US3183973A

US3183973A - Pitless well connector

Info

Publication number: US3183973A
Application number: US345554A
Authority: US
Inventors: Henry B Eging
Original assignee: Individual
Current assignee: Individual
Priority date: 1964-02-12
Filing date: 1964-02-12
Publication date: 1965-05-18
Anticipated expiration: 1982-05-18

Description

May 18, 1965 H. B. EGING PI'ILEssA WELL CONNECTOR Sheets-Sheet l Filed Feb. A12, 1964 INVENTOR.

May 18V, 1965 H. B. EGING 3,133,973

PITLEss WELL CONNECTOR Filed Feb. 12. 1964 2 Sheets-Sheet 2 'l/llilllln FI G- 5 l 1 VENToR.

` the well pipe to lateral service pipe lines.

United States Patent 3,183,973 PITLESS WELL CONNECTR Henry B. Eging, 11565 Chillicothe Road, Box 35, Chesterland, Ohio Filed Feb. 12, 1964, Ser. No. 345,554 8 Claims. (Cl. 166-85) This application is a continuation-in-part of my copending application Serial No. 126,164 filed July 24, 1961, and now abandoned.

This invention relates to pitless well pipeline adapters for offset installations which are primarily used to effec-t lateral discharge of water from an encased well and where the pipeline connect-ions are made from within the encased well to underground service pipe lines leading away from the well casing below the frost line.

When converting a hand-pumped water well into a mechanically-pumped Well, it becomes necessary in most instances to provide means to discharge water laterally below the frost line. In the past, it was common practice to provide a concrete pit or heated well house around the well casing to prevent freezing. A pitless well adapter eliminates the need for the concrete pit or heated well house. The improved pitless well adapter of this invention providesa better and more simplified cooperative relation between the adapter body, the well casing, and the lateral service pipe lines than prior adapters.

Although considerable simplification has been made recently in the design of pitless well adapters, the prior pitless units still have many disadvantages. For example, some prior pitless well adapters have tapered fittings as a sealing means between mating members for connecting The tapered fittings often become diiiicult to separate for repair or inspection due to chemical changes or deposits of foreign matter released from the well water.

Further, some prior pitless well adapters rely on O rings as the sealing means. Discrepancies in machining, misalignment, or damaged surfaces often cause defective sealing when rings are used.

Some pitless well adapters use a sleeve or the combination of a sleeve and tapered fittings. The connections of these are obscure to the operator and good alignment is therefore not always assured.

In the mechanical wedge type of pitless well adapter, the parts are wedged into sealing position and one of the joints serves as a support means for the pitless unit. Installations of this kind vary in sealing pressure directly with the weight of the pipe line assemblies. For instance, in some the lower area of the mating surfaces carries all of the weight of the pipe line assembly while the opposed upper area of the mating surface carries none. Variable and non-uniform sealing is the result.

Some prior adapters require that the well casing terminate below the frost line and be threaded to receive a coupling for a special standpipe which extends above ground level and houses the pitless well adapter. This type of construction'is extremely expensive to build and expensive -to install.

Accordingly, it is an object of this invention to provide a new and improved pitless well adapter not having the foregoing disadvantages.

Another object is to provide a pitless well adapter having a top support member that rests on top of a well casing thereby to carry all of the weight of the adapter at all times regardless of its position in the well casing. Another object is to provide appitless well adapter in 'which all of the force imposed upon its sealing member is used for making sealing connections between the adapter body Yand lateral pipe lines' with no sliding or wedging action.

Another object is to provide a pitless well adapter having a sealing means that provides only two functions in its cycle of operation, viz, in the first portion of its cycle it functions only to close the connections between the adapter body and the lateral pipe lines and in the second portion it functions only to open the connections.

Another object is to provide a pitless well adapter having a sealing member that opens with a snap action during the start of its opening cycle of operation.

A further object is to provide a pitless Well adapter having a mechanical means manipulated from the upper end of a well casing which functions only to drive a sealing means through its cycle of operation.

Another object is to provide a pitless well adapter which can be lifted out of a well casing as a unit leaving the full diameter of the casing free for access to the well.

Another object is to provide a pitless well adapter having its sealing area outside the well casing thereby eliminating all possible damage to the sealing area by drill tools or the like.

Another object is to provide a pitless well adapter which easily slips into sealing engagement when in aligned position without requiring the use of a ashlight.

Another object is to provide an improved pitless well adapter that readily lends itself to the measuring of the pressure applied to the sealing areas.

