Патент USA US2408182код для вставки
Sept 24, 19467»- ‘_w. slMoN’roN I 2,408,181 v LIFTING MEcHANlsM; FiiedJan. 22, 1942 v' noël" ,,. In», \\ „W ,Ww w, , Patented Sept. `24, 11946 ~ 2,408,181 UNITED ‘s'rATl-:s` ,PATE-_NT OFFICE William L. Simonton, Dayton, Ohio, assigner to. ,y Y The Joyce-Cridland Company, Dayton, Ohio, a n v , corporation of ' Ohio Application January 2z, 1942, serial No. 427,717 9 Claims. l. This invention relates ’to ïnf'ting lmeehamends,' 9 rigidly Ysecured thereto and has mounted with in thesame abushing '_lß to form a bearing for the ram.“ Asy here shown, this bushing is screw threaded into the upper end of the body 6, as shown at l l, and is provided with an annular pro and more particularly to meansfor positively locking the lifting element in an v.elevated load supporting position. `In hydraulic lifts it has been customary heretofore to retain the lifting. A jection or' flange-I2 which overhangs the upper . element, or ram, in an elevated position by clos edges'of the body portion 6 and the sleeve 9. The ing the cutoff valve to prevent the escape of oil d mainlifting element or ram I3 is mounted in or other iìuid from the cylinder, andinthe event vthe bearing [.0 for vertical movement within the of the escape of fluid from the cylinder, due to a leaky valve or otherwise, the ram and the load 10 cylinder. ' It is of a diameter somewhat less than thereon will move downwardly. Y the'int'ernal diameter of the cylinder and is pro ,Y One object of the invention is to provide means vided at its lower vend with an> enlargement I4 for positively retaining the ramv in its elevated iìtting snugly within the body portion of the cyl inder- and constituting in eifect a piston head.The ram'in the Vpresent instance is tubular in position. „ . c ` A further object of the inventionis to provide -a positiveV lock for the _ram which willv automati forni and is closed at its lower end by a bottom wall l5. KïAtits upper end the ram has mounted therein a bushing I6 having an internal thread ' cally lock the same against downward movement immediately upon; a decrease inthe supporting pressure. ' to receive and adjustably support a supplemental] ' A further object of the invention is toprovide 20 lifting element/Il'which is provided at its upper Y end-With awork engagingmember I8 and is held a locking device which Willbe in locking position ._ in adjusted positions by a locking nut I9. The ram is provided in -its external surface with at all times during the elevation of the rambut will permit the ram to move upwardly with rela tion thereto.` ' ~ l . e a spiral" groove 2U which preferably extends for A further object of the invention is to provide 25 substantially tneffull lengtn of the ram above the such a locking device which may be moved to and piston head IA’and forms on the rama spiral rib, retained in a position near the upper end ofthe which,” _in ¿the present instance, y is of _a Width e . greaterthan the width of the groove. The ram ram to permit the latter to movedownwar'dly. is heldv against rotation >in the cylinder and for Otherobjects of the invention may appear as Y the mechanism is described in detail. ` In the accompanying drawing Fig. iis a verti 30 cal section taken centrally through a lifting mechanism equipped -with my invention, partly piston head |4'to the upper end of the ram. A spline'22 rigidly mounted .Within the upper end broken away, and showing the ram partly in ele-V vation; Fig. 2 is aV section taken on the line 2-2 of Fig. 1; Fig. 3 is a vertical section taken cen trally through the locking device; >and Fig. 4 -is a detail view, partly in section, of another form this‘purpose is,- >in tne'present instance, provided with a vertical groove 2| ‘which extends from the 35 of thecylinder extends into the groove 2| and thus" preventsuthe rotation of the ram without`V interfering with its vertical movement. As here shown,A thespline is seated in a groove in the bear ing bushing I0 and is rigidly secured therein by screws 23 extending through the sleeve 9, ,body of retaining device. . « . In the drawing I have illustrated one embodi 40 portion jl!) and> bushing, and thus serving to rig idly lock the ‘bushing Aagainst rotation as well as ment of my invention and have shown the same as applied to a hydraulic vehicle lift of a well to support the spline in the groove 2 l. . Rotatably known type which is designed primarily for use with airplanes, and when used for that purpose two orV more lifts, or jacks, are usually employed. supported _on the cylinder is a locking device 24 It will be understood, however, that the invention may take various forms and may be utilized in connection with lifting mechanisms, orjaeks, of having a‘ part extending into the spiral groove 20 of the ram and- havingjsliding engagement with the lower wall` of that groove, so that as the ram moves upward'lythe locking device will be caused 1 by gravity to follow downwardly along the groove Á and to thus rotate about the ramV in contact with , e n As here shown, the lifting mechanism com k50 or close to the‘cylinder. When fluid escapes from