US1736419A - Derrick - Google Patents

Description

Nov. 19, 1929.

Original Filed April 30 1925 A. SMITH DERRICK 2 Sheets-Sheet l 56 4. a9 5 65 L30 o; o i 8L9 ea o 30 6-7 0. //9 6 I J/ i 5144mm (WWW 204% 51722272 N 1 1929. A. SMITH 1,736,419

DERRICK Original Filed April 30, 1925 2 Sheets-Sheet 2 IDIDDDDDDIDDD I n 0 I I o I Q n 0 a 1 Patented Nov. 19, 1929 UNITED STATES PATENT OFFICE ARVEY SMITH, or WINCHESTER, ILLINOIS, Assrcnon To KOEHRING COMPANY, or MILWAUKEE, WISCONSIN, ACORIPORATION or WISCONSIN DERRICK Application filed April 30, 1925, Serial No. 27,095. Renewed. November 6, 1926.

My invention relates to improvements in derricks and has reference more particularly to those used on road pavers for the purpose of hoisting batch boxes from donkey trains 5, and swinging such boxes to the machines.

A well known type of derrick for this purpose, embodies a mast which is mounted for vertical sliding and when free of load, is raised by spring means, so that a swivel foot on its lower end is clear of the ground. Then, when the mast is under load, the foot descends onto the ground and forms a pivotal support for the mast so that the latter may be turned to swingthe load to the desired point. It it the primary object of my invention to improve upon this type of derrick, by the provision of co-acting means embodied with the mast and its foot, for automatically effecting turning of the mast when it is under load, and in this connection, a further aim is to provide a foot which is sufiiciently heavy to remain stationary upon the ground during at least part of the upward movement of the mast, effected by the spring means. Thus, 5' after the mast has lowered under load and has swung the load to the desired point, freeing of the load and consequent raising of the mast by the spring means, will effect reverse turning of said mast to again, position it at load-receiving position.

A still further object is to make novel provision to permit the foot of the mastto adapt.

itself to the ground, regardless of any irregularities in the latter, without danger of placthere is no danger of breaking such connecting means or causlng binding thereof.

Yet another object is to provide a unique. brake means whereby the turning movement ing any prying strain upon the connecting. means between said foot and the mast,'so that In the drawings above briefly described, the numeral 1 designates a portion of the common frame of a road paver, said frame having upper and lower bearings 2 and 3 in which a mast 4 is mounted slidably and rotatably. A conventional boom 5 is shown extending from the mast 4, connected at its upper end with the bearing 2,.by a chain 6, and provided with sheaves 7 over which a hoisting cable8passes. A portion of this cableis shown engaged with a pulley block 9 for connectionwith a batch box 10 to be lifted, and other portions of-said cable are shown strained around sheaves 11 and 12 carried respectively by the mast 4 and the frame 1.

At 13, a coiled tension spring is shown, one end of said spring being appropriately con nected with the frame 1, while its other end is connected in the conventional or any desired way with the mast 4, so that the spring exerts its power to raise the mast and associated parts when free ofload. As soon as the derrick is connected with a load however, and the cable 8 is operated, the mast 4 slides downwardly againstthe tension of the spring 13. I-Ieretofore, this downward sliding of the mast has brought a foot at its lowerend into contact with the'earth. and after lifting of the load, this foot has constituted a pivotal support for the mast so that it may be swung about a vertical axis to move the load to the desired point. This moving is effected manually, by the use of one or more men pulling upon a rope, but due to the nature of my invention, turning of the mast 4 and consequent swinging of the load to its destination is automatically carried out. This result may be obtained in numerous ways, one of which is illustrated, and described below.

At 14, a heavy metal foot is shown for the mast 4, said foot having a recess or bore 15 whose opposite sides are provided with helical 18 is connected by" a flexible joint with the"= lower end of the mast 4, so that the foot 14 may adapt itself to irregularities on the surface of the ground. In thepresent-showing,

the flexible joint comprises an car 19 rising from the member 18 and receiving in a noteh- 20 in the lower end of the mast 4, a pivot pin 21 being passed horizontally throngh said mast and car. This pin, I have shown transverse to the axis of the rollers 17 to allzsw' pit otal movement in ans di-retion, andit will be seen that said rollers will anew pivotal movement in a direction at right angles,

that in street a universalconn'e tion is previded between the'm'as't and'the feat 14.

Preferably, the tracks or grooves lfi eir tend entirel to thetop 6f the foot 14 and withdrawal of the toilets-or tlidlike l-Tfr-ol'n engagement with said tracks; ispteveutect by acap ring-o1: the like 22 whiclnhaywtll be se=- cured tathetop of the foot byst're'ws Above the heatin 3, I have shown a vet:- tically elongated, fiat-sided, sectional hetly' 24secured-tothe mast any fasteners 25x- This body24 passes slidably through air opening" ina brake drum 26, establishing a driving co nection between said drum and themast 4. A stationary brake band QT'sur'r undstlle drum 26; and may welllie-confined between flanges 2 8 onsaid drum ,sothat the latter is] held against ve'itioal'moveiheiit; The band Q/Z' may be stationarily held by any preferred means such as the bracket arm: 29, and appropriate operating connections" 30 may be" provided for tlie'brake band-27', said conned tions preferably" having a footlever" 31- by means of'yvhich they ma be operated-to contract theband27.