A further object is to provide a pitless well adapter utilizing a flat gasket of liexible material in the space between the adapter body and the lateral pipe lines.

Other objects and advantages will become apparent from the following description of the invention wherein reference is made to the drawings, in which:

FIG. 1 is a fragmentary elevational view through the upper end portion of a well casing showing an adapter in accordance with. this invention installed and in its locked and sealed position;

FIG. 2 is a top plan view of FIG. 1 with the casing cap removed;

FIG. 3 isa fragmentary elevational View similar to FIG. 1 showing the adapter body disengaged and backed away from its sealed position;

FIG. 4 is a horizontal sectional view taken generally along the line 4 4 of FIG. 3;

FIG. 5 is a fragmentary elevational view of the upper portion of the adapter when in the position of FIG. 3;

FIG. 6 is an exploded view, partially in section, showijrg a clamping fixture and a saddle positioned for assem- FIG. 7 is a View similar to FIG. 6 taken at right angles thereto;

FIG. 8 is a perspective view of a gasket;

FIG. 9 is an elevational view of the adapter body; and

FIG. 10 is a View similar to FIG. l of a modified form of the invention.

Referring principally to FIG. 1, a well casing 10 extends into the ground to a depth needed to provide a safe Water reservoir and its upper end portion extends above the ground level at least ten inches for sanitary reasons or a distance required by the local building code governing pitless well installations. At the time of installing the pumping equipment, a trench is dug below the frost line to the well casing 10 to allow lateral service pipe lines 11 and 12 to lie at a safe depth to prevent freezing and for connection to a pair of

lateral pipe lines

14 and 15 of the pitless well adapter of this invention.

As shown in FIGS. 1, 3, and 9, a pitless well adapter in accordance with this -invention compnises a body portion 16 made up of a pair of similar pipe lines 18 and -19 joined together by a lower web portion 20 such as can be produced by a conventional casting process and having respective downwardly directed openings or holes in their enlarged

lower portions

21 and 22 tapped with standard pipe threads into which may be threaded the Patented May 18, 1965 sesame upper end portions of respective pipe lines 24 and 25. The pipe lines 19 and 1S extend upwardly, are offset toward each other as shown most clearly in FG. 9, and then turn laterally one above the other and terminate in respective lateral projections or

bosses

26 and 28 having

end faces

29 and 30 formed to define convex outer face surfaces conforming with the outer surface of the well casing 10.

As shown most clearly in FIG. 3, a pair of

openings

31 and 32 in the well casing 1@ are slightly larger than the

projections

26 and 28 of the

pipe lines

18 and 19 and are complementary thereto, respectively, allowing the

projections

26 and 28 to protrude therethrough with ample clearance for ease of assembly.V

A support plate 34 rests upon and is supported by an upper edge 35 of the well casing 10 and carries the weight of the pitless well adapter at all times regardless of its position in the well casing 1@ or the engagement or disengagement of the

projetcions

26 and 28 with the

lateral pipe lines

14 and 15. A T pull out handle arrangement is provided and, for this purpose, a rod or pipe 36 which serves as a handle'is welded as at 38 to the platei and depends therefrom. The lower end of theY rod or handle 36 slips into a complementary hole formed in a boss 39 of the body portion 16 and is removably secured therein by a pin received in a hole 4t).

Holes

46, 41, 42, etc. in the handle 36 are pre-punched or pre-drilled at right angles to the longer axis of the plate 34 and at accurately spaced distances therefrom to facilitate iield installation of the adapter` Thus an adapter taken from stock may be modified in the field by cutting through the handle 36 at selected places to accommodate different depths of the lateral service pipe lines 11 and 12. This also facilitates the eslection of spare parts. Alternatively, the lower end of the handle 36 may be rigidly attached to the top of the boss 39 by welding or the like.

A slot 44 in the upper end portion ofthe handle 36 above the plate 3S receives the ulcrum end of a lever 45 which is pivotally connected to the handle 36 by a pivot pin a6. A pushpull rod 43 is in parallel spacedrrelation to the handle 36 and is slidably received in a bearing hole 34a in the support plate 34 and is limited in its upward movement by a cotten pin 49 striking the lower tace of the plate 34. A closed slot in the upper endrportion of the push-pull rod 4? slidably receives the central portion of the lever 45. An outer end portion 51 of the lever is within the peripheral limits of the well casing 1t) and has its outer end portion shaped to accommodate Ian ordinary standard pipe, shown in phantom, in telescoping relation as a handle to provide additional leverage for moving the rod i8 up and down. As will be explained, movement of the rod 43 downwardly moves the body portion 16 into sealing engagement with the

lateral pipe lines

14 and 15 and movement of the rod 4S upwardly moves the body portion 16 out of sealing engagement.