prises a »cylinder 5 which consists of a tubular> » the cylinder or the Asupporting pressurek on the body portion 6 closed at its lower end by a cap ram otherwise relieved the upper wall of the llke structure 'I rigidly secured thereto and pro-V groove 20 will engage the locking device, in what ever position it may then occupy, and the ram v_lded with a fluid inlet 8. At its upper` end .the various kinds. body portion _6 is reinforced by an external sleeve will'be thus locked'against downward movement. - 2,408,181 4 3 Preferably the locking device 24 comprises an annular element extending about the ram and the ram and maintaining the projection or rib 25 always in a locking position with relation to normally supported on the flange l2 of the bush ing IB, this ñange forming the top surface of the the ram. When the ram has been elevated to the desired height the usual cutoff valve is closed to maintain a continuing support for the ram but should there be any leakage of fluid from the cylinderor shouldthe iiuid pressure be otherwise decreasedt'the tendency of the ram to move down these spiral ribs each extending for approximate wardly under its load will cause the upper wall ly one-half of a convolution, due to the relative 10 of .the spiral groove to engage the rib of the ly narrow width of the annular member. The~ locking device and will create such frictional contact between the upper wall of the groove and lower edge of each rib 25 is chamfered so that-it has free sliding contact with the lower wall of the the rib and Abetweenthe locking device and the groove 2i) as the ram is moved upwardly l-andthe" upperjendof the i cylinder as to prevent the cylinder. This annular member is provided on its inner surface with an inclined or spiral rib 25 which is parallel with and extends into the spiral groove 20. There are preferably two of f locking device will therefore follow-downfalongu- 15 rotation ,of .thejilocking device and thereby lock the groove and will remain in contact with or theram against downward movement, this lock ing Operation;.takingqeiïect instantly upon the close to the upper end of the cylinder. Whenthe ram tends to move downwardly the upper surface of the spiral groove will be brought into contact;l ï with rib or ribs 25 and the .frictional contact be 20 tween the .rib> andthe >wall of thegroove-_and-be-'~ .Y tweentheannular Ymernîber. _and the-¿upper/end of y the .cylinder will prevent the rotation _of thelock relief of the supporting pressure on the ram. When the ram is to be lowered and While it is supported by the ñuid within the cylinder the locking-device or follower nut is run` upward on the 1 yramÁ to a- position» spaced-from- the « upper» end'of the'cylinder» a distance sufficient to per-~ mit the ram-to be lowered, and is retained -in that ing. deviceand. it will therefore positively lock _. the ram .against downward_movement._ To in» 25 position »by the retaining device 21 or 33. -1 v'Should crease the ffrictional contact _ between- the locking , device 25 of the and locking the ram,_the .device isuppersurfaceof chamfered andthe therib upf ..1 perwall of the~ groove-20 is chamfelîedas _s_hown,g_ at 26.. ÃïI‘heangularityof thechamfered.surfaces` beingsuchas to provide a relatively..great.i1`ic_-¿_ tional contactbetween the` same. \¿ When the. ram is to be lowered the. locking. cle-__ » vice ,24 is moved to a-positionnear. the .upper-.end_¿~ _ of the rain,` by manually _rotatingthesame _about _ theram, and is retained _in that positionto per-_v mitthe ¿rain to be lowered. _Any suitable__means_ maybe .provided for> retaining thelocking device _- K in a position -nearthe uppeijendof theramand. ,. spaced _from the. upper .end_-of thecy1inder,.bi1t,z. 40 as shown. in Figs._1 to _3, a. diskll .is pivota11y.„. mounted in a recess inthe :upperedgeof the ,an-_ _ nularmemher. '.29 .onen ecßentrícaxís by means.. of a. pivot nin 28,-s0 ,that the. dîslsfcanrol'mellv be supportedoutlet Contact with the `.ramfrlßut may, Y be moved about. .its-axis .11.1110 thespîral. groeve 29v to support the locking device on the ram in spaced relation _to the cylinder. -The disk, is of relatively thin-,flat construction andwhen inserted in the '_ groove willso engage thewalls thereof as to pre vent >the vlocking device moving downwardly by. 5,0 gravity, Preferablyy a detent `is provided to re-_ . tain the 'eccentricallylmounted diskin the posi tion to which it has been movedand, as herel shown, a'spring pressed ball .29 is mounted in a recessßll'in the anular mem'ber 24 and the disk 21 is’pr'ovided lwith. spaced recesses 3| to receive the detent and yieldabily resist the movement of ` the'li-ft‘be or horizontal'pos/ition, used, »merely‘as in which a jack,Y the annular in an inclined mem-l ber `or followerevnut -would not be retained» by Y' gravity in ya position close to the cylinder," the nutfmayof course be «moved» to »locking position>>-` with relation to the cylinder-in any suitable man-A ner, as by hand. While I have shown and-described one Í»embodiment of my invention I wish it to be »un- ~ derstood -that I do not'desire to be limited to