US3096076A - Apparatus for gradually lifting construction parts manufactured on a building yard - Google Patents

Description

July 2, 1963 E. WALL! 3,095,076

APPARATUS FOR GRADUALLY LIFTING CONSTRUCTION PARTS MANUFACTURED ON A BUILDING YARD Filed Nov. 16, 1959 min.

llll

MFA/7'01? KIFWS 7' W414 A,

United States Patent APPARATUS FOR GRADUALLY LIFTING CON- STRUCTION PARTS MANUFACTURED ON A BUILDING YARD Ernst Wiilli, 3 Alpenstrasse, Arbon, Switzerland Filed Nov. 16, 1959, Ser. No. 853,153 Claims priority, application Switzerland July 3, 1959 1 Claim. (Cl. 254-89) The present invention relates to an apparatus for gradually lifting parts of a structure manufactured on a building yard, comprising for each lifting place a stationary vertical supporting tube and a lifting tube parallel to the latter and adapted to effect limited vertical strokes. Such apparatus mainly serves to lift ceilings of structures formed in concrete on the building yard. In known apparatus of this type both of the tubes are provided with a row of openings adapted to receive bolts. When the lifting tube is lifted, for example by means of a lifting press, the ceiling is thereby supported on a bolt of this lifting tube. After the lifting stroke a bolt must be inserted into the opening of the supporting tube next to the ceiling on the under side thereof whereafter the lifting press may be unloaded and the lifting tube again lowered whereby the ceiling is supported on the bolt of the lifting tube. Upon the lowering of the lifting tube a bolt must be inserted immediately beneath the ceiling into an opening of the lifting tube, whereafter a further lifting stroke may be eifected. This repeated insertion and removal of the bolts is cumbersome and moreover the ceiling always must be lifted somewhat beyond the opening in the supporting tube receiving the bolt in order to afford for the insertion of the latter. In addition thereto there is always the danger present that the bolts fall out. The whole apparatus thus requires precise working and constant supervision whereby the workers always must work under the ceiling for inserting and checking the bolts. 7

It is a prime object of the present invention to provide an apparatus avoiding the above drawbacks. To this end according to the present invention an apparatus for gradually lifting construction pants fabricated on the building yard is characterized by the fact that the supporting and the lifting tube each are provided with at least a row of stationary supporting studs arranged along a generating line and equally spaced in axial direction, said tubes projecting through corresponding openings of a lifting plate with the lower side of which pawls associated to the rows of supporting studs and loaded so as to engage said studs are articulated in such manner that when lifting the lifting tube the lifting plate is supported by the pawl associated with the lifting tube on a supporting stud of said tube while the pawl associated with the supporting tube slides upwardly over the supporting studs of the supporting tube, and when lowering the lifting tube the pawl associated with the supporting tube automatically bears on the next lower stud of the supporting tube whereby the studs of the lowering lifting tube pass under the pawl associated to the latter.

As is easily understood only the lifting device engaging at the lifting tube, for example a pneumatically working lifting press, must be operated and controlled, such control preferably being eflected simultaneously for all lifting points from a common control apparatus placed outside of the plan of the construction part to be lifted. As the pawls of the lifbing plate engage and disengage automatically from the supporting studs of the two tubes any work in the dangerous zone beneath the construction part to be lifted is avoided.

Other features and advantages of the invention will become apparent from the description now to follow, of a preferred embodiment thereof, given by way of ex- 3,096,076, Patented July 2, 1963 ample only, and in which reference will be had to the accompanying drawings, in which:

FIGURE 1 illustrates the lifting apparatus in two dif ferent working positions during the lifting of a ceiling to be built into an existing room, and

FIGURE 2 illustrates in a perspective View and to a larger scale a detail of the apparatus in the two different working positions of FIGURE 1.

Referring to the drawings, reference numeral 1 designates the floor and 2 the wall-s while 3 designates the ordinary ceiling of a cellar room, into which an air raid shelter ceiling 4 .shall be mounted subsequently. This ceiling 4 is cast on a not represented intermediate floor whereby openings for the passage of supporting and lifting tubes 5 and 6 respectively, of the lifting appparatus to be hereafter described in more detail, are provided at the lifting points of the ceiling. Preferably there are four such lifting points prow'ded one in each corner of the ceiling 4. The supporting tubes 5 thereby are vertically rigidly tensioned between the floor 1 and the ceiling 3 by means of threaded heads 7. Beneath the casing for the ceiling 4 pneumatically or hydraulically operated lifting presses S are arranged and connected with a common pump 16 prefenably arranged at the outside of the room and driven by an electromotor 9. A not represented control device serves to operate and control, respectively, this pump 10. The flange of each lifting press 8 carries the lifting tube 6 which is shorter than the supporting tubes 5 to such an extent that when the tubes are erected, the upper lifting tube end is spaced from the normal ceiling 3 a distance which at least equals the stroke of the lifting press 8. The lifting tube 6 is removably mounted upon the lifting press 8. Both tubes 5 and 6 of the four lifting points each comprise two diametrally opposite rows of equally spaced supporting studs 5a and 6a respectively, extending each along a generating line. At the lower side of the ceiling 4 the tubes 5 and 6 project through correspond-ing openings of a lifting plate 11, onto which is supported the concrete ceiling 4. Each lifting plate 11 has downwardly projecting flanges to which are articulated pawls '12 formed as angle levers. Thereby one pawl 12 is associated with each of the stud rows of the two tubes 5 and 6. Each pawl comprises an arm projecting towards the associated tube and having a nose 12a adapted to cooperate with the studs 5a and 6a, respectively and an outwardly projecting arm carrying a weight 12b.

