Box door hinge capable of automatically resetting and closing

Abstract

A box door hinge capable of being automatically reset and closed comprises a main body, a containing groove is formed in the main body, a hook is hinged in the containing groove through a first hinged shaft to swing, a pull rod is further installed in the main body, and one end of the pull rod is hinged and linked with the hook through a second hinged shaft; the other end of the pull rod is connected with a movable rod, the cylindrical surface of the movable rod is connected with a tension spring, the other end of the tension spring is connected with the main body, a locking groove is concavely formed in the end surface of one side, facing the pull rod, of the hook, the inner side of the locking groove protrudes out of the hook body to form a guide table, and the guide table and the locking groove are in arc transition; a driving pulley and a driving shifting fork connected with the tail of the driving pulley are further embedded in the body, the tail of the driving shifting fork is connected with a compressed spring, and the compressed spring generates thrust to push the driving shifting fork to move towards the locking groove.

Description

TECHNICAL FIELD

[0001] The utility model relates to a box door hinge shaft, specifically an automatic reset closing box door hinge. BACKGROUND

[0002] Household appliances such as ovens, microwave ovens are to put food to be cooked into the box body internal cooking space, and the food is heated and cooked by closing and sealing the box body through the door body. In the prior art, the door body is often connected through a hinge, and the door body is swung through the hinge to realize the opening and closing operation of the box body.

[0003] The box door hinge on the market relies on the tension provided by the tension spring to realize the closed state of the box door. However, due to the limited tension provided by the tension spring, the locking force is usually weak, which leads to the loosening or even opening of the box door under external vibration or slight tension, and in microwave ovens, ovens and other appliances with high sealing requirements, leakage may occur, affecting the normal use of the appliance and reducing the safety. In order to solve the above-mentioned defects, some manufacturers enhance the tension of the tension spring, which improves the locking force to a certain extent, but with the increase of the tension of the tension spring, the closing speed of the box door is also significantly increased, which may cause rapid impact between the box door and the appliance body, and is not conducive to the protection of the box door and the appliance. The rapid closing of the box door also causes high noise. SUMMARY

[0004] The utility model aims at overcoming the shortcomings of the prior art, and provides an automatic reset closing box door hinge which has the advantages of simple structure, low manufacturing cost, automatic reset closing of the box door, stable and reliable closing process, stable and firm locking, effective avoidance of impact or noise, high safety and ideal sealing performance.

[0005] The utility model aims at overcoming the shortcomings of the prior art, and provides an automatic reset closing box door hinge which has the advantages of simple structure, low manufacturing cost, automatic reset closing of the box door, stable and reliable closing process, stable and firm locking, effective avoidance of impact or noise, high safety and ideal sealing performance.

[0006] The side end face of the hook towards the pull rod is concave and provided with a locking groove, and a guide table is formed on the inner side of the locking groove protruding from the hook body, and the guide table and the locking groove are connected through a circular arc;

[0007] The main body is internally embedded with a driving pulley and a driving yoke connected to the tail of the driving pulley, the driving yoke is connected with a compression spring, the compression spring generates a pushing force to push the driving yoke to move towards the locking groove, and drive the driving pulley to be clamped in the locking groove.

[0008] The side wall of the main body is provided with a movable slot, and a movable rod is clamped in the movable slot and slides along the movable slot.

[0009] The movable slot is in the shape of a long waist.

[0010] The side wall of the main body is provided with a limiting slot, and the rotating shaft of the driving pulley is clamped in the limiting slot to limit the sliding track of the driving pulley in the limiting slot.

[0011] The limiting slot is in the shape of a long waist.

[0012] The driving yoke comprises a yoke head in the shape of "Y" and a holder at one end of the yoke head, the end of the yoke head is recessed to provide a driving slot, and the driving pulley is installed in the driving slot through the rotating shaft.

[0013] The tail of the holder is inserted into the connecting table of the main body, the compression spring is sleeved outside the holder, one end of the compression spring is pressed against the yoke head, the other end is pressed against the connecting table, the compression spring generates a pushing force to push the driving pulley to always move towards the locking groove through the yoke.

[0014] The locking groove is in the shape of a circular arc; the outer end of the guide table is inclined and provided with a guide surface, and the guide surface and the locking groove are connected through a circular arc.

[0015] The hook is hingedly connected with a stop piece through a third hinge shaft.

[0016] The utility model discloses the beneficial effect is: 1, simple structure, low manufacturing cost, improve market competitiveness.

[0017] Through the mutual cooperation of the compression spring and the tension spring, the method is different from the traditional single spring tension to realize the closing of the box door, buffer force is provided for the closing of the box door, the problem of rapid impact of the box door or noise caused by the too large tension of the tension spring is avoided, the service life of the box door and the equipment body is effectively protected.

