JP4805095B2 - Electronic scales - Google Patents

Description

The present invention relates to a battery and an electronic balance that accommodates a battery holder, and is used for an upper plate type electronic balance, an electronic balance, a weight scale, a fee scale, a postal scale, a number scale, and the like.

  At present, electronic balances are used in various environments, and battery built-in type electronic balances that can be used even in places where there is no outlet have been commercialized.

  There are various types of scales with a built-in battery. Although the waterproof balance shown in Patent Document 1 has an excellent waterproof function, it has a dedicated waterproof structure and is difficult to adopt for a general-purpose electronic balance.

  In the thin balance shown in Patent Document 2, a plurality of batteries are arranged on both sides of the load cell, battery connection on both sides is complicated, and battery replacement is complicated.

  The battery-driven scale shown in Patent Document 3 has an opening for battery replacement and a battery cover on the bottom surface of the lower case. For battery replacement work, the battery cover must be opened and closed while the entire scale is inverted. Therefore, the replacement work is complicated. In addition, in an electronic scale that does not fix the weighing pan, it is necessary to carefully replace the battery while paying attention to the misalignment of the weighing pan causing the error.

  In the battery-driven scale shown in Patent Document 4, the battery holder is taken in and out from the right side of the scale body, and the battery can be replaced without inverting the entire scale.

JP 2003-322556 A JP 2002-13975 A Japanese Utility Model Publication No. 61-149836 Japanese Utility Model Publication No. 61-145471

  Regardless of the type of this type of measuring instrument, the balance body does not float even if an unbalanced load is applied to the weighing pan, the entire scale is symmetrical in terms of molding, and the center of gravity is low in use and approximately in the center. Has become common sense. In addition, the battery built-in scale is often carried and used, and it is desirable that the entire scale is rigid and easy to hold.

  In this respect, since the battery-driven scale of Patent Document 4 has the battery holder disposed in front of the scale body, the center of gravity of the scale is in front of the scale and lacks stability as a precision instrument. In addition, the battery holder is inserted from the right side, and the main body of the scale is not symmetrical, and there are difficulties in use and molding of the case.

  Many measuring instruments have operation keys, a display unit, an electronic circuit board, and the like concentrated on the front side of the main body, and there is no space for arranging a large number of batteries. Furthermore, the battery built-in scale is often used outdoors or in a humid environment, and it is desired to isolate the battery, but there is no space for it.

The present invention has been made to solve the above-described drawbacks of the battery built-in electronic balance, and one of the problems is that the battery can be replaced quickly and accurately without reversing the scale. Secure space for placing batteries and reduce the frequency of battery replacement, and three to accommodate a large number of batteries, use its weight to increase the stability of the balance body, and four are general 5 is to provide an electronic balance capable of forming a battery storage chamber and preventing intrusion of moisture and the like.

In order to achieve the above object, the present invention comprises a main body of a scale comprising upper and lower cases, a weighing pan disposed on the main body of the scale, and a load cell accommodated in the main body of the balance so as to receive the load of the weighing pan. In the electronic balance having a battery holder housing in the balance body, the load cell is fixed symmetrically on the lower case, the space between the load cells serves as the battery holder housing, and the back of the scale body An opening through which the battery holder passes and a rotating battery cover that is pivotally supported to close the opening are provided. The battery holder is brought into contact with the battery holder in front of the battery holder housing and stopped. An electronic balance in which a conductive member electrically connected to the battery is arranged, wherein the battery holder is arranged in the center of the scale body, and the battery holder housing is an upper and lower case constituting the scale body. Covered The battery holder is vertically extended from the upper and lower cases, and the tips are separated by a partition wall that fits together, and the battery holder inverts the scale body through the opening when the battery cover is open. I was able to take it out without doing.

