US1335782A

US1335782A - Hoisting mechanism

Info

Publication number: US1335782A
Authority: US
Publication date: 1920-04-06
Anticipated expiration: 1937-04-06

Description

. J. DOLAN.

HOISTING MECHANISM.

APPLICATION FILED nov. n. ma.

4 SHEETS-SHEET I.

fig u, I 6 z 4 E i Z EL g Z Z gas- B z 2' I P a J Z Z 25 9 /5 mmvron. (/a/x/v 1011M ATTORNEY l. DOLAN.

HOISTING MECHANSM.

APPLICATION mu) NOV. :1, X918 1,335,782. P tented Apr. 6, 1920.

4 SHEETS-SHEEI 2.

INVENTOR. Jam 00.41am

A TTORNEY J. DOLAN.

HOISTING MECHANISM. APPLICATION FILED Nov, H. mm.

Patented Apr. 6, 1920.

4 SHEETSSHEET 3.

//////////l/////A//V INVENTOR. Jam 0007M ATTGRNEY J. DULAN.

HMSHNG MECHANISM. APPUCATiUN FILED Nov. 11, ms.

1 ,335,782. Patented Apr. 6, 1920.

4 SHEETS-SHEET 4.

IN VEN TOR. (101W 0015M A'TTORNEY UNITED STATES PATENT OFFICE.

JOHN DOLAN, OF DAYTON, OHIO.

HOISTING MECHANISM To all whom. it may concern Be it known that I, JoHN Douay, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Hoisting Mechanism, of which the following is a. specification, reference being had therein to the accompanying d ra wing.

This invention relates to hoisting mecha nism.

The object of the invention is to provide a hoisting mechanism which, when in its normal or collapsed position, will be very short, but which may be extended to a relatively great length; which can be quickly and easily operated to extend or retract the Same; and which will be of a very strong, durable construction and very simple in its operation. I

To this end it is also an object of the in vention to provide a. mechanism of this kind in which the several lifting elements will be normally locked against movement and will. be automatically and successively released, and, further, in which the several lifting elements will be locked in their extended positions and automatically released as the structure is retracted.

It is also an object of the invention to provide a mechanism of this kind with interchangeable operating mechanisms, either of which can be manipulated without'displacing the other.

It is also an object of the invention to pivotally mount such a mechanism upon a portable platform and provide means for raising and lowering the same into and out of an operative position.

Other objects of the invention will appear as the mechanism is described in de tail.

In the accompanying drawings Figure 1 is a sideelevation, partly broken away, of a lifting jack embodying myinvention; Fig. 2 is a front elevationfpartly in section, of such a lifting jack; Fig. 3 is a sectional view (if the upper and lower portions 'of the lifting jack shown in Figs. 1 and 2; Fig. 4 is a side elevation of the worm gear with the pawl actuating plate removed; Fig. 5

is a sectional view, taken on the line 5-5 Specification of Letters Patent Patented Apr. 6, 1920.

Application filed fiovember 11. 1918. Serial No. 261,968.

of Fig. 4; Fig. 6 is a side elevation of'the worm gear with the pawl actuating plate in place; Fig. 7 is a side elevation, partly broken away, of a portable hoistin mechanism embodying my invention; lfig. 8 is a front elevation, partly broken away, of said hoisting mechanism: Fig. 9 is a plan view of the turntable; Fig. 10 is a trans verse sectional view of the turntable; Fig. 11 is a transverse sectional view of the supporting structure and lifting elements of Figs. 7 and 8; Fig. 12 is a sectional view of the controlling drums of

Fi

7 and 8; and Fig. 13 is a plan view 0 the nozzle supporting and actuating device.

in these; drawings l have illustrated two embodiments of the invention, which are the same in their essential characteristics but show the mechanism as adapted for different purposes. it will be understood, however. that while I have shown embodiments of the invention for two purposes that it not limited to the particular pur poses here illustrated, but that the invention can be embodied in mechanisms of various forms and for various purposes. In the two embodiments of the invention here illustrated, that shown in Figs. 1 and 2, is a lift-in 4 jack such as is commonly used for automo ill? or street car purposes, while the embodiment shown in Pigs. 3 and 4 is a. hoisting mechanism for miscellaneous purposes. It may be used as a lift for elevating a load: it may be used as a hose tower, as shown in the drawings; it may be used as a support or brace for forms or other elevated structures; or it maybe used for anyone of numerous other purposes.

The mechanism will. of course, take different forms. according to the difl'crent purposes for which it is to be used. The lifting jack illustrated in Figs. land? consists of a supporting standard or base 1 provided at its lower end with flanges 2 to support the same in a vertical position. This standard or base is hollow and has mounted therein a plurality of overlapping extensible lifting elements. These lifting elements may take various forms. but I prefer that they should be of a. telescoping construction and -sh.ould be provided on their faces with teeth or racks to cooperate with the operating mechanism. In the resent construction the jack is provided wit two lifting elements,

