JP5256175B2 - Back ring for school bag - Google Patents

Description

  The present invention relates to a back ring for connecting a shoulder belt attached to a back plate of a school bag.

  Conventionally, the back plate constituting the school bag is formed by forming a cushion portion at the center and peripheral edge of the front side and providing a flat back ring attachment ground on the upper side. On the other hand, the back ring pivotally supports a swing arm that can be pivoted in the left-right direction by urging the lower ring with a spring at the left and right symmetrical positions, and the upper end of the swing arm from the upper end of the back ring. A connecting portion that connects one end of a pair of shoulder belts to the protruding connecting portion is provided integrally or separately.

  When fixing the back ring to the back plate, since the total weight of the school bag is added to the back ring, in order to prevent the back ring from coming off from the back plate, a plurality of different metal screws and rivets are used, Also, it is known that it is fixed to a metal fixing plate attached to the back side of the back plate, or is fixed by caulking the tip of a rivet.

JP 2002-58516 A Utility model registration No. 3135407 Utility model registration No. 3144066

  In addition, the attachment place for attaching the back ring provided above the surface of the back plate is covered with a protective fabric made of leather or synthetic leather different from the surface of the back plate, which is clearly the surface of the back plate There is a sense of incongruity.

  Furthermore, since metal screws and screws for fixing the back ring to the back plate can be seen from the surface side of the back plate, a metal decorative plate or the like is attached to the back ring to hide the screw head from the surface side. Since it is attached to the surface, there is a problem that the school bag becomes heavy.

  Furthermore, the school bag is usually used for a long period of 6 years from the first grade to the sixth grade, and the schoolchild is rough in handling the school bag. It has problems such as the risk of injury.

  The problem to be solved by the present invention is that the flat part for attaching the back ring provided at the upper center of the back plate can be made small so that the cushion part of the back plate can be extended to the upper end part of the back plate. As a result, when the school bag is carried on the back, the head is prevented from being injured by hitting the back ring, and metal parts such as screws and decorative brackets for attaching the back ring to the back plate are eliminated, thereby reducing the weight of the whole school bag. Furthermore, the entire back ring is made of a synthetic resin material to reduce the weight, and it is also intended to simplify the attachment to the back plate and to make the back plate look clear and to eliminate the uncomfortable feeling.

In order to achieve the above object, the present invention provides a back plate 1 provided with a plurality of mounting holes 2 for mounting the back ring 20 in the center of the upper portion, and a pin hole 9 on the tip surface of the shaft portion 8 inserted through the mounting hole. An independent holding shaft piece 7 that is formed with a locking head portion 10 formed on the peripheral surface of the front end and a holding collar portion 13 that is in contact with the back surface of the back plate 1 at the rear end, and the front end surface of the shaft portion 8. Each of the shaft portions 8 and 8 has a plurality of shaft portions 8 and 8 each having a pin hole 9 formed therein, a locking head portion 10 provided on the peripheral surface of the front end, and a holding hook portion 17 that is in contact with the back surface of the back plate 1 formed integrally at the rear end. A shaft holding hole 16 is provided at a position that coincides with the mounting hole 2 of the back plate, and the independent holding shaft piece on the inner wall surface of the shaft hole. 7 and back ring main bodies 21 provided with biting ring portions 28 for engaging the locking heads 10 of the simultaneous holding shaft pieces 16 and fitting them in a structure. From the cover body 42 to which the press-fit pins 45 for press-fitting the pin holes 9 provided in the front end surfaces of the independent holding shaft piece 7 and the simultaneous holding shaft piece 16 are respectively located at positions matching the shaft holes 26 of the back ring body. Thus, the independent holding shaft piece 7 and the continuous holding shaft piece 16 are inserted into the mounting hole 2 of the back plate 1 from the back surface side, respectively, and the tip is projected to the front surface side, and then the shaft hole 26 of the back ring main body 21 is formed. The biting ring portion 28 provided inside and the locking head portion 10 of each shaft 8 are fitted and fixed, and the press-fit pin 45 of the cover body is inserted into the independent holding shaft piece 7 from the surface side of the back ring body. In addition, it is characterized in that it is formed by being press-fitted and fixed in pin holes 9 provided at the tips of the simultaneous holding shaft pieces 16. Further, an auxiliary shaft 14 for preventing rotation is integrally provided at a position away from the shaft portion 8 on the holding collar portion 13 provided at the rear end of the shaft portion 8 of the independent holding shaft piece 7. . Further, the back ring main body 21 is fitted with a fitting recess 27 in which the annular convex portion 44 of the cover body 42 is fitted in the vicinity of the exit of the shaft hole 28 provided at a position matching the mounting hole 2 of the back plate 1. Are formed on the inner side of the fitting recess, and a plurality of slits 29 are formed in the centrifugal direction of the biting ring portion. The oscillating arm 22 is pivotally supported by the arm shaft 24 so as to be pivotable in the left-right direction by urging each other downward with a spring at a symmetrical position inside, and a locking plate 38 is inserted at the upper end of the center. The mounting groove 32 is provided, and a shaft hole 33 through which the independent holding shaft piece 7 is inserted is provided in the center of the mounting groove. Furthermore, the suspended portion 36 is an upper portion of a locking plate 38 through which a base portion of a suspended ring 37 formed by bending the center of a metal wire into a substantially annular shape is inserted into a mounting groove portion 32 provided in the upper center of the back ring body 21. A flexible bite provided with a slit 41 into which a locking head 10 of the independent holding shaft piece 7 is fitted in a shaft hole 39 provided pivotally in the center and provided in the center of the locking plate. The insertion ring part 40 is formed integrally. In addition, the cover body 42 is formed with a fitting portion 43 to be attached to the back ring main body 21 on the back surface, and a ring-shaped annular protrusion that fits with the fitting portion 27 provided in each shaft hole 26 of the back ring main body 21. Each of the portions 44 is provided, and a press-fit pin 45 that matches the pin hole 9 provided at the tip of the independent holding shaft piece 7 and the continuous holding shaft piece 16 is integrally provided in the center of the annular convex portion, and the leather is provided in the central decorative portion 48. Alternatively, the decorative plate 49 made of synthetic leather is formed integrally with the cover body 42.

