US3419192A

US3419192A - Treating agent dispenser for automatic washing machine

Info

Publication number: US3419192A
Application number: US645214A
Authority: US
Inventors: Jerry O Wrightenberry
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1967-06-12
Filing date: 1967-06-12
Publication date: 1968-12-31
Anticipated expiration: 1985-12-31

Description

1968 J. o. WRIGHTENBERRY 3,419,192

TREATING AGENT DISPENSER FOR AUTOMATIC WASHING MACHINE Filed June 12. 1967 Sheet F'lGA HTENBEERY:

1968 J. o. WRIGHTENBERRY 3, 9,

TREATING AGENT DISPENSER FOR AUTOMATIC WASHING MACHINE Filed June 12, 1967 Sheet 2 of 5 Fi G.A

TERRY O. WRIGHTENBERRY \-us ATTORNEY 1968 J. o. WRIGHTENBERRY 3,419,192

TREATING AGENT DISPENSER FOR AUTOMATIC WASHING MACHINE Sheet 3 of Filed June 12, '1967 INVENTOR. JERRY O.WR\GHTE'NBERRY BY fi H 15 ATTORNEY 3,419,192 TREATING AGENT DISPENSER FOR AUTOMATIC WASHING MACHINE Jerry O. Wrightenberry, Jetfersontown, Ky., assignor to General Electric Company, a corporation of New York Filed June 12, 1967, Ser. No. 645,214 10 Claims. (Cl. 222-166) ABSTRACT OF THE DISCLOSURE A mechanism for tightly closing and positively opening a treating agent dispensing device of the type including a cup pivoted in a side-opening housing on the inner face of a wash chamber door of an automatic washing machine by a door-journaled shaft. The mechanism includes a cup shaft-attached cam having a lead surface intersecting and declining from a lobe surface, and a camfollowin-g latching lever pivoted on the door on an axle spaced from the cup shaft. The lever is interconnected to the cam by a tension spring and has a cam follower which is slidable along both the cam surfaces. When the follower is slidably engaged with the cam lead surface it is yieldably urged therealong by the spring to rotate the cup to a closed position substantially totally inside the housing. Unless the follower is slidably engaged with the cam lead surface, the spring yieldably urges the cup to rotate to an open position substantially wholly outside the housing.

BACKGROUND OF THE INVENTION This invention relates generally to automatic washing machines and more particularly to an improved treating agent dispensing means for an automatic washing machine.

Although not limited in its usefulness thereto, the present invention is particularly adapted for use in an automatic dishwasher.

In an automatic dishwasher, it is desirable to provide one or more pre-rinses with hot water to warm the dishes and remove gross food soil. The pre-rinses are followed by a wash operation in which detergent is added to the water.

The detergent is conventionally automatically dispensed at the commencement of the washing cycle from a treating agent dispensing means of the type including a cup pivoted in a side-opening housing on the inner face of a bottom-hinged wash chamber door by a door-journaled shaft for movement between a closed position within the housing to an open position outside the housing.

Prior to the pre-rinses, the door is in a horizontal open position to permit loading of the soiled dishes. Before closing the door, the cup is opened, manually filled with detergent and rotated to its closed position where it is held by various conventional releasable latch means.

Then, the door is closed and the dishwasher sequence control means is actuated to start the pre-rinsing. The sequence control means actuates conventional trip means to release the latch means at the commencement of the washing cycle and the cup pivots to its open position dispensing the detergent to the Wash chamber.

It is desirable that the cup be firmly held in its closed position during the pre-rinses to avoid entry of water into it. However, undesirable water entry has presented a problem in the past, because of the partial re-opening of the cup closed by previously-known latching means or closing mechanisms, frequently causing a granular detergent to cake and fail to dispense properly from the cup during the washing cycle.

" nited States Patent SUMMARY OF THE INVENTION Invention objects It is therefore a primary object of the present invention to provide an improved automatic washing machine treating agent dispenser of the type including a cup relatively movable between an open position outside a hous ing and a closed position within the housing.

It is another object of the present invention to provide an overtravel mechanism for tightly closing such a dispenser.

It is yet another object of the present invention to provide a mechanism for tightly closing and positively opening such a dispenser which employs a single yieldable member to urge both the closing and opening.

