US2212711A

US2212711A - Hoist for building material

Info

Publication number: US2212711A
Application number: US223669A
Authority: US
Inventors: Macisaac Donald
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-08-08
Filing date: 1938-08-08
Publication date: 1940-08-27
Anticipated expiration: 1957-08-27

Description

Aug. 27, 1940. 0. m lsAAc HOIST FOR BUILDING MATERIAL 2 Sheets-Sheet l Filed Aug. 8, 1938 Aug-1Z7, 19 0- o. M lsAAc... 2,212,711

KOIST FOR BUILDING MATERIAL Filed Aug. 8; 1938 21Sheets-Sheet 2 G, I FIE}. E.

Patented Aug. 27, 1940 UNITED STATES PATENT OFFICE 8 Claims.

This invention comprehends the provision of a hoist for concrete and other building materials which is adapted to be erected or disposed in a convenient location adjacent the site of a proposed building for the purpose of conveying materials from a source, as for instance a conerete mixer, to a selected point, or points, at required elevations for disposition on a progressing structure. a

10 I prefer to construct my improved hoist in such a manner that it may be readily portable to and from diiferent jobs and also to and from dlfierent positions on a particular job. .Thus, when arranged at a starting point it may be moved step by step along a wall or section of a structure for elevating and delivering materials to successive positions.

A primary characteristic of a hoist embodying my invention consists in the provision of a receptacle for material, commonly called a "skip or bucket which is pivotally held so as to be readily tiltable for discharging its contents at a predetermined elevation and which is operatively connected with a power operated winch, as by means of cables or otherwise, and the further provision of a vertically guided member commonly termed a dilly, which is counterbalanced or so controlled by the winch and associated with said receptacle, that when the latter has attained a predetermined elevation the weight of said dilly will cause the receptacle to tilt and thereby dump the contents thereof.

My improvements also include, if a portable structure is employed, a chassis provided with a suitable running gear, and otherwise a suitable base,on either of which is mounted a power operated hoist, and a tower or derrick of fixed or adjustable height for operatively supporting the skip and dilly. Preferably the derrick is hinged to the chassis so as to be disposed longitudinally of the chassis while the hoist is being moved from one location to another.

Moreover my invention contemplates the advantageous use of a member (dilly) which is emploved to vertically guide the skip on the tower, as a means whereby to tilt and dump the skip, without necessitating the use of trip devices such as heretofore used and which are unreliable and aiiord a limited and a difiicult control to dump at any selected elevation within the limits of lift of the hoist, the trip means of my invention being readily and easily operable at will, to positively dump the skip at any desired elevation within the limits of travel of the skip.

I have shown a preferred form of hoist for building material in the accompanying drawings, embodying my invention, subject however, to modification within the scope of theappended claims, without departing from the spirit of my 2 1 invention. 5

Referring to the drawings:

Fig. 1 represents a perspective view of a hoist constructed in accordance with this invention;

Fig. 2 is a schematic view showing the skip in normal position in dotted lines and in the dump- 10 ing position in. full lines, also showing a variational form of control for the dilly to be used instead of the counterweight, parts of the mechanism being shown in elevation and other parts F in section for clarity of illustration; 15 Fig. 3 represents a front elevation of the skip showing the manner of connecting the same with the dilly;

Fig. 4 is a top plan view of the skip with the dilly and associated parts shown in cross section; 20

Fig. 5 is an elevational view of the hoist as when collapsed in preparation for transportation thereof.

One embodiment of the hoist unit hereof, as shown in the accompanying drawings, generally 25 comprises a vehicular base A including suitable running gear B, casters C and an eccentric chock or wedge device C. Supported on this base is a tower or derrick D hinged thereto as at D and adapted to be folded, as shown in Fig. 5, to facil- 30 itate transportation of the unit. A power oper-- ated winch E consisting of one or more drums F and F is supported on the base and operates a skip or bucket G as by means of a cable G controlled by the drum F, while a weighted member 35 or frame H known as a dilly, is vertically slidably supported upon the tower or derrick D and provided with an outwardly projecting trunnion H' for effecting the tilting of the skip. A chute J supported on the tower receives material dumped from the skip. G, and a means such as the counterweight K provides for control of the dilly B.

so that the dead weight thereof may be'eiiective at predetermined elevations of the skip to cause the latter to tilt, whereby to dump the skip ccn- 45 tents into the chute J.

