CN221135777U - Electric tool - Google Patents

Abstract

The present disclosure provides an electric tool including a housing; the motor is used for generating power; the working shaft is used for driving the working head; the torque output unit is used for transmitting power generated by the motor to the working shaft and enabling the working shaft to perform intermittent action; the torque output unit includes: the rotating piece is sleeved on the working shaft, and the inner wall of the rotating piece is enclosed to form an inner space for storing hydraulic fluid; the accommodating cavity is arranged between the inner wall of the rotating piece and the working shaft and is communicated with the inner space; the elastic piece is accommodated in the accommodating cavity, and when the hydraulic fluid flows into the accommodating cavity from the inner space, the elastic piece is used for bearing extrusion of the hydraulic fluid so as to compensate thermal expansion of the hydraulic fluid in the inner space; the elastic piece comprises a solid body, and the Shore hardness of the body is less than or equal to 80 degrees. The electric tool has stable performance and long service life.

Description

Electric tool

Technical Field

The present disclosure relates to the field of power tools, and more particularly, to an electric power tool.

Background

The electric tool is a tool for driving a working head to work through a transmission mechanism. Wherein the transmission comprises a chamber containing hydraulic fluid and an elastic member, typically a bladder, disposed within the chamber, the bladder being collapsible to compensate for thermal expansion of the hydraulic fluid within the chamber. However, the existing air bags are made of hollow structures and are mostly made of materials with larger Shore hardness such as fluorine silica gel, so that the air bags are easy to break in the using process, and the operation of the electric tool is affected.

Disclosure of Invention

In view of this, the present disclosure proposes a power tool that is stable in performance and long in lifetime.

In order to achieve one of the above-disclosed objects, an embodiment of the present disclosure provides a power tool including a housing; the motor is used for generating power; the working shaft is used for driving the working head; the torque output unit is used for transmitting the power generated by the motor to the working shaft and enabling the working shaft to perform intermittent action; the torque output unit includes: the rotating piece is sleeved on the working shaft, the power generated by the motor drives the rotating piece to rotate, the inner wall of the rotating piece encloses to form an inner space for storing hydraulic fluid, and at least one bulge is formed on the inner wall of the rotating piece; the blade is positioned in the inner space and protrudes out of the working shaft, the rotating piece drives the blade to rotate between a first position and a second position along the rotating direction, when the blade is positioned at the first position, the blade is in contact with the protrusion, and the rotating piece outputs torque to the working shaft; when the blade is positioned at the second position, the blade is separated from the bulge, and the rotating piece does not output torque to the working shaft; the accommodating cavity is arranged between the inner wall of the rotating piece and the working shaft and is communicated with the inner space; an elastic member accommodated in the accommodating chamber, wherein when the vane moves from the first position to the second position, hydraulic fluid flows into the accommodating chamber from the inner space, and the elastic member is used for bearing extrusion of the hydraulic fluid so as to compensate thermal expansion of the hydraulic fluid in the inner space; the elastic piece comprises a solid body, and the Shore hardness of the body is less than or equal to 80 degrees.

As a further improvement of an embodiment of the present disclosure, the material of the body includes a foaming material, and the foaming material forms a plurality of pores through a foaming process during the manufacturing process.

As a further improvement of an embodiment of the present disclosure, the foaming material includes polyurethane foaming material.

As a further improvement of an embodiment of the present disclosure, the material of the body comprises a thermoplastic elastomer material or a resin.

As a further improvement of an embodiment of the present disclosure, the shore hardness of the body is 50 degrees or less.

As a further improvement of an embodiment of the present disclosure, the elastic member further includes an outer layer, the outer layer is sleeved outside the body, and an air layer is disposed between the outer layer and the body.

As a further improvement of an embodiment of the present disclosure, the shore hardness of the outer layer is greater than or equal to the shore hardness of the body.

As a further improvement of an embodiment of the present disclosure, the outer layer has a shore hardness of greater than or equal to 50 degrees.

As a further improvement of an embodiment of the present disclosure, the material of the body is different from the material of the outer layer.

As a further improvement of an embodiment of the present disclosure, the material of the outer layer includes fluorosilicone rubber or resin.

