KR100923779B1 - Apparatus for measuring weight and bags having the same - Google Patents

Abstract

The present invention relates to a bag whose weight is measured using a load cell, wherein the bag is a load cell physically deformed according to the weight of the bag body, and a bag weight measurement for measuring the weight of the bag body using the deformed load cell. Device.

Load Cell, Strain Gauge, Weight, Weight, Bag, Backpack, Handheld Weigher

Description

Weighing device and bag equipped with the device {APPARATUS FOR MEASURING WEIGHT AND BAGS HAVING THE SAME}

1 is a block diagram illustrating an internal configuration of a bag weighing apparatus according to an embodiment of the present invention.

2 is a view for explaining a load cell according to an embodiment of the present invention.

3 is a view for explaining an embodiment in which the load cell of Figure 2 is mounted on the mounting pedestal of the bag body.

4 is a view for explaining a load cell according to another embodiment of the present invention.

5 is a view for explaining an embodiment in which the load cell of Figure 4 is mounted on the carrying handle of the bag body.

6 is a view for explaining a bag weighing apparatus according to an embodiment of the present invention.

7 is a view for explaining the internal circuit of the bag weighing apparatus according to the present invention.

8 is a view illustrating a Wheatstone bridge that outputs different voltage values according to a change in resistance from a strain gauge according to an exemplary embodiment of the present invention.

9 is a view for explaining various types of bag according to an embodiment of the present invention.

FIG. 10 is a view for explaining a bag weighing apparatus for a bag having a handle in the embodiment of FIG. 9.

FIG. 11 is a view for explaining a coupling device and a strain gauge mounted to the coupling device in FIG. 10.

12 is a view for explaining another bag weighing apparatus for a bag having a handle in the embodiment of FIG.

FIG. 13 is a diagram for explaining a connecting device and a strain gauge mounted to the connecting device in FIG. 12.

FIG. 14 is a view for explaining a bag weight measuring apparatus for a bag having wheels in the embodiment of FIG. 9.

FIG. 15 is a view for explaining a bag weight measuring apparatus for a backpack type bag having a shoulder strap in the embodiment of FIG. 9.

<Explanation of symbols for the main parts of the drawings>

100: bag weighing device

110: bag body

120: load cell

130: display unit

The present invention relates to a device for measuring the weight of a bag, and more particularly to a bag weighing device for displaying the weight of the bag by detecting the deformation of the load cell and the bag equipped with the device.

Bags are used in a variety of applications in a variety of applications. For example, a backpack bag that provides students with a convenient portability, a wheeled bag with wheels for convenient transport of heavy luggage at airports, for long-distance travelers or airplane travelers, There are a myriad of shapes and uses, including briefcases that provide portability with a variety of uses.

In recent years, it is often necessary to weigh these bags. For example, in the case of a backpack for a growing student, the student's backbone must not exceed the appropriate weight so as not to be deformed by the bag. In this case, the student or the guardian of the student must frequently weigh the bag and remove unnecessary contents or provide other forms of transportation.

In addition, in the case of the plane traveler, it is necessary to consider the weight of the bag that can be carried in the cabin per person. To this end, there is a problem in that the burden of finding the scale in the crowded airport to directly measure the weight of the bag. In addition, when the bag cannot be brought in, there is a problem in that it is necessary to store the bag in the cargo compartment and waste time waiting for the bag after the arrival of the destination, or pay attention to the damage of the contents.

In addition, even in the case of a briefcase that provides mobility through the handle may be a burden on the user's body due to the heavy weight exceeding a predetermined reference weight.

Therefore, there is an urgent need for a technical idea that the weight of a bag can be conveniently and quickly measured without limitation of time and space.

The present invention has been made to solve the problems of the prior art as described above, an object of the present invention to provide a bag for measuring the weight of the bag body using a load cell that is deformed according to the weight of the bag.

An object of the present invention is to measure the weight of a bag with a small current consumption by measuring the weight of the bag using a load cell with a bridge resistance of 1000 ohms or more.

