JP5936948B2 - Base material detector - Google Patents

Description

  The present invention relates to a base material detector used to detect a base material such as a stud existing on the back side of an interior wall or a ceiling board made of, for example, gypsum board.

  Conventionally, as disclosed in the following patent documents, this kind of base material detector is fixed to the outer case and the tip of the outer case, and is composed of a gypsum board or the like (hereinafter referred to as a plaster board). A detection needle made of stainless steel that can be pierced into the interior wall), a cylindrical needle case that is nested at the tip of the outer case and can move in the longitudinal direction on the outer periphery of the detection needle, and this needle case It is known to include a coil spring that constantly biases the detection needle in a direction in which the detection needle is in an immersive state.

  In other words, when checking the presence or absence of a pillar between the walls, this base material detection tool holds the outer case with a hand and brings the tip of the needle case into contact with an arbitrary position on the surface of the interior wall made of gypsum board or the like. By pushing the outer case toward the interior wall, the detection needle protrudes from the tip of the needle case and is inserted into the interior wall, while the needle case is stopped with the tip in contact with the surface of the interior wall. As a result, the coil spring is retracted relative to the detection needle while being compressed, and is immersed in the outer case. And in places where there is no base material such as studs or bars on the back side, the detection needle penetrates the interior wall and the piercing resistance is reduced, but in places where the base material is present, the tip of the detection needle is on the interior wall. Since the penetration resistance suddenly increases when it reaches the back surface and hits the base material, it can detect the presence or absence of the base material, and the relative retraction amount of the needle case, that is, the penetration depth of the detection needle It is confirmed by the scale displayed on the outer peripheral surface of the needle case, and thereby the depth of the base material from the interior wall can be confirmed.

  Further, the outer case is provided with a lock mechanism that can be switched to a locked state that prevents the needle case from retreating by a rotation operation of the switching member or a free state that allows the needle case to retreat backward. If the needle case is locked by operating the switching member when not in use, the needle case is prevented from moving backward with the detection needle immersed (covered). Even when you put your hand into a tool bag and take out the tool, even if you press the needle case of the base material detector contained in this tool bag with your finger, the tip of the detector needle is exposed and your finger is exposed. You can prevent injuries.

JP-A-11-281756 Japanese Patent Laid-Open No. 11-281305

  However, according to the above-described conventional base material detection tool, it is necessary to rotate the switching member each time to lock the needle case or to release the locked state, which complicates the work. . In addition, when using the base material detector, if you forget to unlock the needle case, it is impossible to insert the detector needle into the interior wall. If you forget to lock the needle case when it is not in use, you may accidentally injure yourself by pushing the needle case. Sex remained.

  The present invention has been made in view of the above points, and a technical problem thereof is to provide a base material detector that eliminates the complexity of work and improves safety.

  As means for effectively solving the technical problem described above, a base material detector according to the invention of claim 1 includes a cylindrical outer case, a detection needle fixed to the outer case, and the outer case. A cylindrical needle case provided in a state in which the outer periphery of the detection needle can be moved in the longitudinal direction, and a spring that constantly urges the needle case in a direction in which the detection needle is in an immersive state, One of the inner peripheral surface and the outer peripheral surface of the needle case is provided with a stopper, and the other is restricted from relative movement of the needle case in the direction in which the detection needle is exposed by contact with the stopper. A step surface where the stopper contact is released by relative rotation of the outer case and the needle case, and a relative movement of the needle case in a direction in which the detection needle is in an immersive state, and the stopper The step surface and front And it has a cam surface for guiding a position opposite to the longitudinal direction.

  According to the configuration of the first aspect, since the stopper is in a locked state facing the step surface when the detection needle is immersed in the needle case, even if the needle case is excessively pushed in the exposure direction of the detection needle, the stopper The contact with the step surface prevents the movement of the needle case, thereby preventing the detection needle from being exposed from the needle case. When using for detecting the base material, the outer case and the needle case are rotated by rotating the outer case and the needle case relative to each other in the direction of releasing the contact between the stopper and the stepped surface, and the needle case is brought into contact with an arbitrary position such as the interior wall. By pushing the case, the needle case is inserted into the outer case and the detection needle protrudes from the tip of the needle case and is inserted into the interior wall, thereby enabling detection work. Further, when the detection needle is pulled out from the interior wall or the like, when the needle case is moved in the direction to bring the detection needle into the immersive state by the biasing force of the spring, the stopper is opposed to the step surface by the cam surface in the longitudinal direction. Will automatically lock.

