WO2023129876A1

WO2023129876A1 - Reflow oven

Info

Publication number: WO2023129876A1
Application number: PCT/US2022/082281
Authority: WO
Inventors: Yuhua Ni
Original assignee: Illinois Tool Works Inc.
Priority date: 2021-12-31
Filing date: 2022-12-22
Publication date: 2023-07-06
Also published as: TWM644743U; CN217452667U

Abstract

The present application provides a reflow oven. The reflow oven includes: a rack (17), a display device (11), a mounting panel (13), and a mounting structure (12). The mounting panel (13) is secured to the rack (17) for mounting the display device (11). The mounting structure (12) is configured to mount the display device 5 (11) to the mounting panel (13), the mounting structure including a steering mechanism such that the display device (11) is pivotable to change the position of the display device (11) parallel to a length direction, a width direction, and a height direction of the reflow oven.

Description

REFLOW OVEN

Technical Field

The present application relates to a reflow oven, in particular to a mounting structure of a display device for mounting the reflow oven.

Background

The reflow oven includes a display device through which an operator sets reflow soldering operation parameters, etc. Also, the display device shows the status of the reflow operation. The position-adjustable display device allows the operator to control the reflow soldering operation and understand the operation status through the display device, and facilitates maintenance of the furnace chamber of the reflow oven.

Summary

The present application provides a reflow oven, and a display device of the reflow oven can be pivoted to change position, which facilitates the operation of an operator and maintenance of the furnace chamber of the reflow oven.

According to one aspect of the present application, the reflow oven of the present application includes a rack, a display device, a mounting panel, and a mounting structure. The mounting panel is secured to the rack for mounting the display device. The mounting structure is configured to mount the display device to the mounting panel, the mounting structure including a steering mechanism to enable the display device to pivot to change a position of the display device parallel to a length direction, a width direction, and a height direction of the reflow oven.

The reflow oven as described above, the mounting panel being proximate an inlet end of the reflow oven.

The reflow oven as described above, further including a movable panel configured to be easily removably mounted to the rack of the reflow oven. The movable panel is mounted below the mounting panel and aligned with the mounting panel along a height direction of the reflow oven.

The reflow oven as described above, a plurality of screw holes being provided on the mounting panel to receive a plurality of screws, through which the mounting panel is fixed to the rack of the reflow oven, wherein the diameter of the plurality of screw holes is slightly larger than that of the corresponding screws.

The reflow oven as described above, the mounting structure including: a first arm, a second arm, and a third arm. The first arm is pivotally connected to the mounting panel, the second arm is pivotally connected to the first arm, and the third arm is pivotally connected to the second arm.

The reflow oven as described above, the steering mechanism including a first arm first steering mechanism, a first arm second steering mechanism, a first arm third steering mechanism, a second arm first steering mechanism, a second arm second steering mechanism, a third arm first steering mechanism, and a third arm second steering mechanism. The first arm first steering mechanism is fixed on the mounting panel, and the first arm first steering mechanism has a first arm first steering mechanism shaft extending substantially parallel to the height direction of the reflow oven, the first arm being pivotable about the first arm first steering mechanism shaft. The first arm second steering mechanism is disposed at an end of the first arm proximate the mounting panel, the first arm second steering mechanism being connected with the first arm first steering mechanism, the first arm second steering mechanism having a first arm second steering mechanism shaft extending substantially parallel to the length direction of the reflow oven, the first arm being pivotable about the first arm second steering mechanism shaft. The first arm third steering mechanism is disposed at an end of the first arm proximate the second arm and connected with the second arm, the first arm third steering mechanism having a first arm third steering mechanism shaft extending substantially parallel to the length direction of the reflow oven, the second arm being pivotable about the first arm third steering mechanism shaft. The second arm first steering mechanism is disposed at an end of the second arm away from the first arm, the second arm first steering mechanism having a second arm first steering mechanism shaft extending substantially parallel to the height direction of the reflow oven. The second arm second steering mechanism and the second arm first steering mechanism are connected, the second arm second steering mechanism having a second arm second steering mechanism shaft extending substantially parallel to the length direction of the reflow oven. The third arm first steering mechanism is disposed at an end of the third arm away from the second arm, and the third arm first steering mechanism has a third arm first steering mechanism shaft that extends substantially parallel to the height direction of the reflow oven. The third arm second steering mechanism is provided at an end of the third arm proximate the second arm, the third arm second steering mechanism has a third arm second steering mechanism shaft extending substantially parallel to the height direction of the reflow oven, and the third arm is pivotable about the third arm second steering mechanism shaft.

