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Switching device

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Publication number
US2807692A
US2807692A US54770555A US2807692A US 2807692 A US2807692 A US 2807692A US 54770555 A US54770555 A US 54770555A US 2807692 A US2807692 A US 2807692A
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Grant
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Prior art keywords
lever
knob
switch
position
portion
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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
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Edward S Leslie
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RCA Corp
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RCA Corp
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00Mechanisms for operating contacts
    • H01H3/02Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/20Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch wherein an auxiliary movement thereof, or of an attachment thereto, is necessary before the main movement is possible or effective, e.g. for unlatching, for coupling
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/20Control lever and linkage systems
    • Y10T74/20576Elements
    • Y10T74/20582Levers
    • Y10T74/2063Stops
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/20Control lever and linkage systems
    • Y10T74/20576Elements
    • Y10T74/20924Controller checks

Description

Sept- 24, 1957 E. s. LESLIE 2,807,692

SWITCHING DEVICE Filed Nov. 18, 1955 INVENTOR. .EDIVARD JJBJ'LE ATYUKJVEX illnited States Patent f.

SWITCHING DEVICE Edward S. Leslie, Van Nuys, Calif., assignor to Radio I This invention relates to switching devices, and particularly to a three-position switch having a positive off, or neutral, position intermediate its two on positions.

In electrical circuits, particularly those which control the energization of motors for driving a load in forward and reverse directions, switches, such as the toggle type, are frequently used. In these motor systems, sudden reverse energizations of the driving motor can cause damage to the load driven thereby. This is particularly true when the motors drive film transport mechanisms in recorders, reproducers, and similar apparatus.

The present invention may be an integral part of, or an adjunct to, a standard toggle switch which prevents a sudden change in a circuit, such as a motor energization circuit. The switch is suitable in places where space is limited. With the switch in one energization position, it cannot be thrown to its second energizing position without rotation of the switch handle 180 degrees. This prevents the sudden or rapid reversing of the circuits by providing a safety delay action between the two energizing positions.

The principal object of the invention, therefore, is to provide an improved switching device which prevents a sudden or rapid reversal of electrical circuits.

Another object of the invention is to provide an improved three-position switch which prevents the rapid actuation thereof between two energizing positions.

A further object of the invention is to provide a switch knob or control element for a toggle switch which prevents the toggle switch from being rapidly actuated between its two energizing positions.

The novel features which are believed to be characteristic of this invention, both as to the manner of its organization and the mode of its operation, will be better understood from the following description when read in conjunction with the accompanying drawings, in which:

Fig. l is a side view, partially in cross-section, of a switching device embodying the invention, the device being shown in one on position;

Fig. 2 is a view similar to Fig. 1 showing the switch in its 0 or neutral, position;

Fig. 3 is a view similar to Figs. 1 and 2 showing the switch in a second on position;

. Fig. 4 is a cross-sectional end view taken along the line 4-4 of Fig. 2;

Fig. 5 is a cross-sectional view taken along the line 55 of Fig. 4; and

Figs. 6 and 7 are end views of the switch knob when the switch is in its two on positions.

Referring, now, to the drawings in which the same reference numerals identify like elements, a standard type of toggle switch 5 is shown mounted on a panel 6 by a threaded stud 7 and a nut 8. The switch has the usual type of tapered actuating lever9 which will reverse the electrical circuits connected to the switch 5 over conductors 10.

On the lever 9 is mounted a T-shaped knob, shown 2,807,692 Patented Sept. 24, 1957 generally at 11, and having a substantially cylindrical body portion 13 and a larger diameter cylindrical portion 14. The portion 14 has a 180 degree face portion 15 thereof at an angle to the axis of the body portion 13. The body portion has flattened sides 16 and 17 diametrically opposite one another to facilitate the hand actuation of the knob.

The body portion '13 has a cylindrical recess 19 therein within which is a split sleeve 20 internally tapered to accommodate the lever 9. The sleeve 20 has a cross end portion 21 with a tapered face to correspond with the face 15. The sleeve 20 is held in position on the lever 9 by a pair of set screws 23 and 24, as shown in Fig. 5. The sleeve 20 is split at 25, as shown in Fig. 4, to permit the assembling thereof on the lever 9. There is sufficient friction between the sleeve 20 and the lever 99 to prevent the accidental rotation of the knob on the lever, but which permits the rotation of the knob when turned manually.

With the above construction, it is necessary that the switch be rotated 180 degrees before it can be actuated between the position shown in Fig. 1 and the position shown in Fig. 3. For instance, when the lever 9 is thrown from its on position in Fig. l to its 0 position, such as shown in Fig. 2, the side of the portion 14 perpendicular to the axis of the knob comes in contact with the adjacent surface of the panel 6, preventing further movement of the lever 9. Now, to throw the lever 9 to its other on position, the knob 11 must be rotated 180 degrees, as shownin Fig. 3, which permits the lever 9 to be moved to its other on position. Thus, a standard toggle switch is provided with a safety knob which prevents the sudden actuation thereof between its two on positions, the delay required preventing damage to reversible equipment. The safety knob occupies very little additional space to that required by the standard switch so that it may be used on panels where minimum space is available.

I claim:

1. A switching device comprising a panel, a switch mechanism on said panel and adapted to be thrown to two different on positions and to an intermediate off position, said mechanism including an actuating lever, said lever having its axis perpendicular to said panel when in said off position and at an angle to said panel when in said on positions, a knob mounted on said lever and having a portion of one endsurface of said knob perpendicular to the axis of said lever and knob, and another portion of said end surface of said hub diametrically opposite said perpendicular surface at an angle less than degrees to said axis, and means for attaching said knob to and for rotation on said lever.

