US3082627A - Valve actuating trip means - Google Patents

Description

March 26, 1963 R. H. YEO ETAL 3,082,627

VALVE ACTUATING TRIP MEANS Filed Sept. 19. 1960 2 Sheets-Sheet 2 ,A @Emiliani llfllllll/lfllllll/llllllvlllllllll/lll/l/l'/ f INVENTOR.

BY Enel J. CouLsoN JR.

Flr-ro Nsvs.

Rogier H. 4Viso mvp ite Stats This invention relates to a valve and valve operating mechanism `by which the valve can be manually opened and closed as long as an associated electric circuit is energized, and which in the event of the failure of the electric circuit will automatically close the valve and become inoperative to reopen the valve until the electric circuit is re-established.

Many units of industrial equipment require for normal operation both the ow of a fluid and the concurrent existence of an electric circuit such as the circuit of a llame-sensing device, a temperature or pressure limiting device, or other safety device, or the circuit of an electric motor for driving some element of the equipment. For example, in the case of an oil or gas furnace, the ow of the oil or gas fuel is normally controlled by some safety device and may be accompanied by the operation of an electric motor which drives some related element, for example, a blower to provide combustion air or a blower or pump for the fuel or some other fluid. In many such cases, it is essential for safety that the flow of gas or oil should be immediately shut olf in the event of opening of the safety circuit or of failure of the electric circuit supplythe electric motor.

It is the object of our invention to provide a uidcontrol valve and valve-operating mechanism which under normal conditions, that is, while an associated electrical circuit is energized, will permit the valve to be manually opened and closed, and will hold the valve open as long as such normal conditions prevail, and which in the event of failure of the associated electric circuit will automatically close the valve and render itself inoperative to open the valve until the electric circuit has been re-established. It is a further object of the invention to provide such a valve operating mechanism which is of improved, simple, and eifective construction. It is a further object of the invention to combine such a mechanism with a signal device which will indicate, either locally or at a distance, the condition of the valve.

In accordance with the invention, an axially reciprocable valve-operating rod is biased to valve-closing position and is arranged to lbe moved to open position by pivotal movement of a lever linked to a manually operable crank arm. The lever is preferably a lever of the third class, that is, a lever in which the fulcrum is at one. end, the valve-actuating rod is connected at the other end, and the manually operable crank arm is linked to an intermediate point, desirably a point closer to the valve operating rod than to the fulcrum. The fulcrum support for lever desirably consists of a pivoted rocker which carries a fulcrum stool, and such support is normally unstable and incapable of supporting the lever and is held in fulcrum-supporting position by an electromagnetic device energized by or with the associated electric circuit. the event such circuit is de-energized, the fulcrum stool collapses or moves out from under the lever and permits the fulcrumed end of the lever to drop, thus releasing the valve rod for movement to valve-closed position under the inuence of its bias to that position. When the electrical circuit is re-established, the electromagnetic device will again hold the fulcrum stool in lever-supporting position, and by movement of the manually operable handle to latching or reset position, the lever will return to its nor- 3,082,527 Patented Mar. 26, 1953 mal operating relationship ready for pivotal Valve opening movement about the fulcrum stool.

Desirably, the valve operating rod actuates an indicating plate which is exposed through a window when the valve is open and which is moved away from the window when the valve is closed. A switch actuating arm may be carried with such indicating plate, to actuate a switch for operating a remote signal mechanism for indicating the condition of the valve.

The valve operating mechanism is desirably housed in Y a casing having an open side, and having a partition wall Inl forming an electrical junction box opening to the same side ot' the casing; and a single cover plate closes the open sides of both the casing and the junction box.

These and other objects and features of the invention are illustrated in the embodiment shown in the drawings and more fully described below.

The accompanying drawings illustrate the invention. In such drawings:

FIG. l is a front elevation of a valve and valve operating mechanism embodying the invention, with parts broken away to show the valve structure and the valve operating mechanism, the full-line showing being with the valve in closed position and the lever and fulcrum in latch position;

FIG. 2 is a view' similar to FIG. 1 but with the full V lines showing the parts in valve-open position;

FIG. 3 is a partial section similar to FIGS. l and 2, but showing the position of the electromagnetic armature and the fulcrum stool when the electrical circuit is interrupted;

FIG. 4 is a partial section taken on the line 4 4 of FIG. 1, showing the fulcrum stool and electromagnetic device in front elevation;

FIG. 5 is a horizontal section showing the Valve operating mechanism in top elevation with the parts in the positions shown in FIG. 2;

FIG. 6 is an end elevation of the valve mechanism shown in FIG. l, with parts broken away to show the indicator mechanism;

FIG. 7 is a front elevation of the manually operable valve handle and its indicating dial and stop mechanism; and

FIG. 8 is a diagrammatic side elevation of the fulcrum support, on an enlarged scale.

