Construction machinery door lock

Abstract

The engineering machinery door lock of the present invention includes a lock body and a lock catch (2) used in a supporting manner; the lock body includes a plate-shaped mounting bracket (3), a primary lock link mechanism (4), a secondary lock link mechanism (5), a lock tongue assembly (6), and an opening mechanism (7). This engineering machinery door lock has a secondary locking function, can meet the usage requirements of engineering machinery, has a reasonable structure, good reliability, convenient operation, and smooth opening. At the same time, when this engineering machinery door lock is used, the lock catch protrudes less from the door frame, thereby avoiding the problem in the prior art that clothes are cut or scratched when people enter and exit due to the lock catch protruding from the door frame more, and improving the safety of the door lock.

Description

Technical Field

[0001] This application relates to accessories for construction machinery, and specifically to door locks for construction machinery cabs. Background Art

[0002] The door lock on a construction machinery cab is an important component on the door and is required to be safe and reliable. The door locks of existing technologies achieve locking through the cooperation of a latching component inside the lock body and a lock catch installed on the door frame. In the existing technologies, the structure of the lock body determines that the lock catch needs to protrude relatively more from the door frame. When personnel enter and exit the door, they are easily scratched by the protruding lock catch, resulting in damaged clothing or even personal injury, presenting a safety hazard. In addition, for construction machinery door locks, whether the operation is convenient and whether the opening is smooth are also important indicators for measuring their advantages and disadvantages, which directly affect the user experience. Summary of the Invention

[0003] Aiming at the deficiencies of the existing technologies, this application provides a brand-new construction machinery door lock, filling the market gap. This construction machinery door lock has a secondary locking function, can meet the usage requirements of construction machinery, and has a reasonable structure, good reliability, convenient operation, and smooth opening. At the same time, when using this construction machinery door lock, the lock catch protrudes less from the door frame, thus avoiding the problem in the existing technologies that the clothing is cut or scratched when personnel enter and exit due to the lock catch protruding too much from the door frame, improving the safety of the door lock. In addition, this application provides a door lock with a brand-new principle, which can avoid the homogenization competition of similar products and is conducive to promotion.

[0004] This application provides the following technical solutions:

[0005] Construction machinery door lock, which is applicable to the door with an outward-opening design, including a lock body and a lock catch used in combination; the lock body includes a plate-shaped mounting bracket, a primary lock link mechanism, a secondary lock link mechanism, a lock tongue assembly and an opening mechanism; the plate-shaped mounting bracket is provided with a mounting and fixing assembly for fixing it to the door; the primary lock link mechanism includes a primary lock link base, a primary lock rocker and a primary lock link; the bottom end of the primary lock rocker is hinged to the primary lock link base, a long circular hole is provided on the primary lock rocker, and the rear end of the primary lock link is connected to a pin A that can move along the long circular hole in the long circular hole; the secondary lock link mechanism includes a secondary lock link base, a secondary lock rocker and a secondary lock link; the bottom end of the secondary lock rocker is hinged to the secondary lock link base, and the top end of the secondary lock rocker is hinged to the rear end of the secondary lock link; the lock tongue assembly includes a lock tongue, a pin B and a pin C; the lock tongue includes a rocker part and a tongue body provided on the front side of the rocker part; the bottom end of the rocker part is respectively hinged to the primary lock link base and the secondary lock link base through the pin B; the top end of the rocker part is respectively hinged to the front ends of the primary lock link and the secondary lock link through the pin C; the primary lock link base and the secondary lock link base are fixed on the plate-shaped mounting bracket; in the open state, the included angle θ1 between the primary lock rocker and the primary lock link, and the included angle θ2 between the secondary lock rocker and the secondary lock link are both less than 180°; in the primary locking state, the included angle θ1 between the primary lock rocker and the primary lock link is not less than 180°, the pin A is located at the bottom limit position in the long circular hole, the primary lock rocker is restricted from continuing to rotate towards the plate-shaped mounting bracket, and the included angle θ2 between the secondary lock rocker and the secondary lock link is still less than 180°; in the secondary locking state, the included angle θ2 between the secondary lock rocker and the secondary lock link is not less than 180°, and the secondary lock rocker is restricted from continuing to rotate towards the plate-shaped mounting bracket; the tongue body of the lock tongue has a U-shaped groove, wherein the groove side closer to the plate-shaped mounting bracket is longer than the other groove side, and it satisfies that when performing the closing action in the use state, the longer groove side can abut against the lock rod of the lock catch, and the lock tongue is pushed by the lock rod to rotate to the primary locking position and the secondary locking position in sequence; in the locked state, the lock rod of the lock catch is buckled by the U-shaped groove on the tongue body; the opening mechanism includes a guide seat, a 7-shaped opening slider and an opening lever; the guide seat is fixedly arranged on the plate-shaped mounting bracket; the 7-shaped opening slider forms a guiding fit with the guide seat; the bottom end of the 7-shaped opening slider extends out from the hole position on the plate-shaped mounting bracket and is pressed by a compression spring A; the resistance arm of the opening lever is located below the top of the 7-shaped opening slider and can push the 7-shaped opening slider to move towards the top direction; corresponding to the 7-shaped opening slider, a primary lock opening convex head is provided on the inner side surface of the primary lock rocker, and a secondary lock opening convex head is provided on the inner side surface of the secondary lock rocker;The positions of the primary lock opening convex head and the secondary lock convex head satisfy the following requirements: in the primary lock state, the 7-shaped opening slider can be pried toward the top by pushing the power arm of the opening lever, or the 7-shaped opening slider can be pushed toward the top by applying a thrust to the bottom end of the 7-shaped opening slider, thereby lifting the primary lock opening convex head to achieve unlocking; in the secondary lock state, the secondary lock opening convex head can be lifted or the two opening convex heads can be lifted in sequence or simultaneously by pushing the power arm of the opening lever to pry the 7-shaped opening slider toward the top, or the 7-shaped opening slider can be pushed toward the top by applying a thrust to the bottom end of the 7-shaped opening slider, thereby achieving unlocking. ;

