[0001] The invention refers to a collapsible handle to be used on tools for room cleaning,
such as brooms, brushes of other, which -as a principle- can be mounted without interposition
parts, allows a high resistance when connected and determines a retention effect
apt to carry out a solidarily binding working condition.
[0002] In order to reduce the manufacturing, storage and transport costs, and particularly
in the case of sales by correspondence, the exigency is felt of decomposing the above
lengths in longitudinal parts which can then be compacted in manufacturing according
to encumbrances admitted for despatch by mail and manual transport.
[0003] Some connecting devices are well known which, for the use, show interposition parts
working as activators of binding means. One of these systems uses an automatism with
a spring pivot which, when getting outwards, blocks the connecting parts in binding
seat. In another device, a ring-shaped part is used which can be put in expansion
by rotating in advancement a connecting coaxial part. These systems require rather
high costs and their fragility, with the time, brings to inefficiency or anyhow to
degradation of the means due to the parts disjunction. At present, the conventional
means for directly connecting the parts consists in carrying out a coaxial composibility
by screwing a threaded pin in a spiral seat of the coaxial part. However, when carrying
out the screwing shaping on the sheet tubolar of the coaxial component, its structure
is weakened and, therefore, it is no longer fit to resist to the handle overstressing;
moreover, this system does not allow a sensible retention effect of the parts to disengaging.Since
handles exceeding some thickness cannot be used, as they would be considerably heavy,
this system consequently turn out to be at present unfit.
[0004] Starting from these conventional use techniques, the invention carries out the solution
of the above mentioned problems by adopting a new conception system in carrying out
the screwing seat of the connecting coaxial component. This system avoids the structural
weakening of the said part and determines a balanced retention effect to the conventional
disengaging overstressing on the handle.
[0005] Substantially, the handle can be decomposed in two or more longitudinal lengths
which can be connected by screwing. For connecting the parts, these ones are brought
into direct screwing up to the beating limit of the threaded pin on the axial part
into the corresponding screwing seat with special conformation of the coaxial part.
This seat consists of counterposed sets of screw-shaped lengths, singularly emerging
from the inside wall of the cylindrical structure. The proceeding avoids to weaken
the coaxial part, which would occur if carrying out the complete screwing of this
part; furthermore, by means of the counterposed sets of bombed reliefs, which singularly
press into the helical furrows of the axial body, it performs a permanent balanced
retention effect which tends to perform a solidarily binding condition between the
connection parts. This because the push ing and, therefore, pressing effect of a
bombed part emerging from an inside cylindrical wall is stronger than the one of a
plate structure with helical shaping.
[0006] An execution form is illustrated in a merely indicative way in the drawings of table
1.Referring to this table, fig. 1 represents the detached connecting parts seen from
one side in order to evidence the furrows that inside determine the set of the threading
relief lengths. Fig. 2 is the view of the same components observed from the other
side to point out the relevant other set of threading furrows. In fig. 3 the above
components are in connection. Fig. 4 is the perspective view of the joined connection
terminals as above. Fig. 5 shows a large brush and a broom mounted on handles according
to the present system.
[0007] The version uses components in tubular sheet. Axial pivot 1 with helical threaded
shapes 2 are foreseen and the coaxial part 3 with counterposed threading lengths 4
and 5 emerging from the inside cylindrical wall of the above coaxial component.
[0008] Practically, the form of the shapes, the section and thickness of the connecting
components, the materials, the number of components of the set and anything else in
this connection may be foreseen in different way.
1) Composable handle for room cleaning tools, characterized by the fact that it can
be decomposed in two or more longitudinal parts which can be coaxially connected by
means of screwing. To connect the parts, these ones are brought in direct screwing
by inserting them up to the beating limit of the screwed pin (1) of the axial part
into the corresponding screwing seat, with particular conformation, of the coaxial
part (3). This seat consists of a counterposed set of threaded lengths (4 and 5)
singularly emerging from the inside wall of the cylindrical structure. This proceeding
avoids to weaken the coaxial part (3), what would occur by performing the complete
threading of this part, and furthermore, by adopting the counterposed set of bombed
reliefs, singularly pressing in the relevant furrows of the axial part, assures a
permanent retention effect which tends to perform a solidarily acting binding condition.