The device shown in FIG. 1 comprises a valve body 10 having an inlet port 12 and :an outlet port 14, land containing .a pair of valve seating rings 16 and 18 bearing against the sides of a valve gate 20 which is vertically movable -between the upper closed position shown and a lowered position which brings a valve opening 22 into registry with the openings through the seating rings 16 and 18. The seat ring 16 is sealed to the valve body 10, as by an O-ring, and `the seat ring 18 is spring pressed Iagainst the face of the valve plate, `as by a spring washer 24. The upper end of the valve body carries `a rect-angular mounting plate 26 closed by a cover plate 28 through which .the valve operating rod 30` is slidably movable and in which such rod is sealed -by a suitable sealing gland.- The rod 30 carries Va collar or body 72 at its upper end, Iand is biased to valve-closed position by a spring 31 acting between the `cover 28 and the body 72. As indicated in FIG. 5, the cover plate 28 is fixed to the rectangular mounting plate 26 by a pair of socket-head bolts 32 at opposite corners of the rectangular plate. The other pair of opposite corners is adapted to receive hex-head stud bolts 34 for mounting on the valve bod-y the casing 40 of the valve-operating mechanism. As indicated in FIG. 6, this 'casing 40 comprises top, bottom, and end walls forming an open body `of rectangular cross section. This is. adapted to` be closed by -a front 'or handle cover plate 44 and a rear or access cover plate 46. Partition walls 48 and 49 form an electric junction box within the casing 40, and this is closed by the upper part of the rear cover plate 46. An opening in the bottom wall 49 of the junction box l) permits electrical connection to the valve operating mechanism, and an opening in the end wall of the junction box 50 provides yfor connection to an electric conduit.

The central portion of the front cover plate 44 carries a sleeve S2 in which is journalled `a manual operating arm 54, sealed by `an O-ring 53. This carries a dial indicator 56 having a rearwardly projecting stop ange 58 over approximately 180 degrees of its circumference, and such flange cooperates with a -xed stop 60 formed on the cover plate `44 to limit the Imovement of the manual operating arm 54 to 180 degrees of throw. The rear end of the operating arm 54 carries a crank 62 having -a crank pin 64for operating the valve. This is connected by a link 66 to lan intermediate point on a lever 68. Such lever is conveniently formed from a pair of curved side plates 69 held in spaced relation by a plurality of rivets and spacers along its length. The left end of the lever 68 as shown in FIGS. l and 2 is connected by -a pin 70 to the valve operating body '72 fixed to the upper end 'of the valve operating rod 30. The opposite end of the lever 68 carries a roller 74 which normally rests on the top surface of a fulcrurn stand when .the device is in latched valve-operating condition.

When the fulcrum support comprising the stool 76 is in operative position Aas shown in lfull lines in FIGS. 1 and 2, the valve 22 can be opened and closed at will by operation `of the handle 55. Moving such handle counterclockwise from its position in FIG. l causes the crank 62, acting through the link 66, to tilt the lever xabout its fulcrum roller 74, and this depresses the valve rod 30 to valve-open position as shown in FIG, 2. The crank pin `64. moves past dead center as ,the handle kends its movement, andthe valve is then locked in open position. Reverse movement of the handle 55, clockwise from the position of FIG. 2, will return the lever .to its position in FIG. l and allow `the valve to close.

The fulcrum support shown in the drawings comprises the Aulcrum stool 76 pivotedby a pin 78 on a rocker or bell crank 89. The -bell crank 80 (FIGS. 3 and 4) has a pair of side plates 84 and S6 interconnected by the pivot pin 78 and by two spacing rivets 88 and 89, and is pivot-allymounted on a lixed pin 82` between :two bosses on the casing 40. The stool 76 is held counter-clockwise against the pin 89 as a stop, -by means of a spring S1. One side plate 86 of the bellcrank extends laterally to support a yoke 90 having a slotted upper end which engages a pin 92 carried by an armature 94 of an electromagnetic device 96.

