JP4066854B2 - Sensor attachment / detachment tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sensor attaching / detaching tool for attaching / detaching a sensor main body fixed to a ceiling.
[0002]
[Prior art]
Regarding a sensor that is attached to the ceiling and senses heat, smoke, or the like, the structure of a sensor attaching / detaching tool for attaching / detaching the external cover of the sensor or the sensor body is disclosed in Japanese Utility Model Laid-Open No. 3-030195 and Japanese Patent Laid-Open No. 8-339486. It is disclosed in the gazette. These sensor attaching / detaching tools have a structure in which a support made of rubber or soft resin and having an opening is attached to the tip of a rod. The operator stands at the bottom of the sensor, grasps the rod, inserts the opening of the support portion into the sensor body, and rotates the rod to remove the sensor body or the external cover. is there.
[0003]
FIG. 9 shows an external cover attaching / detaching tool for a sensor disclosed in Japanese Utility Model Laid-Open No. 3-030195. FIG. 9A is a side view of the sensor, and FIG. 9B is a perspective view of the external cover attaching / detaching tool. The outer cover attaching / detaching tool has an arcuate engaging claw 61 and an engaging groove 62 for engagement on the inner peripheral surface of the opening 13 of the support portion 12. In this device, the engaging groove 62 is engaged with the vertical frame member (rib) 34 of the sensor wearing cover, so that the torque for rotating the rod is transmitted. Further, the arcuate engagement claw 61 engages and locks the bottom surface plate (the flange portion) 33, thereby fulfilling the function of preventing the outer cover attaching / detaching tool from falling. In addition, since a plurality of engagement stages are formed in the opening 13 of the external cover attaching / detaching tool, it is possible to cope with a plurality of types of external covers.
[0004]
FIG. 10 shows the structure of a sensor attaching / detaching tool disclosed in JP-A-8-339486. 10A is a side view of the sensor base, the sensor body, and the sensor attachment / detachment tool. FIG. 10B is a cross-sectional view of the sensor body taken along the line XX, and FIG. It is sectional drawing of the YY surface of a sensor attachment / detachment tool. In this device, the sensor body 32 and the opening 13 of the sensor attaching / detaching tool are non-circular. If the opening 13 is fitted into the sensor main body 32 and the rod 11 is rotated, torque is transmitted and the sensor main body 32 can be attached to and detached from the base portion 31 without spinning.
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. 3-030195 (page 6-9, FIGS. 7 and 8)
[0006]
[Patent Document 2]
JP-A-8-339486 (page 4-5, FIG. 1)
[0007]
[Problems to be solved by the invention]
In the external cover attaching / detaching tool for the sensor shown in FIG. 9 described above, if the shape of the arc-shaped engaging claw 61 is increased in order to surely prevent dropping, the resistance when the bottom plate 33 is fitted and locked increases. It was. On the other hand, if the shape of the arcuate engagement claw 61 is reduced in order to easily engage and lock the bottom plate 33, it will fall if the balance of the external cover attaching / detaching tool is not good when the operator releases the hand. There was a greater risk of doing so.
[0008]
Further, in the sensor attaching / detaching tool shown in FIG. 10, when the cross-sectional shape of the support 12 is large, the frictional force between the support 12 and the sensor main body 32 becomes weak and the rod is rotated. There was also a risk of spinning around. On the other hand, when the cross-sectional shape of the support 12 is small, the resistance when the support 12 is fitted into the sensor body 32 is large.
[0009]
The present invention has been made in view of such a reason, and the object of the present invention is to attach and detach a plurality of types of sensor bodies having bottom plates with different outer diameters and to attach the sensor. It is an object of the present invention to provide a sensor attaching / detaching tool that can be easily engaged, can generate a sufficient transmission torque during attachment / detachment work, and does not easily drop during the operation.
