Attachment device

Abstract

The present invention provides an attachment device that prevents the nut on the braided hose from loosening when threaded against the threaded portion on the sensor side, and also protects the braided hose attached to the sensor from the side. [Solution] The attachment device 30 is a disc-shaped mounting plate portion 40 that is attached to the flat portion 14a of the sensor 10, and comprises a mounting plate portion 40 having a rectangular opening 41 with a width W41 in the short direction that matches the flat diameter of the nut 21 provided on the braided hose 20, formed from the outer edge of the mounting plate portion 40 toward the inside of the mounting plate portion 40, and a nut rotation prevention plate portion 50 which is made up of a pair of flat plates 51, 52 erected along the opposing long sides 41a, 41b of the rectangular opening 41 of the mounting plate portion 40, and prevents the rotation of the nut 21 that is screwed and fixed to the threaded portion 13 by the pair of flat plates 51, 52 and protects the braided hose 20 attached to the sensor 10 from the side.

Description

Technical Field

[0001] The present invention relates to an attachment device used for a sensor assembly formed by attaching a blade hose to a sensor by screwing and fixing a nut provided on the blade hose for protecting a cable led out from a threaded portion of the sensor to the threaded portion.

Background Art

[0002] For example, a position detection sensor for detecting the position of a moving body such as a piston rod is attached to the moving body, and a signal from the position detection sensor is received using a cable led out through a threaded portion protruding from a flat portion of the position detection sensor. And it is also generally done to attach a blade hose to the sensor by screwing and fixing a nut provided at the tip of the blade hose that covers the periphery of the cable, thereby protecting the cable from the outside. Here, if it is used for many years with the blade hose attached to the sensor, the screwing state of the nut provided on the blade hose with respect to the threaded portion on the sensor side may loosen, and the blade hose may come off the sensor and the cable may be exposed. In addition, since the side surface of the blade hose attached to the sensor is not protected, there is a problem that the blade hose swings due to vibration and the blade hose is damaged.

[0003] On the other hand, as a cable connector in which a boot on the cable side does not come off from a holding member (such as a ground nut) that holds the cable even when a bending force is applied to the cable, for example, the one shown in Patent Document 1 is known. The cable connector shown in Patent Document 1 includes a holding member that holds a cable, a boot having a covering portion that covers the cable, and a fixing member that fixes the boot to the holding member. The holding member has an engaging portion, the boot has an engaged portion that engages with the engaging portion and an engaging portion, and the fixing member has a protruding portion that engages with the engaging portion of the boot. When the fixing member is attached to the boot, the boot is sandwiched by the holding member and the fixing member.

Prior Art Documents

[0004] [Patent Document 1] Patent No. 4071235 [Overview of the project] [Problems that the invention aims to solve]

[0005] Here, the cable connector shown in Patent Document 1 can prevent the cable-side boot from coming off the retaining member that holds the cable even when bending force is applied to the cable, but it does not relate to a sensor assembly in which a blade hose is attached to a sensor by screwing a nut provided on a blade hose that protects the cable leading out from a threaded portion erected on the flat surface of the sensor onto the threaded portion. Therefore, even with the cable connector shown in Patent Document 1, it is not possible to prevent the nut provided on the braided hose from loosening when threaded against the screw portion on the sensor side, nor is it possible to protect the braided hose attached to the sensor from the side.

[0006] Therefore, the present invention has been made to solve these conventional problems, and its objective is to provide an attachment device that prevents the screwing of the nut provided on the braided hose with respect to the threaded portion on the sensor side from loosening, and that can protect the braided hose attached to the sensor from the side. [Means for solving the problem]

[0007] To solve the above problems, an attachment device according to one aspect of the present invention is an attachment device used in a sensor assembly in which a blade hose is attached to a sensor by screwing a nut provided on the blade hose, which protects a cable led out through a threaded portion protruding from the flat portion of the sensor, onto the threaded portion, and the attachment device comprises a disc-shaped mounting plate portion attached to the flat portion of the sensor, the mounting plate portion having a rectangular opening formed from the outer edge of the mounting plate portion toward the inside of the mounting plate portion with a width in the short direction that matches the flat diameter of the nut, and a pair of flat plates erected along each of the opposing long sides of the rectangular opening of the mounting plate portion, the pair of flat plates preventing the rotation of the nut screwed onto the threaded portion and protecting the blade hose attached to the sensor from the side. [Effects of the Invention]

