Strength testing machine

Abstract

To provide a strength testing machine which is suitably configured for testing the strength related to an article strap attachment portion or the strap itself by applying drop impact testing.SOLUTION: A strength testing machine includes: a holding part 210 for vertically suspending and holding a strap 2 attached to a strap hole 11 of a portable device 1; a slider 320 moving between an upper position UP and a lower position LP of a movement locus L, on the movement locus L in an inclination direction inclined relative to the vertical direction; a locking piece 330 supported by the slider 320, and displaced between a first position of allowing abutment against the strap 2 suspended from the holding part 210 and a second position not allowing abutment; and a controller 250 causing the slider 320 to move so that the locking piece 330 is displaced. The controller 250 releases the strap 2 suspended and hooked to the locking piece 330 during movement to the upper position UP of the slider 320, at the upper position UP of the slider 320, and causes the portable device 1 to fall freely.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a strength testing machine. [Background technology]

[0002] Strength tests of test objects are conducted in various fields. Patent Document 1 discloses a drop test machine that drops a test object while holding it in any posture. Strength test machines, such as this drop test machine, require a configuration that corresponds to the content of the test to be performed on the test object. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-65677 A Summary of the Invention [Problem to be solved by the invention]

[0004] A portion of an article to which a strap is attached is subjected to a pulling force from the attached strap. Straps come in a wide variety of types, such as hand straps, shoulder straps, neck straps, and the like. Articles to which straps are attached include, for example, mobile phones and portable walkie-talkies to which hand straps are attached, shoulder bags to which shoulder straps are attached, and musical instruments to which shoulder straps or neck straps are attached. In the case of a testing machine that tests a drop impact force that simulates a pulling force applied to the strap attachment portion of these articles or the strap itself, a configuration for testing the strength of the strap attachment portion or the strap itself is required.

[0005] An object of the present invention is to provide a strength tester having a configuration suitable for testing the strength of a strap attachment portion of an article or the strap itself by a drop impact test. [Means for solving the problem]

[0006] In order to achieve the above object, a strength testing machine according to one aspect of the present invention comprises: a holding section that holds the strap attached to the mounting section of the test object in a vertical direction; a slider that moves on a trajectory in an inclined direction with respect to a vertical direction between an upper position and a lower position of the trajectory; a locking piece supported by the slider and displaceable between a first position where the locking piece can come into contact with the strap suspended from the holding portion and a second position where the locking piece cannot come into contact with the strap suspended from the holding portion; a control unit that moves the slider from the lower position to the upper position, and during the movement of the slider from the lower position to the upper position, hooks and lifts the strap suspended from the holding unit by the locking piece displaced to the first position, and at the upper position of the slider, displaces the locking piece from the first position to the second position to release the strap that has been hooked and lifted by the locking piece at the first position; Equipped with. Effect of the Invention

[0007] According to the present invention, it is possible to provide a strength tester having a configuration suitable for evaluating the strength of a strap attachment portion of an article or the strength of the strap itself by a drop impact test. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing an outline of the configuration of a strength tester according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram illustrating an example of the mobile device of FIG. [Diagram 3] FIG. 3 is an enlarged view of a strap hole portion of the portable device of FIG. [Figure 4] FIG. 4 is an enlarged view of the detection unit of FIG. [Diagram 5]5(a) to 5(c) are diagrams showing the states of each process from lifting the portable device by the strength tester of FIG. 1 until it falls freely. [Figure 6] FIG. 6 is a diagram showing an example of a state of the detection piece when the strap is being hoisted by the locking piece in FIG. [Figure 7] FIG. 7 is a diagram showing the force applied to the detection piece due to the tension of the strap during lifting by the locking piece in FIG. [Figure 8] FIG. 8 is a diagram showing another example of the state of the detection piece while the strap is being hoisted by the locking piece in FIG. [Figure 9] FIG. 9 is a diagram showing the state of the detection piece when the strap from which the portable device has fallen is being lifted up. [Figure 10] FIG. 10 is a flow chart showing an example of a procedure for a strength test using the strength tester of FIG. [Figure 11] FIG. 11 is a flowchart showing another example of the procedure of the strength test using the strength tester of FIG. [Figure 12] FIG. 12 is a diagram showing an example of a state of the locking piece in the process of returning the slider in FIG. 1 to the lower position. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The same or equivalent parts or components are designated by the same reference numerals throughout the drawings.