Another object of the present invention is to enable the weight of a heavy bag to be measured using a load cell having a safety factor of 5 or more.

Still another object of the present invention is to detect the physical deformation of the predetermined connection device by using a strain gage installed in the predetermined connection device that is applied by the bag, the bag weight measuring device to enable to quickly and accurately know the weight of the bag and It is an object to provide a bag equipped with the device.

In order to achieve the above object and solve the problems of the prior art, the bag according to the present invention, the load cell physically deformed according to the weight of the bag body, and the weight of the bag body using the modified load cell It characterized in that it comprises a bag weighing apparatus for measuring.

A bag weighing apparatus according to the present invention includes a connecting device that receives a weight from the bag, a strain gauge that provides a resistance change from physical deformation of a predetermined material in the connecting device, and a response of the bag in response to a change in resistance from the strain gauge. And a signal processor to generate a digital value corresponding to the weight, and an output unit to display a corresponding weight according to the digital value output from the signal processor.

The signal processing unit according to an embodiment of the present invention, a Wheatstone bridge for outputting an analog voltage value according to the resistance change of the strain gauge, an amplifier for amplifying the analog voltage value from the Wheatstone bridge, the amplified An A / D converter for converting an analog voltage value into the digital value, and a logic circuit for generating a signal for driving the output unit according to the digital value.

The connecting device according to an embodiment of the present invention, the base plate, the movable plate which is disposed concentrically spaced apart inside the base plate, and the movable plate to be elastically flowable with respect to the base plate It further comprises a connecting portion connecting the movable plate and the base plate, wherein the strain gauge is attached to one surface of the movable plate or the connecting portion.

The bag according to an embodiment of the present invention changes the weight according to the physical deformation of the strain gage in the bag body having a certain space for putting the bag, and the connecting device connected to the bag body and weighed by the bag body And a bag weighing device for detecting and indicating a corresponding weight value, wherein the bag weighing device is coupled to a predetermined position of the bag.

The apparatus for weighing a bag according to an embodiment of the present invention detects a change in weight according to the physical deformation and displays the corresponding weight value on a predetermined display device.

The connecting device according to another embodiment of the present invention includes a connection ring connected between the hinge and the handle and having at least one strain gauge installed at a predetermined position, and when the handle is lifted up, the connection ring is received. According to the physical deformation of the linkage by force, the at least one strain gauge detects the change in weight.

The connection device according to another embodiment of the present invention, one side is coupled to the first support fixed to the bag body, the other side is bound to the second support fixed to the handle, at least one installed in a predetermined position A bar having a strain gauge, wherein when lifting the handle, the at least one strain gauge is adapted to the physical deformation of the bar due to the force exerted by both the first and second supports; Detect the change in weight.

The connecting device according to another embodiment of the present invention is provided between the lower end of the bag body and the wheel, and includes a plate having at least one strain gauge installed in a predetermined position, when the bag is put down, The at least one strain gauge detects the change in weight in accordance with the physical deformation of the plate due to the force received from the rod between the lower end and the wheel.

The connecting device according to another embodiment of the present invention includes a connecting ring connected between the bag body and the shoulder strap and having at least one strain gauge installed at a predetermined position, and when lifting the shoulder strap. The at least one strain gauge detects the change in weight according to the physical deformation of the link due to the force received by the link.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings and the contents described in the accompanying drawings, but the present invention is not limited or limited to the embodiments.

The bag according to the present invention includes a load cell that is physically deformed according to the weight of the bag body, and a bag weight measuring device that measures the weight of the bag body using the deformed load cell. In this case, the load cell may be included in the bag weight measuring device or the bag body. Hereinafter, an embodiment in which the load cell is included in the bag weight measuring device will be described for convenience of description.

1 is a block diagram illustrating an internal configuration of a bag weighing apparatus 100 according to an embodiment of the present invention.

