US2423920A

US2423920A - Timer for riveters

Info

Publication number: US2423920A
Application number: US512885A
Authority: US
Inventors: Basil J Yanchenko
Original assignee: GA Braun Inc
Current assignee: GA Braun Inc
Priority date: 1943-12-04
Filing date: 1943-12-04
Publication date: 1947-07-15
Anticipated expiration: 1964-07-15

Description

lJuly 15,1947. B. J; YANCHENKO 2,423,920

TIMER PQR RIVETERS Filed nec. 4,l 194s s sheets-sheet 1 INVENTOR.

BASIL J. YANCH NKO ATTORNEYS July 15, 1947.

vFiled Dec. 4, 1945 5 Sheets-Sheet 2 2s H i 26 f v l2 Il I4 l .5

`42 I 36 l l? 45 3s l uw 'e se l' Il l2 SHFH dl l

FIGA

INVENTOR.

BAS". J.YANc-ENK0 uw ATTORNEYS July 15, 1947.

B. J.` YANCHENKO TIMER FOR RIVETERS Filed Dec. 4, 1943 3 Sheets-Sheet 3 Il, lllllll i Flexr v INVENTOR BAS|L J.YNCHENKO B MM 17M@ TTOR NE S Patented July 15, 1947 TIMER FOR BIVETEBS man J. Yanehenko, syracuse, N. Y., assigner, by

meme assignments, to G. A. Braun, Inc., Syracuse, N. Y., a corporation of New York Application December 4, 1943, Serial No. 512,885

1 '1211s invention relates to timers i'or timing the period of operation of a pneumatic machine. or the number of operations performed by the machine upon one operation of an operating or control member or trigger, and more speciilcally for timing the number of blows delivered during each operation of the trigger by a riveting machine. It has for its object a pneumatic timer having a means which automatically closes cut-out valve by a snap actionvin contradistinction to a gradual or follow-up action after a predetermined time period or number of operations.

The invention consists in the,novel features and in the combinations and constructions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanying drawings, in which 1ike characters designate corresponding 4parts in all the views.

Figure 1 is a side elevation, partly in section, of a riveter equipped with the timer.

Figure 2 is an enlarged end elevation of the timer, or a sectional view taken on the plane of line 22, Figure 1, parts being omitted, showing the timer in end elevation.

Figures 3 and 4 are sectional views taken at a right angle to each other on the planes of lines 3-1 and 4-4, respectively, Figure 2.

Figure 5 is an opposite end elevation from that shown in Figure 2, or a sectional view on line 5 5, Flgurel.

Figures 6 and 'l are fragmentary sectional views similar to Figure 3 of a riveter showing a modiiled form of the mechanism for causing the snap action or snap closing of the cut-out valve, Figure 6 showing the snap catch in its normal position, and Figure 7 the snap catch when pushed out by the build up of pressure to its unlocked position.

This timer comprises, generally, a body or easing having a valve controlled inlet for air under pressure, the valve being operated by the trigger or operating member of the machine or riveter, to which the timer is applied, a transfer passage leading from the valve controlled inlet passage to an outlet coupled to the air nlet passage of the pneumatic mechanism of t e machine or riveter to which the timer is applied, a normally open cut-out valve for closing said outlet, the cut-out valve being operated to closed position by pressure from the transfer chamber through 50 a pressure regulating valve, whereby the pressure operating to close the cut-out valve is gradually built up to a predetermined pressure and means for causing the cut-out valve to close with a snap action, whenv that predetermined pressure is 55 reached.

