U.S. patent application number 14/024862 was filed with the patent office on 2014-03-20 for detachable fastening system between a male piece and a female piece, pin and female piece.
This patent application is currently assigned to METALOGENIA, S.A.. The applicant listed for this patent is METALOGENIA, S.A.. Invention is credited to Jose LOPEZ ALMENDROS, Angel MARTINEZ, Francisco PEREZ SORIA.
Application Number | 20140075793 14/024862 |
Document ID | / |
Family ID | 39788064 |
Filed Date | 2014-03-20 |
United States Patent
Application |
20140075793 |
Kind Code |
A1 |
LOPEZ ALMENDROS; Jose ; et
al. |
March 20, 2014 |
DETACHABLE FASTENING SYSTEM BETWEEN A MALE PIECE AND A FEMALE
PIECE, PIN AND FEMALE PIECE
Abstract
Detachable fastening system between a male piece (2) and a
female piece (1), pin (3) and female piece (1), specifically for
use in machines for moving earth and stones. It is formed by a
tooth (2) with a transverse aperture, a tooth holder (2) with
another transverse aperture, a pin with an intermediate nipple, and
an elastic tensor (4) located in a complementary cavity of the
tooth holder (2). The penetration and subsequent rotation of the
pin (3) immobilizes it axially, as it is held in said angular
position by the action of the tensor (4). In addition, the pin (3)
has at one end a projection that interacts with a groove ramped
helicoidally and fitted in the aperture of the tooth in order to
absorb the axial forces, by unloading the tensor (4) thereof, and
also in order to limit the angular distance traveled by the pin
between the blocking and unblocking positions, and in order to
facilitate possible extraction thereof.
Inventors: |
LOPEZ ALMENDROS; Jose;
(Barcelona, ES) ; PEREZ SORIA; Francisco;
(Barcelona, ES) ; MARTINEZ; Angel; (Barcelona,
ES) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
METALOGENIA, S.A. |
Barcelona |
|
ES |
|
|
Assignee: |
METALOGENIA, S.A.
Barcelona
ES
|
Family ID: |
39788064 |
Appl. No.: |
14/024862 |
Filed: |
September 12, 2013 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
12524296 |
Jan 15, 2010 |
8555532 |
|
|
PCT/ES2007/000169 |
Mar 28, 2007 |
|
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14024862 |
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Current U.S.
Class: |
37/456 |
Current CPC
Class: |
E02F 9/2841 20130101;
E02F 9/2833 20130101 |
Class at
Publication: |
37/456 |
International
Class: |
E02F 9/28 20060101
E02F009/28 |
Claims
1-22. (canceled)
23. A female piece used for the movement of earth and stones,
comprising a hollow configured to house a nose of a male piece and
at least one through aperture for introducing a fastening element
or pin, the aperture comprising an inclined surface facing an
exterior of the female piece along an axis of the aperture, wherein
the inclined surface is helical and a one-piece integral
construction with a body portion of the female piece that defines
the aperture.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a detachable fastening
system between a male piece and a female piece, particularly
between a tooth and a tooth holder, and is formed by a tooth, a
tooth holder, a pin with an incorporated retaining element which
removably blocks said teeth with respect to the tooth holder, and
an elastically loaded tensor element, such that the various
elements collaborate to prevent the pin from coming out of its
blocking position and thus maintain the tooth and tooth holder
fastened.
[0002] The field of application of the present invention is any in
which the mechanical fastening between a male piece and a female
piece must be performed, and particularly it can be applied in the
sector of moving materials, such as earth and stones, in which the
bucket of an excavator is provided with a tooth holder to which
teeth are detachably secured, thus allowing the replacement
thereof.
TECHNICAL BACKGROUND
[0003] Machines for moving materials such as earth and stones,
including excavators and the like, and other machines used in
public works and mining, are used for pulling up, moving and
loading earth, stones and the like. These machines, which can be
presented under a variety of configurations, are usually provided
with one or more buckets attached to a mechanical arm. The bucket
is provided with a blade or beveled lip on a front edge intended to
strike and penetrate the mass of earth and stones. To prevent
excessive wear of the blade and to aid in penetrating the earth, it
is common to assemble wear elements or teeth associated to the
blade and projecting in front of same. However, said teeth are also
subjected to wear and breakages, therefore they must be replaced
often, and on the other hand, depending on the work for which the
machine is intended, it may be desirable to change the type or the
shape of the teeth. In order to facilitate said replacement, tooth
holders are used, which are secured to the blade of the bucket in a
more or less permanent manner, and the teeth are releasably
assembled in the tooth holder by means of pins. Said pins usually
traverse apertures of the tooth and a passage traversing the tooth
holder for the purpose of securing the tooth to the tooth
holder.