The reflow oven as described above, the display device including: a display and a bracket, and the bracket is used for placing a mouse and a keyboard. The display is connected to the second arm by the second arm first steering mechanism and the second arm second steering mechanism so that the display is pivotable about the second arm first steering mechanism shaft of the second arm first steering mechanism, and the display is pivotable about a second arm second steering mechanism shaft of the second arm second steering mechanism. The bracket is connected to the third arm by the third arm first steering mechanism so that the bracket is pivotable about the third arm first steering mechanism shaft of the third arm first steering mechanism.

The reflow oven as described above, the first arm configured with a locking mechanism for preventing or releasing pivoting of the first arm about the first arm second steering mechanism shaft and preventing or releasing pivoting of the second arm about the first arm third steering mechanism shaft. The second arm is configured with a first retention mechanism for defining an angle at which the display pivots about the second arm first steering mechanism shaft. The third arm is configured with a second retention mechanism for defining an angle at which the third arm pivots about the third arm second steering mechanism shaft.

Brief Description of Drawings

Fig. 1 shows a perspective view of a reflow oven according to the present application.

Fig. 2 is a section of a side view of a reflow oven according to the present application, illustrating a configuration of a mounting bracket.

Fig. 3 is a cross-sectional view of a lateral side of the mounting bracket.

Fig. 4 is a perspective view of one angle of the mounting bracket.

Fig. 5 is a rear view of the mounting bracket. Fig. 6 is a partial enlarged view of a reflow oven according to the present application when the mounting panel is mounted, where in the mounting state of the mounting panel, the mounting panel is fixed to the rack of the reflow oven.

Fig. 7 is a partial enlarged view of a reflow oven according to the present application when the mounting panel is disassembled, where in the disassembled state of the mounting panel, the mounting panel is disassembled from the rack of the reflow oven.

Fig. 8 is a partially enlarged view of the interior of a reflow oven according to the present application showing the back side of a movable panel.

Detailed Description

Various specific embodiments of the present application will be described below with reference to the attached drawings that form a part of the present specification. It should be understood that the same or similar reference numerals used in the present application refer to the same components where possible.

Fig. 1 shows a perspective view of a reflow oven 10 according to the present application. As shown in Fig. 1 , a plurality of panels 101 to 107 are provided around the lower side of the reflow oven 10, and various devices (not shown), such as an electrical control box, an air control panel, and a furnace chamber lift support rod, of the reflow oven 10 are contained in the space behind the plurality of panels 101 to 107. The panels 102 to 107 are mounted to a rack 17 (shown in Fig. 3) of the reflow oven 10 in an easily removable manner for a purpose of facilitating maintenance and replacement of these devices. Unlike the other panels 102 to 107, the panel 101 at an inlet end proximate the reflow oven 10 is composed of an upper sub-panel and a lower sub-panel, which are a mounting panel 13 and a movable panel 14, respectively. The mounting panel 13 and the movable panel 14 are aligned in a height direction of the reflow oven 10. As will be discussed in detail below, the movable panel 14 is removably mounted to the rack 17 of the reflow oven in a similar manner to the other panels 102 to 107, while the mounting panel 13 is securely mounted to the rack 17 of the reflow oven 10 in a non-removable manner. As shown in Fig. 1 , the display device 11 is mounted on the mounting panel 13 through a mounting bracket 12. The display device 11 includes a display 111 , a bracket 112, a keyboard (not shown) and a mouse (not shown), the keyboard and the mouse being placed on the bracket 112.

The panel 101 is composed of the mounting panel 13 and the movable panel 14. This is because the inventors of the present application find that there is no device provided for the reflow oven on the back of the mounting panel 13, but only a device provided for the reflow oven (that is, a computer mainframe and a backup power supply (not shown)) provided on the back of the movable panel 1 . Thus, the inventors of the present application divide the panel 101 into two separate (upper and lower) panels 13 and 14, and fix the upper mounting panel 13 to the rack 17 of the reflow oven in a non-removable manner (such as screw connection) to make a sufficiently secure connection between the mounting panel 13 and the rack 17, so that the mounting panel 13 has a mounting strength sufficient to support the display device 11 and the mounting bracket 12, while easily detachably connecting the movable panel 14 below to the rack 17 in a similar manner to the other panels 102 to 107, so that the computer main frame and backup power supply of the reflow oven 10 disposed behind the movable panel 14 can still be easily maintained.

