TW202200321A - Trigger switch does not need to screw when the shift lever is assembled to the housing seat unit - Google Patents

Abstract

A trigger switch comprises a housing seat unit, a control unit, and a steering unit. The housing seat unit comprises a first housing seat and a second housing seat mutually aligning to each other. The first housing seat and the second housing seat are cooperated to define a pivot groove. The control unit comprises a circuit board, a conductive sliding seat set, a trigger set, and a magnetic induction set. The conductive sliding seat set can move relative to the circuit board and has a plurality of conductive contact springs electrically connected to the circuit board. The trigger set is used to drive the conductive sliding seat set to move. The magnetic induction set has a Hall element and a magnetic element that moves in accordance with the conductive sliding seat set. The steering unit comprises a shift lever pivotally arranged in the pivot groove. The shift lever is integrally formed and has a pivot shaft pivoted in the pivot groove and a steering contact spring capable of being elastically pressed to contact the circuit board.

Description

trigger switch

The present invention relates to a trigger switch, in particular to a trigger switch of an electric tool.

General power tools will use trigger switches and circuit design to turn on and off, and to control the speed and adjust the steering.

As shown in FIG. 1 and FIG. 2, an existing trigger switch 1 includes a housing base 11, a pressable trigger 12, a push shaft 13 connected to the trigger 12 and passing through the housing base 11, a The circuit board 14 in the housing 11 , and a steering device 15 rotatably disposed on the housing 11 . One end of the push shaft 13 adjacent to the circuit board 14 is provided with a conductive elastic piece (not shown) that can be electrically connected to the circuit board 14 . By pressing or releasing the trigger 12 , the push shaft 13 and the circuit board 14 can be changed. The relative position of the power tool can generate different electronic signals such as power-on, power-off and resistance changes, thereby controlling the operation of the power tool.

The steering device 15 is used to change the rotation direction of the power tool. The steering device 15 has a driving arm 151 and a rotating arm 152. The driving arm 151 is used to drive a conductive spring (not shown) to rotate relative to the circuit board 14 , to generate an electronic signal of forward rotation or reverse rotation. The rotating arm 152 is screwed to the driving arm 151 by a screw 153. The user only needs to turn the rotating arm 152 to the left or to the right to achieve the conversion of electric power. The effect of the direction of rotation of the tool.

Although the trigger switch 1 has the above-mentioned characteristics, after the steering device 15 is repeatedly rotated for a period of time, the screw 153 may be loosened, resulting in an unstable combination of the driving arm 151 and the rotating arm 152. The torque cannot be transmitted smoothly, and therefore, the durability is poor.

Therefore, the purpose of the present invention is to provide a trigger switch with higher durability.

Therefore, the trigger switch of the present invention is suitable for being installed in a power tool, and the trigger switch includes a housing unit, a control unit and a steering unit.

The shell base unit includes a first shell base and a second shell base which are opposite to each other, the first shell base and the second shell base cooperate to define an accommodating space, a accommodating space connected to the accommodating space and along the A sliding hole extending in the front-rear direction, and a pivot slot extending along a top-bottom direction, the housing unit has a mounting portion located in the accommodating space and opposite to the sliding hole at intervals.

The control unit is operably arranged on the housing base unit, and the control unit includes a circuit board, a conductive sliding seat group, a trigger group and a magnetic induction group.

The circuit board is arranged in the accommodating space, and the circuit board has several metal strips on the upper surface for controlling the rotation direction of the power tool, and several metal strips on the lower surface for controlling the operation of the power tool Conductive tape. The conductive sliding seat group is located in the accommodating space and can move relative to the circuit board along the front-rear direction, and the conductive sliding seat group has a plurality of conductive elastic pieces for electrically connecting with the conductive strips. The trigger set can be pressed on the housing unit and used to drive the conductive slide set to move. The trigger set has a push shaft passing through the sliding hole and connected to the conductive slide set, and a A reset elastic member compressively arranged between the push shaft and the mounting portion. The magnetic induction group has a hall element electrically connected to the circuit board, and a magnetic element arranged opposite to the hall element and moving with the conductive sliding seat group.

The steering unit is operably disposed on the housing base unit, the steering unit includes a lever pivotally disposed in the pivot slot, and a lever disposed on the lever and capable of being elastically contacted with the circuit board. For the turning elastic piece of the metal belt, the lever is integrally formed and has a pivot shaft pivoted in the pivot groove.

