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Publication numberUS3841675 A
Publication typeGrant
Publication dateOct 15, 1974
Filing dateAug 9, 1973
Priority dateAug 9, 1973
Publication numberUS 3841675 A, US 3841675A, US-A-3841675, US3841675 A, US3841675A
InventorsR Mercer
Original AssigneeGen Motors Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Dishwasher latch
US 3841675 A
Abstract
A latch for a dishwasher which includes, in addition to a fixed strike on the tub, a rotary cam having a perpendicular shaft extending to the outside of the door for manual rotation thereof and a latch pawl pivotable relative to the shaft to lock the shaft against rotation when the door is open but which is pivoted by the strike to release the shaft for rotation when the door is closed. As the cam is rotated with the door closed, one portion of the cam enters the strike to latch the door while another portion of the cam actuates a switch carried on the latch lever.
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Description  (OCR text may contain errors)

United States Patent 1191 Mercer 1 Oct. 15, 1974 [54] DISHWASHER LATCH Primar Examiner-Richard E. Moore 75 In t: R0brtL.M D t ,oh Y 1 ven or e ercer ay on Attorney, Agent, or FirmFrederick M. Ritchie [73] Assignee: General Motors Corporation,

Detrolt, Mich. [57] ABSTRACT [22] 1973 A latch for 21 dishwasher which includes, in addition is [21] Appl. No.: 386,960 a fixed strike on the tub, a rotary cam having a perpendicular shaft extending to the outside of the door for manual rotation thereof and a latch pawl pivotable 5 292/241 292/DIG' 13 3512 relative to the shaft to lock the shaft against rotation [58] Fie'ld DIG when the door is open but which is pivoted by the b strlke to release the shaft for rotation when the door is closed. As the cam is rotated with the door closed, one portion of the cam enters the strike to latch the [56] References Cited door while another portion of the cam actuates a UNITED STATES PATENTS switch carried on the latch lever.

3,005,065 10/1961 Jellies 292 0101 69 3,627,960 12/1971 Grabek 292 010. 69 2 Chums, 3 Drawmg Flgures 1 DISHWASHER LATCH This invention relates to a dishwasher and, more particularly, to a combination latch and switch actuating mechanism therefor which prevents the operation of said dishwasher until the dishwasher door is closed and latched.

In the dishwasher art, it is common practice to provide an interlock switch to prevent the operation of the water spray system until the dishwasher door is closed. The prior art also includes a combination latch and switch actuating mechanism to perform this job. This invention is directed to an improved mechanism of this type.

Accordingly, it is an object of this invention to provide an improved combination latch and switch actuating mechanism for a dishwasher wherein a latch operating shaft protrudes through the front panel of a dishwasher door for locking the door and accuating the switch by rotating the shaft.

Another object of this invention is the provision of a combination latch and switch actuating mechanism which includes a pivotable pawl that mounts the interlock switch for movement into and out of engagement with a switch actuating cam.

A further object of this invention is the provision for a dishwasher of a combination latch and switch actuating mechanism which includes a switch-carrying pivotable pawl having a lock pin thereon movable with respect to a channel on a latch operating shaft to prevent the rotation of the shaft and, thus, the actuation of said switch when the dishwasher door is open.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings wherein a preferred embodiment of the present invention is clearly shown.

IN THE DRAWINGS:

FIG. 1 is a front elevational view of a domestic dishwasher provided with this invention;

FIG. 2 is a fragmentary sectional view of the combination latch and switch actuating mechanism of this invention taken along line 2-2 in FIG. 1; and

F IG. 3 is an exploded view of the latch and switch actuating mechanism.

With reference to FIG. 1, the combination latch and switch actuating mechanism of this invention is shown combined with a dishwasher l0. Dishwasher 10 includes a door 12 hinged about an axis 14 along the lower edge thereof and enclosing a timer 16 for controlling a dishwashing cycle through periods of water spraying within a dishwasher tub 18.

The combination latch and switch actuating mechanism is shown most clearly in the exploded view of FIG. 3. The mechanism includes an actuator plate 22 attached as at 24 to'an adapter plate 26 on the top of the dishwasher tub adjacent the front opening 28 thereof. The actuator plate has a tongue portion 30 which projects from the front of the dishwasher tub for sensing the presence of the dishwasher door in its closed position as will be explained more fully hereinafter.

The actuator plate also includes an opening or latch strike 32 for receiving a latch cam bolt 34 as will be explained hereinafter.

A latching assembly 36 includes a U-shaped front bracket 38 adjacent a front panel of the dishwasher door and a U-shaped rear bracket 40 in face-to-face relationship with the front bracket and connected thereto to form spaced bearings 42, 44 and a pivot point or axis formed by openings 46. A switch mounting pawl is pivotally mounted on a pawl mounting pin 52 which extends through openings 46 in the front bracket forming the pivot axis. Spring 53 biases the pawl to pivot normally clockwise. Interlock switch 54 is mounted by screw 55 to a bottom leg on the pawl. Pawl 50 also has a central opening 56 from the sides of which lock pins 58, 60 project radially.

A latch shaft 64 extends through and is rotatably journaled in bearing collars 42, 44. Locking channels 68, in the shaft receive pins 58, 60 respectively as shaft 64 is inserted into the bearing collars of the brackets.

A latch cam 74 is attached to one end of latch shaft 64 and a latch handle 78 is attached to the other end of the shaft. Latch cam 74 includes a switch actuating cam portion 82 which is adapted to actuate an actuator 84 on interlock switch 54 and the aforementioned latch bolt portion 34 which is adapted to lockingly engage with strike 32.