[0004] To prevent the pin from coming out of its assembly position,
a retaining device is used, which device maintains the pin in said
assembly position. The retaining device normally includes elastic
elements having the function of exerting pressure on the retainer
so that the latter remains in its assembly position. In working
conditions, the system receives forces and blows in all directions,
making the system move and reacting in an unwanted manner, causing
internal wear and shifting the pin. The pin can then come out of
the tooth holder, the pin and the tooth possibly being lost. The
loss of a tooth and/or pin can be very important depending on the
work site thereof, given that they can cause other machines to
break down, such as crushers, working in the same production site
as the machine using the teeth, such as for example mines or
quarries.
[0005] Patent application number WO-2005095720-A1 describes a
device for the detachable fastening of two mechanical pieces,
comprising a pin which removably blocks a first piece with respect
to a second piece, a retaining element associated to the pin and an
elastically loaded tensor element, collaborating to prevent the pin
from coming out of its blocking position; in this system it further
comprises at least two inclined planes the general shape of which
is that of a projection oriented in the axial direction of the pin,
such that upon rotating the pin, the retaining element travels said
inclined planes and the pin moves between two positions, the
blocking position and the unblocking position or the introduction
position of the pin, against the axial force exerted by said tensor
element in the direction of the axis of the pin.
[0006] In combination with the elastic load of the tensor element
and the retaining element, the two inclined planes make it very
difficult for the pin, with said retaining element, to come out of
its blocking position. During its working operation, the pin can
receive both longitudinal and transverse stressing, but it will be
difficult for it to receive stresses causing a rotation thereof,
such that the retainer of the pin cannot rotate from its blocking
position upon introducing the pin in the cavity formed by the male
piece and the female piece.
[0007] In the blocking position, the pin is completely introduced
in the channel or housing forming the apertures of the tooth and of
the tooth holder, the pin preferably not being a through pin, i.e.,
it does not traverse the two sides of the tooth, only one of them
for the introduction thereof. When the tooth is worn or the design
thereof has to be changed, it will be necessary to first remove the
pin. In this type of system, the stresses for disassembly are
greater than those for the assembly, because in addition to the
difficulties characteristic of the design and construction, the
disassembly is affected because during the work, the pin and the
retaining element can become deformed in addition to earth being
introduced in the housing of the pin, making the extraction thereof
difficult.
[0008] The movements of the fastening device under extreme working
conditions are unpredictable and often uncontrollable. After
several hours of working in a number of field tests, it was found
that the pin had experienced movement in an unwanted direction;
specifically it had shifted with respect to its working or blocking
position, towards the end opposite that for introducing the pin in
the tooth. In other words, as the end of the pin introduced in the
tooth holder had shifted, it tends to come out through the aperture
of the tooth opposite the introduction aperture for introducing it.
In the blocking position, the retainer of the pin is located
between an inner wall of the tooth and a wall of the tensor, and
due to the stress in work, the pin moves in the only direction that
is not limited, which is towards the tensor due to the fact that
the material thereof is not as hard as that of the tooth.
[0009] If the pin shifts from its blocking position such that the
end of the pin introduced in the tooth holder projects through the
aperture of the tooth opposite the introduction aperture for
introducing it, the pin thus being exposed to unwanted wear.
Furthermore, upon receiving the constant pressure exerted by the
retainer of the pin, the tensor is damaged, losing its technical
characteristics.
[0010] In the rotation for assembling the pin in application number
WO-2005095720-A1, the internal rotation of the retainer is not
visibly controllable from the outside, therefore the retainer
rotates until it has traveled along the entire surface of the
tensor, coming out of contact with the tensor and being housed
between the tensor and a wall of the cavity of the tensor existing
in the tooth holder.
[0011] The unwanted housing of the retainer of the pin between the
tensor and a wall of the cavity of the tensor, in addition to a
possible constant pressure of the retainer on the tensor, make it
difficult to extract the pin from the tooth-tooth holder
system.
