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Publication numberUS2246919 A
Publication typeGrant
Publication dateJun 24, 1941
Filing dateJul 11, 1940
Priority dateJul 11, 1940
Publication numberUS 2246919 A, US 2246919A, US-A-2246919, US2246919 A, US2246919A
InventorsKrantz Hubert K
Original AssigneeBell Telephone Labor Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Latching device
US 2246919 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

June 24, 192,11. H. K. KRANTZ LATCHING DEVICE Filed July ll, 1940 F/GIZ /NVE/vro@ l A. KRA N TZ ATTQR/VEV Patented June 24, 1941 LATCHING DEVICE Hubert K. Krantz, Rockville Centre, N. Y., assignor to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of N ew York A@application .uly 11, 1940, Serial No. 344,891

(Cl. 7d- 532) 9 Claims.

This object is attained, in accordance with a feature of the invention, by pivotally mounting a centrally apertured -guard member on the faceplate of the switching key and providing thereon an integral bolt or latch which, when the key lever is moved to any of its switching positions,

is automatically moved in behind the lever shank to lock the lever in its operated position.

Another feature of the invention resides in a novel type of spring biasing arrangement for maintaining the guard in its latching position.

A' further feature of the invention is embodied in a finger-grip, formed integrally with the guard, which facilitates the movement of the guard from its latching position.

These and other features of the invention will be readily understood from the following dee tailed description made with reference to the accompanying drawing, in which:

1 is a side elevation of the key-guard of this invention associated with a three-position lever type key, and shows the guard in its latching position;

Fig. 2 is a top view of the structure disclosed in Fig. 1;

Fig. 3 is a top view, corresponding to Fig. 2,

and illustrates the guard in its unlatching position;

Fig. 4 is an end view 'of the structure shown in Figs. 1 and 2; and

Fig. 5 is an end view of the structure shown in Fig. 3.

In the drawing, the key-guard I5 is shown mounted on the key face-plate Eil by means of the shoulder pins I6 and.' i8, The shank of shoulder pin I5 passes through a circular hole at one end of the guard and is screwed into, or otherwise permanently associated with the faceplate. The -guard is capable of pivotal movement about the pin IB. At its other end, the

guard is provided with a slot I l, which is slightly I;

arcuate. The shank of shoulder pin I8 passes through this slot and is xedly associated with the face-plate Ill. The extent to which the guard may be pivotally moved about the pin I6 is limited bythe length of slot Il. To permit the movement of the guard by hand, a finger-piece 22 is integrally formed on the guard and located near the slotted end thereof. The bosses 23, formed integrally with, and located on the under- 3 side of the guard, provide bearing surfaces for the guard in its movement over the face-plate.

The :guard I5 may be stamped or otherwise formed of sheet metal. A substantial portion of the metal is removed from the center of the guard to furnish an aperture I9 through which a portion of the lever I2 and its handle supporting shank I3 protrude when the guard is in position on the key structure. At the upper edge (viewing Figs. l and 2) of the aperture I9, the metal is turned up at right angles toform a substantially semi-elliptical integral projection 2), midway of whose curved edge there is formed an inwardly projecting bolt or latch 25. At the junction of the portion 2@ and the main portion of the guard l5, a small aperture or slot 26 is provided, through which a humped portion 2 of spring 28 protrudes. The spring 28 is located between the face-plate It and the guard I5 and has one end partially encircling the shank of shoulder pin i6, while the other end is terminated in a hook which nts around the shank of shoulder pin I8 and is free to move longitudinally, relative to the pin I8.

In Figs 1 and 2, the key lever has been actuated to one of its switching positions. Prior to such operation the key lever would occupy the normal position illustrated in Fig. 3. In this position, the front edge of latch 25 abuts the shank i3 of the lever, as clearly shown in Fig. 5, and the spring 28 is boweddue to the action of the back face of projection 2li on the spring hump 2l when the guard is caused to pivot about the pin It.I During this action on the spring 28, the hooked end thereof moves from the position illustrated in Fig. 2 to that shown in Fig. 3. Thus, when in the position shown in Fig. 3, the guard i5 is held, under the tension of spring 28, with the edge of latch 25 abutting the lever shank i5. rWhen the lever is actuated to the right or left from its mid-position, the lever shank i3 rides oli the latch 25 and, under the action of spring 23, the latch is snapped into position behind the lever shank to effectively lock the lever in its actuated position.