Further, in the electronic balance of the present invention, the battery holder housing portion is a partition wall that is covered with upper and lower cases constituting the main body of the scale, extends in a vertical direction from the upper and lower cases, and has tips that fit together. Since it is separated, it has a structure in which moisture is difficult to enter. Even if the battery leaks or dust enters the battery holder housing portion through the battery holder, the dust and the like are shielded by the partition wall, so there is no possibility of adversely affecting the electronic circuit, the load cell, and the like.

According to the electronic balance of the present invention, the load detection mechanism is symmetrically arranged on both the left and right side surfaces of the balance body, the battery housing portion is provided between the load detection mechanisms, and the battery is attached and detached from the back surface of the scale body. As a result, the balance body is housed in a well-balanced part, the center of gravity of the balance is kept low in the center, the stability of the scale is increased, and the battery can be easily replaced without reversing the scale.

  Hereinafter, an embodiment of an electronic balance according to the present invention will be described with reference to FIGS. 1 is a perspective view of an electronic balance showing the insertion and removal of the battery holder, FIG. 2 is a perspective view showing the relationship between the weighing pan and the balance body, FIG. 3 is a perspective view showing attachment of various components to the lower case, and FIG. FIG. 5 is an exploded view of FIG. 4, FIG. 6 is a sectional view of the YY line of FIG. 1, FIG. 7 is an exploded view of FIG. 6, and FIG. The perspective view seen from the back side, FIG. 9 is the perspective view which looked at the battery holder from the front side.

  In the figure, an electronic balance 1 is a general-purpose scale that measures the weight from light weight to heavy weight. Mainly, in addition to the operation keys SW and the display D, the weighing pan 2, the lower case 20, and the upper case 50 are used. The balance main body 16, two weighing sensors (load cells) 42 fixed to the lower case 20, a resin battery holder 60 that enters and exits from the back of the balance main body 16, and four horizontal adjustment legs F on the bottom surface of the balance main body 16. is there. The description of the basic configuration that is substantially the same as that of Patent Documents 1 to 4 will be omitted, and the following description will be made sequentially focusing on the differences.

  A weighing pan 2 of an electronic balance 1 shown in FIGS. 1 and 2 includes a square upper plate 3 on which an object to be weighed is mounted and a plate receiver 6 to which the upper plate 3 is attached and detached. Thin molding with resin. The surface of the upper plate 3 is mirror-finished so that it is difficult to get dirty and easy to clean. 2, 4, 5, and 7 are hooks protruding inward from the center of the lower end 4 of the upper plate 3, and the hooks 5 fit into the recesses 7 of the plate receiver 6. 3 is attached to the tray receiver 6.

  As shown in FIGS. 2 and 4 to 7, the dish receiver 6 has ribs 8 standing vertically and horizontally at the top, and mounting legs 9 from the four corners of the lower surface. The mounting leg 9 divides the load of the weighing pan 2 into four parts and transmits the load to a load detection mechanism 35 described later, and a recess 10 for arranging the knob 13 of the fastener 12 is formed thereon. Yes. Reference numeral 11 denotes a through hole formed below the concave portion 10 through which the screw 14 of the fastener 12 is inserted. 4, 5, and 7, 15 is a mounting piece protruding from the lower surface of the mounting leg 9, and the inner surface of the mounting piece comes into contact with the outer periphery of an elastic ring R described later to align the weighing dish 2. Is. Four of the mounting pieces 15 protrude symmetrically at an angle of 45 degrees, and any mounting piece 15 comes into contact with the elastic ring R and is absorbed even if an offset load is applied from any direction. Reference numeral 18 denotes an outer ring formed on the outside of the mounting leg 9, which is disposed outside a flange 54 formed on the upper case 50 described later, and prevents dust from entering the through hole 11. It is.