[0010]
[Means for Solving the Problems]
A sensor attaching / detaching tool according to a first aspect of the present invention includes a rod body and an elastic support body having a substantially cylindrical opening at the tip of the rod body, and is secured to the ceiling via a base portion. In a sensor attaching / detaching tool for attaching / detaching a sensor main body by inserting and rotating a substantially circular bottom plate provided at the lower end of the main body into the opening, the bottom plate and the inner peripheral surface of the opening A plurality of engaging steps are provided, and the engaging step is provided with an engaging step that engages a bottom plate having a large diameter on the front side with respect to the insertion direction of the opening, and a side surface of each engaging step. A pressing portion that presses against the outer peripheral end surface of the bottom plate at a position opposite to the protruding portion, and a locking portion that hooks on the upper outer periphery of the bottom plate protrudes on the side surface of the engagement step between the pressing portions, by pinching the outer peripheral end face of the bottom plate in the press-contact portion, which is detachably said sensor body, said supporting A groove or a notch is provided in the upper peripheral portion of the body in the radial direction to divide the upper peripheral portion in the circumferential direction to form a divided peripheral portion, and press contact with the side surface of each engagement step of the divided peripheral portion. Each of the divided peripheral portions is provided with either a pressure contact portion or a locking portion on the side surface of each engagement step, and the engagement step has two steps, and the upper engagement step A locking portion is provided on a side surface of the lower engaging step of the divided peripheral portion provided with the pressure contact portion on the side surface of the lower peripheral portion of the dividing peripheral portion provided with a locking portion on the side surface of the upper engaging step. A pressure contact portion is provided on the side surface, and the pressure contact portions and the locking portions are alternately provided adjacent to each divided peripheral portion .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
A sensor attaching / detaching tool according to the present embodiment will be described with reference to FIGS. 1 is a perspective view of the sensor attaching / detaching tool of the present embodiment, FIG. 2 is a top view of the same object, FIG. 3 is a longitudinal sectional view of the same object, and FIGS. 4 (a) and 4 (b) are pressure contact portions. FIG. 5 is an enlarged view of a vertical cross-sectional view of the locking portion, FIG. 5 is a vertical cross-sectional view showing a state in which the bottom plate having a small outer diameter is engaged, and FIG. 6 is a state in which the bottom plate having a large outer diameter is engaged. FIG. 7 is a perspective view showing a mounting state of the sensor main body of the present embodiment, and FIG. 8 is a perspective view showing another mounting structure portion of the sensor main body of the present embodiment.
[0015]
As shown in FIGS. 1 to 4, the sensor attaching / detaching tool 1 includes a hard resin or wooden rod 11 and a support 12 made of elastically deformable rubber or soft resin. A substantially cylindrical opening 13 is provided on the upper portion of the support 12, and two engagement stages of a lower engagement stage 15 of an upper engagement stage 14 are provided on the inner peripheral surface of the opening 13. Thus, the diameter of the side surface of the upper engagement stage 14 is larger than the diameter of the side surface of the lower engagement stage 15. Further, eight grooves 16a to 16h are provided in the upper peripheral portion of the support 12 in the radial direction, and the upper peripheral portion is equally divided in the circumferential direction, thereby forming eight divided peripheral portions 17a to 17h. is doing. Further, the upper engagement stage 14 of each of the divided peripheral portions 17 a to 17 h is provided with a pressure contact part 21 and an engagement part 22, and a side surface of the lower engagement stage 15 is provided with a pressure contact part 23 and an engagement part 24. Each of the engaging stages 14 and 15 has a structure in which bottom plates of different sensors having different outer diameters are fitted. Here, in each of the engagement stages 14 and 15, the press contact portions 21 and 23 and the locking portions 22 and 24 are provided alternately adjacent to each other in the divided peripheral portions 17 a to 17 h. Further, as shown in the top view of FIG. 2, for each of the divided peripheral portions 17 a to 17 h, the lower portions of the divided peripheral portions 17 a, c, e, and g provided with the press contact portion 21 on the side surface of the upper engagement stage 14. A locking portion 22 is projected on the side surface of the joint step 15, and is provided on the side surface of the lower engagement step 15 of the divided peripheral portions 17 b, d, f, and h, each having a locking portion 23 on the side surface of the upper engagement step 14. The press contact portion 24 is provided in a