Statement of the invention All of the foregoing objects are substantially achieved by the presently preferred embodiment of the present invention. This presently preferred embodiment, described simply comprises: (A) a cam (I) mounted on the cup shaft for rotation therewith, and (2) having (a) a lobe surface and (b) a lead or control surface intersecting and declining from said lobe surface; (B) a latching lever (1) pivoted on an axle spaced from said cup shaft, and (2) having a cam follower slidable along said cam surfaces; and (C) a single tension spring connected between said cam and lever in such a manner that 1) unless said follower is slidably engaged with said cam lead surface, said spring yieldably urges the cup to pivot to an open position substantially wholly outside the housing, and (2) when said follower is slidably engaged with said cam lead surface, said spring yieldably urges said follower to slide therealong to rotate the cup to a closed position substantially totally within the housing.

BRIEF DESCRIPTION OF THE DRAWING The present invention is illustrated in the accompanying drawing wherein:

FIGURE 1 is a fragmentary sectional view of a door for an automatic diswasher having mounted thereon the dispenser of the present invention;

FIGURES 2-4 are fragmentary views along the left or inner .face of the door of FIGURE 1, showing various pivotal positions of the dispenser cup and showing in shadow the respective conditions of the mechanism for tightly closing annd positively opening the cup;

FIGURES 2A-4A are partly broken fragmentary views taken substantially along line AA of FIGURE 1, showing in detail the mechanism shown in shadow in FIG- URES 2-4 respectively;

FIGURES 5-7 are views corresponding to FIGURES 2-4, respectively, of a modification of the dispenser of the present invention;

FIGURES 5A-7A are views similar to FIGURES 2A4A of the modified mechanism shown in shadow in FIGURES 5-7, respectively;

FIGURE 8 is a diagrammatic view corresponding to FIGURE 2A; and

FIGURE 9 is a diagrammatic view corresponding to FIGURE 5A.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing, FIGURE 1 illustrates the upper portion of a dishwasher door 10 which is designed to be bottom hinged to a dishwasher cabinet (not shown) for pivotal movement between a generally vertical closed position and a generally horizontal open posi 3 tion. Such dishwasher doors are conventional and one of such doors is described in detail in US. Patent No. 3,125,- 249, issued Mar. 17, 1964 to Norman L. Kendt, and assigned to the General Eelectric Company, assignee of the present invention.

The door '10 has an outer wall 11 and an inner wall 12 defining therebetween a chamber 13. The inner wall 12, which faces the Wash chamber of the dishwasher when the door is in its closed position, has a portion 14 (:0- operating with an intermediate wall 15 to form a second chamber 16. The

walls

11, 12 and 15 may be suitably interconnected by such means as welding to provide a unitary structure.

The second chamber 16 contains a conventional sequence control means 17 which sequentially energizes and tie-energizes the various electrical components of the dishwasher. The sequence control means 17 includes a synchronous electric motor 18 which rotates a shaft 19 through a clutch (not shown). The motor-powered shaft 19 carries a trip cam 20. A manually operable knob 21 is secured to the shaft 19 and protrudes through an aperture in the door outer wall 11, whereby the operator of the dishwasher may rotate the knob 21 to adjust the sequence control means 17 to initiate operation of the dishwater or modify the operating cycle thereof.

With the exception of the specific configuration and function of the trip cam 20, which is to be discussed in greater detail hereinafter, the foregoing elements 10-21 are substantially conventional in nature. That is, many automatic dishwashers are provided with a sequence control means and a manually-operable knob interconnected to the sequence control means. Because of this, the foregoing elements 10-21, with the exception of the trip cam 20, may be modified considerably without departing from the spirit of the present invention. These elements 10-21 have been described in some detail, however, inasmuch as such description will contribute to a clear understanding of the structure and operation of the present invention.

In an automatic dishwasher of the type just described, a complete cycle of operation conventionally includes an initial charge of water to the wash chamber, which is closed by the door 10, followed by energization of a water and pump assembly (not shown) whereby the water is moved about within the wash chamber to effectuate a pre-rinse. After a predetermined interval, the motor and pump assembly drains the water from the wash chamber thus completing the first pre-rinse. The first pre-rinse may be followed by a second pro-rinse identical to the first. This is followed by a wash operation which is substantially identical to the pre-rinse operations except that it is of longer duration and includes the admission of detel-gent to the water. The wash operation is followed by one or more post-rinses which are identical to the above-described pre-rinses. Following the final post-rinse an electrical resistance heating element (not shown) is energized and the articles within the wash chamber are dried by evaporation.

