Quick-opening type mistaken-closing-preventing safety door catch and system

Abstract

The utility model discloses a quick-opening type mistaken-closing-preventing safety door catch and a system. The utility model discloses a quick-opening type mistakenly-closing-preventing safety door catch and system. The quick-opening type mistakenly-closing-preventing safety door catch comprises a shell, a limiting bolt, a door bolt, a reset spring and an operating handle. The shell comprises a hollow cavity. At least part of the limiting bolt extends into the cavity of the shell; the door bolt comprises a bolt body and a spring bolt, the bolt body and the limiting bolt are oppositely arranged, at least part of the bolt body extends into the cavity of the shell, and the spring bolt is connected with the bolt body and protrudes out of the shell. The two ends of the reset spring are elastically connected with the limiting bolt and the bolt body respectively. The operating handle is connected with the hydrant body. Through a pure mechanical structure, the device is lower in cost, simpler in structure and suitable for being applied to low-investment and severe working condition scenes. When the door is opened, the safety door extrudes the spring bolt, the spring bolt compresses the spring, the safety door can be quickly opened, and the passing efficiency is improved; when the door is continuously opened, the safety door cannot reversely extrude the spring bolt, and the spring bolt can prevent wrong closing; after safety is confirmed, the operator can normally close the door through the operation handle.

Description

Technical Field

[0001] This utility model relates to the field of safety protection technology, specifically to a quick-opening anti-accidental closing safety latch and system. Background Art

[0002] Some machine tool equipment uses safety barriers or shielded rooms in their work areas to isolate workers from potential hazards during operation. When equipment needs adjustment or maintenance, workers access the work area through safety doors. To protect personal safety, safety doors need safety switches to detect their open / closed status, as well as latches to lock them, or electronic safety door locks with open / closed status detection. Safety doors also need to have anti-accidental closure features to prevent accidental reset of the safety door while workers are operating in hazardous areas, thus protecting their safety from equipment malfunctions.

[0003] Problems with conventional door latches and electronic safety locks: When opening the door, both conventional door latches and electronic safety locks require an additional unlocking action, resulting in lower passage efficiency; after the safety door is opened, conventional door latches do not prevent accidental closure if the operator does not manually reset them intentionally or unintentionally; electronic safety locks can prevent accidental closure from triggering safety signals. However, electronic safety locks are expensive and complex in structure, making them unsuitable for low-investment scenarios and harsh environments.

[0004] In summary, existing security door locks suffer from technical problems such as low passage efficiency, lack of anti-accidental closing function, and high cost. Utility Model Content

[0005] The purpose of this application is to overcome the above-mentioned technical deficiencies and propose a quick-opening anti-accidental closing safety latch and system to solve the technical problems of low passage efficiency, lack of anti-accidental closing function and high cost in the prior art.

[0006] To achieve the above-mentioned technical objectives, this application adopts the following technical solution:

[0007] In a first aspect, this application provides a quick-opening, anti-accidental-closing safety latch, including a housing, a limit bolt, a latch, a return spring, and an operating handle:

[0008] A housing, the housing comprising a hollow cavity;

[0009] A limiting bolt, wherein the limiting bolt extends at least partially into the cavity of the housing;

[0010] A door bolt, comprising a bolt body and a latch, wherein the bolt body is disposed opposite to the limiting bolt and at least partially extends into the cavity of the housing, and the latch is connected to the bolt body and protrudes from the housing;

[0011] A return spring, the two ends of which are elastically connected to the limiting bolt and the bolt body, respectively;

[0012] An operating handle is connected to the bolt body.

[0013] In some embodiments of this application, the limiting bolt includes a nut and a screw, the first end of the housing has a screw hole, the screw passes through the screw hole, and the nut is connected to the screw and located outside the housing.

[0014] In some embodiments of this application, the second end of the housing has an opening, the first end is disposed opposite to the second end, the bolt passes through the opening, and the latch has a beveled tongue.

[0015] In some embodiments of this application, the bolt body has a slot on the side facing the limiting bolt, one end of the return spring is sleeved around the screw, and the other end of the return spring is embedded in the slot of the bolt body.

[0016] In some embodiments of this application, the latch is a bevel or an arc, and the width of the latch gradually decreases from the housing outwards.

