CN218414313U - Pedal switch - Google Patents

Abstract

The application is applicable to medical instrument technical field, provides a foot switch, includes: bottom plate, locking subassembly, driving lever subassembly and main valve, the main valve includes: the locking mechanism comprises a valve body and a valve core assembly arranged in a cavity of the valve body, wherein the valve core assembly is provided with a first valve control position and a second valve control position, and the locking assembly, a deflector rod assembly and the valve body are arranged above a bottom plate; the output end of the deflector rod assembly is in driving connection with the valve core assembly so as to push the valve core assembly to be switched between the first valve control position and the second valve control position; the locking assembly locks the shift lever assembly when the valve core assembly moves to the first valve control position and/or the second valve control position. Through the locking positioning of locking subassembly with driving lever subassembly, make foot switch maintain under this state, need not to pedal always, can liberate doctor's foot, it is more convenient to use.

Description

Pedal switch

Technical Field

The application belongs to the technical field of medical equipment, and more specifically relates to a foot switch.

Background

The foot switch is an indispensable important device in the dental unit, and controls the drive of a dental handpiece, a three-way spray gun, a dental scaler and the like on the dental unit. At present, a common foot switch treads a cover plate through feet to drive a valve core device of the foot switch, so that the driving gas is opened and closed. In the process of diagnosis and treatment, the feet of a doctor need to be always positioned at the foot switch and continuously trample to enable the dental handpiece to be in a working state, so that the time for using the feet is long, the feet are easy to be stiff and fatigued, and the health of a body is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide a foot switch, aim at solving the problem that the foot switch among the prior art needs to be pedal continuously in the process of diagnosing and treating.

To achieve the above object, according to one aspect of the present application, there is provided a foot switch including: bottom plate, locking subassembly, driving lever subassembly and main valve, the main valve includes: the valve core assembly is arranged in a cavity of the valve body and provided with a first valve control position and a second valve control position, and the locking assembly, the deflector rod assembly and the valve body are arranged above the bottom plate; the output end of the deflector rod assembly is in driving connection with the valve core assembly so as to push the valve core assembly to be switched between a first valve control position and a second valve control position; the locking assembly locks the shift lever assembly when the spool assembly moves to the first valving position and/or the second valving position.

Optionally, the locking assembly comprises a support, the support is arranged above the bottom plate, and a first clamping mechanism is arranged on the support; the deflector rod assembly comprises a deflector rod, and a second clamping mechanism is arranged on the deflector rod; and under the condition that the valve core assembly moves to the first valve control position and/or the second valve control position, the first clamping mechanism is clamped with the second clamping mechanism.

Optionally, the first clamping mechanism comprises a locking pin, the support is provided with a first through hole, the locking pin is connected in the first through hole in a sliding manner, the second clamping mechanism comprises a clamping piece, the clamping piece is connected with the shifting lever, and the clamping piece is provided with a second through hole; when the second through hole moves to the position below the first through hole, the locking pin extends out of the first through hole and penetrates through the second through hole to limit the shifting lever to move.

Optionally, the first clamping mechanism further comprises a first spring and an adjusting screw, the adjusting screw is screwed above the first through hole, the first spring is installed in the first through hole, one end of the first spring abuts against the adjusting screw, and the other end of the first spring abuts against the locking pin; the joint spare includes: the locking device comprises a guide section, a locking section and a connecting section, wherein the locking section is connected between the guide section and the connecting section, the connecting section is connected with a shifting lever, the guide section is arranged in a downward inclined mode, and a second through hole is formed in the locking section, wherein the guide section is used for being abutted to a locking pin and pushing the locking pin to contract into the first through hole; the shifting lever is provided with an initial position, and one end of the locking pin extends out of the lower part of the first through hole under the condition that the shifting lever is located at the initial position.

Optionally, the shifter assembly further comprises: the fixing seat is arranged at an interval with the bottom plate; the first rotating shaft is arranged on the shifting rod and the fixed seat in a penetrating manner, and the fixed seat is fixedly connected with the shifting rod; the second rotating shaft is parallel to the bottom plate, penetrates through the first rotating shaft, is rotatably connected with the first rotating shaft, and is also fixedly connected with the fixed seat; the third rotating shaft penetrates through the first rotating shaft and is rotatably connected with the first rotating shaft, one end of the third rotating shaft is positioned below the second rotating shaft, and the other end of the third rotating shaft is connected with the bottom plate; and under the condition that the locking pin penetrates through the second through hole, downward pressure is applied to the shifting rod, so that the fixed seat rotates and drives the shifting rod to move downwards until the second through hole and the locking pin are released from clamping.

