US2918545A - Revolution switch - Google Patents

Revolution switch Download PDF

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Publication number
US2918545A
US2918545A US714651A US71465158A US2918545A US 2918545 A US2918545 A US 2918545A US 714651 A US714651 A US 714651A US 71465158 A US71465158 A US 71465158A US 2918545 A US2918545 A US 2918545A
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US
United States
Prior art keywords
mercury
switch
casing
contact surface
slot
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
US714651A
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English (en)
Inventor
Bomhard Franz-Josef Von
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.)
ZF Sachs AG
Original Assignee
Fichtel and Sachs AG
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 Fichtel and Sachs AG filed Critical Fichtel and Sachs AG
Application granted granted Critical
Publication of US2918545A publication Critical patent/US2918545A/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
    • H01H29/00—Switches having at least one liquid contact
    • H01H29/26—Switches having at least one liquid contact with level of surface of contact liquid displaced by centrifugal action

Definitions

  • Revolution switches known in prior art are so constructed that the opening or the closing of la pair of contacts takes place at a predetermined number of revolutions of a rotary body through the use of centrifugal weights mostly connected with springs ⁇ and attached to mechanical transmission members.
  • An object of the present invention is the provision of a revolution switch which avoids the above-described and other drawbacks of priory art constructions.
  • FIGS 1, 2 and 3 tare longitudinal sections through a switch constructed in accordance with the principles of the present invention, and illustrate the mercury consttuting a pant of the switch in three different positions.
  • FIG. 4 is a similar section through a somewhat dierently constructed switch.
  • Figure 5 is a perspective view of a somewhat differently constructed rotary element constituting a part of the switch, a part of said rotary element being shown as being broken off.
  • FIGS 1, 2 and 3 of the drawings illustrate 'an electrical switch which is operated automatically at a certain number of revolutions, and which is preferably used in conjunction with a motor vehicle.
  • This switch includes a casing consisting of two parts 1 ⁇ and 2 and firmly mounted in the vehicle in any suitable manner.
  • a shaft 3 is rotatably mounted within the casing 1, 2 and may have outwardly projecting ends which are 4suitable for attaching the shaft to the usual speedometer drive.
  • shaft 3 must be mounted substantially vertically so as to avoid detrimental effects by the earth acceleration.
  • a casing consisting of two parts 4 and 5 is keyed upon the shaft 3, so that it is rotatable therewith, and is mounted withinthe outerfcasing 1, 2.
  • the lower part 4 of the casing may consist'of an electrically conducting material.
  • Upper casing portion 5, consisting essentially of an insulating material, is connected with the lower casing portion 4 in an air-tight manner.
  • the upper casingportion 5 carries an electrically conducting contact surface member 6, which is conductively connected with a slip ring 7. However, the contact surface member 6 is insulated with respect to the shaft 3.
  • the slip ring 7 receives electrical current from engagement with sliding contacts 8 which are insulated with respectto the casing portion 2 and which are vconnected with ⁇ a cable 9 for the transmission of Aelectrical current.
  • the electrically conducting casing portion 4 is connected tothe same source of electrical Vcurrent through the shaft'3 and the casing 1, 2, which may be made of electrically conducting material.
  • a owing mercury mass10 is located within the inner casing 4, 5 and in the normal position of the switch is carried by the bottom casing portion 4.
  • the upper casing portion 5 has a rib extending toward the lower portion 4 so as to form Ian annular slot 11 extending between two concentrical chambers 11a and 11b provided within the casing- 4, 5.
  • The' length of the slot 11 is of importance for the operation of the switch, as will be described in detail hereinafter.
  • the lower casing portion 4 has an inclined surface 4a extending'toward and beyond the slot 11.
  • the mercury 10 When the. shaft 3v is not rotated the mercury 10 is located in its lowermost position within the casing 4, 5l In this position, whichis shown -in Figure 1, the mercury 10 provides an electrical connection between the contact surface member 6 and the conducting casing portion 4, which constitutes the second contact surface member.
  • an electrical connection - is established through the source of electrical energy, the cable connection r9, the sliding contacts 8, the slip ring 7, the contact surface member 6, the mercury 10, the casing portion or contact surface member 4 and back to the source of electrical energy through the shaft 3.