As also shown in Fig. 1 , the reflow oven 10 is provided with a light tower strut 15 at a position above the panel 101 , and the light tower strut 15 is used to support a light device 16 that is used to display the working state of the reflow oven 10. When the working state of the reflow oven 10 is abnormal, the light device 16 illuminates to alarm. The inventors of the present application find that the display device 11 and the mounting bracket 12 are not suitable for securing to the light tower strut 15. This is because the light tower strut 15 is a round pipe, which is not suitable for the mounting method of the mounting bracket 12 according to the present application, and is not strong enough to support the display device 11 and the mounting bracket 12.

Fig. 2 is a section of a side view of the reflow oven 10 according to the present application, illustrating an embodiment of a configuration of the mounting bracket 12. As shown in Fig. 2, the mounting bracket 12 includes a first arm 121 , a second arm 122, and a third arm 123. The first arms 121 , 122, 123 are connected to each other by a steering mechanism, and the first arm 121 is connected with the mounting panel 13 by a steering mechanism. The second arm 122 is connected to the device 111 by a steering mechanism, and the third arm 123 is connected to the bracket 112 by a steering mechanism. Through the steering mechanism, the display device 11 is capable of pivoting to change a position parallel to the length, width, and height directions of the reflow oven 10. In the embodiment shown in Fig. 2, the steering mechanism is a plain bearing. It can be understood that in other embodiments, the steering mechanism may also be other configurations.

As shown in Fig. 2, the first arm 121 has a first arm first steering mechanism 124 and a first arm second steering mechanism 125 connected to each other at one end proximate the mounting panel 13, and the first arm first steering mechanism 124 is fixed to the mounting panel 13 such that the first arm 121 is fixedly connected to the mounting panel 13. The first arm first steering mechanism 124 has a first arm first steering mechanism shaft 124’ extending substantially parallel to the height direction of the reflow oven 10, the first arm 121 being pivotable about the first arm first steering mechanism shaft 124’. As the first arm 121 pivots, the display 111 and the bracket 112 are able to change positions within a plane defined substantially parallel to the length and width of the reflow oven 10. The first arm second steering mechanism 125 has a first arm second steering mechanism shaft 125’ extending substantially parallel to the length direction of the reflow oven, the first arm 121 being pivotable about the first arm second steering mechanism shaft 125’. As the first arm

121 pivots about the first arm first steering mechanism shaft 125’, the display 111 and the bracket 112 may change positions within a plane defined substantially parallel to the height and width of the reflow oven 10. The first arm 121 has a first arm third steering mechanism 126 at one end proximate the second arm 122. The second arm 122 is connected to the first arm 121 by a first arm third steering mechanism 126. The first arm third steering mechanism 126 has a first arm third steering mechanism shaft 126’ extending substantially parallel to the length direction of the reflow oven 10, the second arm 122 being pivotable about the first arm third steering mechanism shaft 126’. As the second arm 122 pivots about the first arm third steering mechanism shaft 126’, the display 111 connected to the second arm

122 may change the position within a plane defined substantially parallel to the height and width of the reflow oven 10. Also, because the third arm 123 connected with the bracket 112 is connected to the second arm 122, the bracket 112 is also able to change positions within a plane defined substantially parallel to the height and width of the reflow oven 10 as the second arm 122 pivots about the first arm third steering mechanism shaft 126’. As also shown in Fig. 2, the second arm 122 has a second arm first steering mechanism 127 and a second arm second steering mechanism 128 connected to each other at one end proximate the display 111 . The display 111 is connected to the second arm 122 by a second arm first steering mechanism 127 and a second arm second steering mechanism 128. The second arm first steering mechanism 127 has a second arm first steering mechanism shaft 127’ (see Fig. 3) extending substantially parallel to the height direction of the reflow oven 10, the display 111 being pivotable about the second arm first steering mechanism shaft 127’, enabling the position of the display 111 within a plane defined substantially parallel to the length and width of the reflow oven 10 to be changed. The second arm second steering mechanism 128 has a second arm second steering mechanism shaft 128’ extending substantially parallel to the length direction of the reflow oven 10, the display 111 being pivotable about the second arm second steering mechanism shaft 128’, enabling the position of the display 111 within a plane defined substantially parallel to the height and width of the reflow oven to be changed.

