A three-gear key knob

Abstract

The application provides a three-gear key knob, and belongs to the technical field of electric equipment control. The three-gear key knob comprises an upper cover and a base, the upper cover is used in cooperation with the base, a rotating lock body is installed in the middle of the base and penetrates the upper cover, the rotating lock body comprises a middle seat, a lock cylinder is rotatably installed on the inner wall of the middle seat, the lock cylinder is used in cooperation with an external key, and a position adjusting mechanism is installed at the bottom of the lock cylinder. The three-gear key knob realizes accurate locking of gears and clear tactile feedback through cooperation of the position adjusting mechanism and a gear push rod, changes the on-off of each circuit in a control circuit through cooperation of a cam block and a contact push rod, and locks the relative position of the cam block and the contact push rod through cooperation of a positioning wheel and the gear push rod, so that the adjusted gear is stably fixed, gear deviation caused by vibration or accidental touch is prevented, and circuit misoperation is avoided.

Description

Technical Field

[0001] This invention relates to the field of power equipment control technology, and in particular to a three-position key knob. Background Technology

[0002] In scenarios such as elevator control cabinets, forklifts, warehousing machinery, and large electromechanical equipment, where circuit switching or function regulation is required through gear shifting, the three-position key knob is particularly suitable for equipment control links with high requirements for operating authority, gear accuracy, and long-term reliability. As a core control component of such equipment, the three-position key knob's functional integration, gear positioning accuracy, ease of maintenance, and security directly affect the equipment's operating efficiency and operational safety.

[0003] Existing three-position switches rely on simple mechanical structures for gear switching and lack gear locking and tactile feedback designs. This makes it impossible for operators to determine the current gear by touch, which can easily lead to over-turning or gear misalignment, causing circuit malfunctions. At the same time, the sliding parts inside the three-position switch are in a reciprocating motion state for a long time, which can easily cause jamming and abnormal noise due to friction and wear, affecting the smoothness of operation. Existing three-position switches require disassembly of the entire switch for lubrication and maintenance, which is cumbersome and can easily damage internal components. Furthermore, in scenarios such as elevators and large production equipment, it is necessary to strictly limit operating permissions to prevent unauthorized personnel from misoperating or maliciously interfering. However, most existing three-position switches can be adjusted directly without a key.

[0004] Therefore, this application provides a three-position key knob to meet the requirements. Summary of the Invention

[0005] The technical problem this invention aims to solve is to provide a three-position key knob that achieves precise gear locking and clear tactile feedback through the cooperation of an adjustment mechanism and a gear shift lever. The cam block and contact push rod work together to change the on / off state of various circuits in the control circuit. Simultaneously, the positioning wheel and gear shift lever work together to lock the relative positions of the cam block and contact push rod, ensuring stable and fixed gear position after adjustment and preventing gear shift due to vibration or accidental touch, thus avoiding accidental circuit interruption. Furthermore, this key knob uses a built-in lubrication channel to reduce friction in sliding parts, improving operational smoothness. This solves the problems of existing three-position key knobs that are prone to over-turning or gear shift, leading to accidental circuit interruption, and the internal sliding parts being prone to jamming and abnormal noise due to frictional wear, affecting operational smoothness.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A three-position key knob includes an upper cover and a base, which are used together. A lock body is installed in the middle of the base and penetrates the upper cover. The lock body includes a middle seat, and a lock cylinder is rotatably installed on the inner wall of the middle seat. The lock cylinder is used in conjunction with an external key. An adjustment mechanism is installed at the bottom of the lock cylinder. The four sides of the bottom surface of the base have two sliding grooves, each with two sets, and the two sliding grooves are arranged adjacent to each other. A position push rod is slidably connected to the inner wall of the first sliding groove, and a contact push rod is slidably connected to the inner wall of the second sliding groove. Both the contact push rod and the position push rod are used in conjunction with the adjustment mechanism.