The fixed pin 82 supporting the rocker 80 and the fnlcrum stool 76 lies a substantial distance below the point engaged by the lever roller 74, generally in the direction of the line of `force exerted by the roller on the fulcrurn stool, `and offset inwardly from that line of force. Further, the upper face of the fulcrum stool engaging the roller 74 has a slope such that the interengagement tends to pivot fthe fulcrurn stool 76 counter-clockwise toward vits stop 89 and tends tto pivot the combined rocker 80 and stool 76 as a unit clockwise away from its lever supporting position. To this end, the slope is such that aline normal to the face at the point of roller engagement will lpass between the axes of :the two pins 7-8 and 82. For this purpose, ythe roller engaging face of the fulcrum stool 78 desirably lies on an arc of radius R about a -point C between the centers of the stool pin 78 and the rocker -pin 82. As a result, Ithe -fulcrum support 76-80 is unstable in the full line position of FIGS. 1 and 2, and tends to pivot clockwise to the position shown in FIG. 3. Any pressure of the fulcrum roller 74 on the fulcrum stool 76 tends to cause the bell crank to pivot in such direction. This will carry the fulcrurn stool 76 out from under the fulcrum roller 74 and destroy the support for such roller 74 and for the norm-ally fulcrumed end of the lever 68.

Accordingly, the fulcrurn support 76-80 is capable of supporting the fulcrum roller 74 only when the bell crank is held in its counterclockwise position by the electro`d magnetic device 96 actuated by the energization of the controlling electric circuit. When the electric circuit of the magnetic device 96 is not energized, the fulcrum `support 76-80 will not support the lever, and it will be impossible to open the valve from its closed position to its open position. Instead, as indicated in FiG. 3, any attempt to actuate the lever by manipulation of the manual operating rod 54 will simply swing the lever 63 freely about the pin 78 by which it is connected :to the valve `operating body 72, and the mechanism will be incapable of overcoming the bias of the biasing spring 31 which holds the valve 2G in closed position.

When the electromagnetic device is energized, however, its armature 94 will pull the bell crank to its counterclockwise position as shown in full lines in FGS. yl and 2, the iulcrum stool 76 Will move to its latching position as shown in FIG. l, where it will be in position to underlie the fulcrum roller 74, but will be retractable clockwise (FIG. 2) against its spring 8l to pass the roller 74 from its dotted line position in FIG. 2 to its full-line position in FIG. l. Placement of the manual operating arm 54 in its Latch position (FIG. l) will dispose the lever 68 in its raised position, with its fulcrum roller 74 overlying the fulcrurn stool 76, and subsequent movement of the lever to its Open position (FIG. 2) wil-l be citeetive to move the valve from closed to open position as has been described. With the valve held in open pcsition bythe lever and with the parts in the position shown in full lines in FIG. 2, if the electrical circuit becomes deenergized for any reason, the bell crank or rocker Si) will be released for clockwisey pivotal movement under the influence of the force exerted on the fulcrum stool 76 by the fulcrum roller 74. Such clockwise movement of the bell crank will carry the fulcrum stool 76 out from under the fulcrum roller 74 .and remove the fulcrurn supe port for the lever 68, leaving it free to swing about its point of connection to the operating link 66 to the position shown in dotted lines in FIG. 2. This will permit the spring 31 to move the valve-operating rod 38 from its valve-open position shown in fu-ll lines in FIG. 2 to its valve-closed position shown in -dotted lines in PEG. 2 and in full lines in FIG. l. Accordingly, the valve actuating mechanism will automatically release the valve to closed position in the event of any failure of the electric circuit energizing the electromagnet device 96. As long as that electric circuit remains de-energized, it will be impossible to re-open the valve, for the fulcrum stool will be in nonsupporting position as shown in FIG. 3, and any operation of the manual operating arm 54 will merely cause the lever 68 to swing freely about the pin 70 and not to actuate the valve rod 36.

