EP0678472B1

EP0678472B1 - Universal hooking system for the lifting of concrete products

Info

Publication number: EP0678472B1
Application number: EP95105557A
Authority: EP
Inventors: Federico Pignoni
Original assignee: LANCHEM SpA
Current assignee: LANCHEM SpA
Priority date: 1994-04-19
Filing date: 1995-04-12
Publication date: 1999-08-11
Anticipated expiration: 2015-04-12
Also published as: ES2138103T3; DE69511312D1; EP0678472A2; ATE183172T1; EP0678472A3

Abstract

Anchor bolt hooking system to fix into a concrete product, of the blade type (2) with external end endowed with at least two opposite lateral shoulders, substantially orthogonal (20), and with at least one hooking hole (22) on the outside of the fixing surface of the concrete product, in order that in said hole (22), by means of a "U" carved joint (1202), a hooking ring of the product (12) can be inserted endowed with means (1202) that prevent the rotation in said hole to force it to remain always in line with the axis of said anchor bolt, characterized in that said ring, in the orthogonal direction to said "U" joint (1202), has a widening (120) that forms a stop (1203) with said supporting shoulders (20) of said anchor bolt (2) at least on one side. <IMAGE>

Description

This invention has for object a universal hooking system or articulated hoisting shackle for the lifting of concrete products.
At the present state of the art different hooking systems for the lifting of concrete products are known, which consist in anchor bolts that are fixed into the concrete product, the extremity of which protrude from the surface of the product (eventually re-entering by means of recess) with a respective hooking head that may be:

of stake type as in the solution Arteon e.g. PCT/FR93/00934; PCT/FR89/00365; FR-93-09892; FR-89-08767;
or blade type as in the solutions FRIMEDA IT-987738; or IT-1086195 (see also FRIMEDA AT-B-328 665 having the same figures as IT-987738).

In particular, the above FRIMEDA solutions and in the FRIMEDA solution IT-1086195 anchor bolts or clamps fixed into the cement as above mentioned, are described and claimed, which have, over a central hook hole, a raised central bridge head over said hole, and on one side and/or the other an overhanging stop tooth that protrudes over said raised central bridge and in which this tooth has a supporting surface for the ring to hold upright, the surface of which is oriented perpendicularly to the axis of the anchor.
The stop surface of this tooth (ref. 14 in the claim) is therefore parallel to the axis of the anchor, as indicated in the respective drawings as well.
This parallelism is reported both in the case of a lateral tooth (Fig.3 IT-1086195,) than that of a central tooth (Fig.11 of the IT-1086195).
The central tooth solution (Fig.11) is the most disadvantageous one.
However, independently from the position of the tooth, a solution so conceived, involves the fact that its stop surface, oriented orthogonally to the longitudinal axis (parallel to said axis), determines a heavy stress which is also orthogonal to the longitudinal axis, therefore at pure cutting edge, consequently said tooth may be easily cut off.
Furthermore in this solution the sidewalls have the form of tilted shoulders and do not contribute to supporting the hooking ring to maintain it upright.
The lateral tooth solution is better than the central tooth one, but presents the drawback that the lateral tooth can be easily burred, that is deformed on the outer side, not having other support than that of the concrete edge that fixes it immediately under the surface.
The aim of the present invention is to obviate the above-mentioned drawbacks.
This and other aims are being reached as claimed by means of an anchor hooking system to fix into a concrete product to lift it, comprising :

an anchor blade for insertion into the concrete of the product to be lifted, having a longitudinal axis and at least one hooking hole intended to be positioned out from the fixing surface of the concrete product, in order that a lift hooking ring can be inserted in said hole, the end adjacent said hooking hole being endowed with at least two opposite, lateral, supporting shoulders, substantially orthogonal to the longitudinal axis of the anchor blade;
an articulated hoisting shackle of the type having :
a connecting element and an openable latch hooking ring having a housing and a hooking element slidable therein;
the connecting element being meshed with said openable ring and the openable ring being able to hook said anchor blade by engaging said hooking element through said hooking hole;
wherein said openable ring has a recess for engaging the head of said anchor blade to prevent rotation, forcing the ring to remain always in line with the axis of said anchor blade,
characterized in that said housing has an increased width portion in the region of the recess to form a shoulder extending perpendicularly to the plane of the ring for abutment with said supporting shoulders of said anchor blade at least on one side and the recess is trapezoidal in shape to engage a respective trapezoidal extension of the anchor blade.