protruding manner. For example, as shown in the cross-sectional view of C-O shown in FIG. 4A, the side surface of the lower engagement step 15 of the divided peripheral portion 17a is an arc-shaped plate having a thickness of about 2 mm, and the tip side surface is a plan view. The locking portion 24 is formed so as to be disposed slightly inside the outer peripheral end surface of the bottom plate to be fitted in. Further, a pressure contact portion 21 that circumscribes the outer peripheral end face of the bottom plate to be fitted is formed on the side surface of the upper engagement step 14. Here, the upper outer edge portion of the locking portion 24 is chamfered. Further, as shown in the cross-sectional view of D-O in FIG. 4B, the divided peripheral portions 17b and 17h adjacent to the divided peripheral portion 17a are respectively provided with the pressure contact portions 23 on the side surfaces of the lower engagement stage 14. A locking portion 22 is provided on the side surface of the upper engagement stage 14. The shapes of the pressure contact portion 23 and the locking portion 22 are substantially the same as the pressure contact portion 21 and the locking portion 24.
[0016]
As shown in FIG. 7, the sensor includes a base portion 31 and a sensor body 32. The base portion 31 is fixed to the ceiling 5 with screws or the like, and the sensor main body 32 is fixed to the base portion 31. As shown in FIG. 7, the male screw 41 is formed on the outer peripheral surface of the base portion 31 and the female screw 42 is formed on the inner peripheral surface of the upper portion of the sensor body 32. There is a configuration for screwing together. As another configuration, as shown in FIG. 8, a long hole 43 in the rotation direction when the support 11 is attached to the base 31 and an insertion hole 44 larger than this at one end of the long hole 43 are combined. A plurality of holes are provided, and a locking bracket 45 is provided at a location of the sensor body 32 corresponding to the insertion hole 44. The locking bracket 45 is inserted into the insertion hole 44 and rotated to thereby rotate the sensor body. There exists a structure which attaches 32 to the base part 31. FIG.
[0017]
A sensor (not shown) for sensing heat and smoke is incorporated in the sensor body 32. Further, the sensor body 32 is provided with an external cover 34 for preventing dust and the like from entering the sensor from the outside. The outer cover 34 has a cylindrical shape and is provided with a circular bottom plate 33 at the lower end, and a vertical frame member 35 that is integrally formed with the bottom plate and holds the bottom plate 33 in the vertical direction on the side surface, An annular lateral frame reinforcing material that is joined to this and reinforced in the horizontal direction is provided. A dustproof net 36 is provided inside the outer cover 34.
[0018]
Below, the operation | work which removes the sensor main body 32 from the base part 31 is demonstrated. First, an operator stands on the floor below the sensor body 32 by grasping the rod 11 of the sensor attaching / detaching tool 1. Next, the sensor attaching / detaching tool 1 is disposed immediately below the sensor main body 32 so that the opening 13 of the support 12 covers the bottom plate 33 of the sensor main body 32 to be engaged. In this state, the operator pushes up the rod 11 in the vertical direction. In the case of the bottom plate 33 having a small diameter, as shown in the cross-sectional view of EOF in FIG. 2 shown in FIG. Thus, it is hooked on the bottom plate 33. Further, the front end side surfaces of the pair of press contact portions 23 formed at the positions opposite to the side surfaces of the lower engagement step 15 are in contact with the outer peripheral end surfaces of the bottom plate 33 so that the bottom plate 33 is sandwiched from both sides. On the other hand, in the case of the bottom plate 33 having a large diameter, as shown in the cross-sectional view of EOF in FIG. 2 shown in FIG. After getting over 33, it is in a state of being hooked on the bottom plate 33. Further, the tip side surfaces of the pair of press contact portions 21 projecting at the positions opposite to the side surfaces of the upper engagement stage 14 are in contact with the outer peripheral end surfaces of the bottom plate 33 so as to sandwich the bottom plate 33 from both sides. . When the operator rotates the rod body 11 with the support portion 12 and the sensor main body 32 engaged in this way, the frictional force between the distal end side surfaces of the press contact portions 21 and 23 and the outer peripheral end surface of the bottom plate 33 is obtained. As a result, the torque of the rod 11 is transmitted, and the sensor body 32 also rotates without spinning. Here, even if the engagement structure between the sensor main body 32 and the base portion 31 is the screwing of the female screw 41 and the male screw 42 as shown in FIG. 7, the locking metal fitting 45 as shown in FIG. Even when the sensor body 32 is inserted into the insertion hole 44, the sensor body 32 is removed from the base portion 31 by rotating the sensor body 32 with the sensor attaching / detaching tool 1. Then, when the operator holds the sensor body 32 by hand and the operator pulls the rod 11, the support portion 12 and the sensor body 32 are disengaged.