The end Wall 41 of the casing 40 carries a window 100 behind which a plate 102 carries a suitable legend such as the word Shut indicating that the valve is closed. Such plate 102 is spaced behind the window to permit a curtain plate 164 carried with the valve operating rod 39 to drop -from its full line position of FIG. l to its lowered position of FIG. 2 in front of the plate 162. Such curtain plate 104 will cover the legend Shut and will carry on its front face a suitable legend indicating that the valve is open, for example, `the word Open The legend exposed through the window 106i will indicate directly whether the valve operating stem 30 is in open or shut position. It is of course desirable to have this visual indication since the fact that the manual operating arm S4 is in open position :does not necessarily indicate that the valve is open, for the valve may be closed, as shown in dotted lines in FG. 2, by reason of the failure of the electrical circuit energizing the magnetic device 96.

Conveniently, the curtain wall 1M carries a laterally projecting arm 106 which in raised position actuates the arm ltt of a switch llt? which may be connected to a remote signal device to indicate the condition of the valve.

We claim as our invention:

l. A device lfor operating a valve, comprising (a) an operating member movable between first and second positions Iand biased to its said second position,

(b) a lever pivotally interconnected at an operating point with said operating member and having a fulcrum point spaced from said operating point,

(c) an actuating member interconnected with said lever at an actuating point spaced from said operating and fulcrum points,

(d) said actuating member being operable, in the presence of support for said fulcrum point, to pivot said lever thereabout for moving said operating member to its said first position, and in the absence of such support, to swing said lever about its operating point of interconnection with said actuating member,

(e) a fulcrum support having a lever-supporting position in which the fulcrum point of said lever is supported .thereon and exerts thereon a force in a predetermined line,

(f) means for mounting said fulcrum support on a fixed axis transverse to said line,

(g) said fulcrum support being movable about said axis, in a predetermined direction relative to said line, to a non-supporting position clear of said lever,

t l1) said iixed axis being spaced a relatively substantial distance along said predetermined line from said fulcrum point and being offset a relatively small distance from said line in a direction opposite to said direction of fulcrum support movement, the position of said fixed axis being such that the lever force on the fulcrum support has a relatively large major component in the direction of said fixed pivot axis for transmitting substantially the entire lever force directly to said fixed axis and has a relatively small minor component in said predetermined direction tending to pivot said fulcrum support from its leversupporting position to its lever-clearing position,

(i) and electromagnetic means operatively connected to said fulcrum support and operable, when energized, to retain said fulcrum support in its said lever-supporting position.

2. A device for operating `a valve as defined in claim l,

further comprising (a) a roller on one and a roller-engaging face on the other of said fulcrum support and said lever at its said fulcrum point,

(b) said roller-engaging face being sloped to recede in the direction of relative movement of the roller thereover during pivotal movement of the fulcrum support from lever-supporting to lever-clearing position.

3. A device for operating a valve as defined in claim l in which (n) said xed axis is positioned along said predetermined force line in the direction of lever force on said fulcrum support,

(b) and said fulcrum support forms a strut stressed in compression between said lever fulcrum point and said iixed axis.

4. A device for operating a valve as defined in claim 1 in which (a) one of said operating and actuating members is confined to linear movement in a predetermined path and said lever is pivoted thereto to tix the lengthwise position of the lever in its angular lever movements,

(b) and the fulcrum support supports lthe fulcrum point of the lever for movement thereon lengthwise o-f the lever during angular lever movement about the supported fulcrum point.

5. A device for operating a valve, comprising (a) an operating member movable between irst and second positions and biased to its said second position,

(b) a lever pivotally interconnected at an operating point with said operating member and having a fulcrum point spaced from said operating point,

(c) an actuating member interconnected with said lever at an actuating point spaced from sai-d operating and fulcrum points,

(d) said actuating member being operable, in the presence of support for said fulcrum point, to pivot said lever thereabout for moving said operating member to its said first position, and in the absence of such support, to swing said lever about its operating point of interconnection with said actuating member,

(e) a fulcrum support having a lever-supporting position in which the -tulcrum point of said lever is supported thereon and exerts thereon a force in a predetermined line,

(f) said fulcrum support, in said lever-supporting position, forming a strut stressed in compression between said lever and a iixed point spaced a substantial distance along said predetermined line in the direction of lever force on said fulcrum support,

(g) said strut being inherently unstable in said leversupporting position, and in the absence of retention therein being incapable of supporting the lever,

(h) and electromagnetic means having an armature connected to control said strut and operative when energized to retain said strut in lever-supporting position.

