A kind of impact-resistant structure for protective door latch

Abstract

The present invention relates to an anti-impact structure for a protective door latch, which comprises a door leaf, a latch mechanism is vertically arranged on the rear side of the door leaf, the latch mechanism comprises an electric push rod, a connecting rod is upwardly connected to the electric push rod, an upper latch is connected to the upper end of the connecting rod, an upper latch guard is arranged at a position corresponding to the upper latch, a top wall is arranged above the latch guard, the upper latch guard is arranged close to the top wall, the top surface of the upper latch guard is an inclined wedge surface, and an anti-shear block is arranged on the lower side of the upper latch guard. The present invention provides an anti-impact structure for a protective door latch, wherein the upper latch guard is arranged close to the top wall, and when the door leaf is impacted, the upper latch guard is abutted against the top wall, thereby preventing the door leaf from sliding upward and causing damage to hinges, bearings and other components, and effectively ensuring the service life of the protective door.

Description

Technical Field

[0001] The invention relates to an anti-impact structure of a latch for a protective door, belonging to the technical field of protective doors. Background Art

[0002] A protective door is a door that can withstand various shock waves or heavy objects, and is generally made of steel. The threshold mechanism of a protective door is divided into a fixed threshold, a movable threshold, and a drop-down threshold. Fixed thresholds are cheaper, but are inconvenient for people and vehicles to enter and exit; movable thresholds can be installed when needed to provide protection and sealing functions. Existing movable threshold protective doors usually use a flip-up form to achieve switching between threshold states, but when the existing flip-up threshold is impacted in the forward direction, the threshold will flip upward and become ineffective.

[0003] The invention patent with application number 202021353792.8 discloses a flip-type movable threshold impact-resistant protective door, which includes a wall, a door opening is opened on the wall, a door leaf is arranged at the position of the door opening, the door leaf is hinged to the wall, a pit is arranged below the door opening, and a flip-type movable threshold is arranged in the pit. When the door leaf is closed, the movable threshold can be flipped up, and its front baffle is against the door leaf, and the rear baffle is against the limit baffle, so as to improve the impact resistance of the door leaf. However, in the actual use of the above patent, it was found that when the front of the door leaf is impacted, the upward reaction force of the threshold is very large, which is much greater than the dead weight of the door leaf, so it will drive the door leaf to slide upward, and it is easy to cause damage to the door leaf hinges, bearings and other components during the falling process of the door leaf, thereby affecting the service life of the protective door. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an anti-impact structure for a protective door latch in response to the above-mentioned prior art, wherein an upper latch guard seat is arranged close to the top wall. When the door leaf is impacted, the upper latch guard seat is against the top wall, thereby preventing the door leaf from sliding upward and causing damage to components such as hinges and bearings, thereby effectively ensuring the service life of the protective door.

[0005] The technical solution adopted by the present invention to solve the above-mentioned problem is: a protective door latch anti-impact structure, which includes a door leaf, a latch mechanism is vertically arranged on the rear side of the door leaf, the latch mechanism includes an upper latch, an upper latch guard seat is arranged at the corresponding position of the upper latch, a top wall is arranged above the latch guard seat, the upper latch guard seat is arranged close to the top wall, the top surface of the upper latch guard seat is an inclined wedge surface, and an anti-shear block is arranged on the lower side of the upper latch guard seat.

[0006] Optionally, the gap between the upper latch guard and the top wall is 2mm~4mm.

[0007] Optionally, the gap between the upper latch guard and the top wall is 1 cm to 3 cm.

[0008] Optionally, a wedging plate is provided between the upper latch guard and the top wall.

[0009] Optionally, there are multiple latch mechanisms, and the multiple latch mechanisms are arranged at intervals on the left and right, and wedging plates are only provided on some of the latch mechanisms.

[0010] Optionally, the lower side surface of the wedging plate is also an inclined wedge surface, and the top surface of the upper latch guard seat and the lower side surface of the wedging plate are wedged with each other.

