EP0259280B1 - Control valve with integral exhaust, in particular for riveting machines - Google Patents
Control valve with integral exhaust, in particular for riveting machines Download PDFInfo
- Publication number
- EP0259280B1 EP0259280B1 EP87830318A EP87830318A EP0259280B1 EP 0259280 B1 EP0259280 B1 EP 0259280B1 EP 87830318 A EP87830318 A EP 87830318A EP 87830318 A EP87830318 A EP 87830318A EP 0259280 B1 EP0259280 B1 EP 0259280B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- duct
- piston
- outer element
- inner element
- control valve
- 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
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Images
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
Abstract
Description
- The invention relates to a pneumatic control valve with integral exhaust, in particular for riveting machines.
- The prior art embraces machines known as riveters, or riveting guns, designed to render the application of blind rivets (plain or screw shank) simple, safe and practical.
- 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 and rend the gun of high 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.
- Whilst attempts have been made to design muffling features into riveting guns, the end-result obtained is simply further complication of the air circuits.
- For example, the US-A-3 039 270 provides a valve system according to the pre-characterising part of
claim 1 where a valve plate provided of a series of openings is fixed by inner and outer seat gaskets to the body of the gun and cooperates with a valve block fixed against the outer gasket comprising a slide valve driven in motion by a yoke connected to a control piston and urged flat against the said valve plate by a compression spring. - Depending to the movement of the said control piston (due to the pression air coming from an air hose coupling) the slide valve is moved between its feed stroke and return stroke position to obtain, consequently, the movement of the main piston of the gun.
- The said valve system provides a muffler packing through which the air is discharged to atmosphere retained in a recess of the body of the gun and collected with the valve plate by a passage obtained in the body of the gun.
- The valve system and the muffler packing are practically separated one to the other and their connection requires, as mentioned above, to realize a specific recess and a specific passage inside the body of the gun.
- Furthermore for the couplement of the valve plate, outer and inner gaskets, slide valve, control piston, requires the use of mechanical elements (compression spring - shoulders - bolts etc. ).
- In another example shown in the EP-A-0 154 280, a directional valve is practically provided at the outside of the body of the gun and secured to a side wall of the said body and it requires a particular logic circuit for its operation obtained during the realization of the main cylinder of the said gun in correspondence with the said side wall.
- The said directional valve is provided of a muffler connected with the discharging channel of the air to atmosphere specifically provided in the body of the gun as part of the said logic circuit.
- Accordingly, the object of the invention is that of overcoming the drawbacks mentioned above by a control valve as characterized in the appended claims, with integrated exhaust and muffler of simple realization and where the inner element of which incorporates an axial bore that is vented to the atmosphere affording an exhaust outlet for the air in direct communication with a muffler accomodated in the housing inside to which the control valve is located.
- One of the advantages of the invention is that the riveting gun to which it is applied can be rendered simple in design and constructing, 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 directly inside the body gun and positioned directionally in such a way as to give no annoyance to the operator.
- Another advantage of the valve disclosed is that it has one exhaust outlet only, such that one silencer is sufficent for the purposes of muffling the noise produced by the gun.
- The invention will now be described in detail, by way of example, with the aid of the accompanying drawings, in which:
- figs 1 and 2, are longitudinal sections through the control valve disclosed, viewed in the at-rest and in the operative position, respectively;
- fig 3 is a longitudinal section through a gun of the type used for setting blind rivets, fitted with a valve according to the invention.
