JP3032384U - Object contact force detector - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: When a screw rolls into a bumper, the sensitivity cannot be adjusted at all, and the screw exists between the mounting plate and the pressing plate. When adjusting the sensitivity, there was a problem that the screw that rolled in was an obstacle. A mounting plate mounted on a bumper of a vehicle, a screw screwed to a nut fitted and fixed to the mounting plate, and a longitudinal movement by adjusting a screwing degree of the screw to the nut. A receiving plate, a switch element that is mounted on the front surface of the receiving plate and wraps a pair of electrodes insulated by a flexible insulating material with a covering material, and a pressing plate that sandwiches the switch element with the receiving plate, In a contact force detecting device for an object, which comprises a sponge arranged on the front surface of a pressing plate and a covering film covering the sponge and the mounting plate, the tip of the screw is a shaft portion having a diameter smaller than the screw portion, and It is a contact force detection device for an object in which a small hole into which the shaft portion is inserted is formed in a nut.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention is mounted on a bumper such as a vehicle, for example, an automated guided vehicle, a forklift that transports articles in a factory or a warehouse, and detects when the vehicle contacts an article (including a person) while traveling, The present invention relates to an improvement in an object contact force detection device for automatically stopping the vehicle.

[0002]

[Prior art]

 As a conventional object contact force detecting device, for example, there is an object detecting device described in Japanese Utility Model Publication No. 5-28500 filed previously by the present applicant. Hereinafter, this conventional example will be described with reference to FIGS.

FIG. 3 shows an external view of an automated guided vehicle, and bumpers 2 are attached to the front and rear of the guided vehicle 1. The bumper 2 has a structure as shown in FIG. 4, and its details are as follows. A mounting plate 21 such as a plywood plate having a hole 21a to be mounted on the automatic guided vehicle 1, and a nut mounted to the hole 21a of the mounting plate. 22, a screw 23 screwed to the nut 22, and a base plate 24 made of rubber or the like that is adhesively fixed to the front surface side of the mounting plate 21 and has a hole 24a in the portion of the nut 22. The receiving plate 25 made of rubber or the like, which is located in the hole 24a of the base plate 24 and is moved back and forth by rotating the screw 23, is arranged so that one surface is in contact with the base plate 24 and the receiving plate 25. A pressure sensor 26, a pressing plate 27 made of soft rubber or the like arranged so as to cover the front surface of the pressure sensor 26, and a sponge 28 having a relatively large thickness arranged on the front surface side of the pressing plate 27. Cover the sponge 28, It is more structure and the cover film 29 of plastic or the like which is fixed to the urging plate 21.

The above-described pressure-sensitive sensor 26 has a structure shown in FIGS. 5 and 6, and its details are such that a tape-shaped switch element 26c is sandwiched between a pair of hard rubber plate-shaped bodies 26a and 26b. It is a composition. A pair of plate-like body 26a, the 26b, the recess 26a _1, 26b ₁ in the direction perpendicular to the longitudinal direction, the convex portions 26a _2, 26b ₂ are formed alternately, the plate in the recess 26a ₁ of the plate-like body 26a The convex portion 26b ₂ of the body 26b and the convex portion 26a ₂ of the plate-shaped body 26a ₁ fit into the concave portion 26b ₁ of the plate-shaped body 26b.

A shallow groove 26a _{3 in} which the switch element 26c is arranged is formed at the center in the longitudinal direction of each plate 26a. On the other hand, the switch element 26c includes an electrode 26c _1, 26c ₂ which is a pair of opposing, with the electrodes 26c _1, 26c ₂ between flexible insulating material 26c ₃ for insulating, the electrode 26c _1, 26c ₂ and the insulating material 26c ₃ It is composed of a flexible covering material 26c ₄ such as vinyl covering the above. A ridge 26c ₅ is formed in the longitudinal direction of one surface of the covering material 26c ₄ .

The switch element 26c configured in this manner is arranged in the groove 26a ₃ formed in the plate-like bodies 26a and 26b with the protrusion 26c ₅ facing upward, and the plate-like bodies 26a and 26b are integrated. Then, the operation when the automatic guided vehicle 1 having the switch element 26c incorporated in the bumper 2 comes into contact with an article during traveling will be described below.

