Patent Description:
A conventional switch or switch indication device is applied to an electrical, electronic or automatic control system for an operator to know the working or power-on/off state of the machine. Such switch device includes a seat body or main body, internal switch components and multiple sets of terminal pins arranged in a chamber defined by the seat body. The terminal pins extend out of the chamber or the seat body to connect with electrical conductive wire or insert on a circuit board to achieve electrical connection. A light source is disposed in the chamber of the seat body and electrically connected with a set of positive/negative electrode contact pins of the terminal pins. A slightly transparent maintenance or pushbutton switch is mounted on upper section of the chamber of the seat body, whereby an operator can know the working or power-on/off state of the machine through the maintenance or pushbutton switch, which makes the light source emit light or not emit light.

With respect to the manufacturing and structural design of this sort of switch device, the conventional switch seat body or main body is entirely made of metal material as a cylindrical body with an internal chamber. The outer surface of the seat body is partially lathed/milled and processed to form a thread. After the internal switch components are assembled in the internal chamber of the seat body, the seat body is pressurized and forcedly deformed so as to secure the seat body with the internal switch components to form the switch device.

As well known by those who are skilled in this field, the manufacturing, assembling, processing and securing operation of the seat body of the above embodiment are more troublesome and time-consuming. As a result, the manufacturing cost is increased.

Still with respect to the structural design and operation application of the seat body of the switch device, the seat body is selectively made of metal material because when the seat body of the switch device is mounted on the panel or substrate for an operator to operate, the seat body can have sufficient structural hardness to resist against the outward destroying force created in operation. For example, the substrate applies reaction force to the seat body to cause wear and damage of the surface structure of the seat body and make the seat body loosen from the substrate. This is not what we expect.

An improved conventional switch seat body structure has been disclosed, which employs a metal head section and a nonmetal belly section connected with the head section to improve the problem that the operation is troublesome and time-consuming and provide sufficient structural hardness to resist against the outward destroying force created in operation. For example, <CIT> "switch seat body structure and manufacturing method thereof" provides a preferred embodiment.

The embodiment includes a main body for assembling with the internal switch components. The main body is composed of a metal head section and a nonmetal belly section. The metal head section has a shoulder section and a skirt section connected with the shoulder section (and/or the skirt section is formed with a recessed section and a subsidiary shoulder section). The shoulder section and the skirt section together define a shaft hole. The shoulder section protrudes toward outer side of the metal head section and the skirt section axially extends toward the nonmetal belly section. In addition, in cooperation with a molding module, the nonmetal belly section material is filled in to connect with at least a part of the skirt section (and/or recessed section and subsidiary shoulder section). Accordingly, the nonmetal belly section and the metal head section are integrally connected.

With respect to the structure and manufacturing of the above embodiment, the metal head section must be made from an entire metal column body by means of lathing/milling the metal column body into a cylindrical body structure. In cooperation with a miller and/or a drilling machine, most of the material of the metal cylindrical body structure is removed to manufacture the shaft hole form for mounting the switch (pushbutton).

It should be noted that the main body structure and manufacturing process of the above embodiment need to be further improved so as to shorten the manufacturing time and solve the problems that the manufacturing process is troublesome, a great amount of waste metal material is produced to affect the cost and the environment is contaminated. In this case, the switch industry can be upgraded.

To speak representatively, the above references reveal some shortcomings of the seat body or the main body and the relevant connection components of the conventional switch device in use and structural design. In case the structures and the application conditions of the seat body or the main body and the relevant components are redesigned to be different from the conventional switch device, the use form of the switch device can be changed to be different from the conventional switch device.