[0011] Optionally, two left and right swing arms are provided on the upper latch pin guard seat, the middle part of the swing arm is hinged to the upper latch pin guard seat through a first pin shaft, the wedge plate is connected and arranged between the upper ends of the left and right swing arms, a limiting slide groove is provided at the lower part of the swing arm, a connecting seat is provided on the rear side of the upper latch, two limiting pins are symmetrically arranged on the connecting seat, and the left and right limiting pins are respectively inserted in the left and right limiting slide grooves.

[0012] Optionally, the left and right sides of the wedging plate are hinged to the upper ends of the left and right swing arms through second pin shafts respectively, and connecting arms are downwardly arranged on the left and right sides of the wedging plate, and the second pin shaft is passed through the lower end of the connecting arm, and a pin hole is opened at the upper end of the swing arm, and the second pin shaft is inserted into the pin hole, and the pin hole is an oblong hole.

[0013] Optionally, the swing arm includes an upper swing arm and a lower swing arm, and the first pin shaft is arranged at the connection position between the upper swing arm and the lower swing arm; the lower swing arm includes an upper inclined section, a middle straight section and a lower inclined section connected in sequence, the upper inclined section is inclined toward the front side, and the lower inclined section is inclined toward the rear side, and the limiting slide groove extends from the middle straight section to the lower inclined section.

[0014] Optionally, a connecting rod is connected to the lower end of the upper latch pin, and the connecting rod includes an upper straight section, an intermediate connecting section and a lower straight section. The lower end of the upper straight section is hinged to the upper end of the intermediate connecting section, the lower end of the intermediate connecting section is hinged to the upper end of the lower straight section, and the lower end of the lower straight section is connected to the electric push rod.

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] The upper latch pin guard of the present invention is arranged close to the top wall, and the top surface of the upper latch pin guard is an inclined wedge surface. When the front of the door leaf is impacted, the door leaf will bend to a certain extent, so that the top inclined wedge surface of the upper latch pin guard is just against the top wall, thereby preventing the door leaf from sliding upward and causing damage to the hinge, bearing and other components, and effectively ensuring the service life of the protective door;

[0017] The lower side of the upper latch guard of the present invention is provided with a shear block, which can increase the force limit of the upper latch guard, and prevent the upper latch guard from being subjected to excessive force, causing slippage between the upper latch guard and the door leaf, and the bolts from being sheared and damaged (when the front of the door leaf is impacted, the upward force of the door leaf is very large, which cannot be borne by the friction between the upper latch guard and the door leaf alone);

[0018] A wedging plate can also be arranged between the upper latch guard and the top wall of the present invention, so as to fill the gap between the upper latch guard and the top wall, thereby preventing the door leaf from sliding upward when impacted, thereby damaging the hinge, bearing and other components, and effectively ensuring the service life of the protective door;

[0019] The wedging plate of the present invention is linked with the latch mechanism. When the latch moves upward, the wedging plate is driven to insert into the gap between the latch guard and the top wall. When the latch moves downward, the wedging plate is driven to withdraw from the gap between the upper latch guard and the top wall, thereby realizing automatic wedging of the wedging plate.

[0020] When the latch of the present invention moves downward, the wedging plate withdraws from the gap between the upper latch guard and the top wall, and will not affect the normal opening and closing of the door leaf. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of an anti-impact structure of a protective door latch according to the present invention.

[0022] Figure 2 for Figure 1 Enlarged view of part A.

[0023] Figure 3 This is a schematic diagram of the status after the upper latch is inserted into the top wall.

[0024] Figure 4 for Figure 3 Enlarged view of part B.

[0025] Figure 5 Schematic diagram of the process of inserting the upper latch into the top wall.

[0026] Figure 6 for Figure 5 Enlarged view of part C.

[0027] Figure 7 This is a schematic diagram of the state when the upper latch is not inserted into the top wall.

[0028] Figure 8 for Figure 7 Enlarged view of part D.