[0010] The following embodiments are examples of devices and the like for embodying the technical idea of ​​the present invention. The technical idea of ​​the present invention does not limit the materials, shapes, structures, arrangements, etc. of each component part to those described below.

[0011] 1 is a device for testing the strength of a portable device 1 as a test object and a strap 2 attached to the portable device 1. The portable device 1 is, for example, a portable wireless device, a smartphone, etc., and the strap 2 is, for example, a circular neck strap. The strap 2 can be hung around the neck, etc.

[0012] As shown in Fig. 2, the portable device 1 has a strap hole 11 as an attachment portion. A loop-shaped attachment string 21, also called a pine-needle string, is provided at the end of the strap 2. The strap 2 shown in Fig. 2 can be attached to the strap hole 11 by passing the strap 2 shown in Fig. 2 through the loop of the attachment string 21 which is passed through the strap hole 11 as shown in Fig. 3.

[0013] As shown in FIG. 1, the strength tester 100 has a detection unit 200, a moving unit 300, and a vibration suppression member 400. As shown in FIG. 4, the detection unit 200 has a holding unit 210. The holding unit 210 may be any unit capable of holding the strap 2 by suspending it vertically. The holding unit 210 may be configured as a hanging hook, a rod, or the like. For example, when the holding unit 210 is configured as a rod, the holding unit 210 can be attached to or detached from the housing 220 of the detection unit 200 by inserting or removing the holding unit 210 into or from the housing 220. By attaching the holding unit 210, which is passed through the loop of the strap 2, to the housing 220, the holding unit 210 can hold the strap 2 by suspending it vertically in the housing 220 as shown in FIG. 1. The holding unit 210 is disposed at a height such that the portable device 1 suspended vertically from the holding unit 210 by the strap 2 held by the holding unit 210 does not come into contact with a floor surface (not shown).

[0014] The detection unit 200 further includes a detection piece 230, a detection section 240, and a controller 250. The detection piece 230 is supported by a guide section 260 of the housing 220 so as to be movable up and down along the vertical direction relative to the housing 220. The detection piece 230 supported by the guide section 260 is usually located at the lower end of the lifting range due to its own weight. A lower portion 231 of the detection piece 230 located at the lower end of the lifting range is exposed downward from the lower end of the housing 220 in the vertical direction. The detection section 240 is attached to a position above the guide section 260 of the housing 220 in the vertical direction. The detection section 240 detects the detection piece 230 supported by the guide section 260 at the upper end of the lifting range. The detection section 240 does not detect the detection piece 230 supported by the guide section 260 at a position other than the upper end of the lifting range. For example, a non-contact sensor such as a proximity sensor or a distance sensor may be used for the detection section 240. When a distance sensor is used for the detection unit 240, for example, the distance to the detection piece 230 in the lifting / lowering direction is measured by the distance sensor. The detection unit 240 detects that the distance measured by the distance sensor is equal to or shorter than a predetermined distance corresponding to when the detection piece 230 is located at the upper end of the lifting / lowering range. The detection unit 240 may use a contact sensor such as a microswitch that comes into contact with the detection piece 230 at the upper end of the lifting / lowering range.

[0015] The controller 250 has, for example, a general-purpose microcontroller. The microcontroller includes a CPU (Central Processing Unit) and a memory. The memory includes a ROM (Read Only Memory) and a RAM (Random Access Memory). The microcontroller can virtually construct multiple information processing circuits by, for example, executing a program stored in the memory with the CPU. The multiple information processing circuits can, for example, constitute a control unit that controls the operation of each part of the mobile unit 300. The contents of the control performed by the control unit constructed in the controller 250 will be described later.

[0016] Of course, the multiple information processing circuits built in the microcontroller can be configured by dedicated hardware for executing each information processing of the controller 250. Also, the multiple information processing circuits may be configured by individual hardware. The dedicated hardware includes devices such as an application specific integrated circuit (ASIC) or conventional circuit components arranged to execute the functions of the controller 250.