BRIEF DESCRIPTION OF THE INVENTION
[0012] For the purpose of overcoming the mentioned drawbacks and
for simplifying and improving the assembly and disassembly of a
tooth in a tooth holder, and more generally, of two mechanical
pieces, a female piece and another male piece, to one another, the
fastening system object of the present invention is formed by a
tooth, a tooth holder, a fastening element of both or pin which is
introduced in a housing formed by the tooth and tooth holder, said
pin having a retaining element, a projection at the end of the pin
which is not introduced in the tooth holder and an elastically
loaded tensor element. The projection of the pin, located at the
end of the pin which is not introduced in the tooth holder, has a
preferably planar upper face or surface, and another lower one,
determining a maximum thickness of the projection, in which the
lower face or surface is arranged with a certain inclination with
respect to the upper face forming a ramp in the shape of a thread
crest or helix. The projection further has a front face preferably
secant to the body of the pin although it could also be tangent or
normal. The tooth also has a cavity in the shape of an arc or chord
of a circle adjacent to the hole for introducing the pin, said
cavity having an inclination opposite the inclination of the lower
wall of the projection of the pin. The inclination has a starting
point with a preferably nil depth with respect to the beginning of
the aperture of the tooth and an end point with a depth determined
by the length necessary for the retainer of the pin to reach the
position which allows the blocking. The cavity thus has a section
in the shape of the root of the thread which is coupled with the
ramp of the threaded retaining element of the pin.
[0013] The systems for the detachable fastening between tooth and
tooth holder usually have a pin securing the tooth-tooth holder
assembly the body of which has the shape of a surface of
revolution. Said body of the pin can be frustoconical in order to
facilitate introducing and extracting the pin, or cylindrical. The
pin is also preferably not a through pin, i.e., it does not
traverse the two sides of the tooth, preventing wear from occurring
at the ends of the pin. The length of the pin can encompass the
entire channel or housing formed by the width of the tooth between
the opposite apertures for the entrance and possible exit in the
tooth. It is also possible for the length of the pin to reach only
a mid-point of the duct or housing of the tooth holder.
[0014] As mentioned, the system also includes a tensor formed by a
flexible piece which is compressed when pressure is applied. The
tensor is located in a cavity, either of the tooth or of the tooth
holder, interacting between them. Said cavity is adjacent to the
entrance to the housing or duct of the tooth holder. The pin has a
retaining element the function of which is to maintain and/or
secure the pin in the blocking position, thus preventing the
shifting thereof outwards.
[0015] For the assembly of the system, first the tensor element is
placed in the cavity of the tensor, then the tooth is introduced on
the tooth holder, then the pin is introduced in the channel or
housing formed by an opening assembled in the surface of the tooth
and the duct or channel traversing the tooth holder. It is also
possible for the system to be formed by a tooth holder with a
cavity, and the nose or projection is in the tooth, such that the
tensor would be located in a cavity of the tooth and the ramp
adjacent to the aperture which collaborates with the ramp of the
projection of the pin would be located in the tooth holder.
[0016] In view of the foregoing, it is evident that the tooth can
be a male piece to be housed in the tooth holder, or a female piece
so that the tooth holder is housed inside the tooth, and depending
on the foregoing, the tooth holder will be a female piece or a male
piece, respectively.
[0017] The retaining element of the pin enters through a groove
arranged in said opening. When the tooth holder is a male piece, it
does not have said groove given that the retaining element must
remain between the inner surface of the tooth and the outer surface
of the tooth holder, in a cavity arranged between both pieces,
specifically between the tensor element and the inner surface of
the tooth.
[0018] Once the pin and the retaining element are introduced, the
system is located in the introduction/unblocking position of the
pin prior to the blocking of the system. In order to achieve said
blocking, a rotational movement is applied to the pin, and
therefore to the retainer, such that the latter shifts from the
introduction position to the blocking position through inclined
planes arranged in the surface of the tensor. In order to overcome
said inclined planes of the tensor, it is necessary to apply
pressure on the pin, specifically the retaining element against the
surface of the tensor which, as it is an elastic material, it is
compressed and the retainer is left to pass, overcoming the
inclined planes. Upon being compressed, the tensor exerts a force
opposite that of the pressure of the pin in its axial axis.
[0019] In the blocking position, the retaining element is located
in a cavity, in which the tensor no longer exerts the force of
pressure and limited on one side by the inner surface of the tooth
and on the opposite side by the elastic surface of the tensor
element.
