Anti-disengagement structure for paper bin cover and door opening rod of printer

Abstract

The utility model discloses an anti-disengaging structure of a paper bin cover and a door opening rod of a printer, the anti-disengaging structure comprises a limiting piece and the door opening rod, the limiting piece comprises a fixing part, a clamping part and a rail part, a round hole with an opening is formed in one end, away from the paper bin cover, of the fixing part, the clamping part is arranged at the opening of the round hole, and the rail part is arranged on the fixing part and the clamping part; the door opening rod comprises a round rod, a mounting groove and a boss part are arranged on the round rod, the round rod is rotatably mounted in the round hole, the position of the mounting groove in the round rod corresponds to the clamping part, and the mounting groove and the clamping part are arranged in a staggered mode so that the round rod can be limited by the clamping part to go in and out of the opening. The mounting grooves can rotate to the positions right opposite to the clamping parts so that the clamping parts can release limiting of the circular rod, the boss parts are in sliding connection with the rail parts, the limiting pieces are symmetrically arranged on the paper bin cover, the mounting grooves are symmetrically arranged on the circular rod, and therefore the technical effects that the door opening rod is not prone to disengaging from the paper bin cover, and mounting is convenient are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of printers, and in particular to an anti-detachment structure for a paper bin cover and a door opening rod of a printer. Background Art

[0002] Printers are used across many industries. As printing demands increase, paper rolls are frequently replaced, and the paper cover needs to be frequently opened and closed. Some printers are designed with a dedicated door lever for opening the cover. Therefore, the stability of the door lever is crucial to the proper operation of the printer.

[0003] Currently, some printer door-opening levers are installed by inserting a round rod directly into a circular hole in the paper cover. A notch is provided on the edge of the hole, through which the rod fits, leaving the door-opening lever solely in position. However, this traditional assembly method has several significant drawbacks. If the notch is too large, the door-opening lever can easily become detached from the cover during use, causing the printer to malfunction. If the notch is too small, installation of the door-opening lever becomes difficult or even impossible. Utility Model Content

[0004] To this end, the present application provides an anti-detachment structure for a paper bin cover and a door opening rod of a printer to solve the problem in the prior art that the door opening rod is easily detached from the paper bin cover and difficult to install.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A printer paper bin cover and door opening rod anti-detachment structure, the anti-detachment structure comprising a limiter and a door opening rod, the limiter being provided on the paper bin cover, the door opening rod comprising a circular rod rotatably connected to the limiter;

[0007] The limiting member includes a fixing portion, a locking portion, and a track portion. One end of the fixing portion is provided on the paper bin cover. A circular hole with an opening is provided on the end of the fixing portion away from the paper bin cover. The locking portion is provided at the opening of the circular hole. The track portion is provided on the fixing portion and the locking portion.

[0008] The circular rod is provided with a mounting groove and a boss portion, the boss portion is provided on the side of the mounting groove, the circular rod is rotatably mounted in the circular hole, the position of the mounting groove on the circular rod corresponds to the clamping portion, and the mounting groove and the clamping portion are staggered so that the circular rod cannot pass through the opening under the restriction of the clamping portion, when the circular rod is rotated in the opposite direction, the mounting groove can be rotated to a position facing the clamping portion so that the clamping portion releases the restriction on the circular rod, and the boss portion is slidably connected to the track portion;

[0009] The limiting members are symmetrically arranged on the paper bin cover, and the mounting grooves are symmetrically arranged on the circular rod.

[0010] Optionally, a protruding column is provided on the side of the boss portion facing the track portion, and a track groove is correspondingly provided on the side of the track portion facing the protruding column. The protruding column can be slidably and removably arranged in the track groove, and a circular groove adapted to the top of the protruding column is provided in the track groove.

[0011] Optionally, one end of the paper bin cover is a movable end, the other end of the paper bin cover is rotatably fixed to the printer body, and the anti-detachment structure is provided at the movable end of the paper bin cover.

[0012] Further optionally, the door opening rod includes a door opening wrench, one end of the door opening wrench is fixedly set on one end of the circular rod, and the other end of the door opening wrench is a movable end, the movable end of the door opening wrench is in the same direction as the movable end of the paper bin cover, and the paper bin cover is provided with a notch at one end close to the door opening wrench, and the door opening wrench is arranged in the notch.