[0008] The attachment device according to the present invention provides an attachment device that prevents the screw-on state of the nut provided on the braided hose from loosening with respect to the threaded portion on the sensor side, and also protects the braided hose attached to the sensor from the side. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view showing an example in which an attachment device according to one embodiment of the present invention is attached to a sensor of a sensor assembly mounted on a piston rod. [Figure 2] Figure 1 is a perspective view showing the sensor assembly with the blade hose removed from the sensor. [Figure 3] This is a perspective view of the attachment device. [Figure 4] The attachment device is shown, with (a) being a front view and (b) being a right side view. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described below with reference to the drawings. The embodiments shown below are illustrative examples of devices and methods for realizing the technical concept of the present invention, and the technical concept of the present invention is not limited to the following embodiments in terms of the material, shape, structure, arrangement, etc. of the components. Furthermore, drawings are schematic representations. Therefore, it should be noted that the relationship and ratios between thickness and planar dimensions may differ from those in reality, and there may be differences in dimensional relationships and ratios between drawings themselves.

[0011] Figure 1 shows an example in which an attachment device 30 according to one embodiment of the present invention is attached to the sensor 10 of a sensor assembly 1 that is attached to a piston rod R. Figure 2 shows the state in which the blade hose 20 has been removed from the sensor 10 of the sensor assembly 1 shown in Figure 1. Here, the sensor assembly 1 comprises a sensor 10 and a braided hose 20 attached to the sensor 10. The sensor assembly 1 is attached to the sensor 10 by screwing a nut 21, provided on the braided hose 20 which protects the cable C (see Figure 2) that is led out through a threaded portion 13 protruding from the flat surface of the sensor 10 (the lower surface 14a of the cover 14 that constitutes the sensor 10), onto the threaded portion 13.

[0012] Sensor 10 is a position detection sensor that detects the position of a piston rod R, and comprises a sensor body 11 and a mounting portion 12 for attaching the sensor body 11 to the piston rod R. The mounting portion 12 is formed in a cylindrical shape, and a disc-shaped cover 14 is attached to its lower end by a plurality of mounting screws 15. A hollow cylindrical threaded portion 13 is provided in the center of the lower surface portion 14a of the cover 14 so as to protrude downward from the lower surface portion 14a. The threaded portion 13 is composed of a male thread. A cable C is connected to the sensor body 11, and as shown in Figure 2, the cable C is led out downward through the hollow portion of the threaded portion 13. Multiple bolt holes 16 are formed circumferentially in the cover 14 and the mounting portion 12, through which the threaded shafts (not shown) of mounting bolts 60 for attaching the cover 14 and the mounting portion 12 to the piston rod R are inserted.

[0013] The braided hose 20 covers the cable C leading from the sensor 10 from the outside, protecting the cable C from external elements. The braided hose 20 is also a stainless steel braided hose and has an electromagnetic shielding function for the cable C. A nut 21 is rotatably supported at the end of the braided hose 20. As described above, the nut 21 is screwed into and fixed to the threaded portion 13 provided on the sensor 10, thereby attaching the braided hose 20 to the sensor 10. If the sensor 10 is used for many years with the braided hose 20 attached, the nut 21 on the braided hose 20 may loosen from its threaded portion 13 on the sensor 10, causing the braided hose 20 to detach from the sensor 10 and the cable C to be exposed. In addition, since the sides of the braided hose 20 attached to the sensor 10 are not protected, vibrations can cause the braided hose 20 to shake and be damaged.

[0014] Therefore, in this embodiment, the aforementioned problem is solved by attaching the attachment device 30 to the sensor 10. As shown in Figures 1, 3 and 4(a) and 4(b), the attachment device 30 includes a disc-shaped mounting plate portion 40 that is attached to the lower surface portion 14a of the cover 14, which is the flat surface of the sensor 10, and a nut rotation stopper plate portion 50 fixed to the mounting plate portion 40.