[0008] Optionally, the inner wall of the middle part of the top cover is provided with a slot, the outer wall of the middle seat is fixedly installed with a limiting strip, the limiting strip is engaged with the slot, and the middle seat is fixedly connected to the inner wall of the middle part of the top cover. The outer walls on both sides of the bottom of the middle seat are provided with limiting grooves, and the inner wall of the top of the top cover is inserted with a connecting buckle, and the inner walls at both ends of the connecting buckle are engaged with two sets of limiting grooves.

[0009] Optionally, the adjusting mechanism includes a cam block, which is used in conjunction with two sets of contact push rods. A positioning wheel is fixedly installed at the bottom of the cam block, and the positioning wheel is used in conjunction with two sets of gear push rods. A set bolt is provided on the inner wall of the cam block and the positioning wheel. The top of the cam block engages with the bottom of the lock cylinder and is fixedly connected by the set bolt.

[0010] Optionally, buckles are fixedly installed on both sides of the top cover, and locking posts are fixedly installed at the four corners of the bottom of the top cover. Buckle holes are opened on both sides of the inner wall of the base, and the buckles are engaged with the corresponding buckle holes. Positioning holes are opened on the end walls at the four corners of the base, and the locking posts are inserted into the corresponding positioning holes. The top cover and the base are engaged by the cooperation of buckles and buckle holes.

[0011] Optionally, a reset spring is fixedly installed on the inner wall of the gear shift lever, and the other end of the reset spring is fixedly connected to the inner wall of the base.

[0012] Optionally, guide posts are provided on both sides of the contact push rod, and the end wall of the guide post is fixedly connected to the inner wall of the base. The same moving contact is slidably connected on the two sets of guide posts, and the middle part of the moving contact is fixedly connected to the inner wall of the contact push rod. A contact spring is fixedly installed on the inner wall of the contact push rod, and the other end of the contact spring is fixedly connected to the inner wall of the base.

[0013] Optionally, a connecting bridge is fixedly installed on the other end wall of each of the two sets of guide columns, and the connecting bridge is snapped into the inner wall of the base. A positioning bolt is engaged on the outer end wall of the connecting bridge, and a conductive gasket is movably installed on the inner wall of the positioning bolt. The conductive gasket can be used in conjunction with the connecting bridge. A connecting groove is opened on both end walls of the base, and the connecting groove is connected to the conductive gasket.

[0014] Optionally, a positioning seat is fixedly installed on the inner wall of the middle part of the base, and the positioning seat is rotatably connected to the inner wall of the positioning wheel. An oil outlet groove is opened on the side wall of the positioning seat, and an oil guide groove is opened on the inner wall of the positioning wheel. The oil guide groove is connected to the oil outlet groove. A one-way valve is fixedly installed on the inner wall of the bottom of the positioning seat, and the one-way valve is located at the bottom of the oil outlet groove. A cross groove is opened at the center of the outer wall of the bottom of the base, and a cross seal is engaged on the inner wall of the cross groove. An oil buffer area is opened on the inner wall of the middle part of the base, and the oil buffer area is connected to both slide groove one and slide groove two.

[0015] Optionally, oil injection holes are provided on both sides of the top of the upper cover, and a plunger is engaged in the inner wall of the oil injection hole. A lubrication groove is provided on the inner wall of the top of the upper cover, and the lubrication groove is connected to the oil injection hole.

[0016] Optionally, an outer shell is fixedly installed on the outer wall of the middle seat. The outer shell has external threads, and an installation nut engages with the outer shell. An O-ring is engaged between the installation nut and the outer shell.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] In the above solution, the precise locking of the gear position and clear tactile feedback are achieved through the cooperation of the adjustment mechanism and the gear position push rod. The positioning wheel in the adjustment mechanism is always in close cooperation with the two sets of gear position push rods, and a return spring is fixedly installed on the inner wall of the gear position push rod. The return spring always provides a downward thrust to the gear position push rod. When the knob is rotated for adjustment, the operator can accurately judge the current gear position through obvious tactile feedback, that is, the change in the thrust provided by the return spring, avoiding the problem of not being able to perceive the gear position. At the same time, the cooperation between the positioning wheel and the gear position push rod can lock the relative position of the cam block and the contact push rod, ensuring that the adjusted gear position is stable and fixed, preventing gear position deviation caused by vibration or accidental touch, and thus preventing accidental circuit interruption.