[0013] Further optionally, a first limiting rib is provided on the paper bin cover, and a second limiting rib is correspondingly provided on the circular rod. When the door opening wrench is rotated forward to a preset angle, the first limiting rib and the opposite surface of the second limiting rib are abutted against each other.

[0014] Further optionally, a third limiting rib is provided on the limiting member, and a limiting portion is provided on the circular rod, and the limiting portion abuts against the limiting rib to limit the axial movement of the circular rod.

[0015] Further optionally, an anti-deformation groove is provided on the paper bin cover, and the circular rod is rotatably clamped in the anti-deformation groove.

[0016] Further optionally, the door opening rod is provided with a tilting portion, and the tilting portion is provided at both ends of the door opening rod.

[0017] Optionally, the movable end of the door opening wrench is tilted in the direction of the forward rotation of the door opening wrench.

[0018] Compared with the prior art, this application has at least the following beneficial effects:

[0019] The anti-disengagement structure includes a limit piece and a door opening rod, the limit piece includes a fixing part, a locking part and a track part, one end of the fixing part is arranged on the paper bin cover, and a circular hole with an opening is provided at the end of the fixing part away from the paper bin cover, the locking part is arranged at the opening of the circular hole, and the track part is arranged on the fixing part and the locking part, the door opening rod includes a circular rod, and a mounting groove and a boss part are provided on the circular rod. The circular rod can be rotatably installed in the circular hole, the position of the mounting groove on the circular rod corresponds to the locking part, and the mounting groove and the locking part are staggered so that the circular rod is restricted by the locking part in entering and exiting the opening. When the circular rod rotates in the opposite direction, the mounting groove can be rotated to a position opposite to the locking part so that the locking part releases the limitation of the circular rod, the boss part is slidably connected to the track part, the limit piece is symmetrically arranged on the paper bin cover, and the mounting groove is symmetrically arranged on the circular rod. By setting the locking part at the opening and slidingly connecting the boss part and the track part, the door opening rod is restricted in the round hole. The setting of the installation groove allows the round rod to be inserted into the round hole through the installation groove, which facilitates the installation of the door opening rod, thereby achieving the technical effect of making the door opening rod not easily detached from the paper bin cover and being easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more intuitively illustrate the prior art and the present application, exemplary drawings are provided below. It should be understood that the specific shapes and structures shown in the drawings should not generally be considered as limiting conditions for implementing the present application; for example, based on the technical concepts disclosed in this application and the exemplary drawings, those skilled in the art are capable of easily making routine adjustments or further optimizations to the addition / reduction / attribution division, specific shapes, positional relationships, connection methods, dimensional ratios, etc. of certain units (components).

[0021] Figure 1 A schematic diagram of the first state structure of the anti-detachment structure of the paper bin cover and door opening lever of a printer provided in an embodiment of the present application;

[0022] Figure 2 This is a schematic structural diagram of the door opening rod in the first direction in an embodiment of the present application;

[0023] Figure 3 This is a schematic structural diagram of the door opening rod in the second direction in an embodiment of the present application;

[0024] Figure 4 This is a structural diagram of the paper bin cover in an embodiment of the present application;

[0025] Figure 5 A cross-sectional view of an anti-detachment structure for a paper bin cover and a door opening lever of a printer provided in an embodiment of the present application;

[0026] Figure 6A schematic diagram of the second state structure of the anti-detachment structure of the paper bin cover and door opening lever of a printer provided in an embodiment of the present application;

[0027] Description of reference numerals:

[0028] 1. Paper bin cover; 11. First limiting rib; 12. Second limiting rib; 13. Third limiting rib; 14. Anti-deformation groove; 2. Door opening rod; 3. Limiting piece; 31. Fixing part; 32. Positioning part; 33. Track part; 34. Circular groove; 4. Circular rod; 41. Mounting groove; 42. Boss part; 43. Raised column; 44. Limiting part; 5. Warping part; 6. Door opening wrench. DETAILED DESCRIPTION

[0029] The present application will be further described below in detail through specific embodiments in conjunction with the accompanying drawings.