- With reference to fig 3, it will be observed that a riveting gun, e.g. of the type used to clinch blind rivets, comprises a
vertical handgrip 21 attached at one end (top) to ahydraulic cylinder 22, and at the opposite end (bottom) to apneumatic cylinder 23. Thegrip 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 abutton 46 and an on-offvalve 6. - 29 denotes a longitudinal chamber formed inside the
grip 21, which is filled with oil, whilst 44, 45, 48, 49 and 50 denote internal ducts by way of which thepneumatic cylinder 23 is connected with a supply of compressed air (not illustrated) and vented to atmosphere, respectively; more exactly,ducts duct 45 connects withduct 44 by way of the on-offvalve 6, such that air flows fromduct 44 toduct 45 whenever thebutton 46 is depressed to operate thevalve 6. - The
hydraulic cylinder 22 is disposed substantially parallel to the on-offvalve 6, and consists in abarrel 24 accommodating apiston 25 that is fastened rigidly to one end of arod 26, the opposite end of which carries aclamping assembly 27, located above and forward of thebutton 46, that lays hold on the shank of the rivet (not illustrated). Theclamping assembly 27 comprises acollet 43, which is capable of movement inside and at the forward end of the housing of the clamping assembly. Thepiston 25 is impinged upon at rear by spring means, for example, acoil spring 31, by which it is biased forwards. - The
barrel 24 comprises at least one hole 28 by way of which thechamber 29 in thegrip 21 is placed in communication with thechamber 24a of thehydraulic cylinder 22 occupied by thepiston rod 26. Therod 26 and theclamping assembly 27 are both axially hollow, therod 26 extending back into atube 32 that projects beyond the rear end of thebarrel 24 and into areceptacle 33, supported by the barrel itself, which contains the severed rivet shanks. - 37 denotes a hole in the
rod 26 that connects withduct 44 by way of a flow regulator 38 (not central to the invention, and therefore illustrated in part only). Thissame hole 37 connects with thetube 32, so that a blast of air can be directed toward thereceptacle 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 abarrel 34 slidably accommodating apiston 35 made fast to the bottom end of arod 30 that passes through the lower part of thegrip 21 in a fluid-tight fit and strokes coaxially with and internally of thechamber 29. - 36 denotes a tube passing through the
piston 35 in a fluid-tight fit, which is attached rigidly to the lower part of thegrip 21 and connects with the duct denoted 49. - The
grip 21 of the rivet gun illustrated in fig 3 is embodied with ahousing 19 located adjacent to the pneumatic cylinder 23 (see figs 1 and 2) and serving to accommodate acontrol valve 47 according to the invention, the saidhousing 19 being transversal respect to thegrip 21 and being integral part of the said grip. - The valve in question (see figs 1 and 2) consists in an
outer element 4 and aninner element 7. - The
outer element 4 appears substantially as a cup the side wall of which incorporates fourducts element 4 itself. The four ducts in question, 1, 2, 3 and 5, connect withrespective ducts grip 21. - The duct denoted 50 emerges directly into the
upper chamber 23a of thepneumatic cylinder 23 at a point not visible in the view of fig 3, whilstduct 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. - 16 denotes a circumferential chamber located in the the
outer element 4 at its open end, the purpose of which will be made clear in due course. Theouter element 4 registers in thehousing 19 with stopped end outermost, lodged thus immovably, for example, retained by acirclip 39 fitted to thehandgrip 21 internally of thehousing 19. - The
inner element 7 of the valve exhibits anaxial bore 10, and two externalcircumferential undercuts outer element 4 and denoted 11, communicates viaholes 13 with an enlargedend section 40 of theaxial bore 10; this enlargedend section 40 of the bore accommodates the fluid-tight sliding motion of apiston 15 reciprocated between positions in which theholes 13 are blocked and left free, respectively. - It will be seen from figs 1 and 2 that the
piston 15 terminates in anappendage 51 which registers in the narrow part of thebore 10 as the piston reaches the position whereby theholes 13 are blocked (fig 2). - It will be observed from figs 1 and 2 that the inner end of the
housing 19 affords aport 41 serving to retain asilencer 18, and is provided with astop 9 against which theinner element 7 registers, and on which to seat spring means, e.g. acoil spring 14, that serve to bias theinner element 7 against the stopped end of theouter element 4. Held fast inside thehousing 19 by theouter element 4, thestop 9 is embodied as a disk exhibiting a set ofholes 42, one central, the remainder peripheral; these serve to connect theport 41 with theaxial bore 10 of theinner element 7, and thecircumferential chamber 16 of theouter element 4, respectively. - The