In the event that the key must be operated from either of its actuated positions to its other actuated position, or to its mid-position, the guard is pivotally moved about the pin I6, the operator or attendant pushing on the iinger-grip 22 with one hand and grasping the knurled handle I4 of the key with the other hand and moving it to the new position. Pivotal movement of the guard removes the latch 25 from the operating path of the lever shank I3, thus permitting unimpeded movement of the lever. When the lever is moved to its new position, the guard is released so that, under the action of spring 28, the latch snaps into position behind the lever, if the lever is now in one of its actuated positions, or into engagement with the lever shank I3, should the lever have been moved to its mid-position.

The face-plate Ill is provided with a series of holes II through which screws or the like may be passed for engagement with the frame 33 which supports the key structure. It is to be `understood that the particular structural details of the :key may be of any well-known design. vThe key which applicant has elected to disclose is of the well-known lever type in which an inverted U-shaped mounting bracket or frame 33 is used, and between the legs of which the circuit controlling springs are mounted. The bridge of the U-shaped bracket 33 is secured to the face-plate I .in any suitable manner and 1s provided'with two oppositely disposed depending integral lugs 34 upon which the contact operating lever is pivotally mounted, the said lever carrying means for electrically bridging certain of the contact springs or for otherwise actuating the Contact springs.

What is claimed is:

l. In combination, a switching key having an operating lever capable of occupying a mid-position and a plurality of alternate positions, a supporting member for said key, and a locking device comprising a guard pivotally supported on said supporting member and arranged to pivot about one end between two eXtreme positions, means carried by said guard .and contacting said lever when said lever is in its mid-position whereby said guard is held in one of its extreme positions, and means elective when said lever is moved to an alternate position to cause said guard to automatically assume its other eXtreme position whereupon said first-mentioned means locks said lever in its alternate position.

2. In combination, a switching key having an operating lever .capable of occupying a mid-position and a plurality of alternate positions, a supporting member for said key, and a locking device comprising a guard pivotally supported on said supporting member and arranged to pivot about one end between two extreme positions, a latch carried by said guard engaging said lever when said lever is in its Amid-position whereby said guard is held inone of its extreme positions, and vmeans effective when said lever is moved to an alternate position for causing said guard to automatically assume its 'other eXtreme position whereupon said latch engages said lever in its alternate position and locks it therein.

3. In combination, a switching key having an operating lever capable of occupying a mid-posi tion and a plurality of alternate positions, a supporting member for said key, and a locking device comprising a guard supported on said supporting member and varranged to pivot about one end between two extreme positions, a latch carried by said guard engaging said lever when said lever is in its mid-position whereby said guard is held in one of its extreme positions, and a spring effective when said lever is moved to an alternate position for causing said guard to automatically assume its other extreme position whereupon said latch engages said lever in its alternate position and locks it therein.

4. In combination, a switching key having an operating lever capable of occupying a mid-position and a plurality of alternate positions, a supporting member for said key, and a locking device comprising a guard supported on said supporting member and arranged to pivot about one end between two extreme positions, a latch carried by said guard engaging said lever when said lever is in its mid-position whereby said guard is held in one of its extreme positions, a spring effective when said lever is moved to an alternate position for causing said guard to automatically assume its other extreme position whereupon said latch engages and locks said lever in its alternate position, and means for manually moving said guard so as to move said latch in disengaged relation from said lever.

5. In combination, a switching key having an operating lever capable of occupying a midposition and a plurality of alternate positions, a supporting member for said key, and a locking device comprising a guard supported by said supporting member and arranged to pivot .about one end ybetween two extreme positions, a latch carried by said guard engaging said lever when said lever is in its mid-position whereby said guard is 'held in one of its extreme positions, a spring elective when said lever is moved to an alternate position for `causing said guard to automatically assume its other extreme position whereupon said latch is positioned relative to said lever so as to lock said lever in its alternate position, means for manually moving said guard so as to move said latch clear of said lever, and means comprising a slot in said guard and a shoulder pin supported by said supporting member and operating in the slot for dening the two extreme positions of said guard.