[0029] in:

[0030] Door 1

[0031] Top wall 2

[0032] Latch mechanism 3

[0033] Electric linear actuator 31

[0034] Extension rod 32

[0035] Upper short straight section 321

[0036] Intermediate connecting section 322

[0037] Lower long straight section 323

[0038] Upper latch 33

[0039] Upper latch guard 34

[0040] Swing arm 35

[0041] Upper swing arm 351

[0042] Lower arm 352

[0043] Upper inclined section 352.1

[0044] Middle straight section 352.2

[0045] Lower inclined section 352.3

[0046] First pin 36

[0047] Limiting chute 37

[0048] Connecting seat 38

[0049] Limit pin 39

[0050] Pin hole 310

[0051] Wedging plate 4

[0052] Second pin 5

[0053] Connecting arm 6

[0054] Shear block 7. DETAILED DESCRIPTION

[0055] The present invention is further described in detail below with reference to the accompanying drawings.

[0056] See also Figure 1 to Figure 8The present invention relates to a protective door latch anti-impact structure, which comprises a door leaf 1, a latch mechanism 3 is vertically arranged at the rear side of the door leaf 1, the latch mechanism 3 comprises an electric push rod 31, the electric push rod 31 is upwardly connected with a connecting rod 32, an upper latch 33 is connected to the upper end of the connecting rod 32, an upper latch seat 34 is arranged at a position corresponding to the upper latch 33, a top wall 2 is arranged above the latch seat 34, the upper latch seat 34 is arranged close to the top wall 2, the top surface of the upper latch seat 34 is an inclined wedge surface, and an anti-shear block 7 is arranged at the lower side of the upper latch seat 34;

[0057] The gap between the upper latch guard 34 and the top wall 2 is 2mm~4mm. When the front of the door leaf is impacted, it will bend to a certain extent. At this time, the top inclined wedge surface of the upper latch guard 34 directly contacts the top wall 2 to prevent the door leaf from sliding upward. The shear block 7 on the lower side of the upper latch guard 34 assists in bearing force to prevent the upper latch guard 34 from slipping and the bolts from being damaged by shear.

[0058] When the gap between the upper latch guard 34 and the top wall 2 is large (1 cm to 3 cm), a wedging plate 4 may be provided between the upper latch guard 34 and the top wall 2 to fill the gap between the upper latch guard 34 and the top wall 2, thereby preventing the front of the door leaf from sliding upward due to impact;

[0059] There are multiple latch mechanisms 3, which are arranged at intervals on the left and right, and the above effect can be achieved by only providing wedging plates 4 on some of the latch mechanisms 3;

[0060] The lower side of the wedging plate 4 is also an inclined wedge surface, and the top surface of the upper latch guard 34 and the lower side of the wedging plate 4 are wedged with each other;

[0061] The upper side of the wedging plate 4 is a plane, and the upper side of the wedging plate 4 abuts against the top wall 2;

[0062] The upper latch guard 34 is provided with two left and right swing arms 35, the middle part of the swing arm 35 is hinged to the upper latch guard 34 through a first pin shaft 36, the wedging plate 4 is connected and arranged between the upper ends of the left and right swing arms 35, the lower part of the swing arm 35 is provided with a limited sliding groove 37, the rear side of the upper latch 33 is provided with a connecting seat 38, the connecting seat 38 is symmetrically provided with two limit pins 39, and the left and right limit pins 39 are respectively inserted into the left and right limit sliding grooves 37;

[0063] The left and right sides of the wedging plate 4 are respectively hinged to the upper ends of the left and right swing arms 35 through the second pin shaft 5;

[0064] The left and right sides of the wedging plate 4 are downwardly provided with connecting arms 6, and the second pin shaft 5 is installed on the lower end of the connecting arm 6;

[0065] A pin hole 310 is provided at the upper end of the swing arm 35, and the second pin shaft 5 is inserted into the pin hole 310;

[0066] The pin hole 310 is an oblong hole, thereby providing a certain degree of up and down floating margin for the wedging plate 4;

[0067] The swing arm 35 includes an upper swing arm 351 and a lower swing arm 352, and the first pin shaft 36 is disposed at the connection position between the upper swing arm 351 and the lower swing arm 352;

[0068] The lower swing arm 352 comprises an upper inclined section 352.1, a middle straight section 352.2 and a lower inclined section 352.3 connected in sequence, the upper inclined section 352.1 is inclined to the front side, the lower inclined section 352.3 is inclined to the rear side, and the limiting slide groove 37 extends from the middle straight section 352.2 to the lower inclined section 352.3;

[0069] The connecting rod 32 includes an upper straight section 321, an intermediate connecting section 322 and a lower straight section 323. The lower end of the upper straight section 321 is hinged to the upper end of the intermediate connecting section 322, the lower end of the intermediate connecting section 322 is hinged to the upper end of the lower straight section 323, and the lower end of the lower straight section 323 is connected to the electric push rod 31.