[0006] Compared with the prior art, the above-mentioned engineering machinery door lock of the present application has made the following significant progress: it adopts a lock body with a completely new structure, and the primary lock linkage mechanism, the secondary lock linkage mechanism, and the lock tongue assembly are used in conjunction with each other, which is ingeniously designed and novel in structure, can achieve secondary locking, can meet the use requirements of engineering machinery, and has a reasonable structure, good reliability, convenient operation, and smooth opening; at the same time, the engineering machinery door lock adopts the lock body in the scheme of the present application, and when in use, the lock buckle matched with the lock body protrudes less from the door frame, eliminating the hidden danger of scratching or tearing clothes when people enter and exit due to the lock buckle protruding more from the door frame in the prior art, and the safety is improved. In addition, the present application provides a door lock with a completely new principle, which can avoid homogeneous competition among similar products and is conducive to promotion.

[0007] As an optimization, in the aforementioned engineering machinery door lock, the primary lock link includes a primary lock outer link and a primary lock inner link located on both sides of the primary lock rocker; the secondary lock link includes a secondary lock outer link and a secondary lock inner link located on both sides of the secondary lock rocker. With this structural design, the resistance of locking and unlocking is small, and the reliability of the link mechanism is high and the failure rate is low.

[0008] Furthermore, the oblong hole is provided with an A bearing of matching size, and the A pin is assembled in the A bearing; the top end of the secondary lock rocker is provided with a B bearing, and the secondary lock connecting rod is hinged with the secondary lock rocker through the D pin assembled in the B bearing. Thus, the resistance of locking and unlocking is further reduced, and the reliability of the connecting rod mechanism is further improved.

[0009] Furthermore, the A pin extends from the inner side of the primary lock inner connecting rod to form a primary lock opening convex head; the D pin extends from the inner side of the secondary lock inner connecting rod to form a secondary lock opening convex head. In this structure, the extended part of the pin is used as the opening convex head, which is easy to implement and conducive to cost control.

[0010] Further, a primary locking constraint groove is provided on the primary lock link base. After the primary lock rocker reaches the primary locking position, it abuts against the A bearing through the primary locking constraint groove to form a constraint that prevents the primary lock rocker from continuing to rotate towards the plate-shaped mounting bracket. A secondary locking constraint groove is provided on the secondary lock link base. After the secondary lock rocker reaches the secondary locking position, it abuts against the B bearing through the secondary locking constraint groove to form a constraint that prevents the secondary lock rocker from continuing to rotate towards the plate-shaped mounting bracket. With this design, the reliability is good, it is easy to implement, and it is beneficial to control costs.

[0011] As an optimization, in the aforementioned construction machinery door lock, a locking holding spring and an unlocking return spring are provided in the lock body. The locking holding spring applies a force to the primary lock rocker and the secondary lock rocker, and the direction of the torque generated by this force is the same as the rotation direction during the locking process. In the locked state, it is necessary to overcome the elastic force of the locking holding spring to unlock. The unlocking return spring applies a force to the lock tongue, and the direction of the torque generated by this force is opposite to the rotation direction during the locking process. After unlocking, the unlocking return spring drives the lock tongue to rotate in the unlocking direction. Thus, after locking, the locking holding spring presses the rocker to prevent the rocker from being displaced due to vibration and causing automatic unlocking, improving the reliability and safety. After manual unlocking, the unlocking return spring drives the lock tongue to rotate in the unlocking direction, enabling the movement stroke of the 7-shaped opening slider to be designed shorter, which is beneficial to the miniaturized structural design of the product and makes unlocking more convenient and labor-saving.

[0012] Further, both the locking holding spring and the unlocking return spring are torsion springs. Using torsion springs for the locking holding spring and the unlocking return spring ensures reliability and is easy to implement.

[0013] Further, in the process of performing the unlocking action in the secondary locked state, the 7-shaped opening slider sequentially lifts the secondary lock opening convex head and the primary lock opening convex head to achieve unlocking. With this design, the resistance to be overcome during the unlocking process is small, and it has the advantage of labor-saving operation.

[0014] As an optimization, in the aforementioned construction machinery door lock, it further includes an in-door opening component. The in-door opening component includes a lock body cover and an opening button. The lock body cover covers the outside of the lock body and is fixedly arranged relative to the plate-shaped mounting bracket. The tongue body of the lock tongue extends out from an opening near the top of the lock body cover. The opening button forms a guiding fit with the top of the lock body cover to push the power arm of the opening lever to achieve unlocking, and after unlocking, it is reset by a B compression spring. By configuring the above in-door opening component for the lock, the original equipment manufacturer does not need to additionally install an operating component for unlocking on the inner door panel, which is beneficial for promotion.

[0015] Further, an inner handle is provided on the side of the lock body cover, and the inner handle is arranged on the side close to the unlocking button. Thus, the door can be conveniently opened after unlocking, and the usability is good.