[0030] A printer usually includes a printer body and a paper compartment cover. One end of the paper compartment cover is rotatably fixed to the printer body, and the other end of the paper compartment cover can be opened and closed from the printer body through a cover opening device. The paper compartment cover can be opened by rotating the door opening rod, but the door opening rod is prone to falling off, which in turn affects the normal opening of the printer cover and thus the normal operation of the printer.

[0031] The utility model aims to provide an anti-separation structure for a paper bin cover and a door opening rod of a printer, so as to solve the technical problems that the door opening rod of the existing printer is easily separated from the paper bin cover and difficult to install.

[0032] refer to Figures 1 to 5 As shown, the utility model provides an anti-detachment structure for the paper bin cover and the door opening rod of a printer, including a limit member 3 and a door opening rod 2, the door opening rod 2 includes a circular rod 4, the circular rod 4 is rotatably connected to the limit member 3, and the limit member 3 is arranged on the paper bin cover 1.

[0033] The limiting member 3 includes a fixing portion 31, a locking portion 32, and a track portion 33. One end of the fixing portion 31 is fixedly mounted on the paper bin cover 1, and a circular hole with an opening is provided at the end of the fixing portion 31 away from the paper bin cover 1. Specifically, the fixing portion 31 is a plate-like structure arranged perpendicularly to the paper bin cover 1, and the circular hole penetrates the thickness direction of the fixing portion 31 (i.e., the circular hole penetrates the thickness of the plate, and the axis of the circular hole is parallel to the paper bin cover 1). The locking portion 32 is arranged at the opening of the circular hole. Specifically, the locking portion 32 is preferably arranged at one end of the opening of the circular hole along the direction in which the circular hole extends. That is, one end of the locking portion 32 is connected to one end of the circular hole, and the other end of the locking portion 32 is an extended end. The locking portion 32 narrows the opening of the circular hole, thereby preventing the circular rod 4 from escaping from the circular hole.

[0034] The track portion 33 is provided on the fixing portion 31 and the locking portion 32 , and one end of the track portion 33 can also be fixed on the paper bin cover 1 .

[0035] The circular rod 4 is provided with a mounting groove 41 and a boss portion 42. The boss portion 42 is arranged on the side of the mounting groove 41. The mounting groove 41 forms a local groove notch on the curved surface of the circular rod 4 and is arranged on the side of the circular rod 4 facing the locking portion 32. The position of the mounting groove 41 on the circular rod 4 corresponds to the locking portion 32. After installation, the mounting groove 41 and the locking portion 32 are staggered. The circular rod 4 is limited by the locking portion 32 and cannot be moved out of the opening. During installation, the circular rod 4 is aligned with the opening of the circular hole, and the mounting groove 41 is aligned with the locking portion 32, that is, the extended end of the locking portion 32 is located in the mounting groove 41. The circular rod 4 is then pressed toward the side of the paper bin cover 1, and the circular rod 4 can be installed into the circular hole without resistance. Subsequently, the circular rod 4 is rotated forward, so that the boss portion 42 slides into the track portion 33. After sliding in, the mounting groove 41 and the locking portion 32 are offset. At this time, the locking portion 32 limits the circular rod 4, preventing the circular rod 4 from falling out of the opening of the circular hole. When the circular rod 4 is rotated in the opposite direction, the boss portion 42 slides out of the track portion 33, and the mounting groove 41 can be rotated to a position directly opposite the locking portion 32, so that the locking portion 32 releases the restriction on the circular rod 4, allowing the circular rod 4 to be removed. It should be noted that the forward direction refers to the direction of rotation of the circular rod 4 when the door opening rod 2 is pulled to open the paper bin cover 1, and is also the direction in which the mounting groove 41 rotates away from the opening and thus staggered with the locking portion 32. The reverse direction is the opposite direction to the forward direction, and refers to the direction in which the mounting groove 41 rotates from a position staggered with the locking portion 32 to a position facing the locking portion 32.

[0036] Preferably, the boss portion 42 and the mounting groove 41 are staggered, and the boss portion 42 is slidably connected to the track portion 33. Specifically, a protruding column 43 is provided on the side of the boss portion 42 facing the track portion 33, and a track groove is correspondingly provided on the side of the track portion 33 facing the protruding column 43. The protruding column 43 is slidably and removably arranged in the track groove. When the circular rod 4 is installed in the circular hole, the circular rod 4 is rotated forward so that the protruding column 43 enters the track groove. The circular rod 4 rotates forward in the circular hole, and the protruding column 43 slides in the track groove as the circular rod 4 rotates.