When the bumper 2 comes into contact with the object, the contact force is transmitted to the pressure sensor 26 via the vinyl leather 29, the sponge 28 and the pressing plate 27. If the contact force is transmitted, the electrode 26 c ₂ through the protrusions 26c ₅ of the switching element 26c via a plate-like body 26a, so that pressing on the electrode 26c ₁ side, the electrodes 26c _1, 26c ₂ is Upon contact, the switch is turned on, and it can be detected that the bumper 2 has come into contact with an article, and the automatic guided vehicle 1 can be stopped by the detection output.

In the pressure-sensitive sensor 26 described above, in order to adjust the sensitivity when an object contacts, the screw 23 is rotated to move the receiving plate 25 back and forth, that is, the screw 23 is screwed in. Since the receiving plate 25 moves forward to compress the sponge 28, the sensitivity becomes high, and when the screw 23 is loosened, the sensitivity becomes low and the sensitivity can be adjusted.

[0009]

[Problems to be solved by the device]

 By the way, in the above-mentioned sensitivity adjustment, when the screw 23 is screwed into the nut 22 in order to increase the sensitivity, the screw 23 enters the inside of the mounting plate 21, and if screwed too much, the screw 23 comes off from the nut 22. Then, it will roll into the bumper 2.

When the screw 23 rolls in the bumper 1, specifically, between the mounting plate 21 and the pressing plate 25, the sensitivity cannot be adjusted at all, and the screw 23 moves between the mounting plate 21 and the pressing plate 25. However, there is a problem in that the screw 23 that has fallen into the hindrance interferes with the screw 23 that has rolled in when the sensitivity is adjusted by a new screw.

The present invention is intended to solve the above-mentioned problems, and it is an object of the present invention to prevent the screwing of a certain amount even if the screw for adjusting the sensitivity is screwed in, thereby preventing the screwing of the bumper. The purpose is to provide a device for detecting the contact force of an object that prevents it from rolling inside.

[0012]

[Means for Solving the Problems]

 The object contact force detecting device of the present invention is intended to achieve the above-mentioned object, and its means is to attach to a vehicle bumper and a nut fitted and fixed to the attaching plate. The screwed screw, the receiving plate that moves back and forth by adjusting the screwing degree of the screw with respect to the nut, and the pair of electrodes insulated by the flexible insulating material attached to the front surface of the receiving plate. Object consisting of a switch element wrapped in a covering material, a pressing plate sandwiching the switch element with the receiving plate, a sponge arranged in front of the pressing plate, and a covering film covering the sponge and the mounting plate. In the contact force detecting device, the tip of the screw is formed as a shaft portion having a diameter smaller than that of the screw portion, and a small hole into which the shaft portion is fitted is formed in the nut.

Further, it is preferable that the switch element is sandwiched between two plate-shaped members made of hard rubber, and further, the two plate-shaped members are formed with a concave portion and a convex portion which are fitted to each other. At the same time, a shallow groove is formed in the longitudinal direction in which the switch element is mounted, and a ridge is formed on the surface of the covering material of the switch element. It is desirable to sandwich the plate-shaped body facing the plate-shaped body on which the shallow groove is not formed.

[0014]

[Embodiment of device]

 Hereinafter, details of the object contact force detecting apparatus according to the present invention will be described with reference to FIGS. The same reference numerals as those in the above-mentioned conventional example indicate the same members, and the description thereof will be omitted. In the figure, 3 is a screw and 4 is a nut, which correspond to the screw 23 and the nut 22 of the conventional example.

A feature of the present invention is that the head is a minus screw or a hexagon socket screw, and the tip is a screw 3 having a shaft portion 32 having a diameter smaller than the diameter of the screw portion 31, and the mounting plate. 21 is inserted into the hole 21a from the back side of the nut 21 and the tip of the nut 4 that is fixed by the claw 41 biting into the mounting plate 21 is fixed. That is, the holes 42 are formed.

By thus forming the screw 3 and the nut 4, when the screw 3 is screwed into the nut 4 and moved forward, the shaft portion 32 of the screw 3 projects from the small hole 42 of the nut 4, and the shaft portion 32 The receiving plate 25 located at the tip of 32 is pressed, and as a result, the switch element 26 is pressed toward the pressing plate 27, and the sensitivity of the switch element 26 increases.