In operation, it is desirable that latch handle 78 not be rotatable when door 12 is open. Conversely, when the door is closed, latch handle 78 should be rotatable to lock the door and actuate the interlock switch so that timer 16 may initiate and control a conventional dishwashing cycle.

Thus, when the dishwasher door 12 is open, pawl 50 is biased by spring 53in a clockwise direction in a manner tending to pivot switch 54 away from latch cam 74 and to engage lock pins 58, 60 in the locking channels 68, 70 of the shaft. This relationship of pin and channel prevents the rotation of shaft 64 and, thus, the rotation of cam portion 82 with respect to the switch actuator 84. Switch 54 remains open and timer 16 remains off.

When the dishwasher door 12 is closed, tongue 30 projects into the door where it engages pawl 50 above the pivot formed by pin 52. This causes the pawl to rotate counterclockwise against the bias of spring 53 and moves switch actuator 84 sufficiently close to cam portion 82 to enable actuation thereof upon rotation of the latch cam 74. This counterclockwise pivot action of pawl 50 also moves locking pins 58, 60 out of locking channel 68, 70 and into an adjacent relationship with an annular groove in the latch shaft. This movement releases the latch shaft for rotation when latch handle 78 is turned. As handle 78 is turned, cam bolt portion 34 moves through the strike opening 32 and, due to the cam, snugs up and locks the door with respect to the tub. At the same time, cam portion 82 pushes against switch actuator 84 to condition the timer 16 for controlling a dishwashing cycle.

It should be understood that spring 53 may be eliminated within the purview of this invention by weighting the lower end of pawl 50 sufficiently to pivot the pawl clockwise when the door is open.

While the embodiment of the present invention as herein disclosed constitutes a preferred form, it is to be understood that other forms might be adopted.

What is claimed is:

l. A combination latch and switch actuating mecha nism for a dishwasher having a tub and a door hingedly mounted with respect to said tub for closing an access opening in the tub, said mechanism comprising an actuator plate adapted to be affixed to said tub adjacent said access opening and a latching assembly adapted to be affixed to said door, said actuator plate having a tongue and a strike, said latching assembly having a latch shaft rotatably mounted with respect to said door, a latch handle affixed on one end of said shaft outside said door for rotating said shaft, a latch cam affixed on the other end of said shaft for rotation with said shaft, and a pawl mounted for pivoting about an intermediate pivot point thereof with respect to said shaft and said door and having a switch actuator mounted thereon on one side of said pivot point adjacent said latch cam and normally pivotally spaced sufficiently therefrom when said door is open to prevent actuation thereof, said pawl on the other side of said pivot point adapted to engage the tongue of said actuator plate when said door is closed thereby to pivot said pawl about said pivot point in one direction to place said switch actuator in a position sufficiently close to said latch cam to enable the actuation of said switch actuator by said latch cam when said shaft is rotated, said shaft having an annular groove and a locking channel thereon and said pawl having a lock pin thereon adjacent said shaft, said lock pin pivotally movable between a position in said groove to permit rotation of said shaft when said door is closed and a position in said locking channel to prevent rotation of said shaft when said door is open, said latch cam having a first cam portion lockingly engageable with said strike and a second cam portion actuatingly engageable with said switch actuator when said door is closed and said shaft is rotated.

2. The combination latch and switch actuating mechanism of claim 1 including a spring connected to said pawl on said one side of said pivot point tending to pivot said pawl about said pivot point in the opposite direction when said door is open.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3005065 *Dec 29, 1959Oct 17, 1961Gen ElectricDomestic appliance
US3627960 *Nov 6, 1970Dec 14, 1971Gen Motors CorpAppliance lid interlock mechanism
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3912891 *Aug 2, 1974Oct 14, 1975Gen Motors CorpDoor latch assembly with vertically moved microswitch engaged by striker
US4776620 *Feb 10, 1988Oct 11, 1988Whirlpool CorporationDoor latch for dishwasher
US5631454 *Sep 27, 1995May 20, 1997Trw Inc.Switch and instrument panel interlock latch controlled by switch actuator
US5688003 *Aug 9, 1996Nov 18, 1997The United States Of America As Represented By The United States Department Of EnergyRetaining latch for a water pit gate
US5810403 *Sep 17, 1996Sep 22, 1998General Electric CompanySnap latch assembly for a dishwasher
US5868014 *Dec 18, 1996Feb 9, 1999Samsung Electronics Co., Ltd.Security locking device for a desk top computer
US6527315 *Dec 22, 2000Mar 4, 2003Whirlpool CorporationDoor latch for a dishwasher
US6761381 *Aug 9, 2001Jul 13, 2004General Electric CompanyMethods and apparatus for securing a dishwasher door
US7089948 *May 3, 2002Aug 15, 2006Whirlpool CorporationIn-sink dishwasher with integrated latch
US7727338 *Dec 15, 2006Jun 1, 2010Bsh Bosch Und Siemens Hausgeraete GmbhDishwasher machine with door and handle element
US20030205252 *May 3, 2002Nov 6, 2003Deboer John M.In-sink dishwasher with integrated latch
US20070144566 *Dec 15, 2006Jun 28, 2007Bsh Bosch Und Siemens Hausgerate GmbhDishwasher machine with door and handle element
US20150150432 *Jun 19, 2013Jun 4, 2015BSH Bosch und Siemens Hausgeräte GmbHDomestic appliance having a locking arrangement and a door-weight-compensation system
CN104394750A *Jun 19, 2013Mar 4, 2015Bsh博世和西门子家用电器有限公司Domestic appliance having a locking arrangement and a door-weight-compensation system
Classifications
U.S. Classification292/241, 292/DIG.690, 200/61.62, 292/210
International ClassificationA47L15/42
Cooperative ClassificationA47L15/4259, Y10S292/69
European ClassificationA47L15/42J6A