[0017] The moving unit 300 has a guide rail 310, a slider 320, and a locking piece 330. The guide rail 310 extends in an inclined direction inclined with respect to the vertical direction. The slider 320 is supported by the guide rail 310 so as to be slidable in the inclined direction. The guide rail 310 defines a moving range of the slider 320 in the inclined direction. The slider 320 can move between an upper position UP of the moving locus L shown by the imaginary line in FIG. 1 and a lower position LP shown by the solid line, with the moving range defined by the guide rail 310 being a moving locus L in the inclined direction. The moving locus L of the slider 320 and the strap 2 intersect when viewed from a direction perpendicular to both the moving locus L and the strap 2. The direction perpendicular to both the moving locus L and the strap 2 is the front-to-back direction of the paper in FIG. 1. When the strap 2 is swinging around the holding part 210 as viewed from the same direction, the position of the intersection point P where the movement trajectory L of the slider 320 and the strap 2 intersect moves on the movement trajectory L. When the strap 2 is not swinging when viewed from the direction perpendicular to both the movement trajectory L and the strap 2, the position of the intersection point P is a point C where the vertical line V passing through the holding part 210 and the movement trajectory L intersect when viewed from the direction perpendicular to both the movement trajectory L and the strap 2. The portable device 1 suspended from the holding part 210 by the strap 2 is disposed further below the slider 320 at the lower position LP. The slider 320 can be moved using a known configuration such as a motor and a belt pulley mechanism.

[0018] In the example of the moving unit 300 shown in FIG. 1, the slider 320 is supported by a single linear guide rail 310 extending in the inclined direction so as to be slidable in the inclined direction. Although not shown, the moving unit 300 may be configured to support the slider 320 slidably by, for example, an XZ table mechanism combining a horizontal X-axis rail and a vertical Z-axis rail. The XZ table mechanism can slide the slider 320 in an inclined direction that is a combination of the vertical and horizontal directions. The moving unit 300 may be configured so that there is a section in which the slider 320 slides in at least one of the horizontal and vertical directions, as long as there is no problem in engaging and disengaging the engaging piece 330 with the strap 2 for performing a strength test described later.

[0019] The locking piece 330 can be configured, for example, by a rod that protrudes from and retracts from the slider 320. The locking piece 330 configured by a rod protrudes and retracts at least in the horizontal direction relative to the slider 320 so that the locking piece 330 approaches and moves away from the strap 2 suspended from the holding part 210. The locking piece 330 is disposed at a first position when protruding from the slider 320, and is disposed at a second position when retracted into the slider 320. The locking piece 330 configured by a rod can be moved at least in the horizontal direction between the first position and the second position, for example, by using a known actuator such as a solenoid. The locking piece 330 configured by a rod may be configured, for example, to swing around one end of the rod so that the tip side of the rod protrudes and retracts from the slider 320. The moving direction of the locking piece 330 configured by a rod is not limited to the horizontal direction.

[0020] The locking piece 330 may be configured by a locking member such as a hook. The locking piece 330 configured by the locking member may be configured such that at least a part of the locking member moves between a first position and a second position. In this configuration, when at least a part of the locking member is in the first position, the locking member is in a bent hooked state. The locking piece 330 in the hooked state can abut against the strap 2 from the horizontal direction, and the strap 2 can be hung by being hooked. When at least a part of the locking member is in the second position, the locking member is in a released state in which the locking member extends straight. The locking piece 330 in the released state cannot abut against the strap 2 from the horizontal direction, and the strap 2 cannot be hung by being hooked. The direction in which the locking member moves between the first position and the second position may be the horizontal direction or a direction other than the horizontal direction.

[0021] When the slider 320 is at the lower position LP of the movement trajectory L, the locking piece 330 is disposed on the right side of the vertical line passing through the holding part 210 in the figure. When the slider 320 is at the upper position UP of the movement trajectory L, the locking piece 330 is disposed on the left side of the vertical line V passing through the holding part 210 in the figure. When the locking piece 330 is at the first position protruding from the slider 320, it abuts against the strap 2 suspended from the holding part 210 when the slider 320 moves between the upper position UP and the lower position LP. When the locking piece 330 is at the second position retracted into the slider 320, it does not abut against the strap 2 suspended from the holding part 210 even when the slider 320 moves between the upper position UP and the lower position LP.

[0022] When the locking piece 330 is in the first position, as the slider 320 from the lower position LP moves towards the upper position UP, the locking piece 330 comes into contact with the strap 2 of the portable device 1 suspended from the holder 210 around the time the slider 320 passes through the intersection P. When the slider 320 subsequently moves further towards the upper position UP, the locking piece 330 hooks the strap 2 with which it has come into contact and pulls it towards the upper position UP along the movement trajectory L, thereby suspending the portable device 1.