According to the electric tool, the body of the elastic piece is solid, the solid body is subjected to high-frequency impact in a high-temperature environment, and is not easy to break, so that the electric tool has a long service life; meanwhile, the Shore hardness of the body is set to be less than or equal to 80 degrees, so that the body can generate larger deformation when being extruded, and the thermal expansion of hydraulic fluid in the inner space can be compensated better.

Drawings

Fig. 1 is a schematic structural diagram of an electric tool according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram illustrating assembly of each unit and a mounting portion of a housing in an electric tool according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a torque output unit in an electric tool according to an embodiment of the present disclosure;

FIG. 4 is a schematic cross-sectional view of the structure at A-A in FIG. 3;

FIG. 5 is a schematic diagram of a transmission process of a torque output unit in the power tool according to the embodiment of the disclosure;

Fig. 6 is a schematic structural diagram of an elastic member in an electric tool according to an embodiment of the disclosure.

Reference numerals: 100. an electric tool; 1. a housing; 11. a mounting part; 12. a grip portion; 13. a control unit; 2. a motor; 3. a working shaft; 31. a locking cavity; 311. a slip groove; 312. an axial bore; 313. a transition chamber; 314. a ball; 32. a front housing; 321. a bolt; 322. a seal ring; 33. a pipe plug; 331. a screw; 4. a working head; 5. a torque output unit; 51. a rotating member; 511. an inner space; 512. a protrusion; 5121. an abutting edge; 513. a pressing plate; 5131. a through hole; 514. a cam shaft; 52. a blade; 53. a receiving chamber; 54. an elastic member; 541. a body; 542. an outer layer; 55. a pin shaft; 6. a control unit; 7. a transmission unit; 8. and a clamping unit.

Detailed Description

The present disclosure will be described in detail below with reference to the detailed description of the embodiments shown in the drawings. These embodiments are not intended to limit the disclosure, but structural, methodological, or functional transformations of one of ordinary skill in the art based on these embodiments are included within the scope of the present disclosure.

It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present disclosure should be taken in a general sense as understood by those having ordinary skill in the art to which the present disclosure pertains. The terms "first," "second," and the like, as used in embodiments of the present disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

The torque transfer unit operates at high frequency during transmission, and not only heats the hydraulic fluid to place the elastic member disposed in the chamber in a high temperature environment, but also generates high frequency impact on the elastic member. The existing elastic piece adopts a hollow structure, and is mostly made of materials with larger Shore hardness such as fluorine silica gel, so that the elastic piece is easy to break in the use process and has shorter service life.

Referring to fig. 1 to 6, an electric power tool 100 provided in an embodiment of the present disclosure includes a housing 1; a motor 2 for generating power; a working shaft 3 for driving the working head 4; a torque output unit 5 for transmitting power generated by the motor 2 to the working shaft 3 and causing the working shaft 3 to perform an intermittent operation; the torque output unit 5 includes: the rotating member 51 is sleeved on the working shaft 3, the power generated by the motor 2 drives the rotating member 51 to rotate, an inner wall of the rotating member 51 encloses an inner space 511 for storing hydraulic fluid, and at least one protrusion 512 is formed on the inner wall of the rotating member 51; a vane 52 disposed in the inner space 511 and protruding from the working shaft 3, the rotary member 51 driving the vane 52 to rotate in a rotation direction between a first position and a second position, wherein the vane 52 contacts the protrusion 512 when the vane 52 is in the first position, the rotary member 51 outputting torque to the working shaft 3; when the vane 52 is located at the second position, the vane 52 is disengaged from the projection 512, and the rotary member 51 does not output torque to the working shaft 3; a housing chamber 53, the housing chamber 53 being provided between the inner wall of the rotary member 51 and the working shaft 3, the housing chamber 53 communicating with the inner space 511; an elastic member 54 accommodated in the accommodating chamber 53, the hydraulic fluid flowing into the accommodating chamber 53 from the inner space 511 when the vane 52 moves from the first position to the second position, the elastic member 54 being adapted to receive the compression of the hydraulic fluid to compensate for the thermal expansion of the hydraulic fluid in the inner space 511; the elastic member 54 includes a solid body 541, where the shore hardness of the body 541 is less than or equal to 80 degrees.