[0016] Further, the inner door opening assembly further includes a safety mechanism; the safety mechanism includes a limit support, a safety pin, a safety release handle, and a C compression spring; the limit support is fixedly arranged on the outer side of the lock body cover, the safety pin is in guiding fit with the limit support and its front end extends into the lock body cover through a through hole on the lock body cover, the safety release handle is L-shaped and is hinged to the limit support or the inner handle to form a lever structure, the front end of the safety release handle cooperates with a groove-shaped or hole-shaped structure at the rear of the safety pin, a C compression spring is sleeved on the safety pin, and both ends of the C compression spring abut against the limit support and a step at the front of the safety pin respectively; in the natural state, the front end of the safety pin limits the bottom of the unlocking button so that the unlocking button cannot perform the unlocking operation; when unlocking is required, the safety release handle is pulled to drive the safety pin to move outwards to release the limit on the unlocking button, and at this time, unlocking can be achieved through the unlocking button; after unlocking, the safety release handle is released, and the safety pin resets under the action of the C compression spring and drives the safety release handle to reset. Thus, when unlocking the door from the inner side, it is necessary to unlock the safety through the safety release handle to successfully press the unlocking button to achieve unlocking, avoiding the situation of accidentally pressing the unlocking button by personnel and causing accidental door opening, and the safety is further improved.

[0017] Further, the safety mechanism further includes a limit gate plate arranged in the lock body cover, and the safety pin is in guiding fit with the limit gate plate. By arranging the gate plate, the stability of the safety pin can be improved, thereby improving the reliability, reducing the failure rate, and having a long service life.

[0018] As an optimization, in the aforementioned construction machinery door lock, a cable opening assembly is further included; the cable opening assembly includes a cable support, an L-shaped opening link, a stop block, and a link return spring; the cable support is fixed on the plate-shaped mounting bracket, the middle of the L-shaped opening link is hinged to the cable support, one end of the L-shaped opening link is provided with a limit structure for cooperating with the stop block, and the other end is provided with a cable mounting structure for mounting the cable; in the natural state, the link return spring makes the limit structure on the L-shaped opening link abut against the stop block; when the L-shaped opening link rotates under the action of a pulling force to overcome the spring force of the link return spring, the L-shaped opening link exerts a thrust on the bottom end of the 7-shaped opening slider to push the 7-shaped opening slider to move towards the top direction to achieve unlocking. Thus, the outer handle assembly on the outer side of the door can be installed at a relatively far place from the lock body to adapt to some specific usage occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram (exploded view of the body) of the construction machinery door lock of the present application;

[0020] Figure 2 It is a schematic structural diagram of the lock body in the solution of this application;

[0021] Figure 3 It is a schematic structural diagram of the primary locking link mechanism in the solution of this application;

[0022] Figure 4 It is a schematic structural diagram of the secondary locking link mechanism in the solution of this application;

[0023] Figure 5 It is a schematic structural diagram of the lock tongue assembly in the solution of this application;

[0024] Figure 6 It is a schematic structural diagram of the opening mechanism in the solution of this application;

[0025] Figure 7 It is a state display diagram of the primary locking link mechanism when the construction machinery door lock in the solution of this application is in the unlocked state;

[0026] Figure 8 It is a state display diagram of the secondary locking link mechanism when the construction machinery door lock in the solution of this application is in the unlocked state;

[0027] Figure 9 It is a state display diagram of the primary locking link mechanism when the construction machinery door lock in the solution of this application is in the primary locked state;

[0028] Figure 10 It is a state display diagram of the secondary locking link mechanism when the construction machinery door lock in the embodiment of this application is in the primary locked state;

[0029] Figure 11 It is a state display diagram of the primary locking link mechanism when the construction machinery door lock in the embodiment of this application is in the secondary locked state;

[0030] Figure 12 It is a state display diagram of the secondary locking link mechanism when the construction machinery door lock in the embodiment of this application is in the secondary locked state;

[0031] Figure 13 A schematic structural diagram of a perspective of the lock body (removing the plate-shaped mounting bracket) in the embodiment of this application;

[0032] Figure 14 It is Figure 13 A schematic structural diagram of another perspective of the structure in;

[0033] Figure 15 It is a schematic structural diagram of the inner opening component in Embodiment 2 of this application;

[0034] Figure 16 It is a cross-sectional view of the inner opening component in Embodiment 2 of this application;

[0035] Figure 17 is Figure 16 an enlarged view of the structure of the part within the A circle in

[0036] Figure 18 a state diagram of the door lock of Embodiment 2 in an application case;

[0037] Figure 19 an exploded view of the door lock of Embodiment 2 of the present application;

[0038] Figure 20 an exploded view of the door lock of Embodiment 3 of the present application;

[0039] Figure 21 a schematic structural diagram of the cable opening assembly in Embodiment 3 of the present application;

[0040] Figure 22 an assembled state diagram of the cable opening assembly in Embodiment 3 of the present application.