[0015] The mounting plate portion 40 is composed of a metal disc having an outer diameter approximately the same as that of the cover 14 of the sensor 10. The mounting plate portion 40 has a rectangular opening 41 extending in the short direction (left-right direction in Figure 4(a)) and the long direction, with a width W41 in the short direction that matches the flat diameter D of the nut 21, formed from the outer edge of the mounting plate portion 40 toward the inside of the mounting plate portion 40. The width W41 in the short direction of the rectangular opening 41 is the same size as the flat diameter D of the nut 21 as described above, and the length L in the long direction of the rectangular opening 41 is approximately 3 / 4 the size of the diameter of the mounting plate portion 40. Here, the "flat diameter" of the nut is the distance between the straight parts of the hexagon or square. In this embodiment, the nut 21 is a hexagonal nut, and as shown in Figure 2, the flat diameter D is the distance between the straight parts of the hexagon of the hexagonal nut 21. Therefore, the width W41 in the shorter direction of the rectangular opening 41 is equal in size to the distance between opposing sides of the hexagonal nut that makes up the nut 21.

[0016] As shown in Figures 1, 3, and 4(a), the mounting plate portion 40 has a plurality of bolt insertion holes 42 formed along its circumference at a predetermined pitch for inserting the threaded shafts of mounting bolts 60. The mounting bolts 60 have the function of attaching the mounting plate portion 40 to the lower surface portion 14a of the cover 14, which is the flat surface portion of the sensor 10, and the function of attaching the mounting portion 12 of the sensor 10 and the cover 14 to the piston rod R. The mounting plate portion 40 is placed on the lower surface portion 14a of the cover 14 so that each bolt insertion hole 42 is aligned with each bolt hole 16 formed in the cover 14. Then, the bolt insertion holes 42 to be used are selected from the plurality of bolt insertion holes 42, and the threaded shafts of the plurality of mounting bolts 60 are inserted into the selected bolt insertion holes 42 and bolt holes 16 and screwed into the piston rod R, thereby attaching the mounting plate portion 40 to the lower surface portion 14a of the cover 14. At the same time, the cover 14 and mounting portion 12 of the sensor 10 are attached to the piston rod R.

[0017] Note that the installation position of the bolt insertion hole 42 formed in the mounting plate portion 40 corresponds to the installation position of the mounting screw 15 for attaching the lid 14 to the attachment portion 12. As shown in FIG. 1, when the mounting plate portion 40 is attached to the lower surface portion 14a of the lid 14, the mounting screw 15 will be located within the bolt insertion hole 42 or within the rectangular opening 41. Also, the nut rotation prevention plate portion 50 is composed of a pair of flat plates 51 and 52 erected along each of the pair of opposing long sides 41a and 41b of the rectangular opening 41 of the mounting plate portion 40. The nut rotation prevention plate portion 50 prevents the rotation of the nut 21 screwed and fixed to the screw portion 13 on the sensor 10 side by the pair of flat plates 51 and 52 and protects the blade hose 20 attached to the sensor 10 from the side.

[0018] As shown in FIGS. 3 and 4(a) and (b), each of the flat plates 51 and 52 is formed in an L-shaped cross-section by bending a rectangular flat metal piece. The root bending portions 51a and 52a of each of the flat plates 51 and 52 are arranged along each of the pair of opposing long sides 41a and 41b of the rectangular opening 41 on the lower surface of the mounting plate portion 40 and are welded and fixed to the lower surface of the mounting plate portion 40 at a plurality of welding points 51b and 52b. Each of the flat plates 51 and 52 is installed at a position facing each other across the rectangular opening 41, and the distance between the two flat plates 51 and 52 is equal to the flat diameter D of the nut 21. The longitudinal installation position of the pair of flat plates 51 and 52 with respect to the rectangular opening 41 is such that the longitudinal centers of the bending portions 51a and 52a of each of the flat plates 51 and 52 coincide with the center of the mounting plate portion 40 in the longitudinal direction of the rectangular opening 41. And the width W50 and the height H from the mounting plate portion 40 of each of the flat plates 51 and 52 are set to widths and heights suitable for preventing the rotation of the nut 21 and covering the blade hose 20 from the side.

