AU649281B2

AU649281B2 - Builders lifting jack

Info

Publication number: AU649281B2
Application number: AU87701/91A
Authority: AU
Inventors: Andrew Reid
Original assignee: ANDREW REID NOMINEES Pty Ltd
Current assignee: ANDREW REID NOMINEES PTY Ltd
Priority date: 1990-11-08
Filing date: 1991-11-08
Publication date: 1994-05-19
Anticipated expiration: 2011-11-08
Also published as: AU8770191A

Description

39769 GEH:PFB 6 4 92 8 1 P/00/0 11 Regulatior 3.2

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

ORIG~INAL

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aeof Applicant:V ICj_ Deal ofAscaeSrvsoal.pia! s LEE Autala Paen AplctoSo K24Dae t oebr109 Th folwn ttmnS.afl dsrpino hsivnin AncldEW ReD NOMNEE Petho LTpromigiDnonts This invention relates to a builders lifting jack or hoist, and is more particularly concerned with the lifting of components or elements used in the construction of buildings, such as beams, trusses and the like.

In the construction of buildings it is often necessary to position components or elements of the building in position and to maintain the position while the component or element is fastened or otherwise permanently located in position. The elements or components can be beams, lintels, prefabricated trusses, or other members and which are often not only heavy in weight, but 1 0 also are of a dimension and size which is difficult to manually handle. Often in the manipulation of such elements a plurality of persons is often required specifically for that task while for other tasks such a number of persons is not required.

1 5 It is an object of this invention to provide a lift or jack or hoist suitable fL use in the building industry.

It is a further object of the invention to provide a jack which for use in the interior of the building and which jack can be easily moved and positioned as S 20 required.

S*0o It is a still further object of the invention to provide a jack which is adjustable in several degrees of freedom so that the element, structure, beam or the like can be easily and accurately positioned for permanent location in the building.

Thus there is provided according to the invention a lifting jack or hoist, comprising a base, an upstanding tubular member on the base, a load support member vertically slidable on the tubular member, and also rotatable about the tubular member, said support member having means whereby a load S 30 supported thereon can be moved in a horizontal direction.

In order to more clearly describe the invention reference will now be made to the accompanying drawings in which: FIGURE 1 is a front elevation of the lifting portion of the jack; FIGURE 2 is a side elevation thereof; FIGURE 3 is a cross sectional view of portion of the invention along the lines A-A of Figure 1; and FIGURE 4 is a view of portion of the base.

Referring firstly to Figure 4 of the drawings, the hoist includes a base 1 having a lower base member 2 and an upper base member 3, each of which extends at right angles to each other and each of which is telescopic. The upper base member has telescopic arms 3A at the end of each of which are depending 1 0 feet 4. The base member 2 rests on the supporting surface, and also has telescopic arms 2A. Thus the telescopic arms 2A and 3A can be extended to thus form a cross shaped base having great stability. The base 1 supports a vertical circular tubular post 5, stabilizing arms 6 extending between the base and the post to rigidly support the post in the vertical position.

Referring now to Figure 1, the hoist includes a load support member 7 slidably positioned and lockable in position on the post 5, the load suppot member 7 is slidably positioned and lockable on the post 5, the member 7 having a Ushaped portion 8 having arms 9 and 10, the post 5 passing through holes in 20 the arms 9 and 10. Within the U-shaped member there are a pair of jack"Ig members 11 and 12 each passing over the post 5 with a fit that has slight clearance. The lower jacking member 12 rests on a compression spring 13 on the lower arm 10, and also to this lower jacking member 12 there is pivoted a jacking lever 12a having a nose 14 to engage a roller 15 positioned on the 25 upper jacking member 11. Each of 'the jacking members 11 and 12 have a slot to engage on a rib 16 on the interior of the U-shaped pc-tion 8 to prevent the rotation of these jacking members relative to each other and relative to the U-shaped portion 8. As the arms 9 and 10 of the load support member 7 and also the jacking members 11 and 12 are slidable on the post 5, the load S 3 0 support member as well as being vertically slidable on the post, can also be rotated around the post so that the load support member 7 can be positioned as desired. The arm 9 has a pressure member 9A to engage the top surface of the jacking member 11, this pressure member being spaced from the post so that the pressure exerted by the load support member and any load placed thereon will tilt the utipper jacking member so that the upper jacking member will frictionally lock onto the post. Thus on downward movement of the lever, the nose 14 will raise to engage the roller 15 to thus raise and tilt the upper jacking member 11 and thus the load support member 7, the upper jacking member sliding up along the post 5. On movement of the lever in the upward direction the upper jacking member will lock on the post and the spring 13 will raise the lower jacking member 12 up to the operative position immediately below the upper jacking member 11. It will be realized that the thickness of each of the jacking members is such that on tilting of the jacking members the locking will take place.