[0041] Reference numerals in the drawings: 1 - indoor opening assembly, 101 - lock body cover, 102 - opening button, 103 - B compression spring, 104 - inner handle, 105 - limit support, 106 - safety pin, 107 - safety release handle, 108 - C compression spring; 2 - lock catch; 3 - plate-shaped mounting bracket, 301 - mounting and fixing assembly; 4 - primary lock link mechanism, 401 - primary lock link base, 4011 - primary locking constraint groove, 402 - primary lock rocker, 4021 - oblong hole, 403 - primary lock link, 4031 - primary lock outer link, 4032 - primary lock inner link, 404 - A pin shaft, 405 - A bearing; 5 - secondary lock link mechanism, 501 - secondary lock link base, 5011 - secondary locking constraint groove, 502 - secondary lock rocker, 503 - secondary lock link, 5031 - secondary lock outer link, 5032 - secondary lock inner link, 504 - D pin shaft, 505 - B bearing; 6 - lock tongue assembly, 601 - lock tongue, 6011 - rocker part, 6012 - tongue body, 602 - B pin shaft, 603 - C pin shaft; 7 - opening mechanism, 701 - guide seat, 702 - 7-shaped opening slider, 703 - opening lever, 704 - A compression spring; 8 - cable opening assembly, 801 - cable support, 802 - L-shaped opening link, 8021 - limit structure, 8022 - cable mounting structure, 803 - stop block, 804 - link return spring; 9 - outer handle assembly; 10 - locking holding spring; 11 - unlocking return spring. Detailed implementation manners

[0042] The following further describes the invention related to the present application in conjunction with the drawings and specific implementation manners (embodiments), but it is not used as a basis for limiting the invention. The content not described in detail below is all common technical knowledge in the art.

[0043] The engineering machinery door lock of the present invention is applicable to the cab door of engineering machinery with an outward-opening design.

[0044] See Figure 1-14 , the engineering machinery door lock of the present invention includes a lock body and a lock catch 2 used in combination; in the use state, the lock body is installed on the inner side of the door, and the lock catch 2 is installed on the door frame. The lock body includes a plate-shaped mounting bracket 3, a primary lock link mechanism 4, a secondary lock link mechanism 5, a lock tongue assembly 6, and an opening mechanism 7; among them, the primary lock link mechanism 4 and the lock tongue assembly 6 form a primary locking mechanism, and the secondary lock link mechanism 5 and the lock tongue assembly 6 form a secondary locking mechanism.

[0045] In the solution of the present invention, the plate-shaped mounting bracket 3 is provided with a mounting and fixing assembly 301 for fixing it to the door; the user can fix the plate-shaped mounting bracket 3 to the door through the mounting and fixing assembly 301.

[0046] In the solution of the present invention, the primary lock link mechanism 4 includes a primary lock link base 401, a primary lock rocker 402, and a primary lock link 403; the bottom end of the primary lock rocker 402 is hinged to the primary lock link base 401, a long circular hole 4021 is provided on the primary lock rocker 402, and the rear end of the primary lock link 403 is connected to an A pin shaft 404 that can move along the long circular hole 4021 in the long circular hole 4021.

[0047] In the solution of the present invention, the secondary lock link mechanism 5 includes a secondary lock link base 501, a secondary lock rocker 502, and a secondary lock link 503; the bottom end of the secondary lock rocker 502 is hinged to the secondary lock link base 501, and the top end of the secondary lock rocker 502 is hinged to the rear end of the secondary lock link 503.

[0048] In the solution of the present invention, the lock tongue assembly 6 includes a lock tongue 601, a B pin shaft 602, and a C pin shaft 603; the lock tongue 601 includes a rocker part 6011 and a tongue body 6012 provided on the front side of the rocker part 6011; the bottom end of the rocker part 6011 is respectively hinged to the primary lock link base 401 and the secondary lock link base 501 through the B pin shaft 602; the top end of the rocker part 6011 is respectively hinged to the front ends of the primary lock link 403 and the secondary lock link 503 through the C pin shaft 603.

[0049] In the solution of the present invention, the primary lock link base 401 and the secondary lock link base 501 are fixed to the plate-shaped mounting bracket 3.

[0050] When the engineering machinery door lock of the present invention is in the open state, the included angle θ1 between the primary lock rocker 402 and the primary lock link 403, and the included angle θ2 between the secondary lock rocker 502 and the secondary lock link 503 are both less than 180°; in the primary locked state, the included angle θ1 between the primary lock rocker 402 and the primary lock link 403 is not less than 180°, the A pin shaft 404 is located at the bottom limit position within the long circular hole 4021, the primary lock rocker 402 is subject to a constraint that prevents it from continuing to rotate towards the plate-shaped mounting bracket 3, and the included angle θ2 between the secondary lock rocker 502 and the secondary lock link 503 is still less than 180°; in the secondary locked state, the included angle θ2 between the secondary lock rocker 502 and the secondary lock link 503 is not less than 180°, and the secondary lock rocker 502 is subject to a constraint that prevents it from continuing to rotate towards the plate-shaped mounting bracket 3.

[0051] In the solution of the present invention, the tongue body 6012 of the lock tongue 601 has a U-shaped groove, wherein the groove side closer to the plate-shaped mounting bracket 3 is longer than the other groove side, satisfying that when performing the door closing action in the use state, the longer groove side can abut against the lock rod of the lock catch 2, and the lock rod can push the lock tongue 601 to rotate to the primary locked position and the secondary locked position in sequence; in the locked state, the lock rod of the lock catch 2 is buckled by the U-shaped groove on the tongue body 6012.

[0052] In the solution of the present invention, the opening mechanism 7 includes a guide seat 701, a 7-shaped opening slider 702 and an opening lever 703; the guide seat 701 is fixedly arranged on the plate-shaped mounting bracket 3; the 7-shaped opening slider 702 forms a guiding fit with the guide seat 701; the bottom end of the 7-shaped opening slider 702 extends out from the hole position on the plate-shaped mounting bracket 3 and is pressed tightly by an A compression spring 704; the resistance arm of the opening lever 703 is located below the top of the 7-shaped opening slider 702 and can push the 7-shaped opening slider 702 to move towards the top direction.

