US1913812A - Lifting device for selectors in telephone exchanges - Google Patents

Lifting device for selectors in telephone exchanges Download PDF

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Publication number
US1913812A
US1913812A US608542A US60854232A US1913812A US 1913812 A US1913812 A US 1913812A US 608542 A US608542 A US 608542A US 60854232 A US60854232 A US 60854232A US 1913812 A US1913812 A US 1913812A
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US
United States
Prior art keywords
piston
actuating member
fluid
cylinder
selector
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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
US608542A
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English (en)
Inventor
Merk Friedrich
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.)
Fuld & Co Telephon
H FULD and Co TELEPHON- und TELEGRAPHENWERKE AG
Original Assignee
Fuld & Co Telephon
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 Fuld & Co Telephon filed Critical Fuld & Co Telephon
Application granted granted Critical
Publication of US1913812A publication Critical patent/US1913812A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H67/00—Electrically-operated selector switches
    • H01H67/02—Multi-position wiper switches
    • H01H67/04—Multi-position wiper switches having wipers movable only in one direction for purpose of selection
    • H01H67/12—Linear-motion switches

Definitions

  • the present invention has for its object an efficient solution of the lifting of selectors on the basis of an arrangement using compressed air or other fluid pres'sure which, contrary to the existingopinion, has a predominating suitability for the. purpose in view if it is carried out in the manner according to the present invention. Satisfactory results are obtained only when complying with the following conditions.
  • Lifting devices formed as a piston motor actuated by compressed air were used hitherto both for lifting the selectors and for braking the speed of movement of the selectors when setting. It is absolutely essential not to use the piston motors for an auxiliary purpose of braking, as the motors can never produce an accurately operating braking medium, which solely comes into action when settin the selector, and its capability of use 1%]? lifting the selectors thus suffers.
  • the braking action of an air or other fluid piston depends upon the compression or expansion of an enclosed quantity of the air or fluid, of which the amount on the one hand depends upon the uncertain packing conditions of the piston and on the other hand on the position of the actuating member, and of the piston previously 0011- ton and if desired also of the piston rod,
  • a further necessary improvement relates to the adjustment of the speed of the actuating member during lifting and when setting the selector.
  • it is necessary to balance the inconsistencies both of the piston load and of the pressure of the compressed air within as wide limits as possible.
  • provision is made, in accordance with the present invention, for the selector lifting, of the insertion of a throttle in the air supply pipe of each piston motor and the use of a brake for the selector adjustment which during setting is meghanically coupled with the actuating mem-
  • Figures 1 and 2 show a piston motor in side and front elevation.
  • FIGS 3 to 5 show the lower portion of the piston motor in cross section with the Valves.
  • Figures 6 and 7 show the arrangement of the piston motor in a bar selector with a flat bank multiple.
  • Figures 8 and 9 show a control mechanism of the selector.
  • the piston motor consists of a cylinder formed by a pipe 11, a piston 12 which slides easily therein while being as airtight as possible, a valve casing 13 screwed to the bottom of the pipe and provided with securing flanges 14, and a movable angle piece. a valve lifter 15, extending along the outer s de of the pipe and valve casing. The valve llfter is guided and held on the valve casing by a screw 16 and at the upper end by the piston rod 17 which it embraces.
  • the piston normally rests under the action of gravity on the plate-shaped extension 18 of the exhaust valve 19 which is pressed u wardly by a spring.
  • This valve connects t 1elower cyhnder space, in the position of rest shown in Figure 3, by the opening 20, open valve seat 21 and opening 22 with the outer air.
  • the adnnssion valve 23 located at the side thereof and also pressed upwardly by a spring, closes the cylinder space from the inlet openlng 24 for compressed air or other fluid.
  • the piston motor comes into operation when the position of the two valves is reversed. This is effected when the piston is depressed by an additional load applied to its rod.
  • the plate shaped extension 18 of the exhaust valve is moved downwardly by the piston and the valve 19 is closed, but it will be obvious that it might instead be forced down directly or through the mediary or some other means.
  • the plate shaped member 18 moves with the valve 19 and the inlet valve 23 is thus opened (see Figure 4).
  • Compressed air or other fluid now flows through the opening 24 into the cylinder space, this flow taking place slowly by reason of a throttle 25 fitted into the opening 24. As the compressed fluid flows into the space under the piston the pressure exerted 011 the piston slowly increases.
  • the uniform sunply of fluid is sufliciently ensured for the present purpose by the known property of a throttle namely that its resistance can be varied in proportion to the square of the speed of flow.
  • the throttle also has a strong balancing action on the supply of fluid in the case of considerable fluctuations in pressure of the fluid, and thus on the movement of the piston and of the selector which is lifted by the piston.
  • the throttle is formed as a screw with a wedge shaped groove, whereby the desired speedcan easlly 1: seat 21 and the opening 22 shown in Figures 3 and 4 are omitted in Figure 5.
  • the pin 42 of the exhaust valve is flattened on opposite sides at its lower end in such a manner that in the normal position shown com- ',munication is formed between the lower cylinder space and the outer air, while in the lowered operative position the unreduced portion of the pin 42 closes the hole 43.