[0019]
On the contrary, the operation of attaching the sensor main body 32 to the base portion 31 is as follows. In the state where the sensor main body 32 is inserted into the engagement stage that matches the diameter of the support body 12 in advance, the operator grasps the rod body 11 and directly below the base portion 31 that attaches the sensor main body 32 to the ceiling 5. Arrange. Here, if the engagement structure between the sensor main body 32 and the base portion 31 is as shown in FIG. 7, the sensor main body 32 is rotated by the sensor attaching / detaching tool 1 so that both screws are screwed together. Move. Further, in the case as shown in FIG. 8, the sensor main body 32 is rotated after the locking metal fitting 45 is inserted into the insertion hole 44. In this way, the sensor main body 32 is attached to the base portion 31 by rotating in the direction opposite to the aforementioned direction. Then, when the operator pulls the rod 11, the sensor attaching / detaching tool 1 is released from the sensor main body 32.
[0020]
Here, on the inner peripheral surface of the opening portion 13 of the support portion 12, there are provided two engagement stages having different diameters, ie, an upper engagement stage 14 and a lower engagement stage 15, and separate sensings having different outer diameters. It has a structure in which the main body is inserted. For this reason, it is possible to attach and detach two types of sensors having different outer diameters with one sensor attaching / detaching tool 1.
[0021]
Further, the tip side surfaces of the pressure contact portions 21 and 23 of each of the divided peripheral portions 17a to 17h are shaped to circumscribe the outer peripheral end surface of the bottom plate 33, and the upper portion of the upper outer edge portion is chamfered. Accordingly, the contact friction between the outer peripheral end surface of the bottom plate 33 and the press contact portion 15 when the sensor attaching / detaching tool 1 is pushed up is small. The front end side surfaces of the locking portions 22 and 24 are formed so as to be slightly inside the outer peripheral end surface of the bottom plate 33. For this reason, the locking portions 22 and 24 easily get over the bottom plate 33 and are hooked on the bottom plate 33 by elastic deformation. Furthermore, the upper peripheral portion of the support 12 is in a state where the divided peripheral portions 17a to 17h are divided by the grooves 16a to h. For the divided peripheral portions 17a to 17h, only one of the press contact portions 21 and 23 or the locking portions 22 and 24 is provided on the side surfaces of the respective engagement steps 14 and 15. Therefore, when the support body 12 and the sensor main body 32 are engaged with each other, the divided peripheral portions 17a to 17h can be elastically deformed independently without being greatly affected by each other. With the above configuration, the support portion 12 of the sensor attaching / detaching tool 1 and the sensor main body 32 can be engaged with each other with a small resistance. Conversely, the engagement between the two can be released with a small resistance.
[0022]
Further, when the support portion 12 and the sensor main body 32 are engaged, the press contact portions 21 and 23 are in a state of sandwiching the bottom plate 33 from the opposed positions of the side surfaces of the engagement stages 14 and 15. Therefore, when the support body 12 rotates, a frictional force acts reliably between them, and torque is transmitted. Further, when the support 12 is rotated, the pressure contact portions 21 and 23, which are elastic bodies, are deformed by the frictional force with the outer peripheral end surface of the bottom plate 33, thereby increasing the adhesion between them, and the frictional force is further increased. Thus, torque can be transmitted easily.