6. A device for operating a valve, comprising (a) an operating member movable between first and second positions and biased to its said second position,

(tb) a lever pivotally interconnected at an operating point with said operating member and having a fulcrum point spaced from said operating point,

(c) an actuating member interconnected with said lever at an actuating point spaced -from said operating and fulcrum points,

(d) said actuating member being operable, in the presence of support for said fulcrum point, to pivot said lever thereabout for moving said operating member to its said iirst position, and in the absence of such support, to swing said lever about its operating point of interconnection with said actuating member,

(e) a roller on said lever at said fulcrum point,

() a fulcrum support having a roller-engaging face for supporting said roller in fulcrum position,

(g) and structural means supporting said face from a pivot axis spaced in the direction of and oiset from a line normal to said .face at its point of engagement by said roller,

(h) said fulcrum support being pivotally movable about said axis in a predetermined direction to carry said face out of supporting relation with lsaid roller,

(i) said face being sloped to recede in the direction of relative movement of the roller thereover during such pivotal movement of the fulcrum support, whereby roller force on said face tends to move the fulcrum support to non-supporting position,

(j) and electromagnetic means which in energized state exerts traction on said fulcrum support to maintain said face in roller-supporting position.

7. A device for operating a valve, comprising (a) an operating member movable between -tirst and second positions and biased to its said second position,

(b) .a lever pivotally interconnected at an operating 7 point with said operating member and having a fulcrum point spaced from said operating point,

(c) an actuating member interconnected with said lever at an actuating point spaced from said operating and fulcrum points,

(d) said actuating member being operable, in the presence of support for said ulcrum point, to pivot said lever thereabout for moving said operating member to its said rst position, and in the absence of such support, to swing said lever about its operating point of interconnection with said actuating member,

(e) a fulcrum support for said lever, comprising `a stool having a lever-supporting platform, a rocker member mounted on a rocker pivot axis and supporting said stool on a stool pivot axis, and a stop on said rocker against which Said stool is biased in a normal lever-supporting position,

(f) said rocker pivot axis being spaced from said platform in the direction of and offset from the line of force exerted by the lever on the platform, said rocker-pivot axis being thereby positioned so that said rocker, under the inuence of said force, tends to rock in a direction to carry the stool away from lever-supporting position and release the fulcrum point of the lever for free swinging movement,

(g) and an electromagnetic device which in energized state exerts traction on said rocker to move the same to and maintain it in a position supporting the stool in lever-supporting position.

8. A device for operating a valve, comprising (a) an operating member movable between first and second positions and biased to its said second position,

(b) a lever pivotally interconnected at an operating point with said operating member and having a fulcrum point spaced'from said operating point,

(c) an actuating member interconnected with said lever at an actuating point spaced from said operating and fulcrum points,

(d) said actuating member being operable, in the presence of support for said fulcrum point, to pivot said lever thereabout for moving said operating member to its said first position,

(e) a fuicrum support for lsaid lever, comprising a stooi pivotally mounted on a iirst axis on a rocker mounted on a iixed second axis,`

(f) said stool being biased to a stop position on said rocker,

(g) said stool having a lever-supporting face and said axes. being oiset in opposite directions from a line normal to said face at its point of lever support,

(It) said face being sloped to rise relative to the lever fulcrum point on movement of the stool away from its stop position about said iirst axis and torecede relative thereto on movement of the stool and rocker in the saine direction about said second axis, whereby the lever force on said face tends to bias said stool toward its stop position and to bias said rocker and stool assembly toward movement in said direction away from lever-supporting position,

(i) and means for releasabiy maintaining said rocker in its lever-supporting position.

9. A device for operating a valve as defined in claim 8, in which (a) said face lies in'an arc about a point between said fjrst and second axes.

l0. A device for operating a valve, comprising,

(a) an operating member movable between rst and second positions and biased to its said second position,

(13) a lever pivotally interconnected at an operating point with said operating member and having a fulcrurn point spaced from said operating point,

(c) an actuating member interconnected with said lever at an actuating point spaced from said operating and fulcrum points,

(d) said actuating member being operable, in the absence of support for said fulcrum point, to swing said lever about its operating point, to carry its fulcrum point in an arcuate path thereabout, the operating point being positioned by the operating member in its said second position,