I designates the pneumatic machine to which the timer is applied, this being shown as a riveter having a pistol grip handle 2 and controlled by a trigger 3, the riveter having a suitable pneu- 60 matically operated tool or head or hammer 4 operated by pneumatic means within the barrel or body i. The air is supplied to the mechanism of the riveter through a e l, here shown as extending through the pistol grip 2, the passage 5 having an inlet end at 8 for coupling to a source of air. The outlet of the timer is coupled to this inlet passage 2. The riveter itself forms no part of this invention.

i I designates the body oi the timer, this being formed with an inlet passage I2 for coupling through a suitable conduit or hose I2 with a source of supply of compressed air, this psage i2 extending lengthwise of the body Il and having 'a two-way or combined intake andexhaust valve i4 therein. which is self-closing, as by a spring i5. 'I'his valve is normally arranged with its intake head closed and its exhaust head ope to permit the air to exhaust back from the tool or riveter through the exhaust passage i8 to the outer air. The intake end of this passage I2' is provided with a suitable nlter i1 carried by a plug I8 which is threaded or formed with the coupling section for connecting a coupling-piece i8 at the end ofthe air hose to the inlet e oi the timer. The valve is operated to open position against its returning spring l5 by a suitable means. as a lever 20, in the form of a yoke arranged astride the body II and pivoted at 2| thereto. this lever being operated by the trigger 3 through suitable means, as a push rod 22, extending lengthwise of the pistol grip 2. The lever 20 is provided with a suitable set screw 23 which coacts with the head of a plunger- 24 guided in a plug threading into the adjacent end of the intake passage i2, the stem thrusting against the exhaust valve head of the valve i4. A spring 25 acts on the plunger 24 to retract the lever 20 and trigger 3 to normal position, when theI trigger 40 3 is released. The valve controlled inlet passage i2 communicates through a transfer passage 26 with the outlet 21 of the timer, this outlet being coupled at 28 to the inlet end 6 of the passage 5 m the pistoi grip z.

29 designates the cut-out valve oi the timer, this being shown as a sliding piston valve located in a guide 30 and arranged to move crosswise of the branch 3| of the transfer passage 28 toward its seat at 32 at the entrance end of the outlet passage 28 of the timer. The face of the piston valve 29 is thus exposed to pressure within the branch 3l and the outlet 28 and hence the pres- Y sure tends to return the valve to open or starting position. This valve 29 is pressure-operated to closed position by pneumatic means operated 'by air coming through a bypass from the transfer passage 26 and through a pressure regulating valve. The pneumatic means here illustrated includes a piston 34 working in a piston chamber or cylinder bore 35, the piston and the bore being axially :warumV alined with the piston valve 2l. The piston chamber on the pressure side of the piston communicates with the transfer chamber 2l throughaby-'pass' havingapressureregulating'valve 21 therein. the outlet end of the regulating 'valve discharging into the piston chamber Il. The measure regulating valve is provided with a suitable adjustable metering pin 22 extending to the outside of 'the casing, where it is provided with im adjusting wheel 2l. The movement of the piston 3l by the air building up in the piston chamber behind it through the presof a returning spring 4I.

In the form shown in Figures 3 and 4, the means for closing the cut-out valve 2l with a snap action comprises a lost motion connection between the piston u and the valve 2l. As the valve 2l and the piston 24 are axially alined, this means is shown as a lost motion connection arranged to be taken up when the piston 24 vhas traveled a predetermined distance and hence pressure built up behind it to nearly the predetermined pressure, when the motion is taken up between the piston and lthe cut-out valve 2l, it is further retarded and stopped momentarily due to the resistance offered to the closing of the valve it by the air prassure'against it. As here illustrated, the lost motion connection between the piston 24 and the valve 2l is provided by a push rod 4I extending in advance of the piston 24 and normally spaced from the rear face of the cut-out piston valve 28 and located to come into engagement therewith, when the piston has traveled a predetermined distance and the pressure behind it built up. Now, as the motion of the piston is additionally momentarily retarded, the pressure continues to build up through the pressure regulating valve to an extent whereby it overcomes the air pressure on the face of the valve 29 presented to the air in the

passages

26, 21 and the pressure of the spring Il, and hence closes the valve 28 with a quick or snap action. The number of operations of the riveter or the time it requires for the pressure to build up to perform this function may be adjusted by regulating the metering pin 38.