The present invention is particularly concerned with means to dispense the detergent into the Wash chamber at the appropriate time during the afore-described cycle of operation. In accordance with the present invention, an improved dispensing means, shown generally at 22, is provided to automatically dispense a granular treating agent such as a dishwasher detergent into the wash chamber.

The dispensing means 22 includes a hollow housing member or housing 23 carried on the inner or wash chamber face of the inner wall '12 of the door 10. The housing 23 has a compartment 24 and an opening 25 through one of its sides into said compartment 24. The housing compartment 24 is adapted to receive a cup-like member or cup 26 through the side opening 25. The cup 26 is secured to a short shaft 27 to rotate therewith. The short or cup shaft 27 has its inner end journaled in the housing 23 adjacent one end of the opening 25 and its outer end journaled in and projecting through a bearing 28 mounted in the door intermediate wall 15.

As best shown in FIGURES 1 and 4, the housing 23 is preferably positioned on the door inner wall 12 so that, when the door 10 is in its closed position, the upper edge of the housing 23 is immediately below the sequence control-housing portion 14 and the short or cupshaft 27 is substantially in a common vertical plane with the motor-powered shaft 19.

With this arrangement, the cup 26 is hinged in the housing 23 by the cup-shaft 27 for pivotal movement through the housing side opening 25 between a fully open position substantially wholly outside the compartment 24 (FIGURE 4) and a closed position substantially totally within the compartment 24- (FIGURE 3).

The cup 26 is adapted to receive and contain, and subsequently dispense a granular treating agent, such as a dishwasher detergent. Since the housing 23 is carried by the inner face of the door .10, the cup 26 faces upwardly when the door 10 is in its substantially horizontal open position, as it will be when loading soiled articles into the wash chamber prior to commencement of the dishwasher operating cycle. At this time, it is desirable that the cup 26 be in its fully open position both to alert the operator to fill it with detergent and to facilitate such filling.

After filling it with detergent, the cup 26 can be manually or otherwise pivoted into the housing compartment 24, the door 10 closed, and the sequence control means 17 actuated to commence the pre-rinsing. During the prerinsing, it is highly desirable that water be prevented from entering the cup 26 and caking the granular detergent which it contains. A bafile 29 is provided on the outer side of the cup 26 which is intended to fit tightly about the perimeter of the opening 25 into the housing compartment 24 to guard against water entry into the housed cup 26 and means are required for holding the cup tightly within the housing compartment 24 during the pre-rinsing.

At the completion of the pre-rinses, means are required which can be automatically actuated by the sequence control means 17 to return the cup 26 to its fully open position at the commencement of the wash chamber to dispense the detergent into the Wash chamber.

In accordance with the present invention, a mechanism, generally designated 30, shown in shadow in FIGURES 2-4, and illustrated in detail in FIGURES 2A-4A, is provided which: (1) provides the required means for holding the cup 26 tightly within the housing compartment 24 during the pre-rinsing; (2) provides the required means which can be actuated by the sequence control means 17 to return the cup 26 to its fully open position at the commencement of the wash cycle; and (3) retains the cup 26 in its fully open position until the door is re-opened.

The mechanism 30, illustrated in detail in FIGURES 2-4 and 2A-4A, basically comprises: (a) a cam or control part 31; (b) a cam-following latching lever 32; and (c) a tension spring 33.

The cam 31 comprises a disc mounted on the protruding outer end of the cup-shaft 27 for rotation therewith. The outer periphery of the cam 31 is formed with a curved lobe surface 34 and shorter substantially fiat lead or control surface 35. The cam lobe and lead

surfaces

34 and 35 intersect one another at an intersection 36, and the cam lead surface 35 declines from the intersection 36 to a pierced ear portion 37, which protrudes from the cam outer periphery at a point opposite the intersection 36.

The cam-following latching lever 32 is bowed and substantially centrally pivoted on an axle 38. The lever axle 38 is mounted on the outer face of the intermediate wall 15 of the door 10 between the cup-shaft 27 and the motorpowered shaft 19, and is transversely spaced from the common plane of these shafts.

Assuming the door is in its closed or substantially vertical position, the bowed lever 32 can be viewed as including an upper arm 39 having an upper edge which faces the outer periphery of the trip cam and a lower arm 40 having an inner edge which faces the outer periphery of the cup-shaft cam 31.

The lower lever arm 40 is pierced adjacent its lower end, and its inner edge, which faces the cup-shaft cam 31, is formed with a cam-follower 41 having a point or apex 42.

