US3588412A - Switch device including damping means - Google Patents

Switch device including damping means Download PDF

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Publication number
US3588412A
US3588412A US804156A US3588412DA US3588412A US 3588412 A US3588412 A US 3588412A US 804156 A US804156 A US 804156A US 3588412D A US3588412D A US 3588412DA US 3588412 A US3588412 A US 3588412A
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US
United States
Prior art keywords
contact
spring
cylinder
friction
switch device
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
US804156A
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English (en)
Inventor
Wolfgang Koennecke
Gerhard Schleifenbaum
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.)
Hundt and Weber GmbH
Original Assignee
Hundt and Weber GmbH
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 Hundt and Weber GmbH filed Critical Hundt and Weber GmbH
Application granted granted Critical
Publication of US3588412A publication Critical patent/US3588412A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H1/225—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member the supporting member being pivotable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position

Definitions

  • the closing of the contacts is basically an advantage because creeping contact ac tion is surely prevented.
  • it is of disadvantage in that the hard impact activated by large forces on the contact during closing creates recoil effects, which could cause bouncing in the contact areas and, therefore, causes a considerable burning of the contacts with high electric currents by switchon under high loads.
  • the hard impact forces created by closing of the contacts require special expensive designs for the housing carrying the contact element and its mounting.
  • Another object of this invention is the provision of a switch device in which burning of the contact areas is substantially eliminated.
  • a further object of the present invention is the provision of a switch device giving the benefits of high contact forces, but allowing the mounting of the elements in relatively simple and inexpensive housings.
  • the present invention directs itself to the task of reducing the burning of switch contacts by closing of the contacts; this is achieved by arranging damping devices parallel to the springs, which give impact to the movable contact.
  • the recoil effect is dampened or completely eliminated, which, otherwise, is present with common contact devices.
  • the stationarycontacts are mounted elastically. It is of advantage to provide the stationary contact with a damping device.
  • damping devices are designed as a throttling passage of small diameter within a fluid cylinder. It has proven beneficial to use damping devices having friction areas working against each other under tension.
  • a cylinder is used consisting of material with a high friction coefficient surrounded by a hollow cylinder which, for achieving elastic friction, is slotted longitudinally along the surface and is provided with a resilient ring surrounding its free end for providing elasticity.
  • a hollow cylinder is used formed of material with a high friction coefficient which surrounds a cylindrical bolt. Hollow cylindrical halves are pressed radially against the cylindrical bolt by surrounding springs, so that a constant friction lock of long duration is secured and also automatic adjustment for wear.
  • An especially simple design results in the use of a hollow member having a conical outside shape on which surrounding support members which are in tension are in the axial direction.
  • a pressure spring consisting of conically-wound coils where the spring is used as support area and, at the same time, the remainder ofthe coil guarantees the tension.
  • the contact holder for the movable contact can be designed preferably as cantilevered leaf springs in layers. It is beneficial in the use of leaf springs to equip at least the support area for the spring with a roughed surface.
  • FIG. 1 is a sectional view of s switch device embodying the principles of the present invention
  • FIG. 2 is a sectional view of a modified form of the invention
  • FIG. 3 is a sectional view of another version of the invention.
  • FIG. 4 shows a further modification of the invention.
  • FIG. II which best shows the general features of the invention
  • a contact arm 1 of a circuit breaker is shown as carrying a movable contact element 3 on a carrier 2 having the shape of an angle.
  • This movable contact element 3 is equipped at its underside with a contact piece d.
  • the contact arm stretches through the opening 5 of the carrier 2.
  • the opening in its upper area is slot-shaped and has a narrow area 6 surrounding the contact arm 1 nd is adjustable in height.
  • the opening 5 on its base is broadened to permit the withdrawal of the carrier from the contact arm.
  • the movable contact element 3 is maintained in tension by the spring 7.
  • the spring supports itself with its upper end on a spring disc 8 which, with its collar, surrounds a cylinder 9 made from a material with high friction coefficient, such as is commonly used for brake and clutch linings.
  • the lower end of the spring is supported on a collar of hollow cylinder 10, which, in turn, is fixedly mounted by use of a rivet head keeping the. connection between the carrier 2 and movable contact element 3.
  • the in side diameter of the hollow cylinder 10 is adjusted to the outside diameter of cylinder 9 insuch a way that it surrounds cylinder 9 by a friction lock under sutfficient tension.
  • the hollow cylinder 10 is designed elastically; this is achieved by providing slots 11 along the surface line.
  • a spring ring 12 is inserted into a groove surrounding the hollow cylinder.
  • the stationary contact element 13 is connected with a terminal 14' and supported by a spring 15, so that the contact element 13 is still somewhat swingable.
  • Underneath the contact part 16 of the stationary contact element 13 is a groove 18 which is worked into the housing 17.
  • a spring leaf 20 is embedded in the groove and keeps the stationary contact element in tension by means of the screw 19.
