US3153706A - Pneumatically-timed contact-holder - Google Patents

Pneumatically-timed contact-holder Download PDF

Info

Publication number
US3153706A
US3153706A US152224A US15222461A US3153706A US 3153706 A US3153706 A US 3153706A US 152224 A US152224 A US 152224A US 15222461 A US15222461 A US 15222461A US 3153706 A US3153706 A US 3153706A
Authority
US
United States
Prior art keywords
chamber
push
rod
membrane
actuator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US152224A
Other languages
English (en)
Inventor
Faffart Andre Georges
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.)
LA TELEMCANIQUE ELECTRIQUE
TELEMCANIQUE ELECTR
Original Assignee
TELEMCANIQUE ELECTR
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 TELEMCANIQUE ELECTR filed Critical TELEMCANIQUE ELECTR
Application granted granted Critical
Publication of US3153706A publication Critical patent/US3153706A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F1/00—Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals without driving mechanisms, e.g. egg timers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/86—Means for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts
    • H01H50/88—Mechanical means, e.g. dash-pot

Definitions

  • time-delay relays are generally bulky and of a complicated construction.
  • the main object of the present invention is to provide a pneumatic timing device overcoming the drawbacks of the devices presently known in that it can be adapted in a very simple manner for use either with a manual control push-button or with a relay or electromagnetic contactor.
  • Another object of the invention is to provide a timing device of the above-mentioned type but of little bulk and of a rational form.
  • Yet another object of the invention is to provide a timing device of the aforementioned type constituted by parts which are very easy to mount merely by placing them on top of one another, which enables the cost price of the apparatus to be lowered.
  • the pneumatic contact timing device conforming to the invention is essentially characterized by the fact that it comprises the combination of: a casing, in which is mounted a snap action switch whose central actuator can be operated from the outside of the casing; an operating body comprising a fore chamber and a rear chamber; a central channel connecting the fore chamber to the rear face of the operating body; a second channel, provided with an air intake throttling device, connecting the rear chamber to the fore chamber; two flexible membranes disposed on either side of the operating body and defining the volumes of the fore and rear chambers, the membrane located against the rear face of the operating body forming, in addition, a valve between the central channel and the rear chamber; a membrane push-rod adapted to push the fore membrane against the action of a resilient return system located Within the fore chamber and to force the air contained in this latter chamber through the central channel and the valve into the rear chamber, the operating body, the push-rod and the contact casing being disposed with respect to each other in such a way that any action, manually or
  • the assembly is provided with an external lateral strap which is slideable and adapted to act on the control rod for the snap action switch, this strap itself being acted upon by the mobile armature of a contactor or electromagnetic relay, this arrangement enabling the timing to be made either from the closing or from the opening of the relay by simply reversing the unit end-to-end with respect to the mobile armature of the contactor or electromagnetic relay.
  • the external lateral strap acts on this actuator through the intermediary of a leaf spring.
  • FIGURE 1 is an axial longitudinal section of the whole of a timing block conforming to the invention adapted for manual control, the different mobile members of this assembly being represented in the respective positions which they occupy immediately after the circuit-breaker has been actuated and following the moment when the pneumatic timing device starts to operate.
  • FIGURE 2 is a detail to a smaller scale illustrating a plan view of the contact casing within which the snap action switch is mounted.
  • FIGURE 3 is a detail to the same scale as FIGURE 2 illustrating a plan View of the operating body acting as a pumping chamber and valve seating.
  • FIGURE 4 is a cross-section of the operating body, this section being taken along line IVIV of FIGURE 3.
  • FIGURES 5 and 6 are details to a larger scale than the preceding details, representing the snap action switch in its two extreme operating positions.
  • FIGURES 7, 8 and 9 are explanatory diagrams of the working principle of the manual control members of the timer block illustrated in FIGURE 1;
  • FIGURES l0 and 11 are partially-sectioned elevations of two possible assemblies for a timing block conforming to the invention on the base-plate of a control contactor or electromagnetic relay, the timing taking place as from the closing of the relay in the case of FIGURE 10 and as from the opening of the relay in the case of FIGURE 11.
