JP6134113B2 - Hinge mechanism - Google Patents

Description

  The present invention relates to a hinge mechanism that is relatively easy to attach to an apparatus main body and is suitable for a flip-up counter installed in a convenience store, a commercial dining kitchen, or a snack bar.

  In a convenience store or a commercial dining kitchen, as disclosed in Japanese Patent Application Laid-Open No. 2005-211125, a long counter including a cash register counter is installed, and a part of the counter is provided so that people can enter and exit the counter. A flip-up counter is provided. In this flip-up counter, one edge of the movable top plate is pivotally connected to the fixed top plate via a hinge. When the counter passes, the movable top plate is flipped up and rotated until it is fully opened, that is, rotated 180 degrees. Let While installing this flip-up counter, a swing door may be attached below the movable top plate as desired.

  When the flip-up counter does not always hold the movable top plate by hand when opening and closing the flip-up counter, the movable top plate falls to the horizontal position by its own weight from the middle of rotation, generating a large impact and noise. . For this reason, Japanese Patent Application Laid-Open No. 2007-315013 regulates the free fall of the top board by its own weight by using a torque hinge having a predetermined rotation resistance. As a result, when the movable top plate is released at any opening position, it stops at that position and does not fall freely to the horizontal position. The movable top plate may be rotated downward from the open state by hand and closed so as to be pressed by the hand when approaching the horizontal position. This hinge mechanism is such that the hinge is positioned below the top plate surface and there is no gap between the movable top plate and the fixed top plate, and the movable top plate falls by its own weight and generates impact and noise. There is nothing.

JP 2005-211125 A JP 2007-315013 A

  The hinge mechanism disclosed in Japanese Patent Application Laid-Open No. 2007-315013 has a beautiful appearance because the hinge is housed below the top plate surface and the movable top plate and the fixed top plate are flat and close to each other. The opening angle is limited to 95 to 100 degrees, and the movable top plate that is half open even at the maximum opening is in a standing state. The flip-up counter not only passes by hand, but often at convenience stores, it often passes with delivery luggage and in-store goods, so it is said that the open movable top plate is standing Luggage is caught on the movable top, and accidents that damage or drop the luggage tend to occur.

  The present applicant has already proposed Japanese Patent Application No. 2011-160604 as a hinge for a flip-up counter, and the present invention corresponds to a spread product. Compared with the hinge mechanism disclosed in Japanese Patent Application No. 2011-160604, the hinge mechanism of the present invention requires little processing of the counter surface on the mounted side, and the number of attachments can be increased or decreased relatively easily according to the required torque. is there.

  The present invention has been proposed in order to improve the above-mentioned problems relating to a conventional flip-up counter hinge and the like, and when mounted on a flip-up counter, the movable top plate is fully opened, that is, becomes 180 degrees horizontal. An object of the present invention is to provide a hinge mechanism that can be rotated up to and can be easily lifted in any direction of opening and closing, and that can be partially braked from a half-open position to a horizontal position to prevent free fall. Another object of the present invention is to provide a hinge mechanism that can be stationary in a state in which the movable top plate is opened approximately 90 degrees half open. Another object of the present invention is to prevent the upward rotation of the lid even if the downward rotation of a relatively heavy lid such as an open / close lid of a large copier or a piano back lid is effectively braked. It is another object of the present invention to provide a one-way braking hinge mechanism that can be easily attached to a device body.

The hinge mechanism according to the present invention has three leaf portions that can pivot relative to each other, and two parallel pivots penetrate through the barrels of the two attachment leaf portions and the through holes of the central leaf portion, respectively. with integrating the three leaf portion by said one-way wheel bar within barrel of the two mounting leaf portion stationary housing, supports each pivot capable unidirectional rotation through the one-way wheel, On the other hand, the plastic braking cylinder is stationaryly accommodated in the through hole of the central leaf portion, and the two pivots are press-fitted and passed through the braking cylinder to support the braking rotation. In this hinge mechanism, attaching one of the mounting leaf portion to the movable body, and by mounting the other mounting leaf portion to the fixed body, when pivoted from the total closing the movable body, the free rotation in either mounting the leaf portion Then, when half open, one side surface of the central leaf portion comes into contact with the surface of the main body, the mounting leaf portion is stationary, and when the movable main body is further swung, the central leaf portion is passed through another mounting leaf portion. The brake rotates until fully open.