Bag weight measuring apparatus 100 according to an embodiment of the present invention includes a bag body 110 is provided with the object storage space and the load cell 120 physically deformed according to the weight of the bag body (110). In this case, the weight of the bag body 110 refers to a weight including not only the weight of the bag body 110 itself but also items stored in the bag body 110. Accordingly, the load cell 120 is mounted on one side of the bag body 110 to physically deform according to the weight of the bag body 110, and outputs a deformation signal according to the physical deformation.

Accordingly, the bag weighing apparatus 100 measures the weight (weight) of the bag body 110 according to the physical deformation of the load cell 120. For example, the bag weighing apparatus 100 collects deformation signals due to physical deformation due to the weight of the bag body 110, and analyzes the collected deformation signals to measure the weight (weight). To this end, the bag weight measuring apparatus 100 may further include a display unit 130 for displaying the weight information to the numerical value of the measured weight. In addition, the bag weighing apparatus 100 according to an embodiment of the present invention, the amplifier for receiving and amplifying the strain signal from at least one load cell 120, in order to display the weight information quantified by the strain signal, the An A / D converter for digitally converting the analog output from the amplifier, and a central processing unit for processing the A / D converted signal signal to the LCD.

2 is a view for explaining a load cell 200 according to an embodiment of the present invention.

Referring to FIG. 2, the load cell 200 according to an embodiment of the present invention may include a first surface 201 mounted on the bag body 201 and a second surface 202 mounted on a wheel or a mounting bracket. And sensing means 203 that are physically deformed by forces in different directions, for example, in the direction of gravity and in the opposite direction of gravity, acting on the first and second surfaces 201 and 202. It includes. As the sensing means 203 according to the embodiment of the present invention, a strain gauge may be used. A specific embodiment of the bag to which the above-described load cell 200 is applied will be described in detail with reference to FIG. 3.

3 is a view illustrating an exemplary embodiment in which the load cell 200 of FIG. 2 is mounted on a mounting pedestal of the bag body 300.

Referring to FIG. 3, the bag body 300 provides a force in the gravity direction according to the weight. Thus, the force in the direction of gravity is applied to the first surface 201 of the load cell 200 mounted on one side of the bag body 300, the second surface of the load cell 200 mounted on the mounting bracket 301, etc. The force opposite to gravity is applied to 202. In addition, physical deformation is applied to the central portion of the load cell 200 as described in the reference numeral 302 due to the forces in the opposite direction described above. Accordingly, the sensing means 203 detects the physical deformation of the central portion and outputs the corresponding deformation signal, and the bag according to the present invention displays the weight information by digitizing the output deformation signal through the display unit.

A bag according to an embodiment of the present invention may include at least four mounting pedestals, mount independent load cells on each of the mounting pedestals, and measure weight by reflecting deformation signals of the independent load cells.

The load cell according to an embodiment of the present invention can operate with a small current by using a strain gauge having a bridge resistance of 1,000 ohm or more as a bridge. Therefore, it can be suitably used for a portable bag or the like in which power supply is not smooth. In addition, the load cell according to an embodiment of the present invention may be designed with a safety factor of 5 or more. As a result, the bag according to the present invention can be weighed up to 150kg or more.

4 is a view for explaining a load cell according to another embodiment of the present invention.

Referring to FIG. 4, the load cell 400 includes a first surface 401 mounted to the bag body, a second surface 402 mounted to a carrying handle used to carry the room body, and a weight of the bag body. A deformation signal corresponding to the physical deformation of the third surface 403 and the third surface 403 which causes physical deformation due to forces in opposite directions applied to the first surface 401 and the second surface 402. It includes a sensing means 404 for outputting. An embodiment to which the load cell 400 is applied according to an embodiment of the present invention will be described in detail with reference to FIG. 5.

5 is a view for explaining an embodiment in which the load cell 400 of FIG. 4 is mounted on a carrying handle 501 of the bag body.