the' details >thereofas various-'modifications may oc cur toa'person skilled' in the art.y ~ Having now fully'ïdescribed ymy invention, what I claim as new and desire to secure _by Letters Patent is:` Y ' -1. A mechanism' comprisingy an upright tubu- ‘_ lar element, `>angelongateY yelement mounted for _ verticalmovement-in and `projecting beyond the '_ upper _end of said tubular velement _and having an ~ exterior ¿spiralv groove, and a locking memberv extending ¿about the projecting'portion of said elongategelement and vhaving va partextending into said- spiral >groove to cause said locking mem ber to rotate aboutsaìd elongate element under the influence of gravity as said _elongate element moves Aupwardlytwith- relation-to said _tubular ele ment-and to be pressedV into> locking relation to said tubular V'element by a downward force exe> ertedv thereon by said elongate element._ _ „ 2. A mechanismcomprising an vupright tubu- , lar elementfan elongate’element mounted. for. vertical movement-in and-projecting beyond :the upperA end of said tubular element and having an‘exterior spiral groove, and an annular mem In Fig. Í4 there is shown a modified formof de vice for retaining the follower. nut in its elevated 60 ber rotatable-aboutthe projecting portion of said A elongatev element- and normally _held by gravita-y position, this device comprising a set screw ex the disk. tending through the nutand adapted to engage tionf'substan-tially contact-l with an vupwardly facìng'surface of said'tubular element, said- an the ram. As here shown,»the set screw, 33, is nular 4member -having apart extendingr into said> mounted in the nut 24a in an inclined position spiral '-groove; to »slidably engage theV lower sur-H 65 and the-inner end of the nut may be caused face thereof-_A and cause _said annular member to either'to enter the groove in the ram or to en- . gage the outer surface of the spiral rib', . rotate in Contact about-said with `said elongatemernber surface of said substantially tubular ele-_W ment as said elongate element moves'upwardlyVH is admitted to the lower end of the cylinder the ram will be forced upwardly but will beheld 70 and'to Jbe *"engagedrby the -upper surface of said» groove-»and press said annulary memberinto ro- ' against rotation and the locking device; which tationl preventing engagement >with' -said~ tubular f' » constitutes a follower nut, will move downward It will _be apparent therefore that .when fluid ly along the spiral groove *andI remain in con- ~ elementV when- said- elongate ¿element «tends -to ' tact with or close to the upperend of the »cyl- movedownward; " inder; thus permitting the Aupward movement-of \- 3. InaY mechanismA com-prisingan-upright 'tu-á 2,408,181 6 felongate'element and held by gravity substan bular Aelement and an elongate element; mounted tially in contact with a ñxed part of said tubu for.k longitudinal movement> in saidvtubular .ele ment îand heldl against rotation, said elongate lar element, said elongate element and said annu element'having aspiral groove, an vannular mem lar member having interengaging spiral parts to ber extending-"about said _elongate element, sup cause said annular member to rotate about said ported Vnormally .by said tubular element land elongate element in close proximity to said fixed having aipart extending into said spiral groove, partof said tubular element as said elongate said part being adapted to engage the upper wall element moves upwardly and to be moved into of said groove and to be pressed into rotation rotation preventing engagement with said ñxed preventing engagement with said tubular element 10 part when said elongate element tends to move downwardly. when said elongate element tends to move down wardly and tothus lock said elongate element 7. In a jack device of the class described, in against such downward movement, and to slide combination, a supporting member, a ram mem along the lower wall of said groove and rotate ber associated therewith for raising and lower said annular element as said elongate element 15 ing movements vertically relative thereto, means moves upwardly, said annular member tending for preventing rotation of said ram member rela to move by gravity toward said tubular element, tive to said supporting member while permitting said annular member being movable lengthwise said raising and lowering movements of said ram of said elongate element to a positionl spaced member relative to said supporting member, a from said tubular element to permit the down 20 lock member associated with said ram member for rotation relative thereto about a substantially ward movement of said elongate element, and a device carried by said annular member and mov vertical axis, said ram member and said lock able into engagement with said elongate element to retain said annular member in said spaced member having parts including cooperating heli position. , 4. In a mechanism comprising an upright tubu lar element and an elongate element mounted for longitudinal movement in said tubular ele cal surfaces whose helix angle is such that, upon 25 raising movement