  In the hinge mechanism according to the present invention, the central leaf portion is a rectangular flat rectangular plate body, and the plastic braking cylinder or the one-way wheel is stationaryly stored in a through hole formed close to both sides of the leaf portion, and is movable. In the half open state of the main body, the left side of the central leaf portion is in contact with the surface of the movable top plate, or the right side thereof is in contact with the surface of the fixed top plate. In the above-mentioned hinge mechanism, it is preferable that both attachment leaf portions are attached to the fixed surface of the flip-up counter and the adjacent surface of the movable top plate.

  The hinge mechanism for one-way braking according to the present invention has two leaf portions that can pivot relative to each other, and the pivot passes through the barrel of one leaf portion and the barrel of the other leaf portion, so that both leaf portions Is integrated. In this hinge mechanism, a one-way wheel is stationaryly stored in both barrels of one leaf part, and a pivot is supported so as to be rotatable in one direction via the one-way wheel, while a plastic braking cylinder is placed in the barrel of the other leaf part. The body is stored stationary, and the pivot is press-fitted through the brake cylinder so as to be supported for braking rotation.

  In the two hinge mechanisms according to the present invention, the plastic braking cylinder is composed of two flanged cylindrical bodies that are respectively housed in the through holes from the central leaf portion or the both side walls of the barrel, and the axial protrusions in the cylindrical body. It is preferable to stop in the through-hole by intervening and effectively brake the press-fitted pivot. In the hinge mechanism of the present invention, the one-way wheel that is stationaryly stored in both the barrels of the attachment leaf part or in the center or the barrel of the other leaf part has a load resistance of the hinge mechanism by increasing / decreasing the number of storages in the barrel. It is preferable to insert a plastic ring having substantially the same shape as the one-way wheel into the space created by reducing the number of one-way wheels stored.

  The hinge mechanism according to the present invention can be easily attached to the device main body using only commercially available bolts, compared to an equivalent product. Compared with an equivalent hinge mechanism, the hinge mechanism of the present invention does not require processing of the counter on the attached side, and the number of attachments can be increased or decreased according to the required torque. On the other hand, if a long groove is provided adjacent to the fixed top plate and the movable top plate of the counter and a hinge mechanism is installed in the long groove, there will be no part protruding from the top plate surface when the movable top plate is closed. Even if the product is slid on the top surface, it is not caught by the hinge mechanism.

  When the hinge mechanism according to the present invention is attached to the flip-up counter, the movable top plate can be easily lifted up freely in any direction of opening and closing, but it brakes from the middle of rotation to the horizontal position. Thus, even if the hand is released from the movable top plate, it does not fall freely, and it is possible to prevent noise and finger-filling accidents due to the fall of the movable top plate.

  When the hinge mechanism according to the present invention is attached to a flip-up counter, the movable top plate is stopped in the middle of rotation according to circumstances, and it is not necessary to use a useless force when passing the movable top plate. Even a simple woman can open and close easily. The hinge mechanism of the present invention can be attached not only to a flip-up counter installed at a convenience store, a commercial dining kitchen or a snack bar, but also to various devices that are fully open and open at 180 degrees.

It is a perspective view which shows the hinge mechanism which concerns on this invention. It is a top view which shows the hinge mechanism of FIG. 1, and has shown the cross section only one side of one attachment leaf part. It is a fragmentary perspective view which shows the flip-up counter to which the hinge mechanism based on this invention is applied. It is a perspective view which shows the attachment leaf part used with the hinge mechanism of FIG. It is a schematic side view which expands the one-way ring | wheel stationaryly accommodated in the barrel of an attachment leaf part, and shows one part in a cross section. It is a perspective view which shows the plastic ring which can be accommodated instead of a one-way ring. It is a side view which shows the center leaf part used with the hinge mechanism of FIG. It is a perspective view which shows one plastic brake cylinder which carries out stationary accommodation in the through-hole of a center leaf part. It is a perspective view which shows the other plastic brake cylinder used with the plastic brake cylinder of FIG. It is a side view of the hinge mechanism explaining the opening and closing process of the movable top plate with respect to the fixed top plate. It is a side view of the hinge mechanism which passes through the opening / closing process different from FIG. It is a perspective view which shows the hinge mechanism of the one-way braking which concerns on this invention. It is a perspective view which shows the other attachment leaf part used with the hinge mechanism of FIG.

