[0001] The present invention relates to a high-penetration backhoe bucket for excavators.
[0002] During the use of excavators it is often necessary to produce a breakthrough action
in order to allow the bucket to penetrate for example through a layer of asphalt covering
material or through stratifications of rocky soil which accordingly are mechanically
highly resistant.
[0003] In such cases, before using the conventional bucket, a pointed tool, known as hammer,
is fined to the arm of the excavator instead of the bucket and the machine bites into
the soil with said tool.
[0004] Then, once the hard section has been broken up, the hammer is removed and the bucket
is reinstalled in order to perform the actual excavation by removing the residual
material.
[0005] As an alternative, a pneumatic hammer is used to break up said material, and the
excavator can intervene only thereafter in order to remove the material.
[0006] Such prior art requires substantially complex and time-wasting and accordingly uneconomic
operations, since a number of maneuvers are necessary for the consecutive disassembly
and refitting of at least two tools on the arm of the excavator or requires the intervention
of operators assigned to handling the pneumatic hammers in addition to the working
step for actual excavation performed by the excavator.
[0007] Besides this first problem, conventional backhoe buckets suffer a second problem
which is constituted by the necessity to ensure, during the emptying of the bucket,
that all the loaded material falls out leaving the bucket completely empty.
[0008] Currently, in order to solve this problem transverse partitions are fitted inside
buckets and are fixed to the actuation arm, and the bucket can rotate with respect
to them; these partitions accordingly sweep all of the internal part and drag all
the material towards the front lip.
[0009] This structure is substantially complicated to provide in practice and is in any
case an additional factor in the manufacturing costs of the buckets.
[0010] The aim of the present invention is to solve the above-mentioned problems of the
prior art by providing a high-penetration backhoe bucket for excavators which allows
to eliminate the necessity to use multiple tools in case of mechanically highly resistant
soils or, as an alternative, the auxiliary intervention of pneumatic hammers, and
is at the same time self-cleaning without the intervention of additional devices inside
the bucket.
[0011] This aim and other objects are achieved by a high-penetration backhoe bucket for
excavators, characterized in that proximate to the eyes for coupling to the working
arm of excavators it is rigidly provided with a variable-frequency vibrating assembly.
[0012] Further characteristics and advantages will become better apparent from the following
detailed description of a preferred embodiment of a high-penetration backhoe bucket
for excavators, illustrated only by way of non-limitative example in the accompanying
drawings, wherein:
Figure 1 is a schematic side view, in phantom lines, of the backhoe bucket according
to the invention;
Figure 2 is a corresponding rear view thereof.
[0013] With reference to the above figures, 1 designates a high-penetration backhoe bucket
for excavators which is rigidly provided, proximate to the eyes 2 for coupling to
the working arm of the excavator, with a variable-frequency vibrating assembly 3.
[0014] The assembly comprises a motor 4 whose frame is supported on the bucket 1 by way
of corresponding first means 5 and from which a rotating shaft 6 protrudes; said shaft
also is supported by the bucket by way of corresponding second means 7 and is divided
into three consecutive longitudinal sections: a first proximal one 6a and a third
distal one 6c, which are coaxial to the motor 4, and a second intermediate one 6b,
which is eccentrically axially offset.
[0015] The first means 5 for supporting the frame of the motor 4 on the bucket 1 consist
of a first transverse flange 8 which is rigidly fitted between the brackets 2a that
support the eyes 2 for coupling to the arm of the excavator.
[0016] The second means 7 for supporting the rotating shaft 6 consist of two additional
transverse flanges 9 which are arranged in succession and parallel with respect to
the first flange 8 and are rigidly coupled between the brackets 2a.
[0017] Antifriction means, constituted by respective bearings 10 with low rolling friction,
are interposed between the rotating shaft 6 and the brackets 2a.
[0018] The operation of the present invention can be clearly deduced from the above description:
when the bucket 1 is used for excavation, in the presence of soil with high mechanical
resistance to penetration the motor 4 is activated, turning the shaft 6.
[0019] The intermediate portion 6b of the shaft produces a vibration of the entire bucket
1 which allows the front chisel lip of the bucket to overcome the mechanical resistance
of the soil and penetrate deeply.
[0020] Likewise, during the emptying of the removed material, said induced vibration and
the downward-facing position of the bucket 1 achieve the complete emptying of said
bucket without having to provide partitions or other appendages suitable for the purpose.
[0021] In practice it has been observed that the above-described invention achieves the
intended aim and objects.
[0022] The invention thus conceived is susceptible of numerous modifications and variations,
all of which are within the scope of the appended claims.
[0023] Moreover, all the details may be replaced with other technically equivalent ones.
[0024] In practice, the materials employed, as well as the shapes and the dimensions, may
be any according to requirements without thereby abandoning the protective scope of
the appended claims.
[0025] The disclosures in Italian Patent Application No. MO99A000124 from which this application
claims priority are incorporated herein by reference.
[0026] Where technical features mentioned in any claim are followed by reference signs,
those reference signs have been included for the sole purpose of increasing the intelligibility
of the claims and accordingly, such reference signs do not have any limiting effect
on the interpretation of each element identified by way of example by such reference
signs.
1. A high-penetration backhoe bucket for excavators, characterized in that it comprises,
proximate to the eyes (2) for coupling to the working arm of excavators, a variable-frequency
vibrating assembly (3), connected rigidly thereto.
2. The bucket according to claim 1, characterized in that said vibrating assembly comprises
a motor (4) whose frame is supported on said bucket (1) by virtue of corresponding
first means (5) and from which a rotating shaft (6) protrudes which also is supported
on the bucket (1) by way of corresponding second means (7) and is divided into three
consecutive longitudinal sections, a first proximal one (6a) and a third distal one
(6c) being coaxial to said motor (4), a second intermediate section (6b) being eccentrically
axially offset.
3. The bucket according to claim 2, characterized in that said first means (5) for supporting
the frame of the motor (4) on the bucket (1) are constituted by a first transverse
flange (8) which is rigidly fitted between the brackets (2a) for supporting the eyes
(2) for coupling to the arm of the excavator.
4. The bucket according to claim 2, characterized in that said second means (7) for supporting
said rotating shaft (6) are constituted by two additional transverse flanges (9) which
are arranged in succession and parallel to said first flange (8) and are rigidly coupled
between said eye supporting brackets (2a), antifriction means (10) being interposed
between said rotating shaft (6) and said brackets (2a).
5. The bucket according to claim 4, characterized in that said antifriction means are
constituted by respective bearings (10) with low rolling friction.