  The lower case 20 will be described with reference to FIGS. The lower case 20 is made of resin like the weighing pan 2 and is formed to be uniform and thin. Reference numeral 21 denotes an outer wall provided with a step at the tip so as to be fitted to an outer peripheral edge of the upper case 50 described later, and 22 is an inner wall formed along the outer wall 21 in the same manner. The inner and outer walls 21 and 22 not only reinforce the outside of the lower case 20, but the outer wall 21 suppresses intrusion of dust from the outside, the inner wall 22 functions as a bank, and the invading water droplets enter the inner wall 22. To prevent. As shown in the illustrated example, the inner wall 22 is preferably higher than the outer wall 21, but may have the same height as long as it has an appropriate height. Further, it is desirable that various fitting shapes at the tips of the inner and outer walls 21 and 22 are selected depending on the size of the scale body.

  23a is a rib formed on the front side of the lower case 20, and 23b is a rib formed on the rear side from the center, which increases the rigidity at each position. The upper surface of the rib 23b serves as a slide surface when a battery holder 70 described later enters, and also serves as a lower surface side of a battery holder chamber 56 (accommodating portion) for the battery holder 70. A holding plate 26 stands in front of the central rib 23b, and has a rail-like protrusion (not shown because it is the same as the protrusion of the battery holder 70) for holding the conductive member 33 on the back surface. Reference numeral 27 shown in FIGS. 3, 6, and 7 denotes a side wall formed outside the battery holder chamber 56, and constitutes the battery holder chamber 56 together with the partition plate 55 of the upper case 50. The side wall 27 is an extension of the outer wall 21, and the mating surface has a “U” shape.

  As a means for screwing various parts in front of the lower case 20, a projection 28 for the circuit board PB on the right side, a projection 29 for the adjustment leg F on the front, rear, left and right, a projection 30 for the level device H on the left side, an upper case A mounting projection (not shown) or the like is formed. These protrusions 28 to 30 are coupled with the ribs 23a to increase the rigidity in front of the lower case 20. A seal 32 is attached to the upper surfaces of the leg projections 29, the leveling projections 30, and the upper case mounting projections to prevent water from entering the ground.

  As shown in FIG. 3, the conductive member 33 is a coil spring, and has a contact portion 34 that contacts the tip of the battery holder 70 at the tip. Since a connection terminal (not shown) extends from the rear end to the circuit board PB and the like, and this connection terminal is close to the circuit board PB, both connection cables are shortened to suppress power supply noise. be able to.

  Next, the load detection mechanism 35 fixed to the lower case 20 will be described. As shown in FIG. 5, the load detection mechanism 35 includes a load receiving body 36 and a beam-type load cell 42 which are symmetrically arranged on the left and right sides of the lower case 20, and receives the load of the weighing pan 2 to generate an electric signal. It has been converted. The load receiver 36 is a long plate having a semicircular shape at both ends, and is thinned by forming ribs 37 on the lower surface. 3, 38 is a mounting hole for fixing the load receiver 36 on the movable portion 44 of the load cell 42, 39 is formed on the front and back of the upper surface, the projection into which the through-hole 11 of the tray receiver 6 fits, and 40 A concave portion 41 for arranging the elastic ring R formed at the base of the protrusion 39 is a metal female screw embedded in the center of the protrusion 39, and the screw 14 of the fastener 12 is connected to the female screw 41. Are screwed together, and the tray receiver 6 is fixed to the load receiver 36. The load receiver 36 collects loads from the two legs 9, 9 of the tray receiver 6 and transmits them to the load cell 42.

  The elastic ring R is formed of silicon or rubber, and is arranged in the arrangement recess 40 of the load receiver 36 as shown in FIG. The mounting piece 15 of the mounting leg 9 is placed on the upper surface of the mounting leg 9 to absorb the uneven load of the weighing pan 2 and transmit it to the load receiver 36. 4, 5, and 7, the inner peripheral surface of the mounting piece 15 at the lower end of the mounting leg 9 is arranged on the outer peripheral surface of the elastic ring R, and the tray receiver 6 is aligned. .