The tension spring 33 is respectively connected at its opposite ends to the pierced ear portion 37 on the cupshaft cam 31 and the pierced lower end of the lower lever arm 40, to yieldably urge or bias the follower point 42 into slidable engagement with the outer periphery 'of the cup-shaft cam 31.

As illustrated in FIGURES 2 and 2A, the cam 31 is so mounted on the cup-shaft 27, that, as the cup-like member or cup 26 is pivoted toward its closed position, the cup-shaft cam 31, is rotated clockwise and the point or apex 42 of the latching lever cam-follower 41 can slide along the cup-shaft cam lobe surface 34 toward the intersection 36 between the lobe and lead

surfaces

34 and 35.

When the cup 26 is almost fully within the dispenser housing 23 (FIGURES 2 and 2A), the follower point 42 travels over the intersection 36 and into slidable latching engagement with the cup-shaft cam lead surface 35. At this time, the spring 33 biases the follower point or latching surface 42 to move along the lead or control surface 35 away from the intersection 36. This causes the cupshaft 27 to continue to rotate or pivot clockwise until the baffle 29 is tightly engaged about the perimeter of the side opening into the cup housing compartment 24, and tightly latches the cup 26 in its fully closed position substantially totally within the dispenser housing 23 (FIG- URES 3 and 3A).

In accordance with the present invention, the sliding of the latching lever cam-follower point or latching surface 42 along the cup-shaft cam lead or control surface 35 is promoted by forming the lead surface 35 and the follower 41 in such a manner that the cam lead surface 35 and the lower follower edge will be disposed at an interfering rather than a complementary angle to one another when they are slidably engaged (FIGURES 3 and 3A).

The mechanism 30 will continue to hold the cup 26 in the tightly closed position (FIGURE 3) that is desired during the pre-rinsing, until the latching lever 32 is pivoted about the lever axle 38 to remove the follower 41 from sliding engagement with the cupshaft cam lead surface In order that the cup 26 can be automatically and positively re-opened at the commencement of the subsequent wash cycle, the outer periphery of the trip cam 20 is provided with a lobe surface 43. As illustrated in FIGURES 4 and 4A, the trip cam lobe surface 43 is rotated clockwise by the sequence control means 17 to slidably engage the upper edge of the latching lever upper arm and pivot the lever 33 counter-clockwise about the lever axle 38 to remove the lever follower 41 from engagement with the cup-shaft cam lead surface 35. Upon removal of the follower 41 from the lead or control surface 35, the cup- 26 is unlatched and the spring 33, sharply biases the cupshaft 27 to rotate counter-clockwise to pivot the cup 26 to its fully open position substantially wholly outside the dispenser housing compartment 24.

The abrupt opening of the cup 26 aids the dispensing operation since it tends to flick the detergent from the cup 26 to the wash chamber.

Furthermore, the spring 33 will continue to urge the cup 26 to remain in its fully open position until the door 10 is re-opened. Hence, the operator will be alerted to the need for refilling the cup with detergent.

FIGURES 57 and 5A-7A illustrate a modified form of the mechanism provided by the present invention for tightly closing and positively opening the dispenser cup 26.

This modified mechanism 44 also basically comprises:

6 (a) a cam or control part 45; (b) a cam-following latching lever 46; and (c) a tension spring 47.

The modified cam 45 also comprises a disc mounted on the protruding outer end of the cup-shaft 27 for rotation therewith. The outer periphery of the cam 45 is for-med with a curved lobe surface 48 and a shorter fiat lead or control surface 49. The cam lobe and lead

surfaces

48 and 49 intersect one another at an intersection 50 and the cam lead surface 49 declines from the intersection 50 to a pierced ear portion 51, which protrudes from the outer periphery of the cam 45 at a point opposite the intersection 50.

The modified cam-following latching lever 46 is substantially straight, and is pivoted adjacent one of its opposite ends on an axle 52, which is transversely spaced from the common plane of the cup and motor-powered shafts 27 and 19.

Assuming the door 10 is in its closed or substantially vertical position, the modified latching lever 46 can be viewed as being pivoted adjacent its lower end to its axle 52, which is mounted below the cup-shaft 27 on the outer face of the intermediate wall 15 of the door 10. As thus seen, the modified lever 46 has an upwardly projecting distal end and an inner edge which faces the outer periphery of the modified cup-shaft cam 45.

This inner edge of the lever 46 is formed with a protruding cam-follower 53 and pierced ear portion 54. The ear portion 54 is located between the pivoted lower end of the lever 46 and the cam-follower 53.

