JP3053999U - Electric tool - Google Patents

Abstract

(57) [Summary] [PROBLEMS] The angle of a grip and a main body can be changed, the main body and a power tool head can be joined and removed, and it is applied to various types of removable power tools and power tool structures for different applications, and attached. Power tool that can SOLUTION: A grip 1, a main body 2, and a power tool head 3 are provided.
including. The grip 1 is movably joined to the main body 2 on a slope, and an introduction tenon 15 is protruded from the grip 1 on a slope 14 so that
It fits into the arc-shaped introduction tank 24 on the slope 23. Grip 1
Is rolled by the arc-shaped introduction tank 24, and can change the coupling angle between the grip 1 and the main body 2. The main body 2 and the power tool head 3 have an engagement unit at one end, and are connected to the engagement unit of the main body 2.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a power tool. In particular, the angle between the grip and the main body can be changed, and the main body and the power tool head can be quickly joined and removed by the engagement device, and can be used in different applications such as polishers, cutting machines, polishing machines, vacuum cleaners, The present invention relates to various removable power tools such as jacks, socket spanners, screwdrivers, drills, etc., and to a multi-purpose power tool which can be applied to and attached to a power tool structure.

[0002]

[Prior art]

 At present, power tools or power tools (hereinafter abbreviated as power tools) are used at sites in various industries to supplement the need for various tasks. It is possible to achieve the effects of saving labor, improving operation convenience, and so on, for example, by attaching tire nuts and using an electric jack to lift and maintain the vehicle. However, most of the power tools currently on the market have the body structure and the transmission structure, which are the power supply parts, integrated, so that the tool body and the tool head cannot be disassembled and replaced. However, a kind of electric tool can perform only one kind of work. In addition, since there are so many types of power tools used in each industry, consumers are obliged to purchase various types of power tools, despite the fact that the price of power tools is not low as is well known. Must. It's uneconomical and inconvenient. This is a kind of heavy burden for ordinary households. In addition, conventional power tools have many grips, which are gripping parts, of fixed type and cannot adjust the gripping angle, so that in various cases it is convenient to apply force during operation. Can't provide good grip.

[0003]

[Problems to be solved by the invention]

 In order to solve the above-mentioned drawbacks of the conventional product, the present invention has an object to provide a versatile power tool capable of removing and replacing a tool head and changing a grip angle. With this structure, the user only needs to own one main body of the present invention, and selects and sets the power tool head such as a power drill, a power screwdriver, a power grinder, etc., whose use is different according to the work needs. Can be. In addition, power tools such as polishers, vacuum cleaners, tire nut socket spanners, and electric jacks, which often need to be used on automobiles, are provided to consumers by installing different tool heads on the same body. can do.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, a multi-purpose power tool is provided. It mainly comprises a body and a number of tool heads, which can be quickly assembled and disassembled. Thus, the body can be adapted to the installation of a variety of different tool heads, and can be efficiently saved and purchased. In addition, the grip of the present invention allows the angle to be selected and adjusted with respect to the body and can be used in many cases. The present invention divides the power tool into three main parts. It is the grip, body and power tool head. The end of the grip and the upper end of the main body form an inclined surface having the same angle, and the lower part of the grip and the main body have a substantially columnar shape. The end of the grip and the upper end of the body are movably joined at the center, and the grip rolls with respect to the body, forming an angle change, for example, forming a connection in the shape of a pen or a pistol. it can. A motor is installed in the main body, and the driving shaft of the motor is exposed to the outside of the main body. At the end of the power tool head, different power tools are installed based on the application, a dynamic transmission unit or a reduction unit is installed inside, an engagement unit is installed at the upper end, and an engagement unit at the end of the main body And decoupling. The power of the drive shaft of the main body is transmitted to the end of the power tool head via the power transmission or reduction gear unit. The power tool head is removed from the end of the main body, and replaced with a different power tool head. Regarding the engagement unit of the main body and the power tool head, the following several embodiments are provided as examples. First, there is a structure in which a lock ring is used to fit, screw, or engage, or a concave tank and an engagement fixing block are installed on the joint surface of the two, and the two are directly rolled and fitted.