[0023] When the locking piece 330 is in the first position, when the slider 320 in the upper position UP moves toward the lower position LP, the locking piece 330 comes into contact with the strap 2 of the portable device 1 suspended from the holding part 210 around the time when the slider 320 passes through the intersection point P. When the strap 2 is swinging, the position of the intersection point P moves on the movement trajectory L in accordance with the swing angle of the strap 2. When the strap 2 is not swinging, the intersection point P is at a position on the movement trajectory L closest to the lower position LP. After the locking piece 330 comes into contact with the swinging strap 2, when the slider 320 moves further toward the lower position LP, the locking piece 330 gradually restricts the swing angle of the abutted strap 2. When the slider 320 further moves toward the lower position LP and is positioned on the vertical line of the holding part 210, the strap 2 cannot swing due to the abutment of the locking piece 330.

[0024] The vibration suppression member 400 is disposed at a position on the swing trajectory of the portable device 1 when the strap 2, to which the portable device 1 is attached and which is suspended from the holding part 210, swings around the holding part 210, and is attached to the wall surface 410. The vibration suppression member 400 can be made of a sponge such as urethane resin, for example. The vibration suppression member 400 can absorb the impact when the swinging portable device 1 collides, for example, and suppress the swing of the portable device 1 and the strap 2 due to the reaction of the collision.

[0025] The strength tester 100 can perform a strength test of the portable device 1 and the strap 2 as follows. With the strap 2 attached to the portable device 1 suspended from the holder 210, the controller 250 controls the control unit to cause the locking piece 330 to protrude from the slider 320 at the lower position LP and place it at the first position. With the locking piece 330 placed at the first position, the controller 250 controls the control unit to move the slider 320 from the lower position LP toward the upper position UP. Under the control of the controller 250, during the period when the slider 320 is placed between the lower position LP and the intersection point P, the controller 250 controls the control unit to cause the locking piece 330 to protrude from the slider 320 and place it at the first position. When the slider 320 moves to the intersection point P, the locking piece 330 placed at the first position abuts against the strap 2 from the right side of FIG. 1, and the first step shown in FIG. 5(a) is started.

[0026] When the slider 320 moves further toward the upper position UP while the locking piece 330 remains in contact with the strap 2, the locking piece 330 hooks the strap 2 to which the portable device 1 is attached from below and lifts it up, as shown in the second step in FIG. 5(b). When the strap 2 is lifted up by the locking piece 330, the middle part 22 of the strap 2 located between the holding part 210 and the locking piece 330 eventually comes into contact with the lower part 231 of the detection piece 230 located at the lower end of the lifting range, as shown in FIG. 6. While the slider 320 moves from this position to the upper position UP, the middle part 22 of the strap 2 continues to contact the lower part 231 of the detection piece 230. While the middle part 22 of the strap 2 is in contact, the lower part 231 of the detection piece 230 is subjected to a vertical component of the tension generated in the strap 2 by the load of the portable device 1 from the middle part 22 of the strap 2.

[0027] If the gravitational acceleration is g and the mass of the portable device 1 is M, the gravity acting on the portable device 1 is Mg. The vertical component Fv of the tension in the strap 2 is expressed as follows, assuming that the upward vertical direction is positive: Fv = Mg (sinθ1 + sinθ2) (Equation 1) 7, in (Equation 1), θ1 indicates the angle between intermediate portion 22 of strap 2 on the holding portion 210 side of detection piece 230 and the horizontal line H, and θ2 indicates the angle between intermediate portion 22 of strap 2 on the locking piece 330 side of detection piece 230 and the horizontal line H.

[0028] The detection piece 230 that can move in the vertical direction can be considered to be similar to a movable pulley. According to the principle of work using a movable pulley, when the magnitude of the vertical component Fv of the tension applied to the detection piece 230 from the strap 2 exceeds half the gravity mg acting on the detection piece 230 of mass m, the detection piece 230 moves vertically upward from the lower end to the upper end of the lifting range.

[0029] When the slider 320 moves to the upper position UP of the movement trajectory L or a predetermined position before it, as shown in FIG. 8, the detection piece 230, which has moved with the vertical component Fv of the tension of the strap 2, reaches the upper end of the lifting range, or the upward movement amount of the detection piece 230 reaches a predetermined amount. When the detection unit 240 detects the detection piece 230 that has reached the upper end of the lifting range or a position where the upward movement amount becomes a predetermined amount, the control unit of the controller 250 displaces the locking piece 330 from the first position to the second position and releases the lifted strap 2. By releasing the lifted strap 2, the portable device 1 falls freely from the lifted position together with the strap 2, and the third step shown in FIG. 5(c) is reached. When the portable device 1 falls freely, the contact of the strap 2 with the detection piece 2 is released, and the detection piece 230 moves from the upper end to the lower end of the lifting range by its own weight. As the detection piece 230 moves due to its own weight, the detection unit 240 no longer detects the detection piece 230.