Optionally, the output end of the deflector rod assembly comprises a rotary seat, the rotary seats are arranged below the fixed seat at intervals, the first rotary shaft and the third rotary shaft penetrate through the rotary seats, the first rotary shaft is fixedly connected with the rotary seats, and the rotary seats are in driving connection with the valve core assembly; a first reset component is arranged between the rotary seat and the fixed seat and can drive the fixed seat to rotate upwards to reset after downward pressure disappears.

Optionally, a groove is formed in the top of the rotating seat, and a first resetting component is arranged in the groove.

Optionally, the foot switch further comprises a second reset assembly, the second reset assembly comprises a torsion spring and two reset columns, a flange extending towards the direction of the bottom plate is arranged at the bottom of the rotary seat, and the torsion spring is sleeved on the outer side wall of the flange; one of the two reset columns is fixed on the rotary seat, two torsion arms of the torsion spring are arranged on two sides of the first reset column in a crossed manner, and the other reset column is fixed above the bottom plate and positioned between the two torsion arms; under the circumstances that initial position was kept away from to the promotion driving lever, swivel mount drove one of two torque arms and rotates, and another torque arm with set up the post butt that resets on the bottom plate, make torsion spring have with swivel mount rotation opposite direction's torsion, under the circumstances of releasing the driving lever, torsion made swivel mount drive driving lever return to initial position.

Optionally, the bottom of the swivel base is provided with an anti-wear pad.

Optionally, a pushing flange unit is arranged on the rotary seat, the pushing flange unit abuts against one end, extending out of the inner cavity of the valve body, of the valve core assembly, and the pushing flange unit can rotate and push the valve core assembly to switch between the first valve control position and the second valve control position.

The application provides a foot switch's beneficial effect lies in: compared with the prior art, the shifting lever assembly is arranged above the bottom plate, the locking assembly is used for being clamped with the shifting lever assembly, the shifting lever assembly is controlled to switch between the first valve control position and the second valve control position by moving the shifting lever assembly, and when the valve core assembly moves to the first valve control position and/or the second valve control position, the shifting lever assembly can be locked and positioned by the locking assembly, so that the foot pedal switch is maintained in the state, the foot pedal is not needed, the foot of a doctor can be released, and the use is more convenient.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is an exploded view of a foot pedal according to an embodiment of the present application;

FIG. 2 is an exploded schematic view of a main valve provided in accordance with an embodiment of the present application;

FIG. 3 is a schematic illustration of a main valve provided in an embodiment of the present application in a first valving position;

FIG. 4 is a schematic diagram of a main valve in a second valving position (gas flow max) provided by an embodiment of the present application;

FIG. 5 is a schematic view of an initial state of a foot switch provided in an embodiment of the present application;

fig. 6 is a schematic view illustrating an operation state of the foot switch when the gas flow is maximum according to the embodiment of the present application.

Reference numerals referred to in the above figures are detailed below:

10. a base plate;

20. a locking assembly; 21. a support; 211. a first through hole; 22. a locking pin; 23. a first spring; 24. adjusting screws;

30. a deflector rod;

31. a clamping piece; 311. a second through hole; 312. a guide section; 313. a locking section; 314. a connecting section;

32. a fixed seat; 33. a first rotating shaft; 34. a second rotating shaft; 341. a sleeve;

35. a third rotating shaft; 351. a shaft sleeve; 352. a bearing;

36. rotating; 361. a groove; 362. a flange; 363. an anti-wear pad; 364. a first protrusion; 365. a second protrusion; 366. a first push flange; 367. a second push flange;

37. a first reset assembly; 371. a second spring;

38. a torsion spring; 39. a reset column;

40. a main valve;

41. a valve body; 411. an inner flange; 412. a first cavity; 413. a second cavity; 414. an intake passage; 415. a first air outlet channel; 416. a second air outlet channel;

42. a valve core assembly;

421. a top rod; 4211. a bearing mounting groove; 4212. a bearing; 4213. a connecting shaft; 4214. a first air escape hole;

422. a valve core; 4221. a control section; 4222. a drive section; 4223. a second air escape hole; 4224. a first seal ring;

423. a sealing plug;

424. a third spring; 425. a fourth spring; 426. a fifth spring;

43. a first nozzle; 44. a second nozzle; 45. a third nozzle; 46. a fourth nozzle; 47. a base; 48. a seal member; 481. and a second seal ring.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. The embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

As described in the background art, currently, in the course of diagnosis and treatment using a dental unit, a doctor needs to step on a foot pedal all the time to make a dental handpiece in a working state, so that the time for using the foot is long, and the foot is easy to be stiff and fatigued and affects the health of the body.