[0037] By the sliding connection between the boss portion 42 and the track portion 33 , the mounting groove 41 and the locking portion 32 are in a misaligned state, so that the round rod 4 can be more firmly confined in the round hole.

[0038] Preferably, a circular groove 34 is provided in the track groove to match the top of the raised column 43. The circular groove 34 is provided at the starting end of the track groove. When the raised column 43 enters the track groove, as the circular rod 4 rotates in the forward direction, the top of the raised column 43 fits into the circular groove 34. The top of the raised column 43 is ball-shaped. When the circular rod 4 is rotated with force, the raised column 43 can be disengaged from the circular groove 34. The circular groove 34 can serve as a limit without affecting the sliding of the raised column 43 in the track groove. At the same time, in the absence of external force, the circular groove 34 serves to limit the forward or reverse rotation of the door opening rod 2.

[0039] Preferably, the limiting member 3 is symmetrically arranged on the paper bin cover 1, and the mounting groove 41 is symmetrically arranged on the circular rod 4. Through the symmetrical arrangement of the limiting member 3 and the mounting groove 41, the door opening rod 2 can be made more stable on the paper bin cover 1.

[0040] By setting the locking portion 32 at the opening and the sliding connection between the boss portion 42 and the track portion 33, the door opening rod 2 is restricted in the round hole, and the setting of the mounting groove 41 allows the round rod 4 to be stuck into the round hole through the mounting groove 41, which facilitates the installation of the door opening rod 2, thereby achieving the technical effect that the door opening rod 2 is not easily detached from the paper bin cover 1 and is easy to install.

[0041] In a preferred embodiment, one end of the paper bin cover 1 is a movable end, and the other end of the paper bin cover 1 is rotatably fixed to the printer body. An anti-detachment structure is provided at the movable end of the paper bin cover 1 to facilitate the opening and closing of the movable end of the paper bin cover 1.

[0042] In a preferred embodiment, the door opening rod 2 includes a door opening wrench 6, one end of the door opening wrench 6 is fixedly set at one end of the circular rod 4, and the other end of the door opening wrench 6 is a movable end. The movable end of the door opening wrench 6 is in the same direction as the movable end of the paper bin cover 1. The paper bin cover 1 is provided with a notch at one end close to the door opening wrench 6, and the door opening wrench 6 is arranged in the notch. Specifically, when the door opening wrench 6 and the paper bin cover 1 are in the same plane, the circular rod 4 is in the circular hole, and the protruding column 43 is in the circular groove 34. The locking portion 32 and the protruding column 43 restrict the circular rod 4 from disengaging from the circular hole. For example, Figure 6 As shown, when the door opening wrench 6 rotates forward, the movable end of the door opening wrench 6 moves away from the paper bin cover 1, the mounting groove 41 rotates forward in the circular hole and continues to move away from the opening, the protruding column 43 disengages from the circular groove 34 and slides toward the tail end of the track groove.

[0043] In a preferred embodiment, a first limiting rib 11 is provided on the paper cover 1, and a corresponding second limiting rib 12 is provided on the circular rod 4. When the door opening lever 6 is rotated forward to a predetermined angle, the opposing surfaces of the first limiting rib 11 and the second limiting rib 12 abut against each other. The predetermined angle refers to the angle of rotation of the circular rod 4 when the raised post 43 slides to the rear end of the track groove. It also refers to the angle of rotation of the circular rod 4 when the movable end of the paper cover 1 is separated from the printer body. At this time, the first limiting rib 11 and the second limiting rib 12 abut against each other, limiting the forward rotation of the door opening lever 2.

[0044] In a preferred embodiment, the limiting member 3 is provided with a third limiting rib 13, and the circular rod 4 is provided with a limiting portion 44. The limiting portion 44 abuts against the third limiting rib 13 to limit the axial movement of the circular rod 4. Specifically, the third limiting rib 13 is integrally provided with the fixing portion 31 and is symmetrically arranged on the paper bin cover 1. The left and right here refer to the axial direction of the circular rod 4. The limiting portions 44 are provided on the left and right sides of the circular rod 4, and the left and right limiting portions 44 are opposite to each other, respectively abutting against the left and right third limiting ribs 13, thereby limiting the axial movement of the door opening rod 2.