  • the mercury 1'0 ⁇ will assume substantially the form of a ring and, as shown in Figure 2, under the action of centrifugal forces will gradually move outwardly upon the inclined portion 4a of the member 4. It is apparent that the number of revolutions at which the mercury 10 will assume the position shown in Figure 2, depends upon the angle of the cone formed by the inclined surface 4a. However, in the position shown in Figure 2, the mercury 10 still provides a conducting connection between the contact surface members 6 and 4.
  • revolution switches of this type require a cert-ain lag between the number of revolutions required for the switching on 'and the number of revolutions for the switching off, so as to eliminate a continuous, usually ickering switching when the vehicle moves for a longer time period within the range of the revolutions pertaining to the switching operations.
  • the provision of the'two concentrical charnbers 11a and 11b separated by a slot 11 of predetermined length, is used in accordance with the present invention to -attain this result. Due to the high surface tension peculiar to mercury, the mass of mercury 10 Iwill ow through the slot 11 only when an additional force is provided.
  • the mercury 10 will be forced through the slot 11 into the space 11b with a higher speed than the one which is set by the angle of the inclined surface 4a as the average speed. Furthermore, the mercury 10 will tlow from the chamber 11b back to the chamber 11a through the slot 11 at a lower speed than the .average speed. Thus the required lag is provided.
  • the extent of the lag can be influenced by the length of the slot 11.
  • Figure 3 shows that when the device is rotated at higher speeds, the mercury passes through the slot 11 and will be located in its entirety in the chamber 11b. Then the electrical yconnection between the contact surface members 6 and 4 is interrupted.
  • Figure 4 illustrates a somewhat similar switch wherein, however, the electrical connection between the contact surface members 6a and 4 is interrupted when the switch stands still, or rotates at low speeds. Elements similar' to those shown in Figures 1 to 3 are designated by the same numerals.
  • the contact surface member 6a projects into the chamber 11b, so that an electrical connection between the Contact surface members 6a and 4 is established at high speeds when the mercury 10 is located in the chamber 11b.
  • the switch is essentially the same as the one previously described.
  • This slip has, on the one hand, the advantage that the mercury which constitutes a substantial proportion of the rotating masses, will not follow very quick speed changes which can take place, for example, when the drive does not operate uniformly, or when vibrations take place, so that the torque peaks for the drive are considerably reduced; on the other hand, the time lag can be detrimental in certain instances, depending upon the intended use of the switch.
  • Figure 5 illustrates a casing portion 5a having an annular chamber, the inner surface 12 of which is substantially star-shaped.
  • the surface 12 forms blades or paddles which facilitate the return tlow of the mercury when the speed of rotation of the casing portion 5a is diminished, with the result that the closing of the electrical circuit is thereby speeded up.
  • the inner chamber of the rotary casing can be evacuated in the usual manner, or it can be lled with a suitable gas, such as nitrogen.
  • a revolution switch comprising a shaft, a rotary casing carried by said shaft and having two opposed contact surface members, means separating the interior of said casing into two concentrical chambers with an annular slot interconnecting said chambers, an inclined surface of constant slope throughout its length adjacent said slot, and an insulating portion carrying one of said contact surface members at a radial distance from said shaft and opposite the other one of said contact surface members, mercury within said casing, said mercury being movable through said slot and along said inclined surface to one position within one of said chambers and to another position within the other one of said chambers, said two contact surface members being conductively interconnected by said mercury in one of said positions, the conducting connection between the two contact surface members being interrupted when said mercury is in the other position, an accelerated rotation of said casing causing a centrifugal flow of said mercury along said inclined bottom portion to one of said two positions, said mercury being thrust through said slot in one direction by an addi tionally increased centrifugal force corresponding to a higher than average speed and said mercury being moved through

Landscapes

  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Dc Machiner (AREA)
  • Switch Cases, Indication, And Locking (AREA)
US714651A 1957-04-12 1958-02-11 Revolution switch Expired - Lifetime US2918545A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF22810A DE1052505B (de) 1957-04-12 1957-04-12 Drehzahlabhaengiger Schalter

Publications (1)