[0018] Improve the sealing and closing performance of the equipment, high safety, high equipment thermal efficiency. DRAWINGS

[0019] Figure 1 It is the general assembly effect diagram of the utility model.

[0020] Figure 2 It is the internal structure schematic view of the box door hinge shaft in the utility model.

[0021] Figure 3 It is the section view of the hinge shaft of the box door in the utility model.

[0022] Figure 4 It is the structure schematic diagram of the hinge shaft of the hidden main body in the utility model.

[0023] Figure 5 It is the structure schematic diagram of the hook in the utility model.

[0024] Figure 6 It is the structure assembly drawing of the driving pulley and driving fork in the utility model. DETAILED DESCRIPTION

[0025] The utility model discloses an automatic reset closing box door hinge, which comprises a main body 1, a containing groove 11 is arranged in the main body 1, a hook 2 is hinged in the containing groove 11 to swing through a first hinge shaft 31, a pull rod 5 is also installed in the main body 1, one end of the pull rod 5 is hinged and linked with the hook 2 through a second hinge shaft 32, the other end of the pull rod 5 is connected with a movable rod 51, the movable rod 51 is connected with a tension spring 52 in a cylindrical surface, the other end of the tension spring 52 is connected with the main body 1, the tension spring 52 always generates a pulling force to push the pull rod 5 to retract, so that the hook 2 is forced to retract to a closed position.

[0026] One side end face of the hook 2 is concave and provided with a locking groove 21, a guide table 22 is formed on the inner side of the locking groove 21, and the guide table 22 and the locking groove 21 are connected through a circular arc.

[0027] The main body 1 is also embedded with a driving pulley 6 and a driving fork 7 connected with the tail of the driving pulley 6, the tail of the driving fork 7 is connected with a compression spring 8, the compression spring 8 generates a pushing force to push the driving fork 7 to move towards the locking groove 21, and drives the driving pulley 6 to be clamped in the locking groove 21.

[0028] The side wall of the main body 1 is provided with a movable groove 12, the movable rod 51 is clamped in the movable groove 12, and the movable rod 51 slides along the movable groove 12.

[0029] The movable groove 12 is long-waisted.

[0030] The side wall of the main body 1 is provided with a limiting groove 13, the rotating shaft 61 of the driving pulley 6 is clamped in the limiting groove 13, and the sliding track of the driving pulley 6 in the limiting groove 13 is limited.

[0031] The limiting groove 13 is long-waisted.

[0032] The driving shift fork 7 comprises a fork head 71 in the shape of "Y" and a holder 72 at one end of the fork head 71, and the end of the fork head 71 is provided with a driving groove 711 in which the driving pulley 6 is installed through the rotating shaft 61.

[0033] The tail of the holder 72 is inserted into the connecting table 14 of the main body 1, and the compression spring 8 is sleeved outside the holder 72, one end of the compression spring 8 abuts against the fork head 71, and the other end abuts against the connecting table 14, the compression spring 8 generates a pushing force, and the driving pulley 6 is always moved to the direction of the locking groove 21 through the fork.

[0034] The locking groove 21 is in the shape of a circular arc, and the outer end of the guide table 22 is inclined and provided with a guide surface, and the guide surface and the locking groove 21 are connected through a circular arc.

[0035] The hook 2 is hingedly connected with the stop piece 4 through the third hinge shaft 33.

[0036] Working principle: when the box door is opened, the hook swings downward in the accommodating groove through the first hinge shaft, and the pull rod is linked and swung through the second hinge shaft. An active lever is connected to the other end of the pull rod, and the pull spring hook is connected to the cylindrical surface of the active lever; at the same time, the other end of the pull spring is connected with the main body. When the box door starts to open, the pull spring is passively stretched, and always generates a retracting force, which is temporarily stored.

[0037] The driving pulley and the driving shift fork for pushing the driving pulley are also embedded in the main body. During the opening of the box door, the hook synchronously pushes the driving pulley to the end of the driving shift fork, the compression spring sleeved on the holder of the driving shift fork is passively compressed, forcing the driving pulley to separate from the locking groove of the hook, and sliding along the guide table of the hook. After the door body is opened, the hook rotates, and the driving pulley is connected with the guide surface of the guide table.

[0038] The active slot and the limiting slot are respectively formed in the main body, the active lever is inserted and clamped in the active slot, and the rotating shaft of the driving pulley is inserted and clamped in the limiting slot, so as to limit and guide the movement track of the pull rod and the driving pulley, ensure the accurate movement of the pull rod and the driving pulley, and avoid the problems such as misalignment of the box door when closing, and ensure the normal closing of the box door.