In this way the ring must remain necessarily upright at least on the side of the stop on the respective shoulder, while it may be rotated in the opposite direction.
Advantageously, said increased width portion to form a shoulder is made on both sides therefore the supporting shoulders are operable be it on one side and on the other.
This solution is interesting for side lifting with a straight ring on one side and orientable on the other, obviously with greater traction efficacy.
In this way the ring is necessarily forced to remain upright in both the directions.
Thanks to said tilted surfaces of the central protruding trapezoidal tooth, the stress force by rotation of the ring is contrasted by said tilted surface with a stress caused substantially by compression, whereupon the shearing by cutting may be avoided.
These and other advantages will appear from the following description of preferential solutions for realisation, with the help of enclosed drawings where the execution details are not to be considered limiting but only supplied as an example.
Fig. 1 is a view of the hooking system of a loose hooking ring to the anchor bolt, formed by two rings, the first an openable hooking to the anchor bolt and the second closed in order to be hooked by the hoisting hook of a crane, for example.
Fig. 2 is a side view of the system of Fig. 1, where one clearly notes the joint tooth of the anchor bolt inside said first openable hooking ring, so that it is forced to remain always upright, while the second ring can rotate.
Fig.3 is a view of Fig. 2 in which the second ring has been rotated so that it undergoes a traction of the concrete product substantially parallel to its surface, while said openable first ring is forced to remain always upright, that is orthogonal to the surface of the concrete product (parallel and in line with the axis of the anchor bolt).
Figures 4 and 5 represent the frontal and side view of the anchor bolt fixing according to the present solution.
Making reference to the drawings we note that 1 indicates the loose ensemble ring and 2 the anchor bolt.
The anchor bolt 2 is of blade type and the feet are divaricated for the fixing into the concrete and has internal holes (24) for the passage of iron in the concrete and recesses (23) for the clamping between irons fixed into the concrete.
This conformation, as from known technique, helps to maintain the anchor bolt steadily fixed into the concrete of the product that must be lifted.
The anchor bolt has an upper extremity that generally comes out from the surface of fixation into the concrete (in a shell so that it does not protrude) which has an ovoid hole (22) in order to favour the insertion of the latch hook of the ring that for this purpose can also advantageously be in elongate section, thereby improving the traction resistance and helping to resist against the rotation in said hole.
Finally the anchor bolt terminates on the upper surfacewith a central tooth, having a trapezoidal form (21) while the shoulders (20) remain orthogonal to the axis of the anchor bolt (2), serving as further support for the first hooking ring.
The loose ensemble ring (1) includes an openable ring (12) that hooks, with a rotatable latch (121) within a semicircular sheath (120), both the anchor bolt by means of its hole (22) and a second handle ring (11) that instead can rotate on the first.
The first openable hooking ring (12) contains the rotatable latch (121) within a semi-annular sheath (120), opened on the lower side with a notch (1202) of width equal to the thickness of the blade of the anchor bolt, in order that it can be inserted when latch (121) is drawn in, and so that the hole of the sliding sheath of the latch and the hooking hole of the anchor bolt (22) coincide.
Once in this position, said latch may be rotated passing through the hole of the anchor bolt (22), thereby hooking it.
We note that the sheath (120) has a toroidal upper semi-ring narrower on the upper side (1201) that for 180° can allow the free rotation of the second ring (11) that will be able to be hooked by a crane over the concrete surface of the product.
According to the present solution, the sheath of the first ring (21) has:

besides a recess for the perfect embedding of the isosceles trapezoidal force of said tooth (21),
also two opposite lateral stops (1203) that rest on the surfaces of said shoulders (20) of said anchor bolt.