Referring to FIG. 5, the first surface 401 of the load cell 400 is mounted on the inner side of the bag body 502 to receive a force in the direction of gravity along with the bag body. Thus, the second surface 402 of the load cell is mounted to the carrying handle 501, and receives a force from the user in the opposite direction of gravity. That is, by the force in the direction of gravity and the force in the direction opposite to the gravity, physical deformation is applied to the third surface 403, and the sensing means 404 corresponds to physical deformation applied to the third surface 403. Output the deformation signal. Accordingly, the bag weighing apparatus according to the present invention displays weight information in which the deformation signal is digitized through a display unit. The bag according to the present invention can detect the physical deformation of the load cell 400 on at least two sides of the carrying handle 501, thereby enabling a more accurate weight measurement.

As a result, the user using the bag according to the present invention can measure the weight of the bag body quickly and conveniently by measuring the weight of the bag body according to the load cell that is deformed according to the weight.

6 is a view for explaining the bag weight measuring apparatus 600 according to an embodiment of the present invention.

6 illustrates a bag weighing apparatus 600 that can be attached and detached to a general bag body.

Referring to FIG. 6, the bag weighing apparatus 600 may grasp and fix the bag through the clip 613 of the metal bar 612, and lift the bag using the handle 601. Accordingly, the metal rod 611 which is vertically bound to the metal bar 612 passes through the hole 608 of the body 609 and is mutually concentric with the base plate 603 in the base plate 603. The movable plate 606 may be spaced apart from each other. At this time, the metal rod 611 may be coupled to the metal rod 611 to prevent separation after insertion into the hole 608 located at the center of the movable plate 606.

The movable plate 606 is connected through the connecting portion 604 to be elastically flowable with respect to the base plate 603. The connection part 604 according to an embodiment of the present invention may be implemented as an integrated substrate with the movable plate 606 and the base plate 603, and the movable plate 606, the base plate 603, And a substrate in which the connection part 604 is integrated corresponds to a connection device that is weighted by the bag.

Thus, the base plate 603 is fixed to the hole 602 of the handle 601 and the bolt and nut through the hole 605, and also to the hole 607 of the body 609.

As a result, when the bag weighing apparatus 600 is lifted in the opposite direction of gravity through the handle 601, the base plate 603 and the body 609 are directly forced through the handle 601 to reverse the gravity. While moving in the direction, the clip 613, the metal bar 612, and the metal rod 611 connected to the bag (not shown) pull down the movable plate 606 in the direction of gravity. That is, the base plate 603 and the movable plate 606 move in different directions, which causes the connection part 604 to cause physical deformation. The connecting portion 604 is made of a suitable material so that the connecting portion 604 can bend to some extent when the metal rod 611 is moved up by the weight of the bag to push up the movable plate 606. Alternatively, the substrate itself in which the movable plate 606, the base plate 603, and the connecting portion 604 are integrated may be made of one material.

The physical deformation of the connection part 604 according to the present invention is sensed as a change in resistance through a strain gauge 620 mounted on one surface of the connection part 604. That is, the strain gauge 620 provides a differential resistance value according to the degree of physical deformation occurring in the connection 604. In FIG. 6, the strain gauge 620 is preferably installed on the connection part 604 having a large physical deformation, but is not limited thereto. The strain gauge 620 may also be installed on the movable plate 606.

Accordingly, the bag weighing apparatus 600 outputs a digital value corresponding to the weight of the bag in response to a change in resistance from the strain gauge 620 and an output digital value of the signal processor. It may further include an output unit (not shown) for displaying the corresponding weight according to the weight of the bag.

The bag weighing apparatus 600 according to the embodiment of FIG. 6 may conveniently and quickly measure the weight of a bag without mounting a predetermined sensor on the bag. In addition, the bag weighing apparatus 600 of FIG. 6 may be used as a portable scale for conveniently measuring the weight of various objects as well as the above-described bags, and may be used as a handle for an object without a handle.

7 is a view for explaining the internal circuit 700 of the bag weighing apparatus 600 in the present invention.

As shown in FIG. 7, the internal circuit 700 of the weighing apparatus 600 according to the present invention includes a strain gauge 710, a signal processor 720, and an output unit 730.