The effect of the present invention is that: the present invention is pivotally arranged in the pivot groove through the pivot shaft, when the lever is assembled to the housing base unit, no screw connection is required, and the lever is integrally formed with the design , can improve the structural strength and prolong the service life, therefore, the present invention has higher durability.

Referring to FIGS. 3 and 4 , an embodiment of the trigger switch of the present invention is suitable for being installed in a power tool (not shown), and the power tool can be a screwdriver, an electric drill or other tools with a rotating function. The trigger switch is used to control the power tool on and off, and to adjust the rotational speed and steering. The trigger switch includes a housing unit 2 , a control unit 3 and a steering unit 4 .

Referring to FIGS. 4 to 6 , the housing unit 2 includes a first housing 21 and a second housing 22 which are opposite to each other along a left-right direction X. The first housing 21 and the second housing 22 are in phase with each other. Cooperatively defines an accommodating space 200, a sliding hole 201 connected to the accommodating space 200 and extending along a front-rear direction Y, a top-bottom direction Z higher than the sliding hole 201 and communicating with the accommodating space The pivot groove 20 of 200, and a glue filling chamber 203 communicated with the accommodating space 200 and the outside world. The sliding hole 201 has a groove portion 204 all around. The pivot slot 20 extends along the top-bottom direction Z and both ends of the top and bottom are closed. The pivot slot 20 has a pivot section 205 and an inner diameter higher than the pivot section 205 A dustproof section 206 with a diameter of 206, and a hollow section 207 higher than the dustproof section 206.

In this embodiment, the first housing 21 has a support table 211 located in the accommodating space 200 , a chute 212 extending along the front-rear direction Y, and an installation adjacent to the rear end of the chute 212 The support table 211 is higher than the chute 212 and the mounting portion 213 and has a contact block 214 . The mounting portion 213 is spaced apart from the sliding hole 201 in the front-rear direction Y. Preferably, the mounting portion 213 is a groove. More preferably, the gluing chamber 203 is formed in the first housing 21 , and the gluing chamber 203 is located below the mounting portion 213 . The second housing 22 has a sliding slot 221 opposite to the sliding slot 212 of the first housing 21 in the left-right direction X.

The control unit 3 is operably disposed on the housing unit 2 and used to control the operation of the power tool. The control unit 3 includes a circuit board 31 , a cable 32 , a conductive slide group 33 , a trigger group 34 and a magnetic induction group 37 . The circuit board 31 is disposed in the accommodating space 200 and fixed on the bottom side of the support table 211 , and the circuit board 31 is used to control the operation and rotation direction of the power tool. The cable 32 is connected to the circuit board 31 and passes through the potting chamber 203 and passes through the housing unit 2. By filling the potting chamber 203 with potting glue, the cable 32 can be positioned and avoid The flat cable 32 is pulled off or broken by external force.

Referring to FIGS. 5 to 7 , the conductive sliding seat group 33 is slidably disposed in the accommodating space 200 and can move relative to the circuit board 31 along the front-rear direction Y, and the conductive sliding seat group 33 has a sliding seat 35 , and two conductive elastic sheets 36 that can be elastically disposed on the sliding seat 35 and used to contact the lower surface of the circuit board 31 , and the conductive elastic sheets 36 move with the sliding seat 35 . The sliding seat 35 has a groove 350 that is open front and rear and has an open top side, two mounting grooves 351 adjacent to the groove 350 and located at the top end for the conductive elastic pieces 36 to be installed respectively. The sliding blocks 352 are slidably disposed on both sides of the sliding grooves 212 and 221 , a shaft channel 353 running through the front and rear and between the sliding blocks 352 , and a molding 354 surrounding the shaft channel 353 . Each of the mounting slots 351 has a slot bottom surface 355 , an upper opening 356 opposite to the respective slot bottom surface 355 at a distance, and a front opening 357 communicating with the upper opening 356 . Each of the conductive elastic pieces 36 has a conducting section 361 for abutting against the lower surface of the circuit board 31 , two connecting sections 362 respectively located on opposite sides of the conducting section 361 , and two connecting sections 362 respectively connected to the connections. The inner hook segment 363 of the segment 362 and the conducting segment 361 are located above the respective upper openings 356 . The inner hook segments 363 extend toward each other and are accommodated in the respective installation grooves 351 . One of the inner hook segments 363 is lower than the other inner hook segment 363 and abuts against the corresponding groove bottom surface 355 , preferably, The conductive elastic pieces 36 are integrally connected and connected to each other. Since the inner hook segments 363 of each conductive elastic sheet 36 are accommodated in the respective installation slots 351, and one of the inner hook segments 363 abuts against the corresponding groove bottom surface 355, each conductive elastic sheet can be improved. The contact between 36 and the circuit board 31 is qualitative, so as to avoid the problem of disconnection caused by the vibration of the power tool under high-speed rotation.

