US3380107A - Duplex vacuum floor cleaning tool - Google Patents

Description

April 30, 1968 w. P. RIT ZAU ET AL 3,380,107

DUPLEX VACUUM FLOOR CLEANING TOOL Filed Aug. 29, 1966 I 5 Sheets-Sheet 1 INVYENTORS RONALD DANKS WILLIAM F. RITZAU THEIR ATTORNEYS April 30, 1968 w. P. RITZAU ET AL. 3,380,107

DUPLEX VACUUM FLOOR CLEANING TOOL Filed Aug. 29, 1966 3 Sheets-Sheet 2 O I HIM! 65 I m v i 70 44 20 /lo 48 52 as I 20 L 4 74 I2 ===gwi s llO 1.

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DUPLEX VACUUM FLOOR CLEANING TOOL Filed Aug. 29, 1966 3 Sheets-Sheet 3 INVENTORS RONALD DANKS WILLIAM P. RITZAU THUR ATTORNEYS United States Patent 3,380,107 DUPLEX VACUUM FL 0R CLEANING TOOL William P. Ritzau, Darien, Conn., and Ronald Danks, Santa Clara, Calif., assignors to Electrolux Corporation, Old Greenwich, Conn., a corporation of Delaware Filed Aug. 29, 1966, Ser. No. 575,788 8 Claims. (Cl. -417) This invention relates to a duplex floor cleaner tool for a vacuum cleaner having a nozzle body provided with a pair of opposed cleaning sides used respectively, for cleaning soft'surfaces such as rugs and hard surfaces such as wood floors, the cleaning sides being brought to cleaning position alternately by rotating the nozzle body about its associated elbow. The invention is more particularly concerned with providing means for automatically selectively positioning a control valve within the nozzle body to close off the air inlet at the side of the nozzle body which is not being used, upon rotation of the nozzle body about the tool elbow.

Multi-purpose vacuum floor cleaner tools having two cleaning sides either of which may be manipulated to a cleaning position by rotating the nozzle body of the tool about the tool elbow and wand with which it is connected are known in the art. The known duplex floor cleaner tool is provided with one cleaning side having a brush element for cleaning hard wood floors, linoleum covered surfaces, etc., whereas the other cleaning side has a smooth cleaning surface adapting it for use for'cleaning rugs, carpets, and like soft surfaces, with the respective cleaning sides being brought to cleaning position alternately by rotating the tool nozzle body 180 relative to the tool elbow. The duplex character of this vacuum cleaner tool requires that it be provided with valve means in the tool body which isolates the side of the tool that is not being used from the suction air supply in order to maintain maximum suction at the side of the tool on the floor or rug. Such valve means may take various forms, as for example it can be a snap-action leaf spring valve member or it may be a rotary valve member, in either case the valve means is selectively positioned between one of two closure positions to block the air passage leading to the side of the tool which is not in cleaning position.

The vacuum cleaner tool of the present invention is characterized by the feature that the proper selective positioning of the valve means therein is controlled by the manipulation of the cleaning tool body automatically upon the rotation of same about the suction tube or elbow with which it is connected. Thus, for example, if the brush side of the tool (hard surface cleaning) is in cleaning position and it becomes necessary to use the tool on a rug, the user picks up the cleaner tool and rotates it about the associated elbow to shift or interchange the cleaning side position. As the tool body rotates, means therein which are in engagement with the valve means become operable to shift automatically the positioning of the valve means out of its position closing the air suction passage leading to the rug cleaning side into a position opening the rug cleaning air passage and closing off the air suction passage leading to the floor cleaning side as the latter is moved to a non-leaning position. The valve positioning means in one form comprises a camming projection or stud fixed to the elbow of the tool and which upon relative rotation between the nozzle body and elbow engages with an actuating lever carried in the tool body and which is connected to the valve means. Engagement of the camming projection with the actuating lever is effective to move the actuating lever between two positions corresponding to the closure positions of the valve means. Thus, the aforementioned relative rotation between the nozzle body and associated elbow is effective to cause a shift of the position of the valve means to close the elbow associated with the side of the cleaner tool moved to a non-cleaning position. The valve actuating mechanism can be designed so that it is not effective to shift the valve position until the nozzle body is rotated about the elbow in excess of a predetermined magnitude, i.e., at least In this manner, a suitable range of relative rotation between the elbow and nozzle body in clockwise and counterclockwise directions is possible Without affecting the valve position when maneuvering the tool body beneath low objects such as sofas, cabinets, and the like.