The strain gauge 710 is installed in the connection portion 604 or the like of a predetermined connection device as shown in FIG. 6 and provides a resistance change from physical deformation of a predetermined material that is weighted from a bag. The strain gauge 710 is attached to the surface of the structure in order to measure the deformation state and the amount of the structure, and measures the amount of change in the electrical resistance when the structure is subjected to stress (stress) to cause deformation.

FIG. 8 is a diagram illustrating a Wheatstone bridge 800 that outputs a different voltage value V0 according to a change in the resistance Rs of the strain gauge 710 according to an exemplary embodiment of the present invention.

It is assumed that the resistance Rs detected by the strain gauge 710 is installed as shown in FIG. 8. When the resistance 'RS' of the strain gauge 710 is 0, the Wheatstone bridge 800 satisfies 'R1 * R4 = R2 * (R3 + RS)', and the output voltage V0 is zero. If the value of the resistance 'RS' of the strain gauge 710 is changed according to the physical deformation of the portion where the strain gauge 710 is installed, the equilibrium state of the Wheatstone bridge 800 becomes incomplete. Therefore, the voltage value of 'VO' changes. The resistance 'RS' of the strain gauge 710 generates a voltage value in analog form that is differentiated according to the degree of physical deformation, so that the weight may be measured from a voltage value that varies according to the physical deformation.

In FIG. 7, the signal processor 720 outputs a digital value corresponding to the weight of the bag in response to a change in resistance from the strain gauge 710. To this end, the signal processor 720 is a Wheatstone bridge 721 for outputting an analog voltage value in accordance with the resistance change of the strain gauge 710, amplifying the analog voltage value from the Wheatstone bridge 721 An amplifier 722, an A / D converter 723 for converting the amplified analog voltage value to the digital value, and a logic circuit for generating a signal for driving the output unit 730 according to the digital value ( 724).

The output unit 730 displays a corresponding weight according to the digital value output from the signal processor 720. To this end, the output unit 730 may be a display device such as an LCD (Liquid Crystal Dislpay). In addition, the output unit 730 may be any device capable of visually representing a digital value in addition to the LCD, and may include a speaker or the like that can visually express the digital output value. The signal processor 720 and the output unit 730 may be coupled to an appropriate position of the handle of the bag or the bag body in order to allow the user to conveniently check the weight of the bag.

9 is a view for explaining various types of bag according to an embodiment of the present invention.

As shown in FIG. 9, the bag is generally a wheel bag 900 that can be moved through the wheel 901, a travel bag 910 that can be carried through the handle 911, and a hard case bag that can be carried through the handle 921. 920, a briefcase 930 that can be carried through a handle 931 or a shoulder strap (not shown), and a backpack-type backpack 940 that is carried on the back through a plurality of shoulder straps 941. In this way, the bag has a bag body having a certain storage space for storing the bag, and has a convenient means for moving the bag body such as wheels, handles, or shoulder straps. The movement convenience means is a portion that receives a force when the user lifts or puts down the bag body, and by installing the strain gauge 710 in a predetermined connection device in the movement convenience means, it is possible to detect the weight of the bag.

10 is a view for explaining the bag weight measuring apparatus 1000 for the bag (910, 920, 930) having a handle in the embodiment of FIG.

Referring to FIG. 10, the bags 910, 920, and 930 include a bag body (not shown) and the bag weighing apparatus 1000, and the bag weighing apparatus 1000 includes hinges 1004 and 1005. The handle 1003 and the connecting ring 1001. The link ring 1001 is coupled between the hinges 1004 and 1005 and the handle 1003, and at least one strain gauge is installed at a predetermined position of the link ring 1001. That is, the coupling ring 1001 is coupled to the holes of the hinges 1004 and 1005 and the holes 1002 of the handle 1003, so that the handle 1003 and the hinges 1004 and 1005 are structurally connected. As a result, when the user lifts the handle 1003, the force is transmitted in the order of the connecting ring 1001 and the hinges 1004 and 1005, wherein the connecting ring 1001 receives the force in the direction of gravity.