In the electric tool 100 of the present disclosure, the elastic member 54 includes a solid body 541, and the solid body 541 is subjected to high-frequency impact in a high-temperature environment, is not easy to break, and has a long service life; meanwhile, the shore hardness of the body 541 is 80 degrees or less, so that the body 541 can be greatly deformed when being compressed, so as to better compensate for the thermal expansion of the hydraulic fluid in the internal space 511.

When the electric tool 100 is operated, the motor shaft of the motor 2 rotates and transmits torque to the torque output unit 5; the torque output unit 5 receives the torque transmitted from the motor shaft and intermittently transmits the torque to the working shaft 3; the working shaft 3 receives the torque transmitted by the torque output unit 5 and rotates under the drive of the torque, so that the working head 4 is driven to act.

Referring to fig. 1, in one embodiment, the power tool 100 is a hand-held power impact tool. The electric tool 100 further comprises a control unit 6, a transmission unit 7 and a clamping unit 8, wherein the control unit 6 is connected with other units and used for controlling the electric tool 100 to work; the transmission unit 7 is arranged between the motor 2 and the torque output unit 5 and is used for adjusting the torque of the motor 2; the clamping unit 8 is used to connect the working shaft 3 and the working head 4. Preferably, the transmission unit 7 may be a primary gear reduction system. When the electric tool 100 works, the transmission unit 7 can reduce the rotation speed of the motor 2 and improve the torque of the motor 2, so that the working efficiency of the electric tool 100 is improved, and the electric tool 100 can be operated more stably and reliably.

Further, the housing 1 is used for accommodating and positioning other components of the electric tool 100, and is a supporting frame of the electric tool 100; the housing 1 includes a mounting portion 11, a grip portion 12, and a control portion 13, the mounting portion 11 being for mounting the motor 2, the transmission unit 7, the torque output unit 5, the working shaft 3, and the grip unit 8; the control part 13 is used for installing the control unit 6 and adapting the battery pack; the grip 12 is provided between the mounting portion 11 and the grip 12, is convenient for a user to grip, and accommodates connection lines between the battery pack, the control unit 6, and other units. The mounting portion 11, the grip portion 12 and the control portion 13 are disposed in an up-down manner, and the size in the lateral direction can be reduced while conforming to the operation habit of the human body.

Referring to fig. 2 and 3, in one embodiment, the torque output unit 5 is a piston type oil pressure impact unit, and the motor 2 drives the rotation member 51 of the torque output unit 5 to rotate through the transmission unit 7. The rotary member 51 is sleeved on the outer side of the working shaft 3 and forms rotatable sealing connection with the working shaft 3. The rotating member 51 includes opposite first and second ends, the first end being adjacent to the transmission unit 7 and being fixedly connected to the transmission unit 7 by a pin 55; the second end is close to the working head 4. In one embodiment, a front housing 32 is sleeved outside the working shaft 3, and the front housing 32 is fixed on the second end of the rotating member 51. A pressing plate 513 is disposed in the rotary member 51, the pressing plate 513 being for spacing the inner space 511 and the accommodating chamber 53. The accommodating chamber 53 is defined by the front case 32 and the pressing plate 513.

Further, the pressing plate 513 is annular and is sleeved on the circumferential outer side of the working shaft 3; a plurality of through holes 5131 are uniformly and spaced apart from the edge of the pressing plate 513 away from the working shaft 3, and the inner space 511 and the accommodating chamber 53 communicate through the through holes 5131. The provision of the pressing plate 513 and the through holes 5131 facilitates the flow of the hydraulic fluid in the inner space 511 into the accommodating chamber 53 so that the elastic member 54 compensates for the thermal expansion of the hydraulic fluid, and also can retract the elastic member 54 within the accommodating chamber 53 to prevent the elastic member 54 from moving.