  • FIGURE 12 is a detail representing, seen from one end, the external lateral strap enabling the central push-rod of the timer to be acted on in the two preceding cases.
  • the ensemble of a timing block conforming to the invention essentially comprises: an operating body, designated by the general reference 1 and arranged in a known manner between two flexible membranes 2 and 3, made for instance, of rubber, this operating body acting as a pumping chamber and valve seating as will be seen in detail further on; a rear cover designated by the general reference 4 which serves as a'seating for a discharge valve 5 and as a support for a tapped member 6 in which is lodged an adjusting screw 7 enabling, as will be seen in detail further on, the desired value of timing to be set; a sub-assembly comprising a screen 8, a contact casing 9 and a cover lti, this sub-assembly forming a housing containing a snap action switch of any known type, designated by the general reference 11, as well as the guiding members for membrane 2, designated by the general reference 12.
  • the dilferent component parts of the ensemble of the timer block which have just been enumerated are mounted simply by stacking them one above the other and attaching them by means of longitudinal assembly rivets such as the rivet 13 shown in dotted lines in FIGURE 1.
  • These rivets which ensure that the apparatus is not upset in use, are tubular so as to be able to serve, as shall be described in detail further on, both for the securing of said timing block onto a base-plate receiving either a direct manual control device (FIGURES 1, 8 and 9) or an electromagnetic contnol device (FIGURES 10 and 11), and the sliding of the control strap for the circuit-breaker in the case of electromagnetic control.
  • the operating body 1 has, on its forward or left-hand side face (see FIGURES 1 and 4), a basin of frusto-conical shape 14- is extended by a cylindrical opening 15.
  • the central part of the body is traversed by a channel 16 whose fore part 16A is cylindrical and whose rear part 16B is frusto-conical, these two parts being connected by a medial restriction 16C, for example of square section.
  • a medial restriction 16C for example of square section.
  • On the rear face of body 1 is formed, concentric with the orifice of channel 16C, 21 small flange 17 of triangular section forming an escape valve joint in combination with the central portion 3A of the membrane 3 which is biased by the spring 5A of the valve 5.
  • a chamber 18 which volume is large with respect to that of the fore chamber delimited by the walls of the basin 1d, and of the membrane 2 when this latter occupies the position illustrated in chain-dotted lines in FIGURE 1; and secondly, the housing 19 for the air intake throttling device in the said fore chamber.
  • This throttling device is advantageously formed, as shown in FIGURES 1, 3 and 4, by a ball 26) in a soft resilient material, such as rubber for instance, which is pressed resiliently into a basin 21 communicating through a channel 22 with the inside of the basin 14.
  • a soft resilient material such as rubber for instance
  • the basin 21 is in the form of a hollow decapitated pyramid (see particularly FIGURES 3 and 4), such as a tetra hedron for example, whereby a crushing force on the ball leaves, along the arrises of the tetrahedron, air intake channels whose section is variable with the pressure that the ball exerts on its seating 21.
  • the desired pressure of the ball on its seating is obtained by screwing in or out the adjusting screw 7 whose base abuts against a member 23 which supports the ball 20 and is adapted to slide in the housing 19.
  • a return spring 24 acts to reduce the pressure exerted by the ball on its seating when the adjusting screw 7 is unscrewed.
  • a membrane push-rod 12 adapted to slide longitudinally in the axis of the apparatus in order to cause the said membrane to pass from the position shown by dotted lines in FIG URE 1 to the position shown in full lines on this same figure and to thereby force the air contained in the fore chamber 14, 15, through the channel 16 then through valve 17, 5, until it reaches the rear channel 18.
  • the rear face 12A of the membrane push-rod 12 is of shape complementary to that of the basin 14 in the operating body.
  • this membrane push-rod 12 has a central channel 25 wherein there is lodged as a slightly tight fit the fore extremity of a membrane-guide, constituted by a rod 26 having a cylindrical shoulder-piece 27 capable of adapting itself within the cylindrical portion 15 of the basin of the operating body 1.
  • the rear portion of the rod 26 can slide in the channel 16 of the operating body where it is guided by the restriction 16C.
  • the section of the rod 26 is circular whilst that of the restriction is square, it can be seen that the air forced from the fore chamber towards the outer chamber can infiltrate through the free spaces between the rod 26 and its housing 16.
  • Pressure-balancing bleeds are provided between the external chamber 18 and the chamber constituted by the inner volume of the contact casing 9. These balance bleeds can advantageously be formed by interstices between both the assembly rivets 13 and their respective housing 29 in the operating body 1 (FIGURE 3), and 30 in the contact casing 9 (see FIGURE 2).