The lower end portion of the push-pull rod 48 projects downwardly through an elongated hole 52 in a lateral projection or post 53 of the adapter body 16 opposite the

bosses

26 and 28. Hinged to the lower end portion of theV rod 48 just above the post 53 is a pair of opposed

U-shaped arms

54 and 55 having their free ends straddling the rod 48 to whichV they are hinged by a cornmon hinge pin 56.

Inner edge portions

54a and 55a of the web or bight portions of the arms S4 and 55 are positioned a predetermined distance from the pin 56 to provide, by striking the rod 48, an angular limitation in the down or closed positions of the arms S4 and 55, as shown in FIG. l, and an angular limitation in their up or opened position, as shown in FIG. 3. The elongation of the hole 52 provides clearance needed to accommodate a lateral movement of the adapterV body 16 between closed and opened positions, as will become apparent. As shown in FIG. 1, end faces Sab' and SSb of the

arms

54 and 55 serve to push the body portion 16 into sealing engagement with the lateral pipe lines 14 and 1S by moving laterally out- Wardly in opposite directions from the rod 48 with the end face b bearing against the inner wall of the well casing 10 and the end face db bearing against a vertical surface or pad 58 of the body 16 when the hinged inner end portions of the

arms

54 and 55 are subjected to pressure through the push-pull rod 4S provided by downward force applied manually to the lever 45. It should be noted that the sealing pressure exerted against the pad 53 of the adapter body 16 to seal the connections between the adapter body 16 and the

lateral pipe lines

14 and 15 is in direct proportion to the force applied to the lever d5 prior torsnap locking itself into sealed engagement.

Mounted on the upper surface of the post 53 and forming therewith a guide means for the

arms

54 and 55, is a pair of resilient bumpers 59 and 60, preferably made of soft rubber or the like, to take up angular movement of the arms S4 and S5 after the outer end face 55b has struck the inner surface of the well casing 1t) and the outer end face 5ft-b has engaged theKpad'SS of the adapter body 16 and until the pin 56 moves through dead center and into self-locking position, whereuponthe inner hinged portions of the

arms

54 and 55 come to rest against the post 53 of the guide means between the bumpers 59 and 69. When the outer end faces 54h and 55b strike the adapter pad 53 and the innerV face of the well casing 10, respectively, their point of contact is substantially maintained although further downward movement of the hinged inner portions'of the

arms

54 and 55 continues through the dead center position and into a self-locking position, shown in FIG. l, by the flexing of the resilient bumpers 59 and 6).

Mounted on the exterior surface of the well casing 10 is a saddle 61 comprising a suitable perforated arcuate plate 62 with the lateral pipe lines or

nipples

14 and 15 attached thereto as by welding.

A gasket 6d (FIG. 8) has spaced openings 65 and 66 concentric with

lateral pipe lines

14 and 15, respectively, and is compressed between the inner concave surface of the arcuate plate 62 and the outer surface of the well casing 1t). The amount of compression of the gasket 64 is limited by the predetermined length of

ianges

67 and 68 of the arcuate plate 62 which abut `against the outer surface of the well casing 10'. Y

A third hole@ inthe gasket 64 slips over a dowel pin 7) which is secured to the plate 62 as by welding at '71 and facilitates assembly of the saddle 61 on the well casing 10.

A hole 72 (PEG. 6) in the well casing 1G is drilled midway between the

holes

31 and 32 and receives the dowel pin 70. The plate 62 is drawn up tightly by external means against the well casing 10 and is then permanently secured in position by tack welding at '74, 74a, 74h, and 74C.

A fuller understanding of the invention will be had from the following description of the normal installation procedure.

After determining the depth needed for the lateral service pipe lines 11 and 12 and the digging of a suitable trench, the top of the well casing 1t) is cut olf squarely at the desired level above ground. Y The

holes

31, 32, and '72 are then drilled into the well casing preferably by using a simple drill jig.

The proper length of the handle 36 and the push-pull rod 48 is then selected, and if necessary, each is cut olf at appropriate markings below a selected one of the holes 4t), 41, or 42 in the case of the handle 36 or holes such as 75 or '76.for the pivot pin 56 in the case of the rod 48. The handle 36 and the rod 4S are then assembled with the adapter body 16.