The trigger set 34 can be pressed on the housing unit 2 and used to drive the conductive slide set 33 to move. The trigger set 34 has a trigger 341 for pressing, a trigger 341 connected to the conductive slide set 33 , a push shaft 342 , a reset elastic member 343 compressibly disposed between the push shaft 342 and the mounting portion 213 , and a dust-proof ring 344 . Preferably, the trigger 341 and the push shaft 342 are integrally formed, and the push shaft 342 is slidably inserted through the sliding hole 201 .

Referring to FIGS. 4 , 5 and 7 , preferably, a semi-circular arc-shaped insert groove 345 is formed on the outer peripheral surface of the push shaft 342 , and the insert groove 345 is arranged at an end opposite to the trigger 341 and is used for The molding strip 354 of the sliding seat 35 is embedded, so that the sliding seat 35 can be stably assembled on the pushing shaft 342 . The restoring elastic member 343 is a compression spring. Preferably, a concave annular groove 346 is formed on the end surface of the pushing shaft 342 facing the mounting portion 213 , and one end of the restoring elastic member 343 is accommodated in the annular groove. 346 and the other end pushes against the mounting portion 213 , when the trigger 341 is pressed and the push shaft 342 drives the conductive sliding block 33 to move in the direction of the mounting portion 213 , the reset elastic member 343 is squeezed to A potential energy that constantly resets the push shaft 342 is generated. The dustproof ring 344 is inserted into the groove portion 204 of the sliding hole 201 and positioned in the sliding hole 201 , the dustproof ring 344 is slidably contacted by the push shaft 342 , and the dustproof ring 344 prevents dust and foreign objects from entering the sliding hole 201 . The dustproof effect of the sliding hole 201, and the design of the dustproof ring 344 built into the sliding hole 201, can reduce the resistance when the trigger group 34 is actuated, so that the user can press it easily. Therefore, the operation of this embodiment is Feel better.

The magnetic induction group 37 has a hall element 371 electrically connected to the circuit board 31 , and a magnetic element 372 disposed opposite to the hall element 371 and moving with the conductive slide group 33 . In this embodiment, the magnetic member 372 is disposed in the groove 350 of the sliding seat 35 , and the Hall element 371 is connected to the lower surface of the circuit board 31 and faces the magnetic member 372 . However, in other variations, the Hall element 371 and the magnetic element 372 can also be disposed at other positions, as long as the magnetic element 372 can move relative to the Hall element 371 .

Referring to FIGS. 3 to 5 , the steering unit 4 is operably disposed on the housing unit 2 . The steering unit 4 includes a lever 41 , a steering elastic piece 42 , a dustproof washer 43 and a positioning elastic piece 44 . The toggle lever 41 is pivotally disposed in the pivot slot 20 , the toggle lever 41 has a pivot shaft 411 pivoted in the pivot slot 20 , a toggle end 412 and a steering end 413 disposed oppositely, and a A positioning bump 410 located between the steering end 413 and the pivot 411 . The pivot shaft 411 is integrally formed and has a top shaft section 415 and a bottom shaft section 416 . The top shaft section 415 is located in the hollow section 207 , and the lever 41 is integrally formed with good structural strength. The toggle end 412 is used for the user to toggle so that the toggle lever 41 can rotate relative to the pivot slot 20 around the pivot shaft 411 .