[0019] This key knob reduces friction in sliding parts and improves operational smoothness through built-in lubrication channels. The base has a positioning seat and an oil outlet groove, and the inner wall of the positioning wheel has an oil guide groove, which is connected to the oil outlet groove. The base also has an oil buffer area, which can be connected to the first slide groove of the gear shift lever and the second slide groove of the contact push rod. At the same time, the top of the cover has an oil injection hole and a lubrication groove. Lubricating oil can be injected through a one-way valve and flows through the oil guide groove and the oil buffer area to the sliding area of ​​the gear shift lever and the contact push rod, as well as the rotation area of ​​the positioning wheel and the positioning seat. The lubricating oil can effectively reduce friction and wear of sliding parts, fundamentally avoiding jamming and abnormal noise problems after long-term use, and ensuring smooth operation. Attached Figure Description

[0020] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0021] Figure 1 A three-dimensional structural diagram of a three-position key knob;

[0022] Figure 2 This is an assembly diagram of the various parts on the outer wall of the central seat;

[0023] Figure 3 This is a schematic diagram of the assembly of the middle seat and the upper cover;

[0024] Figure 4 This is a schematic diagram of the assembly of the connecting buckle and the top cover;

[0025] Figure 5 This is an assembly diagram of the connector and the center seat;

[0026] Figure 6 This is a schematic diagram of the installation of the rotary lock body;

[0027] Figure 7 This is a schematic diagram of the assembly of the upper limit bar and the slot in the middle seat;

[0028] Figure 8 This is an assembly diagram of the top cover, middle seat, and base;

[0029] Figure 9 This is a schematic diagram of the internal structure of the top cover;

[0030] Figure 10 This is a schematic diagram of the assembly of the rotary lock body and the base;

[0031] Figure 11 This is a schematic diagram of the structure of a spiral lock.

[0032] Figure 12 This is a split view of the spinlock body;

[0033] Figure 13 This is a schematic diagram of the assembly of the lock cylinder and the adjusting mechanism;

[0034] Figure 14 This is a schematic diagram showing the connection between the lock cylinder and the adjusting mechanism;

[0035] Figure 15 This is a schematic diagram showing the installation of the cam block and the positioning wheel;

[0036] Figure 16 This is a schematic diagram showing the installation of the top cover, gear shift lever, and contact lever.

[0037] Figure 17 This is a schematic diagram of the internal structure of the base;

[0038] Figure 18 This is a schematic diagram showing the installation of the positioning bolts and conductive pads inside the base;

[0039] Figure 19 This is an assembly diagram of the connecting bridge inside the base;

[0040] Figure 20 This is a schematic diagram showing the interaction between the adjusting mechanism and the two sets of contact push rods;

[0041] Figure 21 This is a schematic diagram showing the interaction between the adjustment mechanism and the two sets of gear shift levers;

[0042] Figure 22 This is a schematic diagram showing the interaction between the positioning wheel and the gear shift lever;

[0043] Figure 23 This is a breakdown diagram of the engagement between the positioning wheel and the gear shift lever;

[0044] Figure 24 This is a cross-sectional view of the fit between the cam block and the contact push rod.

[0045] Figure 25 This is a schematic diagram of the assembly of the moving contact and the guide post;

[0046] Figure 26 This is a breakdown diagram of the components on the contact push rod;

[0047] Figure 27 This is a schematic diagram of the structure at the bottom of the base;

[0048] Figure 28 This is a plan view of the internal components of the base.