of said ram member relative to said supporting member, the weight of the lock member will cause rotational movement of said lock member downward by gravity relative to ment and held against rotation, said elongate the ram member until the lock-member engages element having a spiral groove, an annular mem 30 the supporting member, said lock member being ber extending about said elongate element, sup- , cooperable with said supporting member to pre ported normally by said tubular element and ~ vent rotation of said lock member relative to said having a part extending into said spiral groove, supporting member upon such engagement,y said part being adapted to engage the upper wall whereby to prevent unauthorized lowering move of said groove and to be pressed into rotation 35 ment of the ram member relative to the support preventing engagement with said tubular element ing member upon such engagement. when said elongate element tends to move down 8. In a jack device of the class described, in wardly and to thus lock said elongate element combination, a supporting member, a rammem against such downward movement, and yto slide berassociated therewith for lifting and lower along the lower wall of said groove and rotate' 40 ing movements relative thereto, a lock member said annular member as said elongate element associated with said ram member for rotation moves upwardly, said annular member tending to relative thereto about a substantially vertical move by gravity- toward said tubular element, axis, said ram member and said lock member said annular member being movable lengthwise having parts including cooperating helical sur vof said elongate element to a position spaced 45 faces whose helix angle is such that, upon lift from said tubular element and a substantially ing movement of said ram member relative to ñat element mounted on said annular member in said supporting member, the weight of the lock a plane intersecting said lelongate element and member will cause rotational movement of said movable into said groove to retain said annularY . lock member downward by gravity relative to member in said spaced position. ~ 50V the ram member until the look member engages 5. A lock for a mechanism of the type which the supporting member, said lock member being ' includes an upright tubular element and an ele cooperable with said supporting member and said ment mounted in said tubular element for longi ram member to prevent unauthorized lowering tudinal movement with relation thereto and pro movement of the ram member relative to the jecting beyond the upper end thereof, said lock 55 support upon such engagement, and'means on comprising a member supported normally by a _ one of said lock or ram members movable into ñxed part of said tubular element and rotatable and out of engagement with the helical sur about the projecting portion of said movable ele faces on the other member for preventing rela ment, said rotatable member and said movable tive rotation of said lock and ram members when element having cooperating parts operable upon 60 said means is so engaged, whereby to maintain the upward movement of said movable element Vsaid lock member in a ñxed position respecting to cause said rotatable member to rotate under said ram member, regardless of lifting or lower the influence of gravity in close proximity to ing movements of the ram, when said means is so-engaged. said fixed part while said movable element moves upwardly with relation thereto, and to press said 65 9. In a, jack4 device of the class described, in rotatable member `into rotation preventing en combination, a supporting member, a ram mem gagement with said fixed part when said mov ber associated. therewith for lifting and lower able element tends to move downwardly, and ing movements relative'thereto, a lock member thereby prevent said downward movement. associated with said ram member for rotation 6. A mechanism comprising an upright tubu 70 relative thereto about a substantially vertical lar element, an elongate element mounted for axis, said ram member and said lock member longitudinal movement in and projecting beyondv one end of said tubular element and held against having parts including cooperating helical sur faces whose helix angle is such that, upon lift rotation therein, , >an annular member rotatably ing movement of said ram member relative to mounted about the projecting portion of said 75 said supporting member, the weight of the lock 291095181 7 member WillA cause ` rotational- movement of., said look member downwardby gravity relative to the ram member until the loekmembe'r engages the supporting member,- said lockrmember being co operable withv said supporting member and» said ram member to prevent unauthorized lowering movement of the ram member relative to the 8 supportxupon suchy engagement,- and Yanec‘cent'ric member pivoted Onsaidlook member and mov able into and out of. engagement with therhelical surfaces on the ram member. for preventing> rela tive rotation of said nut and> said ram member when said eccentric member> is so engaged. WILLIAM L; SIMONTON.