Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3921252 A
Publication typeGrant
Publication dateNov 25, 1975
Filing dateApr 29, 1974
Priority dateApr 29, 1974
Publication numberUS 3921252 A, US 3921252A, US-A-3921252, US3921252 A, US3921252A
InventorsLauren W Guth
Original AssigneeGen Electric
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Hinge assembly for a dishwasher door
US 3921252 A
Abstract
An improved hinge assembly for a dishwasher door, wherein a hinge arm of the hinge assembly includes a selector element pivotally attached to its lower end, the selector element being biased by a spring in such a manner that when the door is unlatched the spring causes the selector element to pivot thereby forcing a cam surface against a cam pad to effect opening of the door a preselected distance and thereby promoting natural drying of dishes inside the dishwasher.
Images(2)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

United States Patent [191 Guth [' Nov. 25, 1975 HINGE ASSEMBLY FOR A DISHWASHER DOOR [75] Inventor: Lauren W. Guth, Louisville, Ky.

[73] Assignee: General Electric Company,

Louisville, Ky.

[22] Filed: Apr. 29, 1974 [21] Appl. No.: 464,894

[52] US. Cl 16/142; 126/191 [51] Int. Cl. E05D 11/08; F23M 7/00 [58] Field of Search ..l6/1,180,139,140,141,

Primary Examiner-Patrick D. Lawson [57] ABSTRACT An improved hinge assembly for a dishwasher door, wherein a hinge arm of the hinge assembly includes a selector element pivotally attached to its lower end, the selector element being biased by a spring in such a manner that when the door is unlatched the spring causes the selector element to pivot thereby forcing a cam surface against a cam pad to effect opening of the door a preselected distance and thereby promoting natural drying of dishes inside the dishwasher.

4 Claims, 3 Drawing Figures [56] References Cited UNITED STATES PATENTS 2,264,059 11/1941 Weimer et a1, 126/191 US. Patent Nov. 25, 1975 Sheetlof2 3,921,252

FIGZI US. Patent Nov. 25, 1975 Sheet 2 of2 3,921,252

HINGE ASSEMBLY FOR A DISHWASHER DOOR BACKGROUND OF THE INVENTION In the use of a dishwasher, it is desirable to provide a door-hinge assembly, such as shown for example in US. Pat. No. 2,727,507-Titus, whereby the door can be moved between closed, partially open, and fully open positions and releasably maintained at said positions. Various apparatus have been constructed to provide such a door assembly. However, it is desirable to provide a door-hinge assembly which has improved smoothness of operation during movement of the door between the partially open and the closed position and which is of simple construction.

The apparatus of this invention provides these desired operational features and, moreover, reduces the impact forces exerted on the door and reduces the noise of operation.

SUMMARY OF THE INVENTION In accordance with this invention, a dishwasher has a door pivotally movable between a closed position and a fully: open position. -A hinge arm having first and second end portions is connected to the door at its first end portion and extends outwardly therefrom. A selector element having first and second end portions and first and second side portions ispivotally attached to the second end portion of the hinge arm. The selector element includes a cam surface on the first side portion and a stop element on the second side portion. A cam pad is connected to the appliance at a location in juxtaposition to the location of the cam surface, when the door is in its closed position. A spring is associated with the selector element so that upon unlatching of the door the selector element is caused to pivot, thereby bringing the cam surface into frictional contact with the cam pad, thus exerting an opening force on the door through the hinge arm. The stop element on the second side portion of the selector element restricts the pivotal movement thereof so that the door is only opened a preselected amount. The stop element also insures that the cam surface does not pivot to an overcenter position with respect to the pivot point on the hinge arm and thus prevent the door from being closed. By preventing the cam surface from pivoting to an over-center position, it is possible to reload the spring for subsequent opening of the door by simply closing the dishwasher door and causing the cam surface to pivot the selector element in the opposite direction against the bias of the spring.