[0023]
Furthermore, when the support portion 12 and the sensor main body 32 are engaged, the locking portions 22 and 24 are hooked on the upper surface of the bottom plate 33 even if the operator releases the hand. Never fall. In particular, since the four locking portions 22 and 24 and the pressure contact portions 21 and 23 are alternately adjacent to each other, the balance in a state in which the operator has released his hand is good and is difficult to fall.
[0024]
Further, the locking portion 2 is provided on the side surface of the lower engagement step 15 of the divided peripheral portion 17 provided with the pressure contact portion 21 on the side surface of the upper engagement step 14, and the locking portion 22 is provided on the side surface of the upper engagement step 14. A pressure contact portion 23 is provided on the side surface of the lower engagement step 15 of the divided peripheral portion 17 provided with the above. That is, in one divided peripheral portion 17, there are no locking portions at both the upper engagement step 14 and the lower engagement step 15. For this reason, when manufacturing the support body 12 by a metal mold | die, the metal mold | die extraction process becomes easy and productivity improves.
[0025]
Note that the total number of the divided peripheral portions having the locking portions and the pressure contact portions of the respective engagement steps may not be eight as in the present embodiment. Even if the number is small or large, the sensor body can be attached and detached by transmitting torque by rotating the sensor attaching / detaching tool. Further, the number of the locking portions and the pressure contact portions may not be the same. For example, if the number of locking parts to be protruded is larger than the number of pressure contact parts, the generated torque is reduced, but the sensor attachment / detachment tool is well balanced when the operator releases his hand and does not fall easily Can be manufactured. In addition, even if each engagement stage is provided with a divided peripheral portion provided with neither a locking portion nor a pressure contact portion, the function of the sensor attaching / detaching tool is not significantly deteriorated. Further, if three or more engagement stages are provided, it is possible to attach and detach various types of sensors having an outer diameter corresponding to the number of stages.
[0026]
【The invention's effect】
A sensor attaching / detaching tool according to a first aspect of the present invention includes a rod body and an elastic support body having a substantially cylindrical opening at the tip of the rod body, and is secured to the ceiling via a base portion. In a sensor attaching / detaching tool for attaching / detaching a sensor main body by inserting and rotating a substantially circular bottom plate provided at the lower end of the main body into the opening, the bottom plate and the inner peripheral surface of the opening A plurality of engaging steps are provided, and the engaging step is provided with an engaging step that engages a bottom plate having a large diameter on the front side with respect to the insertion direction of the opening, and a side surface of each engaging step. A pressing portion that presses against the outer peripheral end surface of the bottom plate at a position opposite to the protruding portion, and a locking portion that hooks on the upper outer periphery of the bottom plate protrudes on the side surface of the engagement step between the pressing portions, The sensor main body is attached and detached by holding the outer peripheral end surface of the bottom plate at the press contact portion. Therefore, it is possible to attach and detach a plurality of sensor bodies with different outer diameters, engage the support part of the sensor attachment / detachment tool and the sensor body with a small resistance, and work when attaching / detaching. Even if a person releases his / her hand, the sensor attachment / detachment tool is difficult to fall.
[0027]
Further, a groove or a cut is provided in the upper peripheral portion of the support body in the radial direction to divide the upper peripheral portion in the circumferential direction to form a divided peripheral portion, and each engagement stage of the divided peripheral portion since the said side to become provided pressure contact portion or locking portion of the divided peripheral portion without much influenced by each other, independently when fitting the said opening in said sensor body It becomes elastically deformable, and the support part of the sensor attaching / detaching tool and the sensor main body can be engaged with a smaller resistance.