  The hinge mechanism 1 (FIG. 1) according to the present invention is installed, for example, in the flip-up counter 3 of FIG. 3. In this case, the movable main body corresponds to the movable top plate 5, and the fixed main body serves as the fixed top plate 7. Equivalent to. In the hinge mechanism 1, one attachment leaf portion 8 is attached to the movable top plate 5, and the other attachment leaf portion 10 is attached to the fixed top plate 7. Although the hinge mechanism 1 protrudes upward from the top plate surface of the counter in FIG. 3, a long groove (not shown) is provided on the adjacent side of the movable top plate 5 and the fixed top plate 7, and the hinge mechanism 1 is provided in the long groove. When the movable top plate 5 is closed, the hinge mechanism 1 does not protrude from the top plate surface when the movable top plate 5 is closed.

  As shown in FIGS. 1 and 2, the hinge mechanism 1 has two attachment leaf portions 8 and 10 and a central leaf portion 12 that can pivot with respect to each other, and parallel pivots 14 and 16 (FIG. 2) The whole is integrated by penetrating through the barrel 18 of the attachment leaf portions 8 and 10 and the through hole 20 (FIG. 2) of the central leaf portion 12. The mounting leaf portions 8 and 10 are usually U-shaped flat plastic members having a plurality of bolt holes on the flat side portion, and this is changed to an E-shaped plane as desired, and two central leaf portions are provided. You may make it the aspect which installs.

  The leaf portions 8, 10 and 12 are made of, for example, polyamide FRP which can be appropriately colored, and the pivots 14 and 16 are made of stainless steel. For example, the attachment leaf portions 8 and 10 are bolted to the surfaces of the movable top plate 5 and the fixed top plate 7 (see FIG. 10). The hinge mechanism 1 is normally attached to the surface of the top plates 5 and 7 of the flip-up counter 3 at two symmetrical positions. However, if the load resistance is insufficient due to the size of the movable top plate 5, the hinge mechanism 1 is Four, four (FIG. 3), or five or more may be attached at equal intervals.

  The attachment leaf portions 8 and 10 are usually in the same shape as shown in FIG. 1, and both leaf portions may have different sizes as desired. As is apparent from FIG. 4, the mounting leaf portion 8 has a substantially horizontal U-shaped plane, and the cylindrical barrels 18 and 18 protrude upward in the lateral direction at a predetermined interval, and pivots in both barrels. 14 or 16 (FIG. 2) can be supported horizontally. Each barrel 18 is typically the same cylindrical shape, and its inner side wall 21 is provided with a through hole 22 slightly larger than the diameter of the pivot 14 (see FIG. 2). On the inner peripheral wall of the barrel 18, axial ridges 24 are formed at equal intervals in the circumferential direction (see FIG. 4).

  As shown schematically in FIG. 5, the one-way wheel 26 accommodated in the barrel 18 may be a wide, short cylindrical shape whose inner diameter is slightly larger than the diameter of the pivot 14 and whose outer diameter is the barrel. Is approximately equal to the inner diameter of 18. On the outer peripheral wall of the one-way wheel 26, axial grooves 28 are provided at equal intervals in the circumferential direction. When the one-way wheel is stored in the barrel 18, each groove 28 is fitted to the protrusion 24 on the inner periphery of the barrel. As a result, the one-way wheel 26 is stopped in the barrel 18. Although three one-way wheels 26 are stored for each barrel 18 in FIG. 3, it is also possible to determine the length so that two or four or more barrels can be stored. If the hinge mechanism 1 does not require a large load capacity, the number of one-way wheels 26 may be reduced and the plastic wheel 30 (FIG. 6) having substantially the same shape may be stored in place of the one-way wheel 26.