the outermost of which, 3, is slidably mount ed within the hollow base or standard 1 and is substantially U-shaped in cross section, the forward or free ed es thereof being provided ith teeth as s own at 4. Mounted within t e outer or U-shaped rack is a sec-- ond lifting element in the form of a straight bar 5, provided along its forward edge with teeth 6. The teeth of the two racks are arranged in alinement so that they may be engaged by the same actuating device. This actuating device may be of any suitable character, either pawl and ratchet mechanism or rack and pinion mechanism being well adapted for the purpose. In the present instance I have .employed the rack and inion lift and, as here shown, a pinior 7 is ournaled in the side walls of the stand ard Land extends for substantially the full Width of the two lifting elements. Pref erably, the pinion is carried by a shaft 8 mounted in the side walls of the standard 1 and having its ends projecting beyond the respective walls. Rigidly secured to the projecting end of the shaft is a ratchet wheel 9 which is acted upon by a pawl 10 carried by a lever 11, which is bifurcated and is mounted on the shaft 8 on opposite sides of the ratchet wheel. A do" 12 cooperates with the ratchet wheel to hold the pinion 7 against reverse movement and thus retain the lifting element or elements in their elevated ositions during the return movement of t e lever. It will be noted that the teeth of the two racks of the outer lifting element 3 are cut away adjacent to the pinion 7, so that this outer element will not be affected by the operation of the pinion until the inner rack or lifting element has been fully extended. When the inner element has been fully extended it automatically picks up the outer element and carries the same upward with it until the teeth of the racks of the outer element are bred ht into mesh with the pinion 7, after whicll continued movement is imparted to the outer element by the pinion. Any suit able connection may be established between the inner and outer lifting elements to cause theformer to lift the latter but, preferably, the' inner element has near its lower end outwardly extending lugs 13 arranged to en gage inwardly extending lugs 14 carried by the outer lifting element near the upper end thereof and arranged in the paths of the respective lugs 13 on the inner element. The upper ends of the lugs 13 of the inner lifting element are spaced some distance from the lower end of that element to enable the inher lifting element to be move by the pinion 7 after the lugs or shoulders 13 have engaged the cooperating lugs or shoulders 14, and thus cause the outerlifting element to be elevated by the inner lifting element far enough to bring its teeth into mesh with the pinion 7. This arrangement of the lugs also causes the two lifting elements to overlap sufficiently to give rigidity to the extended structure.

Suitable retaining means are provided for holding the inner lifting element or rack 5' in its extended position relative to the outer lifting element during the movement of the latter. This retaining'means may be .of any suitable character but, in the present construction, I have provided the outer lifting element at its upper end with a collar 15 in which is journaled a pinion 16 meshing with the rack of the inner lifting element and having rigidly secured thereto, in the collar 15, a ratchet wheel 17. Cooperating with this ratchet wheel is a dog 18 which is acted upon by a spring 19 to cause it to engage the ratchetwheel when the outer lifting element has been moved from its normal position, and to thus hold the pinion l6 and, consequently, the inner lifting element against downward movement. This dog acts upon the ratchet wheel to retain the inner lifting element in its extended position only so long as the outer lifting element is out of its normal position and, as soon as the outer element is returned to its normal position the dog is again inovcd into inoperative position and the inner rack released to allow the same to move downward. To accomplish this I have provided the dog 18 with a depending finger 20 arranged to engage a plart of the standard 1, such as the upper end thereof, when the outer lifting element is in its normal or lowermost position, and thus retain the dog in its inoperative position. The first upward movement of the outer lifting element, which is imparted thereto by the inner-lifting element. carries the finger out of engagement with the standard and permits the dog to operative-l engage its ratchet wheel and thus lock the inner lifting element against downward movement; relatively to the outer lifting element. Just as the outer lifting clement completes own ward movement the finger 2U will/again {engage thestandard and more the dog ont of engagement with the ratchet 'whee ltlni automatically releasing the inner the load to continue uninterrupted.

It is also desirnblethat the outer lifting element or elements should be held against vertical movement during the upward travel of the inner eleuu-nt or elements. To accomplish this and prevent the outer element from being lifted. through frictional contact or otherwise, with the inner element, I have provided a detent which normally locks the outer element in its lowermost position and is automatically released, just prior to amen *3 and permitting the downward movement of the time that the inner lifting element picks within this housing. A spring 24 acts upon the dog to cause it to automatically engage the shoulder and to hold it in enga ment therewith. Means are provided w ereby the'upwardmovement .of the inner lifting element will move this dog out of engagement with the shoulder just rior toihe beginning of the movement 0 the outer liftmg element. In the present arrangement the doghas connected therewith a finger 25 :havin' a laterally extending portion which above the lug 13 and so arran enten s through a slot 26in the outer lifting element and into the path of a projection 27 carried by the inner lifting element just d that it will engage the pin 25 and move t e dog into an inoperative position just before this lug 13 engages the corresponding Mg 14 on the outer lifting element, thus automatically releasing the outer lifting element and permittin it to move upward when the lugs 13 and If are brought into en agement.

