GB2133103A

GB2133103A - Threaded socket for embedding in concrete

Info

Publication number: GB2133103A
Application number: GB08331333A
Authority: GB
Inventors: Francis Cunningham
Original assignee: Individual
Current assignee: Individual
Priority date: 1982-11-30
Filing date: 1983-11-24
Publication date: 1984-07-18
Also published as: GB8331333D0; ZA828788B; GB2133103B

Abstract

A threaded socket for embedding in concrete comprising a tubular member (11) open at one end and closed at its opposite end (15) and a load bearing nut (17) encased in said tubular member (11) in proximity to said closed end (15), the central axis of said nut (17) being aligned with axis of the tubular member (11) and means (23, 25) being provided for securing the open end of the tubular member (11) to concrete formwork (21); the means (23, 25) may be replaced by a bolt extending through the formwork and into the nut (17). <IMAGE>

Description

SPECIFICATION Attachment for concrete This invention relates to a threaded socket and in particular to the efficient fixing to concrete elements.

In the past it has been necessary to drill into concrete and use special expansion bolts in order to have some load bearing capabilities.

A!ternatively specially made bolts are cast into the concrete with their threaded portions exposed which results in damage to the thread and a hazard to all construction workers. If the precast bolts are not in the ideal position the protruding shaft must be removed by cutting with a blade or welding flame and a fresh bolt placed in the correct position by drilling and use of expansion bolts or the like.

One of the objects of this invention is to provide a means whereby a large number of threaded sockets can be cast in the concrete floor with no protrusions above the level of the concrete. A greatly increased number of location points can therefore be established in any given floor area.

Specifically, the invention resides in a threaded socket for embedding in concrete comprising a tubular member open at one end and closed at its opposite end and a load bearing nut encased in said tubular member in proximity to said closed end, central axis of said nut being aligned with axis of the tubular member and means for securing the open end of the tubular member to concrete formwork.

In another form the invention resides in a method of fixing to concrete elements comprising the locating of a threaded socket to concrete formwork, said threaded socket being a tubular member one open end of which is secured to the formwork and the opposite end of which is closed, said tubular member having a load bearing nut encased therein and located in proximity to said closed end, concrete pour encasing the threaded socket and allowed to set. Upon removal of said formwork the securing means are removed from the open end of the tubular member to leave the threaded socket firmly embedded in the concrete element.

The invention will be better understood by reference to the following description of one specific embodiment as shown in the accompanying drawings wherein: Fig. 1 is a sectional side elevation with securing means and formwork shown; Fig. 2 is a sectional view of Fig. 1 with formwork removed; Fig. 3 is a sectional side elevation as shown in Fig. 1 with a slightly different threaded socket member; Fig. 4 is a view of Fig. 3 with formwork removed; Fig. 5 is a third variation of securing the threaded socket to formwork; and Fig. 6 is a view of Fig. 5 with formwork removed.

In the embodiment shown in Figs. 1, 2, 3 and 4 of the drawings a threaded socket for embedding in concrete is constructed comprising a tubular member 11 open at one end 1 3 and closed at its opposite end 1 5. A load bearing nut 1 7 is encased in said tubular member 11 in proximity to the closed end 1 5. The central axis of the nut 1 7 corresponding with the axis of the tubular member 11 and means 19 for securing the open end 13 of the tubular member 11 to the concrete formwork 21. The securing means shown in Figs. 1-4 inclusive of the drawings being a bolt 1 9.

In Figs. 5 and 6 of the drawings the securing means comprises a plastic (or similar) mounting cap 23 which is screwed 25 to the formwork shuttering or mould 21. The mounting cap 23 is provided with an outwardly projecting shaft 27 to receive the open end 1 3 of the tubular member 11.

In use the threaded socket is secured to the framework 21 as shown in Figs.1,3 or 5 of the drawings. The concrete 29 is poured to completely encase the threaded socket. When the concrete has set it is normal procedure to remove the formwork or shuttering. In the removal of the formwork shown in Figs. 1 and 3 of the drawings, bolt 1 9 must of course be removed before it is possible to remove the formwork. When the formwork has been removed the threaded socket remains in the concrete as shown in Figs. 2 and 4.

In Figs. and 6 removal of the formwork 21 automatically removes the mounting cap 23 and shaft 27 from contact with the threaded socket.

The mounting caps 23 can be then unscrewed from the formwork and reused.

This method of fixing to concrete elements means that a plurality of threaded sockets can be cast in situ for use at any time. When not required the open end 13 of the tubular members 11 may be suitably capped (not shown) to provide an even level surface 31.

Encasing the load bearing nut in plastic ensures the elimination of bi-metallic action, corrosion and the staining of the concrete.

1. A threaded socket for embedding in concrete comprising a tubular member open at one end and closed at its opposite end and a load bearing nut encased in said tubular member in proximity to said closed end, central axis of said nut being aligned with axis of the tubular member and means for securing the open end of the tubular member to concrete formwork.

2. A threaded socket for embedding in concrete as claimed in claim 1 wherein the securing means comprised a threaded bolt.