[0049] Figure label:

[0050] 100. Top cover; 101. Slot; 102. Snap-on; 103. Snap-on pin; 104. Oil injection hole; 105. Plunger; 106. Lubrication groove; 110. Twisting lock body; 111. Middle seat; 112. Limiting strip; 113. Limiting groove; 114. Lock cylinder; 120. Adjustment mechanism; 121. Cam block; 122. Positioning wheel; 123. Oil guide groove; 124. Set bolt; 130. Connecting buckle; 140. Mounting nut; 150. O-ring; 160. Outer shell; 200. Bottom Seat; 201, Buckle Hole; 202, Positioning Hole; 210, Slide Rail 1; 211, Gear Push Rod; 212, Return Spring; 220, Slide Rail 2; 221, Contact Push Rod; 222, Guide Post; 223, Moving Contact; 224, Contact Spring; 225, Connecting Bridge; 226, Positioning Bolt; 227, Conductive Gasket; 230, Connecting Groove; 240, Positioning Seat; 241, Oil Outlet Groove; 242, One-Way Valve; 243, Cross Groove; 244, Cross Seal; 245, Oil Buffer Area.

[0051] As shown in the figure, specific structures and devices are labeled in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0052] The following is a detailed description of a three-position key knob provided by the present invention, with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0053] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0054] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0055] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0056] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0057] like Figures 1 to 28 As shown, an embodiment of the present invention provides a three-position key knob, including an upper cover 100 and a base 200. The upper cover 100 and the base 200 are used together and serve as carriers for the key switch structure, protecting and fixing the position of each component. The key feature is that a lock body 110 is installed in the middle of the base 200, and the lock body 110 penetrates the upper cover 100. The lock body 110 includes a middle seat 111, and a lock cylinder 114 is rotatably mounted on the inner wall of the middle seat 111. The lock cylinder 114 is used in conjunction with an external key, and the lock cylinder 114 can only be rotated by the corresponding key to prevent external interference with the elevator's movement. An adjustment mechanism 120 is installed at the bottom of the lock cylinder 114. The bottom surface of the 200 has two sets of sliding grooves 210 and 220 on the four sides. The sliding grooves 210 and 220 are arranged adjacent to each other. A gear position push rod 211 is slidably connected to the inner wall of the sliding groove 210, and a contact push rod 221 is slidably connected to the inner wall of the sliding groove 220. Both the contact push rod 221 and the gear position push rod 211 are used in conjunction with the adjustment mechanism 120. In this invention, the connection state between the moving contact 223 and the connecting bridge 225 is changed by the cooperation of the cam block 121 at the bottom of the lock cylinder 114 and the contact push rod 221, thereby changing the circuit on and off. The gear position is confirmed by the cooperation of the gear position push rod 211 and the positioning wheel 122.

[0058] like Figures 3 to 5 As shown, a slot 101 is provided on the inner wall of the middle part of the upper cover 100. A limiting strip 112 is fixedly installed on the outer wall of the middle seat 111. The limiting strip 112 is engaged with the slot 101, and the middle seat 111 is fixedly connected to the inner wall of the middle part of the upper cover 100. Through the cooperation of the limiting strip 112 and the slot 101, the middle seat 111 can be installed in the upper cover 100. Limiting grooves 113 are provided on the outer walls of both sides of the bottom of the middle seat 111. A connecting buckle 130 is inserted into the inner wall of the top of the upper cover 100, and the inner walls of both ends of the connecting buckle 130 are engaged with the two sets of limiting grooves 113. The connecting buckle 130 can install the rotary lock body 110 and the upper cover 100 together and lock them to prevent the rotary lock body 110 and the upper cover 100 from accidentally falling off.