For the purpose of effecting a quick exhaust of the air from the piston chamber 35, when the operator releases the trigger 3, a pressuresure regulating valve isagainst the resistance 'gradually toward its seat as the pressure' to. the cut-out valve Il so that the valve I. move:l the piston u .buuds up through tle pressure regulating valve. However, as the cut-out valve Il approaches its seat, it encounters a spring resistance which momentarily stops its movement. so that the pressure builds up behind the piston 2l .to an extentthat vcauses the valve BI to suddenly overcome its spring resistance and close with a snap action. The spring resistance ls here shown as a spring-pressed poppet or ball Il located in a passage Il andA pressed into operative position by a spring 82 located between the ball and a plug 6I closing the outer end of the paage. The inner end of the passage is contracted to prevent undue displacement of the ball from its seat M. The ball, however, projects beyond its seat into the path of the cut-out valve I9. When the cut-out valve 59 moves from the position shown in Figure 6 into a position, whereby it contacts'the ball 60, the pressure builds up behind the piston 24 to an extent whereby the pressure overcomes the resistance of the ball 60, and also any resistance on the face of the piston valve 5I, causing it to close against its seat with a snap action, and in so doing, displacing the ball or poppet into the position shown in Figure 7.

In either form of the invention, the cut-out valve is closed with a snap action. 'I'he time for closing or the number of operations of the riveter may be varied by adjusting the metering pin y38.

The subject matter of this invention is similar to that of my pending application. Serialv Number.476,976, filed February 24, 1943. The difference, however, is the closing of the cut-out valve with a snap action.

What I claim is:

l. In a timer, the combination of a casing having an inlet passage for a motive fluid, and an outlet passage, the inlet passage having a self-returnf ing combined intake and exhaust control valve operated check valve is provided by-passing the l pressure regulating valve, this being here shown as a valve head 42 normally closed on its seat l2 in position to close an exhaust passage 44 from the piston chamber 34, the valve being held against its seat by a spring II. The valve 42 exv tends transversely of the passage 3.8 and is formed with an annular groove or duct permitting the air to ilow from the transfer passage 26 aroundthe valve head I2. When, however. the operator releases the trigger I, thus closing the intake valve Il and opening the exahust valve head thereof, the piston Il is returned to its starting position by its spring 4l, thus forcing the air through the exhaust passage 44 with lsumcient pressure to open the check valve 42, so that the air exhausts quickly back `through the transfer chamber into the i2 and out through the exhaust port i6.

IntheformsshowninHgures6and7,thesnap action is effected by a controlled resistance instead of by a lost motion between the piston 2l and the cut-out valve 2l.

InFig1u-es`6and'I,thepushrodli thrusts' directly against. without lost motion, or is coupled therein normally arranged with its intake closed and its exhaust open, a transfer passage between the valve and the outlet, a normally open cut-out valve operable to close the outlet, and pressureoperated means in the timer operated by the pressure oi' Ithe air in the transfer passage for controlling the last valve including means for causing the cut-out to close with a snap action.

2. In a timer, the combination of a, casing having an inlet passage for a motive fluid, andan outlet passage, the inlet passage having a selfreturning combined intake and exhaust control valve therein normally arranged with its intake closed and its-exhaust open,'a transfer passage from closing movement and from movement with v thepiston until the pressure through the pressure regulating valve has built up to a predetermined amount.

3. In a timer, the combination of a casing h aving an inlet passage for a motive fluid, and an outlet e, the inlet passage having a selfreturning combined intake and exhaust control valve therein normally arranged with its intake closed and its exhaust open, a transfer passage between the valve and the outlet, a normally open cut-out valve operable to close the outlet, a pressure-operated member, means between it and the cut-out valve for transmitting the movement of said mem-ber to the cut-out valve, to close the cut-out valve, a pressure regulating valve to control the flow of motive fluid to the pressure-operated member, the cut-out valve having a pressure face located so that the pressure of the air passing the open cut-out valve' tends to hold it open, and means for delaying the closing movement of the cut-out valve until the pressure through the pressure regulating valve has built up to a predetermined amount, the delaying means including a lost motion connection between the pressure-operated member and the control valve.