  The one-way wheel 26 is also referred to as a one-way clutch, and is a device in which the inner ring, that is, the pivot 14 can be rotated only in one direction by a plurality of small rollers 32 arranged around the one-way wheel 26. The one-way wheel 26 includes, for example, eight cylindrical small rollers 32 that contact the periphery of the pivot 14, and an outer ring 34 that has a relatively deep wedge-shaped recess that accommodates each of the small rollers 32. A shallow groove portion and a deep groove portion are formed in the recess 36. In the one-way wheel 26, 5 to 12 small rollers 32 are usually arranged at equal intervals in the circumferential direction. In the one-way wheel 26, a part of the small roller 32 protrudes slightly inward from the inner peripheral surface of the cylindrical cage 38. In the one-way wheel 26, an elastic member such as a leaf spring 40 or a coil spring urges each small roller 32 toward the shallow groove portion of the recess 36.

  When the pivot 14 rotates in the direction D of FIG. 5 or the outer ring 34, that is, the barrel 18 rotates in the direction C, each roller 32 moves in the direction of biting into the shallow groove while rotating clockwise in FIG. . When each roller 32 is in pressure contact with the inner peripheral surface of the shallow groove portion and the outer peripheral surface of the pivot 14, it does not rotate and stops. At this time, torque is transmitted between the outer ring 34 and the pivot 14 via the roller 32, and the one-way wheel 26 enters a locked state that restricts relative rotation between the pivot 14 and the outer ring 34. On the other hand, when the pivot 14 rotates clockwise (counter D direction) in FIG. 5 or the outer ring 34 rotates counterclockwise (counter C direction) in FIG. 5, each roller 32 rotates counterclockwise in FIG. It moves in the direction of the deep groove while rotating. The gap between the inner peripheral surface of the deep groove portion and the outer peripheral surface of the pivot 14 is larger than the outer diameter of each roller 32 and is maintained at that position by the leaf spring 40, so that each roller 32 continues to rotate. At this time, torque is not transmitted between the outer ring 34 and the pivot 14, and the one-way wheel 26 enters a free state that allows relative rotation between the pivot 14 and the outer ring 34.

  After accommodating the one-way wheel 26 or the plastic wheel 30 in each barrel 18, a washer 42 (FIG. 2) is further fitted to both ends of the pivot, and the center hole of the washer is fitted to the deformed end 44 of the pivot 14. , Hit the pivot end to stop it. The diameter of the disk-shaped washer 42 is slightly larger than the inner diameter of the barrel 18 and is substantially equal to the inner diameter of the circumferential groove at the barrel end. The washer 42 can be fixed to a snap ring such as an E ring by groove formation, welding, or screwing.

  The central leaf portion 12 used in the present invention is a rectangular plane as shown in FIG. 2, has a horizontally long side shape as shown in FIG. 7, and a pair of horizontal penetrations through which parallel pivots 14 and 16 pass. Holes 20 and 20 are provided. The front and rear walls of the central leaf portion 12 are composed of an upper vertical wall 46 and a lower quarter circumferential wall 48, and the lower wall 49 needs to be flat and horizontal. The quarter-circumferential walls 48, 48 are essential for allowing the central leaf portion 12 to pivot about the pivot 14 or 16. For example, one of the vertical walls 46, 46 comes into contact with the surface 84 of the movable top plate 5, so that the movable top plate is stationary at the half-open position (see FIG. 10 (2)), and the other is the fixed top plate 7. By making contact with the surface 86, the movable top 5 is stopped at the fully open position (see FIG. 10 (3)). Therefore, the vertical distance from the vertical wall 46 to the center of the pivot 14 needs to be equal to the vertical distance from the surface of the movable top plate 5 or the fixed top plate 7 to the center of the pivot 14. Further, the lower wall 49 comes into contact with the surface 86 of the fixed top plate 7 so that the movable top plate 5 is stopped at the half open position when the movable top plate 5 is closed from the fully open position as shown in FIG. Is necessary to make the movable top plate 5 stand still in the fully closed position when the movable top plate 5 is closed.

  The through hole 20 of the central leaf portion 12 has a cylindrical shape in which a key groove 50 is formed in the axial direction on the circular inner peripheral surface, and a chamfered portion 52 is formed on the leaf portion side wall. The plastic brake cylinders 54 and 56 shown in FIGS. 8 and 9 include a flange portion 58 and a cylindrical portion 60. The outer diameter of the cylindrical portion is substantially equal to the diameter of the through hole 20, and the inner diameter of the cylindrical portion is not It is slightly smaller than the diameter of the pivot 16 in the press-fitted state. Since the brake cylinders 54 and 56 are made of, for example, wear-resistant polyacetal, they can be used for a long time. When the brake cylinders 54 and 56 are respectively stored in the through holes 20 from both side walls of the central leaf portion 12, the key protrusions 62 provided in the axial direction on the outer peripheral wall engage with the key grooves 50 of the through holes 20 to be stationary. In addition, when the lower corner portion 64 of the flange portion 58 is in close contact with the chamfered portion 52, the brake cylinders 54 and 56 are completely fitted into the through hole 20 except for the flange portion 58.