As still shown in Fig. 2, the third arm 123 has a third arm first steering mechanism 129 at one end proximate the bracket 112, and the bracket 112 is connected to the third arm 123 by the third arm first steering mechanism 129. The third arm first steering mechanism 129 has a third arm first steering mechanism shaft 129’ extending substantially parallel to the height direction of the reflow oven 10, and the bracket 112 is capable of pivoting about the third arm first steering mechanism shaft 129’, so that the bracket 112, and the keyboard and the mouse placed on the bracket 112 can change positions within a plane defined substantially parallel to the length and width of the reflow oven 10. The third arm 123 has a third arm second steering mechanism 130 at one end proximate the second arm 122. The third arm 123 is connected to the second arm 122 by a third arm second steering mechanism 130. The third arm second steering mechanism 130 has a third arm second steering mechanism shaft 130’ (see Fig. 3) coaxial to the second arm 122 and extending substantially parallel to the height direction of the reflow oven 10, and the third arm 123 is pivotable about the third arm second steering mechanism shaft 130’. As the third arm 123 pivots about the third arm second steering mechanism shaft 130’, the bracket 112 connected to the third arm 123, and the keyboard and the mouse placed on the bracket 112 may change positions within a plane defined substantially parallel to the length and width of the reflow oven 10. As described above, through the steering mechanism, the display 111 and the bracket 112 are capable of pivoting to change the positions of the display 111 and the bracket 112 within a plane defined substantially parallel to the length and width of the reflow oven 10 and a plane defined substantially parallel to the height and width of the reflow oven 10, so that the display 111 and the bracket 112 can change the positions parallel to the length, width, and height directions of the reflow oven. As a result, the operator can adjust the positions of the display 111 and the keyboard and mouse placed on the bracket 112 as needed. This may facilitate operation of the display device 11 by the operator and is particularly advantageous for maintenance of the reflow oven 10. When performing maintenance on the reflow oven 10, the operator may change the positions of the display 111 and the bracket 112 so that the operator can easily clean up the flux within the furnace chamber of the reflow oven 10.

The second arm 122 is provided with a retention mechanism 131. As shown in Fig. 3, in one embodiment, the retention mechanism 131 is a damping nut. The retention mechanism 131 defines an angle at which the display 111 pivots about the second arm first steering mechanism shaft 127’. The third arm 123 is provided with a retention mechanism 141. As shown in Fig. 4, in one embodiment, the retention mechanism 141 is a jackscrew. The retention mechanism 141 defines an angle at which the third arm 123 pivots about the third arm second steering mechanism shaft 130’.

The first arm 121 is provided with a locking mechanism. As shown in Fig. 5, in one embodiment, the locking mechanism is comprised of a hand brake 151 and an air spring structure 152. When the hand brake 151 is in a release position as shown in Fig. 5, the locking mechanism is in a locked state, in which the pivotal movement of the first arm 121 about the first arm second steering mechanism shaft 125’ is locked, that is, the first arm 121 cannot pivot about the first arm second steering mechanism shaft 125’. The pivotal movement of the second arm 122 about the first arm third steering mechanism shaft 126’ is also locked, that is, the second arm 122 cannot pivot about the first arm third steering mechanism shaft 126’. When the first arm 122 is required to pivot about the first arm second steering mechanism shaft 125’ or the second arm 122 is required to pivot about the first arm third steering mechanism shaft 126’ to adjust the positions of the display 111 and the bracket 112, the handbrake 151 is pushed upward to unlock. In other words, when the hand brake 151 is pushed upward, the locking mechanism is in an unlocked state in which the first arm 121 is capable of pivoting about the first arm second steering mechanism shaft 125’ and the second arm 122 is capable of pivoting about the first arm third steering mechanism shaft 126’. In other embodiments, the locking mechanism of the first arm 121 may be other suitable configurations. It is advantageous to provide a locking mechanism on the first arm 121 . The first arm 121 has a longer length and it bears a heavier weight from the display device 11 and the mounting bracket 12. The locking mechanism is provided on the first arm 121 so that the first arm 121 does not pivot about the first arm second steering mechanism shaft 125’ undesirably, and the second arm 122 does not pivot about the first arm third steering mechanism shaft 126’ undesirably.