  As shown in FIGS. 4 and 5, the load cell 42 receives a load from the load receiver 36, and the movable portion 44 moves downward with the fixed portion 43 as a fulcrum. The weighing is performed by adding the measured values of the two load cells 42. Is displayed. For this reason, the load burden of the load cell 42 becomes 1/2 compared with a single load cell, and a smaller and lighter strain generating body can be used. Further, as the size is reduced, the lower weighing range can be expanded, and the space between the load cells 42 and 42 can be widened, so that a large number of batteries can be arranged. Although the weighing sensor of the illustrated example shows a typical load cell, a capacitance type, an electromagnetic balance type, a tuning fork type, or the like may be used according to the weighing or application.

  Reference numeral 45 denotes a resin-made fixing body for fixing the load cell 42 to the lower case 20, and a rib 46 and a mounting hole 47 for fixing its own screw are formed on the upper surface. A load cell fixing plate 48 is screwed onto the fixed body 45, and a fixing portion 43 of the load cell 42 is screwed to the upper surface thereof. Reference numeral 49 denotes a movable part fixed plate for causing the load cell 42 to act as the movable part 44. Both the fixing plates 48 and 49 have a “U” shape on the plane, and the load cell 42 moves up and down in the center.

  The upper case 50 shown in the drawing has an inverted “U” cross section, and a fitting wall 51 (see FIGS. 4 to 5) whose outer peripheral end is fitted to the tip of the outer wall 21 of the lower case 20, the fitting An inverted “V” -shaped handle 52 formed on the outside of the wall 51, an insertion port 53 through which the leg 9 of the tray receiver 6 passes, a flange 54 erected from the edge of the insertion port 53, and the lower case 20 A partition plate 55 and the like which are fitted to the side wall 27 and form the battery holder chamber 56 are integrally molded with resin. The upper case 50 is also formed to be uniform and thin like the weighing pan 2 and the lower case 20. The reason why the thickness is reduced is that the fitting wall 51 and the handle 52 serve as the outer side of the upper case 50, and the four flanges 54 and the partition plate 55 also serve as a reinforcement at the center of the upper case 50. As a result, the entire upper case 50 is reduced in weight.

  1, 57 is an opening for passing the battery holder 70 formed on the back surface of the upper case 50, 58 is an openable battery cover that covers the opening 57, 59 is a closing claw formed on the upper end of the battery cover 58, A square support frame 60 supports the battery cover 58. A screw stopping fixing portion (not shown) for fixing the support frame 60 to the upper case 50 is formed above the support frame 60. Reference numeral 61 denotes an unevenness for positioning in which the unevenness 76 at the rear end of the battery holder 70 is fitted, and restricts the retreat of the battery holder 70 to determine its stop position. The battery cover 58 and the support frame 60 are resin-molded and lightweight.

  The battery holder 70 will be described with reference to FIGS. 6 and 8 to 9. 6 is a cross-sectional view of the electronic balance 1 containing the battery holder 70, FIG. 8 is a perspective view of the battery holder 70 viewed from the back side, and FIG. 9 is a perspective view of the battery holder 70 viewed from the front side.

  The battery holder 70 accommodates two single dry batteries B in two rows, and the left and right two rows of batteries B are arranged in the reverse direction so that the four batteries B are connected in series. 71 is a receiving surface having a semicircular cross section for disposing the battery B, 72 is an alignment partition standing between the receiving surfaces 71, 71, 73 is a drop-out preventing claw protruding from the center of the front end of the receiving surface 71, 74 is formed on the inner surface of the rear wall of the battery holder 70, and a rail-shaped protrusion for arranging a series connection line 82 to be described later, and 75 is formed on the inner surface of the front wall facing the rail-shaped protrusion 74. A similar projection 81 is an insertion hole into which the positive electrode tip of the battery B is inserted, 84 is a projection for arranging a coil spring 83 connected to the negative electrode of the battery B, and 76 is provided on the back surface. These are irregularities that fit into the irregularities 61 of the frame 60, and these are integrally formed of resin.