  The cylindrical portions 60 of the brake cylinders 54 and 56 may have different lengths as shown in FIGS. 8 and 9, respectively, or both may have the same length. The combined length of the cylindrical portion 60 of the brake cylinder 54 and the cylindrical portion 60 of the brake cylinder 56 is usually shorter than the distance of the through hole 20 of the central leaf portion 12 (see FIG. 2). It may be determined almost the same. Instead of the brake cylinders 54 and 56, it is possible to use one cylindrical body and two independent flanges. When the brake cylinders 54 and 56 are accommodated in the through holes 20, the flange portion 58 is interposed between the central leaf portion 12 and the barrel 18 of the attachment leaf portions 8 and 10, and the central leaf portion 12 and the attachment leaf portion 8. , 10 to reduce frictional resistance during mutual rotation.

  When both brake cylinders 54 and 56 are stationaryly stored in the through holes 20 from both side walls of the central leaf portion 12, and the pivot 14 or 16 is press-fitted through the brake cylinders 54 and 56, the pivots can be rotated by braking. I can support it. The brake cylinders 54 and 56 are each provided with a key protrusion 62 provided in the axial direction on the outer peripheral wall of the brake cylinder so as not to idle together with the pivot 14 or 16. Such a detent may be a plurality of grooves in the peripheral wall formed in the one-way ring 26, or its outer peripheral surface may be a non-circular plane such as an ellipse or a rectangle, or may be integrated with an adhesive. The stopping method is the same for the one-way wheel 26.

  The attachment leaf portions 8 and 10 are attached to the movable main body 5 and the fixed main body 7, respectively, and both rotate freely in the same rotational direction, but they are arranged to face each other and thus freely rotate in the opposite direction (see FIG. 10). . In this case, the free rotation means that it can be freely rotated as in the prior art without being braked. 10 and 11, the F direction and B direction on the left side of the drawing mean the rotation direction of the attachment leaf portion 8, that is, the movable top plate 5 with respect to the central leaf portion 12, and the F direction and B direction on the right side of the drawing are The rotation direction of the central leaf portion 12 relative to the attachment leaf portion 10, that is, the fixed top plate 7 is meant.

  The hinge mechanism 1 according to the present invention is generally attached to the movable top plate 5 and the fixed top plate 7 of the flip-up counter 3 shown in FIG. 3 in convenience stores, commercial dining kitchens, snack bars, and the like. However, it is not limited to such use. For example, if the material strength, dimensions, etc. are changed, it can be applied to the lid of an underground storage or the lid of a manhole.

  As shown in FIG. 12, the one-way braking hinge mechanism 70 according to the present invention has two leaf portions 72 and 74 that are pivotable with respect to each other. The both leaf portions are integrated by penetrating through the central barrel 80 of the other leaf portion 74. One leaf portion 72 has substantially the same structure as the attachment leaf portion 8 shown in FIG. 4, that is, a one-way wheel (not shown) is stationaryly stored in both barrels 78, 78 of the one leaf portion 72. The pivot 76 is supported so as to be rotatable in one direction via the one-way wheel.

  On the other hand, the other leaf portion 74 has a T-shaped planar shape as shown in FIG. 13, and a horizontal through hole 82 is provided in the central barrel 80. The through hole 82 of the central barrel 80 is substantially the same as the through hole 20 (FIG. 7) of the central leaf portion 12 described above. A plastic brake cylinder (not shown) similar to that shown in FIGS. 8 and 9 is housed stationary in the central barrel 80, and the pivot 76 is press-fitted through the brake cylinder to enable braking rotation.

  The leaf portions 72 and 74 perform a braking rotation in a direction in which both are opened and a free rotation in a direction in which the leaf portions 72 and 74 are closed. The leaf portions 72 and 74 can pivot around the pivot 76, and the rotation of the pivot 76 is braked in the opening direction by the plastic braking member. As a result, when the hinge mechanism 70 for one-way braking is attached to the outside of an opening / closing member such as a horizontal lid, for example, the upward rotation for opening the lid is achieved without resistance, and the lid closes. Therefore, it is possible to effectively brake when turning downward.