For example, in the condition that the seat body or the main body is manufactured to have sufficient structural hardness or strength to resist against the outward destroying force (or external action force) so as to reduce the wear and damage of the surface structure of the seat body, in comparison with the conventional switch device, the present invention can improve or eliminate the shortcoming of the conventional switch device that the metal head section must be made by means of lathing/milling to form the shaft hole. In this case, the problems of the conventional switch device that the manufacturing process is time-consuming and troublesome, a great amount of waste metal material is produced and the cost is higher are solved. Furthermore, the manufacturing process of the seat body (or the main body) is simplified to form multiple structural forms (and/or figures or characters with decoration/indication effect). Therefore, in accordance with the actual use situation, an operator can selectively use different main body structure with different structural form to widen the application range of the switch device. All the above issues are not substantially taught, suggested or disclosed in the above references.

<CIT> discloses a seat body structure for mounting a switch component on a panel or substrate through an opening of said panel or substrate, said seat body structure comprising:a main body composed of a metal head section and a nonmetal belly section, the main body being defined with an axis, the nonmetal belly section extending downward from the metal head section in a direction in parallel to the axis, the metal head section having a first wall having geometrical configuration, a second wall connected with with one end of the first wall and at least one shaft hole positioned on the axis, wherein the first and second walls together define the shaft hole, wherein the first wall being normal to the axis, the second wall being parallel to the axis, whereby the first and second walls contain an angle, which is a right angle, each of the first and second walls having an outer surface and an inner surface, the first and second walls together defining therebetween a first space, the nonmetal belly section being formed with a second internal space.

It is therefore a primary object of the present invention to provide a switch seat body assembling structure according to claim <NUM>, including a main body for assembling with a switch component. The main body is composed of a metal head section in the form of a thin sheet structure and a nonmetal belly section. The main body is defined with an eccentric axis and has at least one shaft hole positioned on the eccentric axis. The metal head section has a first wall normal to or inclined from the eccentric axis and a second wall connected with one end of the first wall and parallel to or inclined from the eccentric axis. The first and second walls together define a space therebetween. The nonmetal belly section fills the space to connect with entire sections of the first and second walls as an integrated body. In condition that the switch seat body can resist against the outward destroying force and the manufacturing process is simplified, the shortcomings of the conventional switch device that the processing and manufacturing operation is time-consuming and troublesome the material cost is higher are improved.

In the above switch seat body assembling structure, the eccentric axis is defined with reference to the main body. The eccentric axis deviates from the central position of the main body and defined as the eccentric axis.

In the above switch seat body assembling structure, the first and second walls of the metal head section (or the main body) contain an angle, which is an acute angle, a right angle or an obtuse angle. The first and second walls together define multiple shaft holes having geometrical configurations. The second wall is formed with multiple assembling sections. The assembling sections have the form of protruding plate body structure or hole structure for enhancing the connection effect between the second wall and the nonmetal belly section.

The present invention can be best understood through the following description and accompanying drawings, wherein:.

Please refer to <FIG> and <FIG>. The switch seat body assembling structure of the present invention includes a switch seat main body <NUM> for assembling with a switch component <NUM> (or wire connection terminal) to form a switch device or switch assembly. In a preferred embodiment, the main body <NUM> is composed of a metal head section <NUM> in the form of a thin sheet structure and a nonmetal belly section <NUM>. The main body <NUM> is defined with an eccentric axis y with reference to the main body <NUM>. The eccentric axis y deviates from the central position of the main body <NUM> and defined as the eccentric axis.

In the description hereinafter, the upper section, upper side, lower section, lower side, outer section, outer side, inner section, inner side, etc. mentioned are recited with the direction of the drawings as the reference direction.

In a preferred embodiment, the metal head section <NUM> is made from a metal thin sheet by means of directly pressing the metal thin sheet. The metal head section <NUM> has a first wall <NUM> normal to (or inclined from) the eccentric axis y and a second wall <NUM> connected with one end of the first wall <NUM> in parallel to (or inclined from) the eccentric axis y to together define at least one shaft hole <NUM> positioned on the eccentric axis y.