The assembled unit is then lowered into the well casing 1t) with the lever 4S in its uppermost position until the support plate 34 rests on the edge 35 of the well casing 10. By turning the plate 34, the adapter body 16 can be rotated to insure alignment of the

projections

26 and 28 with the

holes

31 and 32, respectively. The lever 45 is then lowered to determine the amount that the

projections

26 and 28 extend through the

openings

31 and 32. If this is not enough to insure proper compression of the gasket 64, one or more shims 7'7 are either added or removed from the adapter pad 58. When the proper position is attained, saw cuts 78, 78a, 78b and 78C are made in the top edge 35 flush with the sides 34a and 34b of the support plate 34 for accurate relocation of the assembled adapter.

To withdraw the assembled adapter from the casing 10, the lever 45 is raised and the assembly lifted by the plate 34. To reinsert the assembled adapter, the lever 45 is maintained in its raised position and the plate 34 is used for lowering. With alignment properly made, the assembled adapter will come to rest in a substantial vertical position with the

projections

26 and 28 entering the

openings

31 and 32 due to gravity. The lever 45 may then be released to allow the weight of the lever 45 and the pushpull rod 48 to partially spread out the

arms

54 and 55.

If the assembled adapter is not properly aligned in the casing 10, the

projections

26 and 28 strike the inside surface of the casing thereby preventing lowering of the lever 45. The installer is thus made aware of the misalignment and can correct it.

The assembled unit may then be withdrawn to permit installation of the clamping fixture and the saddle 61. Referring principally to FIG. 6, the clamping xture comprises a clamp plate Si) and a cylindrical rod 81 which rod extends through an opening in a flat bar 83. The rod 81 rests on the edge 35 with the bar 83 extending into the casing 1) and spaced

bolts

34 and 85 extending outwardly from the bar 83 are passed through the

respective openings

31 and 32. Preferably, the

bolts

84 and 85 are secured to the bar S3 by welding. The saddle 61 may now lbe moved into position over the

bolts

84 and 85 and against the outer surface of the casing 10 with the dowel pin 70 entering the hole 69 in the gasket 64 and the hole 72 in the casing 10. The clamp plate 80 is then positioned on the outer ends of the

bolts

84 and 85 and the nuts 86 and 87 tightened.

Tightening of the nuts'84 and 85 against the clamp plate 80 compresses the gasket 64 between the plate 62 and the outer wall of the casing it) to an extent limited by the

flanges

67 and 68. The plate 62 is then tack welded to the casing 10 at 74, 74a, 74b, and 74C. The nuts 86 and S7 may now be backed oir the bolt-

s

84 and 85 and the clamping fixture 80 removed.

Although I have shown a preferred form of saddle plate 62, it will be understood that a similar plate fastened to the casing 10 by U-bolt could be used.

In the modified -form of the invention shown in FIG. 10, a pitless well adapter comprises a body portion 89 of generally L shape having a downwardly directed tapped hole in a lower portion 9i) into which may be threaded the upper end of a single well pipe 91. The hole in the portion 90 communicates internally of the body portion $9 with a laterally directed opening in a lateral projection 92 having a convex outer face 93 conforming with the convex outer surface of the casing 10.

An upper boss 94 on the body portion 89 receives the handle or support rod 36 as in the principal embodiment. A boss or post 95 opposite the projection 92 carries the push-pull rod 48 and the

arms

54 and 55 for forcing the projection $2 toward a lateral pipe or nipple 96 secured to a modied arcuate plate 97 having a dowel pin 98 below the nipple 96.

The embodiment iirst described is applicable to twin pipe line installations using a jet pump while the embodiment of FIG. 10 is applicable for use with a submersible pump.

Final sealing of both embodiments will be explained by reference to FIGS. 1 and 3. With the adapter body properly positioned in the casing 10, downward pressure on the lever forces the body 16 from the position of FIG.

6 3 to the left as shown in FIG. l. The end portions of the

projections

29 and 30 have been driven through the

openings

31 and 32 in the casing 10 and have compressed the gasket around the openings 65 and 66 to provide a water tight seal.