The cam-follower is formed with a curved upper surface 55 intersected by a substantially flat lower or latching surface 56 which declines to the lever inner edge.

The tension spring 47 for the modified mechanism 44 is respectively connected at its opposite ends to the

pierced ear portions

51 and 54 of the modified cup-shaft cam and

lever

45 and 46 to yieldably urge or bias the follower 53 into slidable engagement with the outer periphery of the cam 45.

As illustrated in FIGURES 5 and 5A, the modified cam 45 is so mounted on the cup-shaft 27, that, as the cup-like member or cup 26 is pivoted toward its closed position, the cup shaft cam 45 is rotated clockwise and the curved upper surface 55 of the modified latching lever cam-follower 53 can slide along the cup-shaft cam lobe surface 48 toward the intersection 50.

When the cup 26 is almost fully within the dispenser housing (FIGURES 5 and 5A), the lower or latching surface 56 of the follower 53 travels over the intersection 50 and into slidable latching engagement with the cam lead or control surface 49 at a contact point adjacent the intersection 50. At this time, the spring 47 biases the follower lower or latching surface '56 to the slide along the cam lead or control surface contact point in a direction away from the intersection 50 and toward the cup-shaft 27. This causes the cup-shaft 27 to continue to rotate or pivot clockwise until the battle 29 is tightly engaged about the perimeter of the housing side-opening 25, and tightly latches the cup 26 in its fully closed position substantially totally within the dispenser housing 23 (FIGURES 6 and 6A).

In accordance with the present invention, the sliding of the lower or latching surface 56 of the latching lever follower 53 along the cam lead or control surface contact point is promoted by forming the cam lead surface 49 and the follower lower surface 56 in such a manner that they will be disposed at an interfering rather than a complementary angle to one another when they are slidably engaged (FIGURES 6 and 6A).

The modified mechanism 44 will continue to hold the cup 26 in the tightly closed position (FIGURE 6A) until the latching lever 46 is pivoted clockwise about its axle 52 by modified trip means (not shown) operated by the sequence control means 17 at the commencement of the wash cycle to disengage the follower 53 from the cam lead surface 49. While these modified trip means are unshown, it should be understood that they can be similar to the trip cam 20, and are releasably engaged with the upper end of the modified latching lever 46.

As shown in FIGURES 7 and 7A, disengagement of the latching lever follower 53 from the cam lead surface 49 unlatches the cup 26, and the spring 47 sharply biases the cup-shaft 27 to rotate counterclockwise to abruptly pivot the cup 26 to its fully open position. The spring 47 will continue to urge the cup 26 to remain in its fully open position until the door 10 is re-opened.

From the foregoing description it will be observed that, in accordance with the present invention, a single tension spring connected between the cup shaft cam and the latching lever can act alternatively: (1) to bias the cup 26 toward the open position when the cup shaft cam lead surface and lever follower are disengaged from one another; and (2) to bias the cup 26 to the closed position when the cup shaft cam lead surface and lever follower are engaged with one another. The spring 31 can perform this dual function in the above-described mechanism 30 (FIGURES 2A-4A), as can the spring 47 in the modified mechanism 44 (FIGURES 5A7A).

FIGURES 8 and 9, respectively, diagrammatically illustrate the constructions of the

mechanisms

30 and 44 of the present invention which can enable the

single tension spring

30 or 47 of each to perform this dual function.

FIGURE 8 corresponds to FIGURE 2A and shows the condition of the mechanism 30 at the instant that its latch follower 41 travels over the intersection 36 and into sliding engagement with its cup shaft cam lead surface 35.

FIGURE 9 corresponds to FIGURE 5A and shows the condition of the modified mechanism 44 at the instant that its latching lever follower 53 travels over the intersection 50 and into sliding engagement with the lead surface 49 of the modified cup shaft cam 45.

In order that the

single spring

33 or 47 can perform its above-described dual function, the torque to pivot the cup shaft 27 clockwise to move the cup 26 toward its closed position (T must be greater than the torque to pivot the cup shaft 27 counter-clockwise to move the cup 26 toward its open position (T when the

mechanisms

30 or 44 are in the conditions shown in FIGURES 8 and 9, respectively. As illustrated in FIGURES 8 and 9, this is accomplished by appropriate sizing of the

cup shaft cam

31 or 45 and latching

lever

32 or 46 and spacing of their

respective pivot axles

27 and 38 or 52.