  • this arrangement has the advantage that the exhaust is closed before admitting compressed fluid, while the supply'of the compressed fluid is'shut off before the exhaust is opened,'which is favourable for the 1 operation of the piston motor.
  • the bars 27 are located the contact fields 28 of the separate selectors.
  • the brush slide consists of a plate shaped carrier with five sets of brushes secured thereto which pass throu h slots in the supporting plate and sweep over the contact field located behind it in so far as they have been released in the known manner for closing the contacts by a rigid member (not shown).
  • Each brush slide is separately movable up .and down in front of its contact field in guide members 29 secured to the bars 27. During i the downward movement, which is controlled by the control mechanism, the brushes sweep over the contacts.
  • the control mechanism illustrated in Fig-- ures 8 and 9 shows on a base plate 30 with the supporting strap31 only the parts which are necessary for explaining the invention, these being a rack 32 sliding in two slots of the base plate, a release magnet 33 with a ratchet pawl 35 engaging with the rack teeth 34 of the rack and a-centrif-ugal brake 37 engaging with gear teeth 36 of the same rack.
  • the rack 32 is coupled during operation with a brush slide S so that the rack to some extent forms an extension of the slide.
  • Theslides are provided atthe lower end with a projection 38 ( Figure 7) by means of which they engage with a notch 40- of the rack when the control mechanismis fitted by means of its suspension strap in theholders 39.
  • the selectorsetting takes place, when the release magnet 33 is energized and the ratchet pawl is withdrawn from the rack 32 by the downward movement of the rack and of the slide.
  • the speed of these parts in this case is limited, after a short downward movement, by the brake 37 moving therewith, to a certain maximum velocity.
  • the compressed fluid is a centrally stored force (in a fluid chamber and the supply passages to the selectors). It is converted in a preparatory manner into individual stored forces by the piston motors of the selectors. It freedom is given to the central and individual force in a selector (in that for example the said ratchet pawl 35 is constantly withdrawn from the rack 32) the selector completes, while periodically releasing the two forces, upward and downward movements in the uniform cycle of a machine.
  • the additional control by the release magnet solely serves to initiate and to interrupt entirely the mechanical operation of the machine in a manner serving to produce and terminate the passage connections.
  • the actuating mechanism which in every respect is advantageous for the operation of the selector, establishes the prevailing action of the inventive steps and the successful solution of the problem which has been set.
  • the invention is not limited to the bar selector type given by way of example.
  • the explanations given permit of applying without difliculty the inventive ideas set out also to other arrangements of selectors and in fact to electromagnet-ically controlled releasing mechanisms for actuating purposes, such as control switches, number storage and so forth.
  • the means controlling the inlet valve for example might be operated by the switch control lever or other means than that here shown, and the means controlling the outlet valve actuated by the piston, the invention being not limited in and to the particulars described and shown.
  • a selector comprising an actuating member, a separate stored force for moving said actuating member, a locking device for preventing movement of said actuating member, means for operating said locking device and a device for returning said actuating member into its initial position after being set under the action of said stored force, consisting of a cylinder and a. piston movable in said cylinder, said piston being driven by a fluid pressure and connected with said actuating member only during the driving by said fluid pressure.
  • a selector comprising an actuating member, a separate stored force for moving said actuating member, a locking device for preventing movement of said actuating member, means for operating said locking device and a device for returning said actuating member into its initial position after being set under the action of said stored force, consisting of a vertically disposed cylinder, a iston movable upwardly by a compressed uid in said cylinder, said piston being connected to said actuating member only during the upward movement.
  • a selector comprising an actuating member, a separate stored force for moving said actuating member, a locking device for preventing movement of said actuating member, means for operating said locking device and av device for returning said actuating member into its initial position after being set under the action of.
  • said stored force consisting of a cylinder and a piston movable in said cylinder, said piston being driven by compressed fluid and connected with said actuating member only during the driving by the compressed fluid valves, one for admission of compressed fluid into said cylinder and one for exhaust of the fluid from said cylinder, means for controlling the inlet valve and means for controlling the exhaust valve.
  • a selector comprising an actuating member, a separate stored force for moving said actuating member, a locking device for preventing movement of said actuating member, means for operating said locking device and a device for returning said actuating member into its initial position after being set under the action of said stored force, consisting of a cylinder and a piston movable in said cylinder, said piston being driven by compressed fluid and connected with said actuating member only during the driving by the compressed fluid valves, one for the admission of the compressed fluid to said cylinder and one for the exhaust of the fluid from said cylinder, and means for controlling both valves, said means being operated by said piston at its two end posi tions.