  Accordingly, since each component for attaching the back ring 20 to the back plate 1 is not exposed to the metal parts used on the surface, the weight can be reduced, and the attachment to the back plate 1 can also be performed by each component (back plate main body). , The cover body) can be easily attached with a single touch, and the assembly work can be improved. Furthermore, since the space for attaching the back ring 20 to be mounted on the upper surface of the back plate 1 can be reduced, the cushion portion 5 can be formed up above both ends of the back plate 1, and the back ring 20 when carrying the school bag. Has the advantage of improving safety because it is not hit by the head of school children.

It is the front view which abbreviate | omitted a part of back plate which attached the back ring which concerns on this invention. It is a rear view of the back board partially omitted. It is the sectional view on the AA line of FIG. It is an exploded sectional view of a back ring. It is a front view of an independent holding shaft piece. It is a front view of a simultaneous holding shaft piece. FIG. 6 is a sectional view taken along line BB in FIG. 5. It is a front view of a back ring main body. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is a front view of a hanging ring. It is the EE sectional view taken on the line of FIG. It is a reverse view of a cover body. It is the FF sectional view taken on the line of FIG. FIG. 6 is a cross-sectional view in which a holding shaft piece and a back ring body are fitted and fixed. It is sectional drawing of the state which made the cover body fit to the back ring main body of FIG. It is an expanded sectional view of the state where the independent holding shaft piece, the suspension ring, and the cover body were respectively fitted and fixed.

  BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially omitted front view of a back plate to which a back ring according to the present invention is attached; FIG. 2 is a partially omitted rear view of the back plate; 3 is a sectional view taken along line AA in FIG. 1, FIG. 4 is an exploded sectional view of a back ring, FIG. 5 is a front view of an independent holding shaft piece, FIG. 6 is a front view of a simultaneous holding shaft piece, and FIG. 8 is a front view of the back ring main body, FIG. 9 is a cross-sectional view taken along the line CC of FIG. 8, FIG. 10 is a cross-sectional view taken along the line DD of FIG. 8, and FIG. 12 is a cross-sectional view taken along line EE of FIG. 11, FIG. 13 is a back view of the cover body, and FIG. 14 is a cross-sectional view taken along the line FF of FIG. The back ring 20 is formed of a back ring main body 21 formed of a synthetic resin material, a suspension ring 37 attached to the center upper end of the back ring main body 21, and a synthetic resin material covering the surface of the back ring main body 21. Similarly, the back ring 20 is formed by fixing a plurality of independent holding shaft pieces 7 and simultaneous holding shaft pieces 16 from the back surface side of the back plate 1.