To solve the above problem, as shown in fig. 1, according to an aspect of the present application, an embodiment of the present application provides a foot switch including: bottom plate 10, locking subassembly 20, driving lever subassembly and main valve 40, main valve 40 includes: the locking device comprises a valve body 41 and a valve core assembly 42 arranged in a cavity of the valve body 41, wherein the valve core assembly 42 is provided with a first valve control position and a second valve control position, and the locking assembly 20, a deflector rod assembly and the valve body 41 are arranged above a bottom plate 10; the output end of the deflector rod assembly is in driving connection with the valve core assembly 42 so as to push the valve core assembly 42 to switch between the first valve control position and the second valve control position; with the valve core assembly 42 moved to the first valving position and/or the second valving position, the detent assembly 20 detents the toggle lever assembly.

In one embodiment, the driving lever assembly has two ends, one of which is an input end, and the other of which is an output end, and the output end can drive the valve core assembly 42 to move linearly in the inner cavity of the valve body 41. When the gas valve core assembly 42 is in operation, the input end is moved, so that the output end pushes the valve core assembly 42 to move along the axial direction, when the valve core assembly 42 reaches the second valve control position from the first valve control position, the gas flow is maximum, and at the moment, the input end of the deflector rod assembly is locked and positioned by the locking assembly 20, so that the valve core assembly 42 is maintained at the second valve control position. It should be noted that, a plurality of locking assemblies 20 may be provided, so that when the valve core assembly 42 is located at the first valve control position or the second valve control position, the lever assembly can be locked by the locking assemblies 20.

Compared with the prior art, this application passes through the driving lever subassembly and is connected with case subassembly 42 drive, realizes the rectilinear motion through driving lever subassembly control case subassembly 42, simultaneously through setting up locking subassembly 20 on bottom plate 10, and then realizes the locking location to the driving lever subassembly, makes operating personnel need not to maintain pedal state, and it is more convenient to use. It should be noted that the drive connection in the embodiment of the present application includes a direct connection having a drive relationship and also includes an abutment having a drive relationship.

Referring to fig. 1, the locking assembly 20 in the present embodiment includes a support 21, the support 21 is disposed above the bottom plate 10, and a first clamping mechanism is disposed on the support 21; the deflector rod assembly comprises a deflector rod 30, and a second clamping mechanism is arranged on the deflector rod 30; when the valve core assembly 42 moves to the first valve control position and/or the second valve control position, the first clamping mechanism is clamped with the second clamping mechanism. The support 21 in this embodiment may be fixed above the base plate 10 by screws. Wherein, the support 21 is a cylindrical body with round or square shape.

In one embodiment, the first engaging mechanism is a slot disposed on the support 21, an opening of the slot faces the second engaging mechanism, and the second engaging mechanism is a block disposed on the shift lever 30, and the block can be engaged with the slot.

Referring to fig. 1, the first clamping mechanism in this embodiment includes a locking pin 22, a first through hole 211 is formed in a support 21, the locking pin 22 is slidably connected in the first through hole 211, the second clamping mechanism includes a clamping member 31, the clamping member 31 is connected to a shift lever 30, and a second through hole 311 is formed in the clamping member 31; when the second through hole 311 moves to a position below the first through hole 211, the locking pin 22 extends out of the first through hole 211 and passes through the second through hole 311, so as to limit the movement of the shift lever 30.

It can be understood that locking pin 22 can extend and contract in first through hole 211, and shift lever 30 can drive second through hole 311 to move, and when second through hole 311 aligns with first through hole 211, locking pin 22 stretches out first through hole 211 and stretches into second through hole 311, makes support 21 and shift lever 30 fixed connection, realizes stopping the location to the card of shift lever 30.

Referring to fig. 1, the first latch mechanism in this embodiment further includes a first spring 23 and an adjusting screw 24, the adjusting screw 24 is screwed above the first through hole 211, the first spring 23 is installed in the first through hole 211, one end of the first spring 23 abuts against the adjusting screw 24, and the other end of the first spring 23 abuts against the locking pin 22; the clip 31 includes: the locking section 313 is connected between the guide section 312 and the connecting section 314, the connecting section 314 is connected with the shift lever 30, the guide section 312 is arranged in a downward inclined manner, the second through hole 311 is formed in the locking section 313, and the guide section 312 is used for abutting against the locking pin 22 and pushing the locking pin 22 to retract into the first through hole 211; the shift lever 30 has an initial position in which one end of the lock pin 22 protrudes below the first through hole 211.