[0017] In some embodiments of this application, at least one side of the housing has a strip-shaped hole, at least one side of the plug has a mounting hole, and the operating handle passes through the strip-shaped hole and is embedded in the mounting hole.

[0018] In some embodiments of this application, the extension direction of the strip hole is parallel to the extension direction of the bolt.

[0019] In some embodiments of this application, a safety lock is also included. The upper side of the housing has multiple through holes, and the upper side of the bolt has multiple safety holes. The through holes and the safety holes correspond one-to-one, and each safety lock passes through one of the through holes and is embedded in one of the safety holes.

[0020] In some embodiments of this application, a plurality of through holes are spaced apart along the extension direction of the bolt, and a plurality of safety holes are spaced apart along the extension direction of the bolt.

[0021] Secondly, this application also provides a quick-opening anti-misclosing safety system, including a safety door and a quick-opening anti-misclosing safety latch as described in any embodiment of the first aspect, wherein the orthographic projection of the latch tongue of the quick-opening anti-misclosing safety latch covers the safety door.

[0022] Compared with the prior art, the beneficial technical effects of the technical solution provided in this application include:

[0023] This application utilizes a purely mechanical structure, allowing it to operate normally even when the machine tool is powered off. It is less expensive and simpler in structure than electronic safety door locks, making it suitable for low-investment, harsh operating conditions. With an independent safety door signal, when opening the door, the safety door compresses the latch, which in turn compresses the spring, allowing for quick opening without additional unlocking action and improving passage efficiency. During continuous opening, the safety door cannot reversely compress the latch, preventing accidental closure due to wind or other reasons before safety is confirmed, thus protecting the safety of maintenance and adjustment personnel inside the machine tool. Once safety is confirmed, the operator can close the door normally using the operating handle. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in the embodiments will be briefly described below:

[0025] Figure 1 This is a schematic diagram of the structure of a quick-opening anti-accidental closing safety latch provided in an embodiment of this application;

[0026] Figure 2 This is an explosion diagram of a quick-opening anti-mis-closing safety latch provided in an embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the structure of a quick-opening anti-accidental-closing safety system provided in an embodiment of this application.

[0028] Figure label:

[0029] 1. Housing; 2. Limit bolt; 3. Door bolt; 4. Return spring; 5. Operating handle;

[0030] Strip hole 11, through hole 12, bolt body 31, locking tongue 32, mounting hole 33, safety hole 34. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0032] Those skilled in the art will understand that, in this specification, the term "comprising" is an open-ended expression, meaning that the stated feature is present but other features are excluded. Directional terms such as "upper," "lower," "left," and "right" refer to exemplary directions based on the accompanying drawings. Features specified as "first" or "second" implicitly include one or more of that feature. Singular expressions can also be used in plural forms. "Multiple" means two or more. The terms "installed," "connected," and "linked" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection via an intermediate medium, and it can be a connection within two components. Furthermore, "linked" can include wireless connections.

[0033] The purpose of this application is to overcome the above-mentioned technical deficiencies and propose a quick-opening anti-accidental closing safety latch and system to solve the technical problems of low passage efficiency, lack of anti-accidental closing function and high cost in the prior art.

[0034] To achieve the above-mentioned technical objectives, this application adopts the following technical solution:

[0035] Firstly, this application provides a quick-opening, anti-accidental-closing safety latch, such as... Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the structure of a quick-opening anti-accidental closing safety latch provided in an embodiment of this application;

[0036] Figure 2 This is an explosion diagram of a quick-opening, anti-mis-closing safety latch provided in an embodiment of this application.

[0037] A quick-opening, anti-accidental-closing safety latch includes a housing 1, a limiting bolt 2, a bolt 3, a return spring 4, and an operating handle 5.

[0038] Housing 1, the housing 1 comprising a hollow cavity;

[0039] A limiting bolt 2, wherein the limiting bolt 2 extends at least partially into the cavity of the housing 1;

[0040] The bolt 3 includes a bolt body 31 and a latch 32. The bolt body 31 is disposed opposite to the limiting bolt 2 and extends at least partially into the cavity of the housing 1. The latch 32 is connected to the bolt body 31 and protrudes from the housing 1.