[0005]

[Embodiment of the invention]

 As shown in FIG. 1, the present invention includes a grip 1, a main body 2, a tool head 3, and a lock ring 4. The grip 1 and the main body 2 have a somewhat polygonal pillar shape, and an insertion hole is provided on the grip 1 so as to be used for insertion of an outlet 11 for home (AC) and automobile (DC) power supplies. Alternatively, it can be connected to a power source such as a general battery. A localization key 12 is provided at an appropriate position of the grip 1. When the grip 1 is used, the localization key 12 is moved to release the localization state of the grip 1 and the main body 2. As a result, the grip 1 can rotate with respect to the main body 2 to form a change in the angle, so that the user can easily grip and apply the force. Further, on the grip 1, a three-stage power switch 11a for controlling on / off, forward rotation and reverse rotation is installed. The power tool head 3 (in this embodiment, an electric screwdriver is used as an example) can be fitted to the end of the main body 2 by a fitting claw 31 installed at the upper end thereof. Furthermore, the locking effect is achieved by the annular lock ring 4 installed on the outer periphery. Next, as shown in FIGS. 2 to 4, the inside of the main body 2 of the present invention is mainly used for installing a power motor. The driving shaft 21 bears a small gear 211 as a gear transmission part and is exposed outside the main body 2. Since the main body 2 and the shell body outside the grip 1 are formed by the same type of upper and lower halves, the T-shaped insertion post 22 extending at the center of the upper end face of the main body 2 is located at the center of the end face of the grip 1. It extends and fits into the insertion hole 13 formed in the portion. Thereby, the grip 1 can be rotated with respect to the main body 2 to perform coaxial rolling, and there is no fear of falling off. A tangential hole 221 is formed at the center of the T-shaped insertion post 22. The power cord extending from the insertion hole 13 enters the main body 2 from here, and supplies power to the motor. The joint portions of the grip 1 and the main body 2 form slopes 14 and 23 at an appropriate angle, respectively, and come into contact with each other. Further, an arc-shaped introduction tank 24 is installed on the slope 23, and the introduction tenon 15 projecting and installed on the slope 14 is made to enter. The localization key 12 installed in the grip 1 is controlled by an elastic part 121 installed in the interior of the grip 1, and in this system, the projection end 122 of the front end of the localization key 12 is inclined by the elastic extension action of the elastic part 121. In the localization hole 241 of FIG. As a result, the fixing effect is achieved, and the grip 1 cannot roll. When the angle of the grip 1 is to be changed, the localization key 12 is first moved, and the protruding end 122 is withdrawn from the localization hole 241. At this time, the grip 1 can be rolled, and the introduction tenon 15 can be slid in the arc-shaped introduction tank 24. When the grip 1 slides and reaches the closed portion of the arc-shaped introduction tank 24, the grip 1 cannot roll any further. In the first embodiment of the present invention, since the arc-shaped introduction tank 24 is designed at 180 °, when the grip 1 is rolled up to 180 °, the originally linear body 2 is converted into a pistol grip shape. I do. Moreover, after rolling, the protruding end 122 of the localization key 12 enters into and engages with the other fixing hole 25 of the slope 23 to achieve the fixing effect. Thereby, the grip 1 forms an angle with the main body 2, and the user can select an operation as desired. On the other hand, in order to prevent slippage at the time of rolling of the end face of the joint portion between the grip 1 and the main body 2, projections 141, 231 are provided on the slopes 14, 23 to form an appropriate friction.

Subsequently, as shown in FIG. 4, a speed reduction transmission unit is mainly installed inside the power tool head 3 according to the first embodiment of the present invention. Most of the structure is publicly known, and therefore will be briefly described. At the inner bottom of the power tool head 3, a torque safety device composed of an annular cap 52, bearings 53, packings 54, 55, elastic parts 56, and a bearing stand 57 is fixed by screws 51. Further, the gear installation cylinder 6 is disposed, and the bottom of the gear installation cylinder 6 is fitted into an annular tank 631 installed on the shaft 63 mainly by a C-shaped shaft cover 61 and an iron ring packing 62. The shaft 63 can be fixed and rolled. The open end in front of the tool head 3 is fitted into the front cap 64 and the inner cap 65 to form a closed state. Moreover, the shaft 63 is exposed to the outside of the front cap 64 and is used for installing a screwdriver. First, a gear cap 71 provided with an annular internal gear 711 is installed in the gear installation cylinder 6, three pins 71 are inserted, and the gear cap 71 is fixed on the shaft rod plate 632. Further, the three planetary gears 72 are movably installed on the shaft rod plate 632 on the shaft rod 63, and the respective gear portions mesh with the annular internal gear 711 of the gear cap 71 to form a planetary gear unit. After the packings 73, 73 are laid on the gear cap 71, a gear cap 75 is further installed. The gear cap 75 is engaged in an engagement groove 66 formed in the inner wall of the gear installation cylinder 6 by a parallel bar-shaped tenon 715 installed on the side surface thereof, and does not roll. Thus, two sets of planetary gears 76 and 77 and two partition plates 78 and 79 are installed in the gear cap 75. Thus, when the electric tool head 3 and the main body 2 are combined, the driving shaft 21 of the main body 2 extends into the tool head 3 because the perforation 32 is formed at the joint end portion at the upper end of the tool head 3, and the small gear 211 meshes with three planetary gears 76. By the transmission of each planetary gear unit, the shaft 63 achieves the purpose of reducing the speed and increasing the torque.