[0039] The mutual cooperation of the compression spring and the pull spring is ingeniously utilized, the hook and the pulley realize mutual coordination movement, the contact forced friction between the mutual parts is avoided, and the opening operation of the box door is more smooth and labor-saving.

[0040] When the box door is closed, the external pulling force of the user on the box door is cancelled, the retracting pulling force of the tension spring is released, the tension spring drives the hook to swing back around the first rotating shaft through the interconnection of the movable rod and the pull rod, the hook gradually resets to the original position, and the closing of the box door is realized.

[0041] The driving pulley and the locking groove form a mechanical locking structure, the locking is stable and firm, the situation of insufficient locking force caused by the traditional locking relying on the tension spring alone is avoided, in the case of external vibration or slight pulling force, the box door will not be loose or opened, and the sealing and safety of the box door are significantly improved.

[0042] Further, the locking groove is in the shape of a circular arc, and the circular arc is used to transition between the locking groove and the guide table, the guide surface of the guide table can guide the movement track of the driving pulley, so that the hook and the driving pulley can be smoothly and quickly and accurately closed and locked, and the closing effect of the box door is improved.

[0043] In the case, through the cooperation of the compression spring and the tension spring, unlike the traditional method of closing the box door by using a single spring pulling force, not only does the method provide a buffer force for the closing of the box door, but also avoids the problems of rapid impact of the box door caused by excessive pulling force of the tension spring or noise, effectively protects the box door and the equipment body, prolongs the service life, further improves the sealing and closing performance of the equipment, has high safety, and has high equipment thermal efficiency.

[0044] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the utility model, and the utility model can have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed.

Claims

1. An auto-resetting closed box door hinge, comprising a main body (1) in which a receiving groove (11) is arranged, and a hook (2) is hinged in the receiving groove (11) to swing through a first hinge shaft (31), characterized in that: A pull rod (5) is also installed in the main body (1), one end of the pull rod (5) is hingedly connected with the hook (2) through a second hinge shaft (32), the other end of the pull rod (5) is connected with a movable rod (51), the movable rod (51) is connected with a pull spring (52) in a cylindrical manner, the other end of the pull spring (52) is connected with the main body (1), the pull spring (52) always generates a pulling force to push the pull rod (5) to retract, so as to force the hook (2) to retract to the closed position; The end face of the hook (2) on the side of the pull rod (5) is concave and is provided with a locking groove (21), the inner side of the locking groove (21) protrudes from the body of the hook (2) and forms a guide table (22), the guide table (22) and the locking groove (21) are transitioned through an arc; The main body (1) is also embedded with a drive pulley (6) and a drive yoke (7) connected to the tail of the drive pulley (6), the tail of the drive yoke (7) is connected with a compression spring (8), the compression spring (8) generates a pushing force to push the drive yoke (7) to move towards the locking groove (21) and drive the drive pulley (6) to be clamped in the locking groove (21).

2. An auto-resetting closed box door hinge according to claim 1, characterized in that: The side wall of the main body (1) is provided with a movable slot (12) extending therethrough, the movable rod (51) is clamped in the movable slot (12), and the movable rod (51) slides along the movable slot (12).

3. An auto-resetting closed box door hinge according to claim 2, characterized in that: The movable slot (12) is long-waisted.

4. An auto-resetting closed box door hinge according to claim 1, characterized in that: The side wall of the main body (1) is provided with a limiting slot (13) extending therethrough, the rotating shaft (61) of the drive pulley (6) is clamped in the limiting slot (13), and the sliding track of the drive pulley (6) in the limiting slot (13) is limited.

5. An auto-resetting closed box door hinge according to claim 4, characterized in that: The limiting slot (13) is long-waisted.

6. An automatic closing and resetting box door hinge according to claim 1, characterized in that: The drive yoke (7) comprises a yoke head (71) in the shape of "Y" and a holder (72) at one end of the yoke head (71), the end of the yoke head (71) is concave and is provided with a drive groove (711), and the drive pulley (6) is installed in the drive groove (711) through the rotating shaft (61).

7. An auto-resetting closed box door hinge according to claim 6, characterized in that: The tail of the holder (72) is inserted into the connecting table (14) of the main body (1), the compression spring (8) is sleeved outside the holder (72), one end of the compression spring (8) abuts against the yoke head (71), the other end abuts against the connecting table (14), the compression spring (8) generates a pushing force to always push the drive pulley (6) to move towards the locking groove (21) through the yoke.

8. An automatic closing and resetting box door hinge according to claim 1, characterized in that: The locking groove (21) is in the shape of an arc; the outer end of the guide table (22) is inclined and is provided with a guide surface, and the guide surface and the locking groove (21) are transitioned through an arc.

9. An automatic closing and resetting box door hinge according to claim 1, characterized in that: The hook (2) is hingedly connected with a stop piece (4) through a third hinge shaft (33).

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