[0059] like Figure 15 , Figures 20 to 26As shown, the adjustment mechanism 120 includes a cam block 121, which works in conjunction with two sets of contact push rods 221. The cam block 121 can only push one set of contact push rods 221 at a time, or it may not push the contact push rods 221 at all. Simultaneously, the cooperation between the contact push rods 221 and the cam block 121 controls the conduction of the circuit. A positioning wheel 122 is fixedly mounted at the bottom of the cam block 121. The positioning wheel 122 works in conjunction with two sets of gear push rods 211. During gear adjustment, the positioning wheel 122 always cooperates with the gear push rods 211. This ensures sufficient feedback force, allowing the user to clearly identify each gear position. At the same time, the cooperation between the positioning wheel 122 and the gear position push rod 211 can "lock the cooperation between the cam block 121 and the contact push rod 221", thereby ensuring that the knob is always in that gear position. The inner wall of the cam block 121 and the positioning wheel 122 is provided with a set bolt 124. The top of the cam block 121 is engaged with the bottom of the lock cylinder 114 and is fixedly connected by the set bolt 124. The set bolt 124 limits the adjustment mechanism 120 and installs it onto the lock cylinder 114.

[0060] like Figures 8 to 10 As shown, buckles 102 are fixedly installed on both sides of the top cover 100, and locking posts 103 are fixedly installed at the four corners of the bottom of the top cover 100. Buckle holes 201 are opened on both sides of the inner wall of the base 200, and the buckles 102 are engaged with the corresponding buckle holes 201. Positioning holes 202 are opened on the end walls at the four corners of the base 200, and the locking posts 103 are inserted into the corresponding positioning holes 202. The top cover 100 and the base 200 are engaged by the cooperation of buckles 102 and buckle holes 201. By utilizing the cooperation of buckles 102 and buckle holes 201 and the cooperation of locking posts 103 and positioning holes 202, the top cover 100 and the base 200 can be installed together.

[0061] like Figure 22 and Figure 23 As shown, a return spring 212 is fixedly installed on the inner wall of the gear shift lever 211, and the other end of the return spring 212 is fixedly connected to the inner wall of the base 200. The return spring 212 can push against the gear shift lever 211, so that the gear shift lever 211 is always in a downward pushing force, effectively fixing the gear position. In this invention, when the key switch is rotated, it can provide obvious tactile feedback for each gear and fix the position of each gear to prevent unclear gear position and prevent reverse rotation.

[0062] like Figure 16 , Figures 18 to 21 , Figures 24 to 26As shown, guide posts 222 are provided on both sides of the contact push rod 221. The contact push rod 221 serves to protect and support the moving contact 223 as it moves up and down, thus connecting and disconnecting the switch. The end wall of the guide post 222 is fixedly connected to the inner wall of the base 200, and the base 200 supports the guide post 222. The same moving contact 223 is slidably connected to both sets of guide posts 222. The guide posts 222 guide the movement of the moving contact 223. The guide posts 222 are made of insulating material to avoid interfering with circuit continuity. The middle part of the moving contact 223 is fixedly connected to the inner wall of the contact push rod 221. A contact spring 224 is fixedly installed on the inner wall of the contact push rod 221, and the other end of the contact spring 224 is connected to the base 200. The inner wall is fixedly connected, and the contact spring 224 can hold the moving contact 223, so that the switch is always under a downward thrust to reset the switch. The other end wall of both sets of guide posts 222 is fixedly installed with a connecting bridge 225, which is engaged with the inner wall of the base 200. The connecting bridge 225 and the moving contact 223 can act as a connecting bridge for switching on and off in the circuit. The outer end wall of the connecting bridge 225 is engaged with a positioning bolt 226, which is used to lock the wires connected to both ends of the switch. A conductive pad 227 is movably installed on the inner wall of the positioning bolt 226, and the conductive pad 227 can be used in conjunction with the connecting bridge 225. A wire can be inserted between the conductive pad 227 and the connecting bridge 225 to connect the device to the circuit. Both end walls of the base 200 are... A wiring groove 230 is provided, and the wiring groove 230 is connected to the conductive pad 227. In this invention, the wiring groove 230 connects the wire between the conductive pad 227 and the connecting bridge 225, thereby connecting the key knob to the circuit inside the elevator control cabinet. When it is necessary to connect the circuit on the right side of the knob, the key is inserted into the lock cylinder 114 and turned to the left, causing the key to drive the lock cylinder 114 to turn to the left. At this time, the lock cylinder 114 drives the bottom cam block 121 to contact the left contact push rod 221, thereby pushing the contact push rod 221 to move backward. This causes the contact push rod 221 to drive the moving contact 223 to move backward on the guide post 222, and the contact spring 224 is compressed. At this time, the moving contact 223 separates from the connecting bridge 225, so that "connecting bridge 225—moving contact 223" is connected. The circuit between "link bridge 225" and "moving contact 223" on the right side is disconnected, while the circuit between "link bridge 225 - moving contact 223 - link bridge 225" on the right side is connected. The shift lever 211 can limit the positioning wheel 122, ensuring that the cam block 121 always remains in contact with the left contact push rod 221. This ensures that the circuit on the right side of the knob is conductive while the circuit on the left side is disconnected. Conversely, when it is necessary to activate the circuit on the left side of the knob, this can be achieved by inserting a key into the lock cylinder 114 and turning the key to the right. When it is necessary to activate the circuit on both sides of the knob, a key is inserted into the lock cylinder 114 and held in the middle. In this case, the cam block 121 at the bottom of the lock cylinder 114 does not contact either set of contact push rods 221, meaning that the moving contacts 223 on both sides are connected to the link bridge 225.Ensure that the circuits between "linkage bridge 225 - moving contact 223 - linkage bridge 225" on both sides of the knob are continuous, thereby guaranteeing the continuity of the circuits on both sides of the knob.