[0020] At the end of the pin which is not introduced in the tooth
holder, as previously described, the pin as a projection the ramp
of which arranged in the lower surface of the projection contacts
with a cavity in a ramp adjacent to the hole of the pin existing in
the tooth, such that upon the pin rotating on the same axis as the
housing in which the pin is introduced, the projection is threaded
or screwed to the tooth with approximately a quarter of a
rotation.
[0021] In its assembly position, the retainer is fastened between
the inner surface of the tooth and the tensor made of elastic
material. Due to the fact that the hardness of the tensor is less
than that of the tooth, under extreme working conditions in which
the movements of the pin and of the retainer are inevitable and
unpredictable, the pin moves in the only direction it can, which is
in the direction in which the tensor is located, exerting pressure
on it. The foregoing makes the lower end of the pin come out
through the aperture opposite that of the introduction of the
tooth, exposing that end to unwanted wear. Furthermore, permanent
pressure in the retainer can damage its mechanical characteristics,
preventing it from carrying out its function which is that of
immobilizing and/or maintaining the retainer in its blocking
position. The contact of the ramp of the projection of the pin with
the cavity adjacent to the entrance aperture of the pin in the
tooth in the blocking position acts as a mechanical stop to prevent
the pin from shifting out of its blocking or working position,
particularly preventing the end of the pin introduced in the tooth
holder from projecting through the aperture of the tooth opposite
the introduction aperture, thus preventing the pin from being
exposed to unwanted wear.
[0022] The shape of the projection of the pin at the end opposite
that of introduction in the tooth holder is formed by a preferably
planar upper face, and a lower face, with a certain inclination
with respect to the upper face such that it forms a ramp in the
shape of a thread crest or helix. Said projection further has a
front face preferably secant to the body of the pin, although it
could also be tangent or normal, in which the front face contacts
with an opposite plane, located in the groove of the introduction
aperture for introducing the pin in the tooth. This contact acts as
a second mechanical stop to control the rotation of the retainer,
preventing the retainer from coming out, in an excessive rotation,
of the contact with the tensor and thus preventing it from being
housed in an unwanted manner between the tensor element and an
inner wall of the cavity for the tensor.
[0023] In the extraction, the force for the rotation must be
greater than and opposite the force in the rotation of the assembly
and the assembly area must be filled with packed fines along the
entire fastening system and the working conditions may have
affected the condition of the components of the system.
[0024] The geometry of implementing the present invention converts
the rotational force applicable for the disassembly of the pin into
a rectilinear movement towards the disassembly direction, which is
the same as the assembly direction but in the opposite direction.
This rectilinear movement allows the pin to come out of its
blocking position, the walls of the pin of the channel formed by
the apertures of the tooth and of the tooth holder being separated,
this unblocking being able to be complicated due to the packed
fines which may have been introduced in the hollows existing
between the various pieces of the system.
[0025] Upon removing the pin from its blocking position and
shifting it outwards, access to the upper end of the pin is easier,
which allows extracting it without problems.
[0026] As previously mentioned, the extreme working conditions and
their effects in the system are uncontrollable, therefore after
having extracted the pin from its blocking area, the fines make it
even more difficult to completely extract the pin from the housing.
To that end and once the pin is released with rotational movement,
the ramp of the projection of the pin and the surface of the ramp
adjacent to the hole of the pin are somewhat separated, a tip of a
tool being able to be introduced between the two ramps by
supporting the tip of the tool in the ramp of the cavity in order
to be able to make a lever effort between the two surfaces, and to
thus be able to apply more force in order to finish extracting the
pin.
