US3244830A

US3244830A - Latching mechanism for front opening cabinets

Info

Publication number: US3244830A
Application number: US302804A
Authority: US
Inventors: Wayne C Bates
Original assignee: National Lock Co
Current assignee: National Lock Co
Priority date: 1963-08-19
Filing date: 1963-08-19
Publication date: 1966-04-05
Anticipated expiration: 1983-04-05

Description

April 5, 1966 w. c. BATES 3,244,830

LATOHING MECHANISM FOR FRONT OPENING OABINETS Filed Aug. 19, 1965 5 Sheets-Shea?I 1 fr lll April 5, 1966 w. c. BATES 3,244,830

LATCHING MECHANISM FOR FRONT OPENING CABINETS Filed Aug. 19, 196s s sheets-sheet a l f Y.

wayne CdL-S April 5, 1966 w. c. BATES 3,244,830

LATCHING MECHANISM FOR FRONT OPENING CABINETS Filed Aug. 19, 1963 5 Sheets-Sheet 3 f m ff A 5] 54 ff 0 forrzays United States Patent O 3,244,830 LATCHING MECHANISM FR FRONT OPENING CABINETS Wayne C. Bates, Rockford, Ill., assigner to National Lock Co., Rockford, Ill., a corporation of Delaware Filed Aug. 19, 1963, Ser. No. 302,804 6 Claims. (Cl. 20G-61.68)

The present invention relates to a novel latching mechanism and more particularly to a novel spring-biased latching means adapted to be utilized on a front-opening household appliance such as a dishwasher or similar appliance.

Among the important objects of the present invention is the provision of a latching mechanism having a springbiased latch handle which is pivotally mounted in a door of a cabinet or enclosure. The latch handle includes an upwardly extending latching projection which cooperates with a roller mounted on a strike bracket afxed to the top of the enclosure. The handle has a generally downrwardly extending portion at the exterior of the door which is grasped by the operator to unlatch the door from the cabinet.

Another important object of the present invention is the provision of a spring retainer assembly to bias the latch handle to the normal latching position. The spring retainer assembly includes an elongated spring retainer member which is pivotally mounted at one end onto the lower portion of the latching projection of the latch handle, and at its other end ythe retainer is mounted for limited longitudinal movement on a rivet. A compression spring surrounds the retainer and urges the latch handle and its latching projection tothe latched position.

A further object of the present invention is the pro- Vision of a locking arm which retains the latch handle in its unlatched position when the door is pivoted away from the cabinet. The locking arm is pivotally mounted on the latch housing mounted on the door of the appliance and spring-biased toward its locking position with a projection of the arm abutting the strike assembly with the door in a closed position and the opposite end of the -arm biased over a locking projection on the latch handle when the handle is in an unlatched position and the door is opened and removed from the strike assembly. This locking arm prevents accidental actuation of a switch in the door to initiate a cycle of operation which is adapted to be actuated by movement of the latch handle to its closed position. Thus, actuation of the switch is prevented when the door is in its open position.

The present invention further comprehends the provision of a switch arm piVo-tally mounted in the latch housing Ito provide for automatic initiation of an operating cycle when the door is closed and latched. The switch arm is spring-biased and has one endresting on a portion of th-e latch handle which is raised to latch the door. The opposite end of the arm re-sts on the actuating button or plunger of a switch mounted on the latch housing so that latching the door by moving the latch handle will act to depress the switch button through pivotal movement of the switch arm.

Further objects are to provide a construction of maximum simplicity, efficiency, economy and ease of assembly and operation, and such further objects, advantages and capabilities as will later more fully appear and are inherently possessed thereby.

In the drawings:

FIGURE l is a front elevational view of a cabinet or enclosure and door for a front loading automatic dishwasher and sho-ws the latch handle of a latching mechanism therefor.

FIG. 2 is a vertical-cross sectional View taken on the 3,244,830 Patented Apr. 5, 1966 lCC line 2-2 of FIG. 1 looking in the direction of the arrows.

FIG. 3 is a vertical cross sectional view taken on the line 3-3 of FIG. 1.