  The series connection line 82 shown in FIG. 9 connects two rows of batteries B in series. The spiral 82a that the positive electrode of the battery B contacts, the spring 82b that the negative electrode of the battery B connects, The spring 82b urges the battery B and attaches it to the battery holder 70. The arm 82c connects 82a and 82b. The coil spring 83 is fixed to a conductive support plate 85 that fits into the protrusion 84, and biases the connected battery B to mount the battery B. The support plate 85 contacts the tip of the conductive member 33 fixed to the holding plate 26 of the lower case 20 through the insertion hole 81 of the battery holder 70. Compared with the battery holder described in Japanese Utility Model Laid-Open No. 61-145471, the battery holder 70 has two parts for electrical connection of the battery B, that is, the series connection line 82 and the coil spring 83, and a large number of parts. The battery B can be held accurately and smoothly inserted and removed, and is optimal for use in this type of scale.

  The overall configuration of the electronic balance 1 has been described above. In the electronic balance 1, except for the load cell 42, the weighing pan 2, the balance body 16, the load receiver 36, the battery holder 70, and the like are all made of resin, and are much lighter than existing scales. Further, the thin molding of the weighing pan 2 and the upper and lower cases 20 and 50 has an advantage of absorbing their own bending applied during the weighing operation and movement.

  The attachment of various components to the lower case 20 will be described with reference to FIGS. First, the fixing body 45 is screwed to both the left and right sides of the lower case 20, and then the fixing plate 48 is overlapped on the fixing body 45 and screwed, and the load cell 42 is screwed to the fixing plate 48, These are integrated into the lower case 20. Next, the load receiver 36 to which the fixing plate 49 is fixed is aligned on the load cell 42 and screwed. As a result, the load cell 42 is accommodated symmetrically on both sides of the scale body 16, and a space for arranging the battery holder 70 is provided between them. The work order of the two load cells 42 may be set individually or in parallel.

  The attachment of the upper case 50 to the lower case 20 will be described with reference to FIGS. When the outer wall 21 of the lower case 20 and the fitting wall 51 of the upper case 50 are fitted together, the supporting parts of the lower case 20 are sealed by the upper case 50, and the side wall 27 of the lower case 20 and the partition plate 55 of the upper case are sealed. The battery holder chamber 56 is formed between the left and right load cells 42, 42 by the fitting. In addition, the load cell 42 and the substrate PB are separated from the battery housing chamber 56 by the fitting of the side wall 27 and the partition plate 55. By separating the battery storage chamber 56 from the load cell 42, water and dust are prevented from entering the battery storage chamber 56, and malfunction of the electronic circuit is prevented.

  A rotatable battery cover 58 is pivotally fixed to the lower edge of the support frame 60 on the back side of the upper case 50 in advance, and the battery cover 58 is rotated to expose the battery holder 70 from the exposed opening 57. Is inserted into the battery housing chamber 56. At that time, the battery holder 70 is fixed in the battery housing chamber 56 by engaging the unevenness 61 on the back surface of the battery holder 70 with the unevenness 61 of the upper case 50. The scale body 16 is completed as described above.

  As shown in FIG. 1, the battery cover 58 of the present embodiment is an open / close type and is not a detachable type used in home appliances. The battery cover 58 pivotally supported by the support frame 60 is rotated outward by simply depressing the pressing portion 51 at the center of the surface, releasing the three locking claws 59 at the upper end from the locking openings, and releasing the finger. The opening 57 of the balance body 16 is exposed. For this reason, compared with the detachable battery cover used for home appliances and personal computers, there is an advantage that the mounting work of the cover itself can be omitted. The battery cover 58 is not directly fixed to the scale body 16 but is pivotally supported by the support frame 60 and screwed accurately. That is, since the support frame 60 and the battery cover 58 are assembled in a separate process from the scale body 16, the entire assembling work is efficient. The battery cover 58 is flush with the back surface of the scale body 16 and maintains a unified design.