Further, as shown in FIGS. 5 to 7, the main body 2 and the power tool head 3 of the first embodiment of the present invention have an engagement structure that allows quick combination and removal. It mainly has several fixed blocks 26 installed on the front end plane of the main body 2, and several fitting claws 31 arranged in an annular shape extending upward at the upper end of the tool head 3. Because the mating pawl 31 is somewhat resilient, it can be directly pressed to reduce its outer diameter slightly and engage the lock ring 4 thereon. Since the end of the fitting claw 31 has a triangular key shape, the lock ring 4 can be prevented from falling off, and its transmission can be performed smoothly. On the inner wall of the lock ring 4, several fixed oblique pieces 41 are installed. When the main body 2 and the tool head 3 are combined, the lock ring 4 is rolled, and the fixed oblique piece 41 is moved outside the fitting claw 31. (See FIG. 6). Further, at least some of the fitting claws 31 are provided with bar-shaped guard blocks 311 on their side edges to prevent the fixed oblique piece 41 from rolling, thereby forming a rolling locked state. At this time, the fitting claw 31 can be engaged only in the gap formed by each fixed block 26. Due to the inhibition of the fixed block 26, the tool head 3 and the fitting claw 31 cannot continue rolling in the radial direction. When the lock ring 4 rolls in the opposite direction (see FIG. 7), the fixed oblique piece 41 on the inner wall is rolled and reaches the outside of the gap between the fitting claws 31. Since the fixed oblique piece 41 during rolling is not of the full-piece type, the inclined face 411 installed below the fixed oblique piece 41 slowly contacts the guard surface 261 on the upper side of the fixed block 26. At this time, since the tool head 3 and the lock ring 4 cannot be separated from the main body 2 in the axial direction, an effect of fixedly connecting the main body 2 and the electric tool head 3 is achieved. Moreover, in the locking process of the lock ring 4, the fixed oblique piece 41 stops rolling by timely stopping the guard block 311, so that excessive rolling is prevented. For the same reason, when trying to disassemble the tool head 3 and the main body 2, if the lock ring 4 is rolled in the opposite direction and returned to the original state, the tool head 3 and the main body 2 can be separated, so that different applications are possible. Can be replaced with a new power tool head.

Next, as shown in FIGS. 8 to 13, a second embodiment of the present invention is composed of a grip 10, a body 20, a lock ring 30, and a power tool head 40. The grip 10 and the main body 20 have a somewhat cylindrical shape, and several engagement annular grooves 27 are provided in the engagement unit at the end of the main body 20. The lock ring 30 is also a similar annular body, and on the inner wall 33 is provided an annular tenon 34 which can be screwed or connected with several engaging annular grooves 27, respectively. At an appropriate position, an engagement tank 35 having many arc-shaped tank paths 351 is installed. The power tool head 40 is provided with a perforation 402 in the center, and is used to insert a small gear 211 as a gear transmission component of the driving shaft 21 of the main body 20 to transmit power and reduce the speed of the gear unit 44. A large number of fitting claws 42 extend upward from the peripheral edge of the upper end, and the front end of each of the claws 42 forms an oblique cone engaging portion 43. When assembled, the lock ring 30 is joined by an annular tenon 34 in the engagement annular groove 27 of the main body 20. When trying to quickly assemble the power tool head 40, it can be easily performed as follows. First, the fitting claws 42 are fitted into the inner holes of the lock ring 30, and the oblique cone engaging portions 43 at the front ends of the fitting claws 42 are brought into contact with the inner wall 33 of the lock ring 30, and the electric tool head 40 is rolled. Move. As a result, the fitting claw 42 can be slid into the engagement tub 35 and engaged therewith, thereby achieving a tight engagement and combination effect (see FIGS. 11 and 12). When the power tool head 40 is to be removed, the lock ring 30 is first rolled in one direction. As a result, the resilient fitting claw 42 of the oblique cone engaging portion 43 receives all the resistance of the bottom surface of the arc-shaped tank passage 351 and is internally contracted, as shown in FIG. Engages and disengages the locking ring engagement tank 35. As a result, each fitting claw 42 pivots and slides on the lock ring 30 to completely disengage the inner wall 33, and the power tool head 40 disengages the lock ring 30 for disassembly.

