EP0259280A2 - Steuerventil mit integriertem Auslass, insbesondere für Nietmaschinen - Google Patents

Steuerventil mit integriertem Auslass, insbesondere für Nietmaschinen Download PDF

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Publication number
EP0259280A2
EP0259280A2 EP87830318A EP87830318A EP0259280A2 EP 0259280 A2 EP0259280 A2 EP 0259280A2 EP 87830318 A EP87830318 A EP 87830318A EP 87830318 A EP87830318 A EP 87830318A EP 0259280 A2 EP0259280 A2 EP 0259280A2
Authority
EP
European Patent Office
Prior art keywords
duct
outer element
piston
axial bore
connects
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.)
Granted
Application number
EP87830318A
Other languages
English (en)
French (fr)
Other versions
EP0259280A3 (en
EP0259280B1 (de
Inventor
Vincenzo Cariati
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.)
Far Srl
Original Assignee
Far Srl
FAR SNC di Generali Giacomo
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 Far Srl, FAR SNC di Generali Giacomo filed Critical Far Srl
Priority to AT87830318T priority Critical patent/ATE74033T1/de
Publication of EP0259280A2 publication Critical patent/EP0259280A2/de
Publication of EP0259280A3 publication Critical patent/EP0259280A3/en
Application granted granted Critical
Publication of EP0259280B1 publication Critical patent/EP0259280B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/16—Drives for riveting machines; Transmission means therefor
    • B21J15/22—Drives for riveting machines; Transmission means therefor operated by both hydraulic or liquid pressure and gas pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/105—Portable riveters