Referring to fig. 3, 4 and 5, in one embodiment, the protrusions 512 and the vanes 52 cooperate to define whether the rotary member 51 outputs torque to the working shaft 3. Wherein the protrusion 512 has an abutment edge 5121, and the protrusion 512 and the vane 52 cooperate to define whether the rotary member 51 outputs torque to the working shaft 3 means that: when the abutment edge 5121 of the projection 512 contacts the vane 52 and pushes the vane 52 to move toward the working shaft 3, the rotary member 51 outputs torque to the working shaft 3; when the abutment edge 5121 is disengaged from the vane 52, the rotary member 51 does not output torque to the working shaft 3.

Further, the rotary member 51 includes a cam shaft 514, and the cam shaft 514 rotates in synchronization with the rotary member 51. The working shaft 3 is provided with a locking cavity 31 and a connecting channel, and the connecting channel is communicated with the locking cavity 31 and the inner space 511; the locking cavity 31 comprises a sliding slot 311, an axial bore 312 and a transition cavity 313; the sliding groove 311 is matched with the blade 52 and can be used for sliding the blade 52; the axial hole 312 is formed along the axial direction of the working shaft 3 and is used for accommodating the cam shaft 514; the transition cavity 313 is used for communicating the sliding groove 311 and the axial hole 312, and a ball 314 is arranged in the transition cavity, and the ball 314 is used for blocking the axial hole 312.

Referring to fig. 5, the cam shaft 514 and the rotary member 51 are rotated in the direction indicated by arrow F in the drawing, wherein in fig. 5a, the inner space 511 and the lock chamber 31 communicate, the vane 52 is not in contact with the abutment edge 5121 of the boss 512, and the rotary member 51 does not output torque to the working shaft 3;

In fig. 5b, the inner space 511 is in communication with the locking chamber 31, the protrusion 512 rotates to be in contact with the abutment edge 5121 of the vane 52, but does not push the vane 52 to move toward the working shaft 3, and at this time, the rotating member 51 does not output torque to the working shaft 3;

In fig. 5c, the inner space 511 and the locking cavity 31 are not communicated, the locking cavity 31 is a closed cavity, the abutting edge 5121 of the protrusion 512 rotates to abut against the vane 52, and the vane 52 moves into the working shaft 3 under the extrusion of the abutting edge 5121, so that the locking cavity 31 is in a high-pressure state, and the rotating member 51 outputs torque to the working shaft 3;

In fig. 5d, the inner space 511 and the lock chamber 31 communicate, the vane 52 passes over the abutting edge 5121 of the boss 512, the vane 52 does not contact with the abutting edge 5121 of the boss 512, and the rotary member 51 does not output torque to the working shaft 3.

When the vane 52 is in the first position (i.e., the position shown as 5c in fig. 5), the cam shaft 514 blocks the connecting passage so that the locking cavity 31 forms a closed cavity; the vane 52 contacts the boss 512 and moves inward of the working shaft 3 to compress the volume of the locking chamber 31, resulting in a pressure in the locking chamber 31 greater than that in the inner space 511, the working shaft 3 and the cam shaft 514 form a fixed connection under the pressure in the locking chamber 31, the working shaft 3 rotates with the cam shaft 514, and the rotating member 51 outputs torque to the working shaft 3.

When the vane 52 is in the second position (i.e., the position shown as 5a and 5d in fig. 5), the connecting passage communicates the inner space 511 and the lock chamber 31 so that the pressure in the lock chamber 31 is the same or nearly the same as the pressure in the inner space 511, and at this time, the working shaft 3 and the cam shaft 514 are relatively movable, and the rotary member 51 does not output torque to the working shaft 3.

Further, referring to fig. 3 and 4, based on the orientation shown in fig. 3, the left and right ends of the vane 52 are respectively in rotatable sealing connection with the rotating member 51 and the pressing plate 513, and the vane 52 is in slidable sealing connection with the working shaft 3 in the sliding groove 311, so as to ensure the tightness of the locking cavity 31, and prevent the locking cavity 31 from being not tightly sealed and being unable to lock the rotating member 51 and the working shaft 3. The sealing mode can be proper sealing modes such as oil seal sealing, mechanical sealing and the like. Preferably, the camshaft 514 is also in a rotatable sealing connection with the working shaft 3, further ensuring the tightness of the locking chamber 31.