According to the invention, the valve actuating lever is supported in the tool body for pivoting movement between the two positions thereof corresponding to the two valve closure positions and is coupled at one end with the valve means. A significant feature of the invention is that the positive opera-tion of the valve actuating lever is provided by a resilient portion whereby said resilient portion is deflected sufficiently to allow the camming projection to ride clear of the actuating mechanism subsequent to the positive shifting of the valve means to a selected closure position.

Further objects and advantages will become apparent from a consideration of representative embodiments of the principles of the invention to be described. The invention accordingly comprises the features of construction, combination of elements, and arrangement of parts, which will be exemplified in the construction hereinafter set forth and the scope of the invention will be indicated in the claims.

Reference should be had to the following detailed description taken in conjunction with the accompanying drawings in which:

FIGURE 1 is a plan view of a duplex vacuum cleaner tool constructed according to the principles of the present invention, parts of the tool body being broken away to illustrate constructional features thereof.

FIGURE 2 is a sectional view as taken along the line 22 in FIGURE 1.

FIGURE 3 is a sectional view as taken along the line 33 in FIGURE 1.

FIGURE 4 is a sectional view as taken along the line 44 in FIGURE 1, the rug-cleaning side of the vacuum cleaner tool being shown in cleaning position.

FIGURE 5 is a sectional view as taken along the line 55 in FIGURE 1.

FIGURE 6 is a perspective view of the valve actuating mechanism employed in the floor cleaner tool illustrated in FIGURES 1-5.

FIGURE 7 is a perspective view similar to FIGURE 6 illustrating a somewhat different form of valve actuating mechanism.

FIGURE 8 is a perspective view similar to FIGURES 6 and 7 illustrating still another form of valve actuating mechanism.

FIGURE 9 is a view taken generally along the line 99 in FIGURE 8 showing the condition of the resilient end of the actuating lever at first engagement of the camming projection therewith.

FIGURE 10 is the same as FIGURE 9 except it shows the manner in which the resilient end of the actuating lever yields to allow the camming projection to ride clear of the lever subsequent to shifting of the valve closure position.

Throughout the description like reference numerals are used to denote like parts in the drawings.

The valve positioning means of the present invention is described by way of example herein as being used in conjunction with a duplex vacuum cleaner tool having a snap action leaf spring type valve element wherein the valve element is selectively positionable between one or the other of two oppositely biased positions closing off, respectively, the suction passages leading to the floor cleaning side and the rug cleaning side of the cleaner tool. However, it should occur to those skilled in the art that the valve positioning means is suited for use with other types of duplex vacuum cleaner tool valve members as for example, a rotary valve of the type described in US. Patent No. 3,012,268.

Referring now to the floor cleaner tool construction shown in the drawings, which illustrate a duplex type having an elongated nozzle body comprised of interfitting upper and lower body members 12 and 14 respectively, connected together by suitable fastening means such as the countersunk screws 16 (FIG. 3). The structural arrangement of the upper and lower body members 12, 14 can be varied to facilitate manufacture and assembly but in general should be such when connected together to provide the nozzle body 10 with a pair of opposed elongated cleaning sides. Thus one side of the nozzle body 10 constitutes a fioor cleaning side used for cleaning wood floors, tile covered surfaces and the like, and to that end is provided with brush elements 18 extending longitudinally of the tool body and secured thereto in channels 20 formed in the upper body member 12 as best seen in FIGURE 4. The other cleaning side of the nozzle body 10 is used for cleaning rugs, carpets and similar soft surfaces and for that reason is provided with a protruding shoulder member 22 extending about the margin of the lower body member 14 with the shoulder being flattened along the rug contacting surface as at 24. The shoulder member can be formed integral with the lower body member or as in the embodiment illustrated by a separately formed element secured to the body member in known manner.

Each cleaning side of the nozzle body has an air suction opening which functions in the usual manner. Thus the floor cleaning side has an elongated laterally extending depression or recess 26 which as best shown in FIG- URE 1 communicates by means of a nozzle aperture 28 formed in the upper body member 12 with a central cavity 30 in the tool body, the latter being defined by complemental recesses formed in the respective body members. Similarly, the lower body member 14 is provided with a nozzle recess 32 which likewise extends longitudinally thereof and communicates with the central cavity 30 by means of a nozzle aperture 34 formed in the lower body member as shown. The suction passage 34 may have a somewhat greater width than the suction passage 28 in the upper body member. The nozzle apertures 28, 34 serve to connect the respective suction nozzle recesses 26, 32 with a source of suction air depending upon the position of the valve member in the tool body in a manner to be described.