  • a selector comprising an actuating member, a separate stored force for moving said actuating member, a locking device for preventing movement of said actuating member, means for operating said locking device and a device for returning said actuating member into its initial position after being set under the action of said stored force, consisting of a cylinder and a piston movable in said cylinder, said piston being driven by compressed fluid and connected with said actuating member only during the driving by the compressed fluid valves, one for admission of the compressed fluid into said cylinder and one for the exhaust of the fluid from said cylinder, a plate in the lower chamber of said cylinder connected with said exhaust valve, said .plate having an opening therein for the passage of the fluid, a rod connected with said inlet valve and projecting under said plate, a spring on the shaft of said exhaust valve holding said plate in a raised position, said plate only being depressed by said piston when loaded by said actuating member, a slide, a projection on said slide located beneath the shaft of said exhaust valve, a projection of said slide located above
  • a selector comprising an actuating member, a separate stored force for moving said actuating member, a locking device for preventing movement of said actuating member, means for braking the speed of setting of said actuating member, means for actuating said locking device and a device for returning said actuating member into the initial position after its setting under the action of said stored force, consisting of a cylinder, a piston movable in said cylinder, said piston being driven by compressed fluid and being connected to said actuating member only during the driving by said fluid valves, one for the admission of the compressed fluid into said cylinder and one for the exhaust of the fluid from said cylinder, means for controlling both valves, said means being operated by said piston in its two end positions, and means for braking the speed of the return movement of said actuating member, said means consisting of a throttle in the fluid pipe.
  • a selector comprising an actuating member, a separate stored force for moving said actuating member, means for braking the speed of setting of said actuating member, consisting of a centrifugal brake, means for engaging said centrifugal brake with said actuating member, said means only operating in one direction of movement of said actuating member, a locking device for preventing movement of said actuating member, means for actuating said locking device and a device for returning said actuating member into its initial position after its setting, consisting of a cylinder, a piston movable in said cylinder, said piston being driven by a compressed fluid and being connected to said actuating member only during the driving by said fluid valves, one for the admission of the fluid to said cylinder, and one for the exhaust of the fluid from said cylinder, means for controlling both valves, said means being actuated by said piston in its two end positions and means for braking the speed of return movement of said actuating member, consisting of a conical screw inserted in the fluid supply pipe to said piston.
  • a selector comprising an actuating member, a separate stored force for moving said actuating member, a locking device for preventing movement of said actuating member, means for braking the speed of setting of said actuating member, a magnet for actuating said locking device and a device for returning said actuatingmemb'er into, the initial position after its setting under-the action of said stored force, consisting of a cylinder, a piston movable in said cylinder, said piston being driven by a qompressed fluid and being connected to said actuating member only during the driving by said fluid valves, one for the admission of the compressed fluid into said cylinder and one for the exhaust of the fluid from said cylinder, means for controlling both valves, said means. being operated by said piston in its two endpositions, means for braking the speed of the return movementof said actuating'member, said means consisting of a throttle in the fluid pipe.
  • a selector comprising an actuating member, a separate stored force for moving said actuating member, a locking device for preventing movement of said actuating brake to said actuating member, said means T only operating in one direction of setting of said actuating member,rand a device for returning said actuating member into its initial position after its setting, consisting of a cylinder, a piston movable .in said cylinder, said piston being driven by a compressed fluid and being connected to said actuating member only during the driving by said fluid, valves, one for the admission of a fluid to said cylinder, and one for the exhaust of the fluid from said cylinder, means for controlling both valves, said. means being actuated by said piston in its two end positions and means for braking the speed of return movement of said actuating member, consisting of a conical screw inserted in the fluid supply pipe to said piston.
  • a selector comprising an actuating member, aseparate stored force for moving said actuating member, a locking device for preventing movement of said actuating member, a magnet for actuating said locking device, a device for returning said ac-. tuating member into its initial position after its setting under the action of said stored force,.consisting of a cylinder and a piston movable in said cylinder, said piston being driven by a compressed fluid and being connected with said actuating member only during the driving by said fluid, means for securing saidactuating member to a support and means for securing said cylinder independently of the means for securing said actuating member to said support.
  • a selector comprising a selector switch lever, an individually stored force for displacing said lever, a locking device for preventing movement of the lever, means for actuating the locking deviceand a device for returning the lever to its initial position after positioning by the stored force; said device comprising a cylinder, a movable piston, said piston being displaced f by a pressure medium and being connected to the switch lever only during its displacement by the pressure medium, Valves, one for the inlet of the pressure medium into the cylinder and one for the outlet of the 10 pressure medium from the cylinder, means for controlling the inlet valve, said means being controlled by the switch lever in its lowest position and means for controlling the outlet valve, the last-named means being controlled by the piston in one of its end positions.

