966-11-23 1969-11-11 Senco Products Pneumatic fastener applying device
US3567098A (en) * 1966-12-23 1971-03-02 Bostitch Div Of Textron Fastener driving apparatus operable under pressure conditions greater than line pressure
DE1301767B (de) * 1967-01-28 1969-08-21 Behrens Friedrich Joh Entlueftungseinrichtung fuer den fussseitigen Zylinderraum eines druckluftbetaetigten Schubkolbenantriebes fuer Heft- oder Nagelgeraete
US3396636A (en) * 1967-01-28 1968-08-13 Behrens Friedrich Joh Compressed air-operated drive-in apparatus to drive-in fasteners, for instance, nails, staples or the like
US3407709A (en) * 1967-02-01 1968-10-29 Behrens Friedrich Joh Compressed air-operated apparatus to drive in staples, nails or other fasteners in workpieces
US3580435A (en) * 1968-04-15 1971-05-25 Atlas Copco Ab Spray gun with pressure operated valve
US3584776A (en) * 1968-10-04 1971-06-15 Adolf Bolte Pneumatically actuated stapling tool
US3645170A (en) * 1969-08-01 1972-02-29 Theodore A Varouxis Air cylinder with self-contained pneumatic piston return
US3760695A (en) * 1972-03-01 1973-09-25 Senco Products Resilient piston stop construction
US3969989A (en) * 1973-08-02 1976-07-20 Karl M. Reich Maschinenfabrik Gmbh Impact buffer for impact drive tools
US3999465A (en) * 1974-11-01 1976-12-28 Clark Equipment Company Magnet piston retention for free wheeling
US4843951A (en) * 1986-02-08 1989-07-04 Robert Bosch Gmbh Servocylinder with an electric piston stroke limiting switch
US5046653A (en) * 1988-04-01 1991-09-10 Hitachi Koki Company, Limited Fastener driving tool
US5181450A (en) * 1991-05-16 1993-01-26 Umberto Monacelli Pneumatic fastener driving apparatus with piston holding detent
EP0684108A1 (de) * 1994-05-20 1995-11-29 Umberto Monacelli Eintreibgerät für Befestigungselemente mit pneumatischem Antrieb
US6109165A (en) * 1996-05-03 2000-08-29 Illinois Tool Works Inc. Piston retention device for combustion-powered tools
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
US20040108353A1 (en) * 2002-11-19 2004-06-10 Iwan Wolf Combustion-engined setting tool
EP1868757A4 (de) * 2005-03-07 2014-11-19 Carroll Bassett Tragbares pneumatisches werkzeug zum aufbrechen von gestein
US20150053736A1 (en) * 2013-08-22 2015-02-26 Techtronic Power Tools Technology Limited Pneumatic fastener driver
US9662777B2 (en) * 2013-08-22 2017-05-30 Techtronic Power Tools Technology Limited Pneumatic fastener driver
US11110577B2 (en) 2017-11-16 2021-09-07 Milwaukee Electric Tool Corporation Pneumatic fastener driver
US11897106B2 (en) 2017-11-16 2024-02-13 Milwaukee Electric Tool Corporation Pneumatic fastener driver
US12544894B2 (en) 2017-11-16 2026-02-10 Milwaukee Electric Tool Corporation Pneumatic fastener driver
WO2021158940A1 (en) * 2020-02-05 2021-08-12 Kyocera Senco Industrial Tools, Inc. Gas spring fastener driving tool with fill valve located in an end cap

Also Published As

Publication number Publication date
BE582426A (fr) 1960-12-31
CH387569A (de) 1965-01-31

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