  A process of attaching the tray receiver 6 to the scale body 16 will be described with reference to FIGS. First, the through hole 11 of the tray receiver 6 is aligned with the protrusion 39 of the load receiver 36, and the tray receiver 6 is mounted on the scale body 16. As a result, the protrusion 39 is exposed from the through hole 11, the leg 9 of the dish receiver 6 is mounted on the elastic ring R, and the dish receiver 6 is positioned. At the same time, the outer ring 18 of the tray receiver 6 covers the insertion port 53 of the upper case 50 and is disposed outside the flange 54 of the upper case 50, so that intrusion of dust and moisture through the insertion port 53 is suppressed.

  Furthermore, fixation of the tray receiver 6 using the fastener 12 will be described. As shown in FIG. 5, the fastener 12 is configured such that the screw 14 is screwed into the protrusion 39 on the upper surface of the load receiver 36, and the tray receiver 6 is fixed to the load receiver 36. At this time, the leg 9 of the tray receiver 6 does not come into contact with the fastener 12 and does not hinder its load absorbing action. Further, the screwing operation of the fastening tool 12 has a load absorbing action of the elastic ring R, so that it is not necessary to arrange the tray receiver 6 in a truly horizontal manner and can be performed quickly.

  The mounting of the upper plate 3 to the tray receiver 6 will be described. When the hook 5 of the upper plate 3 is aligned with the concave portion 10 for arranging the plate receiver 6 and the entire upper plate 3 is pushed down, the lower surface of the upper plate 3 comes into contact with the plate receiver 6 and the hook 5 is arranged. The concave portion 10 is slid and locked (see FIGS. 2, 4 and 6). With this locking, the upper plate 3 is mounted on the plate receiver 6 without moving in the left-right direction, the front-rear direction, and the lower direction. At this time, since the upper plate 3 covers the upper surface and the outer peripheral surface of the plate receiver 6, entry of dust into the through hole 11 of the plate receiver 6 is suppressed. Even if it penetrates, it is held in the reservoir formed by the vertical and horizontal grid-like ribs 8, so that it does not enter the scale body 16.

  Further, since the upper plate 3 does not fall off with the mounting of the upper plate 3, the upper plate 3 is mounted with no backlash, so that there is an advantage that it can be wiped and cleaned while the upper plate 3 is mounted. Furthermore, although the upper plate 3 is thin, since the load on the upper plate 3 is received by the ribs 8 on the upper surface of the plate receiver 6, the upper plate 3 is not bent.

  The removal of the mounted upper plate 3 will be described. There is a case where dirt on the upper plate 3 is washed during loading of food or accurate weighing. In this embodiment, the hook 5 of the upper plate 3 can be released from the recess 7 of the plate receiver 6 with which the hook 5 engages by simply pushing up the hook 5 of the upper plate 3, and the upper plate 3 can be easily removed from the plate receiver 6. it can. Without moving the electronic balance 1, only the upper plate 3 can be brought in and cleaned.

  The accommodation of the battery holder 70 in the battery holder chamber 56 will be described. First, the battery cover 58 is opened, and the tip of the battery holder 70 is aligned with the opening 57 of the upper case 50. Then, when the tip is inserted into the scale body 16, the lower surface of the battery holder 70 comes into contact with the rib 23b on the lower case 20, Move forward smoothly. When the battery holder 70 is further pressed, the tip of the battery holder 70 comes into contact with the conductive member 33 on the lower case 20 and stops. With the stop, the unevenness 76 on the back surface of the battery holder 70 is aligned with the unevenness 61 of the balance body 16. Next, when the back surface of the battery holder 70 is pushed down, the irregularities 76 are fitted into the irregularities 61, and the battery holder 70 is attached to the balance body 16 by the force of the spring.