The nozzle body 10 is provided with a rearwardly directed portion 42 which has a large opening for receiving elbow 44. A wand member 46, or other conduit-handle means, is connected to elbow 44 to establish communication between the nozzle body 10 and a tank type vacuum cleaner (not shown). The upper end of the elbow 44 may be provided with a collar 48 in which is housed a wand locking ring 50, the latter being of known construction and serving to securely connect the elbow to the wand. The horizontal branch 52 of the elbow 44 extends through rear housing cover plate 54 and is housed within the tool body as shown, the horizontal branch extending into the nozzle body a distance sufiicient to communicate with central cavity 30. The connection of the nozzle body 10 with elbow 44 is such that the nozzle body is rotatably on the elbow in a plane perpendicular to the axis of horizontal branch 52.

The valve member 40 is described herein by way of example as being a flat thin plate of spring metal normally maintained in a arcuately biased condition, and which is adapted to operate between two selected closure pOsitions within central cavity 30. The leaf spring or valve member 40 is supported at its ends in anchorages 31 formed at each side of the central cavity by suitable sur- 4 faces shaped in the structure of the upper and lower body members in regions where the said body members abut. Thus, when the rug cleaning side of the floor cleaner tool is in cleaning position, the valve member 40 is positioned in an upwardly arcuately biased conditon at the upper side of the central cavity as shown in full lines in FIGURE 3, and the central portion thereof closes off air passages 28, whereas when the nozzle body is rotated 180 around the elbow 44, the valve member 40 is shifted to an oppositely arcuately biased condition at the other side of the central cavity, as shown in long and short dashed lines, in which closure position it closes off the air passage 34 leading to the rug cleaning side which has been moved to a non-cleaning position by the rotational manipulation.

The movement of the valve member 40 between the two closure positions shown in FIGURE 3 is achieved by distorting the spring plate forming valve 40 in a direction opposite to its biased condition. One manner of distorting the spring valve 40 is to apply a force thereto at one or more locations intermediate the ends thereof, thereby deforming it for example from the solid line closure position of FIGURE 3 into a serpentine configuration, as indicated by line 40a FIG. 3, and through a point of no return position causing it to snap over intO an oppositely biased condition, as for example, the closure position shown in long and short dashed lines of FIG. 3. The distorting force is applied to the spring valve 40 by the movement of an actuating lever assembly 62 (see FIG. 6), which is located in the nozzle body 10 at one side of the elbow 44 as shown in FIGURE 1. The actuating lever assembly 62 is comprised of a main lever 110 the front end of which is coupled to the spring valve 40 a distance from one end thereof. An auxiliary lever member 112 comprises the rear section of the actuating lever assembly and extends closely adjacent the suction tube as shown. Both the main lever member 110 and the auxiliary lever member 112 are supported on a suitable pivot 66 carried within the nozzle body neck portion 42, the latter having a vertical clearance passage as at 70 (FIG. 3) in which the actuating lever members move when pivoted. The pivoting movement of the actuating lever assembly is in a plane parallel to a vertical plane passing through the axis about which the tool body is rotatable. The main lever member is bent so that the front end, coupled to the valve spring, is laterally displaced relatively to the rear part 114, and the front end is shaped in the form of a fork, with the tines 74 of the fork embracing the leaf spring as shown. As shown in FIGS. 1 and 6, both the main lever 110 and auxiliary lever member 112 are preferably comprised of flat spring steel stock with the main lever 110 being mounted on pivot 66 in such a manner that its major surface extends perpendicular to the axis of the pivot thus providing main lever 110 with a relatively high section modulus to resist bending. On the other hand, auxiliary lever 112 is mounted to have its major surface extend parallel to the pivot axis and in consequence possesses a low section modulus making it fairly susceptible to bending in a manner to be described. The rear part 114 of main lever member 110 is slotted as at 116 and serves to receive a tab 118 integral with the auxiliary lever member 112. The slot 116-tab 118 arrangement provides a connection means effective to insure unitary pivoting movement of the levers 110, 112 of the actuating lever assembly 62 when shifting the valve member 40 between its operative positions. As shown in FIGURE 4, the front end of the actuating lever 110 normally extends upwardly as the spring valve 40 is biased in an upward direction in a clossure position across the aperture 28 leading to the floor cleaning side and thereby preventing communication of said aperture with central cavity 30. Thus air drawn into the nozzle body 10 enters by way of the nozzle opening 32 associated with the rug cleaning side and via elbow 44 and wand 46 draws into the vacuum cleaner (not shown), dirt, dust and other objects on the rug surface being cleaned. On the other hand, when the nozzle body is rotated onehalf revolution to place the other cleaning side on a floor, an opposite biasing force is applied to the spring valve by the actuating lever 110 deforming the spring valve 40 into a serpentine configuration and snapping it through a dead-center point causing it to arcuately bow in an opposite sense from the closure position shown in solid lines in FIGURE 3 to the closure position shown in long and short dashed lines of this figure. In the latter position, the spring valve 40 seats against the seating surfaces 76 at the bottom of the nozzle body 10 closing oif the suction passage 34 leading to the rug cleaning side and automatically placing the floor cleaning side in communication with the central cavity 30. Similar seating surfaces also are provided at the top of the tool body adjacent suction passage 28.