  According to a second aspect of the present invention, there is provided a base material detector according to the first aspect, wherein the outer case is provided with a clip.

  According to the structure of Claim 2, since it can latch to the pocket of clothes, a tool bag, etc. with a clip, portability improves. Moreover, this clip has a function of improving the operability when the outer case and the needle case are relatively rotated in the direction of releasing the contact between the stopper and the step surface.

  According to a third aspect of the present invention, there is provided a base material detector according to the first or second aspect, wherein the head of the detection needle is loosely inserted into the needle case and holds a spring; It is fixed to the outer case via a retainer that is detachably fitted and a cap that is detachably coupled to the head of the outer case.

  According to the configuration of the third aspect, since the retainer, the holder, and the detection needle can be separated from each other by removing the cap from the head of the outer case, the detection needle can be easily replaced.

  According to a fourth aspect of the present invention, there is provided a base material detecting tool according to the third aspect, wherein the head of the detection needle is bent into an L shape, and the head is a large number extending in the radial direction formed on the holder. Is fitted with any one of the non-rotating grooves.

  According to the configuration of claim 4, since the detection needle is prevented from rotating relative to the outer case via the holder and the spring, when the detection needle is pulled out, an appropriate rotation can be given to the detection needle, For this reason, extraction can be performed easily.

  According to the base material detector according to the present invention, the needle case is usually automatically locked, and inadvertent exposure of the detection needle is prevented, so that safety is improved and the locked state is easily released during use. Therefore, usability can be improved.

It is a side view which shows preferable embodiment of the base material detection tool which concerns on this invention. It is sectional drawing which shows preferable embodiment of the base material detection tool which concerns on this invention. It is an exploded view which shows preferable embodiment of the base material detection tool which concerns on this invention. It is sectional drawing of the locked state which shows preferable embodiment of the base material detection tool which concerns on this invention. The preferred embodiment of the base material detection tool according to the present invention is shown, and is a horizontal cross-sectional view of the base material detection work state by the detection needle as seen from above. The preferred embodiment of the base material detection tool according to the present invention is a view of the base material detection work state by the detection needle as seen from above. The preferred embodiment of the base material detection tool according to the present invention is shown, and is a view of the base material detection work state using a magnet as viewed from above.

  Hereinafter, a preferred embodiment of a base material detector according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 2 and 3, the base material detector of this embodiment includes an outer case 1, and a synthetic resin cap 2 detachably coupled to the head 1 a of the outer case 1, A detection needle 3 fixed to the outer case 1, a cylindrical needle case 4 that can be inserted into the inner periphery of the outer case 1 in a longitudinally reciprocable manner and can be prevented from coming off and cover the detection needle 3; The needle case 4 is housed in a loosely fitted state in the inner space of the cap 2 and a coil spring 5 that constantly urges the needle 3 in the direction in which the detection needle 3 is relatively immersed by pushing it out from the inner periphery of the tip of the outer case 1. The magnet 6 is provided. The coil spring 5 corresponds to the spring described in claim 1.

  The outer case 1 is formed with a clip 11 capable of elastically sandwiching a cloth such as a clothing pocket or a tool bag. As shown in FIG. 1 and the like, a convex portion 11a is formed in the vicinity of the tip of the clip 11 so as to be close to and opposed to the outer peripheral surface of the outer case 1, and the outer peripheral surface of the outer case 1 is opposed to the convex portion 11a. A convex portion 11b protrudes from the position of the clip 11 in the longitudinal direction of the clip 11, and the two convex portions 11a and 11b are used to bend a cloth such as a pocket of clothes or a tool bag into an S shape. Can be bitten firmly.