The turning elastic piece 42 is disposed on the bottom side of the turning end 413 of the lever 41 and can be elastically contacted with the upper surface of the circuit board 31 . The turning elastic piece 42 is formed with two contacts for electrical connection with the circuit board 31 . point to control the direction of rotation of the power tool. The dust-proof washer 43 is sleeved on the pivot shaft 411 and accommodated in the dust-proof section 206 of the pivot groove 20 , thereby having a dust-proof effect. It should be noted that the dust-proof washer 43 can be stretched due to its elasticity. , the dust-proof washer 43 is sleeved by the toggle end 412 of the toggle lever 41 and moved toward the pivot shaft 411 to achieve positioning. The positioning elastic piece 44 is disposed on the support table 211 and between the abutting block 214 and the positioning protrusion 410 .

In the present invention, the pivot shaft 411 is pivotally arranged in the pivot groove 20, and the lever 41 is assembled on the housing seat by the way that the first housing seat 21 and the second housing seat 22 are matched with each other. Unit 2, therefore, does not require screw connections. At the same time, the use of the integrated design of the lever 41 can improve the structural strength and prolong the service life. Therefore, the present invention has high durability.

It should be noted that, in this embodiment, the dustproof ring 344 and the dustproof washer 43 are respectively arranged at the two actuation positions of the trigger group 34 and the lever 41 to improve the airtightness of this embodiment, and have Better dustproof effect.

Referring to FIG. 5 , FIG. 6 and FIG. 8 , the positioning elastic piece 44 has a plurality of recesses 441 arranged at intervals, and the positioning protrusion 410 has a pushing protrusion 418 facing the turning end 413 , and the pushing protrusion 418 is selective The lever 41 is positioned by snapping into one of the recesses 441 . The positioning bump 410 and the positioning elastic piece 44 are simple in structure and easy to assemble, and therefore, the manufacturing cost is low.

Referring to FIG. 8 to FIG. 10 , in this embodiment, the number of the recesses 441 is three. As shown in FIG. 8 , when the positioning protrusion 410 is snapped into the concave portion 441 in the middle, a convex rib 347 of the trigger 341 pushes against the toggle end 412 of the toggle lever 41 and cannot be pressed, so that the power tool cannot be pressed. in a non-rotating state. As shown in FIG. 9 , when the toggle end 412 of the toggle lever 41 is turned to the left, the positioning projection 410 is locked into the concave portion 441 on the right side, and there is no obstacle between the trigger 341 and the toggle lever 41 and can be pressed , and make the power tool in the forward rotation state. As shown in FIG. 10 , when the toggle end 412 of the lever 41 is turned to the right, the positioning projection 410 is locked into the recess 441 on the left side, and there is no obstacle between the trigger 341 and the lever 41 and can be pressed , and make the power tool in a state of reverse action.

5 , 11 and 12 , three metal strips 311 are formed on the upper surface of the circuit board 31 , and two conductive strips 312 are formed on the lower surface of the circuit board 31 , and the metal strips 311 are used for the steering elastic piece 42 is slidably contacted to control the direction of rotation of the power tool. The conductive strips 312 are used for slidably contacting the conductive elastic pieces 36, so as to control the power-on and power-off of the power tool.

Referring to FIG. 5 and FIG. 12 , when the trigger 341 is not pressed, the two conductive strips 312 are not conductive, and at this time, the switch signal of the circuit board 31 is not conductively output.

Referring to FIGS. 5 and 13 , when the trigger 341 is pressed, the conductive elastic pieces 36 will contact the conductive strips 312 respectively so that Pin1 and Pin2 are connected to each other, and the circuit board 31 outputs a switch signal.

In the present invention, by gradually pressing the trigger 341, the distance between the magnetic element 372 and the Hall element 371 can be reduced to change the resistance, so that the circuit board 31 can output a change signal, thereby adjusting the rotational speed of the power tool.

Referring to FIGS. 9 and 11 , to adjust the rotation direction of the power tool, turn the lever 41 to the left, the lever 41 will drive the steering shrapnel 42 to turn right, and make Pin3 and Pin5 conduct. The power tool is in the forward rotation state.

10 and 14, on the contrary, when the lever 41 is turned to the right, the lever 41 will drive the steering elastic piece 42 to turn to the left, making Pin7 and Pin5 conduct.