- .In order that the lifting e ements may be lowered under load, I prefer to provide the lifting pinion 7 with a worm operating mechani sm, by means of which the racks may be slowly lowered, the detent pawl 12 having been first disengaged from the ratchet Wheel 9, and which may also be utilized to elevate the racks if desired. This worm mechanism may take various forms but, as here shown, see Figs. 4 to 6, it comprises a worm wheel 28 mounted on the shaft of the pinion 7 on that side of the standard 1 o posite the ratchet wheel 9, and meshing wit a worm 29 journale'd in suitable brackcts 30 carried by the standardand having a handle 31 by means of which it may be rotated. It is, of course, necessary that the worm should be disconnected from the pinion while the latter is being operated by the lever, and I have, therefore, mounted the worm loosely on the end of the shaft 8, which carries the inion 7, and have provided the same w th a flange having arranged internally thereof a circumferential .series of. rahchet teeth 32. These ratchet and transmit rotary movement through the plate 34 to the shaft 8. And when it is desired to lower the device, the worm 29 is turned in a reverse direction and the load on the shaft 7 will cause the pawls to follow the ratchet teeth as the worm wheel isrotated, The springs are so connected with the pawls that when the latter are moved inwardly the springs will be carried across the axes of the respective pawls and W111 thus serve to hold the pawls in their inner or inoperative positions, thereby disconnecting the worm wheel from the pinion 7 and ermittingthe latter to be operated by the liven. Suitable operating mechanism may be provided for moving the pawls into and out of their operative positions and, in the present instance, I have loosely mounted a plate 36 on the end of the shaft 8 and have provided this late or disk with inclined slots 37 throng which extend pins 38 carried bv the pawls, these pins being preferably the same pins to which the springs are connected. The disk is provided with means, such as a knob 39, for rotating the same and it will be a arent that 11 ion a partial rotation of the lsk the incline slots 37 will act upon the ins to move the awls inwardly and out o engagement wit the ratchet teeth, in which position they will be held by the springs 35. I also prefer to mount within the collar 15 a roller 40 against which the lifting element 5 bears and which serves to hold the same out of contact with the fixed walls of the structure and to reduce the frictional resistance to its movement.

The mechanism so far described is our bodied in a lifting jack but this same mechanism may, as has been above stated, he embodied without material alteration in hoisting mechanisms of various kinds and in that form of the device shown in Figs. 7 and S I have embodied this same mechanism in a hoisting mechanism comprising a number of lifting elements and having these lifting elements of considerable length so that he structure can be extended to a great height if desired, and I have also shown the mechanism as mounted upon a truck so thatit is readily portable from one place to another. The general construction and arrangement of the lifting elements is similar to that already described and the structure as a whole comprises an outer casing or standard 41 which is pivotally mounted upon a supporting structure. This supporting structure may be of any suitable character but, as here shown, it consists of a turntable 43 rotatablv mounted upon a truck. The standard or outer casing 41 has rigidly secured thereto-a hollow shaft 44 which is journaled in bearing brackets 45 rigidlysocured to the turntable. The shaft is arranged some distance from the end of the standard 41 and the supporting structure or turntable is so constructed thatthe end of the standard can swing through the same to permit the latter to be moved into a horizon tal or a vertical position. With the extensible lifting elements contracted, the structure may be laid flat upon the truck for transportation. When it is desired to use the same, it is swung upward to a vertical position or to such an inclination as may be desired. 'lo elevate the hoisting mechanism and retain the same in its adjusted position, I have rigidly secured to the opposite sides of the standard 41 segmental toothed racks 46 which mesh with pinions 47 rigidly secured to a shaft 48, on which is mounted a worm wheel 49 meshing with a worm 50 on a shaft 51, which is provided with a (rank 52 by means of which it may be rotated to raise and lower the hoisting mechanism about the shaft 44. The hoisting mecha nism may consist of any suitable number of lifting elements and, in the present con struction, l have shown it as comprising four, an outer element 53,

intermediate clements

54 and 54, and an inner element These several elements are provided with racks on their faces which mesh with a transverse pinion 56 in a manner similar to that above described. Rigidly secured to the pinion is a beveled gear 57 meshing with 'a second gear 58 on the upper end of a shaft 59 extending alongside of the standard 41 and having at its lower end a beveled pinion G0 which meshes with a similar pinion 61 on a shafit 62 which'is journaled in the shaft 44, the latter being hollow to receive the same. A crank 63 rigidly secured to the shaft 62 provides means for rotatin the same together with the shaft 59 and pinion 56. This construction enables the li ting pinion to be placed at the upper end of the standard 41 while the driving mechanism is placed near the lower end of the standard where it is more readily accessible. Each lifting element is provided with a detent comprising a pinion '64, ratchet 65, and an automatically operable dog 66, similar to those above described, and so arranged that the several lifting elements will be. automatical'ly and successively released as each preceding element completes its downward movement. Likewise, both the outer lifting element 53 and the intermediate lifting ele ments 54 and 54 are provided with detents (S7 to hold the same normally in their lowermost positions, these detents being tripped, in the manner above described, as the inner liftin element 55 and the intermediate lifting e ements 54 and 54, respectively, reach the upper limits of their movements. The automatic operation of the locking devices is of special value to-a mechanism such as that now being, described. as the length of the lifting elements is such that these parts are elevated above the supporting platform such a distance that they could not practically be operated b hand and the automatic operation of hose locks makes pos sible the application of the mechanism to such uses as that here described.

In order to operate the hoisting mechanism under a heavy load, I prefer to provide the same, in addition to the crank 63, with a worm gear, by means of which the lifting pinion may be operated. In this manner, very great power may be applied to the mechanism, although the speed attainable is less than that which can be had with the crank 63. To this end 1 have mounted on that end of the shaft 62 opposite the crank (53 a worm wheel 68 which meshes with a worm (it) on a shaft 70 provided with ac'rank 71. The construction of the worm wheel and the manner of operating the same are the same as have already been described and permit the worm gearing and the crank 63 to be independently operated.