[0053] In the solution of the present invention, corresponding to the 7-shaped opening slider 702, a primary lock opening protrusion is provided on the inner side surface of the primary lock rocker 402, and a secondary lock opening protrusion is provided on the inner side surface of the secondary lock rocker 502; the positions of the primary lock opening protrusion and the secondary lock protrusion satisfy: in the primary locked state, the 7-shaped opening slider 702 can be pried to move in the top direction by pushing the power arm of the opening lever 703, or the 7-shaped opening slider 702 can be pushed to move in the top direction by applying a thrust to the bottom end of the 7-shaped opening slider 702, so as to lift the primary lock opening protrusion and achieve unlocking; in the secondary locked state, the 7-shaped opening slider 702 can be pried to move in the top direction by pushing the power arm of the opening lever 703, or the 7-shaped opening slider 702 can be pushed to move in the top direction by applying a thrust to the bottom end of the 7-shaped opening slider 702, so as to lift the secondary lock opening protrusion or lift the two opening protrusions in sequence or lift the two opening protrusions simultaneously to achieve unlocking.

[0054] Embodiment 1 (see Figure 1-14 ):

[0055] In this embodiment, the primary lock connecting rod 403 includes a primary lock outer connecting rod 4031 and a primary lock inner connecting rod 4032 respectively located on both sides of the primary lock rocker 402; the secondary lock connecting rod 503 includes a secondary lock outer connecting rod 5031 and a secondary lock inner connecting rod 5032 respectively located on both sides of the secondary lock rocker 502. The connecting rods in the locking mechanism adopt a design of inner and outer double rods, with reasonable force and can improve the reliability of the mechanism. More specifically, in this embodiment, in order to further improve the structural reliability, the primary lock outer connecting rod 4031 and the primary lock inner connecting rod 4032 are connected through an A bushing 4033, and the secondary lock outer connecting rod 5031 and the secondary lock inner connecting rod 5032 are connected through a B bushing 5033.

[0056] In this embodiment, an A bearing 405 with a suitable size is provided in the oblong hole 4021, and the A pin shaft 404 is assembled in the A bearing 405; a B bearing 505 is provided at the top end of the secondary lock rocker 502, and the secondary lock connecting rod 503 forms a hinge joint with the secondary lock rocker 502 through a D pin shaft 504 assembled in the B bearing 505. With this structure, the mechanism has small running resistance, high reliability, labor-saving door closing and smooth unlocking.

[0057] In this embodiment, the A pin shaft 404 extends out from the inner side of the primary lock inner connecting rod 4032 to form a primary lock opening protrusion; the D pin shaft 504 extends out from the inner side of the secondary lock inner connecting rod 5032 to form a secondary lock opening protrusion. Thus, after locking, unlocking is achieved by lifting the pin shaft.

[0058] In this embodiment, a primary locking constraint groove 4011 is provided on the primary lock link base 401. After the primary lock rocker 402 reaches the primary locking position, it abuts against the A bearing 405 through the primary locking constraint groove 4011 to form a constraint that prevents the primary lock rocker 402 from continuing to rotate towards the plate-shaped mounting bracket 3. A secondary locking constraint groove 5011 is provided on the secondary lock link base 501. After the secondary lock rocker 502 reaches the secondary locking position, it abuts against the B bearing 505 through the secondary locking constraint groove 5011 to form a constraint that prevents the secondary lock rocker 502 from continuing to rotate towards the plate-shaped mounting bracket 3. The provision of the constraint groove on the link base is easy to manufacture and avoids introducing special constraint parts, which is beneficial to cost control.

[0059] In this embodiment, a locking holding spring 10 and an unlocking reset spring 11 are provided in the lock body. The locking holding spring 10 exerts a force on the primary lock rocker 402 and the secondary lock rocker 502, and the direction of the torque generated by this force is the same as the rotation direction during the locking process. In the locked state, it is necessary to overcome the elastic force of the locking holding spring 10 to unlock. The unlocking reset spring 11 exerts a force on the lock tongue 601, and the direction of the torque generated by this force is opposite to the rotation direction during the locking process. After unlocking, the unlocking reset spring 11 drives the lock tongue 601 to rotate in the unlocking direction. In the use state, when closing the door, it is necessary to overcome the spring force of the unlocking reset spring 11, and the unlocking reset spring 11 stores energy. After unlocking, the unlocking reset spring 11 releases energy to reset the lock mechanism.

[0060] In this embodiment, the locking holding spring 10 is a Figure 13 torsion spring as shown in Figure 14 , and the unlocking reset spring 11 is a torsion spring as shown in the appendix

[0061] In this embodiment, when the door lock of the present invention is in the secondary locked state and during the unlocking operation process, the 7-shaped opening slider 702 sequentially lifts the secondary lock opening convex head and the primary lock opening convex head to achieve unlocking. Sequentially lifting the secondary lock opening convex head and the primary lock opening convex head has the characteristic of labor-saving operation.

[0062] In this embodiment, the door lock of the present invention further includes an in-door opening assembly 1. The in-door opening assembly 1 includes a lock body cover 101 and an opening button 102. The lock body cover 101 covers the outside of the lock body and is fixedly arranged relative to the plate-shaped mounting bracket 3. The tongue body 6012 of the lock tongue 601 extends out from an opening at a position near the top of the lock body cover 101. The opening button 102 forms a guiding fit with the top of the lock body cover 101 to push the power arm of the opening lever 703 to achieve unlocking, and after unlocking, it is reset by the B compression spring 103. When in use, unlocking can be achieved by pressing the opening button 102.

[0063] In this embodiment, the side of the lock body cover 101 is provided with an inner handle 104, and the inner handle 104 is provided on the side close to the opening push piece 102. Thus, the user can hold the handle 104 and press the opening push piece 102 to unlock the door, and then open the door, which is convenient to use.