  Even when the battery holder 70 is attached, the battery B of the battery holder 70 and the conductive member 33 continue to be connected. That is, of the two conductive members 33 arranged on the holding plate 26, one is maintained on the positive electrode of the battery B in the battery holder 70 and the other is maintained on the negative electrode of the battery B by the biasing force. No worries about poor contact.

  The removal of the accommodated battery holder 70 will be described. Contrary to the above, the claws 59 of the battery cover 58 are removed from the support frame 60 and opened. Next, the back surface of the battery holder 70 is confirmed from the opening 57 and pushed up against the spring force of the conductive member 33 to release the engagement of the unevenness 76 on the back surface of the battery holder 70 with the unevenness 61. When the hand is released, the rear end of the battery holder 70 is slightly protruded from the opening 57 of the upper case 50 by the spring force of the conductive member 33. The battery holder 70 is taken out by grasping and pulling out the battery holder 70 protruding from the back surface. This drawing operation is smooth because the lower surface of the battery holder 70 moves while being in contact with the ribs 23b of the lower case 20. Since the battery is exchanged on the back of the electronic balance 1 through the insertion and removal of the battery holder 70, the whole balance can be exchanged without turning it over. In the embodiment, the battery holder 70 is accommodated, but the connecting member of the battery holder 70 may be disposed in the battery holder chamber 56 and the battery may be taken in and out.

  The weighing operation of the electronic balance 1 will be described. As with a general electronic balance, the power switch is turned on, mounted on the weighing pan 2, the measurement value is confirmed, and the object to be weighed is removed. Description of operations and operations common to existing electronic scales is omitted. When an object to be weighed is mounted on the weighing pan 2, the load is divided into four load transmitting legs 9 on the lower surface of the tray receiver 6 and then transmitted to the load receiver 36 through the elasticity of the elastic ring R. The Each load receptacle 36 collects two loads into one and transmits the load to the load cell 42, and finally, the measured values of the two load cells 42 on the left and right are summed and displayed.

  In transmitting the load to the load cell 42, there are further advantages as follows. Since two load cells 42 are used for a single load cell scale, excessive stress on each load cell 42 is suppressed. Further, the impact load is not only distributed by the four legs 9, but also the load receiver 36 collects two loads and performs a buffer function, so that there are double impact countermeasure means. For impact loads that cannot be absorbed, the downward movement of the load cell 42 is limited by the collision with the stopper S on the lower surface of the load receiver 36. However, the impact force is weakened along with the impact absorption described above. The damage of is eliminated.

  The operation of the elastic ring R will be described. With a scale that only mounts a weighing pan on a tray bearing, the horizontal placement of the weighing pan is complicated so as not to cause an error. The elastic ring R is shallow for a light load, sinks deeply for a heavy load, absorbs an uneven load due to the non-horizontal arrangement of the weighing pan 2, and does not have a harmful effect due to a slight misalignment of the weighing pan 2. Accordingly, there is an advantage that the dimensional accuracy of various parts relating to the horizontal arrangement of the weighing pan 2 and the vertical adjustment legs F can be eased, and the complicated horizontal arrangement work can be omitted.

The movement after the end of the measurement can be carried by holding the handle 52 of the electronic balance 1 and carrying it with one hand. This handle 52 has an inverted V shape, and is easy to insert and difficult to remove. Of course, the present invention can be applied to other scales than the electronic scale 1.

According to the electronic balance 1 described above, a pair of load detection mechanisms 35 are arranged symmetrically on the left and right side surfaces of the balance body 16, and a large space for a battery housing portion is provided between the load detection mechanisms 35, 35. Therefore, various parts are arranged on the lower case 20 in a well-balanced manner, the center of gravity is maintained at the center, and stable weighing is performed. Further, the trouble of reversing the scale when replacing the battery is eliminated, the battery can be easily replaced from the back, and there is no need to reverse the scale, so that fine adjustment such as offset adjustment as in the prior art becomes unnecessary.

