[0001] The present invention concerns a device for the quick blocking and release of tubolar
handles consisting in at least two rods or sectional portions that can be engaged
one with the other, particularly concerning broom handles, brush handles and generally
handles for manual use equipment of any kind.
[0002] It is well knwon that the handles for brooms, brushes and similar cause, due to the
length thereof, a considerable encumbrance for transport and storage.
[0003] Consequently, said handles are actually devided in a plurality of portions that can
be assembled when the rod is to be used due to the engagement of one portion with
the other.
[0004] Furthermore, said engagements, that are of the telescopic-friction, screw and joint
kind, don't allow a safe and lasting blocking of the portions during the use, due
to the considerable torsional stress said portions undergo.
[0005] It is therefore the aim of the present invention to realize a blocking and releasing
device by means of which the disadvantages and imperfections of those according to
the prior art are eliminated.
[0006] Some of the already known devices provide that it is impossible to remove the rods
once they have been engaged; and this means that the user has no longer the possibi
- lity of reducing the encumbrance of the handle. It is a further aim of the present
invention to allow, besides the blocking, also the release of the various rods or
portions.
[0007] In the field of the technical tasks it is the aim of the present invention to solve
above mentioned problems realizing an easy structure, of a relatively easy realization,
of safe use and efficient functioning, as well as not very expensive at all.
[0008] Said aims are reached by means of the device, according to the present invention,
for quick blocking and releasing of tubolar handles realized in at least two engageable
rods, the first rod having the engaging end of a diameter partially reduced for engagement
in the second rod, characterized in that an insert is bound axially and rotatory to
said end with reduced diameter, said insert showing an axial extension provided with
a tapered truncated-cone shaped portion, outwardly threaded, onto which an expansible
bush may be screwed, said bush having a truncated-cone shaped part engaged with said
insert portion and the outer surface able to adhere to the inner wall of the second
rod so as to rotatory engage with the same for determining, with the rotation of the
first rod and the screwing of the bush, the consequent expansion due to the widening
action performed by the conical portion against the inner truncated-cone shaped part
of the bush, and the consequent blocking of the rods.
[0009] Further details will become clearer and more evident refering to the detailed description
of a prefered embodiment, which is not exclusive, of the device according to the present
invention, shown for exemplifying but not limiting purposes in the attached drawing,
in which:
figure 1 shows a partial lateral section view with a diameter plane of a device according
to the present invention, assembled in two rods or portions;
figure 2 shows a lateral view of the same device.
[0010] Refering to said figures, the device according to the present invention for the quick
blocking and releasing of tubolar handles out of at least two portions or rods A and
B, preferably hollow and engageable, is generally shown.
[0011] Rod A shows the engaging end 1 having, for a part, a reduced diameter for the engagement
with rod B.
[0012] The device comprises an insert 2 showing a cylindrical portion 3 that can be forced
into end 1 of rod 1 for being axially and rotatory bound therein by means of punchings
4; portion 3 widens with a set-back 5 that acts as a rest against the opening of end
1.
[0013] Portion 3 shown an axial outward extension to rod A, in which a portion 6, truncated-cone
shaped and tapered, is defined, outwardly showing a threading 7; portion 6 further
extends in a peg 8 structure A, ending in a tablet 12 of greater dimensions; insert
2 is advantageously realized out of one single piece by pressing of material of the
kind of plastic.
[0014] On portion 6 a bush 10 is mounted, outwardly showing a cylindrical surface for rotatory
engagement against the inner surface of rod B, ending in a short conical part 11 for
facilitating the engagement in said rod B; the bush 10 inwardly shows a truncated-cone
shaped and threaded part 12; the bush shows a fissure 13 that cuts all the length
thereof, due to the material out of which the bush is realized and that is preferably
of the plastic kind, the widening of said bush.
[0015] The working of the device according to the present in - vention is evident: when
end 1 of rod 1 has been inserted into rod B, bush 10 being placed in correspondence
to peg 8, it will be sufficient to rotate the rods one in respect to the other so
as to determine - due to the screwing of the truncated-cone shaped portion 12 of the
bush on the truncated-cone shaped portion 6 of the in - sert - the widening of said
bush that expands in rod B so as to reciprocally bind the rods; for releasing the
rods it will be sufficient to make the same rotate in the opposite sense.
[0016] It should be noted that at the beginning of the screwing, the bush remains substantially
adherent to rod B due to the friction of the materials and that keeping up the screwing
said adherence increases together with the deformation of the bush; it should also
be noted that the greater the effort for screwing the parts, the greater the torsional
seal of the coupling - that means: if during the use of the handle the rods will be
solicited one with respect to the other torsionally in the sense of release, it will
be sufficient - for avoiding the release - to screw the rods stronger at the time
of assembling.
[0017] It is evident that, according to the different needs, the handle may be realized
in any number of parts and any diameter of the rods and of the device.
[0018] It has been shown how the object of the present invention meets the purposes set
forth and, in particular, how the same allows the quick coupling and release of a
plurality of rods, with a device of a very low cost due to the sim- p
licity, the realization material and the low number of operations to be performed in
the realization stage (diameter reduction of rod 1 and fixing punching 4).
[0019] The object of the present invention may be varied and modified without therefore
going out of the limits of the present invention. Furthermore, all details may be
replaced by others which are technically equivalent.
1. A device for the quick blocking and release of tubolar handles consisting in two
or more sectional portions, wherein the first rod or portion (A) has the engaging
end of a diameter.partially reduced for engagement with the second rod or portion(B),characterized
in that an insert (2) is bound axially and rotatory to said end (A) with reduced diameter,
said insert showing an axial extension (3) provided with a tapered truncated-cone
shaped portion (6), outwardly threaded (7), onto which an expansible bush (10) may
be screwed, said bush having a truncated-cone shaped part (12) engaged with said insert
portion (6) and the outer surface able to adhere to the inner wall of the second rod
(B) so as to rotatory engage with the same for determining, with the rotation of the
first rod (A) and the screwing of the bush (10), the consequent expansion due to the
widening action performed by the conical portion (6) against the inner truncated-cone
shaped part (12) of the bush, and the consequent blocking of rods (A) and (B).
2. A device according to claim 1, characterized in that the free end (6) of said insert
(2) projexts with a peg (8) ending in a widened tablet for the support of said bush
(10) in releasing.
3. A device according to claim 1, characterized in that said bush (10) shows a longitudinal
fissure (13) that allows the radial deformation thereof.
4. A device according to claim 1, characterized in that the binding of said insert
(2) to said end with reduced diameter of rod (A) is obtained by means of punching
(4) of the rod on the reduced diameter end of insert (2), in - serted in said rod
(A).
5. A device for the quick blocking and release of tubolar handles consisting in two
or more sectional portions according to one or more of the precedent claims and according
to what has been described and illustrated for the set-forth purposes.