With continued reference to fig. 3 and 4, in one embodiment, a bolt hole is formed in a side of the front housing 32 away from the pressure plate 513, a bolt 321 for blocking the bolt hole is disposed in the bolt hole, and a seal 322 is disposed between a nut of the bolt 321 and the front housing 32 to prevent hydraulic fluid in the receiving chamber 53 from overflowing. Further, a seal ring 322 is disposed between the front housing 32 and the second end of the rotating member 51 and between the front housing 32 and the working shaft 3, so as to maintain the sealing between the front housing 32 and the rotating member 51 and between the front housing 32 and the working shaft 3, thereby ensuring the sealing of the inner space 511 and preventing the hydraulic fluid from overflowing.

With continued reference to fig. 3 and 4, in one embodiment, the end of the working shaft 3 adjacent the working head 4 is provided with a mounting hole for receiving the working head 4 and communicating with the axial bore 312. A pipe plug 33 is arranged in the mounting hole, the pipe plug 33 is fixed in the mounting hole through a screw 331, and sealing rings 322 are arranged between the pipe plug 33 and the working shaft 3 and between the screw 331 and the working shaft 3 and are used for sealing the mounting hole, so that hydraulic fluid in the axial hole 312 is prevented from overflowing through the mounting hole.

Referring to fig. 3, in an embodiment of the present disclosure, the material of the body 541 includes a foaming material, and the foaming material forms a plurality of pores through a foaming process during the manufacturing process. The formation of the air holes can reduce the hardness of the body 541 so that the body 541 can be greatly deformed when being pressed to better compensate for the thermal expansion of the hydraulic fluid in the internal space 511.

Further, referring to fig. 3, the foaming material includes polyurethane foaming material. The polyurethane foam material has oil resistance and high elasticity, can keep elasticity in high-temperature hydraulic fluid, is suitable for the internal environment of the electric tool 100, and has long service life. Alternatively, the foaming material may also include polyethylene foaming material, polypropylene foaming material, and the like.

Table 1: service life comparison test table for hollow air bag and solid body

As shown in table 1 above, the solid polyurethane body 541 has a longer service life than a hollow fluorosilicone bladder.

In one embodiment of the present disclosure, the material of the body 541 includes a thermoplastic elastomer material or a resin, and both materials have a certain elasticity and good workability, so that the need of the body 541 for compensating the thermal expansion of the hydraulic fluid is satisfied, and the production and the manufacturing are facilitated.

In an embodiment of the present disclosure, the shore hardness of the body 541 is 50 degrees or less, so that the body 541 is easy to deform when being extruded. Preferably, the shore hardness of the body 541 may be 35 degrees, 40 degrees, 45 degrees, etc.

Referring to fig. 6, wherein an embodiment of the resilient member 54 of the present disclosure including a body 541 is illustrated in fig. 6 a; in another embodiment of the present disclosure, illustrated in fig. 6b, the elastic member 54 further includes an outer layer 542, the outer layer 542 is sleeved outside the body 541, and an air layer is provided between the outer layer 542 and the body 541. The body 541 can provide support when the outer layer 542 is deformed by extrusion, so as to prevent the outer layer 542 from being damaged, and prolong the service life of the elastic member 54, and further prolong the service life of the electric tool 100. It is understood that the body 541 can be used as the elastic member 54 alone, or can be mated with the outer layer 542 to form the sandwich-like elastic member 54.

Further, the shore hardness of the outer layer 542 is greater than or equal to the shore hardness of the body 541, so that the deformation resistance of the outer layer 542 can be enhanced, fatigue damage caused by frequent deformation of the outer layer 542 is avoided, and the service life of the outer layer 542 is prolonged. Specifically, the shore hardness of the body 541 is 50 degrees or less, and the shore hardness of the outer layer 542 is 50 degrees or more. Preferably, outer layer 542 has a shore hardness of between 50 degrees and 80 degrees, such as 55 degrees, 60 degrees, 70 degrees, etc.