As soon as the concrete has set the ceiling 4 is supported on the lifting plates 11, of the four lifting points, whereby the plates 11 are supported on the tubes 5 and 6 by means of the pawls 12 the noses 12a of which rest on the lowermost studs 5a and 6a of the tubes 5 and 6 respectively. As visible at the left in FIGURE 2 the flange of the lifting press 8 and thus the lifting tube 6 is in its lowermost end position. During the subsequent lifting of said flange the lifting tube 6 is upwardly pressed into the position shown at the right in FIGURE 2. Passing over the studs 6a and the associated p awls 12, the plates 11 and thus also the ceiling 4 are raised about the stroke of the press 8. Thereby the noses 12a of the pawls 12 associated with tube 5 slide over the next upper studs 5a of the supporting tube 5. As the upper end posi- :tion 8 of the stroke is attained, the noses 12a of the pawls 12 associated with the tube 5 lie immediately above a stud 5a of this tube. As now the presses 8 are balanced, the lifting tubes 6, with the returning flange of the presses 8, drop owing to their weight into their starting position,

'whereby the studs 6a of these tubes pass under the outwardly deflected noses 12a of the associated pawls 12. The lifting plates 11 and thus also the ceiling 4 remain in the lifted position shown at the left in FIGURE 1 as the plates 11 are supported through the pawls 12 associated with the tubes on the studs 5a of these tubes 5. As the lifting tubes 6 attain their lower end position the ceiling 4 may be raised a new step by again actuating the presses 8. As the ceiling 4 is lifted into its upper end position it is secured'and' supported in appropriate manner at the construction whereafter the tubes 5 and 6 may be unloaded and removed. Thereby care must be taken that the tensioning heads of the supporting tubes 5 permit shortening of the latter at least about the thickness of ceiling 4- in order that these tubes 5 may be removed through the opening in said ceiling as the lifting is terminated.

' The described apparatus permits easy mounting of ceilings into finished construction, whereby after the mounting or assembling of the appauatus the only work left is the operation of the lifting presses 8. In the represented embodiment the tubes 5-, 6 are each provided with two rows of studs cooperating each with a pawl 12' of the lifting plate 11. Of course the tubes could also be provided with only one row of studs. Also the pawls could be loaded with springs instead of with weights. Further the studs could be shaped as teeth of a nack provided at the tubes instead of the cylindrical shape represented in the drawing. Also a control device may be provided which makes certain that all lifting presses work absolutely synchronously in order to avoid any unequal loading of the tubes and inclination of the ceiling to be lifted. It may be advantageous to arrange the lifting plates not as described below the ceiling to be lifted, but above the latter and to secure plate and ceiling together by screw bolts. In such a case the ceiling could be cast without lower casing directly on the floor of the room,

whereby the lifting presses are supported on the rigid supporting tubes land are connected with the lifting plates from above over pull members; The pawls of the lifting plates preferably are arranged in a box having an upper and a lower plate element so that the pawl boxes may be used as well above as also runder any ceiling.

I claim: 7

In a lifting system for lifting heavy parts of construction into flush engagement with a ceiling comprising for each lifting location, a lifting assembly therefor formed of a round stationary vertical supporting tube extending and the ceiling, a round lifting tube extending parallel to said supporting tube and having limited vertical lifting strokes, a lifting device disposed beneath the lifting tube to lift same, said lifting tube being removably mounted upon said lifting device, said supporting and lifting tubes extending vetrically through the construction part, and each of said'tubes having two diametrically-opposed rows of studs equally-spaced from one another in an axial direction,1a work supporting plate adapted to engage the underside of the heavy construction part, said supporting'plate having openings therein for the assembly of said round tubes therethrough, said supporting plate when so 'assembled upon said round tubes being slidablethereupon, weight loaded pawls pivotally connected to the underside of said supporting plate and respectively engageable with the respective rows of said supporting studs, said loaded pawls being so arranged that the pawls engaging the studs of the lifting tube when the lifting tube is elevated cause the work supporting plate to be lifted, and the loaded pawls that engage the studs of the supporting tube having slid upwardly over the studs of the supporting tube, and when lowering the lifting tube the pawls that engage the studs of the supporting tube automatically bear on the next lower studs thereof and the'studs of the lifting tube pass under the pawls associated therewith, whereby the assembled parts of the lifting assembly can be readily taken down from the ceiling and the constructionpart that has been brought into flush engagement therewith.

References Cited-in the file of this patent UNITED STATES PATENTS 842,490 Poggi Jan. 29, 1907 1,450,709 Bayles Apr. 3, 1923 2,775,869 Pointer Jan. 1, 1957 FOREIGN PATENTS 434,448 Italy Apr. 27, 1948 761,118 Great Britain Nov. 7, 1956 783,915 Great Britain Oct. 2, 1957

Images