2. A switching device in accordance with claim 1 in which said last-mentioned means includes a split sleeve adapted to surround said lever and occupy a recess in said knob.

3. A switching device comprising a panel, a switch mechanism on said panel and adapted to be thrown to two different on positions and to an intermediate 01f position, said mechanism including an actuating lever, said lever having its axis perpendicular to said panel when in said oh? position and at an angle to said panel when in said on positions, a knob mounted on said lever and having a portion of one end surface thereof perpendicular to the axis of said lever, and another portion of said end surface diametrically opposite said perpendicular surface at an angle less than 90 degrees to said axis, means for attaching said knob to and for rotation on said lever, said last-mentioned means including a split sleeve adapted to surround said lever and occupy a recess in said knob, said sleeve has an end surface at the same angle having the 3 angle surface of said knob, said angle permitting said lever to be actuated to either of its on positions when said angle surfaces are in certain positions.

4. A switch actuating knob unit for a switch lever comprising an elongated body portion of a certain size and 'an end portion extending at right angles away from said body portion, said portions having a eylindrical opening extending from one end thereof, said opening being adapted to accommodate said lever, said end portion having a portion of its end surface perpendicular to the axis of said knob unit and said lever and another portion of said end surface at an angle less than 90 degrees to said axis.

5. A switch actuating knob unit in accordance with claim 4 in which a sleeve is provided between said lever and the inner surface of said opening to hold said knob unit on said lever and permit rotation of said knob unit on said lever.

References Cited in the file of this patent UNITED STATES PATENTS 2,385,304 Schyrnik Sept. 18, 1945

US2807692A 1955-11-18 1955-11-18 Switching device Expired - Lifetime US2807692A (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2919334A (en) * 1958-05-05 1959-12-29 Kemper K Jones Extension operator for light switch
US3153707A (en) * 1960-10-10 1964-10-20 North American Aviation Inc Toggle switch locking device
US3197581A (en) * 1962-06-06 1965-07-27 Square D Co Two piece handle locking device each with portions interlockable with the other
US3201557A (en) * 1962-02-13 1965-08-17 Ite Circuit Breaker Ltd Circuit breaker handle assembly with improved force transfer characteristics
US3604868A (en) * 1970-07-30 1971-09-14 Pollak Corp Joseph Locking toggle switch
US3617676A (en) * 1970-06-24 1971-11-02 Arrow Hart Inc Switch handle for field assembly
US4367386A (en) * 1981-01-12 1983-01-04 Carlingswitch, Inc. Snap-on actuator for miniature toggle switch
US4411845A (en) * 1981-05-30 1983-10-25 Nippondenso Co., Ltd. Throttle valve assembly
US4686339A (en) * 1986-02-24 1987-08-11 Carlingswitch, Inc. Snap-on actuator for toggle switch
US4973801A (en) * 1990-01-10 1990-11-27 Burle Technologies, Inc. Interlocked motion detector wall switch
US5122624A (en) * 1991-01-23 1992-06-16 Benda Steven J Circuit breaker block out
US5357070A (en) * 1993-07-26 1994-10-18 Parsons Jr William H Slide switch on-off indicator and lock apparatus
US20070084705A1 (en) * 2005-10-14 2007-04-19 Marshall Christopher R Apparatus and methods for securing switch devices

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2385304A (en) * 1944-09-30 1945-09-18 Ite Circuit Breaker Ltd Shockproof switch

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2385304A (en) * 1944-09-30 1945-09-18 Ite Circuit Breaker Ltd Shockproof switch

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2919334A (en) * 1958-05-05 1959-12-29 Kemper K Jones Extension operator for light switch
US3153707A (en) * 1960-10-10 1964-10-20 North American Aviation Inc Toggle switch locking device
US3201557A (en) * 1962-02-13 1965-08-17 Ite Circuit Breaker Ltd Circuit breaker handle assembly with improved force transfer characteristics
US3197581A (en) * 1962-06-06 1965-07-27 Square D Co Two piece handle locking device each with portions interlockable with the other
US3617676A (en) * 1970-06-24 1971-11-02 Arrow Hart Inc Switch handle for field assembly
US3604868A (en) * 1970-07-30 1971-09-14 Pollak Corp Joseph Locking toggle switch
US4367386A (en) * 1981-01-12 1983-01-04 Carlingswitch, Inc. Snap-on actuator for miniature toggle switch
US4411845A (en) * 1981-05-30 1983-10-25 Nippondenso Co., Ltd. Throttle valve assembly
US4686339A (en) * 1986-02-24 1987-08-11 Carlingswitch, Inc. Snap-on actuator for toggle switch
US4973801A (en) * 1990-01-10 1990-11-27 Burle Technologies, Inc. Interlocked motion detector wall switch
US5122624A (en) * 1991-01-23 1992-06-16 Benda Steven J Circuit breaker block out
US5357070A (en) * 1993-07-26 1994-10-18 Parsons Jr William H Slide switch on-off indicator and lock apparatus
US20070084705A1 (en) * 2005-10-14 2007-04-19 Marshall Christopher R Apparatus and methods for securing switch devices
US20080105521A1 (en) * 2005-10-14 2008-05-08 L-3 Integrated Systems Company Apparatus and methods for securing switch devices
US7371980B2 (en) * 2005-10-14 2008-05-13 L 3 Communication Integrated Systems Lp Apparatus and methods for securing switch devices

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