The turntable upon which the hoisting mechanism is mounted may be of any suit able kind and, as here shown, it comprises a fixed ring 72 which is rigidly secured to and forms in ejfect a part of the truck frame 73. This fixed ring of the turntable is provided with brackets 74 cast integral therewith and adapted to receive and to be rigidly bolted to the members of the truck frame 73, thus firmly uniting these parts into a single structure. Arranged within the fixed member or ring 72 of the turntable is a movable member or ring 75 which is supported by, and is rotatable upon, the fixed member. As here shown, the fixed member 72 is provided with an inwardly extending annular rib 76 which extends into a similar recess 77 forming the rotatable member 75.

Anti friction rollers

78 and 79 arranged in the recess 77 engage the edge and top and bot tom surfaces of the rib 7n and facilitate the movement of the member 75. The movable member 75 has secured thereto frame members or platforms 80 upon which are mounted the several parts of the hoisting mechanism. These platform members are spaced apart to permit the lower endof the extensible structure to move between them as the latter is moved from a horizontal to a vertical position and the turntable is provided with an opening, as shown in Figs S and 9, to permit the passage of the end of the extensible structure when the turntable is in its normal position. Each iiicniber of the turntable may be provided with a permanent opening, but I' prefer that in the fixed member the space or opening should be normally closed and I have, therefore,

shown this space or opening as bridged by a section 81 of the fixed member of the turntable which is hinged atone end to the main body of said fixedfi'nember, on a horizontal axis. Consequently, this section will be normally in place to receive and coiiperate with the movable member of the turntable as the latter travels about the fixed member but. when it is desired to lower the extensible structure into a horizontal position, this hinged section of the fixed member can be readilyunoved out of the way, or the end of the extensible structure may be permitted to engage the same as it rises and thus automatically move it out of the way. Rotatory movement may be imparted to the movable member of the turntable in various ways,but .I prefer to provide the fixed member of the turntable on its outer edge with teeth 82 with which nfeshes a pinion 83 carried by a shaft; 84 rotatably mounted on the movable member of the turntable. As here shown, this shaft is journaled in a vertical bearing in the platform on the turntable and is provided at its upper end with a worm wheel 85 with which meshes a worm 86 having a crank 87 by means of which it may be rotated. The shaft of the worm may be extended in any direction to locate the operating handle in the most convenient lo cation, either at the front or the rear of the mechanism. but in the present instance I have, for the purpose of convenience, provided the worm with -a short shaft so that the operating crank is arranged at the rear end-of the platform.

The construction and arrangement of the telescoping lifting elements may take various forms but, particularly in a mechanism such as that shown in Figs and 8, it is desirable that this should be as light and compact as possible while. retaining the necessary strength. I have, therefore. as shown in Fig. 11, formed the body portions ofthe elements of thin light material, such as sheet metal, to the forward edges of which I have attached the racks which are of heavier material, such as castings. Preferably, the several elements are so connected one to the other or braced against one an other as to hold them against relative lateral movement in any direction without interfering with their relative longitudinal movement. To this end the several racks or castings which are indicated as a whole by the

numerals

53, 54, 54 and 55, are provided on their opposite sides with flanged projections 88, the flanges extending lengthwise ofthc racks and facing forwardly and rearwarilly on the respective sides of each rack. The flange 011 one side of the outermost rackinterlocks with a similar flange extending inwardly from the casing 41, while the flange on the opposite side of that rack interlocks with thefiange on the adjacent side-of the next rack, and so on. will he noted that not only do these interlocking fl'anges hold the several racks against forward relative movement, but they also hold them against transverse relative movement. and this without interfering in any way with the free sliding movements of the several racks. The thin sheet metal bodies of the liftingelements are preferably arranged directly in line with the racks so that the thrust will come directly thereon without twist or strain. In order that the several elements may be braced one against the other at their rear portions without causing any large amount of frictional contact, I have provided each element at each rear corner with vertical bearing bars 89, which are preferably in the form of angle bars, al-ranged in the inner corner and on the outer corner of the section, the bars on the adjacent sections bearing one against the other. These bearing bars stiffen the construction of the lifting elements, hold-the same in their properly spaced relation and form contact points betweenthe several sections, thus providing a free relative move ment with a minimum of frictional contact.

As has been stated, this hoisting mechanism may be used for various purposes and I have shown the mechanism illustrated in Figs. 7 and 8 equipped with apparatus to constitute the same a hose tower, by means of which nozzles attached to fire hose may beelevated to the desired height and there manipulated to direct the streams of water onto the fire. The application of this apparatus to the mechanism will require no changes in the mechanism, but the more addition thereto of certain parts. The upper end of the innermost lifting element 55 is provided at its upper end with a socket 90 adapted to receive and removably support any apparatus which it may be desired to attach thereto. In the socket there is mounted, in the present instance, a shank 91 of a yoke 92 which extends upwardly beyond the lifting element 55 and carries supporting and adjusting mechanism for several lines of fire hose 93 and their nozzles 94. Jonrnaled in the arms of the yoke 92 is a shaft 95 to, which is rigidly secured a supporting collar or sleeve 96 and on which in turn is rotatably mounted a nozzle-support ing member 97, this snpporting nember being rotatable about an axis intersectingthe axis of the shaft 95 at right an les. Rigidly secured to the supporting mem r 9'1, and arranged in the same plane therewith is a snag mental rack 98 which meshes with a beveled gear 99 which is carried by a sleeve 1061 ournaled on the shaft 95 near one end thereof.

identical, with the exce nozzles from the platform 80, I have meanted on the she-ft 95 and the sleeve 100 flrums 101 and 102, respectively.