Referring to FIG. 11, when the bag is lifted through the handle 1003, the connection ring 1001 causes physical deformation according to the weight of the bag body, and the connection ring 1001 according to the physical deformation. The strain gauge 1101 attached to) causes a resistance change. That is, when the handle 1003 is lifted, the at least one strain gauge 1101 causes a resistance change according to the physical deformation of the link ring 1001 due to the force received by the link ring 1001. Detect changes in Typical strain gages can measure between 0.1 and 100,000 Nm with a tolerance of around 0.05%. Therefore, a resistance change according to the strain gauge 1101 may occur even in the minute physical deformation of the connection ring 1001. As described with reference to FIG. 7, the corresponding weight of the bag according to the resistance change in the strain gauge 1101 may be displayed through the output unit 730.

If the connection ring 1001 is plural or the strain gauge 1101 is attached to the connection ring 1001, the logic circuit 724 in FIG. 7 may be configured to provide the plurality of strain gauges 1101. The corresponding digital values according to the output voltage (V0) values of the Wheatstone bridge 800 due to the change in resistance may be summed and processed. In this case, in order to reflect all the resistance changes from the plurality of strain gauges 1101, the number of strain gauges may be provided with the Wheatstone bridge 721, the amplifier 722, and the A / D converter 723. have.

12 is a view for explaining another bag weight measuring apparatus 1200 for the bag (910, 920, 930) with a handle in the embodiment of FIG.

12 illustrates a handle structure different from that of FIG. 10, and the bags 910, 920, and 930 include a bag body (not shown) and the bag weight measuring device 1200.

The handle 1201 mounted to the bag is screwed through the holes 1202 and 1204 to the upper metal bar 1203 (first support). The upper metal bar 1203 (first support) is fastened to one side of the intermediate metal bar 1207, which is a connecting device to which the strain gauge 1208 is attached with a fastening device such as a bolt and a nut through the holes 1205 and 1206. In addition, the other side of the intermediate metal bar 1207 is fixed to the lower metal bar 1209 (the second support) through a fastening device such as a bolt and a nut, and the lower metal bar 1209 (the second support) is a hole 1210. It is fixed to the case 1212 by using a screw. The case 1212 includes three metal bars of the upper metal bar 1203 (the first support), the intermediate metal bar 1207, and the lower metal bar 1209 (the second support), and opens the hole 1211. It is fixed to the top of the bag body (not shown) by using. That is, the bag body is lifted in the opposite direction of gravity through the handle 1201, where one side of the intermediate metal bar 1207 is in the direction of gravity and the other is the force in the opposite direction of gravity by the weight of the bag. And the intermediate metal bar 1207 causes physical deformation.

FIG. 13 is a diagram for describing the intermediate metal bar 1207 and the strain gauge 1208 attached to the intermediate metal bar 1207 as a connecting device in FIG. 12.

As shown in FIG. 13, one side and the other side of the intermediate metal bar 1207 are forced in opposite directions to cause physical deformation, which causes a strain gauge 1208 attached to the surface of the intermediate metal bar 1207. Will be detected. As described above, the strain gauge 1208 is changed in resistance according to the physical deformation, and the resistance change is processed through the signal processor 720 and the output unit 730 to display a corresponding weight. That is, the at least one strain gauge 1208 is caused by a force applied to both the upper metal bar 1203 (first support) and the lower metal bar 1209 (second support) when the handle is lifted. The physical deformation of the intermediate metal bar 1207 causes a change in resistance to detect a change in weight for the bag.

FIG. 14 is a view for explaining a bag weight measuring apparatus 1400 for a bag 900 having a wheel 901 in the embodiment of FIG. 9. The bag 900 includes a bag body (not shown) and the bag weight measuring device 1400.

The bag 900 may be moved to another location through one or more wheels 901. At this time, the wheel 901 is fixed to the lower end of the bag body and the metal rod 1413 in the longitudinal direction, the metal rod 1413 passes through the hole 1412 of the lower surface 1411 of the bag body, Force is transmitted to the base plate 1406 fixed to the support 1401 at the bottom of the bag body and the movable plate 1407 connected to the base plate 1406 through a connection 1408.