Figs. 6 and 7 show the connection between the mounting bracket 12 and the mounting panel 13, and the connection between the mounting panel 13 and the movable panel 14 and the rack 17 of the reflow oven 10. Fig. 6 shows a state in which the mounting panel 13 is fixed on the rack 17, while Fig. 7 shows a state in which the mounting panel 13 is detached from the rack 17. As shown in Figs. 6 and 7, the first arm first steering mechanism 124 is connected to a first sheet metal 161 , and the first sheet metal 161 is further connected to a second sheet metal 162. The second sheet metal 162 is secured to the mounting panel 13 by screws 165, thereby securing the mounting bracket 12 to the mounting panel 13. A plurality of screw holes

171 are provided on the mounting panel 13 to receive screws 172, and the screws

172 are fixed to the corresponding screw holes 173 on the rack 17, thereby fixing the mounting panel 13 to the rack 17. The diameter of the screw hole 171 on the mounting panel 13 is configured to be slightly larger than the diameter of the received screw 172. Such setting is important to the present invention. After the mounting bracket 12 and the display device 11 are mounted on the mounting panel 13, the mounting panel 13 bears a considerable weight, which easily causes a small amount of offset between an actual position and a predetermined position of the mounting panel 13, causing a gap between the mounting panel 13 and the movable panel 14 and the adjacent panel 102 not meeting the tolerance requirements. However, by configuring the diameter of the screw hole 171 on the mounting panel

13 to be slightly larger than the diameter of the screw 172, the mounting panel 13 is provided with room for adjustment of the position, which facilitates adjustment of the gap between the mounting panel 13 and the movable panel 14 and the adjacent panel 102, so that the gap meets the tolerance requirements. Moreover, the diameter of the screw hole 171 on the mounting panel 13 is configured to be slightly larger than the diameter of the screw 172, so that the mounting stability between the mounting panel 13 and the rack 17 can still be ensured.

The movable panel 14 is mounted to the rack 17 in an easy-to-removable manner such that it is easy to disassemble to maintain the device behind the movable panel 14 (i.e. , a computer mainframe and a backup power supply). One embodiment of mounting the movable panel 14 is shown in Figs. 6 to 8. In the embodiment, the movable panel 14 is easily detachably mounted to the rack 17 by through the cooperation of a triangular lock 163 and a screw 181 on the bottom of the rack 17. The triangular lock 163 has a locking tab 164. When the locking tab 164 is pressed against the sheet metal of the rack 17 and the screw 181 passes through a mounting hole 182 at the bottom of the movable panel 14 as shown in FIG. 8, the movable panel 14 is mounted on the rack 17. The screw 181 restricts only the freedom of movement of the movable panel 14 in a plane defined by the length and width of the reflow oven 10, and does not limit the freedom of movement of the movable panel 14 in the height direction of the reflow oven 10. When the movable panel 14 needs to be disassembled, a tool is used to engage the receiving head of the triangular lock 163 located on the front of the movable panel 14, and then rotated 90 degrees to make the locking tab 164 rotate 90 degrees, thereby releasing the pressing from the locking tab 164 against the sheet metal of the rack 17. At this point, the movable panel 14 may be tilted outward, so that the movable panel 14 may be pulled obliquely upward, causing the screw 181 exit the mounting hole 182 at the bottom of the movable panel 14, thereby disassembling the movable panel 14 from the rack.

Although the present disclosure has been described in connection with examples of the embodiments outlined above, various alternatives, modifications, variations, improvements, and/or substantial equivalents, whether known or foreseeable now or in the near future, may be apparent to those having at least ordinary skill in the art. In addition, the technical effects and/or technical problems described in this Specification are exemplary and not limiting; therefore, the disclosure in this Specification may be used to solve other technical problems and have other technical effects and/or may solve other technical problems. Therefore, examples of embodiments of the present disclosure as set forth above are intended to be illustrative and not limiting. Various changes may be made without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is intended to include all known or earlier developed alternatives, modifications, variations, improvements and/or substantial equivalents.