[0045] In a preferred embodiment, an anti-deformation groove 14 is provided on the paper bin cover 1. The anti-deformation groove 14 is preferably provided between the symmetrically arranged limit members 3. Multiple anti-deformation grooves 14 can be symmetrically arranged. The circular rod 4 can be rotatably clamped in the anti-deformation groove 14. The anti-deformation groove 14 can prevent the circular rod 4 from deforming.

[0046] In a preferred embodiment, the door opening rod 2 is provided with a tilting portion 5, which is provided at both ends of the door opening rod 2. One end of the tilting portion 5 is fixed to the door opening rod 2, and the other end is a movable end. The movable end of the tilting portion 5 moves in the opposite direction to the movable end of the door opening wrench 6. Figure 6 As shown, when the door opening lever 6 is rotated in the forward direction, the movable end of the door opening lever 6 moves upward, and the movable end of the tilting portion 5 moves downward. When the paper cover 1 is connected to the printer body, the movable end of the tilting portion 5 moves downward, applying force to the printer body, thereby separating the movable end of the paper cover 1 from the printer body. The angle of rotation of the tilting portion 5 at this time is the preset angle for the forward rotation of the door opening lever 6.

[0047] In a preferred embodiment, the movable end of the door opening wrench 6 is tilted in the direction of the positive rotation of the door opening wrench 6, which can facilitate the rotation of the door opening wrench 6.

[0048] The anti-disengagement structure of the paper bin cover and the door opening rod of the printer described in the above embodiment is specifically applied as follows: the process of installing the door opening rod 2 to the limit member 3 is as follows: first, the door opening wrench 6 is rotated downward, that is, rotated in the opposite direction, so that the door opening wrench 6 is located under the paper bin cover 1, and the installation groove 41 is aligned with the extended end of the locking portion 32, that is, one end of the locking portion 32 is placed in the installation groove 41, and then the circular rod 4 is pressed toward one side of the paper bin cover 1, and the circular rod 4 can be installed into the circular hole without resistance, and the extended end of the locking portion 32 disengages the installation groove 41. Subsequently, the circular rod 4 is rotated forward so that the protruding column 43 enters the track groove, and then the protruding column 43 enters the circular groove 34. At this time, the door opening rod is installed, the installation groove 41 and the locking portion 32 are staggered, the locking portion 32 and the protruding column 43 limit the circular rod 4 from entering and exiting the opening, and the door opening wrench 6 is located at the notch position and is on the same plane as the paper bin cover 1. If this state is on the printer body, the paper bin cover 1 is in the closed state. If you want to open the paper bin cover 1, you need to rotate the door opening wrench 6 in the forward direction, that is, pull the door opening wrench 6 upward. At this time, the mounting slot 41 continues to move away from the opening, and the locking portion 32 still restricts the circular rod 4. The circular rod 4 cannot be disengaged from the circular hole. The tilting portion 5 downwardly abuts against the printer body. When the movable end of the paper bin cover 1 is separated from the printer body, the first limiting rib 11 and the second limiting rib 12 abut against each other, and the raised column 43 slides to the end of the track groove. The door opening wrench 6 can no longer continue to rotate forward, but the door opening wrench 6 can continue to be pulled upward. Since the door opening wrench 6 is restricted from rotating, the door opening wrench 6 will drive the movable end of the paper bin cover 1 away from the printer body until the paper bin cover 1 is fully opened. When closing the paper bin cover 1, there is no need to pull the handle. You can directly press the paper bin cover 1 downward until the paper bin cover 1 is buckled onto the printer body. During the entire opening and closing process of the paper bin cover 1, the limiting portion 44 and the third limiting rib 13 are always in contact with each other to limit the axial movement of the circular rod 4. The key point is that since the locking portion 32 and the raised column 43 limit the circular rod 4 from entering and exiting the opening, the installation groove 41 is always located in the round hole, and the circular rod 4 will not detach from the paper bin cover 1, achieving the technical effect of preventing the door opening rod 2 from detaching from the paper bin cover 1 and facilitating installation.