[0063] like Figure 9 , Figure 17 and Figure 27 As shown, a positioning seat 240 is fixedly installed on the inner wall of the middle part of the base 200, and the positioning seat 240 is rotatably connected to the inner wall of the positioning wheel 122. The positioning seat 240 limits and supports the positioning wheel 122. An oil outlet groove 241 is opened on the side wall of the positioning seat 240, and an oil guide groove 123 is opened on the inner wall of the positioning wheel 122. The oil guide groove 123 is connected to the oil outlet groove 241. There are four sets of oil guide grooves 123, which are connected to the first slide groove 210 and the second slide groove 220, so as to facilitate the lubrication of the first slide groove 210 and the second slide groove 220. A one-way valve 2 is fixedly installed on the inner wall of the bottom of the positioning seat 240. 42, and the one-way valve 242 is located at the bottom of the oil outlet groove 241. The one-way valve 242 can prevent lubricating oil from flowing back out of the knob. A cross groove 243 is opened at the center of the outer wall of the bottom of the base 200. A cross seal 244 is snapped into the inner wall of the cross groove 243. The cross seal 244 provides protection for the through hole in the middle of the positioning seat 240, preventing the through hole in the middle of the positioning seat 240 from being blocked by dust. It can also protect the one-way valve 242. An oil buffer area 245 is opened in the middle inner wall of the base 200. The oil buffer area 245 is connected to the slide groove 1 210 and slide groove 220. The oil buffer zone 245 can buffer the lubricating oil injected into the knob. The connection between the oil buffer zone 245 and the first slide 210 and the second slide 220 is inclined to facilitate the flow of lubricating oil into the slides 210 and 220. Oil injection holes 104 are provided on both sides of the top of the upper cover 100. A plunger 105 is engaged with the inner wall of each oil injection hole 104. A lubrication groove 106 is provided on the inner wall of the top of the upper cover 100, and the lubrication groove 106 communicates with the oil injection hole 104. In this invention, if the key becomes difficult to rotate during the use of the knob, the base can be removed. The cross-shaped cover 244 at the bottom of 200 introduces insulating lubricating oil into the positioning seat 240 through the one-way valve 242. This lubricating oil in the positioning seat 240 enters the oil buffer zone 245 through the oil outlet groove 241 and the oil guide groove 123, and then flows from the oil buffer zone 245 to the slide groove 1 210 and slide groove 220. At the same time, by removing the plunger 105, insulating lubricating oil is injected into the knob through the oil injection hole 104, allowing the lubricating oil to flow into the lubrication groove 106. This lubricates the movement of the gear shift lever 211 and the contact lever 221, facilitating the rotation of the key knob.