inner element 7 is capable of movement between a first, at-rest limit position (fig 1), in which theholes 13 are left free by thepiston 15 andducts holes 13 are blocked by thepiston 15 andducts first undercut 11. The dimensions of theundercuts outlet ducts duct 2, and the second permanently withduct 3, regardless of the position of theinner element 7. The distance from the second undercut 12 to the relative end of theinner element 7 is such, that whenever the inner element is in the operative position, this undercut 12 and thecircumferential chamber 16 are caused to communicate (fig 2). - The duct denoted 5 emerges into the stopped end of the
outer element 4 and connects withduct 45, which departs from the on-offvalve 6 and runs downstream into the housing; thus, compressed air reaches thecontrol valve 47 only when the on-off valve is open -i.e. when thebutton 46 is depressed. - Duct 44 is routed through the
grip 21 substantially in rectilinear fashion, parallel toduct 45, and connects permanently withduct 48, hence with the compressed air supply (not illustrated). - Operation of a riveting gun as illustrated in fig 3, which is fitted with a
control valve 47 according to the invention, will now be described. - In the at-rest configuration (that of figs 1 and 3) the
inner element 7 of thecontrol valve 47 remains biased into the at-rest limit position by thespring 21, with thepiston 15 clear of theholes 13. - In such a situation, the
lower chamber 23b of thepneumatic cylinder 23 connects with thesilencer 18 by way ofduct 2, undercut 11,holes 13,axial bore 10 and thecentre hole 42 of thestop 9, whilst theupper chamber 23a connects with theinlet duct 1 by way ofduct 3 and undercut 12. Accordingly, one has higher pressure in theupper chamber 23a than in the lower 23b, and thepiston 35 remains at its lower limit; therod 30 is fully retracted in relation to thechamber 29 in the grip, no oil is directed into thechamber 24a of the hydraulic cylinder, and thehydraulic piston 25 thus remains biased toward the forward limit position by therelative spring 31. - The shank of a rivet is now inserted between the jaws of the
collet 43, and offered to the hole in the material to be riveted, whereupon the operator depresses thebutton 46 of the on-offvalve 6 so as to connectducts duct 5, thecontrol valve piston 15 shifts forward to block theholes 13, and theinner element 7 is urged against thespring 14 into its operative position (fig 2). -
Ducts remaining undercut 12 connectsduct 3 with thecircumferential chamber 16, this connecting in its turn with thesilencer 18 via theperipheral holes 42 in thestop 9. Thelower air chamber 23b now pressurizes to a higher level than that of the upper 23a, whereupon thepiston 35 rises and carries therod 30 with it, impinging on the hydraulic oil in thechamber 29 of the grip and transferring it intochamber 24a such that thebias spring 31 in the hydraulic cylinder is compressed. Thepiston rod 26 retracts, and having tightened thecollet 43 to the point of gripping the shank of the rivet, exerts the traction force necessary for its deformation. Once the shank of the blind rivet has been severed in the normal way, thebutton 46 of the on-off valve will be released to block the flow of air fromduct 44 intoduct 45. Releasing the button has the effect of cutting off pressure hitherto supplied viaduct 5, producing shift of thecontrol valve piston 15 andinner element 7, and thus compressing thespring 14; accordingly, a small discharge of air occurs through theduct 45 and the on-offvalve 6, and thebias spring 14 returns theinner element 7 and thepiston 15 to their original at-rest positions. Chambers 23a and 23b now connect once more withduct 1 and with thesilencer 18, respectively, with the result that the difference in pressure causes thepiston 35 of the pneumatic cylinder to return downwards, and thehydraulic piston 25 androd 26 shift forwards, such that the jaws of thecollet 43 are spread. At the same time, negative pressure created internally of therod 26 and thetube 32 produces suction, and the severed shank of the rivet just clinched is drawn back into thereceptacle 33. At this point, the gun is ready to apply another rivet. - The simplification of a riveting gun permitted by incorporation of a
control valve 47 according to the invention will be discerned by observing fig 3, from which it can be seen that thepneumatic cylinder 23 is served by just a few simple air ducts, and air is exhausted through theinner element 7 of thecontrol valve 47 itself. - The
valve 47 is easily and swiftly installed in the riveting gun, as all that is required is to slot the assembly into thehousing 19 and secure it with thecirclip 39.