FIG. 4 is a vertical cross sectional view similar to FIG. 3 but with `the latching mechanism in a substantially unlatched position.

FIG. 5 is a top plan view of the latching mechanism with the lid of the enclosure removed.

FIG. 6 is a vertical cross sectional view taken on the line 6 6 of FIG. 7 showing the latch housing.

FIG. 7 is a top plan view of the latching housing assembly.

FIG. 8 is an end elevational View of the latch housing assembly.

FIG. 9 is an end elevational view of the latch housing.

FIG. 10 is a rear elevational View of the latch housing assembly.

FIG. ll is a side evelation View of the latch handle.

FIG. l2 is a top plan View of the strike member.

FIG. 13 is a side elevational View of the strike member.

FIG. 14 is a top plan View of the switch arm.

FIG. l5 is a top plan View of the locking arm.

Referring to the disclosure in the drawings wherein is shown an illustrative embodiment of the present invention, FIG. l discloses a cabinet or enclosure 10' for an automatic dishwasher or the like which may be installed in the cabinetry of a kitchen o-r may be a portable type having a hinged front door 11 to provide a front loading appliance. The door is hinged adjacent the base of the cabinet, and the hinges may include a springloaded structure to retain the door in a fully open position. The latching mechanism 12 is mounted within the door 11 adjacent the top thereof with only the latch handle 13 bein-g exposed to view.

As more clearly seen in FIGS. 2, 3 and 6 to 1G, inclusive, the latching mechanism l2 includes a latch housing 14 mounted within the door 11 and carrying the latch handle 13, and a strike assembly 15 which is mounted on the top of the cabinet lil and engaged 'by the latch handle to latch the door in a fully closed position. The top of the door 1l. includes an overlapping downwardly extending lip 1d which is cut away at 17 to allow for movement of the latch handle to unlatch the door 11. The handle includes a substantially rectangular portion 18 having an opening 13 therethrough so that the hand of the operator can easily grasp and operate the handle. The portion 1S is normally substantially vertically disposed (FIG. 3) and merges into a substantially horizontal and inturned portion 21 having spaced depending ears or tabs 22 for pivotally mounting the handle onto the latch housing '14 with an elongated rivet or transverse pin 23.

The horizontal portion 21 terminates in a centrally located latching portion 24 (FIGS. 4 and 1l) which extends rearwardly and upwardly in a hook-like projection 25 having a rounded undercut area 26 adapted to engage the strike assembly l5. A triangular locking projection 27 is formed on the horizontal portion 21 and offset from the latching portion 24 and cooperates with a locking arm to be later described. A bifurcated portion 28 depends from the inner end of the latching portion 24 and has aligned Aopenings for a transverse pin or rivet 29 extending therethrough to mount a spring retainer 31 thereon. The retainer has an enlarged head 32 fitting within the bifurcated portion 28 and having an opening receiving the rivet 29 and an elongated body 34 having a slightly elongated opening 35 adjacent the opposite end adapted to receive a retainer rivet or pin 35 mounted in the latch housing 14. A compression spring 37 has one end bearing against the enlarged head 32 on the retainer 31 and the opposite end bearing against the retainer rivet 36.

The strike assembly (see FIGS. 12 and 13) includes a plate 38 having a stepped portion 39 intermediate the ends thereof and spaced downturned sides or edges 41. A pair of transversely spaced and longitudinally extending elongated openings 42 are located adjacent one end of the plate for suitable securing means such as the mounting screws 43 aiixing the strike to the top of the cabinet lil. Adjacent the opposite end of the plate, and on the other side of the stepped portion 39, is a laterally extending elongated opening 44 adapted to receive the upper end of the hook-like projection Z5. The downturned edges 41 are enlarged at 4S adjacent the opening 44 and have aligned openings for a strike rivet or pin 46 extending therethrough. A strike roller 47 is mounted on the rivet or pin 46 and is adapted to be engaged by the undercut portion 26 of the hookelike projection 2S.