Ordinarily, thepa-rts' may be considered as standingsubs'tantially as shown in Fig. 1, ex

cept that the that 14and the l'nasti 4-" will be.

elevated to a slightlygr ater extenaby the spring 13, so that said foot is clear of the ground; Whe new the-derrick reconnected to a load a nd the cable 8 is Wound in the usual manner, the first movement whielitakes place', is' downward sliding of the: mast 4 through the brake drum-26; until'the foot 1 4 rest's upon and adaptsitselfto the gteund. During this" movement, the brake 27 has been heldflinclon matted positidn the operator" will contime to 'lidld it in thistoutlitiouu-ntil the dew rich o eratestoraise theload 10 to the-de sired point: Thus, during this raising move meat, the mast 4 held against rotation When the loatl'has heen-taised tothe desired extenthowever; thett-ake isat'ota'lly partially released, with the result that the load 10 slides' the masts dewnwattlly withrespect' to the foot 14 which then rests stationarily on the ground. This causes the rollers or the like 17 and the tracks 16, to effect rotation of the mast 4, so that the load may be swung horizontally to any desired point, Within an arc of substantially 180. As soon as the load is dumped,- the spring 13 exerts its force to raise themast 4, but the foot 14 is sufliciently heavy tothen remain stationarily upon the ground, With-the result thattlieco-acting tracks and shoes 1617, act reversely from their previous action and thus swing the mast 4 and associated parts to their original positions. the time thisrelation takesaplace, the shoes 17 have reached the upper extremities of the tracks 16 and the mast4 will then:- serve to elevate the foot; 14 to ioint abovethe sur= face of the" ground under the influence of the spring" 13 It will be s'een froln the foregoing that I hatspmvicled distinct and very advantageousil 'nprov'enients in dei ricks of the-type embody'i-nga mast which is normally raised but is shifted downwardly under load: On ac= count o-fthe' excellent results obtainable from the details disclosed, they may of course be followed, but it'isto be understood that the: present disclosure is forillustrative purposes only and that within the scope of the invention as claimed, numerous modifications may bemacle; v

VVheII there is=no1load on-the-mast, it is held its highest position by the coil spring. When the'mast is thus held, the foot isolf the ground, and due to it s weight, it is atits lowe'stpositio'nlon the-mast as shown in Figure 1. The brake is now applied, and a load'hoisted, The weight of the load causes the mast to movedownW-ardly until the: foot ispressed agai st the ground; The brake prevents turning of the mast, so that any further downward movement of. the same must be aocolnp'anie'dby a turning of the'foot, due to the helicali cam tracks therein, and; the shoes carried by the mast. Turning of the foot is prohibited by its frictional and compressive engagement. with the ground caused by its own- Weight and the weight of. the load on the mast. When the brake is released, the

mast isfree to turn in: the foot,and does sov under theweight ofthe loadcarriedltliereby,

I claim 1. Ina derrick oftlie type having amast mounted for downward movement under load; and provided also With means for rais ing said mast when free of'load'; a groundengagingfoot for the mast adapted to rest stationarily on the ground 'during downward movementof the mast, and co-aoting means embodied with: the foot and mast for turning said mast With respect to said foot upon said: downward movement of the mast. V

2: A machi'ne as specifiediinlclaim l said co acting means comprising a helical cam track and a shoe engaging the same.

3. In a derrick of the type having a mast mounted for downward movement under load, and provided also with means for raismg said mast when free of load; a groundengaging foot for the mast adapted to rest stationarily on the ground during downward movement of the mast, said foot having a recess receiving the lower end of the mast, the wall of said recess being formed with a helical cam track, and a lateral shoe on said lower end of the mast engaging said cam track and disposed at the upper end thereof when the mast is free of load.

4. A structure as specified in claim 1; said foot being sufiiciently heavy to remain stationary on the ground and cause reverse turning of the mast under the influence of said coacting means during at least part of the upward movement of said mast.

5. A structure as specified in claim 3; said foot being sufliciently heavy to remain stationary on the ground and cause reverse turning of the mast under the influence of said cam track and shoe during at least part of the upward movement of said mast.

6. A structure as specified in claim 1; said mast being jointed adjacent said co-acting means to permit said foot to adapt itself to the surface of the ground without danger of placing a prying strain on said co-acting means.

7. In a derrick of the type having a mast mounted for downward movement under load, and provided also with means for raising said mast when free of load; a groundengaging foot for the mast adapted to rest stationarily on the ground durin downward movement of the mast, said foot aving a recess receiving the lower end of the mast, the wall of said recess being formed with opposed helical cam tracks, a member movable vertically in said recess and having shoes projecting in opposite directions an engaging sa d tracks, and a flexible joint connecting said member with the lower end of the mast, to permit the aforesaid foot to adapt itself to the surface of the ground without danger of placing prying strain on the aforesaid member.

8. A structure as specified in claim I; together with a brake drum surrounding said mast and having a driving connection therewith, said driving connection permitting sliding of the mast through the drum, and a brake co-operable with said drum, provision being made for holding said drum against vertical movement.

9. In a derrick of the type having a mast mounted for downward movement under load, and provided also with means for raising said mast when free of load; a brake drum surrounding said mast and hav ng a driving connection therewith, said driving connection permitting sliding of the mast through the drum, and a brake co-operable with said drum, provision being made for holding said drum against vertical movement.

10. In a derrick of the type having a mast mounted for downward movement under load, and provided also with means for swinging the mast to transfer the load from one place to another cooperative with the ground on said downward movement of the mast, a brake drum associated with the derrick mast for controlling the swinging and movement of the same and brake means cooperating with said drum substantially as set forth.

11. In a derrick of the type having a mast mounted for downward movement under load, means associated with the derrick for automatically swinging the same incident to its vertical movement, brake drum means connected with the mast for controlling its swinging movement and including a brake band acting on the brake drum substantially as described.

In testimony whereof I have hereunto affixe'd my signature.

ARVEY SMITH.

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