[0030] The free fall of the portable device 1 is restricted when the strap 2 is fully stretched. The portable device 1 suspended vertically from the holder 210 by the strap 2 does not come into contact with the floor surface (not shown) even when the strap 2 is fully stretched. When the free fall of the portable device 1 is restricted by the fully stretched strap 2, the portable device 1 does not fall to the floor surface, and a drop impact force is applied to the strap hole 11 of the portable device 1 to which the strap 2 is attached and the strap 2 itself. This drop impact force also simulates the pulling force applied from the strap 2 to the strap hole 11, or the pulling force applied to the strap 2 itself. The strap 2 is lifted by the locking piece 330, and the portable device 1 lifted together with the strap 2 is allowed to fall freely, repeatedly, thereby testing the strength of the strap hole 11 or the strap 2 itself.

[0031] When the strap hole 11 is broken or the strap 2 breaks due to repeated free falls of the portable device 1 described above, the locking piece 330 lifts up the strap 2 from which the portable device 1 has fallen off, as shown in FIG. 9. The strap 2 from which the portable device 1 has fallen off is not subjected to tension due to the weight of the portable device 1. Even if the middle part 22 of the strap 2 abuts against the lower part 231 of the detection piece 230, the strap 2 does not apply a force to the lower part 231 of the detection piece 230 to move the detection piece 230 from the lower end to the upper end of the lifting range. When the portable device 1 has fallen off the strap 2, even if the slider 320 moves to the upper position with the locking piece 330 lifting up the strap 2, the detection piece 230 remains at the lower end of the moving range and the detection unit 240 does not detect the detection piece 230.

[0032] The control unit of the controller 250 checks whether the detection unit 240 detects the detection piece 230 at the upper position UP of the slider 320 when the locking piece 330 is placed at the first position and the slider 320 is moved from the lower position LP to the upper position UP. The control unit can determine whether the portable device 1 is attached to the strap 2 based on the check result of whether the detection unit 240 detects the detection piece 230. When the detection unit 240 detects the detection piece 230, the control unit of the controller 250 continues the strength test assuming that the portable device 1 is suspended. When the detection unit 240 does not detect the detection piece 230, the control unit of the controller 250 ends the strength test assuming that the portable device 1 has fallen off due to damage to the strap hole 11 or rupture of the strap 2. When the strength test ends, the control unit of the controller 250 may notify the user of the strength tester 100 that the detection unit 240 has not detected the detection piece 230.

[0033] The control unit of the controller 250 of this embodiment performs a strength test on the strap hole 11 and the strap 2 while controlling the positions of the slider 320 and the locking piece 330. The strength test can be performed, for example, according to the procedure shown in the flowchart of FIG. 10. The control unit returns the slider 320 and the locking piece 330 to the home position (step S101). By returning to the home position, the slider 320 is placed at the lower position LP, and the locking piece 330 is placed at the second position. The control unit moves the slider 320 from the lower position LP toward the upper position UP, and displaces the locking piece 330 from the second position to the first position (step S103). The locking piece 330 is displaced to the first position during the period when the slider 320 is located between the lower position LP and the intersection point P (see FIG. 1). Either the movement of the slider 320 or the displacement of the locking piece 330 may start first, or both may start simultaneously. When the slider 320 passes through the intersection point P, the locking piece 330 at the first position abuts against the strap 2. The abutting locking piece 330 hooks and lifts up the strap 2 (step S105). The control unit moves the slider 320 to the upper position UP while the locking piece 330 at the first position is lifting up the strap 2 (step S107). The control unit displaces the locking piece 330 from the first position to the second position while the slider 320 is positioned at the upper position UP. When the locking piece 330 displaces to the second position, the hooking of the locking piece 330 on the lifted strap 2 is released, and the portable device 1 lifted up together with the strap 2 falls freely under its own weight (step S109). After displacing the locking piece 330 to the second position, the control unit moves the slider 320 from the upper position UP to the lower position LP (step S111). The displacement of the locking piece 330 to the second position and the movement of the slider 320 to the lower position LP return both to their home positions. One cycle of the strength test is carried out according to the above procedure.