It should be noted that the thin sheet structure configuration of the metal head section <NUM> permits the metal head section <NUM> (and/or the shaft hole <NUM>) to be pressed into various geometrical configurations or structures according to the use requirements, (for example, circular shape, elliptic shape, triangular shape, square shape, rectangular shape, polygonal shape, irregular shape, etc.) In addition, the first wall <NUM> and the second wall <NUM> of the metal head section <NUM> (or the main body <NUM>) contain an angle. The angle is an acute angle, a right angle or an obtuse angle.

In a preferred embodiment, the other end of the first wall <NUM> is selectively formed and connected with a subsidiary wall <NUM>. The subsidiary wall <NUM> is formed in such a manner that the other end of the first wall <NUM> is (arched) bent toward the lower side of the drawing to extend in a direction in parallel to (or inclined from) the eccentric axis y. In addition, the first wall <NUM>, the second wall <NUM> and the subsidiary wall <NUM> (in accordance with the direction shown in the drawing) are respectively defined with outer surfaces 11a, 12a, 13a and inner surfaces 11b, 12b, 13b.

<FIG> especially shows that the first wall <NUM> or the inner surface 11b of the first wall (and the subsidiary wall <NUM> or the inner surface 13b of the subsidiary wall) and the second wall <NUM> or the outer surface 12a of the second wall together define a space <NUM>. The nonmetal belly section <NUM> is made of plastic or the like material by means of the molding module to fill in the space <NUM> and entirely connect with the first wall <NUM> (or the inner surface 11b of the first wall) and the second wall <NUM> (or the outer surface 12a of the second wall) and/or the subsidiary wall <NUM> (or the inner surface 13b of the subsidiary wall). The nonmetal belly section <NUM> extends toward the lower side of the drawing in a direction in parallel to the eccentric axis y so as to integrally connect with the metal head section <NUM>. In this case, the structure of the metal head section <NUM> and the structure of the nonmetal belly section <NUM> can reinforce each other as shown in <FIG>.

As shown in the drawings, the nonmetal belly section <NUM> is a column-shaped body structure with a thread <NUM> on the surface. The nonmetal belly section <NUM> defines an internal space <NUM> in cooperation with the shaft hole <NUM> of the metal head section <NUM> for assembling with the switch component <NUM> as shown in <FIG>. In addition, a shoulder section <NUM> is disposed in the internal space <NUM> of the nonmetal belly section <NUM> for regulating the assembling position of the metal head section <NUM> and the nonmetal belly section <NUM> to help in locating the metal head section <NUM>.

It should be noted that the nonmetal belly section <NUM> is formed with a tray section <NUM> for filling the space <NUM>. The tray section <NUM> is correspondingly connected with the first wall <NUM> of the metal head section, whereby the first wall <NUM> encloses the shaft hole <NUM>. The area of the first wall <NUM> (or the tray section <NUM>) can be smaller than, equal to or larger than the (cross-sectional) area of the shaft hole <NUM>.

The phantom lines of <FIG> show the assembly of the main body <NUM> and the substrate <NUM>. When the main body <NUM> and the substrate <NUM> are assembled for an operator to operate and use, the nonmetal belly section <NUM> cooperates with the subsidiary wall <NUM> of the metal head section <NUM> to press and connect with the substrate <NUM> to achieve a secure assembling effect, (especially the first wall <NUM> and the tray section <NUM> will connect with the substrate <NUM> by a large area). Accordingly, the switch seat body (or the main body <NUM>) can resist against the outward destroying force. Therefore, in condition that the manufacturing process is simplified, the shortcomings of the conventional switch device that the processing and manufacturing operation is time-consuming and troublesome the material cost is higher can be improved.

It should be noted that the first wall <NUM> of the metal head section <NUM> provides a large-area section, on which a plane (or solid or hollow) figure (or character) section can be arranged or printed or stamped to achieve decoration and/or indication effect.

The phantom lines of <FIG> also show that the switch component <NUM> is assembled in the main body <NUM> (including the shaft hole <NUM> of the metal head section <NUM> and the internal space <NUM> of the nonmetal belly section <NUM>).