In order to smoothly move the movable plate 1407, an edge block 1404 may be positioned between the support 1401 and the base plate 1406. In addition, the movable hinge 1409 may be fixed to the lower portion of the movable plate 1407 to precisely transmit the force of the metal rod 1413.

As a result, the force according to the weight generated from the bag body (not shown) is directed in the direction of gravity, and the force in the direction of gravity is moved through the movable plate 1407 through the metal rod 1413 fixed in the longitudinal direction to the wheel 901. Is transmitted in the opposite direction of gravity. As a result, the connecting device 1408 connecting the movable plate 1407 and the base plate 1406 has a force in a direction opposite to gravity generated by the movable plate 1407 and a gravity direction generated by the base plate 1406. By the force of, a physical deformation occurs, and at this time, the strain gauge 1420 generates a resistance change according to the physical deformation. The resistance change from the strain gauge 1420 is output through the signal processor 720 and the output unit 730.

In this case, at least one strain gauge 1420 may be installed on the base plate 1406, the movable plate 1407, and the connecting portion 1408. The strain gauge 1420 is preferably installed on the connection portion 1408 having a large physical deformation, but is not limited thereto. The strain gauge 1420 may also be installed on the movable plate 1407. One substrate in which the base plate 1406, the movable plate 1407, and the connecting portion 1408 are integrated corresponds to a connecting device that is weighed by the bag similarly to FIG. 6. That is, at least one strain gauge 1420 of FIG. 14 may be used to determine the weight of the weight of the bag according to physical deformation of the connection part 1408 due to a force received from the metal rod 1413 when the bag is put down. Detect a change.

In general, the wheels 901 are mounted to the bag 900 in an even form, such as two or four. Therefore, when a plurality of wheels 901 are used in the bag 900, the bag weight measuring apparatus as shown in Figure 14 can be mounted on each wheel 901. In another example, each wheel 901 includes a strain gauge 1420, the Wheatstone bridge 721, an amplifier 722, and an A / D converter 723, and each wheel 901. The digital value generated from the sum may be processed by the logic circuit 724 and output through the output unit 730. To this end, the logic circuit 724 may be a microcontroller with a predetermined firmware burned.

In another example, a bag having a lower end consisting of two wheels and two supporting rods may be considered. In this case, the two wheels may be implemented as in the embodiment of FIG. 14, and the two support rods may be implemented by only the metal rod 1413 excluding the wheel part in the embodiment of FIG. 14.

FIG. 15 is a view for explaining a bag weight measuring apparatus 1500 for a backpack type bag 940 having a shoulder strap 941 in the embodiment of FIG. 9. The backpack type bag 940 includes a bag body (not shown) and the bag weight measuring apparatus 1500.

As shown in FIG. 15, the shoulder strap 1504 of the bag body is connected to the shoulder strap 941 through a connecting ring 1503, which is a connecting device. That is, the coupling ring 1503 is coupled to the shoulder strap 1504 of the bag body and the hole 1502 of the shoulder strap 941, whereby the bag body and the shoulder strap 941 are structurally connected.

Thus, when the bag body is lifted up through the shoulder strap 941, the bag body generates a force in the direction of gravity according to the weight, the opposite direction to the shoulder strap 941 lifted in the opposite direction of gravity Acts as. Thus, the link ring 1503 located between the shoulder strap 941 and the bag body is physically deformed by the force of the shoulder strap 941 and the force of the bag body. This physical deformation changes the resistance of the plurality of strain gauges 1501 attached to the surface of the coupling ring 1503, and the resistance change of the strain gauges 1501 causes the signal processing unit 720 and the output unit 730 to change. Is displayed. In the case of a general backpack type bag 900, two shoulder straps 941 are positioned on the side of the bag, and each of the two shoulder straps 941 has the linkage 1503 and the strain gauge 1501 respectively. Support the body. The resistance change generated from each strain gauge 1501 may be summed by the signal processor 720 and displayed through the output unit 730 as described above.