Claims

CLAIMS What is claimed is:

1 . A reflow oven, comprising: a rack; a display device; a mounting panel secured to the rack for mounting the display device; a mounting structure configured to mount the display device to the mounting panel, the mounting structure including a turning mechanism such that the display device is pivotable to change a position of the display device parallel to a length direction, a width direction, and a height direction of the reflow oven.

2. The reflow oven according to Claim 1 , wherein the mounting panel is close to an inlet end of the reflow oven.

3. The reflow oven according to Claim 2, wherein the reflow oven further includes a movable panel configured to be removably mounted to the rack of the reflow oven, the movable panel being mounted below the mounting panel and aligned with the mounting panel along a height direction of the reflow oven.

4. The reflow oven according to Claim 1 , wherein a plurality of screw holes are provided on the mounting panel to receive a plurality of screws, through which the mounting panel is fixed to the rack of the reflow oven, wherein the plurality of screw holes have a diameter slightly larger than that of the corresponding screws.

5. The reflow oven according to Claim 1 , wherein the mounting structure includes: a first arm pivotally connected to the mounting panel and a third arm; a second arm pivotally connected to the first arm; and a third arm pivotally connected to the second arm.

6. The reflow oven according to Claim 5, wherein the steering mechanism includes: a first arm first steering mechanism fixed on the mounting panel, the first arm first steering mechanism having a first arm first steering mechanism shaft, the first arm first steering mechanism shaft extending substantially parallel to the height direction of the reflow oven, the first arm pivotable about the first arm first steering mechanism shaft; and a first arm second steering mechanism disposed at an end of the first arm proximate the mounting panel, the first arm second steering mechanism connected with the first arm first steering mechanism, the first arm second steering mechanism having a first arm second steering mechanism shaft, the first arm second steering mechanism shaft extending substantially parallel to the length direction of the reflow oven, the first arm pivotable about the first arm second steering mechanism shaft; a first arm third steering mechanism disposed at an end of the first arm proximate the second arm and connected with the second arm, the first arm third steering mechanism having a first arm third steering mechanism shaft, the first arm third steering mechanism shaft extending substantially parallel to the length direction of the reflow oven, the second arm pivotable about the first arm third steering mechanism shaft; a second arm first steering mechanism disposed at an end of the second arm away from the first arm, the second arm first steering mechanism having a second arm first steering mechanism shaft, the second arm first steering mechanism shaft extending substantially parallel to the height direction of the reflow oven; a second arm second steering mechanism connected with the second arm first steering mechanism, the second arm second steering mechanism having a second arm second steering mechanism shaft, the second arm steering mechanism shaft extending substantially parallel to the length direction of the reflow oven; a third arm first steering mechanism disposed at an end of the third arm away from the second arm, the third arm first steering mechanism having a third arm first steering mechanism shaft, the third arm first steering mechanism shaft extending substantially parallel to the height direction of the reflow oven; and a third arm second steering mechanism disposed at an end of the third arm proximate the second arm, the third arm second steering mechanism having a third arm second steering mechanism shaft, the third arm second steering mechanism shaft extending in a direction substantially parallel to the height of the reflow oven, the third arm pivotable about the third arm second steering mechanism shaft.

7. The reflow oven according to Claim 6, wherein the display device includes: a display and a bracket, the bracket used for placing a mouse and a keyboard; wherein the display is connected to the second arm by the second arm first steering mechanism and the second arm second steering mechanism, so that the display is pivotable about the second arm first steering mechanism shaft of the second arm first steering mechanism, and the display is pivotable about the second arm second steering mechanism shaft of the second arm second steering mechanism;

The bracket is connected to the third arm by the third arm first steering mechanism, so that the bracket is pivotable about the third arm first steering mechanism shaft of the third arm first steering mechanism.

8. The reflow oven according to Claim 7, wherein the first arm is configured with a locking mechanism for preventing or releasing pivoting of the first arm about the first arm second steering mechanism shaft and preventing or releasing pivoting of the second arm about the first arm third steering mechanism shaft; the second arm is configured with a first retention mechanism for defining an angle at which the display pivots about the second arm first steering mechanism shaft; the third arm is configured with a second retention mechanism for defining an angle at which the third arm pivots about the third arm second steering mechanism shaft.

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