  Next, the present invention will be described based on examples, but the present invention is not limited to the examples. The hinge mechanism 1 shown in FIG. 1 is a flip-up counter 3 disposed on a long counter 2 (FIG. 3). One attachment leaf portion 8 is attached to the movable top plate 5 and the other attachment leaf portion 10 is fixed. Mounted on the top plate 7, the flip-up counter can rotate the movable top plate 5 with respect to the fixed top plate 7 until it is fully opened, that is, about 180 degrees (see FIG. 10 (3)). The attachment leaf portions 8 and 10 are usually arranged opposite to each other with the same structure, and freely rotate only in the same one rotation direction, and perform braking rotation in the opposite direction.

  When assembling the hinge mechanism 1, the plastic brake cylinders 54 and 56 are fitted into one of the through holes 20 of the central leaf portion 12, and then the central leaf portion 12 is placed between the barrels 18 and 18 of the one attachment leaf portion 8. After being positioned, the pivot 14 is press-fitted through the brake cylinders 54 and 56. Since the pivot 14 protrudes into both barrels 18, a desired number of one-way wheels 26 are inserted into the pivot ends of each barrel, and washers 42 are fitted to both ends of the pivot, and the washers are crimped to the pivot ends. . Next, the other attachment leaf portion 10 may be assembled in the same manner as described above.

  In the hinge mechanism 1, when the outer ring 34 of the one-way wheel 26 rotates in the C direction of FIG. 5, that is, in the clockwise direction by the rotation of the movable top plate 5, the small roller 32 in each recess 36 also rotates in the clockwise direction. When the roller moves away from the narrow inner wall surface against the elasticity of the leaf spring 40, the outer ring 34 idles around the pivot 14, and the movable top plate 5 can be easily opened upward by free rotation. Further, when turning downward to close the movable top 5, the outer ring 34 rotates counterclockwise in FIG. 5, and the small roller 32 in each recess 36 also rotates counterclockwise. As a result, each small roller 32 bites into the narrow inner wall surface of the recess 36 by the elastic force of the elastic leaf spring 40, rotates the pivot 14 together with the outer ring 34, and suppresses the pivot by the brake cylinders 54, 56. The sudden top turn of the movable top plate 5 is braked, and the movable top plate can be closed gently.

  With respect to the hinge mechanism 1, the full opening / closing operation of the movable top 5 will be described with reference to FIG. In FIG. 10, the movable top plate 5, that is, one of the attachment leaf portions 8, freely rotates in the clockwise F direction as shown on the left side of FIG. Brake and turn. On the other hand, the central leaf portion 12 freely rotates counterclockwise in the F direction as shown on the right side of FIG. 10 with respect to the fixed top plate 7, that is, the other mounting leaf portion 10, and brakes in the clockwise B direction. Rotate.

  In FIG. 10A, one attachment leaf portion 8, that is, the movable top plate 5, is in the fully closed position. When the movable top 5 is opened as shown in FIG. 10 (1) to FIG. 10 (2), the movable top is freely rotated to the half-open position, that is, the 90-degree open position. Can be opened. Even when the movable top plate 5 is released during this free rotation, the movable top plate stops at that position. When the half-open position shown in FIG. 10 (2) is reached, the surface 84 of the movable top plate 5 comes into contact with the left vertical wall 46 of the central leaf portion 12, and the rotation of the attachment leaf portion 8 together with the movable top plate 5 stops. The movable top plate stops at a half-open position.

  When the movable top plate 5 is further opened to FIG. 10 (3), the central leaf portion 12 is braked and rotated in the clockwise B direction of FIG. 10 with respect to the attachment leaf portion 10. For this reason, even if the movable top plate 5 is released from the position shown in FIGS. 10 (2) to 10 (3) or suddenly pushed toward the fixed top plate 7, the movable top plate rotates gently. As a result, there are no finger stuffing accidents. When the movable top 5 turns 180 degrees and reaches the fully open position in FIG. 10 (3), the right vertical wall 46 of the central leaf portion 12 comes into contact with the surface 86 of the fixed top 7 and the movable top 5 stops. To do.