The latch handle 13 is pivotally mounted on the elongated pin or rivet 23 supported in the latch housing 14 (FIGS. 6 toy 10, inclusive). The housing includes an elongated top wall 48 with downwardly extending

end walls

49, 49 and a downwardly extending rear wall 51. Approximately halfway down the rear wall 51 and deiining the lower boundary of a central opening therein is a centrally located rearwardly projecting extension 52 terminating in a pair of spaced parallel downwardly extending ears 53. The

end walls

49, 49 each have a forwardly and upwardly extending supporting ear 54 having opening 55 adapted to receive the elongated rivet or pin 23.

The top wall 43 includes openings 56 for suitable securing means, such as screws, to affix the housing to the top edge 57 of the door 11. At one end of the rear wall 51 is located a depending laterally extending flange 58 having spaced openings 59 for suitable securing means 61 to mount a switch 62 on the iiange 58. The switch has a button or plunger 63 projecting from the top thereof adapted to be actuated by a switch arm `64 mounted on a vertical tab 65 formed on the rear wall 51 out extending orward from the wall. The switch 62 is suitably connected into the operating circuit of the dishwasher in a manner to be later described.

The switch arm 64 includes a laterally extending horizontal arm 66 adapted to contact the switch button 63 and an upper horizontal arm 67 adapted to engage the upper horizontal surface of the latch handle v13. The arms are connected by an angularly positioned plate having upwardly and rearwardly extending ears 68 which include openings for a pivot pin 69 to mount the switch arm on the liange 65. A helical spring 71 has extended ends engaging the rear wall 51 and the top surface of the arm 66 to yieldably urge the switch arm in a counterclockwise direction as seen in FIG. 8.

A horizontal tab 72 extending forwardly of the Irear wall 51 adjacent the opposite end of the latch housing 14 mounts a locking arm 73 for pivotal movement on a vertical pivot pin 74. The locking arm 73 includes a central base 7 5 with perpendicular ears 7 6 having openings to receive the pivot pin 74. A forwardly and downwardly extending arm portion 77 is angularly positioned relative to the base 75 and an arm portion 7S on the opposite side of the base 75 is slightly `offset therefrom. A helical spring 79 surrounds the pivot pin 74 and has extended ends which bear against the rear wall 51 and the outer surface of the arm portion 77 to yieldably bias the locking arm 73 in a counterclockwise direction as seen in FIG. 7.

Now considering `operation of the latching mechanism for an automatic dishwasher or the like, FIGS. 2 and 3 show the latch mechanism with the door 11 closed and latched on the cabinet 1t). To unlatch the door, the handle 13 is pulled outward and pivots around the pin or rivet 23 to withdraw the latching portion 24 of the handle 13 downwardly and out of the opening 44 in the strike plate 38 (FIG. 4). Movement of the handle is made against the force of the compression spring 37 which urges the handle to its latching position. Once the hook-like projection 25 clears the strike roller 47, the door 1'1 can be opened outwardly and downwardly to a horizontal position.

As the door is opened, the arm portion 78 no longer abuts the strike plate 3S and the spring 79 urges the locking arm 73 in .a counterclockwise direction around the pin 74 until the arm 7 8 engages the rear wall 51 of the latch housing 14. The downwardly extending arm 77 is rotated to a position over the triangular projection Z7 on the handle 13 where the arm engages the forward surface of the projection when the handle has been actuated to lock said handle in said actuated position. Also, with the handle pivoted from its normal latching position the switch arm 64 is also allowed to rotate under action by the spring 71 to allow the switch button 63 to rise and open the switch contacts. The locking arm 73 holding the handle in its unlatched position thus prevents a reactivation of the switch 62 when the door 111 is open for unloading or loading of the cabinet 10.

When the cabinet has been loaded, the door is moved to closed position and the arm portion 73 is engaged by the strike plate 38 to rotate the locking arm 73 in a clockwise position to release the handle 13. The compression spring 37 urges the handle to its latched position, and the horizontal portion 21 of the handle contacts the arm 66 to rotate the switch arm 64 in a clockwise position so that the arm 65 depresses the switch button 63 to close the switch contacts. The switch 62 is in a circuit which when the switch is closed, initiates the timed operating cycle of the dishwasher, and when the rinse cycle is concluded the timer in the circuit shuts ofi the circuit and resets the timer even though the contacts of the switch 62 remain closed.