Thus it will be seen that as the jacking members have a slight clearance on the post, each can tilt slightly on the post and thus frictionally engage on the post. Thus it will be seen that on operation of the handle each of the jacking members is alternately tilted and raised so that the load support member can be raised to the precise location position. The upper jacking member has a handle which can be used to move the upper jacking member to the free position so that the load support member can be quickly raised to the 1 5 approximate position at which position the member, such as a beam 17 can be positioned thereon.

Q0 0000 The load support member also has a carriage 18 to support the load, and the carriage has at one end a roller 19 and at the other end a roller 20. The roller 0. 20 20 is adapted to be rotated by a handle 21 which has a spring loaded plunger 9 404 o22 to engage in a selected hole 23 in a locking plate 24.

@0 Thus when a load, such as beam 17 is positoned on the rollers 19 and rotation of the handle will move the beam longitudinally for accurate 25 positioning as desired.

ooooe S S•While the above describes the raising and lowering of the load support member by the mechanical action through the manual operation of the handle, it is to be realised that the load support member can be raised and lowered on the post in another manner. Thus the load support member can be raised and lowered hydraulically by means of a hydraulic cylinder. The body of the cylinder can be attached to the base, and the piston rod connected to the load support member. To enable the load support member to pivot about the post, the piston rod can be attached a ring freely rotatable on the load support member.

Thus in another embodiment of the invention the post need not be circular but can be in the form of a beam, for example an I beam. A slider can be fitted to the I beam with the load support member rotatable on the slider. The hydraulic ram can act between the slider and the I beam. If desired to preclude the requirement of a hydraulic cylinder with a long stroke, the cylinder can be positioned in the channel of the I beam, and be releasably positioned by bolts, pegs or the like through holes in the I beam.

Hence it will be seen that there is provided a lift, hoist or jack particularly suitable for the building industry which is simple to operate and which can accurately position a building component by being vertically adjustable, be 1 0 able to pivot about the vertical post, and the load can be longitudinally positioned for accurate alignment.

Although ,ne form of the invention has been described in some detail, the invention is not to be timited thereto, but can include variations and 1 5 improvements falling within the spirit and scope of the invention.

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Claims

1. A lifting jack or hoist, comprising a base, a vertical support post attached to the base, a load support member rotatable and vertically slidable on the vertical post, locking means for locking the load support member on the vertical post, said support member having positioning means whereby a load supported thereon can be moved in a horizontal direction.

2. A lifting jack or hoist as defined in claim 1, wherein the base is cross shaped with extending arms, each of the arms being telescopic so that when extended a stable base is provided.

3. A lifting jack or hoist as defined in claim 1 or claim 2, wherein the load support member has a pair of vertically spaced parallel arms, a hole in each 1 5 arm, said holes being aligned with the post passing through said aligned holes, said locking means positioned between the said spaced parallel arms.

4. A lifting jack or hoist as defined in claim 3, wherein said locking means comprise a pair of jacking members each having a hole through which the 20 post passes with a fit that has slight clearance such that on relative tilting of the see jacking members the jacking members lock onto the post, the jacking S"members being positioned one above the other.

A lifting jack or hoist as defined in claim 4, wherein a jacking lever is 25 pivoted to the lower jacking member, the lever having a nose to engage a ,t S roller on the lower surface of the upper jacking member, whereby on operation of the lever the lever causes the upper jacking member to raise and with it the support member, and on cessation of movement of the lever, the upper arm of the load support member by engaging the upper jacking member 30 spaced from the vertical post, the upper jacking member tilts to lock on the .16. 60 post.

6. A lifting jack or hoist as defined in claim 5, wherein there is provided a spring between the lower surface of the lower jacking member and the lower arm of the load support member.

7. A lifting jack or hoist as defined in any one of the preceding claims wherein the load support member includes a carriage to support a load I 7 positioned thereon, said carriage including a pair of rollers to support the load, one of the rollers having drive means whereby the roller may be turned to thus position the load as desired.

8. A lifting jack or hoist as defined in claim 7, wherein the drive means is a manually operated handle connected to said one roller.

9. A lifting jack or hoist substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings. Dated this 8th day of November 1991 ANDREW REID NOMINEES PTY. LTD. By their Patent Attorneys, 1 5 COLLISON CO. 0 i 0 e Re. 0 0 f. ftf ABSTRACT A builders lifting jack or hoist for lifting building elements and materials for positioning in the building. The jack has an extendable base, and a load support member slidable on a post on the base. The load support member has rollers for laterally positioning the load supported thereon. I O* **o *8 O• O a SO