[0019] In addition, in the vicinity of the tip (lower end) of each of the pair of flat plates 51 and 52 constituting the nut rotation prevention plate portion 50, a plurality of fixing holes 53 for inserting the fixing member 54 are formed. As shown in FIG. 1, by inserting and fixing a fixing member 54 composed of, for example, a wire through the opposing fixing holes 53 of the pair of flat plates 51 and 52, it is possible to prevent the opening of the tip side of the pair of flat plates 51 and 52. Thereby, it is possible to prevent a decrease in the function of preventing the rotation of the nut 21 due to the opening of the tip side of the pair of flat plates 51 and 52.

[0020] Next, a method of attaching the attachment device 30 to the sensor 10 will be described. First, in the state before attaching the attachment device 30 to the sensor 10, the attachment portion 12 and the lid 14 of the sensor 10 are attached to the piston rod R by a plurality of attachment bolts 60. And the nut 21 of the blade hose 20 is screwed and fixed to the screw portion 13 provided on the sensor 10, and the blade hose 20 is attached to the sensor 10. In this state, after removing the plurality of attachment bolts 60, the attachment plate portion 40 of the attachment device 30 is placed on the lower surface portion 14a of the lid 14 so that each bolt insertion hole 42 aligns with each bolt hole 16 and the attachment screw 15 formed in the lid 14.

[0021] Then, select the bolt insertion holes 42 to be used among the plurality of bolt insertion holes 42, insert the screw shaft portions of the plurality of attachment bolts 60 through the selected bolt insertion holes 42 and bolt holes 16, and screw and fix them to the piston rod R. Thereby, the attachment plate portion 40 is attached to the lower surface portion 14a of the lid 14, and the lid 14 and the attachment portion 12 of the sensor 10 are attached to the piston rod R. When selecting the bolt insertion holes 42 to be used among the plurality of bolt insertion holes 42, it is preferable to select the bolt insertion holes 42 to be used so that the attachment plate portion 40 attached by the attachment bolts 60, the attachment portion 12 and the lid 14 of the sensor 10 can be stably attached.

[0022] In this configuration, with the mounting plate 40 attached to the lower surface 14a of the lid 14, the pair of flat plates 51 and 52 are positioned along the outer circumference of the nut 21 to prevent it from rotating. The pair of flat plates 51 and 52 also protect the blade hose 20 attached to the sensor 10 from the side. This prevents the nut 21 on the braided hose 20 from loosening when screwed into the threaded portion 13 on the sensor 10 side, thus avoiding the risk of the braided hose 20 detaching from the sensor 10 and exposing the cable C. Furthermore, by protecting the side of the braided hose 20 attached to the sensor 10, the risk of the braided hose 20 being damaged by vibrations is avoided.

[0023] Finally, the fastening member 54 is inserted through the opposing fastening holes 53 of the pair of flat plates 51 and 52 to fasten them. This prevents the ends of the pair of flat plates 51 and 52 from opening, and prevents a decrease in the rotation-preventing function of the nut 21 due to the ends of the pair of flat plates 51 and 52 opening. As described above, the attachment device 30 according to this embodiment includes a disc-shaped mounting plate portion 40 that is attached to the lower surface portion 14a of the lid 14, which is the flat surface portion of the sensor 10, and has a rectangular opening 41 having a width W41 in the short direction that matches the flat diameter D of the nut 21, formed from the outer edge of the mounting plate portion 40 toward the inside of the mounting plate portion 40. Furthermore, the attachment device 30 is composed of a pair of flat plates 51, 52 erected along the opposing long sides 41a, 41b of the rectangular opening 41 of the mounting plate portion 40, and includes a nut rotation prevention plate portion 50 that prevents the rotation of the nut 21 screwed and fixed to the threaded portion 13 and protects the blade hose 20 attached to the sensor 10 from the side.

[0024] As a result, the nut rotation-preventing plate portion 50 of the attachment device 30 prevents the rotation of the nut 21, which is screwed and fixed to the threaded portion 13 by a pair of flat plates 51 and 52, and also protects the blade hose 20 attached to the sensor 10 from the side. Therefore, it is possible to prevent the nut 21 on the blade hose 20 from loosening when screwed to the threaded portion 13 on the sensor 10 side, and to avoid the risk of the blade hose 20 coming off the sensor 10 and the cable C being exposed. In addition, by protecting the side of the blade hose 20 attached to the sensor 10, it is possible to avoid the risk of the blade hose 20 being damaged by vibrations.