Cables

3 and 104 are wound a out these drums a have both ends carried downward. The ends of the cable 103 are wound about

drums

105 and 106, mounted on one end of a shaft 107, which is journaled in suitable brackets 108 carried by the standard 41 of'the extensible structure, while the ends of the cable 104 are wound about

drums

109 and 110 which are rigidly secured to a sleeve 111 mounted upon the opposite end of the shaft 107. The con-' struction of the two pairs of drums is tion that one pair is mounted upon thesha and the other pair is mounted upon the sleeve and, consequently, the description of the Lonstruetion and operation of one pair of drains will apply to both. It may be noted here that the sleeve 111, has rigidly secured thereto a handle or operating wheel 112 by means 'of which it may be rotated, while a similar handle or wheel 113 is secured to the shaft 107. Referring to the

drums

109 and 110,

as shown in Fig. 12, it will be noted that the drum 110 is rigidly secured to the sleeve 111 while the druni 109 is loosely mounted thereon. The two drums are spaced a short distance apart and a ratchet wheel 114 is arranged betwecn them and rigidly secured to the drum 110, while a pawl 115 is pivot ally mounted on the adjacent side of the drum 109 and is arranged to engage the iatchet wheel 114. When the extensible structure is being extended the pawl 115 is disen aged from the ratchet wheel 114 so that both drums are free to rotate to permit the cable to be unwound therefrom hen the structure has been extended to the desired height,- the drums ure rotated b V band to tightcn the cables and the pawl is moved into engagement with the ratchct whccl, The it rangement of the ratchet wheel with relation to the pawl is such that when the, drum 110 is. rotated in a dirc;tion to wiml'its cuthcrcon. the teeth of the ratchet. wheel Wi l move past the pawl wheel. which will ridc loosely over them, thus pcrmitting thc cable to be unwound from the drum 10,9 as it is wound onto the drum 110, and therebyimparting mta'ry movement to the drum 102 and turning movement to the nozzles. When the drum H0 is rotated in pick up the pa [115, thus causing the drum 109 to rotate; vith the drum 110, thereby winding the cable onto the drum 109 and unwinding it in like amount from the drum 110 and impartingmoyenient m the drum 102and nozzles in the opposite direction, Pr ferably, both drums are provided with sp ings 110 which are )laeed under tension as the cable is unwouncljay the extension of the structure, and which serve to automatithe oppositenwcctlnn tliliratchet wheel will cally rewind the cable as the structure is lowered.

The construction and operation of the mechanism will be readily and rstood'froni the foregoing description thereof, and it will be apparent that, I have provided a hoisting mechanism of this character which has a very long lift in proportion to its collapsed length, which is of a strong durable construction, very easily operated either under a heavy load or under. a ,light load. and in which the lifting elements are nor mally locked in the desired I sitions and'are automatically released at t e proper times. Further, it will be obvious that motors or other power mechanism may be utilized for actuating the various parts of the hoisting mechanism. While I have shown and described. certain embodiments of the invention, I wish it to be understood that I do not desire to be limited to detail thereof, as obvious modifications will occ to a pen sonskilled in the art.

Having now fully described my invention, what I claim as new and desire to secure by'Letters Patent is:

1. In a hoisting mechanism, the combination with a standard, a plurality of overlapping extensible elements carried by said standard and means to successively impart longitudinal movement to said elements relatively to said standard, of a locking device carried b a succeeding element and adapted to lock the next preceding element against return movement, means tending to more said locking device into an operative position with relation to said preceding element, and a part connected with said locking device and arranged .to engage a fixed part of said mechanism when said succeeding element is in its normal position, and to hold said locking device in an inoperative position.

In a hoisting mechanism, the combination with a standard, a pluraIity ofoverlapping extensible elements carried by sa d standard and means to successively impart longitudinal movement to,said elements relatively to saith-standard, of a t'uothed member "carried by a succeeding clement against return movement and opcratively connected with the next preceding element a detent carried by said'suceeeding element and coiiperating with said toothed member tohold said preceding element, a springtendirx' to more said detent into engagement ith said tooth'edmember, and a part connected with said detent and arranged to' enga arelatively fixed part of *said nechan'ISnHWhen said succeeding member is moved to its normalposition and to more said detent out of engagement with said toathed memberf'and to retain the some out of engagement there: with. 1 i

3. In a hoisting mechanism, the combination with a standard, a plurality of overlapping extensible elements carried by said standard and provided with teeth on their adjacent faces, and lifting mechanism actmg on said teeth to successively impart longi udinal movement to said elements relatively to said standard, of a pinion carried by a succeeding element and meshing with the teeth of a preceding element, a ratchet (wheel connected with said pinion, a pawl carried by said succeeding member, a spring tending to move said pawl into engagement with said ratchet Wheel, and a part connected with said awl, and arranged to engage a relatively xedart of said mechanism to "move said aw out'of engagement with said ratchet w eel'when said succeedin member is moved to its normal position an to retain said pawl out'of engagement therewith so long as said succeeding element is in its normal position.