Publication Number Publication Date
US2918545A true US2918545A (en) 1959-12-22

Family

ID=7090592

Family Applications (1)

Application Number Title Priority Date Filing Date
US714651A Expired - Lifetime US2918545A (en) 1957-04-12 1958-02-11 Revolution switch

Country Status (6)

Country Link
US (1) US2918545A (US06342305-20020129-C00040.png)
BE (1) BE563053A (US06342305-20020129-C00040.png)
CH (1) CH336110A (US06342305-20020129-C00040.png)
DE (1) DE1052505B (US06342305-20020129-C00040.png)
FR (1) FR1190110A (US06342305-20020129-C00040.png)
GB (1) GB829893A (US06342305-20020129-C00040.png)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3094595A (en) * 1960-10-20 1963-06-18 Leblond Mach Tool Co R K Zero speed switch
US3104294A (en) * 1960-10-31 1963-09-17 Burroughs Corp Centrifugal mercury switch
US3114017A (en) * 1960-07-29 1963-12-10 Burroughs Corp Centrifugal mercury switch
US3789170A (en) * 1971-06-19 1974-01-29 F Ferrario Conducting fluid type inertia responsive switch for motor vehicles
US4725699A (en) * 1986-11-10 1988-02-16 Houdeshell Donald D Low rotary speed detecting switch
CN106745535A (zh) * 2016-12-30 2017-05-31 福州品行科技发展有限公司 一种动作感应式富氢水杯

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1362023A (fr) * 1963-04-17 1964-05-29 Perfectionnement aux régulateurs centrifuges

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1498113A (en) * 1922-03-22 1924-06-17 Alfred W Olds Mechanism for actuating automobile speed and stop signals
US1588459A (en) * 1923-02-09 1926-06-15 Walter M S Kilgour Circuit breaker
US1785705A (en) * 1928-06-22 1930-12-16 Gen Railway Signal Co Circuit controller
US1983502A (en) * 1931-11-10 1934-12-04 Detroit Lubricator Co Control means
US2164991A (en) * 1937-04-15 1939-07-04 Vaco Products Inc Speed controlled switch
US2205375A (en) * 1933-09-23 1940-06-18 Gen Motors Corp Control apparatus for engine starters
US2291237A (en) * 1940-11-13 1942-07-28 Walter M S Kilgour Switch
US2438067A (en) * 1945-03-17 1948-03-16 Ibm Circuit breaker

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1498113A (en) * 1922-03-22 1924-06-17 Alfred W Olds Mechanism for actuating automobile speed and stop signals
US1588459A (en) * 1923-02-09 1926-06-15 Walter M S Kilgour Circuit breaker
US1785705A (en) * 1928-06-22 1930-12-16 Gen Railway Signal Co Circuit controller
US1983502A (en) * 1931-11-10 1934-12-04 Detroit Lubricator Co Control means
US2205375A (en) * 1933-09-23 1940-06-18 Gen Motors Corp Control apparatus for engine starters
US2164991A (en) * 1937-04-15 1939-07-04 Vaco Products Inc Speed controlled switch
US2291237A (en) * 1940-11-13 1942-07-28 Walter M S Kilgour Switch
US2438067A (en) * 1945-03-17 1948-03-16 Ibm Circuit breaker

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3114017A (en) * 1960-07-29 1963-12-10 Burroughs Corp Centrifugal mercury switch
US3094595A (en) * 1960-10-20 1963-06-18 Leblond Mach Tool Co R K Zero speed switch
US3104294A (en) * 1960-10-31 1963-09-17 Burroughs Corp Centrifugal mercury switch
US3789170A (en) * 1971-06-19 1974-01-29 F Ferrario Conducting fluid type inertia responsive switch for motor vehicles
US4725699A (en) * 1986-11-10 1988-02-16 Houdeshell Donald D Low rotary speed detecting switch
CN106745535A (zh) * 2016-12-30 2017-05-31 福州品行科技发展有限公司 一种动作感应式富氢水杯

Also Published As

Publication number Publication date
BE563053A (US06342305-20020129-C00040.png)
CH336110A (de) 1959-02-15
DE1052505B (de) 1959-03-12
GB829893A (en) 1960-03-09
FR1190110A (fr) 1959-10-09

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