  • the movable contact element 3 By closing of the contact elements and by the action of strong springs acting on the contact arm 1, the movable contact element 3 is accelerated in the direction of contact element 13. In the phase of touching of contact part 4 and 16, a motion impulse will be carried over, which would have a recoil effect on the movable contact part if contact 13 was supported rigidly.
  • the contact 13 By the elastic support of the stationary contact 13 by leaf springs, according to this invention, the contact 13 will first retract a small distance and, during action of further movement of the contact arm, the movable contact will additionally follow up. The actual impact of the contact parts is, therefore, already reduced. The tendency to impact vibration is completely eliminated.
  • the leaf spring 20 does not only take in mass forces within the first moment of contact and permit a small retraction of the contact part 16 of the stationary contact element 13, but the leaf spring is shaped in such a way that its free ends, the ends positioned on the underneath of stationary contact 13, are bent and displaced and, therefore, draw energy form the system by friction.
  • the damping device increases the pressure and makes it difficult to release the contact pieces from each other or may take the release impossible.
  • energy is drawn off from the system and the number of rebouncings is-reduced at least to one.
  • the additional absorption and damping of the stationary contact element permits interception of the sudden stress within the small spring deflection activated by the impact of the movable contact by its mass inertia. Therefore, the forces released during impact are considerably reduced and necessary requirements for strength in the mounting devices for the stationary contact elements 13, i.e., the housing supporting the contact, can be considerably reduced.
  • the central arrangement of the damping devices and springs assure that both act equiaxially and are positioned symmetrically to the contact pieces 4,16.
  • FIG. 2 A modification of the invention, also using friction surface and a damping device for the movable contact element 3 can be seen in FIG. 2.
  • a support piece 21 is riveted in a recess arranged on the upper side of the movable contact element 3, which surrounds, with its inside collar, a bolt 22 designed with an enlarged shoulder on its lower end.
  • On the bolt is arranged a friction cylinder 23 supported and adjustable lengthwise by means of the threaded upper section of the bolt.
  • the friction cylinder extends through the opening in the contact arm 1 and overlaps and limits the stroke of contact piece 3 which is maintained in tension by the spring 7.
  • the friction cylinder is surrounded by two half shells 25 of friction material and encloses the cylinder by means of small slots in the direction parallel to the axis.
  • the half shells 25 have conical outside surfaces 26 on which rest the coils of the spring 7 which expand towards the end.
  • the spring 7 brings the half shells 25 into tension in the axial direction against the support arm 1 and has a tendency to push the half shells so far to the top that not only the spring rests on the support arm, but the support arm also rests on the upper collar of the friction cylinder 23.
  • the desired stroke may be adjusted and its position fixed by tightening the counter screw 24.
  • a radial directed force acts on the surface of friction cylinder 23 which presses the friction halfshells tightly with constant force during operation against the friction cylinder 23.
  • the design of the lower bolt 22 with its collar assures a certain swingability of the movable contact 3 around a small angle, so that, by support of the contact parts, it may adjust itself to the large support area.
  • the design shown in FIG. 2 achieves a constant damping over a long period of time with a small number of parts. It also makes possible the support of the movable contact element 3 on the arm 1 by the adjusting means.
  • FIG. 3 another clamping device is shown using a hydraulic cylinder 28 with a closing cover 27.
  • a piston rod 29 is sealed by a packing 30 and guided by the cover connected with a spring disc 8. Because of its simple design, no throttle hole or fluid canals are shown.
  • the tolerances of the piston are selected in such a way that by operating with a pressure fluid, the desired damping effect is achieved. Also, the friction occurring by use of the packing 30 is very light, but this increases the action of the damping device, anyway.
  • FIG. 4 A further variation of the invention is shown in FIG. 4.
  • the insulated square shaft 31 connected with the switch lock of a circuit breaker transfers the movements to the contact arms of the contact pairs arranged for the individual terminals and is locked together by a clamp which is connected to a number of leaf springs.
  • a support 34 fitted to the leaf springs is attached to the movable contact element 3.
  • the individual leaf springs are separated by spacers 35 to achieve a large base for the triangular spring bundle formed by the leaf springs.
  • the leaf springs are shaped in such a way that their free ends, by supporting each other, achieve large areas of support against each other.
  • the leaf springs are made of equal length so that they may be surrounded by the support 34.
  • damping devices By inclusion of damping devices in accordance with this invention, the activated placing of contacts to contact devices on electrical switch devices, the bouncing during impact is suppressed or extensively reduced. Contact burning is practically eliminated.
  • the action of the damping device is increased by mounting the second contact springs where a damping device works parallel to the spring. By the use of this invention, the life of the contact elements may be improved considerably.
  • a switch device comprising:
  • a damping device operatively arranged with the spring means and including a first cylinder whose outer surface is of high friction coefficient, a second hollow cylinder surrounding said first cylinder, said second cylinder being slotted lengthwise, and a ring which surrounds and constricts the free end of the second cylinder.
  • a switch device comprising:
  • a damping means operatively arranged with the spring means and including a hollow cylinder formed of half shells of a material with a high friction coefficient and a cylindrical bolt surrounded by said hollow cylinder.