Claims (3)
- Control valve with integral exhaust, in particular for riveting machines, of the type comprising one air inlet (1) and a first and a second air outlet (2, 3), the said first (2) and second (3) air outlets being respectively in communication with the upper chamber (23a) and with the lower chamber (23b) of the pneumatic cylinder (23) of the riveting machine, the said control valve being fitting in a housing formed in the body (21) of the machine, the said housing being provided of a removable silencer or muffler (18),
characterized in that it comprises- a substantially cylindrical outer element (4), coupled and fixed coaxially inside to the said housing (19), with an axial bore (16) stopped at one end and connecting, via its remaining open end, with the said silencer (18), said outer element (4) exhibiting four substantially peripheral and radial ducts (1, 2, 3 and 5) three of which (1, 2, 3) constitute the said air inlet and air outlets, and the fourth (5) connects with control means (6) for operation of the valve and being located closed to the stopped end of the said outer element (4);- an inner element (7), fluid-tight shifting within the outer element (4), embodied with an axial bore (10) and with two external circumferential undercuts (11,12) the first of which communicates via the holes (13) with the axial bore (10), the said inner element (7) being subjected to the action of spring means (14) by which it is biased toward the stopped end of the outer element (4);- a piston (15), fluid-tight shifting within the axial bore (10) of the said inner element (7) between respective limit position in which the holes (13) are respectively blocked and left clear, the said piston (15) being normally in its rest position with the inner element (7) biased toward the stopped end of the outer element (4) and being in communication with the said duct (5);the said outlet duct (2) communicating with the upper chamber (23a) and the said outlet duct (3), communicating with the lower chamber (23b) of the pneumatic cylinder (23), being disposed so to be in connection with the axial bores (10) and (16) of the inner (7) and outer (4) elements, and respectively with the air inlet duct (1) with the said inner element (7) and piston (15) biased toward the stopped end of the outer element (4), and to be in connection with the air inlet (1) and respectively with the said axial bores (10) and (16) when the control means (6) are activated to collect the air inlet (1) to the fourth duct (5) with the consequent shifting movement of the said inner element (7) against the action of the spring means (14), and of the piston (15) in the limit position in which the holes (13) are blocked. - Control valve as in claim 1, wherein the fourth duct (5) emerges adjacent to the stopped end of the outer element (4), and the remaining open end of the outer element encompasses a circumferential chamber (16) that is connected with the second circumferential undercut (12) of the inner element (7) whenever the operative configuration of the valve is assumed, and wherein the piston (15) is located internally of the inner element (4), accommodated within an enlarged end section (40) of the axial bore (10) positioned adjacent to and directed toward the stopped end of the outer element (4).
- Control valve as in claim 1, removably accommodated in fluid-tight fashion internally of a housing (19) formed in the body (21) of the machine to which it is fitted, wherein the housing is provided with a ported stop (9) against which the open end of the outer element (4) registers, is connected with the compressed air inlet duct (44), the outlet ducts (49, 50) supplying air to the service, and the duct (45) routed from the control means (6), and is open at the end provided with the stop (9) to permit of accommodating a removable silencer (18).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87830318T ATE74033T1 (en) | 1986-09-05 | 1987-09-04 | CONTROL VALVE WITH INTEGRATED OUTLET, ESPECIALLY FOR RIVETING MACHINES. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT498586U | 1986-09-05 | ||
IT8604985U IT208712Z2 (en) | 1986-09-05 | 1986-09-05 | DISTRIBUTION VALVE WITH INCORPORATED DISCHARGE, IN PARTICULAR FOR RIVETING MACHINES |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0259280A2 EP0259280A2 (en) | 1988-03-09 |
EP0259280A3 EP0259280A3 (en) | 1989-09-27 |
EP0259280B1 true EP0259280B1 (en) | 1992-03-25 |
Family
ID=11116733
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87830318A Expired - Lifetime EP0259280B1 (en) | 1986-09-05 | 1987-09-04 | Control valve with integral exhaust, in particular for riveting machines |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0259280B1 (en) |
AT (1) | ATE74033T1 (en) |
DE (1) | DE3777728D1 (en) |
ES (1) | ES2029852T3 (en) |
IT (1) | IT208712Z2 (en) |
Family Cites Families (3)
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 |
US4580435A (en) * | 1984-03-05 | 1986-04-08 | Huck Manufacturing Company | Installation tool for pull type fasteners |
-
1986
- 1986-09-05 IT IT8604985U patent/IT208712Z2/en active
-
1987
- 1987-09-04 ES ES198787830318T patent/ES2029852T3/en not_active Expired - Lifetime
- 1987-09-04 EP EP87830318A patent/EP0259280B1/en not_active Expired - Lifetime
- 1987-09-04 DE DE87830318T patent/DE3777728D1/en not_active Expired - Fee Related
- 1987-09-04 AT AT87830318T patent/ATE74033T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
IT208712Z2 (en) | 1988-05-28 |
DE3777728D1 (en) | 1992-04-30 |
ATE74033T1 (en) | 1992-04-15 |
EP0259280A3 (en) | 1989-09-27 |
ES2029852T3 (en) | 1992-10-01 |
EP0259280A2 (en) | 1988-03-09 |
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