Having thus described my invention, I claim:

l. A pitless well adapter comprising a body portion having a laterally directed opening in a lateral projection Vand a downwardly directed opening, a fluid passage in said body portion interconnecting said openings, a support plate, a rod secured to said support plate at an upper end portion and to said body portion at a lower end portion, a guide means extending outwardly from said body portion opposite said lateral projection, aligned openings in said support plate and said guide means, respectively, a push-pull rod slidably received in said aligned openings, and a pair of arms pivoted on said push-pull rod above said guide means with their free end portions resting on said guide means on opposite sides of said push-pull rod and slidable along said guide means axially thereof as said push-pull rod is reciprocated, a free end portion of one of said arms engaging and exerting lateral force against said body portion upon downward movement of sai-d push-pull rod while the free end portion of the other one of said arms moves along said guide means laterally away from said body portion, whereby said body portion is moved laterally away from said push-pull rod upon further downward movement of said push-pull rod when said sliding movement of said other arm along said guide means is arrested by an obstruction.

2. A pitless well 4adapter comprising a body portion having a laterally directed opening in a lateral projection and a downwardly directed opening, a fluid passage in said body portion interconnecting said openings, a support plate, a rod secured to said support plate at an upper end portion and tosaid body portion at a lower end portion, guide means including a post extending outward-ly from said body portion opposite said lateral projection, a reciprocative operating rod, a guiding opening in said support plate slidably receiving an upper end portion of said operating rod, an elongated opening in said post aligned generally with said guiding opening with its longer axis extending axially of said post and slidably receiving a lower end portion of said operating rod, and a pair of arms pivoted at a common point on said operating rod above Vsaid guide means with their free end portions resting on said guide means on opposite sides of said operating rod and slidable along said guide means in directions opposite to each other as said operating rod is reciprocated, a free end face of one of said arms engaging and exerting a lateral force against said body portion upon downward movement of said operating rod while the free end portion of the other of said arms moves along said guide means ylaterally away from said body portion, whereby said body portion is moved away from said operating rod upon downward movement of said operating rod when said sliding movement of said other arm along said guide means is arrested by an obstruction.

3. A pitless well adapter having a body portion proi vided with a uid passage opening at one end downwardly of the body por-tion and at the other end laterally of the body portion within a lateral projection of said body portion, a support plate, means securing the body portion in fixed position below the support plate, a guide means extending outwardly from said body portion opposite said lateral projection, aligned openings in said support plate and said guide means, respectively, .a reciprocative rod slidably lreceived within said openings, clearance space between said rod and the walls of said opening in said guide means to permit relative lateral movement between said rod and said body portion, a pair of arms pivoted on said rod above said guide means with their free end portion slidable along said guide means axially thereof as said rod is reciprocated, a free end por-tion of one of said arms engaging said body portion upon downward movement of said rod while the free end portion of the other of said arms moves .laterally along said guide means away from said body portion, whereby said body portion is moved laterally away from said rod upon further downward movemen-t of said rod when said .sliding movement of said other of said arms is arrested.

4. A pitless well adapter in accordance with claim 1 characterized in that a lever has one end portion pivoted at a pivot point above said support plate and an intermediate portion operatively engaged with said rod above said support plate for conjoint movement with said rod axially of said rod, whereby oscillating movement of a free end portion of said lever causes reclprocation of said rod.

5. A pitless well adapter in accordance with claim 1 `characterized in that said guide means comprising a post anda pair of spaced bumpers which extend upwardly from the post, the free portions of said arms are slidable on said bumpers, respectively, and the pivot point of said arms on said push-pull rod can be moved below the upper level of said bumpers thereby toL permit said arms to be moved through a fully extended position to a position in which the free end portions of said armsV are above said pivot point.

6. A pitless well adapter for use in a well lcasing having a lateral discharge opening spaced from the upper end thereof, Vsaid well adapter comprising a body portion having a downwardly directed opening for connection to a vertical pipe line within said casing and a lateral projection provided with an opening for cooperation with said discharge opening, a iluid passage in said body portion interconnecting said openings in said body portion, a support plate, an elongated rod means interconnecting said support plate and said body portion for supporting said body portion from said support plate, the length-of said rod means being such that said opening in said lateral projection is aligned with said discharge opening when said support plate is resting on the upperend of the casing, a guide means extending from the body portion opposite said lateral projection, aligned openings in said support plate and said guide means, respectively, a push-pull rod slidably received in said aligned openings, and a pair of arms pivoted on said push-pull rod above said guide means with their Afree end portions resting on said guide means and slidable therealong as said push-pull rod is reciprocated, whereby downward movement of said pushpull rod. causes said arms to extend one against the body portion and one against the well casing thereby to force said lateral projection into cooperative relation with said discharge opening.