  The back plate 1 is made of a non-woven fabric impregnated with a synthetic resin material and hardened, or a cardboard paper impregnated with a synthetic resin material and cured, for example, a core plate formed using a synthetic resin plate or the like. In addition, the surface of each cushion portion 5 formed by attaching a foamed synthetic resin material having a cushion function to a predetermined shape to the left and right sides, the center portion, and the lower portion of the surface of the core material is formed of natural leather or synthetic leather, etc. A mounting hole 2 through which the independent holding shaft piece 7 and the continuous holding shaft piece 16 are inserted is provided in a flat portion 6 which is formed by covering with a surface material 4 and is provided in the upper center of the back plate 1.

  As shown in FIGS. 5, 6, and 7, the independent holding shaft piece 7 and the simultaneous holding shaft piece 16 have a pin hole 9 formed in the tip surface of the shaft portion 8 formed of a synthetic resin material, and the peripheral surface of the tip portion. Each of the locking heads 10 having a fitting-in structure is provided. This fitting structure is formed by forming an orthogonal surface with respect to the axial direction on the lower side of the head formed to have the same diameter as the axial portion, and inclining the insertion direction of the axial portion 8 with respect to the orthogonal surface 12 11 is formed integrally.

  As shown in FIG. 7, the independent holding shaft piece 7 is integrally formed with a plate-like holding hook portion 13 arranged orthogonal to the end portion of the shaft portion 8, and the holding hook portion includes the shaft portion 8 and the shaft portion 8. A short auxiliary shaft 14 for preventing rotation is provided integrally in parallel with a little distance, and is inserted into the auxiliary hole 3 provided on the back side at the center upper side of the back plate 1.

  Since the shaft portion 8a of the simultaneous holding shaft piece 16 is formed to be substantially the same as the shaft portion 8 of the independent holding shaft piece 7, the reference numeral 8a is denoted and description thereof is omitted here. This simultaneous holding shaft piece 16 has a plate-like holding collar portion 17 provided at an end portion of each shaft portion 8a at a position matching the left and right sides and the center lower side of the mounting hole 2 of the back plate 1 and a connecting plate 18. Are integrally formed.

  As shown in FIGS. 8, 9, and 10, the back ring main body 21 is pivotally supported by an arm shaft 24 so that the lower part is urged toward the center by a spring at a symmetrical position inside, and the upper part is pivotable in the left and right direction. A connecting portion 23 in which the upper end of the swing arm 22 is protruded upward from the upper end of the back ring main body 21 is integrally formed.

  A shaft hole 26 is provided at each of the left and right ends of the back ring body 21 at positions matching the mounting holes 2 of the back plate 1, and the shaft of the independent holding shaft piece 7 or the simultaneous holding shaft piece 16 is provided on the outlet side of the shaft hole. An annular fitting groove 27 that engages the portions 8 and 8a and an annular biting ring portion 28 that fits together with the locking head portion 10 of the simultaneous holding shaft piece 16 in a fitting structure are integrally formed. It is.

  An attachment groove 32 for inserting the locking plate 38 of the suspension ring 37 is formed in the center upper end surface of the back ring main body 21, and a shaft hole 33 through which the independent holding shaft piece 7 is inserted on the center back side of the attachment groove. Provided on the front surface side is a receiving hole 34 into which a fitting convex portion 44 provided on the back surface side of the cover body 42 is fitted.

  As shown in FIGS. 11 and 12, the hanging part 36 has a hanging ring 37 formed by bending the center of a metal rod into a substantially annular shape and forming the lower ends formed in parallel with a narrow width in a bowl shape. The back ring body 21 is pivotally attached to an upper portion of a locking plate 38 that is detachably inserted from the upper portion in the center of the upper portion. An annular biting ring portion 40 is integrally provided in a shaft hole 39 provided in the upper center of the locking plate 38 so as to fit with the locking head portion 10 of the independent holding shaft piece 7 in a fitting structure. is there.

  The biting ring portion 28 provided in the shaft hole 26 of the back ring main body 21 and the biting ring portion 40 provided in the shaft hole 39 of the locking plate 38 of the hanging portion 36 are respectively connected from the inlet direction to the outlet direction (engagement). The stop plate 38 is formed concentrically with an inclined surface (from the front surface side to the back surface side direction), and a plurality of slits 29 and 41 are formed at regular intervals in the centrifugal direction on the outlet side (front surface side) of the biting ring portion. By providing, the biting ring portions 28 and 40 are given elasticity and flexibility.