More specifically, the invention includes: in a dishwasher having a latchable door pivotally movable between a closed position and a fully open position; a hinge arm having first and second end portions and being connected at the first end portion to the door and extending outwardly therefrom; and a spring associated with the hinge arm for exerting forces on the door through said hinge arm, the improvement comprising: a cam pad connected to the appliance at a location adjacent the second end portion of the hinge arm in the closed position of the door; and a selector element having first and second end portions, first and' second side portions, a cam surface on the first side portion and a stop element on the second side portion, said selector element being connected at the first end portion to the spring and pivotally connected at the second end portion to the second end portion of the hinge arm, said selector element being of dimensions sufficient for contacting the cam pad with the cam surface and exerting an opening force on the door against a biasing force of the spring in the closed position of the door; whereupon unlatching of the door allows said selector element to pivot to the extent permitted by the stop element, thereby exerting an opening force on the door through the hinge arm to open the door a preselected distance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagrammatic, partially sectioned view of a portion of a dishwasher showing the hinge assembly of this invention and the door in a closed position;

FIG. 2 is a diagrammatic, partially sectioned view of a portion of a dishwasher showing the hinge assembly of this invention and the door in a partially open position; and

FIG. 3 is a diagrammatic, partially sectioned view of a portion of a dishwasher showing the hinge assembly and the door in a fully open position.

DETAILED DESCRIPTION OF THE INVENTION In the embodiment of FIG. 1, a dishwasher 10 has a door 12 that is pivotally connected to a wall of the dishwasher 10 for movement between a closed position (FIG. 1) and a fully open position (FIG. 3).

A hinge arm 14 has first and second end portions I6, 18 and is connected at the first end portion 16 behind an inner surface 20 of the door 12 and extends outwardly therefrom.

A selector element 22 has first and second end portions 24, 26 and first and second side portions 28, 30. A cam surface 32 is on the first side portion 28 of the selector element 22 and a stop element 34 is on the second side portion 30 of the selector element 22. The selector element 22 is connected at the first end portion 24 to a biasing means 36, such as a helical spring, and is pivotally connected at the second end portion 26- to the second end portion 18 of the hinge arm 14.

A cam pad 38 is connected to the dishwasher 10 at a location adjacent the position of'second end portion 18 of the hinge arm 14 when the door 12 is in its closed position.

The selector element 22 is of dimensions sufficient for contacting the cam pad 38 with the cam surface 32 and exerting a tensile force on the biasing means 36 as the door is being closed.

In FIG. 2, the selector element 22 is shown to be of sufficient dimensions such that the cam pad 38 frictionally engages the cam surface 32. Upon unlatching of the door, selector element 22 pivots, due to the bias of spring 36, until the stop element 34 contacts the end portion 18 of the hinge arm 14.

In FIG. 3, the selector element 22 is shown to be of dimensions sufficient for being disengaged from the cam pad when the door 12 is moved between the partially open and fully open positions.

The biasing means 36 acts as a normal door restraining spring when the door is between its partially open and open positions. It performs the further function of a door opening spring when the door is between its closed and partially open positions. In this regard, it should be noted that there is less tensile force on the biasing means 36 when the door is in the partially open position, relative to the tensile force exerted on the biasing means 36 when the door is closed. This differential in tensile force is brought about by providing that when the door is closed selector element 22 pivots in the opposite direction to increase the tensile force on the spring and thus enable it to perform the additional function of being a door opening means.

As can be appreciated, the size and weight of the door 12 and the size and dimensions of the hinge arm 14 will determine the dimensions of the selector element 22 and biasing means 36 needed for providing the above-described operation.

It should be noted that when the door is unlatched and the cam surface 32 pivots in frictional contact with the cam pad 38, the frictional contact of the cam surface 32 with the cam pad 38 exerts a smooth uniform force on the selector element which eliminates much of the noise of operation and increases the smoothness of operation. Also, the rate at which the door opens is controlled by frictional forces exerted on the cam surface 32 and abrupt stopping of the opening operation is avoided with less door impact and rebound.

Other modifications and alterations of this invention will become apparent to those skilled in the art from the foregoing discussion, and it should be understood that this invention is not to be unduly limited thereto.

What is claimed is:

1. In a dishwasher having a latchable door pivotally movable between a closed position and a fully open position, a hinge arm having first and second end portions and being connected at the first end portion to the door and extending outwardly therefrom, and a spring associated with the hinge arm for exerting forces on the door through said hinge arm, the improvement comprising:

a cam pad connected to the appliance at a location adjacent the second end portion of the hinge arm in the closed position of the door; and

a selector element having first and second end portions, first and second side portions, a cam surface on the first side portion and a stop element on the second side portion, said selector element being connected at the first end portion to the spring and pivotally connected at the second end portion to the second end portion of the hinge arm, said selector element being of dimensions sufficient for contacting the cam pad with the cam surface and exerting an opening force through the hinge arm on the door, the opening force resulting from a biasing force of the spring in the closed position of the door, whereupon unlatching of the door allows said selector element to pivot until the stop element contacts the second end portion of the hinge arm, thereby opening the door a preselected distance.