In one embodiment, the supporting base 21 is provided with a clamping end and a fixed end, the fixed end is fixedly connected with the bottom plate 10, the clamping end is arranged at an interval with the bottom plate 10, the first through hole 211 is arranged at the clamping end, the opening direction of the first through hole 211 is perpendicular to the bottom plate 10, wherein the distance from the locking section 313 to the bottom plate 10 is smaller than the distance from the bottom of the clamping end to the bottom plate 10; in the case where the striker 22 protrudes from the first through hole 211, the distance from the locking section 313 to the bottom plate 10 is larger than the distance from the lower end of the striker 22 to the bottom plate 10, and the distance from the end of the guide section 312 for abutting against the striker 22 to the bottom plate 10 is smaller than the distance from the lower end of the striker 22 to the bottom plate 10. Move driving lever 30 and make joint piece 31 be close to support 21, when direction section 312 and locking pin 22 lower extreme butt, continue to move driving lever 30, direction section 312 exerts ascending pressure to locking pin 22, makes locking pin 22 compress first spring 23 and removes in to first through-hole 211, when locking section 313 moves to joint end below and first through-hole 211 aligns with second through-hole 311, locking pin 22 lower extreme is unblocked, and locking pin 22 stretches out first through-hole 211 downwards and wears to locate second through-hole 311 under the elastic force effect of first spring 23.

Referring to fig. 1, the shift lever assembly in this embodiment further includes: the fixing seat 32, the first rotating shaft 33, the second rotating shaft 34 and the third rotating shaft 35 are arranged at intervals between the fixing seat 32 and the bottom plate 10; the first rotating shaft 33 penetrates through the shifting rod 30 and the fixed seat 32, and the fixed seat 32 is fixedly connected with the shifting rod 30; the second rotating shaft 34 is parallel to the bottom plate 10, passes through the first rotating shaft 33, is rotatably connected with the first rotating shaft 33, and is also fixedly connected with the fixed seat 32; the third rotating shaft 35 penetrates through the first rotating shaft 33 and is rotatably connected with the first rotating shaft 33, one end of the third rotating shaft 35 is positioned below the second rotating shaft 34, and the other end of the third rotating shaft 35 is connected with the bottom plate 10; under the condition that the locking pin 22 penetrates through the second through hole 311, downward pressure is applied to the shift lever 30, so that the fixed seat 32 rotates and drives the shift lever 30 to move downwards until the second through hole 311 is disengaged from the locking pin 22. Specifically, under the condition that the locking pin 22 penetrates through the first through hole 211 and the second through hole 311, downward pressure is applied to the shift lever 30, and the second rotating shaft 34 drives the fixing seat 32 and the shift lever 30 to rotate downward, so that the clamping member 31 moves downward until the second through hole 311 is separated from the locking pin 22, and at this time, the shift lever 30 can be moved out of the clamping end. Wherein, the second shaft 34 is sleeved with a sleeve 341 for protecting the second shaft 34 to prevent damage, and the sleeve 341 is made of plastic material; the shifting rod 30 is rotatably connected above the bottom plate 10 through the fixed seat 32, and the shifting rod 30 can rotate towards two sides of the initial position, so that two sides of the shifting rod 30 are respectively provided with a locking assembly 20, and when the shifting rod 30 rotates towards any side, the shifting rod 30 can be clamped and positioned with the locking assemblies 20 positioned on the same side; furthermore, a locking assembly 20 may be provided at the initial position to ensure that the shift lever 30 is at the initial position, avoiding displacement.

Optionally, the first rotating shaft 33 in this embodiment is spaced from the bottom plate 10 to reduce friction between the first rotating shaft 33 and the bottom plate 10, and ensure smooth rotation.

Referring to fig. 1, an output end of the shift lever assembly in this embodiment includes a rotation base 36, the rotation base 36 is disposed below the fixing base 32 at intervals, the first rotation shaft 33 and the third rotation shaft 35 are disposed in the rotation base 36 in a penetrating manner, the first rotation shaft 33 is fixedly connected to the rotation base 36, and the rotation base 36 is in driving connection with the valve core assembly 42; a first reset component 37 is arranged between the rotating seat 36 and the fixed seat 32, and the first reset component 37 can drive the fixed seat 32 to rotate upwards for resetting after the downward pressure disappears.