4. In a hoisting mechanism, the combination with a standard, a plurality of overlap ping extensible elements parried by said standard and means to successively impart longitudinal movement to said elements relatively' to said standard, of a collar secured to the upper end of a succeeding element, locking mechanism carried by said collar and arranged to operatively engage adpreceding element to'hold the latterngamst ownward movement, said locking mechanism comprising a 'toothed"rnernber,'a detent, a spring tending' to' move said detent into engagement with" said toothed member, and a part conncted with saiddetent and arranged to engage a relatively fixed part of said mechansin'*"and move said ,detent into an inoperative position when said succeeding element is 'ni'o'vedto its normal sition.

5; In a.boisting mecli nism, the combination with a standard, a plurality of overlapping extensible elements carried by said standard and provided with teeth on their adjacent faces, and lifting mechanism acting on saiditeeth to successivel impait longitudinal movement to said e ements relatively'to said standard, of a collar secured to theupper end ofya succeeding ele cut, a pinionrotatabl mounted in 'said col ar and adapted tomes withthe-teeth of a precedin"1elenle-Iit, a ratchet wheel connected with safdminion, a pawl carried by said collar an'lli dapted normally to engage said ratchet wheel to lock said preceding element against downward movement, and a part connected with said dctent and arran ed to engage a relatively fixed part of sai mechanism to 'nl've said detent out of engagement with said ratchet wheel when said succeeding ele' njent is moved to its normal position,

6. In a hoisting mechanism, the combina tion' with a standard, a' plurality of overlap p in}; extensible elements carried by saidstandard and means toisueqessively impart longitudinal movement to saldelements rolltively to said standard, of a separate lockin device for each succeeding element to loo the same against lon itudinal movement rellongitudinal movement to said elements rela-.

tively to said standard, of means to normally lock each succeeding element against longltudinal movement relativel' to said standard, and means controlled the next pre ceding element to render said locking means inoperative and thus release said succeeding element for longitudinal movement.

8. In a hoisting mechanism, the combination with a standard, a plurality of overlapping extensible elements carried by seldstandard and means to successively impart longitudinal movement to said elements rela tively to said standard, of a detentcarrie by a succeedin element and adapted to engage a relative fixed part of said meehak ism to lock saicl longitudinal movement andmeans actuated by a' preceding element to move said detent into an inoperative position and thus release said succeeding element for longitudinal movement. r Y

9. In a hoistin mechanism, the combination with a standaida plurality, of overlapping. extensible elements carried by said standard and means to successively impart longitudinal movement'to said elementsrelease said last element from said in parts, other locking parts carrie said last element and the element rece ing the same to lock saidprecedinge' ement against lon itudinal movement relatively tosaid last e ement, and means actuated an element preceding the said preceding element to release the latter from said lo cite ing parts.

10. In a hoisting mechanism, the bination with a standard a plurality overlapping extensible elements car said standard and means to successive? e13 part longitudinal movement toXsai ments relatively to said standard, eta collagiy carried by a succeedin element, a locking member carried by sai collar and coi'i'pgg} art of saidif mec nmisnrto lock said succee ing elementat-in with a relatively fixed against longitudinal movement relativelyto succeeding element against part longitudinal movement to said elements relatively to said standard, of a collar secured to the upper end of a succeeding element, a locking member mounted on sand collar and held normally in locking engagement with a relatively fixed part of said mechanism, a finger carried by said locking member and arranged t5 be engaged by a shoulder on a preceding element to more said locking member into an inoperative pd sition and release said succeeding element.

12. In a hoisting mechanism, the combination with a standard. a plurality of overlapping extensible elements carried by said standard and means to successively inrpart longitudinal movement to said elements relatively to said standard, of a collar secured to the upper end of a succeeding element, a detent pivotally mounted on said collar and arranged to engage a shoulder on said standard, a spring tending to hold said detent normally in engagement with said shoulder, a finger connected with said detent and having a part extending transversely of said succeeding element, and a shoulder carried by the preceding element to engage sai part of said finger to move said detent into an inoperative position.

13. In a hoisting mechanism, the combination with a standard, a plurality of overlapping extensible elements "carried by said standard and means to successively impart longitudinal movement to said elements relatively to said standard, of a collar secured to the upper end of a succeeding element, locking mechanism carried by said collar and arrangedto act upon the next preceding element to lock the same against downward movement, said locking mechanism c'omprisin apart ada ted to engage a relatively fixed part of sai mechanism to render said locking mechanism inoperative when said succeeding element is moved to its normal position, a second locking device carried by said collar and coiiperating with a relatively fixed part of said mechanism to lock said succeeding element against longitudinal' movement, and means actuated by said preceding element to render said last mentioned locking device inoperative and thus release said succeeding element for longitudinal movement. 4

14. In a betting mechanism, the combination with a standard, a plurality of overlapping extensible elements carried by said standard and having teeth on their adjacent faces and means to successively imstandard part longitudinal movement to said element relative v to said standard, of a collar secured to the last element to be actuated and projecting laterally beyond the sides of said element, a pinion mounted in said collar to engage the teeth of the element preceding said last element, a ratchet wheel connected with said pinion, a pawl arranged to normally engage said ratchet wheel to hold said pinion against rotation in one direction, a part connected with said pawl and arranged to engage said standard when said last element is in its lowermost position to move the pawl into an inoperative ositioma. detent pivotally mounted in saitf collar and projecting beneath the lower edge thereof, said standard having a shoulder to be engaged by said detent, means to hold said detent normally in enga ement with said shoulder, a finger connecter with said detent and haw ing a part extending transversely to said last element, and a part carried by said preceding element to engage said part of said linger to move said detent into an inopera tive position.