  • flarings 31 are provided in order to allow air to infiltrate under the membrane 2 into the housings 29, flarings 31 are provided. Similarly, small channels 32 are formed in the front face of the casing 9 in order to allow the air which circulates in the housings 3G to reach the inner chamber of the contact casing 9.
  • a snap action switch of any known type, diagrammatically illustrated at 11 in FIGURE 1.
  • This snap action switch is controlled by an actuator 33 whose fore extremity 33A passes through an orifice 34 provided in the centre of the cover 10 of the contact casing and whose rear extremity 33B, which bears two lateral shoulders, passes through an orifice of corresponding form 35 provided in the rear part of the contact casing 9.
  • the extremity 33B of the contact push-rod comes to bear either against the extremity of the rod 26 of the membrane guide in the position of operation illustrated in FIGURE 1, or against the membrane support 12 during the timing phase, as will be seen in detail further on.
  • the actuator 33 controls in its turn a snap action switch constituted, for instance, as illustrated in FIGURES 5 and 6, by an undulated spring 36 adapted to move a mobile frame 37 brusquely from a first extreme position, in which it bears against fixed contact studs 38A, 38B (FIGURES 1 and 5), to a second extreme position in which it bears against fixed contact studs, 39A, 39B (FIGURE 6).
  • a snap action switch constituted, for instance, as illustrated in FIGURES 5 and 6, by an undulated spring 36 adapted to move a mobile frame 37 brusquely from a first extreme position, in which it bears against fixed contact studs 38A, 38B (FIGURES 1 and 5), to a second extreme position in which it bears against fixed contact studs, 39A, 39B (FIGURE 6).
  • These two series of fixed contact studs are connected respectively and in any known appropriate way to current outputs attached to the outside of the contact casing 9, 449A, 4013 and 41A
  • control of the contact timing device can be either manual or through a relay or electromagnetic contactor.
  • the assembly comprising the operating body 1, the membranes 2 and 3, the rear cover 4, the screen 8, the contact casing 9 and the cover 10, which is assembled by longitudinal rivets 13, forms a whole which is fixed, in the example chosen, to a base-plate 42 by means of a screw 43 passing through the hollow assembly rivets 13-.
  • a cross-piece 45 is mounted between the base 42 and the cover 16 so as to form a chamber 46 within which different intermediate members are actuated to transmit the movement of a push-button mounted in the axis of the device to the apparatus proper.
  • a flexible sealed membrane 47 enables the desired thrust to be made while ensuring effective protection of the assembly of intermediate control members against dust. These latter are to ensure that the fore air chamber 14, 15 is completely emptied before the cutting-01f of the snap action switch 11 can take place and so that retraction to the rear with timing can only occur as from this particular moment.
  • the contact casing 9 as well as its cover 10 are provided with lateral orifices 48A, 438 for the cover and 23A, 593 for the casing, disposed in relationship to each other so as to define two longitudinal passages parallel to the axis of the apparatus in which the two branches SiiA, $01 3 of a forked member provided with a sleeve 51 located in the axis of the apparatus can freely slide.
  • an intermediate push-rod 52 can slide, its fore extremity 52A receiving the control thrust and its rear extremity 5213 being able to transmit the said thrust to the extremity 33A of the contact push-rod.
  • a return spring 53 is provided between the cover 19 and the forked member A, 5813 Whilst another return spring 54, much more powerful than spring 53, is provided between the forked member and the head 52A of the intermediate push-rod 52.
  • the operation of the manual control contact timing device is as follows.
  • the different mobile members are located in the following respective positions:
  • the manual control members proper are in the position illustrated in FIGURE 7;
  • the members of the snap action switch are in the position illustrated in FIGURE 6;
  • the actuator 33, the membrane push-rod 12, the membrane 2 and its guide 26 are located completely over to the left in positions opposite to those which they occupy in FIGURE 1.
  • the extremities of the branches 59A, 50B of the forked member come into contact with the membrane push-rod I2 and force this latter in the direction of the arrow F.
  • the length of the branches of the forked member is determined so that the membrane push-rod I2 is forced completely to the right before the extremity 52B of push-rod 52 comes into contact with the head 33A of the actuator.
  • the manual control mobile members are located in the respective positions illustrated in FIGURE 8.
  • the mobile members are then located in the relative positions illustrated in FIGURE 1.
  • the assembly comprising the forked member 50A, 5R8 and intermediate push-rod 52 returns automatically to its initial position illustrated in FIGURE 7 under the action of the return springs 53 and 54.