The mode of operating the actuating lever assembly 62 to shift the position of the valve member within the tool body will now be described. As shown in FIGURES 2 and 4 to 6, the elbow 44 is provided at the bottom thereof with a camming projection 78 which can be either formed integrally with the elbow 44 or be made as part of a separate ring member fixed on the elbow. The camming projection 78 is adapted to engage with the auxiliary lever member 112 when the nozzle body is rotated, to thereby pivot the entire actuating lever assembly 62 from one to the other of its operating positions. In rotating the nozzle body 10 to alternate the positioning of the cleaning sides, the nozzle body is rotated about the elbow 44 which remains fixed although in fact the elbow is free to rotate at least 90 relative to the tool body such as when manipulating the nozzle body under low objects including sofas, beds, etc. by turning the wand 46 to one side or the other in the customary manner without changing the valve member position.

For proper operation of the valve actuating assembly 62 when changing the nozzle body 10 from a rug cleaning position to a floor cleaning position, the nozzle body 10 must be rotated clockwise when viewed in FIGURE 3, and counterclockwise when changing over from a floor cleaning to a rug cleaning position. To insure that these proper rotational directions are followed, the tool body is provided with a weight 84 (FIG. 3) which initiates rotation in the right direction. When the nozzle body 10 is rotated by the weight 84, it turns one-half a revolution or about 90 from whatever cleaning position the nozzle body was in. The valve member position is not changed, however, until the tool body is rotated relative to the suction tube through an angle in excess of about 90. At about 90 of relative rotation, however, one fiat side 125 of the camming projection 78 engages with one face of auxiliary lever member 112 so that a small additional relative rotation beyond 90 will pivot the actuating lever assembly, for example, from the position shown in solid lines in FIGURE 4 to the position shown in dashed lines with a corresponding shift of the valve member to a closure position then closing oif the suction passage 34 leading to the rug cleaning side. The spring steel lever member 112 and the effective lever length thereof are selected such that contact between the auxiliary lever member 112 with the camming projection 78 does not result in any flexure or bending of the auxiliary lever member. On the contrary, the auxiliary lever member maintains sufiicient rigidity to move main lever member 110 until the whole actuating lever assembly 62 pivots from one to the other of its operating positions. However, after pivoting the lever assembly, it is necessary that the camming projection 78 be able to clear the auxiliary lever member 112 and move through 180 of relative rotation between the elbow and nozzle body to complete the interchange of cleaning sides. This is accomplished by the resilient structure of the auxiliary lever member 112 which, as soon as the valve member closure position has changed, and it is not possible for main lever member 110 to continue to pivot (clockwise-FIGURE 4), auxiliary lever member 112 starts to flex upwardly from the solid line position shown in FIGURE 6 to that shown in dashed lines and ultimately rides free of the camming projection. Upon its disengagement from the camming projection, auxiliary lever member 112 springs back to a linear shape in position to once again engage the camming projection when returning the rug cleaning side of the nozzle body to a cleaning position by rotating the nozzle body counterclockwise.