7. A structu-re for connecting a horizontally disposed pipe outside -a well casing to a vertically disposed pipe within a Well casing, said structure comprising a well casing, a pipe coupling mounted inside the casing and having a lower lorice arranged to receive the upper end portion of the vertical pipe and communicating with an opening in a lateral extension of the coupling, an opening in said leasing for receiving said lateral extension, a coupling member having an arcuate body portion and a nipple portion extending outwardly from the convex side of said body portion, said nippleportion being adapted to be connected to said horizontal pipe, means mounting said coupling member on said casing with said arcuate body portion spaced uniformly from said casing and the inner end of said nipple portion aligned with the opening in the casing, a resi-lient gasket in the space between said arcuate body portion and the outer surface of said casing and having an opening smaller than said lateral extension and aligned with said opening in said casing wall and means operable from outside the casing for forcing said lateral extension through said opening in said casing wall into sealing engagement with said gasket around the opening in the gasket.

8. A pitless well adaptericomprising a body portion having a laterally directed openingV in a lateral projection and a downwardly directed opening, a fluid passage in said body portion interconnecting said openings, a support plate, a rod secured to said support plate at an upper end portieri and to said body portion at a ylower end portion, a guide means extending outwardly from Vsaid body portion opposite said lateral projection, aligned openings in said support plate and said guide means, respectively, a push-pull rod slidably received in said aligned openings, and a pair of arms pivoted on said push-pull rod above said guide means, means causing the free end portions of said arms to move outwardly in opposite directions from said rod as said rod is moved downwardly, a free end portion of one of si-ad arms engaging and exerting lateral force against said body portion upon downward movenient of said push-pull rod while the free end portion of the other one of said arms moves laterally away from said body portion, whereby saidrbody por-tion is moved laterally away from said push-pull rod upon further downward movement of said push-pull rod when said movement of the free end portion of said other arm is arrested by an obstruction.

Reerences Cited bythe Examiner `UNITED STATES lPATENTS 2,689,611 9/54 Martinson 16d-85 2,851,106 9/58 Dicken 16S-S8 2,859,824 l1/58 Fischer 166-88 2,946,385 7/60 Dicken l66-75 XR 2,998,847 9/61 Maass 166-85 CHARLES E. OCONNELL, Primary Examiner.

Claims

8. A PITLESS WELL ADAPTER COMPRISING A BODY PORTION HAVING A LATERALLY DIRECTED OPENING IN A LATERAL PROJECTION AND A DOWNWARDLY DIRECTED OPENING, A FLUID PASSAGE IN SAID BODY PORTION INTERCONNECTING SAID OPENINGS, A SUPPORT PLATE, A ROD SECURED TO SAID SUPPORT PLATE AT AN UPPER END PORTION AND TO SAID BODY PORTION AT A LOWER END PORTION, A GUIDE MEANS EXTENDING OUTWARDLY FROM SAID BODY PORTION OPPOSITE SAID LATERAL PROJECTION, ALIGNED OPENINGS IN SAID SUPPORT PLATE AND SAID GUIDE MEANS, RESPECTIVELY, A PUSH-PULL ROD SLIDABLY RECEIVED IN SAID ALIGNED OPENINGS, AND A PAIR OF ARMS PIVOTED ON SAID PUSH-PULL ROD ABOVE SAID GUIDE MEANS, MEANS CAUSING THE FREE END PORTIONS OF SAID ARMS TO MOVE OUTWARDLY IN OPPOSITE DIRECTIONS FROM SAID ROD AS SAID ROD IS MOVED DOWNWARDLY, A FREE END PORTION OF ONE OF SAID ARMS ENGAGING AND EXERTING LATERAL FORCE AGAINST SAID BODY PORTION UPON DOWNWARD MOVEMENT OF SAID PUSH-PULL ROD WHILE THE FREE END PORTION OF THE OTHER ONE OF SAID ARMS MOVES LATERALLY AWAY FROM SAID BODY PORTIONN, WHEREBY SAID BODY PORTION IS MOVED LATERALLY AWAY FROM SAID PUSH-PULL ROD UPON FURTHER DOWNWARD MOVEMENT OF SAID PUSH-PULL ROD WHEN SAID MOVEMENT OF THE FREE END PORTION OF SAID OTHER ARM IS ARRESTED BY AN OBSTRUCTION.