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  • Springs (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Tumbler Switches (AREA)
US804156A 1968-03-07 1969-03-04 Switch device including damping means Expired - Lifetime US3588412A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEH0065518 1968-03-07
DE19681640431 DE1640431A1 (de) 1968-03-07 1968-03-07 Kontaktvorrichtung fuer elektrische Schaltgeraete

Publications (1)

Publication Number Publication Date
US3588412A true US3588412A (en) 1971-06-28

Family

ID=25754015

Family Applications (1)

Application Number Title Priority Date Filing Date
US804156A Expired - Lifetime US3588412A (en) 1968-03-07 1969-03-04 Switch device including damping means

Country Status (4)

Country Link
US (1) US3588412A (enrdf_load_stackoverflow)
DE (1) DE1640431A1 (enrdf_load_stackoverflow)
FR (1) FR2003412A1 (enrdf_load_stackoverflow)
GB (1) GB1265201A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4149129A (en) * 1977-06-08 1979-04-10 Square D Company Contact control assembly for a circuit breaker
US4443950A (en) * 1981-12-23 1984-04-24 Cockeram Eugene A Precision saw blade adjustment device
CN106783243A (zh) * 2017-02-07 2017-05-31 王心竹 一种新型分体式防水衡压开关静接点组
WO2020257470A1 (en) * 2019-06-21 2020-12-24 Cummins Power Generation Ip, Inc. Flat force blow-on switch

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3486003T2 (de) * 1983-05-09 1993-07-01 Cge Spa Schalter-kontaktstruktur.
FR2892849B1 (fr) * 2005-10-28 2013-12-20 Hager Electro Sas Mecanisme a serrure pour appareil electrique
FR3012911A1 (fr) * 2013-11-04 2015-05-08 Eur Ohm Commutateur electrique
CN110242890B (zh) * 2018-03-07 2024-02-02 合肥美亚光电技术股份有限公司 灯具固定装置及具有其的灯具

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4149129A (en) * 1977-06-08 1979-04-10 Square D Company Contact control assembly for a circuit breaker
US4443950A (en) * 1981-12-23 1984-04-24 Cockeram Eugene A Precision saw blade adjustment device
CN106783243A (zh) * 2017-02-07 2017-05-31 王心竹 一种新型分体式防水衡压开关静接点组
WO2020257470A1 (en) * 2019-06-21 2020-12-24 Cummins Power Generation Ip, Inc. Flat force blow-on switch
GB2599563A (en) * 2019-06-21 2022-04-06 Cummins Power Generation Ip Flat force blow-on switch
CN114503231A (zh) * 2019-06-21 2022-05-13 康明斯发电Ip公司 扁平力通电感应开关
GB2599563B (en) * 2019-06-21 2024-05-22 Cummins Power Generation Ip Flat force blow-on switch
CN114503231B (zh) * 2019-06-21 2024-08-09 康明斯发电Ip公司 扁平力通电感应开关
US12074002B2 (en) 2019-06-21 2024-08-27 Cummins Power Generation Ip, Inc. Flat force blow-on switch

Also Published As

Publication number Publication date
GB1265201A (enrdf_load_stackoverflow) 1972-03-01
DE1640431A1 (de) 1970-07-16
FR2003412A1 (enrdf_load_stackoverflow) 1969-11-07

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