It should be noted that the first rotating shaft 33 sequentially penetrates through the shift lever 30, the fixing seat 32 and the rotating seat 36 from top to bottom, wherein a shaft sleeve 351 and a bearing 352 are sleeved on the third rotating shaft 35, and the bearing 352 is located below the shaft sleeve 351, so that the third rotating shaft 35 is rotatably connected with the first rotating shaft 33. Because the first reset assembly 37 is arranged between the rotating seat 36 and the fixed seat 32, downward pressure is applied to the shifting rod 30, the fixed seat 32 compresses the first reset assembly 37 downward, so that the first reset assembly 37 has upward elastic force, and after the pressure applied to the shifting rod 30 disappears, the first reset assembly 37 can drive the fixed seat 32 and the shifting rod 30 to move upward for resetting. The first restoring assembly 37 in this embodiment includes two second springs 371, and two ends of the second springs 371 abut against the rotary base 36 and the fixing base 32, respectively. When the second through hole 311 is disengaged from the locking pin 22, the shift lever 30 is moved out of the engagement end and the shift lever 30 is released, and at this time, the two second springs 371 drive the fixing base 32 to move upward under the action of elastic force.

Referring to fig. 1, the top of the rotary base 36 in this embodiment is provided with a groove 361, and the first restoring assembly 37 is disposed in the groove 361. By providing the groove 361, the first reset assembly 37 can be restricted from shifting, and the structural stability can be ensured.

Referring to fig. 1, the foot switch in this embodiment further includes a second reset assembly, the second reset assembly includes a torsion spring 38 and two reset columns 39, a flange 362 extending toward the bottom plate 10 is disposed at the bottom of the rotary seat 36, and the torsion spring 38 is sleeved on an outer side wall of the flange 362; of the two reset columns 39, one of the two reset columns 39 is fixed on the rotary seat 36, and two torsion arms of the torsion spring 38 are arranged on two sides of the reset column 39 in a crossed manner, and the other reset column 39 is fixed above the bottom plate 10 and positioned between the two torsion arms; under the condition that the shifting lever 30 is pushed to be away from the initial position, the rotating seat 36 drives one of the two torsion arms to rotate, the other torsion arm is abutted against a reset column 39 arranged on the bottom plate 10, so that the torsion spring 38 has torsion opposite to the rotating direction of the rotating seat 36, and under the condition that the shifting lever 30 is released, the rotating seat 36 drives the shifting lever 30 to return to the initial position through the torsion. The return post 39 fixed to the rotary base 36 abuts against the two torsion arms of the torsion spring 38, so that the two torsion arms of the torsion spring 38 are maintained to be crossed to generate an elastic force; when the shifting lever 30 is moved away from the preset initial position, the rotating base 36 rotates, one torsion arm of the torsion spring 38 rotates along with the rotating base 36, and the other torsion arm of the torsion spring 38 abuts against a reset column 39 fixed on the bottom plate 10, so that the torsion spring 38 has a torsion opposite to the rotating direction of the rotating base 36, and therefore, the shifting lever 30 is released, the rotating base 36 can automatically return to the preset initial position, and automatic reset is realized.

Referring to fig. 1, an anti-wear pad 363 is disposed at the bottom of the rotary seat 36 in this embodiment. An anti-abrasion pad 363 is adhered to the bottom of the rotary seat 36 to prevent the rotary seat 36 from being abraded due to friction between the rotary seat 36 and the bottom plate 10.

Referring to fig. 1, the rotary seat 36 in this embodiment is provided with a pushing flange unit, which abuts against one end of the valve core assembly 42 extending out of the inner cavity of the valve body 41, and can rotate and push the valve core assembly 42 to switch between the first valving position and the second valving position. Specifically, the pushing flange unit includes a first pushing flange 366 and a second pushing flange 367 which are arranged on the rotating base 36 at intervals, in this embodiment, the first pushing flange 366 and the second pushing flange 367 are symmetrically arranged on the side portion of the rotating base 36, and the first pushing flange 366 and the second pushing flange 367 are connected to form a V-shaped structure with a lower middle and two higher sides at the edge of the pushing flange unit. In addition, the first pushing flange 366 is provided with a first protrusion 364, and the second pushing flange 367 is provided with a second protrusion 365, so that when the valve core assembly 42 is in the second valve control position, the first protrusion 364 or the second protrusion 365 can block the end of the valve core assembly 42 to limit the relative rotation between the valve core assembly 42 and the rotary seat 36.