Landscapes

  • Actuator (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Multiple-Way Valves (AREA)
  • Valve Device For Special Equipments (AREA)
US608542A 1931-05-01 1932-04-30 Lifting device for selectors in telephone exchanges Expired - Lifetime US1913812A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM115181D DE603142C (de) 1931-05-01 1931-05-01 Rueckstellvorrichtung fuer Fallwaehler und aehnlich wirkende Schaltapparate in Fernsprechanlagen

Publications (1)

Publication Number Publication Date
US1913812A true US1913812A (en) 1933-06-13

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ID=7328221

Family Applications (1)

Application Number Title Priority Date Filing Date
US608542A Expired - Lifetime US1913812A (en) 1931-05-01 1932-04-30 Lifting device for selectors in telephone exchanges

Country Status (6)

Country Link
US (1) US1913812A (fr)
AT (1) AT134194B (fr)
CH (1) CH160298A (fr)
DE (1) DE603142C (fr)
FR (1) FR730995A (fr)
GB (1) GB383790A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070246896A1 (en) * 2002-03-29 2007-10-25 Katsunori Matsuki Gasket

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070246896A1 (en) * 2002-03-29 2007-10-25 Katsunori Matsuki Gasket

Also Published As

Publication number Publication date
GB383790A (en) 1932-11-24
DE603142C (de) 1934-09-22
CH160298A (de) 1933-02-28
AT134194B (de) 1933-07-10
FR730995A (fr) 1932-08-26

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