[0041] The return spring 4 has two ends that are elastically connected to the limiting bolt 2 and the bolt body 31, respectively.

[0042] Operating handle 5, which is connected to the bolt body 31.

[0043] This application utilizes a purely mechanical structure, allowing it to operate normally even when the machine tool is powered off. It is lower in cost and simpler in structure than electronic safety door locks, making it suitable for low-investment, harsh operating conditions. With an independent safety door signal, when opening the door, the safety door presses the latch 32, which in turn compresses the spring, allowing for quick opening without additional unlocking action and improving passage efficiency. During continuous opening, the safety door cannot reversely press the latch 32, preventing accidental closure due to wind or accidental contact before safety is confirmed, thus protecting the safety of maintenance and adjustment personnel inside the machine tool. Once safety is confirmed, the operator can close the door normally using the operating handle 5.

[0044] In some embodiments of this application, the limiting bolt 2 includes a nut and a screw, the first end of the housing 1 has a screw hole, the screw passes through the screw hole, and the nut is connected to the screw and located outside the housing 1.

[0045] The screw of the limiting bolt 2 passes through the threaded hole at the first end of the housing 1, and the nut is connected to the screw and located outside the housing 1. By rotating the nut, the position of the limiting bolt 2 inside the housing 1 can be adjusted, that is, the length of the bolt extending into the cavity of the housing 1 can be adjusted. After rotating to the appropriate position, the limiting bolt 2 is fixed to ensure that it will not be displaced by external force.

[0046] One end of the return spring 4 is connected to the limit bolt 2, and the other end is connected to the bolt body 31 of the door bolt 3. When the safety door presses against the latch 32, the latch 32 pushes the bolt body 31 to compress the return spring 4, causing the door bolt 3 to move closer to the limit bolt 2, thereby opening the safety door.

[0047] The design of the nut and screw allows for easy adjustment of the position of the limit bolt 2 to accommodate doors of different thicknesses or various installation requirements. The nut, fixed to the outside of the housing 1, effectively prevents the limit bolt 2 from loosening, enhancing the stability of the entire safety latch system.

[0048] In some embodiments of this application, the second end of the housing 1 has an opening, the first end is disposed opposite to the second end, the bolt 31 passes through the opening, and the locking tongue 32 has a slanted tongue.

[0049] The second end of the housing 1 has an opening, through which the bolt 31 can pass. Thus, one end of the bolt 3 is located inside the housing 1, while the other end (with the latch 32) is located outside the housing 1 and in contact with the safety door.

[0050] The latch 32 has a beveled design. When the safety door is opened, the beveled effect causes the latch 32 to be pushed by the edge of the safety door. The latch 32 drives the return spring 4 into a compressed state, the safety door latch retracts, and the safety door opens quickly.

[0051] When the safety door needs to be opened, simply push or pull the safety door. The latch will be pushed out to the locking position by the action of the door edge. At the same time, the return spring 4 will be compressed, and the bolt 3 will move outward, thus opening the safety door.

[0052] The beveled latch design simplifies the latch structure, making it easier to manufacture and install. The beveled latch enables quick opening without complex unlocking actions, improving operational convenience. It effectively prevents accidental closure when the safety door is open, ensuring the safety of workers. The beveled latch design can accommodate safety doors of varying thicknesses, offering a degree of versatility.

[0053] In some embodiments of this application, the bolt body 31 has a slot on the side facing the limiting bolt 2, one end of the return spring 4 is sleeved around the screw, and the other end of the return spring 4 is embedded in the slot of the bolt body 31.

[0054] Because the beveled surface of the latch faces the closed position of the safety door, when the safety door remains open, the right-angled surface of the latch faces the door. At this time, under the elastic force of the return spring 4, the latch 32 returns from the compressed state to the normal state, and the latch 32 extends outward. If the safety door rotates towards the safety latch due to wind or accidental contact, it will come into contact with the right-angled surface of the latch 32, preventing the return spring 4 from being compressed and avoiding accidental closure without confirmation of safety.

[0055] When the operator confirms that it is safe and needs to close the safety door, the bolt 3 can be retracted by operating the handle 5. The latch will not interfere with the safety door during rotation when it is retracted, thus successfully closing the safety door.