15. In a hoisting mechanism, the combination with a standard, a plurality of overlapping extensible elements carried by said standard and having teeth in their adjac'ent faces, a pinion extending transversely to said elements and meshing with-the teet of one of said elements and adapted to mesh with the teeth of another element after initial movement has been'imparted to said other element, cooperating parts carried by the first mentioned element and the succeed ing element for im arting initial movement to said succeeding e ement, and means for rotating said pinion to actuate said elements, of a worm wheel, means for connecting said worm wheel with and disconnecting the same from said pinion, and a worm meshing with said shaft and provided with ratchetteethi a sufpporting member rigidly secured to se sha t, a pawl carried by said member and held normally in en gement with the ratchet teeth of the sai worm wheel, and a worm meshing with said worm wheel.

17. In a hoistin mechanism nation with a stan ard, a plurality of overlapping extensible elements carried by said and having teeth in their adjacent the combi faces, 9, pinion meshing with the teeth of one of said elements and adapted to mesh with the teeth of the other elements after initial movement has been imparted to said other elements, a shaft connected with said pinion, means for rotating said shaft and said pinion to impart movement to said chi-- ments, of a worm wheel loosely mounted on said shaft and provided with ratchet teeth, a supporting member rigidly secured to said shaft, a pawl carried by said member and held normally in engagement with the ratchet' teeth of the said worm wheel, ii worm meshing with said worm wheel, and menus to move said pawl out of engagement with said ratchet teeth to permit said pin ion to be rotated independently of said. worm and worm wheel.

18. In a hoisting mechanism the uunbi' nation with a standard, it plurality do". overlapping extensible clen'ients curried by suid standard and having teeth in their :uliuceni faces, a pinion meshing with the teefh oi one of said elements and adapted to mesh with the teeth of the other elem-ants after iuitiui movement has been imported to said other elements, a shaft connected with said pinion. means for rotating said shaft and said pin ion to impart movement to said elements, of a Worm gear loosely mounted on said shalt and comprising a flange having an internal series of ratchet teeth, a plate rigidly secured to said shaft within said flange, it plurality of pawls mounted on said plate and held normally in engagement with said ratchet teeth, a second plate rotatubly mounted on said shaft adjacent to said pawls and having inclined slots therein, and pins secured tosaid pawls and projecting through the respective slots whereby the rotation oi said plate will move said pawls into or outtof engagement with said ratchet teeth.

19. In a hoisting mechanism, it standard, a plurality of overlapping extensible ele ments carried by said standard and having teeth in their adjacent faces, a pinion ex tending transversely of said elements, mesh ing with the teeth of one of said elements and adapted to mesh with the teeth of the other elements after initial movement has been imparted to said other elements, co- 0' crating parts carried by each preceding eitiment' and the next succeeding element to impart initial movement to said succeeding element, a shaft extending lengthwise of said standard, gearing connecting said shat t with said pinion, a second shaft arranged near that end of said standard opposite said pinion and gearing connecting said last mentioned shaft with the first mentioned shaft, and. means for rotating said last meutioned shaft.

20. 111,0, hoisting mechanism, a standard,

u plurality of overluppin extensible Blew ments carried by said stun urd and having teeth on their adjacent faces, a pinion mounted on said standard near the upper, end thereof, cxtcndin transversely of said elements, meshing wit 1 the teeth on one of said elements and adapted to mesh with the teeth on the other elements after initiwl movement has been imparted to said other elements. cooperating Jarts carried "by each preceding element and the next succeeding element to cause initial movement to be imparted to the letter, and means arranged over thut end of said standard opposite said pinion for imparting rotzitory movement to said pinion to cause said elements to be sue cessivcly extended.

21. In a hoisting mechanism, a standard, a plurality of overlappingextensible elements curried by said standard and having teeth on their adjacent faces, a pinion mounted in said stands rd near the upper end thereof, ex: tending transversely of said elements, meshing; with tho teeth on one of said elements and adapted to mesh, with the teeth on the other elements after initial movement has been imparted to said other elements, 005]) crating parts carried by each preceding element and the next succeeding element to latter, means arranged near that end of said standard opposite said pinion for imparting rotatory movement to said pinion to cause suid elements to he successively extended, and means carried by each succeeding element to lock the next )rcceding element in its extended position relatively thereto when said succeeding element has been moved from its normal position. and to automatically release said preceding element when so id succeeding element has been returned to its nornuil position,

22. In a hoisting mechanism, a standard, it plurality of overlapping extensible elements carried by said standard and having teeth on their adjacent faces, a pinion mounted in said standard near the upper end thereof, extending transversely of said elements, meshing with the teeth on one of said elements and adapted to mesh with the teeth on the other elements afteninitial movement has been imparted to said other elements, cooperating )arts carried by each preceding element and the next succeeding element to cause initial movement tobe imported to the latter, means arranged near that end of said standard opposite said pin-- ion for imparting rotatory movement to said pinion to cause said elements to be successively extended, means to normally look each succeeding element against longitudinal movement relatively to said standard and a part carried b actuate the loc ing devicefor the next suceach preceding element to i .matically release ceeding element and release the latter for longitudinal movement.