Definitions

  • the invention relates to a pneumatic control valve with integral exhaust, in particular for riveting machines.
  • Such riveters are generally hydraulic/pneumatic in operation -i.e. utilizing a source of compressed air which actuates a manually controlled hydraulic unit comprising a rod to which the rivet is held by a clamping mechanism or a matching thread.
  • Activating the compressed air supply causes the rod to draw back from the rivet; the rivet shank is made fast to the rod, and traction force is thus exerted on the shank, which shifts in relation to the body of the rivet.
  • Riveting guns of the type in question mostly consist in a handgrip, attached to a single acting hydraulic cylinder at the top, and to a pneumatic cylinder at the bottom.
  • the hydraulic cylinder is actuated by an oil-filled chamber formed in the grip, inside of which the rod of the pneumatic cylinder is reciprocated; the grip also incorporates ducts that connect with the two chambers of the pneumatic cylinder and serve to make up the control circuit.
  • Riveting guns of this general design are beset by a drawback, namely, that the air inlet and exhaust circuits are complex to the point of rendering the gun prohibitive in terms of cost.
  • a source of annoyance typical of riveting guns is that of noise caused by the repeated discharges of air which occur during operation and produce a sharp hissing sound.
  • the object of the invention is that of overcoming the drawbacks mentioned above.
  • riveting gun to which it is applied can be rendered simple in design and construction, since the control valve envisaged requires no complicated circuitry, and is easy to fit.
  • a further advantage of the valve disclosed is that it can be located remotely from the operator's hand and positioned directionally in such a way as to give no annoyance to the operator.
  • valve disclosed has one exhaust outlet only, such that one silencer is sufficent for the purposes of muffling the noise produced by the gun.
  • a riveting gun e.g. of the type used to clinch blind rivets, comprises a vertical handgrip 21 attached at one end (top) to a hydraulic cylinder 22, and at the opposite end (bottom) to a pneumatic cylinder 23.
  • the grip 21 is usually designed anatomically to give the firmest possible hold, and incorporates control means 6 located at front, on a level with the index finger of the operator, consisting in a button 46 and an on-off valve 6.
  • 29 denotes a longitudinal chamber formed inside the grip 21, which is filled with oil
  • 44, 45, 48, 49 and 50 denote internal ducts by way of which the pneumatic cylinder 23 is connected with a supply of compressed air (not illustrated) and vented to atmosphere, respectively; more exactly, ducts 44 and 48 connect the cylinder with the air supply, whereas duct 45 connects with duct 44 by way of the on-off valve 6, such that air flows from duct 44 to duct 45 whenever the button 46 is depressed to operate the valve 6.
  • the hydraulic cylinder 22 is disposed substantially parallel to the on-off valve 6, and consists in a barrel 24 accommodating a piston 25 that is fastened rigidly to one end of a rod 26, the opposite end of which carries a clamping assembly 27, located above and forward of the button 46, that lays hold on the shank of the rivet (not illustrated).
  • the clamping assembly 27 comprises a collet 43, which is capable of movement inside and at the forward end of the housing of the clamping assembly.
  • the piston 25 is impinged upon at rear by spring means, for example, a coil spring 31, by which it is biased forwards.
  • the barrel 24 comprises at least one hole 28 by way of which the chamber 29 in the grip 21 is placed in communication with the chamber 24a of the hydraulic cylinder 22 occupied by the piston rod 26.
  • the rod 26 and the clamping assembly 27 are both axially hollow, the rod 26 extending back into a tube 32 that projects beyond the rear end of the barrel 24 and into a receptacle 33, supported by the barrel itself, which contains the severed rivet shanks.
  • 37 denotes a hole in the rod 26 that connects with duct 44 by way of a flow regulator 38 (not central to the invention, and therefore illustrated in part only). This same hole 37 connects with the tube 32, so that a blast of air can be directed toward the receptacle 33, creating suction by which the shanks of the set rivets are drawn into the receptacle.
  • the pneumatic cylinder 23 is disposed with its axis substantially vertical, and consists in a barrel 34 slidably accommodating a piston 35 made fast to the bottom end of a rod 30 that passes through the lower part of the grip 21 in a fluid-tight fit and strokes coaxially with and internally of the chamber 29.
  • the grip 21 of the rivet gun illustrated in fig 3 is embodied with a housing 19 located adjacent to the pneumatic cylinder 23 (see figs 1 and 2) and serving to accommodate a control valve 47 according to the invention.
  • the valve in question (see figs 1 and 2) consists in an outer element 4 and an inner element 7.
  • the outer element 4 appears substantially as a cup the side wall of which incorporates four ducts 1, 2, 3 and 5 that emerge into its interior at different points along the length of the element 4 itself.
  • the four ducts in question, 1, 2, 3 and 5, connect with respective ducts 44, 49, 50 and 45 in the grip 21.
  • the duct denoted 50 emerges directly into the upper chamber 23a of the pneumatic cylinder 23 at a point not visible in the view of fig 3, whilst duct 44 connects directly with duct 48 (likewise at a point not visible in the drawings), which in its turn is connected to the compressed air supply.
  • the inner element 7 of the valve exhibits an axial bore 10, and two external circumferential undercuts 11 and 12 the first of which, i.e. located nearest the stopped end of the outer element 4 and denoted 11, communicates via holes 13 with an enlarged end section 40 of the axial bore 10; this enlarged end section 40 of the bore accommodates the fluid-tight sliding motion of a piston 15 reciprocated between positions in which the holes 13 are blocked and left free, respectively.
  • the inner end of the housing 19 affords a port 41 serving to retain a silencer 18, and is provided with a stop 9 against which the inner element 7 registers, and on which to seat spring means, e.g. a coil spring 14, that serve to bias the inner element 7 against the stopped end of the outer element 4.
  • the stop 9 is embodied as a disk exhibiting a set of holes 42, one central, the remainder peripheral; these serve to connect the port 41 with the axial bore 10 of the inner element 7, and the circumferential chamber 16 of the outer element 4, respectively.
  • the inner element 7 is capable of movement between a first, at-rest limit position (fig 1), in which the holes 13 are left free by the piston 15 and ducts 1 and 3 are connected by the second undercut 12, and an operative limit position, in which the holes 13 are blocked by the piston 15 and ducts 1 and 2 are connected by the first undercut 11.
  • the dimensions of the undercuts 11 and 12 and of the outlet ducts 2 and 3 are such that the first 11 remains connected permanently with duct 2, and the second permanently with duct 3, regardless of the position of the inner element 7.
  • the distance from the second undercut 12 to the relative end of the inner element 7 is such, that whenever the inner element is in the operative position, this undercut 12 and the circumferential chamber 16 are caused to communicate (fig 2).
  • the duct denoted 5 emerges into the stopped end of the outer element 4 and connects with duct 45, which departs from the on-off valve 6 and runs downstream into the housing; thus, compressed air reaches the control valve 47 only when the on-off valve is open -i.e. when the button 46 is depressed.
  • Duct 44 is routed through the grip 21 substantially in rectilinear fashion, parallel to duct 45, and connects permanently with duct 48, hence with the compressed air supply (not illustrated).
  • the lower chamber 23b of the pneumatic cylinder 23 connects with the silencer 18 by way of duct 2, undercut 11, holes 13, axial bore 10 and the centre hole 42 of the stop 9, whilst the upper chamber 23a connects with the inlet duct 1 by way of duct 3 and undercut 12. Accordingly, one has higher pressure in the upper chamber 23a than in the lower 23b, and the piston 35 remains at its lower limit; the rod 30 is fully retracted in relation to the chamber 29 in the grip, no oil is directed into the chamber 24a of the hydraulic cylinder, and the hydraulic piston 25 thus remains biased toward the forward limit position by the relative spring 31.
  • Ducts 1 and 2 are connected by the one undercut 11, whilst the remaining undercut 12 connects duct 3 with the circumferential chamber 16, this connecting in its turn with the silencer 18 via the peripheral holes 42 in the stop 9.
  • the lower air chamber 23b now pressurizes to a higher level than that of the upper 23a, whereupon the piston 35 rises and carries the rod 30 with it, impinging on the hydraulic oil in the chamber 29 of the grip and transferring it into chamber 24a such that the bias spring 31 in the hydraulic cylinder is compressed.
  • the piston rod 26 retracts, and having tightened the collet 43 to the point of gripping the shank of the rivet, exerts the traction force necessary for its deformation.
  • the button 46 of the on-off valve will be released to block the flow of air from duct 44 into duct 45. Releasing the button has the effect of cutting off pressure hitherto supplied via duct 5, producing shift of the control valve piston 15 and inner element 7, and thus compressing the spring 14; accordingly, a small discharge of air occurs through the duct 45 and the on-off valve 6, and the bias spring 14 returns the inner element 7 and the piston 15 to their original at-rest positions.
  • Chambers 23a and 23b now connect once more with duct 1 and with the silencer 18, respectively, with the result that the difference in pressure causes the piston 35 of the pneumatic cylinder to return downwards, and the hydraulic piston 25 and rod 26 shift forwards, such that the jaws of the collet 43 are spread.
  • negative pressure created internally of the rod 26 and the tube 32 produces suction, and the severed shank of the rivet just clinched is drawn back into the receptacle 33. At this point, the gun is ready to apply another rivet.
  • the valve 47 is easily and swiftly installed in the riveting gun, as all that is required is to slot the assembly into the housing 19 and secure it with the circlip 39.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Exhaust Silencers (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Lift Valve (AREA)
  • Exhaust Gas After Treatment (AREA)
EP87830318A 1986-09-05 1987-09-04 Steuerventil mit integriertem Auslass, insbesondere für Nietmaschinen Expired - Lifetime EP0259280B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87830318T ATE74033T1 (de) 1986-09-05 1987-09-04 Steuerventil mit integriertem auslass, insbesondere fuer nietmaschinen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8604985U IT208712Z2 (it) 1986-09-05 1986-09-05 Valvola di distribuzione con scarico incorporato,in particolare per macchine rivettatrici
IT498586U 1986-09-05