[0064] Example 2 (see Figure 15-19 ):

[0065] Different from Example 1, in this embodiment, the door inner opening component 1 also includes a safety mechanism; the safety mechanism includes a limit support 105, a safety pin 106, a safety release handle 107 and a C compression spring 108; the limit support 105 is fixedly arranged on the outside of the lock body cover 101, the safety pin 106 forms a guide match with the limit support 105 and the front end passes through the through hole on the lock body cover 101 and extends into the lock body cover 101, the safety release handle 107 is L-shaped and is hinged to the limit support 105 or the inner handle 104 to form a lever structure, and the front end of the safety release handle 107 is matched with the groove-shaped or hole-shaped structure at the rear of the safety pin 106. The safety pin 106 is sleeved with a C compression spring 108, and the two ends of the C compression spring 108 are respectively against the limit support 105 and the step at the front of the safety pin 106; in the natural state, the front end of the safety pin 106 forms a limit on the bottom of the opening push piece 102, so that the opening push piece 102 cannot perform the unlocking operation; when unlocking is required, the safety release handle 107 is pulled to drive the safety pin 106 to move outward to release the limit on the opening push piece 102, and the door can be unlocked by the opening push piece 102 at this time; after unlocking, the safety release handle 107 is released, and the safety pin 106 is reset under the action of the C compression spring 108 and drives the safety release handle 107 to reset. When unlocking is required, the safety release handle 107 needs to be pressed before the opening push piece 102 can be pressed, which can prevent people from leaning on the door and hitting the opening push piece 102 to cause accidental opening.

[0066] In this embodiment, the safety mechanism further includes a limit gate plate 109 disposed in the lock body cover 101, and the safety pin 106 forms a guide fit with the limit gate plate 109. By providing the gate plate 109, the safety pin 106 is made more stable.

[0067] As an application case of the door lock in the above-mentioned embodiment 2, the engineering machinery cab door is a conventional outward-opening door design, the lock body is fixed on the inner side of the engineering machinery cab door panel, the outer handle assembly 9 (the outer handle assembly 9 is a prior art) is installed on the outer side of the cab door panel, and the lock catch 2 is installed on the door frame and extends a little relative to the door frame. The user can unlock the door by operating the inner-opening door assembly 1 in the cab, or operate the outer handle assembly 9 outside the cab, and the door can be opened outside the cab after unlocking.

[0068] Example 3 (see Figure 20-22):

[0069] Different from Embodiment 2, in this embodiment, the door lock of the present invention further includes a cable opening assembly 8; the cable opening assembly 8 includes a cable support 801, an L-shaped opening link 802, a stop block 803, and a link return spring 804; the cable support 801 is fixed on the plate-shaped mounting bracket 3, the middle of the L-shaped opening link 802 is hinged to the cable support 801, one end of the L-shaped opening link 802 is provided with a limit structure 8021 for cooperating with the stop block 803, and the other end is provided with a cable mounting structure 8022 for mounting the cable; in the natural state, the link return spring 804 makes the limit structure 8021 on the L-shaped opening link 802 abut against the stop block 803; when the L-shaped opening link 802 rotates under the action of a pulling force to overcome the spring force of the link return spring 804, the L-shaped opening link 802 applies a thrust to the bottom end of the 7-shaped opening slider 702 to push the 7-shaped opening slider 702 to move in the upward direction to achieve unlocking.

[0070] When using the door lock of Embodiment 3 of the present application, the outer handle assembly can be installed at a position far from the lock body. When unlocking the door outside, operate the outer handle assembly to unlock by pulling the cable / rod to drive the L-shaped opening link 802.

[0071] The above embodiments are only preferred implementation manners of the technical solutions of the present application. The technical solutions of the present application are not limited to the application cases in the above embodiments.

[0072] When implementing the solution of the present application, on the premise of setting the unlocking return spring 11, if the included angle θ1 between the primary lock rocker 402 and the primary lock link 403 in the primary locked state is designed to be exactly 180°, theoretically, after the secondary lock is released, under the action of the unlocking return spring 11, the lock tongue rotates in the unlocking direction. After rotating to the primary locked position, due to inertia, it will continue to rotate and automatically release the primary lock. Therefore, at this time, the unlocking in the secondary locked state can be designed to make the 7-shaped opening slider 702 only lift the secondary locked opening protrusion, but this design has very high requirements for manufacturing accuracy. In addition, when implementing the solution of the present application, the unlocking in the secondary locked state can also be designed in the form of lifting two opening protrusions simultaneously, but this design is more laborious when unlocking compared to the above embodiment (lifting the secondary lock opening protrusion and the primary lock opening protrusion in sequence).

[0073] It should be noted that in the field of engineering machinery door locks, the "lock catch" should be understood in a broad sense, and its shape is not limited to a specific form, as long as it can cooperate with the lock body to achieve door locking, and its shape and installation method are determined by the lock body. For example, in the prior art, the locking rod of the lock catch is often designed as a column shape. Of course, there are also U-shaped ones, but the shape and the distribution direction of the U-shaped structure are different from those in the above-mentioned embodiments of the present application. It should also be noted that the locking rod of the lock catch 2 in the present application can also be designed as a column shape, as long as it can cooperate with the lock body of the present application.

[0074] This application is developed for the needs of the cab door of engineering machinery, but is not limited to use in the field of engineering machinery and can also be used in other fields.