The elements and devices above referred to, are arranged so as to provide a compact hoist unit which, when collapsedand arranged as shown in Fig. 5, may be readily moved from one location 50 to another and when set up, as shown in Fig; 1, may be readily moved about in small compass for delivering the building material to the desired places in connection with the structure being erected. g5

the means for vertically guiding the ship or in other words, the dilly for the purpose of tilt the skip, it hecomee unnecessary to em ploy trips or other devices which prove umeli able of operation and limited as to control, for dumping the ship, and a more msitive and reliable or dumping action is provided for under control such that the trip may be tilted and dumped at any desired elevation over a wide range within the limits of the tower. The counterweight K prevents the weight of the dilly from being efiective thru the trunnion H to cause the sp to tilt until such time as the skip reaches a predetermined elevation [or better, until such time that the counterweight comes to rest and is no longer efiective. When the weight K comes to rest, the dead weight of the dilly H :wmes efiectlve thru the trunnion H to overbalance the forward end of the skip as the lifting action continues, but instead of being lifted bodily, the skip will at this time pivot on its main trunnions and thereby dump the material therefrom.

Referring now more specifically to the invention, it is seen that the vehicular base A, which may be of any suitable construction, is, as here shown, constructed as a somewhat flat body having a. loading platform I at one end and the tower or derrick D at its other end, the skip normally resting on the frame members 2 at a point between the tower and the loading platform. Any suitable means such as a withdrawable bolt 3 may be employed for locking the tower in upright position. I

The running gear B, as here shown, consists of suitable wheels 4 mounted upon an axle 5, al-

though multiple wheels and axles may be used if desired. Any suitable means, not shown,'may be employed for mounting the base A in overor under-slung relation to the axle 5. The base A is preferably under-slung, as shown in Fig. 1, when the hoist is set up for operation, as this will dispose the caster C in contact with the ground when the eccentric chock or wedge member C may then be manipulated, as shown in Fig. 1, whereupon the structure is rigidly supported and thus held against accidental movement. When it is desired to shift the hoist to different positions as alongside a wall or to turn a corner, the eccentric chock C is manipulated so that the base A may be turned or swung on the wheels 4. This provides for turning the hoist in a small a radius.

However, as shown in Fig. 5, when it is desired to transport the unit from one building site to anothen'the axle 5 of the running gear is secured under the base A and this raises the base so that the caster C, eccentric. chock C and other structures will clear the ground and permit the towing of the unit as by a draw bar or other suitable means, not shown.

The derrick D may be of any suitable construction of fixed height or adjustable as is in any manner well known in the art, and preferably is arranged so that the power winch E is mounted within the base thereof whereby the skip cable G may extend vertically upward from the drum F over a pulley 6 at the top of the tower, then laterally over a pulley 1 carried by a lateral extension 8 of the tower and finally downward so that a hook 9 on the lower end thereof may be engaged in the eye III of the bail II. This bail i r n; 9 i/ a at is connected trlannions ii to the ship or hucket lit at a point somewhat forwardly of the center of weight of the bucket so that the latter tends to tilt hackwardly. However, the slip or bucket is limited as to tilting rearwardly, by means of stop members it and it on the bail and dilly Pl respectively.

Toe dilly it may he of any suitable construction provided it serves the purpose of vertically guiding the skip and acts when the dead weight thereof is applied to the skip to cause the forward end of the skip to tilt downward for dumping the contents thereof. As here shown, this means or dilly takesthe form of a substantially rectangular frame it having on each side opposed shoes iii slidably engaged with vertical guide members it on the tower D. The trunnion H extends outwardly from the lower end of this frame and passes thru openings in the outer ends of plates it fixed in any suitable manner to opposite sides of the skip. This provides a fulcrum point for the skip located below the discharge mouth of the skip and spaced somewhat inwardly of said mouth, whereby when the skip is rocked on said fulcrum point the discharge mouth will describe an arc and extend forwardly over the chute J. By this arrangement the skip is in 'efiect pivoted on the dilly, or in other words, the dilly'and skip are pivotally connected.

Means is provided for raising the dilly with the skip and for preventing the weight of the dilly from being effective to tilt the skip during the lifting of the latter to the predetermined elevation, at which the dumping is to take place. As here shown, this means may include the counterweight K arranged to slide in a vertical guideway l9 supported by the tower, and a cable 20' extending from said weight over a pulley 2| supported at the top of the tower and thence downwardly to a point where connected as at 22, with the dilly. Preferably the weight K is heavier than the dilly so that while the weight is suspended, the weight of the dilly will not be effective to tilt the skip. However, when the weight K comes to rest, as for example, against a vertically adjustable pin orstop member 23 in the guideway ii, the dead weight of the dilly then becomes effective thru its trunnion H on the forward end of the skip so that the pull on the cable G causes the skip to turn on the fulcrum H and thereby dump the contents thereof, as for example, into the chute J. The pin 23 is adapted to be mounted in any one of a series of openings 24 provided in the guideway so that the weight will strike the pin at different elevations, where upon the skip may be operated to dump at the correspondingly different elevations.

Instead of using the counterweight K and its associated elements for raising the dilly and restraining the tilting action thereof during the elevation of the skip to the desired level for dumping, I may employ the power operated winch, particularly the drum F thereof. Any suitable means such as the tackle designated J 'may be employed for lifting and lowering the chute to the desired elevation, there being a chute supporting bar 25 which may be secured as by any suitable means not shown, in different positions upon the tower.