Please now refer to <FIG>. A light source component <NUM> (such as LED component) is mounted in the main body <NUM> or the internal space <NUM> of the nonmetal belly section <NUM> as shown by the phantom lines of the drawing.

In a preferred embodiment, the nonmetal belly section <NUM> of the main body <NUM> is formed with a restriction section <NUM> in the form of a hole structure (or protrusion structure). The switch component <NUM> (or the light source component <NUM>) has an insertion section <NUM> in the form of a protrusion structure (or hole structure). The restriction section <NUM> is correspondingly assembled with the insertion section <NUM>, whereby the switch component <NUM> (or the light source component <NUM>) is securely assembled in the main body <NUM>.

As shown in <FIG>, a closure body <NUM> is disposed in the shaft hole <NUM> of the metal head section <NUM>. The closure body <NUM> is selectively made of plastic material or the like material to form a structure with a U-shaped cross section. Basically, the closure body <NUM> can be alternatively integrally formed with the nonmetal belly section <NUM>.

As shown in the drawing, the closure body <NUM> includes a base section <NUM> on the upper side and a wall section <NUM> perpendicularly connected with the base section <NUM>. The wall section <NUM> cooperates with the nonmetal belly section <NUM> to respectively compress the inner surface 12b and outer surface 12a of the second wall <NUM> of the metal head section, whereby the nonmetal belly section <NUM> encloses the second wall <NUM> to achieve securer connection effect.

In a preferred embodiment, the base section <NUM> and/or wall section <NUM> of the closure body <NUM> can be transparent so that the light source component <NUM> can emit light through the closure body <NUM>.

<FIG> shows a modified embodiment of the present invention, in which the second wall <NUM> of the main body <NUM> or the metal head section extends to outer side of the main body <NUM> and is inclined from the eccentric axis y, whereby the first wall <NUM> and the second wall <NUM> contain an acute angle. In the structural form that the second wall <NUM> obliquely extends to outer side of the main body <NUM>, a section <NUM> of the nonmetal belly section <NUM> cooperates with the nonmetal belly section <NUM> to respectively compress the inner surface 12b and outer surface 12a of the second wall <NUM> of the metal head section. Accordingly, the nonmetal belly section <NUM> encloses at least a part of the second wall <NUM> to achieve secure connection effect.

Please refer to <FIG>, which shows that the second wall <NUM> of the main body <NUM> obliquely extends to the interior of the main body <NUM> (or the eccentric axis y), whereby the first wall <NUM> and the second wall <NUM> contain an obtuse angle and at least a part of the second wall <NUM> is enclosed between the nonmetal belly section <NUM> and the closure body <NUM>.

<FIG> show that the second wall <NUM> of the main body obliquely extends to outer side of the main body <NUM> (or away from the eccentric axis y), whereby the first wall <NUM> and the second wall <NUM> contain an acute angle and at least a part of the second wall <NUM> is enclosed between the nonmetal belly section <NUM> and the closure body <NUM>.

In a preferred embodiment, the first wall <NUM> of the main body <NUM> is formed with connection sections <NUM> (near the subsidiary wall <NUM>) for connecting with the nonmetal belly section <NUM> and enhancing the connection effect between the metal head section <NUM> and the nonmetal belly section <NUM> without easy detachment. The connection sections <NUM> have a structural form made in such a manner that the first wall <NUM> is pressed to lower side of the drawing to form at least one hole structure <NUM> and two plate body sections <NUM> formed on two sides (or the periphery) of the hole structure <NUM>.

In this embodiment, the first wall <NUM> of the main body <NUM> is formed with a connection section <NUM>. The connection section <NUM> have a structural form made in such a manner that the first wall <NUM> is pressed to lower side of the drawing to form at least one (elongated) hole structure <NUM> and a plate body section <NUM> formed on at least one side (or the periphery) of the hole structure <NUM>. After the metal head section <NUM> and the nonmetal belly section <NUM> are connected, the structure of the plate body section <NUM> near the subsidiary wall <NUM> serves to enhance the connection security between the edge section of the metal head section <NUM> and the nonmetal belly section <NUM>.