  As shown in FIG. 3, a pair of guide grooves 12 extending in the longitudinal direction (a direction parallel to the central axis) are formed on the inner peripheral surface of the outer case 1 at 180 ° symmetrical positions. A locking groove 13 extending in the circumferential direction from the vicinity of the end 12a on the head 1a side of the outer case 1 is formed, and the insertion portion 2a of the cap 2 on the inner periphery of the head 1a of the outer case 1 The cap 2 is coupled to the head 1 a of the outer case 1 by the pair of locked protrusions 2 b formed at 180 ° symmetrical positions being locked to the locking grooves 13 through the guide grooves 12. It has become so.

  The detection needle 3 is made of stainless steel, has a sharp point 3a, and is sufficiently longer than the thickness of the thickest interior wall among at least various interior walls. It is coated with a fluororesin that has a low friction coefficient. This detection needle 3 is inserted into a central hole 31a of a synthetic resin holder 31, and a head 3b bent in an L shape is a synthetic resin hollow rod-like shape that is detachably fitted to the holder 31. The retainer 32 is sandwiched between the fitting end portion 32a and the flange-shaped step portion 31b (see FIG. 3) of the holder 31, and the head portion 32b of the retainer 32 is formed on the inner periphery of the cylindrical insertion portion 2a of the cap 2. It has come to be supported. That is, the detection needle 3 is detachably fixed to the outer case 1 through the holder 31, the retainer 32 and the cap 2.

  A large number of non-rotating grooves 31c extending in the radial direction are radially formed on the inner surface of the bowl-shaped step portion 31b of the holder 31 at an equal angle, and the L-shaped head portion 3b of the detection needle 3 It fits in one of the non-rotating grooves 31c in the housed state. Further, the depth of the rotation stop groove 31 c is substantially the same as the thickness of the head 3 b of the detection needle 3.

  The needle case 4 is made of a synthetic resin and is formed in a cylindrical shape capable of accommodating the detection needle 3, the holder 31, the retainer 32, and the coil spring 5, and the detection needle 3 is inserted into the tip portion 4a so as to protrude and retract. A small hole 41 is opened. Further, on the outer peripheral surface of the needle case 4, as shown in FIG. 1, the protruding length of the detection needle 3 when the needle case 4 is moved into the outer case 1 against the urging force of the coil spring 5. In other words, a scale 42 for measuring the insertion length of the detection needle 3 into a building material to be described later is displayed. For this reason, the scale 42 is provided in increments of 1 mm, for example, with the position of the distal end edge 1b of the outer case 1 when the pointed portion 3a of the detection needle 3 is at the same position as the distal end surface of the needle case 4 being “0”. Yes.

  The coil spring 5 is made of a metal such as stainless steel, and is disposed on the outer periphery of the detection needle 3, the rear end is fitted and held in the holder 31, and the inner end face 4 c of the front end portion 4 a in the needle case 4. The needle case 4 is housed in the needle case 4 in a state of being appropriately compressed between the outer case 1 and the direction in which the needle case 4 protrudes from the inner periphery of the front end of the outer case 1 by the compression reaction force, in other words. The detection needle 3 is always urged in a direction in which the detection needle 3 enters the needle case 4.

  On the outer peripheral surface of the needle case 4 on the head 4b side, a pair of stoppers 43 project from the 180 ° symmetrical position. On the other hand, on the inner peripheral surface of the outer case 1 into which the needle case 4 is inserted, there is a direction in which the needle case 4 is immersed in the inner periphery of the outer case 1 against the urging force of the coil spring 5, that is, the detection needle 3. The stepped surface 14 that restricts the relative movement of the needle case 4 through the small hole 41 at the tip of the needle case 4 and exposed to the outside by the abutment with the stopper 43 and the biasing force of the coil spring 5 With the movement of the needle case 4 in the direction protruding from the inner periphery of the tip of the case 1, that is, the movement of the needle case 4 in the direction in which the detection needle 3 is inserted into the needle case 4, the stopper 43 is moved away from the stepped surface 14. A cam surface 15 for guiding the needle case 4 to a position opposed to the longitudinal direction is located at the tip of each guide groove 12 described above, and is formed with a predetermined inclination angle with respect to the longitudinal direction. Since the step surface 14 extends in the circumferential direction of the outer case 1, the stopper 43 and the step surface 14 when the outer case 1 and the needle case 4 are relatively displaced in the longitudinal direction against the urging force of the coil spring 5. This collision can be released by relatively rotating the outer case 1 and the needle case 4 by an appropriate angle.