When the cable G is slacked the combined weight of the skip and dilly being greater than that of the weight K will raise the weight K as the skip and dilly descend to the base A, whereby the hoist is ready for another material elevating operation.

I claim:

1. In a hoist, a tower, a skip for elevating and dumping material, a skip guiding and control member vertically slidably mounted upon the tower, a fulcrum member fixed to said guide and control member and pivotally connecting said skip with said control member, means associated with the tower for lifting and lowering said skip, and means operable for stationarily suspending said control member while the lifting of the skip continues, whereby the skip will tilt on said fulcrum member into dumping position, said means including a weight member, a guideway therefor on said tower, a pulley supported by the tower, a cable extending over said pulley and connected at its end with said guide and control member and said weight respectively, and a stop member against which said weight comes to rest to stop the elevation of the guide and control member.

2. In a hoist, a tower, a skip for elevating and dumping material, a skip guiding and control,

member vertically slidably mounted upon the tower, a fulcrum member fixed to said guide and control member and pivotally connecting said skip with said control member, means associated with the tower for lifting and lowering said skip, and means operable for stationarily suspending said control member while the lifting of the skip continues, whereby the skip will tilt on said fulcrum member into dumping position, said means including a weight member, a guideway therefor on said tower, a pulley supported by the v tower, a cable extending over said pulley and connected at its end with said guide and control member and said weight respectively, and a vertically adjusted stop member against which said weight comes to rest to stop the elevation of the guide and control member.

3. In a hoist, a tower, a skip guiding and dumping member vertically slidably mounted on said tower, a skip fulcrumed adjacent its dumping end upon said member and adapted for simultaneous vertical movement therewith and for tilting movement relative thereto, a bail pivoted on said skip between its ends, a hoisting cable connected with said bail and the tower for simultaneously raising and lowering the skip and said member, stop members carried by said bail and said dumping member for limiting movement of the skip in one direction and means op erating to counterbalance the weight of said dumping member during the lifting of the skip and said member to a predetermined elevation, then applying the weight of said member to overbalance and tilt said skip to a dumping position while the lifting force is applied to the s m.

4. In a hoist, a tower, a skip controlling member movable up and down on said tower, a skip fulcrumed adjacent one end on said member for movement into and out of dumping position, a single cable connected with said tower and said skip for hoisting said skip and said member and for tilting said skip, and means including a cable connected with said tower and said member and operable for relieving the weight of said member during the hoisting of said skip and member by said single cable to a predetermined elevation and then applying the dead weight of said memher to said skip through said fulcrum whereby a hoisting force then applied to the skip through said single cable will tilt the skip on said fulcrum into dumping position.

5. In a hoist, a tower, a skip for elevating and dumping material, a skip guiding and control member vertically s'lidably mounted upon the tower, means for fulcruming said skip on said control member for movement into and out of dumping position, a single cable associated with the tower and connected with the skip for lifting and lowering the skip and said member, and means including a cable operable for stationarily suspending said control member when the skip and said member have been lifted to a predetermined elevation whereby upon the further lifting of the skip through said first-named cable the dead weight of the control member is applied to and causes the skip to tilt, said lastnamed means including a Weight member connected with the cable thereof and stop means against which the weight is adapted to rest for stationarily suspending said control member so that the dead weight thereof will be effective for causing a tilting of the skip.

6. In a hoist, a tower, a skip controlling member movable on said tower, a skip fulcrumed adjacent one end to a marginal portion of said member for tilting movement to dispose the discharge end thereof exteriorly of the tower, a hoist cable associated with the tower and connected with said skip for lifting and lowering the skip and cable, means connected with the tower and member for relieving the weight of said member during the hoisting of the skip to a predetermined elevation and then automatically suspending the skip stationarily so that the dead weight thereof is borne by the fulcrum connection with the skip whereby further lifting of the skip will cause the same to tilt as aforesaid on its fulcrum.

7. In a hoist, a tower, a skip controlling member movable vertically on the tower, a fulcrum member extending outwardly from a point adjacent a lower corner of said member, a skip fulcrumed adjacent one end of said fulcrum member, a hoisting cable carried by the tower and connected with said skip at a point between the ends of the latter for raising and lowering the skip and control member simultaneously, and means including a cable connected with the tower and control member for assisting in the lifting of the latter while the skip is being raised to a predetermined position and then automatically applying the dead weight of the control member to the skip through said fulcrum member for tilting the skip into dumping position.

8. In a hoist, a tower, a skip mounted thereon for elevating and dumping material, a weight member associated with the skip and tower for movement with the skip thereon and means controlling said weight member for automatically relieving the weight thereof during the hoisting of the skip to a predetermined elevation and then applying the dead weight of said weight memher to said skip for effecting the tilting and dumping of the skip.

DONALD MACISAAC.