While this invention has been shown and described asV being yadvantageously applicable to an automatic dishwasher, it is not my desire or intent to unnecessarily limit the scope or the utility of the invention by virtue of this illustrative embodiment.

Having disclosed the invention, I- claim:

1. A latching mechanism for .a front opening door of. a cabinet such as a dishwasher or the like, comprising a latch housing mounted in the door of the cabinet, a latchmember pivotally mounted inV the latch housing and including a handle and a latching portion having an up-v wardly extending latching projection, a strike member mounted in the cabinet above the latch housing andy adapted to be engaged by the latching projection to latch the door in closed position, a spring retainer pivotally mounted at one end to the latching portion of the latch member and mounted for limitedV longitudinal movement at the opposite end on the latch housing, resilient means urging the spring retainer and latch member toward the latching position, and means to lock the' latch member in unlatched position when the door is opened.

2. A latching mechanism for `a front opening door on a cabinet such as an automatic dishwasher or the like, comprising a latch housing mounted in the: door of the cabi* net and carrying an elongated pin, a latch member pivotally mounted on said pin yand' including a handle portion and. a generallyhorizontal latching portion, a latching projection extending upwardly from said latching portion and having an undercut surface thereon, a strike member affixed to the cabinet `and having an opening accommo-V dating the latching projection, a strike roller mounted on the strike member and adapted to cooperate with the undercut surface on the latching projection, a spring retainer having an enlarged head at one end pivotallyl mounted on said latching portion and mounted at' its opposite end for pivotal and limited` longitudinal movement on said latch housing, a compression spring with one end abutting the enlarged head of the spring retainer and the opposite end abutting the latch housing toL yieldably urge the latch member to its latched position, and means to lock the latch member in its unlatched position when the door is opened.

3. A latching mechanism as set forth in claim 2, yin which said locking means includes a locking arm yieldably biased to a locking position and a locking projection on the upper surface of the latching portion of the latching member cooperating with the locking arm.

4. A latching mechanism as set forth in claim 3, in which said locking arm has a central portion pivotally mounted on the latch housing and one end portion abutting the strike member when the door is in closed position, the other end extending outwardly and downwardly, and means to bias the locking arm to locking engagement with the rlocking projection when the latch housing is moved away from the strike member.

5. A latching mechanism as set forth in claim 2, including a switch mounted on the latch housing and a switch arm pivotally mounted on the latch housing and having one end contacting a button projecting upwardly from the switch to open or close the switch and the opposite end contacting the upper surf-ace of the latching portion of said latch member.

6. A latching mechanism as set forth in claim 5, in which the switch arm is yieldably biased to contact said latching portion and when the latch member is pivoted to its unlatched position the switch arm pivots to open the switch contacts.

References Cited by the Examiner UNITED STATES PATENTS 1,269,467 6/ 1918 Leonard et al. 292-216 2,05 4,907 3/ 1936 Mollet 292-99 X 2,618,282 11/ 1952 Stanitz et al. 200-61 2,767,007 10/ 1956 Burke 292--216 2,777,721 1/1959 Burke et al. 292-216 BERNARD A. GILHEANY, Primary Examiner.

Claims

1. A LATCHING MECHANISM FOR A FRONT OPENING DOOR OF A CABINET SUCH AS A DISHWASHER OR THE LIKE, COMPRISING A LATCH HOUSING MOUNTED IN THE DOOR OF THE CABINET, A LATCH MEMBER PIVOTALLY MOUNTED IN THE LATCH HOUSING AND INCLUDING A HANDLE AND A LATCHING PORTION HAVING AN UPWARDLY EXTENDING LATCHING PROJECTION, A STRIKE MEMBER MOUNTED IN THE CABINET ABOVE THE LATCH HOUSING AND ADAPTED TO BE ENGAGED BY THE LATCHING PROJECTION TO LATCH THE DOOR IN CLOSED POSITION, A SPRING RETAINER PIVOTALLY