[0034] The procedure described above is one test cycle, and by repeating the test for multiple cycles, the strength of the strap hole 11 or the strap 2 itself can be tested. The control unit of the controller 250 may count the number of times that the detection unit 240 detects the detection piece 230 at the upper end of the movement range when the slider 320 moves to the upper position with the locking piece 330 suspending the strap 2. A numerical value for evaluating the strength of the strap hole 11 or the strap 2 itself can be obtained from the number of counts by the control unit when the detection unit 240 no longer detects the detection piece 230 at the upper end of the movement range.

[0035] When the free fall of the portable device 1 is restricted by the fully stretched strap 2 and a drop impact force is applied to the strap hole 11 of the portable device 1, the horizontal component of the drop impact force causes the portable device 1 and the strap 2 to swing around the holding part 210. While the swing of the portable device 1 and the strap 2 is large, the strap 2 moves toward the wall surface 410 from the movement trajectory L of the slider 320, and a period occurs during which the strap 2 does not intersect with the movement trajectory L. Even if the slider 320, which has been returned to the lower position LP of the movement trajectory L, is moved to the upper position UP during this period, the locking piece 330 arranged at the first position cannot hook and lift the strap 2. If the locking piece 330 does not lift the strap 2, the next cycle of testing cannot be performed. The strength test of the strap hole 11 or the strap 2 itself cannot be performed efficiently unless the test is repeated in short cycles. In order to quickly stop the swinging of the portable device 1 and the strap 2 after a free fall, a strength test of the strap hole 11 and the strap 2 may be performed, for example, by using another example procedure shown in the flowchart of Fig. 11. In the procedure of Fig. 11, the test is carried out in the same manner as the procedure of Fig. 10, from the return of the slider 320 and the locking piece 330 to the home position (step S101) to the free fall of the portable device 1 due to the displacement of the locking piece 330 to the second position (step S109).

[0036] After the lifted portable device 1 is allowed to fall freely, the control unit of the controller 250 moves the slider 320 from the lower position LP toward the upper position UP and displaces the locking piece 330 from the second position to the first position (step S113). The locking piece 330 is displaced to the first position while the slider 320 is located between the upper position UP and the intersection point P (see FIG. 1). Either the movement of the slider 320 or the displacement of the locking piece 330 may start first, or both may start simultaneously. The locking piece 330 at the first position abuts from above against the strap 2 that is swinging to the left of the holding part 210 until the slider 320 moves to the intersection point P, thereby restricting the swinging of the strap 2 (step S115). The greater the swing angle of the strap 2, the closer the point of contact of the locking piece 330 of the strap 2 is to the holding part 210. Even if the slider 320 moves past the intersection point P toward the lower position LP, as shown in FIG. 12, if the locking piece 330 is kept in the first position, the locking piece 330 continues to abut against the strap 2. By moving the slider 320 toward the lower position LP while the locking piece 330 remains in abutment, the strap 2 and the portable device 1 are brought closer to the wall surface 410, and the range in which the strap 2 can swing is gradually restricted to a narrower range. When the portable device 1 attached to the strap 2 collides with the swing suppressing member 400, the swing of the portable device 1 is further suppressed. By the locking piece 330 abutting against the strap 2 while the slider 320 is moving to the lower position LP, the swing of the portable device 1 and the strap 2 caused by a free fall is suppressed in a short time, and the start of the next cycle of testing can be accelerated.

[0037] The next cycle of testing cannot be started until the locking piece 330 in contact with the strap 2 is displaced from the first position to the second position, the locking piece 330 is released from contact with the strap 2, and the locking piece 330 is displaced from the second position to the first position again. As shown in FIG. 11, the control unit displaces the locking piece 330 to the second position after the locking piece 330 comes into contact with the strap 2 (step S119). The locking piece 330 in the first position may be detected by a sensor or the like. Instead of detecting by a sensor or the like, the timing at which the locking piece 330 comes into contact with the strap 2 may be estimated, and in terms of control, it may be considered that the locking piece 330 comes into contact with the strap 2 at the estimated timing. The locking piece 330 may be displaced from the first position to the second position after the slider 320 passes a point C where the movement path L of the slider 320 and the vertical line V passing through the holding part 210 intersect, from an upper position to a lower position of the movement path L, as viewed from the movement direction of the locking piece 330. In order to displace the locking piece 330 to the second position after the slider 320 passes the point C, a procedure (step S117) may be added in which the control unit suspends the displacement of the locking piece 330 to the second position until a predetermined time has elapsed since the locking piece 330 abutted against the strap 2. By adding this procedure, it is possible to more reliably hook and lift the strap 2 with the locking piece 330 in the first position when starting the test of the next cycle. The displacement of the locking piece 330 from the second position to the first position, the movement of the slider 320 to the lower position, and the displacement of the locking piece 330 from the first position to the second position return the strength testing machine 100 to the state shown in FIG. 1, ready for the next cycle of testing to begin.