  • the assembly comprising the membrane 2, membrane push-rod 12, and guide 26, urged by the return spring 28, returns slowly to its initial position as and when the air contained in the chamber 18 passes back into the fore chamber 14 through the ball throttling device 2t)- 21, the velocity of flow of air through this device being adjustable, as has previously been seen, by moving the adjusting screw 7 in its support 6.
  • the timer-snap action switch device can be controlled by a relay or electromagnetic contactor instead of being manually controlled.
  • the assembly constituted by the contact casing 9 and its cover 10, the operating body 1, its two membranes 2 and 3, the screen 8 and the rear cover 4, the whole assembled by hollow longitudinal rivets I3, is attached in this case onto a support piece55 itself mounted on the base-plate of a contactor or electromagnetic relay designated by the general reference 56 in FIGURES 10 and 11.
  • the timing device can easily be fixed onto the support 55 by means of two screws passing through two of the hollow assembly rivets 13.
  • the relay 56 has been diagrammatically illustrated by its winding 57 and its armature having, in the usual manner, a fixed part 58 and a mobile part 59, this latter being constantly biased in the direction F1 by any resilient return system (not illustrated)
  • the control of the actuator whose extremity 33A appears in FIGURES 10 and 11, can advantageously be operated by means of an external lateral forked member 60 which is mounted to slide by means of two rods 61, 62 passing through two of the hollow assembly rivets 13 and which has an extension 63 acting on the said actuator 33A.
  • a return spring 64 constantly biases the control forked member 60 in the direction of arrow F1.
  • the said forked member 60 has on its free face at least one projection 65 against which a complementary projection 66 of the mobile armature 59 of the relay bears when the said relay is operated.
  • relay armature can, indiiferently, have either a rectilinear stroke parallel to that of the membrane push-rod (as is the case for FIGURES 10 and 11), or an angular stroke.
  • timing occurs on the actuation of the relay.
  • the return springs retract the different mobile members to their respective positions illustrated in FIGURE 10, the snap action switch 11 being retracted to the position illustrated in FIG- URE 1.
  • the mobile armature 59 when the relay is energised, drives the lateral forked member 60 in the direction of arrow F2. This forked member acts on the actuator 33A by the extension 63 and closes the snay action switch 11.
  • the relay When the relay is de-energized the mobile armature 59 returns to its initial position as in FIGURE 11, and it is only then that the timing device comes into action.
  • the lateral forked member 60 acts 011 this actuator 33A through a leaf spring.
  • the extension 63 has an orifice 67 disposed to face the extremity 33A of the actuator.
  • a leaf spring 68 On the outer surface of said extension 63 there is fixed, by means of one extremity, a leaf spring 68 whose other extremity bears a stud 69 which passes through the orifice 67 and can bear resiliently against actuator 33A when the relay is closed.
  • a pneumatic timing apparatus comprising:
  • a throttling means operatively connected to said second channel adapted to enable fluid to return slowly from said second chamber into said first chamber
  • a snap action switch assembly having a switch actuator
  • a push member adjacent one of said membranes delimiting said first chamber and in a position to force that membrane into said chamber during operation of said push member
  • said first resilient means possessing less opposing force than said second resilient means to the extent that said forked member conducts said push member to the end of its stroke against the said adjacent membrane before said central push-rod can move against said switch actuator thereby actuating said switch assembly.
  • the pneumatic timing apparatus of claim 1 further characterized by a section of a wall of said first chamber conforming substantially to the surface of application of said push member whereby said adjacent membrane is applied integrally onto its seating constituted by said section of a wall.
  • the pneumatic timing apparatus in accordance with claim 1 further characterized by the volume of said second chamber being larger than the volume of said first chamber, a casing enclosing said push member and said switch actuator, and pressure balancing conduits forming fluid passageways between said second chamber and said casing whereby the pressure within said second chamber and the pressure around said push member are equalized.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Push-Button Switches (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
US152224A 1960-11-19 1961-11-14 Pneumatically-timed contact-holder Expired - Lifetime US3153706A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR844446A FR1280123A (fr) 1960-11-19 1960-11-19 Contact à temporisation pneumatique, pouvant être commandé à la main ou à distance