[0056] One end of the return spring 4 is fitted around the threaded rod of the limit bolt 2, and the other end is embedded in the slot of the bolt body 31. The limit bolt 2 and the bolt body 31 limit the return spring 4. The return spring 4 acts directly on the bolt body 31, providing a stable restoring force and ensuring the reliability of the door latch during opening and closing. The return spring 4 connects the limit bolt 2 and the door latch 3, providing an elastic restoring force to the door latch 3. The design of the return spring 4 ensures that the door latch 3 will not be accidentally reset due to external force when the safety door is opened, thereby preventing the safety door from closing accidentally.

[0057] In some embodiments of this application, the latch is a bevel or an arc, and the width of the latch 32 gradually decreases from the housing 1 outwards.

[0058] The bolt is designed with a bevel or curved surface on the front, and the back of the bolt is flush with the bolt body 31. The front of the bolt faces the closed position of the safety door, and the back of the bolt faces the fully open position of the safety door. This shape helps the edge of the safety door to gradually press the bolt 32 along the bevel or curved surface during the opening process. Specifically, at this time, the force of the safety door on the bolt 32 is inclined to the extension direction of the bolt body 31. According to the force decomposition, the inclined force can be decomposed into a force parallel to the bolt body 31. The bolt 32 drives the bolt body 31 to compress the return spring 4, so that the safety door latch is in a compressed state. The safety door is no longer subjected to the force perpendicular to the bolt body 31, thus allowing the door to open smoothly.

[0059] The width of the latch 32 gradually decreases from the housing 1 outwards. This design allows the latch 32 to more easily enter the compressed state when subjected to external force, thereby opening the door quickly without affecting passage efficiency.

[0060] After the safety door is fully opened, during the closing process, it will first contact the right-angled edge of the latch 32. The force of the safety door on the latch 32 is perpendicular to the bolt 31, and there is no force component in the parallel direction of the bolt 31. The safety bolt cannot move, thus preventing the safety door from closing accidentally. At this time, the operator needs to manually unlock the door by operating the handle 5 and compress the return spring 4 to close the door smoothly.

[0061] The beveled or curved design allows the latch to enter the compressed state more smoothly when opened, reducing operating force and improving the user experience. The beveled tongue design can better withstand impacts; even if the security door is hit by an external force, the beveled tongue can remain extended to protect the safety of personnel and equipment inside.

[0062] In some embodiments of this application, at least one side of the housing 1 has a strip-shaped hole 11, at least one side of the bolt 31 has a mounting hole 33, and the operating handle 5 passes through the strip-shaped hole 11 and is embedded in the mounting hole 33.

[0063] In some embodiments of this application, the extending direction of the strip hole 11 is parallel to the extending direction of the bolt 3.

[0064] The operating handle 5 is designed to pass through the strip hole 11 of the housing 1 and be embedded in the mounting hole 33 of the bolt body 31. In this way, the operating handle 5 is directly connected to the bolt 3, allowing the user to control the movement of the bolt 3 by operating the handle 5.

[0065] When it is necessary to close the safety door, the user can pull the operating handle 5 to manually compress the return spring 4, so as to avoid the locking tongue 32 interfering with the safety door and thus close the safety door latch.

[0066] The extension direction of the strip hole 11 is parallel to the extension direction of the bolt 3. This design ensures that the operating handle 5 can move smoothly during operation without generating unnecessary lateral force, thus improving the accuracy and convenience of operation.

[0067] The design of the operating handle 5 allows users to easily open and close the security door, improving operational convenience. The parallel design of the strip hole 11 and the bolt 3 reduces lateral forces during operation, making the bolt more stable during opening and closing. By directly mounting the operating handle 5 onto the bolt 3, additional parts and space requirements are reduced, resulting in a more compact overall structure.

[0068] In some embodiments of this application, a safety lock is also included. The upper side of the housing 1 has a plurality of through holes 12, and the upper side of the bolt body 31 has a plurality of safety holes 34. The through holes 12 and the safety holes 34 correspond one-to-one, and each safety lock passes through one of the through holes 12 and is embedded in one of the safety holes 34.