FIGURE 7 shows a somewhat different form of construction wherein the actuating lever generally designated 162, instead of comprising a main lever member and auxiliary lever member, consists of a single piece of spring steel having a front part 163 which is shaped as described above in connection with main lever member 110, whereas the rear part 164 is twisted relative to the front part. Actuating lever 162, however, functions in the same manner as the actuating lever assembly 62.

FIGURES 8 to 10 show still another form of actuating lever assembly 262 wherein the assembly comprises a main lever member 263 which serves the same purpose as the main lever member previously described. It also includes an auxiliary lever member 265 which, in contrast with auxiliary lever member 112, extends in the same plane as the main lever member with which it is associated. Thus the auxiliary lever member 265 comprises a flat strip which at the rear end thereof extends a distance beyond the terminal end of main lever member 263. A torsion spring 270 mounted on pivot 66 has a pair of arms 272, 273 the ends of which have lateral extensions engaging above and below both the main and auxiliary lever members as shown. The torsion spring 270 has sufficient strength to resist any secondary pivoting of the auxiliary lever member 265 unit after the entire actuating lever assembly has been shifted from one to the other of its two operating positions. However, after the lever assembly 262 has completed its pivotal movement, the auxiliary lever member 262 pivots from the position shown in FIGURE 9 to the position shown in FIGURE 10 to allow the camming projection 78 to ride clear of the lever assembly. As soon as the camming projection is clear the torsion spring 270 will then return the auxiliary lever member to the position shown in FIGURE 9.

Various other changes and different embodiments of the valve mechanism of the present invention can be made within the principles described and indicated in the foregoing, and it is intended that all matter set out therein or shown in the accompanying drawings should be interpreted as illustrative and not in a limiting sense.

What is claimed is:

1. In a duplex vacuum floor cleaner tool which includes an elbow, a nozzle body rotatably connected to said elbow and having a pair of opposed cleaning sides which are brought to a cleaning position alternately by rotating said body one-half revolution on said elbow, said body having a pair of apertures opening within said body for communicating each of said cleaning sides and a central cavity within the body, said central cavity communicating with said elbow, and a valve member supported in said body and normally positioned therein in a position closing off the one of said pair of apertures associated with the said cleaning side which is in a non-cleaning position thereby to block communication of the said one aperture with said central cavity; valve positioning means comprising a projection fixed to said elbow, and a valve actuating assembly supported in said body for movement between two positions corresponding to the closure positions of said valve member and having a part operatively coupled with said valve member, said valve actuating assembly having another part which is engaged by said projection when said body and suction tube are rotated relative to each other a distance in excess of a predetermined magnitude thereby moving said valve actuating assembly from one to the other of its two positions and shifting the position of said valve member to the corresponding closure position, said other part of the valve actuating assembly comprising a resilient element having resistance to fiexure during movement of said valve actuating assembly between said two positions, but which flexes under the force of continued relative rotation of said body and elbow beyond said predetermined magnitude for disengaging said projection from said other part of the valve actuating assembly.

2. The duplex vacuum floor cleaner tool set forth in claim 1 wherein the predetermined magnitude in excess of which relative rotation between said body and elbow is effective to shift the valve member position is substantially 90.

3. The duplex vacuum floor cleaner tool set forth in claim 1 wherein said valve actuating assembly comprises lever means supported in said body for pivoting movement between said two positions, said lever means being pivotal about a point intermediate its ends, one end of said lever means having coupled with said valve member, the other end of said lever means comprising a resilient portion engaged by said projection when said body and suction tube are rotated relative to each other.

4. The duplex vacuum floor cleaner tool set forth in claim 3 wherein said lever means comprises a first lever member pivoted in said body intermediate its ends, one end of said first lever member being coupled with said valve member, and a second lever member pivoted at one end on the same pivot axis as the first lever member, said second lever member being connected to said first lever member and having a free end extending beyond the outer end of said first lever member, said free end being engageable with said projection and comprising a blade spring.

5. The duplex vacuum floor cleaner tool set forth in claim 4 wherein said first and second lever members are relatively fiat members, the plane of the body of the first lever member extending perpendicular to the axis about which it pivots, the plane of the body of the second lever member extending transverse to that of said first lever member.

6. The duplex vacuum floor cleaner tool set forth in claim 3 wherein the other end of said lever means comprises a rear part being bent relative to the plane of the major surface of said one end; said lever means consisting of spring steel.