In this embodiment, the first wall <NUM> of the main body <NUM> is formed with a connection section <NUM>. The connection section <NUM> have a structural form made in such a manner that the first wall <NUM> is pressed to lower side of the drawing to form a hole structure <NUM> and two plate body sections <NUM> formed on two sides (or the periphery) of the hole structure <NUM>.

In this embodiment, a (solid) figure (character) section <NUM> can be disposed in the hole structure <NUM> to provide decoration or indication effect. Alternatively, the figure section <NUM> can be disposed on the tray section <NUM> of the nonmetal belly section <NUM> in a position corresponding to the hole structure <NUM>, whereby the figure section <NUM> can be presented through the hole structure <NUM>.

In a modified embodiment, the figure (character) section <NUM> can be pressed or formed with hollow form. Cooperatively, the nonmetal belly section <NUM> is made of transparent material, whereby the light emitted from the internal light source can pass through to achieve more apparent or special decoration and/or indication effect.

Please refer to <FIG>, which shows that the second wall <NUM> and the subsidiary wall <NUM> of the main body obliquely extend to the interior of the main body <NUM> (or to the eccentric axis y), whereby the first wall <NUM> and the second wall <NUM> contain an obtuse angle and at least a part of the second wall <NUM> is enclosed between the nonmetal belly section <NUM> and the closure body <NUM>.

In this embodiment, the subsidiary wall <NUM> obliquely extends to the interior of the main body <NUM> (or to the eccentric axis y), whereby the first wall <NUM> and the subsidiary wall <NUM> and the nonmetal belly section <NUM> are more securely connected so that (the edge section) is uneasy to detach.

<FIG> show that the first wall <NUM> of the metal head section or the main body <NUM> extends in a direction normal to the eccentric axis y. The other end of the first wall <NUM> extends to outer side of the main body <NUM> to form the subsidiary wall <NUM> inclined from the eccentric axis y, whereby the subsidiary wall <NUM> has an (inclined) head section 13c. The tail end of the subsidiary wall <NUM> (or the head section 13c) extends to outer side of the main body <NUM> in a direction normal to the eccentric axis y to form a connection section 13d. Accordingly, the metal head section <NUM> (or the first wall <NUM> and the subsidiary wall <NUM>) and the tray section <NUM> of the nonmetal belly section <NUM> are respectively formed with at least two-stage structure or high-and-low stage structure. This can avoid mis-touch of the switch and increase the structural strength of the main body <NUM>.

In this embodiment, the angle contained between the first wall <NUM> and the head section 13c of the subsidiary wall is an acute angle, a right angle or an obtuse angle. The angle contained between the head section 13c of the subsidiary wall and the connection section 13d is an acute angle, a right angle or an obtuse angle. In addition, the figure section <NUM> is arranged on the first wall <NUM>.

Please refer to <FIG>, which show that the first wall <NUM> of the metal head section or the main body <NUM> extends in a direction normal to the eccentric axis y. The other end of the first wall <NUM> extends to outer side of the main body <NUM> to form the subsidiary wall <NUM> inclined from the eccentric axis y, whereby the subsidiary wall <NUM> has an (inclined) head section 13c. The tail end of the subsidiary wall <NUM> (or the head section 13c) extends to outer side of the main body <NUM> in a direction normal to the eccentric axis y to form a connection section 13d. Accordingly, the metal head section <NUM> (or the first wall <NUM> and the subsidiary wall <NUM>) and the tray section <NUM> of the nonmetal belly section <NUM> are respectively formed with at least two-stage structure or high-and-low stage structure.