[0069] In some embodiments of this application, a plurality of through holes 12 are spaced apart along the extension direction of the bolt 3, and a plurality of safety holes 34 are spaced apart along the extension direction of the bolt 3.

[0070] The safety lock is inserted into the safety hole 34 on the upper side of the bolt body 31 through the through hole 12 on the upper side of the housing 1. This design allows the safety lock to secure the bolt body 31 and prevent unauthorized operation.

[0071] When the safety door needs to remain open or to prevent unauthorized closure, the safety lock can be activated to fix the bolt 31, thereby preventing relative movement between the bolt 31 and the housing 1.

[0072] Each safety lock corresponds to a specific through hole 12 and safety hole 34, allowing multiple safety locks to be suspended.

[0073] The addition of a security lock provides an extra layer of security, preventing unauthorized access and operation. Multiple security locks can be installed as needed to accommodate different security requirements and access permissions.

[0074] Secondly, this application also provides a quick-opening anti-accidental-closing safety system, such as... Figure 3 As shown, Figure 3 This is a schematic diagram of the structure of a quick-opening anti-accidental-closing safety system provided in an embodiment of this application.

[0075] A quick-opening anti-misclosing safety system includes a safety door and a quick-opening anti-misclosing safety latch as described in any embodiment of the first aspect, wherein the orthographic projection of the latch 32 of the quick-opening anti-misclosing safety latch covers the safety door.

[0076] The bolt 3 is installed inside the housing 1 and locked and its position adjusted by the hexagonal limiting bolt 2. The return spring 4 keeps the bolt 3 in the extended state. When the door is opened directly, the edge of the safety door touches the inclined surface of the bolt 3, and the bolt 3 automatically retracts without manual operation. When the safety door is closed uncontrollably, the edge of the door is blocked by the right-angled surface of the bolt 3, realizing the function of preventing accidental closing. The operating handle 5 passes through the elongated hole of the housing 1 and is installed on the screw hole of the bolt 3. When closing the door normally, pulling the operating handle 5 will retract the bolt 3, and the door can be closed normally. The housing 1 and the bolt 3 have mounting holes 33 for the operating handle 5 in the four directions of top, bottom, inside and outside, so the installation direction can be selected according to the scenario. The bolt 3 and the housing have lock holes aligned with the housing for hanging safety locks. When the operator is adjusting and maintaining the equipment, multiple safety locks can be hung to prevent accidental operation by other personnel and protect the safety of the operator.

[0077] The bolt 3 is installed inside the housing 1 and is locked and positioned by the hexagonal socket head cap screw 2. The return spring 4 keeps the bolt 3 in the extended position, ready to interact with the security door.

[0078] When the safety door is opened, the door edge contacts the inclined surface of the door bolt 3. Due to the action of the return spring 4, the door bolt 3 will automatically retract without manual operation, thus achieving quick door opening.

[0079] If the safety door attempts to close uncontrollably, the door edge will be blocked by the right-angled surface of the bolt 3, preventing the bolt 3 from being squeezed back, thereby preventing the safety door from closing accidentally.

[0080] When the door needs to be closed normally, the user can pull the operating handle 5 to retract the bolt 3, thereby removing the obstruction to the safety door, and then the safety door can be closed normally.

[0081] The housing 1 and the bolt 3 are provided with mounting holes 33 for the operating handle 5 in the four directions of top, bottom, inside and outside, so that the installation direction of the operating handle 5 can be selected according to the specific use scenario.

[0082] The bolt 3 has aligned locking holes with the outer casing for hanging safety locks. Multiple safety locks can be hung during equipment maintenance to prevent accidental operation by other personnel and ensure the safety of workers.

[0083] The automatically retracting bolt 3 and the simple operating handle 5 design make opening and closing the door more convenient and faster. The anti-accidental closing function and the suspended design of the safety lock significantly improve operational safety. The multi-directional mounting holes 33 of the operating handle 5 allow the bolt to adapt to different installation needs and environments.