To sum up, in the trigger switch of the present invention, by pivoting the pivot shaft 411 to the pivot groove 20, the lever 41 can be assembled to the housing base unit 2 without screwing. Therefore, the durability of the present invention is improved. higher. At the same time, by using the design of the lever 41 being integrally formed, the structural strength can be improved and the service life can be prolonged, so the purpose of the present invention can be achieved indeed.

However, the above are only examples of the present invention, and should not limit the scope of implementation of the present invention. Any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the patent specification are still included in the scope of the present invention. within the scope of the invention patent.

2: Shell base unit 200: accommodating space 20: Pivot slot 201: Sliding hole 203: Glue filling room 204: groove part 205: Pivot Segment 206: Dust section 207: Hollow segment 21: The first shell seat 211: Support table 212: Chute 213: Installation Department 214: Abutment Block 22: The second shell seat 221: Chute 3: Control unit 31: circuit board 311: Metal Belt 312: Conductive tape 32: Cable 33: Conductive sliding seat group 34: Trigger Group 341: Trigger 342: Push axis 343: Reset elastic 344: Dust ring 345: Groove 346: Ring groove 347: Ribs 35: Sliding seat 350: Groove 351: Mounting slot 352: Slider 353: Axis channel 354: Fillet 355: Bottom of groove 356: upper opening 357: Front opening 36: Conductive shrapnel 361: Conduction segment 362: Connection segment 363: Inner hook 37: Magnetic induction group 371: Hall element 372: Magnetics 4: Steering unit 41: lever 410: Positioning bumps 411: Pivot 412: toggle end 413: Steering end 415: Top shaft segment 416: Bottom shaft segment 418: Push against the convex part 42: Steering shrapnel 43: Dust washer 44: Positioning shrapnel 441: Recess X: left and right direction Y: Front and rear direction Z: top and bottom direction

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: 1 is a perspective view of a conventional trigger switch; Fig. 2 is an incomplete perspective exploded view of the existing trigger switch; Figure 3 is a perspective view of an embodiment of the trigger switch of the present invention; Fig. 4 is an incomplete perspective exploded view of this embodiment; Fig. 5 is an incomplete sectional side view schematic diagram of this embodiment; 6 is a partially exploded perspective view illustrating a control unit and a steering unit of this embodiment mounted on a housing unit; Fig. 7 is a fragmentary perspective view from the bottom side toward the top side, illustrating a magnetic induction group of the control unit; FIG. 8 is a schematic top view illustrating the cooperation relationship between a lever of the steering unit and a positioning elastic piece; FIG. 9 is a view similar to FIG. 8 , illustrating that the lever is turned to the left and a push-abutting convex portion is snapped into a concave portion on the right side of the positioning elastic piece; FIG. 10 is a view similar to FIG. 9 , illustrating that the lever is turned to the right and the pushing protrusion is snapped into a recess on the left side of the positioning elastic piece; Fig. 11 is a schematic diagram of the upper surface of a circuit board of the control unit and a steering elastic piece of the steering unit; Fig. 12 is a schematic diagram of the lower surface of the circuit board and two conductive elastic sheets of a conductive slider group; FIG. 13 is a view similar to FIG. 12 , illustrating the movement of the conductive elastic pieces and the conduction of the switch signal of the circuit board; and Figure 14 is a view similar to Figure 11 illustrating the rotation of the diverter clip along the circuit board.

2: Shell base unit

20: Pivot slot

201: Sliding hole

203: Glue filling room

204: groove part

21: The first shell seat

211: Support table

212: Chute

213: Installation Department

214: Abutment Block

22: The second shell seat

221: Chute

3: Control unit

31: circuit board

32: Cable

33: Conductive sliding seat group

34: Trigger Group

341: Trigger

342: Push axis

343: Reset elastic

344: Dust ring

345: Groove

35: Sliding seat

350: Groove

351: Mounting slot

352: Slider

353: Axis channel

354: Fillet

356: upper opening

357: Front opening

36: Conductive shrapnel

37: Magnetic induction group

371: Hall element

372: Magnetics

4: Steering unit

41: lever

410: Positioning bumps

411: Pivot

412: toggle end

413: Steering end

415: Top shaft segment

416: Bottom shaft segment

42: Steering shrapnel

43: Dust washer

44: Positioning shrapnel

X: left and right direction

Y: Front and rear direction

Z: top and bottom direction

Claims (10)