The electronic balance 1 described above can be modified as follows according to its purpose and mode. The legs 9 of the tray receiver 6, the insertion port 53 of the upper case 50, and the elastic ring R are all circular, but may be polygonal as long as they have a fitting relationship. The load cell 42 is fixed to both sides of the lower case 20 in order to easily insert and remove the battery holder 70 from the back surface of the balance body 16. In an electronic balance that does not contain a battery, the load cell 42 is arranged in front of and behind the balance body 16. You may do it. It is not essential for the elastic ring R to be interposed between the weighing pan 2 and the load receiver 36. Of course, the case where the weighing pan 2 is directly mounted on the load receiver 36 is included in the scope of the claims of the present invention. . The guides and ribs appearing in the present specification do not necessarily have a lattice shape, and may be configured by only one of the vertical and horizontal directions constituting the lattice, or may be formed with ribs oblique to the lattice. Good. The parts supported by the lower case 20 in the above embodiment are not necessarily supported by the lower case 20 and may be supported by the upper case 50.

The perspective view of the electronic balance of the present invention viewed from the back Perspective view showing relationship between weighing pan and scale body A perspective view of the lower case showing the mounting state of various parts XX sectional drawing of the electronic balance shown in FIG. Exploded view of FIG. YY sectional view of the electronic balance shown in FIG. Exploded view of FIG. A perspective view of the battery holder as seen from the back side A perspective view of the battery holder as seen from the front side

Explanation of symbols

1: Electronic scale 2: Weighing pan 3: Upper plate 5: Hook 6: Dish receiver 7: Recess 8: Rib 9: Leg 10: Recess 11: Through hole 12: Fastener 13: Knob 14: Screw 15: Mounted Piece 16: Scale body 18: Outer ring 20: Lower case 21: Outer wall 22: Inner wall 23a: Rib 23b: Rib 26: Holding plate 27: Side wall 28: Protrusion 29: Protrusion 30: Protrusion 31: Protrusion 32: Seal 33: Conductive Member 34: Contact part 35: Load detecting mechanism 36: Load receiving body 37: Rib 38: Mounting hole 39: Protrusion 40: Recess 41: Male screw 42: Load cell 43: Fixed part 44: Movable part 45: Fixed body 46: Rib 47: mounting hole 48: fixing plate 49: fixing plate 50: upper case 51: fitting wall 52: handle 53: insertion hole 54: flange 55: partition plate 56: battery holder chamber 57: opening 58: battery cover 59: claw 60: Support frame 61: Concavity and convexity
62: Holding part 70: Battery holder 71: Receiving surface 72: Partition 73: Claw 74: Protrusion 75: Protrusion 76: Concavity and convexity 81: Insertion hole 82: Connecting wire 82a: Spiral 82b: Spring 82c: Arm 83: Coil spring 84: Protrusion 85: Support plate R: Elastic ring B: Battery PB: Circuit board H: Level device S: Stopper F: Level adjustment leg SW: Operation key D: Display

Claims (1)

A scale body consisting of upper and lower cases;
A weighing pan disposed on the scale body;
A load cell housed in the scale body to receive the load of the weighing pan;
In an electronic scale having a battery holder housing in the scale body,
The load cell is fixed symmetrically on the lower case, and the space between the load cells serves as the battery holder accommodating portion,
An opening through which the battery holder passes on the back surface of the scale body, and a rotary battery cover that is pivotally supported to close the opening are provided.
An electronic balance in which a conductive member is disposed in front of the battery holder housing portion, abutting and stopping the battery holder, and electrically connected to the battery in the battery holder,
Placing the battery holder in the center of the scale body;
The battery holder housing portion is covered with upper and lower cases constituting the scale body, is extended in a vertical direction from the upper and lower cases, and is separated by a partition wall with which the tips are fitted to each other. An electronic balance characterized in that the balance main body can be taken out without being inverted through the opening when the battery cover is open .

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