US2246919A - Latching device - Google Patents
Latching deviceDownload PDFInfo
- Publication number
- US2246919A US2246919AUS344891AUS34489140AUS2246919AUS 2246919 AUS2246919 AUS 2246919AUS 344891 AUS344891 AUS 344891AUS 34489140 AUS34489140 AUS 34489140AUS 2246919 AUS2246919 AUS 2246919A
- Authority
- US
- United States
- Prior art keywords
- guard
- lever
- latch
- key
- alternate
- 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
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- 239000002184metalSubstances0.000description3
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Classifications
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
- H01H3/20—Operating 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
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/20—Control lever and linkage systems
- Y10T74/20576—Elements
- Y10T74/20636—Detents
- Y10T74/20666—Lever engaging
Definitions
- Another feature of the inventionresides in a novel type of spring biasing arrangement for maintaining the guard in its latching position.
- A' further feature of the inventionis embodied in a finger-grip, formed integrally with the guard, which facilitates the movement of the guard from its latching position.
- 1is 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. 2is a top view of the structure disclosed in Fig. 1;
- Fig. 3is a top view, corresponding to Fig. 2,
- Fig. 4is an end view 'of the structure shown in Figs. 1 and 2;
- Fig. 5is an end view of the structure shown in Fig. 3.
- the key-guard I5is shown mounted on the key face-plate Eil by means of the shoulder pins I6 and.' i8,
- the shank of shoulder pin I5passes through a circular hole at one end of the guard and is screwed into, or otherwise permanently associated with the faceplate.
- the -guardis capable of pivotal movement about the pin IB. At its other end, the
- guardis provided with a slot I l, which is slightly I;
- a finger-piece 22is integrally formed on the guard and located near the slotted end thereof.
- the :guard I5may 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 28is 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.
- the guardIn 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 Illis 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 33is 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.
- a switching keyhaving 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.
- a switching keyhaving 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.
- a switching keyhaving 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.
- a switching keyhaving 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.
- a switching keyhaving 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.
- a switching keyhaving 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
- a multiposition switching keya 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
- a pivotally mounted guard memberhaving 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.
- a multiposition switching keya 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
- a guardhaving 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.
- a multiposition switching keyhaving 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
- a guard membermounted 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.
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- Lock And Its Accessories (AREA)
Description
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. Thebosses 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 orlatch 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 ofspring 28 protrudes. Thespring 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 oflatch 25 abuts the shank i3 of the lever, as clearly shown in Fig. 5, and thespring 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 thespring 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 ofspring 28, with the edge oflatch 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 thelatch 25 and, under the action ofspring 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 thelatch 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 ofspring 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 theframe 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 orframe 33 is used, and between the legs of which the circuit controlling springs are mounted. The bridge of the U-shapedbracket 33 is secured to the face-plate I .in any suitable manner and 1s provided'with two oppositely disposed dependingintegral 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US344891AUS2246919A (en) | 1940-07-11 | 1940-07-11 | Latching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US344891AUS2246919A (en) | 1940-07-11 | 1940-07-11 | Latching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2246919Atrue US2246919A (en) | 1941-06-24 |
Family
ID=23352516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US344891AExpired - LifetimeUS2246919A (en) | 1940-07-11 | 1940-07-11 | Latching device |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2246919A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2578317A (en)* | 1948-07-30 | 1951-12-11 | Beaver Pipe Tools Inc | Switch lock for power driven tools |
| US2588565A (en)* | 1948-11-13 | 1952-03-11 | Beaver Pipe Tools Inc | Switch lock for power-driven tools |
| US2624895A (en)* | 1949-06-17 | 1953-01-13 | Beaver Pipe Tools Inc | Power drive |
| US2817720A (en)* | 1955-08-30 | 1957-12-24 | Gen Motors Corp | Electric window regulator safety switch |
| US2885905A (en)* | 1956-02-15 | 1959-05-12 | Cutler Hammer Inc | Detachable lever locking devices for electric switches |
| US3246909A (en)* | 1964-04-10 | 1966-04-19 | Pioneer Gen E Motor Corp | Handle mounting assembly for lawn mowers and the like |
| US4187420A (en)* | 1978-05-17 | 1980-02-05 | Eaton Corporation | Rocker switch with selective lockout means shiftable transversely of the pivotal axis |
| US4297914A (en)* | 1980-05-12 | 1981-11-03 | International Harvester Company | Control lever gate with lever restraint |
| US4454412A (en)* | 1979-12-28 | 1984-06-12 | Pitney Bowes Inc. | Encoder/actuator for postage meter |
| US4468544A (en)* | 1983-07-25 | 1984-08-28 | Anamae Wainess | Switch lock |
| US5458021A (en)* | 1993-12-02 | 1995-10-17 | New Holland North America, Inc. | Control lever neutral lock mechanism |
| US6759609B1 (en) | 2003-11-10 | 2004-07-06 | Sharmaine Laura Lynn Henderson | Lockout for a rocker switch |
| US20210358463A1 (en)* | 2020-05-18 | 2021-11-18 | Switchlock, LLC | Switch lock apparatus and method thereof |
- 1940
- 1940-07-11USUS344891Apatent/US2246919A/ennot_activeExpired - Lifetime
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2578317A (en)* | 1948-07-30 | 1951-12-11 | Beaver Pipe Tools Inc | Switch lock for power driven tools |
| US2588565A (en)* | 1948-11-13 | 1952-03-11 | Beaver Pipe Tools Inc | Switch lock for power-driven tools |
| US2624895A (en)* | 1949-06-17 | 1953-01-13 | Beaver Pipe Tools Inc | Power drive |
| US2817720A (en)* | 1955-08-30 | 1957-12-24 | Gen Motors Corp | Electric window regulator safety switch |
| US2885905A (en)* | 1956-02-15 | 1959-05-12 | Cutler Hammer Inc | Detachable lever locking devices for electric switches |
| US3246909A (en)* | 1964-04-10 | 1966-04-19 | Pioneer Gen E Motor Corp | Handle mounting assembly for lawn mowers and the like |
| US4187420A (en)* | 1978-05-17 | 1980-02-05 | Eaton Corporation | Rocker switch with selective lockout means shiftable transversely of the pivotal axis |
| US4454412A (en)* | 1979-12-28 | 1984-06-12 | Pitney Bowes Inc. | Encoder/actuator for postage meter |
| US4297914A (en)* | 1980-05-12 | 1981-11-03 | International Harvester Company | Control lever gate with lever restraint |
| US4468544A (en)* | 1983-07-25 | 1984-08-28 | Anamae Wainess | Switch lock |
| US5458021A (en)* | 1993-12-02 | 1995-10-17 | New Holland North America, Inc. | Control lever neutral lock mechanism |
| US6759609B1 (en) | 2003-11-10 | 2004-07-06 | Sharmaine Laura Lynn Henderson | Lockout for a rocker switch |
| US20210358463A1 (en)* | 2020-05-18 | 2021-11-18 | Switchlock, LLC | Switch lock apparatus and method thereof |
| US12073815B2 (en)* | 2020-05-18 | 2024-08-27 | Switchlock, LLC | Switch lock apparatus and method thereof |
| US20250316254A1 (en)* | 2020-05-18 | 2025-10-09 | Switchlock, LLC | Switch lock apparatus and method thereof |
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