A trigger switch suitable for mounting on a power tool, the trigger switch comprising: A shell base unit includes a first shell base and a second shell base which are opposite to each other, the first shell base and the second shell base cooperate to define an accommodating space, a accommodating space connected to the accommodating space and a sliding hole extending along a front-rear direction, and a pivot slot extending along a top-bottom direction, the housing unit has a mounting portion located in the accommodating space and opposite to the sliding hole; a control unit, operably disposed on the housing base unit, the control unit comprising: a circuit board, disposed in the accommodating space, the circuit board has several metal strips on the upper surface for controlling the rotation direction of the power tool, and several metal strips on the lower surface for controlling the operation of the power tool the conductive tape, A conductive sliding seat set is located in the accommodating space and can move relative to the circuit board along the front-rear direction, the conductive sliding seat set has a plurality of conductive elastic pieces for electrically connecting with the conductive strips, a trigger group, which can be pressed on the housing unit and used to drive the conductive sliding seat group to move, the trigger group has a push shaft that penetrates through the sliding hole and is connected to the conductive sliding seat group a reset elastic member compressed between the push shaft and the mounting portion, and a magnetic induction group, having a Hall element electrically connected to the circuit board, and a magnetic element disposed opposite to the Hall element and moving with the conductive slide group; and a steering unit, operably disposed on the housing base unit, the steering unit includes a lever pivotally disposed in the pivot slot, and a lever disposed on the lever and capable of being elastically contacted with the circuit board A steering elastic piece of a metal belt, the lever is integrally formed and has a pivot shaft pivoted in the pivot groove. The trigger switch according to claim 1, wherein the conductive sliding seat group further has a sliding seat connected to the push shaft, the conductive elastic pieces can be elastically arranged on the sliding seat, and the magnetic member is arranged on the sliding seat The Hall element is connected to the lower surface of the circuit board and faces the magnetic element. The trigger switch according to claim 1, wherein the lever further has a steering end for the steering elastic piece, and a positioning bump located between the steering end and the pivot, and the steering unit further includes a The positioning elastic sheet has a plurality of concave parts arranged at intervals, and the positioning convex block is selectively clamped into one of the concave parts. The trigger switch of claim 1, wherein the pivot groove has a dustproof section, and the steering unit further includes a set of dustproof washers disposed on the pivot shaft and accommodated in the dustproof section. The trigger switch according to claim 1, wherein the trigger group further has a dustproof ring embedded in the sliding hole and slidably contacting the push shaft. The trigger switch according to claim 1, wherein the housing unit further defines a glue filling chamber connected to the accommodating space, and the control unit further includes a glue filling chamber connected to the circuit board and passing through the glue filling chamber and passing through the glue filling chamber. The cable passing through the housing unit is used for filling the glue in the glue filling chamber so that the cable can be positioned. The trigger switch according to claim 1, wherein the conductive sliding seat group further has a sliding seat connected to the push shaft, the conductive elastic pieces can be elastically arranged on the sliding seat and move with the sliding seat, Each of the conductive elastic pieces has a conducting section for abutting against one of the conductive strips, two connecting sections respectively located on opposite sides of the conducting section, and two inner hook sections respectively connected to the connecting sections, The inner hook segments extend toward each other. The trigger switch as claimed in claim 7, wherein the sliding seat has a plurality of installation grooves located at the top and are respectively provided for the conductive elastic pieces, each of the installation grooves has a groove bottom, and the The inner hook segments are accommodated in the respective installation slots, and one of the inner hook segments of each of the conductive elastic sheets abuts against the bottom surface of the corresponding slot. The trigger switch according to claim 1, wherein the first housing seat and the second housing seat respectively have a sliding groove, and the sliding grooves are arranged opposite to each other in a left-right direction, and the conductive sliding seat group has a sliding groove connected to The sliding seat of the push shaft, the conductive elastic sheets can be elastically arranged on the sliding seat and move with the sliding seat, the sliding seat has two respectively formed on the left and right sides and slidably arranged on the sliding seat slotted slider. The trigger switch according to claim 1, wherein the trigger group further has a trigger for pressing, and the trigger is integrally formed with the push shaft, and an insert groove is formed at one end of the push shaft opposite to the trigger, The conductive sliding seat set has a sliding seat connected to the push shaft, and the sliding seat has a molding strip embedded in the embedding groove.

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