[0049] The technical features of the above embodiments can be combined arbitrarily (as long as there is no contradiction in the combination of these technical features). In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A printer paper cover and door opening rod anti-detachment structure, characterized in that: The anti-disengagement structure comprises a limiter (3) and a door opening rod (2), wherein the limiter (3) is arranged on the paper bin cover (1), and the door opening rod (2) comprises a circular rod (4), and the circular rod (4) is rotatably connected to the limiter (3); The limiting member (3) comprises a fixing portion (31), a locking portion (32) and a track portion (33); one end of the fixing portion (31) is arranged on the paper bin cover (1); an end of the fixing portion (31) away from the paper bin cover (1) is provided with a circular hole with an opening; the locking portion (32) is arranged at the opening of the circular hole; and the track portion (33) is arranged on the fixing portion (31) and the locking portion (32); The circular rod (4) is provided with a mounting groove (41) and a boss portion (42), the boss portion (42) being provided on the side of the mounting groove (41), the circular rod (4) being rotatably mounted in the circular hole, the position of the mounting groove (41) on the circular rod (4) corresponding to the clamping portion (32), and the mounting groove (41) and the clamping portion (32) being staggered so that the circular rod (4) cannot pass through the opening under the restriction of the clamping portion (32), when the circular rod (4) rotates in the opposite direction, the mounting groove (41) can rotate to a position facing the clamping portion (32) so that the clamping portion (32) releases the restriction on the circular rod (4), and the boss portion (42) is slidably connected to the track portion (33); The limiting member (3) is symmetrically arranged on the paper bin cover (1), and the mounting groove (41) is symmetrically arranged on the circular rod (4).

2. The anti-detachment structure of the paper bin cover and the door opening rod of a printer according to claim 1, characterized in that: A protruding column (43) is provided on one side of the boss portion (42) facing the track portion (33), and a track groove is correspondingly provided on one side of the track portion (33) facing the protruding column (43). The protruding column (43) is slidably and detachably arranged in the track groove, and a circular groove (34) adapted to the top end of the protruding column (43) is provided in the track groove.

3. The anti-detachment structure of the paper bin cover and the door opening rod of the printer according to claim 1, characterized in that: One end of the paper bin cover (1) is a movable end, and the other end of the paper bin cover (1) is rotatably fixed on the printer body, and the anti-detachment structure is arranged on the movable end of the paper bin cover (1).

4. The anti-detachment structure of the paper bin cover and the door opening rod of a printer according to claim 3, characterized in that: The door opening rod (2) includes a door opening wrench (6), one end of the door opening wrench (6) is fixedly arranged on one end of the circular rod (4), and the other end of the door opening wrench (6) is a movable end. The movable end of the door opening wrench (6) is in the same direction as the movable end of the paper bin cover (1), and a notch is provided at one end of the paper bin cover (1) close to the door opening wrench (6), and the door opening wrench (6) is arranged in the notch.

5. The anti-detachment structure of the paper bin cover and the door opening rod of a printer according to claim 4, characterized in that: The paper bin cover (1) is provided with a first limiting rib (11), and the circular rod (4) is correspondingly provided with a second limiting rib (12). When the door opening wrench (6) is rotated forward to a preset angle, the first limiting rib (11) and the second limiting rib (12) are opposed to each other.

6. The anti-detachment structure of the paper bin cover and the door opening rod of a printer according to claim 5, characterized in that: A third limiting rib (13) is provided on the limiting member (3), and a limiting portion (44) is provided on the circular rod (4). The limiting portion (44) abuts against the third limiting rib (13) to limit the axial movement of the circular rod (4).

7. The anti-detachment structure of the paper bin cover and the door opening rod of a printer according to claim 6, characterized in that: The paper bin cover (1) is provided with an anti-deformation groove (14), and the circular rod (4) is rotatably clamped in the anti-deformation groove (14).

8. The anti-detachment structure of the paper bin cover and the door opening rod of a printer according to claim 7, characterized in that: The door opening rod (2) is provided with a tilting portion (5), and the tilting portion (5) is provided at both ends of the door opening rod (2).

9. The anti-detachment structure of the paper bin cover and the door opening rod of a printer according to claim 4, characterized in that: The movable end of the door opening wrench (6) is tilted in the direction of the forward rotation of the door opening wrench (6).

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