[0038] The above-described operation is regarded as one test cycle, and multiple test cycles are repeated to test the strength of the strap hole 11 or the strap 2 itself, similarly to the procedure of Fig. 10. Furthermore, after the portable device 1 has free fallen, when the slider 320 in the upper position UP moves to the lower position LP, the locking piece 330 in the first position is brought into contact with the strap 2, so that the swinging of the strap 2 due to the free fall can be quickly stopped and the test for the next cycle can be started quickly.

[0039] The strap 2 may be something other than a hand strap, and the test object to which the strap is attached may be an item other than the portable device 1. The strap may be, for example, a shoulder strap or a neck strap. The test object to which the strap is attached may be, for example, a shoulder bag to which a shoulder strap is attached, or a musical instrument to which a shoulder strap or neck strap is attached. The attachment portion of the test object may be, for example, a part of the test object to which the strap is directly attached by sewing or the like, or a part of the test object to which a ring-shaped metal wire used to connect the strap is attached. This metal wire is also called a ring metal fitting. The ring metal fitting includes various names according to the shape, etc., such as D-rings, snap hooks, and round rings.

[0040] Although the embodiment of the present invention has been described above, the embodiment can be modified or changed based on the above disclosure. All the components of the above embodiment and all the features described in the claims may be individually extracted and combined as long as they are not mutually inconsistent. [Explanation of symbols]

[0041] 1. Portable device (test object) 2 Straps 11 Strap hole (attachment part) 22 Middle section 100 Strength Testing Machine 210 Holding part 230 Detection piece 240 Detector 250 Controller 320 Slider 330 Locking piece C: The point where the slider's moving path intersects with the vertical line passing through the retainer Fv Vertical component of tension L Movement trajectory V Vertical line passing through the holding part

Claims

1. a holding section that holds the strap attached to the mounting section of the test object in a vertical direction; a slider that moves on a trajectory in an inclined direction with respect to a vertical direction between an upper position and a lower position of the trajectory; a locking piece supported by the slider and displaceable between a first position where the locking piece can come into contact with the strap suspended from the holding portion and a second position where the locking piece cannot come into contact with the strap suspended from the holding portion; a control unit that moves the slider from the lower position to the upper position, and, during the movement of the slider from the lower position to the upper position, hooks and lifts the strap suspended from the holding unit by the locking piece displaced to the first position, and at the upper position of the slider, displaces the locking piece from the first position to the second position to release the strap that has been hooked and lifted by the locking piece at the first position; A strength testing machine equipped with

2. 2. The strength testing machine according to claim 1, wherein the control unit displaces the engaging piece from the second position to the first position during a period in which the slider, moving from the upper position to the lower position, is located between a point on the movement trajectory where the slider intersects with the strap when viewed from a direction perpendicular to both the movement trajectory and the strap and the lower position.

3. 2. The strength testing machine according to claim 1, wherein the control unit displaces the engaging piece from the second position to the first position during a period in which the slider, moving from the upper position to the lower position, is located between the upper position and a point on the movement trajectory where the slider intersects with the strap when viewed from a direction perpendicular to both the movement trajectory and the strap.

4. a detection piece that contacts an intermediate portion of the strap located between the holding portion and the locking piece when the slider moves from the lower position to the upper position with the locking piece at the first position in contact with the strap, and that moves vertically due to tension generated in the contacting strap by the load of the test object; a detection unit that detects the detection piece that has moved in a vertical direction due to the tension of the strap at the upper position of the slider, the control unit determines whether the test object is attached to the strap based on whether the detection unit detects the detection piece after the slider is moved from the lower position to the upper position. The strength tester according to any one of claims 1 to 3.

5. The strength tester according to claim 4 , wherein the control unit displaces the locking piece from the first position to the second position when the detection unit detects the detection piece.

Images