[0070] The upper straight section 321 and the lower straight section 323 are arranged in parallel front and back.

[0071] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A protective door latch anti-impact structure, characterized in that: It comprises a door leaf (1), a latch mechanism (3) is vertically arranged on the rear side of the door leaf (1), the latch mechanism (3) comprises an upper latch (33), an upper latch protector (34) is arranged at a position corresponding to the upper latch (33), a top wall (2) is arranged above the upper latch protector (34), the upper latch protector (34) is arranged close to the top wall (2), the top surface of the upper latch protector (34) is an inclined wedge surface, and a shear block (7) is arranged on the lower side of the upper latch protector (34); A wedging plate (4) is provided between the upper latch guard seat (34) and the top wall (2); The lower side surface of the wedging plate (4) is also an inclined wedge surface, and the top surface of the upper latch guard (34) and the lower side surface of the wedging plate (4) are wedged with each other; The upper latch pin guard seat (34) is provided with left and right swing arms (35), the middle part of the swing arm (35) is hinged to the upper latch pin guard seat (34) through a first pin shaft (36), the wedging plate (4) is connected and arranged between the upper ends of the left and right swing arms (35), the lower part of the swing arm (35) is provided with a limit slide groove (37), the rear side of the upper latch pin (33) is provided with a connecting seat (38), the connecting seat (38) is symmetrically provided with two limit pins (39), and the left and right limit pins (39) are respectively inserted into the left and right limit slide grooves (37); The swing arm (35) comprises an upper swing arm (351) and a lower swing arm (352); the first pin shaft (36) is arranged at a connection position between the upper swing arm (351) and the lower swing arm (352); the lower swing arm (352) comprises an upper inclined section (352.1), a middle straight section (352.2) and a lower inclined section (352.3) connected in sequence; the upper inclined section (352.1) is inclined toward the front side, the lower inclined section (352.3) is inclined toward the rear side, and the limiting sliding groove (37) extends from the middle straight section (352.2) to the lower inclined section (352.3).

2. The impact-resistant structure of a protective door latch according to claim 1, characterized in that: The gap between the upper latch pin guard (34) and the top wall (2) is 2 mm to 4 mm.

3. The impact-resistant structure of a protective door latch according to claim 1, characterized in that: The gap between the upper latch pin guard (34) and the top wall (2) is 1 cm to 3 cm.

4. The impact-resistant structure of a protective door latch according to claim 1, characterized in that: There are a plurality of latch mechanisms (3), which are arranged at intervals on the left and right, and only some of the latch mechanisms (3) are provided with wedging plates (4).

5. The impact-resistant structure of a protective door latch according to claim 1, characterized in that: The left and right sides of the wedging plate (4) are respectively hinged to the upper ends of the left and right swing arms (35) through second pin shafts (5). Connecting arms (6) are arranged downwardly on the left and right sides of the wedging plate (4). The second pin shaft (5) is inserted through the lower ends of the connecting arms (6). A pin hole (310) is provided at the upper end of the swing arm (35). The second pin shaft (5) is inserted into the pin hole (310). The pin hole (310) is an oblong hole.

6. The impact-resistant structure of a protective door latch according to claim 1, characterized in that: The lower end of the upper latch pin (33) is connected to a connecting rod (32), the connecting rod (32) comprising an upper straight section (321), an intermediate connecting section (322) and a lower straight section (323), the lower end of the upper straight section (321) being hinged to the upper end of the intermediate connecting section (322), the lower end of the intermediate connecting section (322) being hinged to the upper end of the lower straight section (323), and the lower end of the lower straight section (323) being connected to the electric push rod (31).

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