  On the other hand, when the movable top plate 5 is closed from the fully open position of FIG. 10 (3) to the fully closed position of FIG. 10 (1), it passes through FIG. 10 (3) to the half open position of FIG. 10 (2). The central leaf portion 12 can freely rotate in the counterclockwise F direction of FIG. 10 with respect to the attachment leaf portion 10 to lightly open the movable top plate. Even when the movable top plate 5 is released during this free rotation, the movable top plate stops at that position. When the half-open position shown in FIG. 10 (2) is reached, the lower wall 49 of the central leaf portion 12 comes into contact with the surface 86 of the fixed top plate 7, and the rotation of the central leaf portion, that is, the movable top plate 5, stops. The movable top plate stops at an upright position.

  When the movable top plate 5 is continuously closed to the position shown in FIG. 10 (1) through FIG. 10 (2), the central leaf portion 12 remains stationary, and the attachment leaf portion 8 is shown in FIG. The brake rotates in the counterclockwise B direction. For this reason, even if the hand is released from the position of FIG. 10 (2) to FIG. 10 (1) or the movable top 5 is suddenly pushed toward the fixed top 7, the movable top 5 rotates gently. As a result, there are no finger stuffing accidents. When the movable top 5 turns 180 degrees and reaches the fully closed position in FIG. 10 (1), the movable top 5 stops.

  The hinge mechanism 88 shown in FIG. 11 has a configuration in which the braking rotation and free rotation of the attachment leaf portions 8 and 10 are opposite to those of the first embodiment, and actually the plastic leaf cylinder 54 is attached to the attachment leaf portions 8 and 10. Is stored stationary, and a plurality of one-way wheels 30 are stored stationary in the parallel through holes of the central leaf portion 12. With respect to the hinge mechanism 88, the full opening / closing operation of the movable top 5 will be described with reference to FIGS. In FIG. 11, the movable top plate 5, that is, the attachment leaf portion 8, rotates freely in the counterclockwise F direction with respect to the central leaf portion 12 and brakes and rotates in the clockwise B direction. On the other hand, the central leaf portion 12 rotates freely in the clockwise F direction with respect to the attachment leaf portion 10 and brakes and rotates in the B direction counterclockwise.

  When the movable top plate 5 is opened as shown in FIG. 11, the movable top plate rotates freely in the clockwise F direction with respect to the attachment leaf portion 10 together with the central leaf portion 12, and is shown in FIG. 11. It rotates freely to the open position, that is, 90 degree open position. Even when the movable top plate 5 is released during this free rotation, the movable top plate stops at that position. When the half-open position shown in FIG. 11 is reached, the right vertical wall 46 of the center leaf portion 12 comes into contact with the surface 86 of the fixed top plate 7, and the center leaf portion 12 and the movable top plate 5 are stationary at the half-open position.

  When the movable top plate 5 is further opened until FIG. 10 (3), the central leaf portion 12 remains stationary, and the movable top plate 5 brakes in the clockwise B direction of FIG. Move. For this reason, even if the hand is released at the position up to FIG. 10 (3), the movable top 5 is gently rotated downward. When the movable top 5 turns 180 degrees and reaches the fully open position in FIG. 10 (3), the surface 84 of the movable top 5 comes into contact with the left vertical wall 46 of the central leaf portion 12, and the movable top 5 stops. To do.

  On the other hand, when the movable top 5 is closed from the fully opened position in FIG. 10 (3), the movable top 5 is counterclockwise F in FIG. The movable top plate can be lightly opened by rotating freely in the direction. When the half-open position shown in FIG. 11 is reached, the surface 84 of the movable top plate 5 comes into contact with the lower wall 49 of the central leaf portion 12, and the rotation of the movable top plate 5 stops with respect to the central leaf portion 12. The top plate stops at the half-open position.

  When the movable top plate 5 continues to be closed to the position shown in FIG. 10A through FIG. 11, the central leaf portion 12 is braked and rotated in the counterclockwise B direction of FIG. The top plate 5 turns together with the central leaf portion 12. For this reason, since the movable top plate 5 rotates gently, a finger jamming accident does not occur. When the movable top plate 5 turns 180 degrees and reaches the fully closed position of FIG. 10A, the lower wall 49 of the central leaf portion 12 comes into contact with the surface 86 of the fixed top plate 7, and the central leaf portion 12 and the movable top plate are moved. The plate 5 stops.