3. A threaded socket for embedding in concrete as claimed in Claim 2 wherein said tubular member is formed from plastic.

4. A threaded socket for embedding in concrete as claimed in Claim 1 wherein the securing means comprises a mounting cap screwed to the formwork, said mounting cap being provided with an outwardly projecting shaft and adapted to receive the open end of the tubular member.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Attachment for concrete This invention relates to a threaded socket and in particular to the efficient fixing to concrete elements. In the past it has been necessary to drill into concrete and use special expansion bolts in order to have some load bearing capabilities. A!ternatively specially made bolts are cast into the concrete with their threaded portions exposed which results in damage to the thread and a hazard to all construction workers. If the precast bolts are not in the ideal position the protruding shaft must be removed by cutting with a blade or welding flame and a fresh bolt placed in the correct position by drilling and use of expansion bolts or the like. One of the objects of this invention is to provide a means whereby a large number of threaded sockets can be cast in the concrete floor with no protrusions above the level of the concrete. A greatly increased number of location points can therefore be established in any given floor area. Specifically, the invention resides in a threaded socket for embedding in concrete comprising a tubular member open at one end and closed at its opposite end and a load bearing nut encased in said tubular member in proximity to said closed end, central axis of said nut being aligned with axis of the tubular member and means for securing the open end of the tubular member to concrete formwork. In another form the invention resides in a method of fixing to concrete elements comprising the locating of a threaded socket to concrete formwork, said threaded socket being a tubular member one open end of which is secured to the formwork and the opposite end of which is closed, said tubular member having a load bearing nut encased therein and located in proximity to said closed end, concrete pour encasing the threaded socket and allowed to set. Upon removal of said formwork the securing means are removed from the open end of the tubular member to leave the threaded socket firmly embedded in the concrete element. The invention will be better understood by reference to the following description of one specific embodiment as shown in the accompanying drawings wherein: Fig. 1 is a sectional side elevation with securing means and formwork shown; Fig. 2 is a sectional view of Fig. 1 with formwork removed; Fig. 3 is a sectional side elevation as shown in Fig. 1 with a slightly different threaded socket member; Fig. 4 is a view of Fig. 3 with formwork removed; Fig. 5 is a third variation of securing the threaded socket to formwork; and Fig. 6 is a view of Fig. 5 with formwork removed. In the embodiment shown in Figs. 1, 2, 3 and 4 of the drawings a threaded socket for embedding in concrete is constructed comprising a tubular member 11 open at one end 1 3 and closed at its opposite end 1 5. A load bearing nut 1 7 is encased in said tubular member 11 in proximity to the closed end 1 5. The central axis of the nut 1 7 corresponding with the axis of the tubular member 11 and means 19 for securing the open end 13 of the tubular member 11 to the concrete formwork 21. The securing means shown in Figs. 1-4 inclusive of the drawings being a bolt 1 9. In Figs. 5 and 6 of the drawings the securing means comprises a plastic (or similar) mounting cap 23 which is screwed 25 to the formwork shuttering or mould 21. The mounting cap 23 is provided with an outwardly projecting shaft 27 to receive the open end 1 3 of the tubular member 11. In use the threaded socket is secured to the framework 21 as shown in Figs.1,3 or 5 of the drawings. The concrete 29 is poured to completely encase the threaded socket. When the concrete has set it is normal procedure to remove the formwork or shuttering. In the removal of the formwork shown in Figs. 1 and 3 of the drawings, bolt 1 9 must of course be removed before it is possible to remove the formwork. When the formwork has been removed the threaded socket remains in the concrete as shown in Figs. 2 and 4. In Figs. and 6 removal of the formwork 21 automatically removes the mounting cap 23 and shaft 27 from contact with the threaded socket. The mounting caps 23 can be then unscrewed from the formwork and reused. This method of fixing to concrete elements means that a plurality of threaded sockets can be cast in situ for use at any time. When not required the open end 13 of the tubular members 11 may be suitably capped (not shown) to provide an even level surface 31. Encasing the load bearing nut in plastic ensures the elimination of bi-metallic action, corrosion and the staining of the concrete. CLAIMS

5. A threaded socket for embedding in concrete as claimed in claim 4, wherein the mounting cap projecting shaft and tubular member are formed of plastic.

6. A threaded socket substantially as herein described with reference to the accompanying drawings.

7. A method of fixing to concrete elements comprising the locating of a threaded socket to concrete formwork, said threaded socket being a tubular member one open end of which is secured to the formwork and the opposite end of which is closed, said tubular member having a load bearing nut encased therein and located in proximity to said closed end, concrete pour encasing the threaded socket and allowed to set. Upon removal of said formwork the securing means are removed from the open end of the tubular member to leave the threaded socket firmly embedded in the concrete element.

8. A method of fixing to concrete elements as claimed in claim 7 wherein the securing means comprises a threaded bolt.

9. A method of fixing to concrete elements as claimed in Claim 7 wherein the securing means comprises a mounting cap screwed to the formwork, said mounting cap being provided with an outwardly projecting shaft and adapted to receive the open end of the tubular member.

10. A method of fixing to concrete elements as claimed in Claim 8 or Claim 9 wherein the said tubular member is formed of plastic.

11. A method of fixing to concrete elements as claimed in Claim 9 wherein the mounting cap and projecting shaft are formed of plastic.

12. A method of fixing to concrete elements substantially as herein described with reference to the accompanying drawings.