In this way the anchor bolt is maintained upright against lateral stresses much more effectively, by force of traction "F" (Fig.3). The anchor bolt illustrated in Fig. 3 is shown with said trapezoidal extension or tooth (21), with the presence of shoulder shaped orthogonal stop endings (20).

Claims

Anchor hooking system to fix into a concrete product to lift it, comprising :

an anchor blade (2) for insertion into the concrete of the product to be lifted (26), having a longitudinal axis and at least one hooking hole (22) intended to be positioned out from the fixing surface of the concrete product, in order that a lift hooking ring (1) can be inserted in said hole (22), the end adjacent said hooking hole being endowed with at least two opposite, lateral, supporting shoulders (20), substantially orthogonal to the longitudinal axis of the anchor blade;

an articulated hoisting shackle (1) of the type having :

a connecting element (11) and an openable latch hooking ring (12) having a housing and a hooking element (121) slidable therein;

the connecting element (11) being meshed with said openable ring (12) and the openable ring being able to hook said anchor blade (2) by engaging said hooking element through said hooking hole (22);

wherein said openable ring (12) has a recess (1202) for engaging the head of said anchor blade (2) to prevent rotation, forcing the ring to remain always in line with the axis of said anchor blade (2),
characterized in that said housing has an increased width portion in the region of the recess to form a shoulder extending perpendicularly to the plane of the ring for abutment (1203) with said supporting shoulders (20) of said anchor blade (2) at least on one side and the recess is trapezoidal in shape to engage a respective trapezoidal extension (21) of the anchor blade (2).
An articulated hoisting shackle (1) of the type having :

a connecting element (11) and
an openable latch hooking ring (12) having a housing and a hooking element (121) slidable therein;

the connecting element being meshed with the openable ring and the openable ring being able to hook a product to be lifted by sliding the hooking element within the housing (121) and into engagement with the product;

wherein said openable ring has a recess (1202) in said housing for engagement with a head of an anchor blade (2) to prevent rotation, forcing it to remain always in line with the axis of said anchor blade (2) and prevent rotation laterally of the ring around said hooking element, characterized in that said openable latch hooking ring (12) has an increased width portion in the region of the recess to form a shoulder (1203) extending perpendicularly to the plane of the ring for abutment with at least one corresponding shoulder on the product, the recess being trapezoidal in shape to engage a respective trapezoidal extension (21) of the anchor blade (2).
A system according to claim 1, characterized in that said increased width portion (120) in said latch hooking ring (12) extends on both sides to prevent rotation to both sides.
An articulated hoisting shackle (1) according to claim 2, characterized in that said increased width portion (120) in said latch hooking ring (12) extends on both sides to prevent rotation on both sides.
Hoisting shackle as defined in claim 2, characterized in that said housing has a semi-annular sheath (120).
Hoisting shackle as defined in claim 5, characterized in that said increased width is to both sides thereby forming a stop (1203) in order to rest on the corresponding shoulder (20) on both sides of a said anchor blade.
An anchor blade (2) for use in an anchor hooking system as claimed in claim 1, having a central fitting tooth (21) to fit into said recess (1202), characterized in that said central tooth (21) over said hole (22) in said anchor blade (2), has the lateral surfaces tilted (211), substantially forming a trapezoidal central isosceles protrusion, of which the longer parallel side forms the base with rectilinear shoulders (20) extending laterally on one side and on the other orthogonal to the axis of the anchor blade and along its entire width, on which shoulders the corresponding lateral shoulders (1203) of said first ring (12) can rest.