Referring to fig. 2 to 4, in the present embodiment, the cavity of the valve body 41 is provided with an inner flange 411, the inner flange 411 divides the inner cavity of the valve body 41 into a first cavity 412 and a second cavity 413 which are communicated with each other, the valve body 41 is provided with an air inlet channel 414 and a first air outlet channel 415, the air inlet channel 414 is communicated with the first cavity 412, and the first air outlet channel 415 is communicated with the second cavity 413; the valve core assembly 42 includes: the valve spool 422, the valve spool 422 is slidably connected in the first and second chambers 412, 413. Specifically, the valve body 41 is fixed above the base plate 10 through the base 47, the first nipple 43 is connected to the air inlet channel 414, the second nipple 44 is connected to the first air outlet channel 415, and in the process that the valve core assembly 42 moves from the first valve control position to the second valve control position, along with the movement of the valve core 422, the first cavity 412 and the second cavity 413 are communicated, so that the external air flows in through the first nipple 43 and flows out through the second nipple 44.

Referring to fig. 3 and 4, the valve spool 422 in the present embodiment has a control section 4221, the control section 4221 has a conical structure having a diameter gradually decreasing in a direction from the first cavity 412 to the second cavity 413, and the control section 4221 is configured to cooperate with an inner wall of the inner flange 411 to adjust a gas flow rate in the valve body 41. Specifically, in the process that the valve core assembly 42 moves from the first valve control position to the second valve control position, the control section 4221 moves towards the first cavity 412 to enable the first cavity 412 and the second cavity 413 to be communicated, along with the movement of the valve core 422, the gas entering the inner flange 411 through the control section 4221 is gradually increased, the gas flow provided by the valve core 422 is gradually increased until the control section 4221 is completely moved into the first cavity 412, and at the moment, the gas flow is maximum; conversely, the gas flow rate gradually decreases. Note that the number of first air outlet passages 415 is plural. In this embodiment, two first air outlet channels 415 are provided, and are respectively connected to the second nozzle 44 and the third nozzle 45. By providing a plurality of first outlet channels 415 in communication with second cavity 413, connection of a plurality of dental handpieces or other devices may be supported.

The valve body 41 in this embodiment is further provided with a second air outlet passage 416, and the second air outlet passage 416 is communicated with the first cavity 412; with spool assembly 42 switched between the first and second valving positions, inlet passage 414 communicates with second outlet passage 416. The second air outlet passage 416 in this embodiment is connected to the fourth nozzle 46, the working device connected to the fourth nozzle 46 is provided with a separate on/off control switch, and the second air outlet passage 416 is suitable for a situation where the working flow does not need to be adjusted, so that the foot switch in this embodiment can meet the requirements of various application devices.

The two ends of the cavity of the valve body 41 in this embodiment are provided with a first opening and a second opening, the first opening is located in the first cavity 412, the second opening is located in the second cavity 413, and the first opening is sealed by the sealing member 48; the valve core assembly 42 further comprises a sealing plug 423 and a top rod 421; a sealing plug 423 slidably connected to the first cavity 412; and a push rod 421 slidably connected to the second chamber 413, one end of the push rod 421 being connected to the valve element 422, and the other end of the push rod 421 abutting against the push flange unit.

A third spring 424 is arranged between the sealing plug 423 and the sealing piece 48 in the embodiment, and two ends of the third spring 424 are respectively abutted against the sealing plug 423 and the sealing piece 48; the valve core 422 is provided with a driving section 4222 connected with a control section 4221, wherein one end of the driving section 4222 close to the inner flange 411 is provided with a fourth spring 425 for resetting the valve core 422, and the fourth spring 425 is abutted against the inner flange 411; a fifth spring 426 is arranged between one end of the driving section 4222 close to the top rod 421 and the top rod 421, and the fifth spring 426 can realize soft connection between the valve core 422 and the top rod 421. When the valve core assembly 42 is in the first valve control position, the sealing plug 423 is attached to the inner flange 411 and is spaced from the control section 4221, so that the first cavity 412 is not communicated with the second cavity 413, no gas is output from the second nozzle 44 and the third nozzle 45, the valve core 422 is moved from the second cavity 413 to the first cavity 412 by pushing the ejector rod 421, the control section 4221 of the valve core 422 pushes the sealing plug 423 to move in the direction of the sealing member 48, so that the first cavity 412 is communicated with the second cavity 413, at this time, gas is output from the second nozzle 44 and the third nozzle 45, and when the valve core assembly 42 is in the second valve control position, that is, the control section 4221 is completely located in the first cavity 412, and the gas flow passing through the control section 4221 is maximum.