  A holding shaft piece press-fitted into the shaft holes 26 and 39 from the back side of the back ring body by providing a plurality of slits 29 and 41 provided along the inner peripheral surfaces of the biting ring portions 28 and 40. The locking heads 7 and 16 abut against the inclined surface of the biting ring portion 28, and the pressing head 10 spreads the biting ring portions 28 and 40 in the circumferential direction so that the locking head portion 10 becomes the biting ring portion. When passing through 28 and 40, the elastic force of the biting ring portion fits and locks on the inclined surface 11 of the shaft portion 8.

  When the locking head portions 10 of the holding shaft pieces 7 and 16 are fitted and locked to the biting ring portions 28 and 40 in the shaft holes 26 and 39, the end portions of the holding shaft pieces 7 and 16 ( That is, the holding hooks 13 and 17 provided on the back surface cannot contact the back surface of the back plate 1 to advance, and the orthogonal surface 12 provided on the lower surface of the locking head 10 of the holding shaft pieces 7 and 16. The leading ends of the biting ring portions 28 and 40 come into contact with each other and are fitted and locked in a killed state.

  As shown in FIGS. 13 and 14, the cover body 42 is made of a synthetic resin material, and forms a fitting portion 43 into which the back ring main body 21 is fitted inside the back surface, and each axis of the back ring main body 21 is formed. Each of the annular protrusions 44 that match the fitting recess 27 provided in the hole 26 is provided, and the shaft portion of the press-fit pin 45 that is press-fitted into the pin hole 9 of the holding shaft pieces 7 and 16 at the center of the annular protrusion. 46 is established.

  In this cover body 42, a decorative plate 49 made of leather or synthetic leather is integrally formed on a decorative portion 48 provided at the center of the surface. 52 is a sponge piece that, when the cover body 42 is attached to the back ring main body 21, is interposed on the back surface of the decoration plate 49 provided in the center of the cover body 42 to give the decoration plate 49 a volume feeling. .

  The length of the press-fit pin 45 is formed to be substantially the same as or substantially shorter than the length of the pin hole 9, and the press-fit pin is formed in a concentric and multi-stage manner on the axial circumferential surface of the press-fit pin at regular or arbitrary intervals. The biting blade 47 has an inclined surface with respect to the advancing direction of the shaft portion 46 and has an orthogonal surface in the retreating direction, and has an action that cannot be retreated after being press-fitted into the pin hole 9. Yes. Furthermore, the slightly large-diameter head provided at the base of the press-fit pin 45 and the decorative plate 49 attached to the decorative portion 48 are formed so as to be integrally embedded in a member forming the cover plate 42.

  When a force in the pulling direction is applied to each press-fit pin 45 press-fitted into the pin hole 9 of each holding shaft piece 7, 16, the diameter of the press-fit pin 45 is 1 mm, for example, and the diameter of the head of the pin is 4 When it is connected to the back ring using the pin, it can withstand a force of about 30 kg. Accordingly, since it is possible to withstand a force of 70 to 100 kg by increasing the diameter of the pin to 2 to 3 mm, the cover plate 42 is fixed to the back ring main body 21 by crimping, so that the back ring 1 is connected to the back plate 1. It is possible to prevent 20 from leaving.

  Hereinafter, a method for attaching the back ring 20 to the back plate 1 according to the embodiment of the present invention will be described with reference to FIG. 4. The first step is to install the back ring 20 in the attachment hole 2 provided in the upper center of the back plate 1. The shaft portions 8 and 8a of the independent holding shaft piece 7 and the simultaneous holding shaft piece 16 are inserted from the back side of the plate, respectively.

  The holding hooks 13 provided at the bases of the independent holding shaft piece 7 and the simultaneous holding shaft piece 16 are brought into contact with and engaged with the back surface of the back plate 1. In this case, the auxiliary shaft 14 provided below the holding collar portion 13 of the independent holding shaft piece 7 is fitted into the auxiliary hole 3 of the back plate to prevent rotation of the independent holding shaft piece 7, By making wide contact with the back plate 1, it is possible to counter the tensile force applied to the hanging ring 37 into which the independent holding shaft piece 7 is fitted.