[0084] With an independent safety door signal, the safety latch of this application does not require additional latch release action when opening the door, allowing for rapid opening and improved passage efficiency. The mechanical structure of the safety latch ensures normal operation even when the machine tool is powered off. It prevents the safety door from closing incorrectly due to wind or accidental contact without prior safety confirmation, protecting the safety of maintenance and adjustment personnel inside the machine tool. The safety latch can hold multiple safety locks, facilitating cross-checking of area safety when multiple people are working. The operating handle 5 has multiple installation directions, allowing the safety latch to be installed and applied inside or outside the door, as well as in confined spaces. It is lower in cost and simpler in structure than electronic safety door locks, making it suitable for low-investment, harsh working conditions.

[0085] Compared with the prior art, the beneficial technical effects of the technical solution provided in this application include:

[0086] This application utilizes a purely mechanical structure, allowing it to operate normally even when the machine tool is powered off. It is lower in cost and simpler in structure than electronic safety door locks, making it suitable for low-investment, harsh operating conditions. With an independent safety door signal, when opening the door, the safety door presses the latch 32, which in turn compresses the spring, allowing for quick opening without additional unlocking action and improving passage efficiency. During continuous opening, the safety door cannot reversely press the latch 32, preventing accidental closure due to wind or accidental contact before safety is confirmed, thus protecting the safety of maintenance and adjustment personnel inside the machine tool. Once safety is confirmed, the operator can close the door normally using the operating handle 5.

[0087] Those skilled in the art will understand that the steps, measures, and schemes in the various operations, methods, processes, and procedures discussed in this application can be alternated, modified, rearranged, decomposed, combined, or deleted.

[0088] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Any other corresponding changes and modifications made based on the technical concept of this application should be included within the scope of protection of the claims of this application.

Claims

1. A quick-opening, anti-accidental-closing safety latch, characterized in that, include: A housing, the housing comprising a hollow cavity; A limiting bolt, wherein the limiting bolt extends at least partially into the cavity of the housing; A door bolt, comprising a bolt body and a latch, wherein the bolt body is disposed opposite to the limiting bolt and at least partially extends into the cavity of the housing, and the latch is connected to the bolt body and protrudes from the housing; A return spring, the two ends of which are elastically connected to the limiting bolt and the bolt body, respectively; An operating handle is connected to the bolt body.

2. The quick-opening anti-accidental closing safety latch according to claim 1, characterized in that, The limiting bolt includes a nut and a screw rod. The first end of the housing has a screw hole, the screw rod passes through the screw hole, and the nut is connected to the screw rod and located outside the housing.

3. The quick-opening anti-accidental closing safety latch according to claim 2, characterized in that, The second end of the housing has an opening, the first end is disposed opposite to the second end, the bolt passes through the opening, and the locking tongue has a slanted tongue.

4. The quick-opening anti-accidental closing safety latch according to claim 3, characterized in that, The bolt body has a slot on the side facing the limiting bolt, one end of the return spring is sleeved around the screw, and the other end of the return spring is embedded in the slot of the bolt body.

5. A quick-opening, anti-accidental closing safety latch according to claim 3, characterized in that, The latch is inclined or curved, and the width of the latch gradually decreases from the housing outwards.

6. A quick-opening, anti-accidental closing safety latch according to claim 1, characterized in that, The housing has a strip-shaped hole on at least one side, the bolt has a mounting hole on at least one side, and the operating handle passes through the strip-shaped hole and is embedded in the mounting hole.

7. A quick-opening, anti-accidental closing safety latch according to claim 6, characterized in that, The extension direction of the strip hole is parallel to the extension direction of the bolt.

8. A quick-opening, anti-accidental closing safety latch according to claim 1, characterized in that, It also includes a safety lock. The upper side of the housing has multiple through holes, and the upper side of the bolt has multiple safety holes. The through holes and the safety holes correspond one-to-one, and each safety lock passes through one of the through holes and is embedded in one of the safety holes.

9. A quick-opening, anti-accidental closing safety latch according to claim 8, characterized in that, The plurality of through holes are spaced apart along the extension direction of the bolt, and the plurality of safety holes are spaced apart along the extension direction of the bolt.

10. A quick-opening anti-accidental-closing safety system, characterized in that, It includes a safety door and a quick-opening anti-misclosing safety latch as described in any one of claims 1 to 9, wherein the orthogonal projection of the latch tongue of the quick-opening anti-misclosing safety latch covers the safety door.

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