  Further, the stopper 43 engages with the cam surface 15 to move the needle case 4 in the direction of withdrawal from the outer case 1 by the biasing force of the coil spring 5, and the detection needle 3 enters the needle case 4. It functions also as a retaining means for restricting to a predetermined position.

  In the base material detector of the embodiment configured as described above, the needle case 4 is stroked from the outer case 1 by the urging force of the coil spring 5, as shown in FIG. 1 and FIG. In a state where the detection needle 3 protrudes to the limit position and is completely immersed in the needle case 4, the stopper 43 provided on the outer peripheral surface of the needle case 4 is moved by the cam surface 15 provided on the inner peripheral surface of the outer case 1. Since the stepped surface 14 and the needle case 4 are in a position opposite to each other in the longitudinal direction, as shown in FIG. 4, when the tip of the needle case 4 is inadvertently pushed with a finger, the stopper 43 is provided with the stepped surface 14. The needle case 4 is locked, that is, the movement of the needle case 4 in the direction in which the detection needle 3 is exposed is restricted. For this reason, it is possible to effectively prevent a risk that the finger is injured by the detection needle 3.

  And when performing the operation | work which confirms the presence or absence of base materials, such as a wall column, using this base material detection tool, the outer case 1 is grasped by hand and the front-end | tip of the needle case 4 is shown in the gypsum board shown in FIG. The outer case 1 is pushed toward the interior wall 100 by bringing it into contact with an arbitrary position on the surface (wall covering 101 such as wallpaper or cloth). Then, as described above, the stopper 43 provided on the outer peripheral surface of the needle case 4 abuts on the stepped surface 14 provided on the inner peripheral surface of the outer case 1, so that the outer case 1 and the needle case 4 rotate relative to each other. By doing so, the outer case 1 is pushed while releasing the contact between the stopper 43 and the stepped surface 14.

  In this way, since the needle case 4 is not locked, a pressing load on the outer case 1 is applied to the detection needle 3 through the cap 2, the retainer 32 and the holder 31, and the pointed end 3 a is formed in the needle case 4. Since the needle case 4 protrudes from the small hole 41 at the tip of the needle wall 4 and is inserted into the interior wall 100, and the needle case 4 is stopped with the tip end of the needle case 4 in contact with the surface of the interior wall 100, the coil spring 5 is relatively immersed in the outer case 1 while being compressed. At this time, the stopper 43 relatively moves in the guide groove 12 formed on the inner peripheral surface of the outer case 1 with the immersion operation of the needle case 4 into the outer case 1.

  At this time, since the depth of the rotation-preventing groove 31c formed on the inner surface of the bowl-shaped step portion 31b of the holder 31 is substantially the same as the thickness of the head 3b of the detection needle 3, the detection needle 3 is moved to the interior wall 100. The fitting end portion 32a of the retainer 32 receives all of the load of the coil spring 5 that is compressed as it is inserted through the crests (not shown) between the anti-rotation grooves 31c in the flange-shaped step portion 31b of the holder 31. Can be received evenly around the circumference.

  And in the location where base materials, such as a stud and a cross, do not exist in the back side of the interior wall 100, the detection needle 3 penetrates the interior wall 100, and a piercing resistance becomes small, but as shown in FIG. In places where the base material 102 such as a stud is present, when the tip 3a of the detection needle 3 advances to the back surface of the interior wall 100 and hits the base material 102, the piercing resistance increases rapidly, and further piercing occurs. Therefore, the presence or absence of the base material 102 can be confirmed.

  Further, as shown in FIG. 6, the insertion depth of the detection needle 3 is determined by reading the scale 42 displayed on the outer peripheral surface of the needle case 4 at the position of the tip edge 1 b of the outer case 1. The thickness t can be measured. Therefore, it can also be used as a means for measuring the thickness of the interior wall 100.