In one embodiment of the present disclosure, the material of the body 541 is different from the material of the outer layer 542. Specifically, the material of the body 541 includes one of a polyurethane foam material, a thermoplastic elastomer material, or a resin; the material of the outer layer 542 includes fluorosilicone rubber. The polyurethane foam material may have a plurality of pores therein during the foaming process, and if the outer layer 542 is made of the polyurethane foam material, there is a risk of air leakage, which affects the impact resistance of the elastic member 54, so the polyurethane foam material is not suitable for making the outer layer 542. The material of the outer layer 542 is fluorosilicone rubber, so that gas or hydraulic fluid can be prevented from penetrating into the elastic member 54, and the service life of the elastic member 54 is ensured. Alternatively, the material of the body 541 and the material of the outer layer 542 may be the same, and for example, the outer layer 542 may be a resin material.

The "body" and "certain portion" may be a part of the corresponding "member", that is, the "body" and "certain portion" are integrally formed with the other portion of the "member"; or a separate component which is separable from the other part of the component, namely, a certain body and a certain part can be independently manufactured and then combined with the other part of the component into a whole. The expressions of "a body" and "a portion" are merely one of the embodiments, and for convenience of reading, not limitation of the scope of protection of the disclosure, as long as the features described above are included and the actions are the same, it should be understood that the invention is equivalent.

It should be noted that the foregoing describes some embodiments of the present disclosure. Other embodiments are within the scope of the following claims.

Those of ordinary skill in the art will appreciate that: the discussion of any of the above embodiments is merely exemplary and is not intended to suggest that the scope of the disclosure, including the claims, is limited to these examples; this manner of description of the invention is for the sake of clarity only, and it should be apparent to those skilled in the art that the description as a whole, under the teachings of the present disclosure, may suitably be combined between the features of the above embodiments or of the various embodiments, and that there are many other variations of the various aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of brevity.

The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalents, improvements, and the like, which do not depart from the spirit and principles of the embodiments of the disclosure, are intended to be included within the scope of the disclosure.

Claims (10)

1. A power tool, comprising:

A housing;

The motor is used for generating power;

the working shaft is used for driving the working head;

The torque output unit is used for transmitting the power generated by the motor to the working shaft and enabling the working shaft to perform intermittent action; the torque output unit includes:

the rotating piece is sleeved on the working shaft, the power generated by the motor drives the rotating piece to rotate, the inner wall of the rotating piece encloses to form an inner space for storing hydraulic fluid, and at least one bulge is formed on the inner wall of the rotating piece;

the blade is positioned in the inner space and protrudes out of the working shaft, the rotating piece drives the blade to rotate between a first position and a second position along the rotating direction, when the blade is positioned at the first position, the blade is in contact with the protrusion, and the rotating piece outputs torque to the working shaft; when the blade is positioned at the second position, the blade is separated from the bulge, and the rotating piece does not output torque to the working shaft;

The accommodating cavity is arranged between the inner wall of the rotating piece and the working shaft and is communicated with the inner space;

An elastic member accommodated in the accommodating chamber, wherein when the vane moves from the first position to the second position, hydraulic fluid flows into the accommodating chamber from the inner space, and the elastic member is used for bearing extrusion of the hydraulic fluid so as to compensate thermal expansion of the hydraulic fluid in the inner space;

The elastic piece comprises a solid body, and the Shore hardness of the body is less than or equal to 80 degrees.

2. The power tool of claim 1, wherein the material of the body comprises a foamed material that forms a plurality of air holes during the manufacturing process by a foaming process.

3. The power tool of claim 2, wherein the foam material comprises a polyurethane foam material.

4. The power tool of claim 1, wherein the material of the body comprises a thermoplastic elastomer material or a resin.

5. The power tool of claim 1, wherein the body has a shore hardness of 50 degrees or less.

6. The power tool according to claim 1, wherein the elastic member further comprises an outer layer, the outer layer is sleeved outside the body, and an air layer is provided between the outer layer and the body.

7. The power tool of claim 6, wherein the outer layer has a shore hardness greater than or equal to a shore hardness of the body.

8. The power tool of claim 7, wherein the outer layer has a shore hardness greater than or equal to 50 degrees.

9. The power tool of claim 6, wherein the body is of a material different from the material of the outer layer.

10. The power tool of claim 9, wherein the material of the outer layer comprises a fluorosilicone rubber or resin.