[0075] The above general description of the invention involved in the present application and the description of its specific embodiments should not be understood as a limitation on the technical solution of the invention. Those skilled in the art can, based on the disclosure of the present application, without departing from the constituent elements of the invention involved, add, subtract or combine the disclosed technical features in the above general description or / and embodiments to form other technical solutions within the protection scope of the present application.

Claims

1. Construction machinery door lock, characterized in that: This door lock is applicable to doors with an outward-opening design, including a lock body and a lock catch (2) used in combination; The lock body includes a plate-shaped mounting bracket (3), a primary lock link mechanism (4), a secondary lock link mechanism (5), a lock tongue assembly (6), and an opening mechanism (7); The plate-shaped mounting bracket (3) is provided with a mounting and fixing assembly (301) for fixing it to the door; The primary lock link mechanism (4) includes a primary lock link base (401), a primary lock rocker (402), and a primary lock link (403); the bottom end of the primary lock rocker (402) is hinged to the primary lock link base (401), a long circular hole (4021) is provided on the primary lock rocker (402), and the rear end of the primary lock link (403) is connected to a pin A (404) that can move along the long circular hole (4021) within the long circular hole (4021); The secondary lock link mechanism (5) includes a secondary lock link base (501), a secondary lock rocker (502), and a secondary lock link (503); the bottom end of the secondary lock rocker (502) is hinged to the secondary lock link base (501), and the top end of the secondary lock rocker (502) is hinged to the rear end of the secondary lock link (503); The lock tongue assembly (6) includes a lock tongue (601), a pin B (602), and a pin C (603); the lock tongue (601) includes a rocker part (6011) and a tongue body (6012) provided on the front side of the rocker part (6011); the bottom end of the rocker part (6011) is respectively hinged to the primary lock link base (401) and the secondary lock link base (501) through the pin B (602); the top end of the rocker part (6011) is respectively hinged to the front ends of the primary lock link (403) and the secondary lock link (503) through the pin C (603); The primary lock link base (401) and the secondary lock link base (501) are fixed to the plate-shaped mounting bracket (3); In the open state, the included angle θ1 between the primary lock rocker (402) and the primary lock link (403), and the included angle θ2 between the secondary lock rocker (502) and the secondary lock link (503) are both less than 180°; in the primary locked state, the included angle θ1 between the primary lock rocker (402) and the primary lock link (403) is not less than 180°, the pin A (404) is located at the bottom limit position within the long circular hole (4021), the primary lock rocker (402) is subject to a restraint that prevents it from continuing to rotate towards the plate-shaped mounting bracket (3), and the included angle θ2 between the secondary lock rocker (502) and the secondary lock link (503) is still less than 180°; in the secondary locked state, the included angle θ2 between the secondary lock rocker (502) and the secondary lock link (503) is not less than 180°, and the secondary lock rocker (502) is subject to a restraint that prevents it from continuing to rotate towards the plate-shaped mounting bracket (3); The tongue body (6012) of the lock tongue (601) has a U-shaped groove, wherein the groove side closer to the plate-shaped mounting bracket (3) is longer than the other groove side, satisfying that when performing the door closing action in the use state, the longer groove side can abut against the lock rod of the lock catch (2), and the lock tongue (601) is pushed by the lock rod to rotate to the primary locking position and the secondary locking position in sequence; in the locked state, the lock rod of the lock catch (2) is buckled by the U-shaped groove on the tongue body (6012). The opening mechanism (7) includes a guide seat (701), a 7-shaped opening slider (702) and an opening lever (703); the guide seat (701) is fixedly arranged on the plate-shaped mounting bracket (3); the 7-shaped opening slider (702) forms a guiding fit with the guide seat (701); the bottom end of the 7-shaped opening slider (702) extends out from the hole position on the plate-shaped mounting bracket (3) and is pressed tightly by a spring A (704); the resistance arm of the opening lever (703) is located below the top of the 7-shaped opening slider (702) and can push the 7-shaped opening slider (702) to move towards the top direction. Corresponding to the 7-shaped opening slider (702), a primary lock opening convex head is provided on the inner side surface of the primary lock rocker (402), and a secondary lock opening convex head is provided on the inner side surface of the secondary lock rocker (502); the positions of the primary lock opening convex head and the secondary lock convex head satisfy that in the primary locked state, the 7-shaped opening slider (702) can be pried to move towards the top direction by pushing the power arm of the opening lever (703), or the 7-shaped opening slider (702) can be pushed to move towards the top direction by applying a thrust to the bottom end of the 7-shaped opening slider (702), so as to lift the primary lock opening convex head to achieve unlocking; in the secondary locked state, the 7-shaped opening slider (702) can be pried to move towards the top direction by pushing the power arm of the opening lever (703), or the 7-shaped opening slider (702) can be pushed to move towards the top direction by applying a thrust to the bottom end of the 7-shaped opening slider (702), so as to lift the secondary lock opening convex head or lift the two opening convex heads in sequence or lift the two opening convex heads simultaneously to achieve unlocking.

2. The construction machinery door lock according to claim 1, characterized in that: The primary lock connecting rod (403) includes a primary lock outer connecting rod (4031) and a primary lock inner connecting rod (4032) respectively located on both sides of the primary lock rocker (402); the secondary lock connecting rod (503) includes a secondary lock outer connecting rod (5031) and a secondary lock inner connecting rod (5032) respectively located on both sides of the secondary lock rocker (502).

3. The construction machinery door lock according to claim 2, characterized in that: An A bearing (405) with a matching size is arranged in the long circular hole (4021), and the A pin shaft (404) is assembled in the A bearing (405); a B bearing (505) is arranged at the top end of the secondary lock rocker (502), and the secondary lock connecting rod (503) forms a hinge connection with the secondary lock rocker (502) through a D pin shaft (504) assembled in the B bearing (505).