In accordance with the present invention, it has been found that, with either of the

mechanisms

30 or 44, T can be made to exceed T in the conditions illustrated in FIGURES 8 and 9 by sizing and arranging their

cup shaft cam

31 or 45 and latching

lever

32 or 46 so that L is greater than L L /L where: L equals the perpendicular distance or arm length between the axis of the cup shaft 27 and the axis of the force (F of the

spring

33 or 47 on the spring-pierced

cam portion

37 or 51; L equals the perpendicular distance or arm length between the axis of the cup shaft 27 and the axis of the resultant force (F of the

spring

33 or 47 on the cam lead or

control surface

35 or 49; L equals the perpendicular distance or arm length between the axis of the latching

lever axle

38 or 52 and the axis of the resultant force (F of the

spring

33 or 47 on the lever

follower lacting surface

42 or 56; and L equals the perpendicular distance or arm length between the axis of the latching

lever axle

38 or 52 and the axis of the force (F of the spring 47 on the spring-pierced portion of the latching

lever

32 or 46.

As will be evident from the foregoing description, certain aspects of the invention are not limited to the particular details of construction of the examples illustrated, and it is contemplated that various other modifications or applications will occur to those skilled in the art. For example, the housing member 23 might be mounted to the shaft 27 for pivotal movement therewith relative to the cup member 26 which could be made stationary. It is therefore intended that the appended claims shall cover such modifications and applications as do not depart from the true spirit and scope of the invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. In a treating agent dispenser having a cup member for receiving the treating agent and a housing member for covering the cup member, operating means comprising:

(a) a shaft mounting one of the members for pivotal movement relative to the other so as to selectively uncover the cup member from the housing member and cover it therewith,

(b) a control part on said shaft having a control surface thereon,

(c) a pivotally mounted latching lever having a latching surface movably engageable with said control surface to releasably retain the cup member in a covered position within the housing member, and

(d) yieldable means connected to said lever for biasing said latching surface to move along said control surface in a direction to pivot said shaft and the one member in a direction toward covering the cup memher when said latching and control surfaces are engaged with one another.

2. The invention of claim 1, wherein:

(a) said yieldable means is also connected to said control part and biases said control part to pivot said shaft and the one member in a direction toward uncovering the cup member when said latching surface is disengaged from said control surface, and

(b) said control and latching surfaces are so arranged that engagement therebetween under the force of said yieldable means biases said shaft and the one member in a direction toward covering the cup member.

3. The invention of claim 2, wherein:

(a) said yieldable means consists of a tension spring.

4. The invention of claim 2, further including:

(a) means for moving said lever against the force of said yieldable means to disengage said latching surface from said control surface, thereby to allow said yieldable means to pivot said shaft and the one memher in a direction toward uncovering the cup member.

5. The invention of claim 1, wherein:

(a) the cup member is mounted on said shaft for pivotal movement relative to the housing member.

6. In a treating agent dispenser having a housing member and a treating agent-receiving cup member which is movable through an opening in the housing member between an open position substantially wholly outside the housing member and a closed position substantially totally within the housing member, a mechanism comprising:

(a) a shaft mounting one of the members for pivotal movement relative to the other of the members,

(-b) a cam mounted on said shaft for rotation therewith,

(c) said cam having a lobe surface and a lead surface intersecting and declining from said lobe surface,

((1) a pivotally mounted latching lever having a cam follower movable along said cam surfaces, and

(e) yieldable means connected to said lever and biasing said follower to move along said lead surface away from its intersection with said lobe surface to pivot said cam and the attached shaft and one member in a direction to locate the cup member in the closed position when said follower is engaged with 3,419,192 9 10 8. The invention of claim 7, wherein: References Cited (2.) said yieldable means consists of a tension spring. UNITED STATES PATENTS 9. The invention of claim 6, wherein:

(a) id cam follower ha an apex slidable along both 12/1961 Kend? 222-166 Said cam Surfaces 5 3,062,412 11/1962 Cushing M 2 2- 6- 10, The invention of claim 6, wherein: 3212675 10/1965 Krzewma 222-166 said cam follower has a first surface slida-ble along 3300O96 1/1967 Perl 222 166 said cam lobe surface, and (b) said cam follower has a second surface slidable WALTER SOBIN Prlmary Examiner along said cam lead surface adjacent to the inter- 10 US. C1.X.R. section of said cam surfaces. 222-70