  The hinge mechanism 88 is functionally the same as the hinge mechanism 1 of the first embodiment. However, when the movable top plate 5 is opened 90 degrees, the movable top plate of the same length is opened because the rest position is different. The width is slightly larger. For this reason, in the case of a relatively short movable top plate, the hinge mechanism 88 is more convenient than the hinge mechanism 1.

  FIG. 12 shows another modification of the present invention. A one-way braking hinge mechanism 70 has two leaf portions 72 and 74 that are pivotable with respect to each other, and a pivot 76 is a barrel 78 of one leaf portion 72. And penetrates through the central barrel 80 of the other leaf portion 74. One leaf portion 72 has substantially the same structure as the attachment leaf portion 8 described above. On the other hand, the shape of the other leaf portion 74 is a T-shaped plane as shown in FIG. 13, and a through hole 82 is provided in the central barrel 80. The through hole 82 of the central barrel 80 is substantially the same as the through hole 20 of the central leaf portion 12.

  The leaf portions 72 and 74 rotate the pivot 76 in the opening direction and idle in the closing direction. The leaf portions 72 and 74 can pivot around the pivot 76, and the rotation of the pivot 76 is braked in the opening direction by the plastic braking member. As a result, when the hinge mechanism 70 for one-way braking is attached to the outside of a relatively heavy lid such as a horizontal open / close lid of a large copier or a back lid of a piano, it resists rotation of the lid in the opening direction. It is possible to achieve braking and effectively brake when the lid is rotated in the closing direction.

DESCRIPTION OF SYMBOLS 1 Hinge mechanism 3 Bounce counter 5 Movable top plate 7 Fixed top plate 8,10 Mounting leaf part 12 Central leaf part 14,16 Pivot 18 Mounting leaf part barrel 20 Central leaf part through-hole 26 One-way wheel 30 Plastic wheel 54, 56 Plastic braking cylinder

Claims (5)

  The three leaf portions having three leaf portions that can pivot with respect to each other, and the two parallel pivots respectively penetrate through the barrels of the two attachment leaf portions and the through holes of the central leaf portion. The one-way wheel is stationaryly accommodated in the barrels of the two mounting leaf parts, and each pivot is supported so as to be rotatable in one direction via the one-way wheel, while the central leaf part is penetrated. A hinge mechanism that holds a plastic brake cylinder stationaryly in a hole and supports the two pivots by press-fitting the brake cylinder so as to enable braking rotation, and has one attachment leaf attached to the movable body, And by attaching the other mounting leaf part to the fixed body, when the movable body is turned from the fully closed state, it freely rotates at any of the mounting leaf parts, and when it is half open, one side of the central leaf part The hinge mechanism but leaf portion with said mounting in contact with the body surface at rest, for braking rotation to full open more by the central leaf portion through another mounting leaf portion of the Continuing the turning of the movable body. The central leaf portion is a rectangular flat rectangular plate body, and the plastic braking cylinder or the one-way wheel is stored stationary in two through holes formed close to each other along the side of the central leaf portion, The hinge mechanism according to claim 1, wherein the left side of the central leaf portion is in contact with the surface of the flat movable top plate or the right side thereof is in contact with the surface of the flat fixed top plate in the half open state of the movable body. .   2. The hinge mechanism according to claim 1, wherein the two attachment leaf portions are attached to adjacent surfaces of the fixed and movable top plates of the flip-up counter.   The plastic braking cylinder includes a cylindrical body with a flange that is housed in a through hole from a barrel side wall of the central leaf portion or the two attachment leaf portions, and an axial protrusion of the cylindrical body. The hinge mechanism according to claim 1, wherein the hinge mechanism is stationary in the through hole by interposition and effectively brakes the press-fitted pivot.   The one-way wheel that is stationaryly accommodated in the barrels of the two attachment leaf parts or in the central leaf part can adjust the load resistance of the hinge mechanism by increasing or decreasing the number of accommodations in the barrel, The hinge mechanism according to claim 1, wherein a plastic ring having substantially the same shape as the one-way wheel is disposed in a space generated by reducing the number of the one-way wheels stored.

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