4. The construction machinery door lock according to claim 3, characterized in that: The A pin shaft (404) extends from the inner side of the primary lock inner connecting rod (4032) to form a primary lock opening convex head; the D pin shaft (504) extends from the inner side of the secondary lock inner connecting rod (5032) to form a secondary lock opening convex head.

5. The construction machinery door lock according to claim 3, characterized in that: The primary lock connecting rod base (401) is provided with a primary locking constraint groove (4011). After the primary lock rocker (402) reaches the primary locking position, it abuts against the A bearing (405) through the primary locking constraint groove (4011) to form a constraint that prevents the primary lock rocker (402) from continuing to rotate towards the plate-shaped mounting bracket (3); the secondary lock connecting rod base (501) is provided with a secondary locking constraint groove (5011). After the secondary lock rocker (502) reaches the secondary locking position, it abuts against the B bearing (505) through the secondary locking constraint groove (5011) to form a constraint that prevents the secondary lock rocker (502) from continuing to rotate towards the plate-shaped mounting bracket (3).

6. The construction machinery door lock according to claim 1, characterized in that: The lock body is provided with a locking holding spring (10) and an unlocking reset spring (11); the locking holding spring (10) applies a force to the primary lock rocker (402) and the secondary lock rocker (502), and the direction of the torque generated by this force is the same as the rotation direction during the locking process. In the locked state, it is necessary to overcome the elastic force of the locking holding spring (10) to unlock; the unlocking reset spring (11) applies a force to the lock tongue (601), and the direction of the torque generated by this force is opposite to the rotation direction during the locking process. After unlocking, the unlocking reset spring (11) drives the lock tongue (601) to rotate in the unlocking direction.

7. The construction machinery door lock according to claim 6, characterized in that: Both the locking holding spring (10) and the unlocking reset spring (11) are torsion springs.

8. The construction machinery door lock according to claim 6, wherein: In the secondary locked state, during the unlocking operation, the 7-shaped opening slider (702) sequentially lifts the secondary lock opening convex head and the primary lock opening convex head to achieve unlocking.

9. The construction machinery door lock according to any one of claims 1-8, characterized in that: It further includes an in-door opening assembly (1); the in-door opening assembly (1) includes a lock body cover (101) and an opening button (102); the lock body cover (101) covers the outside of the lock body and is fixedly arranged relative to the plate-shaped mounting bracket (3); the tongue body (6012) of the lock tongue (601) extends out from an opening at a position near the top of the lock body cover (101); the opening button (102) forms a guiding fit with the top of the lock body cover (101) and is used to push the power arm of the opening lever (703) to achieve unlocking, and after unlocking, it is reset by the B compression spring (103).

10. The construction machinery door lock according to claim 9, characterized in that: The side part of the lock body cover (101) is provided with an inner handle (104), and the inner handle (104) is arranged on the side close to the opening button (102).

11. The construction machinery door lock according to claim 10, characterized in that: The door inner opening assembly (1) further includes a safety mechanism; the safety mechanism includes a limit support (105), a safety pin (106), a safety release handle (107), and a C compression spring (108); the limit support (105) is fixedly arranged on the outside of the lock body cover (101), the safety pin (106) forms a guiding fit with the limit support (105) and its front end passes through the through hole on the lock body cover (101) and extends into the lock body cover (101), the safety release handle (107) is L-shaped and is hinged to the limit support (105) or the inner handle (104) to form a lever structure, the front end of the safety release handle (107) cooperates with the groove-shaped or hole-shaped structure at the rear of the safety pin (106), the safety pin (106) is sleeved with a C compression spring (108), and the two ends of the C compression spring (108) respectively abut against the limit support (105) and the step at the front of the safety pin (106); in the natural state, the front end of the safety pin (106) limits the bottom of the opening button (102) so that the opening button (102) cannot perform the unlocking operation; when unlocking is required, pulling the safety release handle (107) drives the safety pin (106) to move outwards to release the limit on the opening button (102), and at this time, unlocking can be performed through the opening button (102); after unlocking, releasing the safety release handle (107), the safety pin (106) resets under the action of the C compression spring (108) and drives the safety release handle (107) to reset.

12. The construction machinery door lock according to claim 11, wherein: The safety mechanism further includes a limit gate plate (109) arranged inside the lock body cover (101), and the safety pin (106) forms a guiding fit with the limit gate plate (109).

13. The construction machinery door lock according to any one of claims 1-8, 10, 11, and 12, characterized in that: It further includes a cable opening assembly (8); the cable opening assembly (8) includes a cable support (801), an L-shaped opening connecting rod (802), a stop block (803), and a connecting rod return spring (804); the cable support (801) is fixed on the plate-shaped mounting bracket (3), the middle of the L-shaped opening connecting rod (802) is hinged to the cable support (801), one end of the L-shaped opening connecting rod (802) is provided with a limit structure (8021) for cooperating with the stop block (803), and the other end is provided with a cable mounting structure (8022) for mounting the cable; in the natural state, the connecting rod return spring (804) makes the limit structure (8021) on the L-shaped opening connecting rod (802) abut against the stop block (803); when the L-shaped opening connecting rod (802) rotates under the action of a pulling force to overcome the spring force of the connecting rod return spring (804), the L-shaped opening connecting rod (802) applies a thrust to the bottom end of the 7-shaped opening slider (702) to push the 7-shaped opening slider (702) to move towards the top direction to achieve unlocking.

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