Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Spacer-positioner; e.g. – rebar chair
Reexamination Certificate
1996-01-30
2001-01-30
Friedman, Carl D. (Department: 3635)
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Spacer-positioner; e.g., rebar chair
C052S365000, C052S684000, C404S135000, C404S136000
Reexamination Certificate
active
06178716
ABSTRACT:
FIELD OF THE INVENTION
The present invention is related to a fitting used in a building site. Particularly, the present invention is related to a fitting which combines both the functions to space the reinforcement rod from a shuttering frame for forming a reinforced-concrete floor slab of a building a predetermined distance, and to indicate the thickness that the floor slab should obtain after concrete slurry is poured onto the shuttering frame and hardened thereon.
BACKGROUND OF THE INVENTION
Conventionally, when constructing a reinforced-concrete building, spacers in the form of cement blocks are used to space reinforcement rods from the shuttering frame for forming a floor slab of the building a distance thereby to enable the floor slab to have an optimal strength.
Also, indicators are used for workers to easily perceive what is the thickness that the floor slab is intended to obtain so that they can decide when to stop the pouring of the concrete slurry into the shuttering frame.
Since the conventional spacers and indicators are individual from each other, to lay them on the shuttering frame is very laborious. Furthermore, since the height of the conventional indicators cannot be easily adjusted, the conventional indicators cannot be easily adapted to different building conditions which respectively require a different thickness for the floor slab.
In view of the disadvantages of the prior art, the present inventor has invented a reinforced-concrete floor slab thickness indicator/reinforcement rod spacer combination
80
(as shown in
FIG. 8
) which combines the indicator and spacer into a single unit, wherein the combination
80
forms a prior art of the present invention.
Referring to
FIG. 8
, the combination
80
consists of an indicator
81
and a spacer
82
fixedly mounted on a base
89
. The indicator
81
comprises an indicating portion
816
, a threaded post
812
fixedly mounted on the base
89
and a first spring
814
connecting the indicating portion
816
and the threaded post
812
together. The first spring
814
can have a movement along the post
812
by rotating the first spring
814
about the post
812
so that the level of the indicating portion
816
may be adjusted to meet different building conditions.
The spacer
82
comprises a rod
83
fixedly connected to the base
89
, a medial portion
85
slideably mounted on the rod
83
, a second spring
84
has a first end seated on the base
89
and a second end supporting the medial portion
85
, and a supporting portion
86
defining a reinforcement rod receiving recess
87
, the supporting portion
86
being threadedly engaged with the medial portion
85
. By rotating the supporting portion
86
about the medial portion
85
, the level of the supporting portion
86
can be adjusted.
Although the above combination
80
which has a dual function to indicate the floor slab thickness and space the reinforcement rod from the shuttering frame a distance, is proved to be able to function well, it still has some disadvantages which need to be improved.
Among these disadvantages, the first is that to rotate the first spring
814
about the threaded post
812
to move the first spring
814
along the threaded post
812
is not convenient, and further causes the level of the indicating portion
816
to be not easily and quickly adjusted.
Furthermore, since the supporting portion
86
together with the medial portion
85
is only slideably supported on the relatively slim rod
83
by the second spring
84
, the rigidity for supporting the medial and supporting portions
85
,
86
is relatively poor, which results in that the reinforcement rod put on the supporting portion may not be able to be stabilized at its intended location. This situation becomes aggravated particularly when the flow of the concrete slurry poured onto the shuttering frame on which the combination
80
is laid has a violent current. If this situation happens, the reinforcement rod supported by the spacer
82
cannot be retained in its intended position, and, thus, the reinforced-concrete floor slab, which includes the reinforcement rod supported by the spacer
82
will not be able to obtain an optimal strength.
The present invention is disclosed to obviate/mitigate the above mentioned disadvantages of the conventional wooden shuttering frame.
SUMMARY OF THE INVENTION
It is an objective of the present invention to provide a reinforced-concrete floor slab thickness indicator/reinforcement rod spacer combination wherein the level of the indicator can be easily adjusted.
A further objective of the present invention is to provide a reinforced-concrete floor slab thickness indicator/reinforcement rod spacer combination wherein the reinforcement rod can be stably supported by the spacer.
REFERENCES:
patent: 2373284 (1945-04-01), Autrey
patent: 3579938 (1971-05-01), Hanson
patent: 3645002 (1972-02-01), Hefti
patent: 4835933 (1989-06-01), Yung
patent: 1276317 (1968-08-01), None
patent: 2549870 (1985-02-01), None
patent: WO90/01600 (1990-02-01), None
Bacon & Thomas
Friedman Carl D.
Wilkens Kevin D.
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