Publications (3)

Publication Number Publication Date
EP0259280A2 true EP0259280A2 (de) 1988-03-09
EP0259280A3 EP0259280A3 (en) 1989-09-27
EP0259280B1 EP0259280B1 (de) 1992-03-25

Family

ID=11116733

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87830318A Expired - Lifetime EP0259280B1 (de) 1986-09-05 1987-09-04 Steuerventil mit integriertem Auslass, insbesondere für Nietmaschinen

Country Status (5)

Country Link
EP (1) EP0259280B1 (de)
AT (1) ATE74033T1 (de)
DE (1) DE3777728D1 (de)
ES (1) ES2029852T3 (de)
IT (1) IT208712Z2 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2525626A (en) * 1950-10-10 stouffer etal
US3039270A (en) * 1958-07-14 1962-06-19 Townsend Company Fluid powered gun for setting fasteners
EP0154280A2 (de) * 1984-03-05 1985-09-11 Huck Manufacturing Company Werkzeug zum Setzen von Befestigungselementen durch Einziehen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2525626A (en) * 1950-10-10 stouffer etal
US3039270A (en) * 1958-07-14 1962-06-19 Townsend Company Fluid powered gun for setting fasteners
EP0154280A2 (de) * 1984-03-05 1985-09-11 Huck Manufacturing Company Werkzeug zum Setzen von Befestigungselementen durch Einziehen

Also Published As

Publication number Publication date
ES2029852T3 (es) 1992-10-01
ATE74033T1 (de) 1992-04-15
EP0259280A3 (en) 1989-09-27
IT208712Z2 (it) 1988-05-28
DE3777728D1 (en) 1992-04-30
EP0259280B1 (de) 1992-03-25

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