DESCRIPTION OF THE DRAWINGS
[0027] In order to further understand the foregoing, drawings are
attached which schematically and only by way of a non-limiting
example depict several practical embodiments. In the drawings:
[0028] FIG. 1 is a perspective view of a tooth-tooth holder
assembly of a bucket of an excavating machine with a device
according to the prior state of the art;
[0029] FIG. 2 shows three views of a pin used in the state of the
art;
[0030] FIG. 3 shows three views of a tensor used in the state of
the art;
[0031] FIG. 4 is a perspective view of a tooth-tooth holder
assembly of a bucket of an excavating machine with a device
according to an embodiment of the invention;
[0032] FIG. 5 is the tooth and pin assembly in the blocking
position;
[0033] FIG. 6 is a tooth and pin assembly in the extraction
position with the aid of a tool for acting as a lever;
[0034] FIG. 7 is a perspective view of a tooth;
[0035] FIG. 8 is a perspective view of a detail of the hole of the
tooth of FIG. 7;
[0036] FIG. 9 is a rear perspective view of a tooth;
[0037] FIG. 10 is a perspective view of a tooth holder;
[0038] FIG. 11 is a perspective view of a pin;
[0039] FIG. 12 shows three views of a pin;
[0040] FIG. 13 is an upper perspective view of a pin;
[0041] FIG. 14 is a detail of the upper end of the pin;
[0042] FIG. 15 shows different configurations of the plan view of
the upper projection of the pin;
[0043] FIG. 16 is a detail of the pin in the blocking position in a
longitudinal section;
[0044] FIG. 17 is a detail of the pin in the blocking position in a
cross section;
[0045] FIG. 18 is a perspective view of a tooth-tooth holder
assembly of a bucket of an excavating machine with a device
according to another embodiment of the invention;
[0046] FIG. 19 shows three views of a pin used in the system of
FIG. 18;
[0047] FIG. 20 is a perspective view of a tooth-tooth holder
assembly of a bucket of an excavating machine with a device
according to another embodiment of the invention, in which the
fastening system is introduced vertically and in which the cavity
adjacent to the hole of the pin is located in the tooth holder;
[0048] FIG. 21 shows three views of a pin used in the system of
FIG. 20.
DETAILED DESCRIPTION OF SEVERAL EMBODIMENTS
[0049] Several embodiments of the invention are described below
which are applied, by way of example, to the assembly and
disassembly of a tooth in a tooth holder of a bucket of an
excavating machine.
[0050] In reference to FIGS. 1 to 3, which show solutions of the
prior state of the art, a tooth-tooth holder assembly is observed
comprising a tooth 1 which determines a hollow, a tooth holder 2
with a nose which is housed inside the hollow of the tooth 1, a pin
3, a retainer associated to the pin 5 and an elastic tensor element
35.
[0051] The following figures refer to a fastening system object of
the present invention, between a tooth 1 and a tooth holder 2, in
which a pin 3 detachably blocks the tooth 1 with respect to the
tooth holder 2, and a retaining element 35 associated to the pin 3
together with an elastically loaded tensor element 4 collaborate to
prevent the pin from coming out of its blocking position. A pin is
described in the embodiment with a length encompassing the entire
channel or housing of the tooth holder but it is possible that it
may only reach an intermediate point of the channel or housing of
the tooth holder.
[0052] The pin 3 is provided with a body 31, the shape of which is
that of a preferably frustoconical surface of revolution, a
retaining element 35 having the function of maintaining the pin in
the assembly position.
[0053] The end of the pin 3 which is not introduced in the tooth
has a recess 37 with the suitable shape for coupling a tool by
means of which a rotational movement can be applied to the pin
about its longitudinal axis.
[0054] The pin 3 is provided with a projection 32 located at the
end of the pin which is not introduced in the tooth. The projection
32 has a preferably planar upper face 33 and another lower face 34,
in which the lower face 34 is arranged at a certain inclination
from the upper face 33 forming a ramp 34a. The projection further
has a front face 41 preferably secant to the body of the pin but it
can also be tangent or normal, as can be observed in FIG. 15.
[0055] The inclination of the slope 34a begins with a thickness
tending to 0 and the thickness gradually increases as it reaches a
maximum thickness. The maximum thickness is that necessary so that
in a quarter of a rotation it allows the retainer to be located
between the tooth and the tooth holder, more specifically between
the tooth and the tensor, which is located inside the cavity 22 of
the tooth holder 2. In this embodiment of the invention, the ramp
34a has the shape of a helix, but this surface could be planar or
curved.
[0056] The tooth 1 is formed by an upper wall 18 a lower wall 19
and two side walls 15 and 16, it is further provided with at least
one through aperture 11 in one of the side walls 15 or 16. Said
aperture has a groove 12 in order to introduce the retaining
element 35 of the pin 3.