In this embodiment, the angle contained between the first wall <NUM> and the head section 13c of the subsidiary wall is an acute angle, a right angle or an obtuse angle. The angle contained between the head section 13c of the subsidiary wall and the connection section 13d is an acute angle, a right angle or an obtuse angle. In addition, the tray section <NUM> of the nonmetal belly section <NUM> at least partially extends to outer side of the main body <NUM> and protrudes from the connection section 13d. The portion of the tray section <NUM> protruding from the connection section 13d is defined as a protrusion portion. A (solid) figure section <NUM> can be arranged on the protrusion portion.

Please refer to <FIG> and <FIG>, which show that the metal head section <NUM> of the main body <NUM> is formed with two shaft holes <NUM>. The nonmetal belly section <NUM> is formed with two internal spaces <NUM> corresponding to the two shaft holes <NUM>. In addition, the second wall <NUM> of the metal head section <NUM> is formed with at least one assembling section <NUM>.

In this embodiment, multiple assembling sections <NUM> integrally protrude from the lower section of the second wall <NUM> in a direction in parallel to the eccentric axis y. Each assembling section <NUM> includes a base section 14a coplanar with the second wall <NUM> (or the outer surface 12a of the second wall) and a subsidiary section 14b perpendicularly bent from the base section 14a to protrude in a direction to outer side of the main body <NUM> (or away from the eccentric axis y), whereby the assembling section <NUM> has the form of an L-shaped plate body structure.

<FIG> and <FIG> show that the assembling section <NUM> has the form of an L-shaped plate body structure. When the nonmetal belly section <NUM> is connected with the metal head section <NUM>, the structures of the assembling sections <NUM> serve to prevent the metal head section <NUM> from easily detaching from the nonmetal belly section <NUM> so as to achieve a secure connection effect.

In this embodiment, the assembling sections <NUM> have the form of hole structures (or protrusion structures). The nonmetal belly section <NUM> is formed with insertion sections <NUM> protruding to the eccentric axis y (or the interior of the main body <NUM>) (or formed with insertion sections <NUM> recessed to outer side of the main body <NUM>). When the nonmetal belly section <NUM> is assembled with the metal head section <NUM>, the nonmetal belly section <NUM> is plugged into the assembling sections <NUM> of the metal head section <NUM> and the insertion sections <NUM> are inserted with the assembling sections <NUM>. In this case, the metal head section <NUM> is uneasy to detach from the nonmetal belly section <NUM> and a secure connection effect is achieved.

Please refer to <FIG> and <FIG>, which show that the (solid) figure section <NUM> is arranged or pressed and formed on the main body <NUM> or the first wall <NUM>.

It should be noted that the shaft hole <NUM> of the metal head section <NUM> made of thin sheet body can be directly pressed into geometrical configuration. For example, <FIG> and <FIG> show that two (rectangular) holes are connected with two sides of the (circular) shaft hole <NUM>. Therefore, the shaft hole <NUM> (and/or the first wall <NUM>) also can be made with square, rectangular, triangular, polygonal, regular or irregular geometrical configuration.

The phantom lines of <FIG> and <FIG> show that the main body <NUM> is assembled with the switch component <NUM> (or wire connection terminal). In this embodiment, the figure section <NUM> is arranged, printed or stamped on the first wall <NUM> of the metal head section <NUM> in accordance with the practical use requirement.

<FIG> and <FIG> show that the metal head section <NUM> (or the first wall <NUM>) has an elliptic configuration and two circular shaft holes <NUM>. <FIG> shows that the metal head section <NUM> (or the first wall <NUM>) has a rectangular configuration and two square shaft holes <NUM>. <FIG> shows that the metal head section <NUM> (or the first wall <NUM>) has an (irregular) geometrical configuration and a circular shaft hole <NUM> and a square shaft hole <NUM>.