By the way, when the screw 3 is screwed in to increase the sensitivity of the switch element 26, the tip of the screw portion 31 comes into contact with the small hole 42 of the nut 4 and prevents further advancement. Becomes Therefore, the screw 3 does not come off from the nut 4 and falls between the mounting plate 21 and the receiving plate 25 as in the conventional case, and the screw 3 is lost or the screw 3 prevents the receiving plate 25 from moving back and forth. There is nothing to do.

Further, since the switch element 26 is located between the receiving plate 25 and the pressing plate 27 while being sandwiched between the two plate-like bodies 26a and 26b, the elongated tape-shaped switch element 26 moves. Since the two plate-like bodies 26a and 26b are formed with the convex portions 26a ₁ and 26b ₁ and the concave portions 26a ₁ and 26b ₂ which are fitted to each other, The bodies 26a and 26b are not displaced.

Further, by forming the protrusions 26c ₅ on the switch element 26c, the external pressure applied to the plate-like body 26b is transmitted to the protrusions 26c ₅ , and even if a small external force is applied, it is greatly deformed. Therefore, the sensitivity of the switch element 26c is improved.

[0020]

[Effect of device]

 As described above, according to the present invention, the tip of the screw for adjusting the sensitivity of the switch element is a shaft portion having a diameter smaller than that of the screw portion, and the shaft portion is fitted into a nut to which the screw is screwed. By forming the hole, even if the screw is screwed in, the threaded portion of the screw abuts the small hole to prevent further screwing, and the screw does not enter between the mounting plate and the receiving plate. The screws will not be lost and the screws will not interfere with the back-and-forth movement of the backing plate.

Further, since the switch element is located between the receiving plate and the pressing plate in a state of being sandwiched between the two plate-like bodies, there is no possibility that the elongated tape-like switch element will move, and Since the two plate-shaped bodies are formed with the convex portions and the concave portions that are fitted to each other, the two plate-shaped bodies are not displaced, and the ridges are formed on the switch element. The external pressure applied to the cylindrical body is transmitted in a protruding manner, and even if a small external force is applied, it is greatly deformed, and therefore, the sensitivity of the switch element is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an essential part of an object contact force detection device according to the present invention.

FIG. 2 is a partially enlarged sectional view of the above.

FIG. 3 is a perspective view of an automatic guided vehicle incorporating the contact force detection device of the present invention.

FIG. 4 is an enlarged sectional view of a bumper portion of the above.

FIG. 5 is a perspective view of a pressure-sensitive sensor portion of the above.

FIG. 6 is a cross-sectional view of a switch element.

[Explanation of symbols]

1 AGV 2 bumper 21 mounting plate 24 units plates 25 receiving plates 26 pressure sensor 26a, 26b plate body 26a _1, 26b ₁ protrusion 26a _2, 26b ₂ recesses 26a ₃ shallow groove 26c switching element 27 pressing plate 28 Sponge 29 Covering film 3 Screw 31 Screw part 32 Shaft part 4 Nut 42 Small hole

Claims (3)

[Scope of utility model registration request] 1. A mounting plate to be mounted on a bumper of a vehicle, a screw screwed to a nut fitted and fixed to the mounting plate, and a front and rear by adjusting a screwing degree of the screw to the nut. A receiving plate that moves, a switch element that is attached to the front surface of the receiving plate and that wraps a pair of electrodes insulated by a flexible insulating material with a covering material, and a pressing plate that sandwiches the switch element with the receiving plate, In a contact force detecting device for an object comprising a sponge arranged on the front surface of the pressing plate and a covering film covering the sponge and the mounting plate, the tip of the screw is a shaft portion having a diameter smaller than the screw portion, and
A contact force detecting device for an object, wherein a small hole into which the shaft portion is inserted is formed in the nut. 2. The contact force detection device for an object according to claim 1, wherein the switch element is sandwiched between two plate-like members made of hard rubber. 3. The two plate-like bodies are formed with recesses and protrusions that fit into each other, and one plate-like body is formed with a shallow groove in the longitudinal direction in which the switch element is mounted. Is
Further, a ridge is formed on the surface of the covering material in the switch element, and the ridge is sandwiched so as to face the plate-shaped body on which the shallow groove is not formed. The contact force detection device for an object according to claim 1.