[0025] Furthermore, according to the attachment device 30 of this embodiment, the mounting plate portion 40 has a plurality of bolt insertion holes 42 formed along its circumference for inserting the threaded shafts of mounting bolts 60 for attaching the mounting plate portion 40 to the lower surface portion 14a of the cover 14, which is the flat surface portion of the sensor 10. This allows the mounting plate portion 40 of the attachment device 30 to be easily attached to the lower surface portion 14a of the cover 14, which serves as the flat surface of the sensor 10, by inserting the threaded shaft portion of the mounting bolt 60 into a selected bolt insertion hole 42 from among the multiple bolt insertion holes 42.

[0026] Furthermore, according to the attachment device 30 of this embodiment, each of the pair of flat plates 51 and 52 constituting the nut rotation stopper plate portion 50 has a fastening hole 53 formed in it for inserting the fastening member 54. This allows the fastening member 54 to be inserted through the opposing fastening holes 53 of the pair of flat plates 51 and 52 and fastened, thereby preventing the ends of the pair of flat plates 51 and 52 from opening up, and preventing a decrease in the rotation-preventing function of the nut 21 due to the ends of the pair of flat plates 51 and 52 opening up.

[0027] Although embodiments of the present invention have been described above, the present invention is not limited thereto and can be modified and improved in various ways. For example, the shape and dimensions of the mounting plate portion 40 and the nut rotation stopper plate portion 50 that constitute the attachment device 30 are not limited to the illustrated example. Furthermore, the sensor 10 is not limited to one attached to the piston rod R, nor is it limited to one that detects the position of other components in addition to the position of the piston rod R. Furthermore, although the lower surface 14a of the lid 14 is used as an example of the flat surface of the sensor 10, any flat surface from which the threaded portion 13 for routing the cable C protrudes is acceptable, and it is not limited to the lower surface 14a of the lid 14.

[0028] Furthermore, the securing holes 53 are not necessarily required. Furthermore, the nut 21 is not limited to a hexagonal nut; it may also be a nut with other external shapes, such as a square nut. Furthermore, the mounting bolt 60 has the function of not only attaching the mounting plate portion 40 to the flat surface of the sensor 10 (the lower surface portion 14a of the cover 14), but also attaching the mounting portion 12 and cover 14 of the sensor 10 to the piston rod R. However, it is also acceptable for the mounting bolt 60 to only attach the mounting plate portion 40 to the flat surface of the sensor 10. In this case, it is preferable to use other mounting bolts to attach the mounting portion 12 and cover 14 of the sensor 10 to the piston rod R. [Explanation of Symbols]

[0029] 1. Sensor assembly 10 sensors 11 Sensor body 12 Mounting part 13 Threaded part 14 Lid 14a Bottom part (flat part) 15 Mounting screws 16 bolt holes 20 Braided Hose 21 nuts 30 Attachment device 40 Mounting plate section 41 Rectangular opening 41a, 41b Longer side 42 Bolt insertion holes 50 Nut rotation stopper plate section 51 flat plate 51a Bend part 51b Welded area 52 flat plate 52a Bend part 52b Welding locations 53 Lashing hole 54 Binding components 60 Mounting bolts C Cable R Piston Rod

Claims

1. An attachment device used in a sensor assembly, wherein the blade hose is attached to the sensor by screwing a nut provided on the blade hose, which protects the cable that is led out through a threaded portion protruding from the flat surface of the sensor, onto the threaded portion, A disc-shaped mounting plate portion attached to the flat surface of the sensor, wherein a rectangular opening having a width in the short direction that matches the flat diameter of the nut is formed from the outer edge of the mounting plate portion toward the inside of the mounting plate portion, An attachment device characterized by comprising a pair of flat plates erected along each of the opposing long sides of the rectangular opening of the mounting plate, the pair of flat plates preventing the rotation of the nut screwed and fixed to the threaded portion, and protecting the blade hose attached to the sensor from the side.

2. The attachment device according to claim 1, characterized in that a plurality of bolt insertion holes are formed along the circumference of the mounting plate portion for inserting the threaded shaft portion of a mounting bolt for attaching the mounting plate portion to the flat surface of the sensor.

3. The attachment device according to claim 1 or 2, characterized in that each of the pair of flat plates constituting the nut rotation stopper plate portion has a fastening hole formed in it for inserting a fastening member.

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