  In the second step, a locking plate 38 is received from above in a mounting groove 32 provided at the center upper end of the back ring main body 21 that accommodates the swing arms 22, 22, and the shaft hole 39 of the locking plate and the back ring main body are accommodated. 21 shaft hole 33 and hole 34 are located on the same axis.

  Next, as shown in FIG. 15, the third step is to connect the shaft portion 8 of the independent holding shaft piece 7 inserted into the mounting hole 2 of the back plate 1 from the back surface side into the shaft hole 39 of the locking plate 38 of the back ring body 21. The shaft portion 8a of the simultaneous holding shaft piece 16 and the shaft hole 26 of the back ring main body 21 are matched and pressure-bonded.

  Since the biting ring portions 28 and 40 are provided with a plurality of slits 29 and 41 respectively in the peripheral surface portion, the biting ring portion is pressed by the pressing force of the shaft portions 8 and 8a press-fitted into the shaft holes 26 and 39. When the locking head 10 positioned at the tip of the holding shaft pieces 7 and 16 passes through the biting ring portions 28 and 40 by pushing the 28 and 40 in the circumferential direction, the biting ring portions 28 and 40 are elastic. To return to the original state and fit to the inclined surface 11 of the locking head 10.

  The holding shaft pieces 7 and 16 locked to the biting ring portions 28 and 40 in the shaft holes 26 and 39 are respectively in contact with the back surface of the back plate 1 by the holding collar 13 provided at the lower end of the holding shaft piece. The tip of the biting ring portions 28 and 40 hit the orthogonal surface 12 provided on the lower surface of the locking head 10 of the holding shaft pieces 7 and 16 and cannot move backward, so that the so-called fitting is killed. Can be engaged.

  In the fourth step, as shown in FIG. 16, the plurality of press-fit pins 45 attached to the cover body 42 are matched with the pin holes 9 of the holding shaft pieces 7, 16 to press the cover body 42 to the back ring body 21. . The tip of each press-fit pin 45 bites into each pin hole 9 while being pressed into the pin hole 9, and the cover body 42 is fixed to the end surface on the surface side of the back ring body 21. It is fitted and fixed in the provided fitting recess 27. Therefore, the cover body 42 does not rattle and can be reliably fitted to the back ring main body 21.

  Since the press-fit pin 45 has a biting blade 47 formed in multiple stages on the outer peripheral surface of the shaft portion 46 that is slightly larger than the pin hole 9, when the press-fit pin 45 is press-fitted into the pin hole 16, Although it press-fits while biting, when the force in the pulling direction acts, the biting blade bites into the inner wall surface and cannot be pulled out again.

  The fixing with the press-fit pin 45 is not performed by driving a plurality of rivets one by one as in the prior art, but as described above, the cover body 42 is simply pressed and pressed from the surface side of the back ring main body 21 as one touch. Since the back ring 10 can be assembled and fixed to the back plate 1, the work process can be omitted to improve efficiency.

  For attaching the back ring 20 to the back plate 1, the holding shaft pieces 7, 16 are fixed to the biting ring portions 28, 40 of the back ring main body 21, and the press-fit pin 45 of the cover body 42 is attached to the holding shaft pieces 7, 16. The back ring 20 can be prevented from falling off the back plate 1 because the back ring 20 can be firmly fixed by being press-fitted into the pin hole and double-connected. Further, since a large number of attachment parts are not required for the attachment work of the cover body 42, the assembling workability of the parts can be further improved.

  In assembly work to attach the back ring 20 to the back plate 1, the back ring 20 can be easily formed and attached to the back plate 1 with one touch without using metal parts exposed on the surface such as screws and rivets. Moreover, since it is not necessary to attach a decorative plate that hides the head, such as a rivet, the number of parts can be reduced, so that the cost can be reduced and the overall school bag can be reduced in weight.