2. Apparatus, as set forth in claim 1, wherein the selector element is of a dimension such that less force is exerted thereon by the spring when the door is in the partially open position relative to the force exerted thereon by the spring when the door is in the closed position.

3. Apparatus, as set forth in claim 1, wherein the selector element is of dimensions sufficient for continuously contacting the cam pad with the cam surface during movement of the door between the closed position and the partially open position of the door.

4. Apparatus, as set forth in claim 1, wherein the selector element is moved from contact with said cam pad when the door is moved between its partially open position and its fully open position and said spring acts on said hinge arm through said selector element to function as a normal restraining spring.

l l l

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2264059 *Dec 12, 1938Nov 25, 1941Newark Stove CompanyOven construction
US2425365 *Nov 13, 1945Aug 12, 1947Aviat CorpCounterbalanced door structure
US2727507 *Nov 25, 1953Dec 20, 1955Magic Chef IncOven doors and the like
US2800128 *Jan 25, 1954Jul 23, 1957Sears Roebuck & CoHinge for oven door
US3450125 *May 24, 1966Jun 17, 1969Kelvinator IncCounterbalanced hinge for oven doors
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4495674 *Mar 5, 1982Jan 29, 1985Clark Equipment CompanyConcealed door hinge having a double pivotal mounting
US5235725 *Dec 19, 1991Aug 17, 1993Itt CorporationClosure panel hinge
US5758676 *Aug 6, 1996Jun 2, 1998White Consolidated Industries, Inc.Support-door hinge
US6679572 *Feb 14, 2001Jan 20, 2004Maytag CorporationLid or door for household appliances
US6938444 *Aug 15, 2002Sep 6, 2005Lg Electronics Inc.Device for linking door to case in drum type washing machine and method for assembling the same
US6945614 *Jun 12, 2002Sep 20, 2005Maytag CorporationDishwasher door hinge positioning means and method
US7934783Jul 16, 2008May 3, 2011Electrolux Home Products, Inc.Counterbalance assembly for a dishwasher door and associated method
US8042891Nov 23, 2010Oct 25, 2011Electrolux Home Products, Inc.Counterbalance assembly for a dishwasher door and associated method
US8043442Nov 24, 2006Oct 25, 2011Electrolux Home Products, Inc.Counterbalance devices for a closure
US8231738May 21, 2008Jul 31, 2012Electrolux Home Products, Inc.Dishwasher tub having integral hinge support member, and dishwasher incorporating same
US20030172692 *Aug 15, 2002Sep 18, 2003Lg Electronics Inc.Device for linking door to case in drum type washing machine and method for assembling the same
US20070285905 *Jun 7, 2006Dec 13, 2007Toppoly Optoelectronics Corp.Electronic device, display apparatus, flexible circuit board and fabrication method thereof
US20080122331 *Nov 24, 2006May 29, 2008Electrolux Home Products, Inc.Counterbalance devices
US20090007944 *May 21, 2008Jan 8, 2009Electrolux Home Products, Inc.Dishwasher Tub Having Integral Hinge Support Member, and Dishwasher Incorporating Same
US20090072686 *Jul 16, 2008Mar 19, 2009Electrolux Home Products, Inc.Counterbalance assembly for a dishwasher door and associated method
US20100127606 *Nov 25, 2009May 27, 2010Mansfield Assemblies Co.Slow open slow close appliance hinge assembly
US20110062840 *Nov 23, 2010Mar 17, 2011Electrolux Home Products, IncCounterbalance assembly for a dishwasher door and associated method
US20150150432 *Jun 19, 2013Jun 4, 2015BSH Bosch und Siemens Hausgeräte GmbHDomestic appliance having a locking arrangement and a door-weight-compensation system
EP0014114A1 *Jan 11, 1980Aug 6, 1980Esswein S.A.Swinging door for a household apparatus, which is permanently returned to a halfopened position
WO2009153186A1Jun 8, 2009Dec 23, 2009BSH Bosch und Siemens Hausgeräte GmbHHousehold appliance with device for door weight compensation
Classifications
U.S. Classification16/281, 126/191, 16/286
International ClassificationA47L15/42, E05F1/10
Cooperative ClassificationE05Y2900/304, E05Y2201/416, A47L15/4261, E05F1/1075
European ClassificationA47L15/42J6B, E05F1/10D4B