23. In a hoisting mechanism, a Standard, a plurality of overlapping extensible elements carried by said standard and having teeth on their adjacent faces, a pinion mounted in said standard near the upper end thereof, extending transversely of said elements, meshing with'the teeth on one of said elements and adapted to mesh with the teeth onthe other elements after initial movement has been imparted to said other elements, cotiperating arts carried by each preceding element and the next succeeding element to cause initial movement to be imparted to the latter, means arranged near that end of said standard opposite said pinion for imparting rotatory movement to said pinion to cause said elements to be successively extended, a collar secured to the u per end of each succeeding element, a loc ing device mounted in said collar to act upon the next preceding element to hold the same in its extended position when said succeeding elementj has been moved from its nor mal position, and comprising means to autosaid preceding element when the succeeding element is returned to its normal position, a second lockin device carried by each of said collars to loci? the respective succeeding elements against longitudinal movement relatively to said stand ard and comprising means actuated by each preceding element to release the respective succeeding elements.

24. In a hoisting mechanism, a supporting structure, a standard mounted on said structure, means for moving said standard into a horizontal position or an upright position, a plurality of extensible elements carried by said standard, means for successive] moving said elements into their extende positions, andmeans for locking each pre ceding element in its extended osition relative tothe ne'xt succeeding element when said succeedin element is out of its normal position and or releasin said preceding element when said succeeding element is re turned to its normal position.

25. In a hoisting mechanism, a supporting structure, a standard mounted on said supporting structure, means for movin said standard into either a horizontal osition or an upright position, a plurality of extensible elements carried by said standard, means for successively moving said elements into their extended positions, a collar carried by each of said elements except the first. and a lockirg device carried by each of said collars and a apted toicoo crate with a part carried by the next prece ing element to lock said recedin element in itsextended I1 the e ement carrying the ar has been moved from its normal position and to release said precediiig element when said last supporting structure and mentioned element is returned to its normal position.

26. In a hoisting mechanism, a supporting structure, a standard mounted on said supporting structure, means for into either a horizontal osition or extensible by said standard, means for successively moving said laments into their extended positions, a coll a of said elements except the first and a looking device carried by each of said collars and adapted to cooperate with a part carried by the next preceding element to lock said preceding tion when the element carrying the collar has been moved from its normal position and to release said preceding element when said last mentioned element is normal position, and a second carried by each collar to lock the element carryin r said collar normall a ainst movement re atively to said stand arri and means actuated by a preceding element to release the locked ment has been moved to its extended position.

27. In a hoisting mechanism, a structure comprising a turntable, mounted on said turntable, ing said standard into: either a horizontal position or an upright position, a pluralit of extensible elements carried b said stand ard and having teeth on their ad jacent faces,

supportin astandar moving said carried by each element in its extended posi- B0 element when said preceding 616- means for mov- 535 a pinion mounted on said standard near the upper end thereof and adapted to actuate said elements to successively move the same into their extended positions, 0 eratin mechanism mounted on said stan ard a jacent to said turntable and operatively conofw sh so: near one end thereoi" on said supporting structure,

elements carried 11' n 'a 'supgortsaid stan at and having teeth on their 11:

noted on said standremote from said adalpted to sue ements into acent faces, a pinion m and near that end thereof cesslvely move the several e ollow shaft and operatively a crank for roa worm gearing,

second shaft an shaft.

longitudinal movement to said elements relat their extended cautious, in second shaftjournaled .in said ii connected with said pinion tating said a oistmg mechanism, -.th e combitively to said standard, ofa collarcarried 15.0

by a su ceding element, a locking device carried by said collar to control the movement of one of said elements, and means to automatically actuate said locking device.

30. In a hoisting mechanism, the combination with a standard, a plurality of overlapping extensible elements carried by said standard, and means to successively impart, longitudinal movement to said elements rela' tively to said standard, of a collar carried by a succeeding element, a'lockingr device carried by said collar to control the movement of one of said elements, and means controlled by the movement of another element relatively to said succeeding element to actuate said locking device.

31$ In a hoisting mechanism, a supporting structure, a standard mounted on said structure, a plurality of extensible elements carried by said standard, means for successively moving said elements into their extended positions, a collar carried by each of said elements except the first, and a locking device carried by each of said collars and adapted to cooperate with a part carried by the next precedingelement to lock said preceding element in its extended position when the element carrying said collar has been moved from its normal position, and to release said preceding element when said last mentioned element is returned to its normal position.

32. In a hoisting mechanism, the combination with a standard, a plurality of overlapping extensible elements carried by said standard and means to successively impart longitudinal movement to said elements relatively to said standard, of a hollow collar carried by a succeeding element, a locking device mounted in said collar to control the movement of one of said elements, and means to automatically actuate said locking device.

33. In a hoisting mechanism, the combination With a standard, a plurality of over lapping extensible elements carried by said standard and means to successively impart longitudinal movement to said elements relatively to said standard, of a hollow collar carried by a succeeding element, a locking device mounted Within said collar to control the movement of one of said elements, and means controlled by the movement of another elcment relatively to said succeeding element to actuate said locking device.

In testimony whereof, I afiix my signature hereto.

JOHN DOLAN.