A first sealing ring 4224 is sleeved on the driving section 4222 of the valve core 422 in the embodiment, and the first sealing ring 4224 is used for sealing the second cavity 413; the sealing member 48 is fitted with a second sealing ring 481, and the second sealing ring 481 is used for sealing the first cavity 412. Wherein, the sealing member 48 is a sealing silica gel plug, and is fixedly connected with the valve body 41 through a sealing screw, and the sealing silica gel plug can be installed and replaced by detaching the sealing screw, so that the structure is simple and the detachment is convenient.

In this embodiment, a bearing installation groove 4211 is provided at one end of the push rod 421 abutting against the push flange unit, a bearing 4212 is provided in the bearing installation groove 4211, the bearing 4212 is rotatably connected in the bearing installation groove 4211 through a connecting shaft 4213, the bearing 4212 abuts against the push flange unit, and the push flange unit pushes the bearing 4212 to further push the push rod 421 to push the valve core 422 to move in the valve body 41. It should be noted that friction can be reduced by providing the bearing 4212 in rotational connection with the pushing flange unit. Among them, the bearing 4212 is a sliding bearing. The opening direction of the bearing mounting groove 4211 faces the pushing flange unit, and the slide bearing rotates about the connecting shaft 4213.

In this embodiment, the top rod 421 is provided with a first venting hole 4214 penetrating along the axial direction, the valve core 422 is provided with a second venting hole 4223 penetrating along the axial direction, and the first venting hole 4214 and the second venting hole 4223 are communicated with the inner cavity of the valve body 41. When the valve core assembly 42 is in the first valve control position, the sealing plug 423 seals the first cavity 412, the control section 4221 and the sealing plug 423 are arranged at an interval, and the inner flange 411 and the second cavity 413 are exhausted outwards through the first air release hole 4214 and the second air release hole 4223; when the valve core assembly 42 is in the second valve control position, the control section 4221 is arranged in abutment with the sealing plug 423, and the first air release hole 4214 and the second air release hole 4223 are not communicated with the cavity of the valve body 41.

Referring to fig. 5, in the case that the shift lever 30 in the present embodiment is in the initial position, the pushing flange unit does not push the valve core assembly 42, and the valve core assembly 42 is in the first valving position; referring to fig. 6, the toggle lever 30 is away from the initial position, and the flange unit pushes the valve core assembly 42 to the second valve control position, which is the position with the maximum gas flow in the working state.

In summary, the pedal switch provided in the embodiment at least has the following beneficial effects:

(1) The locking assembly 20 is arranged in the rotating direction of the shifting rod 30, so that the shifting rod 30 is fixed, an operator does not need to maintain a pedal state, and the use is more convenient.

(2) By arranging the first reset assembly 37 and the second reset assembly, the automatic unlocking and resetting of the shift lever 30 and the locking assembly 20 can be realized.

(3) The deflector rod assembly is rotationally connected with the valve core assembly 42, so that the rotary motion of the deflector rod assembly is converted into the linear motion of the valve core assembly 42, and the gas flow in the valve core assembly 42 is accurately regulated and controlled by the deflector rod 30.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims (10)

1. A foot switch, comprising: bottom plate (10), locking subassembly (20), driving lever subassembly and main valve (40), main valve (40) include: the locking device comprises a valve body (41) and a valve core assembly (42) arranged in a cavity of the valve body (41), wherein the valve core assembly (42) is provided with a first valve control position and a second valve control position, and the locking assembly (20), the deflector rod assembly and the valve body (41) are arranged above the bottom plate (10);

the output end of the deflector rod assembly is in driving connection with the valve core assembly (42) so as to push the valve core assembly (42) to be switched between the first valve control position and the second valve control position;

the latch assembly (20) latches the toggle assembly when the spool assembly (42) is moved to the first valving position and/or the second valving position.

2. The foot switch according to claim 1, characterized in that the locking assembly (20) comprises a support (21), the support (21) being arranged above the base plate (10), the support (21) being provided with a first snap-in mechanism; the shifting lever assembly comprises a shifting lever (30), and a second clamping mechanism is arranged on the shifting lever (30); and under the condition that the valve core assembly (42) moves to the first valve control position and/or the second valve control position, the first clamping mechanism is clamped with the second clamping mechanism.