Publications (1)

Publication Number Publication Date
US3153706A true US3153706A (en) 1964-10-20

Family

ID=8743049

Family Applications (1)

Application Number Title Priority Date Filing Date
US152224A Expired - Lifetime US3153706A (en) 1960-11-19 1961-11-14 Pneumatically-timed contact-holder

Country Status (5)

Country Link
US (1) US3153706A (instruction)
BE (1) BE609131A (instruction)
ES (1) ES270979A1 (instruction)
FR (1) FR1280123A (instruction)
LU (1) LU40725A1 (instruction)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3406266A (en) * 1966-03-11 1968-10-15 Telemecanique Electrique Timed switch-control device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2538038A (en) * 1949-01-19 1951-01-16 Westinghouse Electric Corp Pneumatic time limit contactor
US2629793A (en) * 1949-01-19 1953-02-24 Westinghouse Electric Corp Pneumatic timing relay
US2662594A (en) * 1952-03-24 1953-12-15 Square D Co Time delay relay
US2855481A (en) * 1954-10-14 1958-10-07 Elastic Stop Nut Corp Time delay apparatus
US2866862A (en) * 1955-10-14 1958-12-30 Controls Co Of America Time delay switch
US3019317A (en) * 1959-04-10 1962-01-30 Clark Controller Co Time delay relay
US3037101A (en) * 1959-02-09 1962-05-29 Gamewell Co Temperature compensated pneumatic time delay devices

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2538038A (en) * 1949-01-19 1951-01-16 Westinghouse Electric Corp Pneumatic time limit contactor
US2629793A (en) * 1949-01-19 1953-02-24 Westinghouse Electric Corp Pneumatic timing relay
US2662594A (en) * 1952-03-24 1953-12-15 Square D Co Time delay relay
US2855481A (en) * 1954-10-14 1958-10-07 Elastic Stop Nut Corp Time delay apparatus
US2866862A (en) * 1955-10-14 1958-12-30 Controls Co Of America Time delay switch
US3037101A (en) * 1959-02-09 1962-05-29 Gamewell Co Temperature compensated pneumatic time delay devices
US3019317A (en) * 1959-04-10 1962-01-30 Clark Controller Co Time delay relay

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3406266A (en) * 1966-03-11 1968-10-15 Telemecanique Electrique Timed switch-control device

Also Published As

Publication number Publication date
ES270979A1 (es) 1962-01-01
FR1280123A (fr) 1961-12-29
LU40725A1 (instruction) 1961-12-18
BE609131A (fr) 1962-04-13

Similar Documents

Publication Publication Date Title
US6236624B1 (en) Timing device
ES466410A1 (es) Perfeccionamientos en grifos de tuberias
JPS5948904B2 (ja) 電動操作弁
GB1091302A (en) Gas-blast circuit breaker
US3153706A (en) Pneumatically-timed contact-holder
US4700030A (en) Switch device having an insulating screen inserted between the contacts during breaking
SU545270A3 (ru) Устройство дл гашени электрической дуги
GB1290386A (instruction)
US3509501A (en) Time delay mechanism
DE817170C (de) Einrichtung fuer das Einschalten von Druckgasschaltern
US2732124A (en) Gas compressor
US3798894A (en) Drive, preferably for the movable member of valves
US4179676A (en) Time delay relay movement
US3944955A (en) Solenoid switches
US4229632A (en) Compress gas circuit breaker
US2441412A (en) Circuit breaker control system
US3406266A (en) Timed switch-control device
US3336453A (en) Means for controlling the blast valve and contacts of a gas blast circuit breaker
SU608031A1 (ru) Устройство дл управлени клапаном пр мого действи
US2611274A (en) Electric starting motor for internal-combustion engines
US3345487A (en) Hydraulically operated circuit breaker
GB1603270A (en) Pneumatic operating mechanism for circuit-breaker
US3597557A (en) Compressed gas actuated electrical switch with sleeve valves
CN216915823U (zh) 装载机的驻车制动控制系统及装载机
SU381812A1 (ru) Пневматический переключатель