  After completion of the work, when the detection needle 3 is pulled out of the interior wall 100 by, for example, pulling the outer case 1 by hand, the needle case 4 protrudes from the outer case 1 by the urging force of the coil spring 5, and the detection needle 3 is moved. Displacement in the covering direction. Along with the operation of the needle case 4, the stopper 43 that moves in the guide groove 12 on the inner periphery of the outer case 1 is opposed to the step surface 14 by the cam surface 15 from the tip of the guide groove 12 (see FIG. 2). (The position shown) is automatically locked.

  Therefore, it is not possible to forget to lock the needle case 4 after the work is finished, and it is possible to surely avoid the risk that the needle case 4 is pushed and injured. In addition, since it is not necessary to perform an operation for locking the needle case 4 after the work is completed, the complexity of the work is reduced.

  Further, when pulling out the detection needle 3 from the interior wall 100 by, for example, pulling the outer case 1 by hand, if the outer case 1 is pulled while being rotated appropriately, the L-shaped head 3b of the detection needle 3 can be removed. Since the rotational force of the outer case 1 is transmitted to the detection needle 3 through the needle case 4, the coil spring 5 and the holder 31 by being engaged with the rotation preventing groove 31 c of the holder 31, the interior wall 100 is easily provided. Can be pulled out from.

  Since the outer case 1 is provided with a clip 11 capable of elastically sandwiching a cloth such as a pocket of clothes or a tool bag, the portability is improved and it is difficult to fall off during work. Moreover, since the clip 11 is formed, it becomes difficult to roll, and the outer case 1 and the outer case 1 are used to release the contact between the stopper 43 and the step surface 14 when the detection needle 3 is inserted into the interior wall 100 as shown in FIG. The operation of relatively rotating the needle case 4 can also be easily performed.

  In addition, as shown in FIG. 7, when the base material 103 on the back of the wall is made of mold steel or the like, it is used that the magnet 6 accommodated in the cap 2 generates a magnetic attractive force with respect to the base material 103. Then, the presence or absence of the base material 103 can be confirmed without inserting the detection needle 3 into the interior wall 100.

  When the detection needle 3 is bent, the cap 2 is rotated relative to the outer case 1 so that the engagement protrusion 2b of the cap 2 and the engagement groove 13 of the outer case 1 are engaged with each other. When the cap 2 is removed from the head 1a of the outer case 1 by releasing the stop state, it can be easily disassembled as shown in FIG. 3, so that the detection needle 3 can be replaced with a new one. Then, the spare detection needle 3 for that purpose can be stored in the hollow portion 32 c of the retainer 32.

  In contrast to the illustrated example, the guide groove 12, the step surface 14 and the cam surface 15 can be formed on the outer peripheral surface of the needle case 4, and the stopper 43 can be formed on the inner peripheral surface of the outer case 1. .

1 Outer case 11 Clip 12 Guide groove 13 Locking groove 14 Step surface 15 Cam surface 2 Cap 3 Detecting needle 4 Needle case 43 Stopper 5 Coil spring (spring)
6 Magnet

Claims (4)

  A cylindrical outer case, a detection needle fixed to the outer case, a cylindrical needle case provided in the outer case so as to be movable in the longitudinal direction on the outer periphery of the detection needle, and the needle case, A spring that constantly urges the detection needle in a direction in which it is immersed; a stopper is provided on one of the inner peripheral surface of the outer case and the outer peripheral surface of the needle case; A step surface that restricts relative movement of the needle case in the direction in which the detection needle is exposed by the collision with the stopper, and the collision of the stopper is released by the relative rotation of the outer case and the needle case; and the detection A base material detector comprising: a cam that allows relative movement of the needle case in a direction in which the needle is immersed and guides the stopper to a position facing the stepped surface in the longitudinal direction.   The base material detector according to claim 1, wherein a clip is provided outside the outer case.   The head of the detection needle is loosely inserted into the needle case and holds a spring, a retainer that is detachably fitted to the holder, and a cap that is detachably coupled to the head of the outer case. The base material detector according to claim 1, wherein the base material detector is fixed to the outer case.   The head of the detection needle is bent in an L shape, and the head is fitted with any one of a number of radially extending detent grooves formed in the holder. Base material detector.

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