3. The foot switch according to claim 2, wherein the first latch mechanism comprises a locking pin (22), the support (21) is provided with a first through hole (211), the locking pin (22) is slidably connected in the first through hole (211), the second latch mechanism comprises a latch member (31), the latch member (31) is connected with the shift lever (30), and the latch member (31) is provided with a second through hole (311);

when the second through hole (311) moves below the first through hole (211), the locking pin (22) extends out of the first through hole (211) and penetrates through the second through hole (311) to limit the shifting lever (30) to move.

4. The foot switch according to claim 3, characterized in that the first snap-in mechanism further comprises a first spring (23) and an adjusting screw (24), the adjusting screw (24) is screwed above the first through hole (211), the first spring (23) is installed in the first through hole (211), one end of the first spring (23) abuts against the adjusting screw (24), and the other end of the first spring (23) abuts against the locking pin (22);

the clip (31) includes: the locking device comprises a guide section (312), a locking section (313) and a connecting section (314), wherein the locking section (313) is connected between the guide section (312) and the connecting section (314), the connecting section (314) is connected with the shift lever (30), the guide section (312) is arranged in a downward inclined mode, the second through hole (311) is arranged in the locking section (313), and the guide section (312) is used for being abutted to the locking pin (22) and pushing the locking pin (22) to retract into the first through hole (211);

the shift lever (30) has an initial position, and one end of the locking pin (22) protrudes below the first through hole (211) when the shift lever (30) is in the initial position.

5. The foot switch of claim 4, wherein the shifter assembly further comprises: the rotating mechanism comprises a fixed seat (32), a first rotating shaft (33), a second rotating shaft (34) and a third rotating shaft (35), wherein the fixed seat (32) and the bottom plate (10) are arranged at intervals;

the first rotating shaft (33) penetrates through the fixed seat (32), and the fixed seat (32) is fixedly connected with the shifting rod (30);

the second rotating shaft (34) is parallel to the bottom plate (10), penetrates through the first rotating shaft (33), is rotatably connected with the first rotating shaft (33), and is also fixedly connected with the fixed seat (32);

the third rotating shaft (35) penetrates through the first rotating shaft (33) and is rotatably connected with the first rotating shaft (33), one end of the third rotating shaft (35) is positioned below the second rotating shaft (34), and the other end of the third rotating shaft (35) is connected with the bottom plate (10);

and under the condition that the locking pin (22) penetrates through the second through hole (311), downward pressure is applied to the shifting rod (30), so that the fixed seat (32) rotates and drives the shifting rod (30) to move downwards until the second through hole (311) and the locking pin (22) are released from clamping.

6. The foot switch of claim 5, wherein the output end of the toggle lever assembly comprises a rotary seat (36), the rotary seat (36) is disposed below the fixed seat (32) at an interval, the first rotary shaft (33) and the third rotary shaft (35) are disposed in the rotary seat (36) in a penetrating manner, the first rotary shaft (33) is fixedly connected with the rotary seat (36), and the rotary seat (36) is in driving connection with the valve core assembly (42);

a first resetting component (37) is arranged between the rotary seat (36) and the fixed seat (32), and the first resetting component (37) can drive the fixed seat (32) to rotate upwards to reset after the downward pressure disappears.

7. The foot switch according to claim 6, characterized in that a recess (361) is provided on the top of the rotary seat (36), the first reset assembly (37) being provided in the recess (361).

8. The foot switch according to claim 6, characterized in that the foot switch further comprises a second reset assembly, the second reset assembly comprises a torsion spring (38) and two reset columns (39), a flange (362) extending towards the bottom plate (10) is arranged at the bottom of the rotary seat (36), and the torsion spring (38) is sleeved on the outer side wall of the flange (362);

one of the two reset columns (39) is fixed on the rotary seat (36), two torsion arms of the torsion spring (38) are arranged on two sides of the reset column (39) in a crossed mode, and the other reset column (39) is fixed above the bottom plate (10) and located between the two torsion arms;

under the condition that promote driving lever (30) keep away from the initial position, swivel mount (36) drive two one of the torque arm rotates, another the torque arm with set up on bottom plate (10) return post (39) butt, make torsion spring (38) have with swivel mount (36) rotate the opposite torsion of direction, under the condition of releasing driving lever (30), torsion makes swivel mount (36) drive driving lever (30) return to the initial position.

9. The foot switch according to claim 6, characterized in that a wear pad (363) is provided at the bottom of the rotary seat (36).

10. The foot switch according to claim 6, characterized in that a pushing flange unit is provided on the swivel seat (36) and abuts against an end of the valve core assembly (42) protruding out of the inner cavity of the valve body (41), the pushing flange unit being capable of rotating and pushing the valve core assembly (42) to switch between the first and second valving positions.

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