DESCRIPTION OF SYMBOLS 1 Back plate 2 Mounting hole 7 Independent holding shaft piece 8 Shaft part 9 Pin hole 10 Locking head 11 Slope part 13 Holding hook part 16 Simultaneous holding shaft piece 17 Holding hook part 20 Back ring 21 Back ring body 22 Oscillating arm 23 Connecting part 26 Shaft hole 27 Fitting recess 28 Engaging ring part 29 Slit 32 Mounting groove part 33 Shaft hole 36 Suspended lower part 37 Suspension ring 38 Locking plate 39 Shaft hole 40 Engaging ring part 42 Cover body 43 Engaging part 44 Ring Convex part 45 Press-fit pin 46 Shaft part 47 Biting blade 48 Decoration part 49 Decoration plate

Claims (5)

A back plate (1) provided with a plurality of attachment holes (2) for attaching the back ring (20) in the upper center;
A pin hole (9) is formed in the distal end surface of the shaft portion (8) inserted through the mounting hole, a locking head (10) is formed on the peripheral surface of the distal end, and the rear surface of the back plate (1) is abutted on the base portion. An independent holding shaft piece (7) integrally formed with the holding collar (13) in contact therewith,
Pin holes (9) are respectively drilled in the front end surface of the shaft portion (8a), a locking head (10) is provided on the peripheral surface of the front end, and a holding collar (abutting on the rear surface of the back plate (1) at the rear end ( 17) a holding shaft piece (16) in which the holding hook portions of the plurality of shaft portions (8) integrally formed with the connecting piece (18) are connected;
A shaft hole (26) is provided at a position matching the mounting hole (2) of the back plate, and the locking head of the independent holding shaft piece (7) and the simultaneous holding shaft piece (16) is provided on the inner wall surface of the shaft hole. The independent retaining shaft piece (7) at a position matching the back ring main body (21) provided with the biting ring portion (28) for fitting the portion (10) and the shaft hole (26) of the back ring main body. ) And a cover body (42) provided with press-fit pins (45) for press-fitting pin holes (9) provided on the front end surface of the simultaneous holding shaft piece (16),
An independent holding shaft piece (7) and a simultaneous holding shaft piece (16) are respectively inserted into the mounting hole (2) of the back plate from the back side so that the end portion protrudes to the surface side, and the shaft hole of the back ring body (26) The biting ring part (28) provided in the inside and the locking head part (10) of each shaft part (8, 8a) are fitted and fixed, respectively, and the cover is formed from the surface side of the back ring body. A back ring for a satchel, wherein a body press-fit pin (45) is press-fitted and fixed to a pin hole (9) provided at the tip of each of the independent holding shaft piece (7) and the simultaneous holding shaft piece (16). .   An auxiliary shaft (14) for preventing rotation is provided at a position slightly away from the shaft portion (8) in the holding collar portion (13) provided at the rear end of the shaft portion (8) of the independent holding shaft piece. The back ring for a school bag according to claim 1, wherein:   The back ring body (21) is fitted with an annular convex part (44) of the cover body in the vicinity of the outlet of a shaft hole (28) provided at a position matching the mounting hole (2) of the back plate. A mating recess (27) is provided, and a biting ring portion (28) into which the locking head (10) of the simultaneous holding shaft piece (16) is fitted is formed inside the fitting recess, A plurality of slits (29) are provided on the inner peripheral surface of the insertion ring part, and the swing arm (22) is pivotable in the left-right direction by urging the lower side of the inner left-right symmetric position toward each other with a spring. A mounting groove (32) is provided which is pivotally supported by the shaft (24) and into which the locking plate (38) is inserted at the center upper end, and a shaft hole (33) through which the independent holding shaft piece (7) is inserted in the center of the mounting groove. The back ring for a satchel according to claim 1, wherein the back ring is provided.   The hanging part (36) is a member for inserting a base part of a hanging ring (37) formed by bending the center of a metal rod into a substantially annular shape into a mounting groove part (32) provided in the upper center of the back ring body (21). The stopper plate (38) is pivotally attached to the upper center, and the locking head (10) of the independent holding shaft piece (7) is fitted in the shaft hole (39) provided in the center of the locking plate. The back ring for a school bag according to claim 1, wherein a biting ring portion (40) having a resilient force provided with a plurality of slits (41) to be combined is integrally formed.   The cover body (42) has a fitting portion (43) attached to the back ring main body (21) on the back surface, and is provided in each shaft hole (26), (33) of the back ring main body (21). Each of the annular convex portions (44) to be fitted with the fitting concave portion (27) is provided, and provided at the tip of the independent holding shaft piece (7) and the simultaneous holding shaft piece (16) in the center of the annular convex portion. A press-fit pin (45) that matches the pin hole (9) is attached, and a decorative plate (49) made of leather or synthetic leather is formed integrally with the cover body 42 at the central decorative portion (48). The back ring for a school bag according to Item 1.

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