[0028]
Further, since the side surface of each engagement step is characterized by formed by providing only one of the pressure contact portion or locking portion for the divided peripheral portion, when fitting the said opening in said sensor body The pressing portion and the locking portion can be elastically deformed independently without much influence from each other, and the support portion of the sensor attaching / detaching tool and the sensor body are engaged with a smaller resistance. Can be made. Furthermore, since the press contact portion and the locking portion are alternately adjacent to each other, the balance when the operator releases the hand when the indicating portion and the sensor body are engaged is provided. Good and hard to fall.
[0029]
Further, the engagement stage has two stages, and a locking portion is provided on a side surface of the lower engagement stage of the divided peripheral portion provided with a pressure contact part on a side surface of the upper engagement stage. Since the press contact portion is provided on the side surface of the lower engaging step of the divided peripheral portion provided with the locking portion on the side surface, when the support body is manufactured by the die, the die removing step is performed. It becomes easy and productivity improves.
[Brief description of the drawings]
FIG. 1 is a perspective view of a sensor attaching / detaching tool according to an embodiment.
FIG. 2 is a top view of the sensor attaching / detaching tool of the present embodiment.
FIG. 3 is a cross-sectional view of the sensor attaching / detaching tool according to the present embodiment.
FIG. 4 is a cross-sectional view of a locking portion of the sensor attaching / detaching tool according to the present embodiment.
FIG. 5 is a cross-sectional view showing a state where the sensor attaching / detaching tool of the present embodiment is engaged with the sensor.
FIG. 6 is a cross-sectional view showing a state where another sensor attaching / detaching tool of the present embodiment is engaged with the sensor.
FIG. 7 is a perspective view showing a sensor body mounting structure according to the present embodiment.
FIG. 8 is a perspective view showing a fitting for mounting structure of the sensor body of the present embodiment.
FIG. 9 is a side view of a conventional sensor and a sensor attaching / detaching tool.
FIG. 10 is a perspective view of another conventional sensor and a sensor attaching / detaching tool.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sensor attachment / detachment tool 11 Rod body 12 Support body 13 Opening part 14 Upper locking step 15 Lower locking step 16a-h Groove 17a-h Division | segmentation peripheral part 21, 23 Press-contact part 22, 24 Locking part 31 Base part 32 Sensing Main unit 33 Bottom plate 34 External cover 35 Vertical frame member 36 Dustproof net 5 Ceiling

Claims (1)

A rod body and a substantially circular bottom plate provided at the lower end of the sensor body, which is provided with an elastic body support having a substantially cylindrical opening at the tip of the rod body and fixed to the ceiling via the base portion. In the sensor attaching / detaching tool for attaching and detaching the sensor main body by inserting and rotating in the opening, a plurality of engagement steps for engaging with the bottom plate are provided on the inner peripheral surface of the opening. The mating step is provided with an engagement step that engages with a bottom plate having a large diameter on the front side with respect to the insertion direction of the opening, and presses the outer peripheral end surface of the bottom plate at a position opposite to the side surface of each engagement step. Protruding a press-contact portion, projecting a locking portion to be hooked on the outer peripheral upper side of the bottom plate on the side surface of the engagement step between the press-contact portions, and sandwiching the outer peripheral end surface of the bottom plate with the press-contact portion by, which attaching and detaching the said sensor body, the grooves also in the radial direction in the upper periphery of the support By dividing the upper peripheral portion in the circumferential direction by providing a cut, a divided peripheral portion is formed, and a press contact portion or a locking portion is provided on a side surface of each engagement stage of the divided peripheral portion. Only the pressure contact portion or the locking portion is provided on the side surface of each engagement step, the engagement step is two steps, and the lower side of the divided peripheral portion provided with the pressure contact portion on the side surface of the upper engagement step A locking portion is provided on the side surface of the engagement step, and a pressure contact portion is provided on the side surface of the lower engagement step of the divided peripheral portion provided with the locking portion on the side surface of the upper engagement step. A sensor attachment / detachment tool , wherein the pressure contact portions and the locking portions are alternately adjacent to each other .

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