(e) a fulcrum support comprising a rocker member mounted on a fared pivot axis outside said arcuate path, and a fnlcrum stool pivotally mounted on said rocker member and biased toward said path to a stop position on said rocker,

(f) said rocker having an operative position in which it disposes said stool generally tangent to said arcuate path and with a portion thereof in said path to support the lever iulcrum point in fulcrum position,

(g) said actuating member, in the presence of said lever tulcrum support, being operable to move said operating member to its said iirst position,

(lz) said rocker being unstable in said operative position and tending, under lever force, to move to an inoperative position in which it disposes said stool portion outside the arcuate path of said ulcrum point,

(i) and electromagnetic means which in energized state exerts traction to move said rocker to and retain the same in its operative position,

(j) said stool being yieldingly retractable about its pivot axis on said rocker to pass said lever fulcrum point to ulcrurn position.

References Cited in the tile of this patent UNITED STATES PATENTS 2,301,876 Hurlburt Nov. l0, 1942 2,839,929 Hurlburt June 24, 1958 2,875,616 Marks Mar. 3, 1959

Claims (1)

1. A DEVICE FOR OPERATING A VALVE, COMPRISING (A) AN OPERATING MEMBER MOVABLE BETWEEN FIRST AND SECOND POSITIONS AND BIASED TO ITS SAID SECOND POSITION, (B) A LEVER PIVOTALLY INTERCONNECTED AT AN OPERATING POINT WITH SAID OPERATING MEMBER AND HAVING A FULCRUM POINT SPACED FROM SAID OPERATING POINT, (C) AN ACTUATING MEMBER INTERCONNECTED WITH SAID LEVER AT AN ACTUATING POINT SPACED FROM SAID OPERATING AND FULCRUM POINTS, (D) SAID ACTUATING MEMBER BEING OPERABLE, IN THE PRESENCE OF SUPPORT FOR SAID FULCRUM POINT, TO PIVOT SAID LEVER THEREABOUT FOR MOVING SAID OPERATING MEMBER TO ITS SAID FIRST POSITION, AND IN THE ABSENCE OF SUCH SUPPORT, TO SWING SAID LEVER ABOUT ITS OPERATING POINT OF INTERCONNECTION WITH SAID ACTUATING MEMBER, (E) A FULCRUM SUPPORT HAVING A LEVER-SUPPORTING POSITION IN WHICH THE FULCRUM POINT OF SAID LEVER IS SUPPORTED THEREON AND EXERTS THEREON A FORCE IN A PREDETERMINED LINE, (F) MEANS FOR MOUNTING SAID FULCRUM SUPPORT ON A FIXED AXIS TRANSVERSE TO SAID LINE, (G) SAID FULCRUM SUPPORT BEING MOVABLE ABOUT SAID AXIS, IN A PREDETERMINED DIRECTION RELATIVE TO SAID LINE, TO A NON-SUPPORTING POSITION CLEAR OF SAID LEVER, (H) SAID FIXED AXIS BEING SPACED A RELATIVELY SUBSTANTIAL DISTANCE ALONG SAID PREDETERMINED LINE FROM SAID FULCRUM POINT AND BEING OFFSET A RELATIVELY SMALL DISTANCE FROM SAID LINE IN A DIRECTION OPPOSITE TO SAID DIRECTION OF FULCRUM SUPPORT MOVEMENT, THE POSITION OF SAID FIXED AXIS BEING SUCH THAT THE LEVER FORCE ON THE FULCRUM SUPPORT HAS A RELATIVELY LARGE MAJOR COMPONENT IN THE DIRECTION OF SAID FIXED PIVOT AXIS FOR TRANSMITTING SUBSTANTIALLY THE ENTIRE LEVER FORCE DIRECTLY TO SAID FIXED AXIS AND HAS A RELATIVELY SMALL MINOR COMPONENT IN SAID PREDETERMINED DIRECTION TENDING TO PIVOT SAID FULCRUM SUPPORT FROM ITS LEVERSUPPORTING POSITION TO ITS LEVER-CLEARING POSITION, (I) AND ELECTROMAGNETIC MEANS OPERATIVELY CONNECTED TO SAID FULCRUM SUPPORT AND OPERABLE, WHEN ENERGIZED, TO RETAIN SAID FULCRUM SUPPORT IN ITS SAID LEVER-SUPPORTING POSITION.

Images