[0057] Adjacent to the aperture 11 of the tooth there is a cavity
13 which is introduced or included in the wall of the aperture 11
in the shape of an arc or chord of a circle, this cavity 13 having
an inclination like a ramp such that the surface or inclined face
of said ramp is planar (13a), also being able to be arched, concave
or convex. The inclination of said ramp of the cavity 13 is
opposite the inclination of the lower wall of the projection 32 of
the pin 3. Said cavity 13 has a starting point (i) with a
preferably nil depth at the height of the outer surface 15 of the
tooth 1 and an end point (f) with a depth which is defined by the
length necessary for the retainer 35 of the pin 3 to reach the
position which allows the blocking, i.e., in the cavity formed by
the tensor 4 and a wall or inner surface 14 of the tooth.
Obviously, the height or depth of the ramp 13a is limited by the
thickness of the wall in which introduction aperture 11 for
introducing the pin 3 in the tooth 1 is included, said height or
depth being able to be less than or equal to said thickness.
[0058] The tooth holder 2 includes a housing or channel 21 for the
pin 3 and a cavity 22 for housing the tensor element 4.
[0059] When the system is assembled, first the tensor 4 is
introduced inside the cavity 22 of the tooth holder 2, then the
tooth 1 is introduced on the tooth holder 2. The apertures 11 of
the tooth 1 and the channel or housing 21 of the tooth holder are
aligned forming a duct in which the pin 3 is located in the
assembly.
[0060] When the pin 3 is introduced inside the duct formed by the
aperture 11 of the tooth 1 and the housing 21 of the tooth holder
2, the retainer 35 passes through the groove 12 of the tooth. The
tooth holder does not have said groove 12 since the retaining
element 35 remains between the inner surface 14 of the tooth 1 and
the tooth holder 2, more specifically between the tensor element 4
and the inner wall 14 of the tooth 1.
[0061] In this introduction/unblocking position of the pin 3, and
with the aid of a tool, the pin 3 rotates to the blocking position,
the retainer 35 moving through the inclined planes 6 of the tensor
4. In order to overcome said inclined planes 6 of the tensor 4,
pressure is applied on the pin 3, and upon applying pressure on pin
3 pressure is applied on the retainer 35, integral with the pin 3,
which applies pressure on the tensor 4 which, upon being made of an
elastic material, is compressed, allowing the retainer 35 to pass
to its blocking position.
[0062] In the rotational movement, the ramp 34a of the projection
32 of the pin 3 slides through the inclined cavity or ramp 13,
adjacent to the aperture 11, of the tooth 1, and the cooperation of
the two slopes 34a and 13 allows threading the pin 3 a quarter of a
rotation inside the tooth 1. In this description the rotation is of
a quarter of a turn, but this is only an example, since it could be
more than a quarter of a turn or not reach the quarter of a
turn.
[0063] Contact between the slope of the inclined cavity or ramp 13
of the tooth and the ramp 34a of the projection of the pin 32 acts
as the first mechanical stop for the unwanted movement in the
direction opposite the introduction direction.
[0064] The function of the front face 41 is that of contacting with
the face 43 of the notch 12 of the hole 11 of the tooth for the
pin, acting as a second mechanical stop, limiting the rotation of
the pin, also limiting the rotation of the retainer to prevent it
from coming out of its inner contact with the tensor.
[0065] With the aid of a tool when unblocking, the pin 3 is rotated
in the direction opposite that of the assembly direction. The
rotational movement is converted into linear movement of the pin 3
which shifts it outwards enough so as to access the pin manually
and easily extract it.
[0066] Due to the working conditions, the fastening system can be
packed by the fines and mud which may enter the system, and the
combination of the rotational movement with a longitudinal movement
aids in the pin separating from inner walls of the housing 21,
coming out of the packing.
[0067] The drawings show tooth-tooth holder systems in which the
pin is introduced through the side of the tooth 1, but it is only
an example, since this detachable fastening system can also be used
in other systems in which the pin is introduced vertically, as in
FIG. 20, or even diagonally.
[0068] As previously mentioned, the previous description of the
embodiment refers to a system in which it is the tooth holder which
has a nose for being introduced in the hollow of the tooth, but as
mentioned, the application of the invention to systems in which it
is the tooth which has a nose for being introduced in a hollow of
the tooth holder is also possible, such that it is the tooth holder
which has a hollow for housing the nose of the tooth and it is the
tooth holder which has a ramp adjacent to the aperture for the pin
to collaborate with the ramp of the projection of said pin, as can
be seen in FIG. 20.
* * * * *