7. The duplex vacuum floor cleaner tool set forth in claim 3 wherein said lever means comprises a first lever member pivoted in said body intermediate its ends, one end of said first lever member being coupled with said valve member, a second lever member pivoted at one end on the same pivot axis as the first lever member and having a free end extending beyond the other end of said first lever member, said free end being engageable with said projection, and a torsion spring having a pair of legs with lateral branches enclosing each of said lever members at opposite edges thereof, said torsion spring having sufiicient strength to provide for unitary movement of said lever members when said valve actuating assembly is pivoted between its two positions, said torsion spring having insufiicient strength to prevent secondary pivoting of said second lever member subsequent to movement of said assembly and continued relative rotation of said elbow and body beyond said predetermined magnitude.

8. The duplex vacuum floor cleaner tool set forth in claim 1 wherein said valve member comprises a thin plate of spring steel connected in said nozzle body at opposite ends for normally imparting an arcuate shape thereto, said valve actuating member moving said spring plate to its dead center position whereby said plate snaps into an opposite arcuate shape.

References Cited UNITED STATES PATENTS 2,500,977 3/1950 Beede 15-373 2,838,783 6/1958 Allen 15-417 2,873,469 2/1959 Borkoski l54l7 3,048,877 8/1962 Descarries l54l7 ROBERT W. MITCHELL, Primary Examiner.

Claims (1)

1. IN A DUPLEX VACUUM FLOOR CLEANER TOOL WHICH INCLUDES AN ELBOW, A NOZZLE BODY ROTATABLY CONNECTED TO SAID ELBOW AND HAVING A PAIR OF OPPOSED CLEANING SIDES WHICH ARE BROUGHT TO A CLEANING POSITION ALTERNATELY BY ROTATING SAID BODY ONE-HALF REVOLUTION ON SAID ELBOW, SAID BODY HAVING A PAIR OF APERTURES OPENING WITHIN SAID BODY FOR COMMUNICATING EACH OF SAID CLEANING SIDES AND A CENTRAL CAVITY WITHIN THE BODY, SAID CENTRAL CAVITY COMMUNICATING WITH SAID ELBOW, AND A VALVE MEMBER SUPPORTED IN SAID BODY AND NORMALLY POSITIONED THEREIN IN A POSITION CLOSING OFF THE ONE OF SAID PAIR OF APERTURES ASSOCIATED WITH THE SAID CLEANING SIDE WHICH IS IN A NON-CLEANING POSITION THEREBY TO BLOCK COMMUNICATION OF THE SAID ONE APERTURE WITH SAID CENTRAL CAVITY; VALVE POSITIONING MEANS COMPRISING A PROJECTION FIXED TO SAID ELBOW, AND A VALVE ACTUATING ASSEMBLY SUPPORTED IN SAID BODY FOR MOVEMENT BETWEEN TWO POSITIONS CORRESPONDING TO THE CLOSURE POSITIONS OF SAID VALVE MEMBER AND HAVING A PART OPERATIVELY COUPLED WITH SAID VALVE MEMBER, SAID VALVE ACTUATING ASSEMBLY HAVING ANOTHER PART WHICH IS ENGAGED BY SAID PROJECTION WHEN SAID BODY AND SUCTION TUBE ARE ROTATED RELATIVE TO EACH OTHER A DISTANCE IN EXCESS OF A PREDETERMINED MAGNITUDE THEREBY MOVING SAID VALVE ACTUATING ASSEMBLY FROM ONE TO THE OTHER OF ITS TWO POSITIONS AND SHIFTING THE POSITION OF SAID VALVE MEMBER TO THE CORRESPONDING CLOSURE POSITION, SAID OTHER PART OF THE VALVE ACTUATING ASSEMBLY COMPRISING A RESILIENT ELEMENT HAVING RESISTANCE TO FLEXURE DURING MOVEMENT OF SAID VALVE ACTUATING ASSEMBLY BETWEEN SAID TWO POSITIONS, BUT WHICH FLEXES UNDER THE FORCE OF CONTINUED RELATIVE ROTATION OF SAID BODY AND ELBOW BEYOND SAID PREDETERMINED MAGNITUDE FOR DISENGAGING SAID PROJECTION FROM SAID OTHER PART OF THE VALVE ACTUATING ASSEMBLY.

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