6. In combination, a switching key having an operating lever capable of occupying a mid-posi tion and a plurality of alternate positions, a supporting member for said key, a face-,plate carried by said supporting member and having a centrally located aperture through which said operating lever protrudes, and a locking device comprising a guard pivotally supported at one end on said falce-plate and having an aperture through which said lever protrudes, a latch integrally formed with said guard and extending inwardly from the center of one of the defining edges of the guard aperture and -located in the line of travel of said lever when said lever is in an alternate position, means for limiting the pivotal movement of said guard comprising a shoulder pin carried on said face-.plate and a slot in the guard in which the shoulder pin functions, `an aperture in said guard in alignment with said latch, and means for maintaining said latch in the line of travel of said lever when said lever is in an alternate position, comprising a spring extending between the pivot support of said guard and said shoulder pin and having a portion thereof projecting through said lastmentionedt guard aperture and contacting said guard at a point in `alignment with said latch.

v'7. In combination, a multiposition switching key, a supporting frame, an operating member for said key journaled in the supporting frame and adapted to occupy a normal mid-position and a plurality of alternate positions, and means for locking the operating member in any of its alternate positions comprising a pivotally mounted guard member having an aperture through which the operating member protrudes, a latch integrally formed with said/guard and abutting said operating member when the latter is in its mid-position, and means effective when said operating member is moved to any of its alternate positions for lcausing said guard latch to be moved into a position behind the operating member to effectively lock the operating member in its alternate position.

8. In combination, a multiposition switching key, a supporting frame, an operating member for said key journaled in the supporting frame and adapted to occupy a normal mid-position and a plurality of alternate positions, and means for locking the operating member in any o-f its alternate positions comprising a guard having a centrally located aperture, means for pivotally supporting said guard at one end in a position such that the operating member protrudes though the aperture, means comprising a slot in one end of said guard and a cooperating pin which limits the extent of the pivotal movement of the guard about its pivot support, a latch carried by said guard and adapted to abut the operating member when the operating member is in its mid-position, and means comprising a spring carried 'by said pin and said pivot support and arranged to hol-d said latch and said operating member in abutting relation when the operating member is in its mid-position and to force said latch into a position corresponding to the mid-position of said operating member when said operating member is moved to an alternate position.

9. In combination, a multiposition switching key having an operating member, a mounting` plate for said key, a face-plate secured to said mounting plate and having an aperture through which said operating member protrudes, and means for locking the operating member in an operated position, comprising a guard member mounted on and in superposed relation to said face-plate and having an aperture in substantial alignment with the face-plate aperture, a shoulder pin for pivotally supporting one end of said guard on said face-plate, a second shoulder pin cooperating with a slot in the other end of said lguard in limiting the pivotal movement of said guard about its pivot support, a latch integrally formed with said guard and occupying a position in the line of travel of said operating member when said operating member is in an operated position, and means comprising a iinger-grip integrally formed on said guard at the slotted end thereof for facilitating the manual movement of said guard and to remove the latch from the line of travel of said operating member, whereby said operating member may be moved to another operated position.y

HUBERT K. KRANTZ.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2578317 *Jul 30, 1948Dec 11, 1951Beaver Pipe Tools IncSwitch lock for power driven tools
US2588565 *Nov 13, 1948Mar 11, 1952Beaver Pipe Tools IncSwitch lock for power-driven tools
US2624895 *Jun 17, 1949Jan 13, 1953Beaver Pipe Tools IncPower drive
US2817720 *Aug 30, 1955Dec 24, 1957Gen Motors CorpElectric window regulator safety switch
US2885905 *Feb 15, 1956May 12, 1959Cutler Hammer IncDetachable lever locking devices for electric switches
US3246909 *Apr 10, 1964Apr 19, 1966Pioneer Gen E Motor CorpHandle mounting assembly for lawn mowers and the like
US4187420 *May 17, 1978Feb 5, 1980Eaton CorporationRocker switch with selective lockout means shiftable transversely of the pivotal axis
US4297914 *May 12, 1980Nov 3, 1981International Harvester CompanyControl lever gate with lever restraint
US4454412 *Feb 1, 1983Jun 12, 1984Pitney Bowes Inc.Encoder/actuator for postage meter
US4468544 *Jul 25, 1983Aug 28, 1984Anamae WainessSwitch lock
US5458021 *Dec 2, 1993Oct 17, 1995New Holland North America, Inc.Control lever neutral lock mechanism
US6759609Nov 10, 2003Jul 6, 2004Sharmaine Laura Lynn HendersonLockout for a rocker switch
Classifications
U.S. Classification74/532, 200/325, 200/318
International ClassificationH01H3/02, H01H3/20
Cooperative ClassificationH01H3/20
European ClassificationH01H3/20