4. In a timer, the combination of a casing having an inlet passage for a motive uid, and an outlet passage, the inlet passage having a selfreturning combined intake and exhaust control valve therein normally arranged with its intake closed and its exhaust open, a transfer passage between the valve and the outlet, a normally open cut-out valve arranged in position to, when operated, close the outlet and having a face presented to the pressure of fluid in the outlet, a piston chamber, a piston in the chamber, a by-pass connecting the transfer passage and the piston chamber on the pressure side of the piston and having a pressure regulating valve therein, means for yieldingly restraining the movement of the piston by the air pressure passing through the by-pass, and means for transmitting the motion of the piston to the cut-out valve causing the closing of the cut-out valve by the piston to be momentarily delayed and held from movement with the piston until the pressure in the piston chamber through the bypass has built up to a predetermined amount.

5. iIn a timer, the combination of a casing having an inlet passage for a motive fluid, and an outlet passage, the inlet passage having a selfreturning combined intake and exhaust control valve therein normally arranged with its intake closed and its exhaust open, a transfer passage between the valve and the outlet, a normally open cut-out valve arranged in position to, when operated, close the outlet and having a face presented to the pressure of fluid in the outlet, a piston chamber, a piston in the chamber, means for transferring the movement of the piston to the cut-out valve including a lost motion connection permitting the piston to be moved by the air pressure relative to the cut-out valve before the lost motion is taken up, a by-pass connecting the transfer passage and the piston chamber on the pressure side of the piston and having a pressure regulating valve therein, and means for yieldingly restraining the movement of the piston by the air pressure passing through the by-pass.

6. In a timer, the combination of a casinghavlng an inlet passage for a motive fluid, and an outlet passage, the inlet passage having a selfreturning combined intake and exhaust control valve therein normally arranged with its intake closed and its exhaust open, a transfer passage between the valve and the outlet, a normally open cut-out valve arranged in position to, when operated, clese the outlet and having a face presented to the pressure of uuid in the outlet, a piston chamber, a piston in the chamber having pass connecting the transfer passage and the piston chamber on the pressure side of the piston and having a pressure regulating valve therein, means for retarding the movement of the piston by the air pressure passing through the by-pass, the piston being connected to the cut-out valve to press against the same as the air pressure builds up behind the piston chamber and a snap restraining device for holding the cut-out valve for movement until a predetermined pressure is built up behind the piston.

7. In a timer, the combination of a casing having an inlet passage for a motive fluid, and an outlet passage, the inlet passage having a selfreturning combined intake and exhaust control valve therein normally arranged with its intake closed and its exhaust open, a transfer passage between the valve and the outlet, a normally open cut-out valve arranged in position to, when operated, close the outlet and having a facey presented to the pressure of fluid in the outlet, a piston chamber, a piston in the chamber having a rod operable to close the cut-out valve, a bypass connecting the transfer passage and the piston chamber on the pressure side of the piston and having a pressure regulating valve therein, means for retarding the movement of the piston 'by the air pressure passing through the bypass, the piston being connected to the cut-out valve to press against the same as the air pressure builds up behind the piston chamber, and a snap restraining device for holding the cut-out valve from movement until la predetermined pressure is built up behind the piston, said device being arranged to coact with the cut-out valve when the piston approaches the end of its throw.

8. In a timer, the combination of a casing having an inlet passage for a motive fluid, and an outlet passage, the inlet passage having a selfreturning combined intake and exhaust control valve therein normally arranged with its intake closed and its exhaust open, a transfer passage between the valve and the outlet, a normally open cut-out valve operable to close the outlet, pressure-operated means in the timer operated by the pressure of the air in the transfer passage for controlling the last valve including means for causing the cut-out valve to close with a snap action, means operable on the pressure-'operated means to return said means to starting position when the pressure therein is released, and an exhaust valve for the pressure-operated means opened by the pressure of the returning means a rod operable to close the cut-out valve, a bywhen the control valve `is returned to normal position.

BASIL J. YANCHENKO.

REFERENCES CITED The following references are of record in the ille of this patent:

UNITED STATES PATENTS Number Name Date 2,067,064 Platz Jan. 5, 1937 1,956,962' Ringle May 1,v 1934 1,801,069 Boker Apr. 14, 1931 FOREIGN PATENTS Number Country Date 689 Great Britain ----1 1870