As described above, the present invention has been described by specific embodiments such as specific components and the like, but the embodiments and the drawings are provided only to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from such description.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and all the things that are equivalent to or equivalent to the claims as well as the following claims will belong to the scope of the present invention. .

According to the present invention, it is possible to provide a bag for measuring the weight of the bag body using a load cell that is deformed according to the weight of the bag.

According to the present invention, by measuring the weight of the bag using a load cell having a bridge resistance of 1000ohm or more, it is possible to measure the bag weight with a small current consumption.

According to the present invention, a load cell with a safety factor of 5 or more can be used to measure the weight of a heavy bag.

In the bag weighing apparatus and bag according to the present invention, it is possible to quickly and accurately display the weight of the bag by detecting the physical deformation of the connecting device under force through the strain gauge.

Claims (14)

delete delete delete delete delete In the weight measuring device, A connecting device that receives the weight from the bag body; A strain gauge that provides a resistance change from physical deformation of a given material in the connection device; A signal processor for generating a digital value corresponding to the weight of the bag in response to a change in resistance from the strain gauge; And An output unit for displaying a corresponding weight according to the digital value output from the signal processor Including, The connecting device, Base plate; A movable plate disposed concentrically spaced apart from the inside of the base plate; And A connecting portion connecting the movable plate and the base plate so that the movable plate can flow elastically with respect to the base plate. Including; And said strain gauge is attached to one surface of said movable plate or said connecting portion. The method of claim 6, The signal processing unit, A Wheatstone bridge outputting an analog voltage value according to a resistance change of the strain gauge; An amplifier for amplifying the analog voltage value from the Wheatstone bridge; An A / D converter converting the amplified analog voltage value into the digital value; And Logic circuit for generating a signal for driving the output unit in accordance with the digital value Bag weighing apparatus comprising a. delete In a bag that measures its own weight, A bag body having a predetermined space for storing luggage; And Bag weight measuring device that is connected to the bag body and detects the change in weight according to the physical deformation of the strain gauge in the connecting device that is weighed by the bag body to inform the corresponding weight value Including, The connecting device, A connection ring connected between the hinge and the handle and having at least one strain gauge installed at a predetermined position, wherein the at least one strain gauge is connected to the at least one strain gauge according to a physical deformation of the connection ring by a force received by the connection ring when lifting the handle. Bag characterized in that one strain gauge detects the change in weight. The method of claim 9, The bag weight measuring device, And detecting the change in weight according to the physical deformation and displaying the corresponding weight value on a predetermined display device. delete In a bag that measures its own weight, A bag body having a predetermined space for storing luggage; And Bag weight measuring device that is connected to the bag body and detects the change in weight according to the physical deformation of the strain gauge in the connecting device that is weighed by the bag body to inform the corresponding weight value Including, The connecting device, One side is engaged with the first support fixed to the bag body, the other is engaged with the second support fixed to the handle, and includes a bar having at least one strain gauge installed at a predetermined position, And said at least one strain gauge detects a change in weight in response to a physical deformation of said bar due to a force applied to both said first and second supports when lifting said handle. In a bag that measures its own weight, A bag body having a predetermined space for storing luggage; And Bag weight measuring device that is connected to the bag body and detects the change in weight according to the physical deformation of the strain gauge in the connecting device that is weighed by the bag body to inform the corresponding weight value Including, The connecting device, A plate installed between the lower end of the bag body and the wheel and having at least one strain gauge installed at a predetermined position, And the at least one strain gauge detects a change in weight when the bag is put down, in response to a physical deformation of the plate due to a force received from a rod between the lower end and the wheel. In a bag that measures its own weight, A bag body having a predetermined space for storing luggage; And Bag weight measuring device that is connected to the bag body and detects the change in weight according to the physical deformation of the strain gauge in the connecting device that is weighed by the bag body to inform the corresponding weight value Including, The connecting device, A connection ring connected between the bag body and the shoulder strap and having at least one strain gauge installed at a predetermined position; And said at least one strain gauge detects a change in weight in response to a physical deformation of said linkage due to a force exerted by said linkage when lifting said shoulder strap.

Images