[0064] like Figure 1 and Figure 2As shown, an outer shell 160 is fixedly installed on the outer wall of the middle seat 111. The outer shell 160 has external threads on its outer wall. The outer shell 160 is a metal shell, machined and formed. The external threads facilitate installation and fixation, provide protection for the internal structure and fix the lock cylinder 114. An installation nut 140 is engaged on the outer wall of the outer shell 160. When installing the key knob, the installation nut 140 is fixed to the mounting panel. An O-ring 150 is engaged between the installation nut 140 and the outer shell 160. The O-ring 150 can prevent the installation nut 140 from retracting due to vibration when installing the key knob. In this invention, the key knob can be installed into the corresponding elevator control cabinet by utilizing the cooperation between the outer shell 160 and the installation nut 140.

[0065] The working principle of the technical solution provided by this invention is as follows:

[0066] Using the cooperation of the outer casing 160 and the mounting nut 140, the key knob is installed into the corresponding elevator control cabinet. A wire is connected between the conductive pad 227 and the connecting bridge 225 via the wiring groove 230, thus connecting the key knob to the circuit inside the elevator control cabinet. When the circuit on the right side of the knob needs to be activated, the key is inserted into the lock cylinder 114 and turned left, causing the key to drive the lock cylinder 114 to turn left. At this time, the lock cylinder 114 drives the bottom cam block 121 to contact the left-side contact push rod 221, thereby pushing the contact push rod 221 backward. This causes the contact push rod 221 to drive the moving contact 223 backward on the guide post 222, and the contact spring 224 is compressed. At this time, the moving contact 223 separates from the connecting bridge 225, breaking the circuit between "connecting bridge 225 - moving contact 223 - connecting bridge 225". Simultaneously, the right-side "chain"... The circuit between “connecting bridge 225 – moving contact 223 – connecting bridge 225” is connected, and the shift push rod 211 can limit the positioning wheel 122, so that the cam block 121 always keeps in contact with the left contact push rod 221, thereby ensuring that the circuit on the right side of the knob is connected while the circuit on the left side is disconnected. Conversely, when it is necessary to connect the circuit on the left side of the knob, it can be achieved by inserting a key into the lock cylinder 114 and turning the key to the right. When it is necessary to connect the circuit on both sides of the knob, a key is inserted into the lock cylinder 114 and kept in the middle. At this time, the cam block 121 at the bottom of the lock cylinder 114 does not contact any set of contact push rods 221, that is, the moving contacts 223 on both sides are connected to the connecting bridge 225, ensuring that the circuit between “connecting bridge 225 – moving contact 223 – connecting bridge 225” on both sides of the knob is connected, thereby ensuring that the circuit on both sides of the knob is connected.

[0067] If the key does not rotate smoothly during the use of the knob, remove the cross-shaped cover 244 at the bottom of the base 200, and add insulating lubricating oil into the positioning seat 240 through the one-way valve 242. The lubricating oil in the positioning seat 240 enters the oil buffer area 245 through the oil outlet groove 241 and the oil guide groove 123, and flows from the oil buffer area 245 to the slide groove 1 210 and slide groove 220. At the same time, remove the plunger 105 and inject insulating lubricating oil into the knob through the oil injection hole 104, so that the lubricating oil flows into the lubrication groove 106, thereby lubricating the movement of the gear shift lever 211 and the contact lever 221, making it easier to rotate the key knob.