<FIG> and <FIG> show a preferred embodiment of the present invention. In this embodiment, two (elongated) holes are respectively connected with two sides of the (circular) shaft hole <NUM> of the metal head section <NUM>. In addition, according to the practical use requirement (and corresponding to the structure of the shaft hole <NUM> and for assembling with different forms of switch component), the nonmetal belly section <NUM> has a (circular or arched) main section <NUM> and two (elongated) wing sections <NUM> integrally connected with two sides of the main section <NUM>.

<FIG> shows the structures of the main body <NUM>, the switch component <NUM>, the substrate <NUM> and the case <NUM>. The metal head section <NUM> of the main body <NUM> has multiple shaft holes <NUM>. At least one (or multiple) nonmetal belly sections <NUM> are connected with the metal head section <NUM> corresponding to the shaft holes <NUM>. Multiple switch components <NUM> are mounted in the nonmetal belly sections <NUM> and disposed on the substrate <NUM>. The substrate <NUM> cooperates with the case <NUM> to receive (or secure) the nonmetal belly sections <NUM> and the switch components <NUM>.

<FIG> shows that the main body <NUM> is assembled with another structural form of switch component <NUM> (or wire connection terminal). The main body <NUM> cooperates with the substrate <NUM> and the case <NUM> to receive (or secure) the nonmetal belly sections <NUM> and the switch components <NUM>.

<FIG> shows a structural form that the main body <NUM> is formed with multiple latch sections <NUM> latched with the substrate <NUM>. The latch section <NUM> has an (elastic) arm section 18a (perpendicularly) protruding from the main body <NUM> and a hook section 18b formed at the tail end of the arm section 18a. Accordingly, the arm section 18a cooperates with the hook section 18b to latch on the substrate <NUM>.

To speak representatively, in the condition that the structure is simplified and the manufacturing is facilitated, in comparison with the conventional switch device, the switch seat body assembling structure of the present invention has the following advantages:.

Claim 1:
A switch seat body assembling structure for mounting a switch component (<NUM>), a light source component (<NUM>) or a wire connection terminal on a panel or substrate through an opening of said panel or substrate comprising:
a main body (<NUM>) composed of a metal head section (<NUM>) in the form of a thin sheet structure and a nonmetal belly section (<NUM>), wherein the metal head section (<NUM>) is made by means of directly pressing a metal thin sheet,
the main body (<NUM>) being defined with an eccentric axis (y) deviating from a central position of the main body (<NUM>), the nonmetal belly section (<NUM>) extending downward from the metal head section in a direction in parallel to the axis, the metal head section (<NUM>) having a first wall (<NUM>) having a geometrical configuration, a second wall (<NUM>) connected with one end of the the first wall (<NUM>) and at least one shaft hole (<NUM>) positioned on the eccentric axis (y), wherein
the shaft hole (<NUM>) is directly pressed into a geometrical configuration, wherein the first and second walls together define the shaft hole, the first wall (<NUM>) being normal to the eccentric axis y or inclined from the eccentric axis y, the second wall (<NUM>) being parallel to the eccentric axis y or inclined from the eccentric axis y, whereby the first and second walls (<NUM>, <NUM>) contain an angle, which is an acute angle, a right angle or an obtuse angle, each of the first and second walls (<NUM>, <NUM>) having an outer surface (11a, 12a) and an inner surface (11b, 12b), the first and
second walls (<NUM>, <NUM>) together defining therebetween a first space (<NUM>) for the nonmetal belly section (<NUM>) to fill the first space (<NUM>), the nonmetal belly section (<NUM>) being formed with a second internal space (<NUM>), the nonmetal belly section (<NUM>) being formed with a tray section (<NUM>) filling the first space (<NUM>) to at least connect with entire sections of the inner surface (11b) of the first wall and the outer surface (12a) of the second wall,
whereby the metal head section (<NUM>) covers at least partially the tray section (<NUM>) of the nonmetal belly section (<NUM>) and the metal head section (<NUM>) and the nonmetal belly section (<NUM>) are connected as an integrated body structure.