[0068] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0069] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A three-position key knob, comprising an upper cover and a base, wherein the upper cover and the base are used in conjunction, characterized in that, A rotary lock body is installed in the middle of the base and penetrates the upper cover. The rotary lock body includes a middle seat, and a lock cylinder is rotatably installed on the inner wall of the middle seat. The lock cylinder is used in conjunction with an external key, and an adjustment mechanism is installed at the bottom of the lock cylinder. The base has two sets of sliding grooves on the four sides of the bottom surface. The sliding grooves are arranged adjacent to each other. A gear position push rod is slidably connected to the inner wall of the sliding groove, and a contact push rod is slidably connected to the inner wall of the sliding groove. Both the contact push rod and the gear position push rod are used in conjunction with the adjustment mechanism. The adjustment mechanism includes a cam block, which works in conjunction with two sets of contact push rods. A positioning wheel is fixedly installed at the bottom of the cam block, which works in conjunction with two sets of gear push rods. A set bolt is provided on the inner wall of the cam block and the positioning wheel. The top of the cam block engages with the bottom of the lock cylinder and is fixedly connected by the set bolt. The upper cover is fixedly installed with buckles on both sides of the end wall, and the upper cover is fixedly installed with locking posts at the four corners of the bottom. The base is provided with buckle holes on both sides of the inner wall, and the buckles are engaged with the corresponding buckle holes. The base is provided with positioning holes on the end wall at the four corners, and the locking posts are inserted into the corresponding positioning holes. The upper cover and the base are engaged by the cooperation of buckles and buckle holes. The contact push rod is provided with guide posts on both sides, and the end wall of the guide post is fixedly connected to the inner wall of the base. The same moving contact is slidably connected on the two sets of guide posts, and the middle part of the moving contact is fixedly connected to the inner wall of the contact push rod. A contact spring is fixedly installed on the inner wall of the contact push rod, and the other end of the contact spring is fixedly connected to the inner wall of the base. Both sets of guide columns have a connecting bridge fixedly installed on the other end wall, and the connecting bridge is snapped into the inner wall of the base. The outer end wall of the connecting bridge is engaged with a positioning bolt, and the inner wall of the positioning bolt is movably installed with a conductive pad, which can be used in conjunction with the connecting bridge. Both end walls of the base are provided with connecting grooves, and the connecting grooves are connected to the conductive pads. A positioning seat is fixedly installed on the inner wall of the middle part of the base, and the positioning seat is rotatably connected to the inner wall of the positioning wheel. An oil outlet groove is opened on the side wall of the positioning seat, and an oil guide groove is opened on the inner wall of the positioning wheel. The oil guide groove is connected to the oil outlet groove. A one-way valve is fixedly installed on the inner wall of the bottom of the positioning seat, and the one-way valve is located at the bottom of the oil outlet groove. A cross groove is opened at the center of the outer wall of the bottom of the base, and a cross seal is engaged on the inner wall of the cross groove. An oil buffer area is opened on the inner wall of the middle part of the base, and the oil buffer area is connected to both slide groove one and slide groove two.

2. A three-position key knob according to claim 1, characterized in that, The inner wall of the upper cover is provided with a slot, and a limiting strip is fixedly installed on the outer wall of the middle seat. The limiting strip is engaged with the slot, and the middle seat is fixedly connected to the inner wall of the upper cover. Limiting grooves are provided on both sides of the bottom outer wall of the middle seat. A connecting buckle is inserted into the inner wall of the top of the upper cover, and the inner walls of both ends of the connecting buckle are engaged with two sets of limiting grooves.

3. A three-position key knob according to claim 2, characterized in that, A reset spring is fixedly installed on the inner wall of the gear shift lever, and the other end of the reset spring is fixedly connected to the inner wall of the base.

4. A three-position key knob according to claim 3, characterized in that, Oil injection holes are provided on both sides of the top of the upper cover. A plunger is engaged in the inner wall of the oil injection hole. A lubrication groove is provided on the inner wall of the top of the upper cover, and the lubrication groove is connected to the oil injection hole.

5. A three-position key knob according to claim 4, characterized in that, An outer shell is fixedly installed on the outer wall of the middle seat. The outer shell has external threads, and an installation nut engages with the outer shell. An O-ring is engaged between the installation nut and the outer shell.

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