Next, as shown in FIGS. 14 to 20, the engaging unit of the main body 8 according to the third embodiment of the present invention is provided with several engaging and fixing blocks 826 below the distal end. Each engagement fixing block 826 extends and protrudes in the diameter direction, and the outer surface of the engagement fixing block 826 gradually becomes higher and wider toward the outside, and the height (thickness) of the plate portion on the a side is A protruding pattern 827 having a height lower than the height (thickness) of the plate portion on the side b and having projections is provided on the outer peripheral surface thereof. The engaging unit of the power tool head 9 is provided with a fitting portion 931 having an annular opening at the upper end, and an upper edge 932 of the fitting portion 931 has a concave shape corresponding to the shape of the cross section of the engagement fixing block 826. The tank 933 is opened. The inner wall 934 of the fitting portion 931 is provided with a radially contracted contact surface 935, and a projection 936 is disposed on the contracted contact surface 935. At the time of assembling, the engaging and fixing block 826 of the main body 8 is fitted into the concave tank 933 of the electric tool head 9 and fitted, and the engaging and fixing block 826 is further slid into the tool head fitting portion 931 to roll the two together. Then, the engagement fixing block 826 is tightly engaged by the friction of the contraction contact surface 935. The greater the rolling power, the greater the degree of engagement and fixation between the engagement and fixation block 826 and the internal contraction contact surface 935, and the action of tight fixation can be achieved quickly. When the main body 8 and the power tool head 9 are to be removed, the main body 8 is rolled in the opposite direction, and each engagement fixing block 826 is withdrawn from the lock position, and is withdrawn from the concave tank 933 position. be able to.

The drawings and the description of the embodiments illustrate the spirit of the present invention using examples, but do not limit the embodiments of the present invention. For example, the shapes of the grip and the main body of the present invention are polygonal pillars in the first embodiment, and circular pillars in the second and third embodiments. Does not indicate that other possible shapes cannot be used. Further, for example, FIGS. 21 to 24 of the present invention respectively show that the present invention can be applied to an electric screwdriver, a grinder, and a polisher. In fact, they are all applicable to other vehicles, such as drills, socket spanners, cutting machines, vacuum cleaners, or household goods. In addition, as shown in FIGS. 5 and 10 of the present invention, a specific reduction unit inside the electric tool head is actually provided with another possible transmission or reduction unit depending on the use of the tool head. can do.

[0011]

[Effect of the invention]

 As described above, the power tool that can change the coupling angle between the grip and the main body proposed by the present invention can be applied to various different use situations. As is clear from the description of the engagement unit between the main body end and the power tool head using the three embodiments, the present invention can surely achieve the above-mentioned main object. In other words, the present invention has a very practical value by providing consumers with a choice of use by combining different tool heads with the main body.

[Brief description of the drawings]

FIG. 1 is a three-dimensional external view of a first embodiment of the present invention.

FIG. 2 is an external view illustrating a state in which the grip and the main body are joined by a slope.

FIG. 3 is a partially broken vertical sectional view showing a state where the grip and the main body are joined in a pen shape.

FIG. 4 is a partially broken vertical sectional view showing a state in which the grip and the main body are formed at an angle and joined together.

FIG. 5 is an exploded perspective view of the same.

FIG. 6 is an enlarged plan sectional view for explaining a correlation position state of the main body, the lock ring, and the power tool head.

FIG. 7 is an enlarged plan sectional view illustrating another correlated position state of the main body, the lock ring, and the power tool head.

FIG. 8 is a three-dimensional external view of a second embodiment of the present invention.

FIG. 9 is an exploded external view of the main body, a lock ring, and a power tool head.

FIG. 10 is an enlarged vertical sectional view illustrating a combined state of the main body, the lock ring, and the power tool head.

FIG. 11 is an enlarged plan sectional view showing a position state of a fitting claw at the time of engagement and disengagement after the combination of FIG. 10;

FIG. 12 is a partially enlarged vertical sectional view showing an engagement state of a fitting claw according to a second embodiment of the present invention.

FIG. 13 is a partially enlarged vertical sectional view showing a detached state of the fitting claw.

FIG. 14 is a three-dimensional external view of a third embodiment of the present invention.

FIG. 15 is an external view illustrating a state where the grip and the main body are joined.

FIG. 16 is an external view illustrating a state where the main body and the power tool head are joined.

FIG. 17 is a partially enlarged vertical sectional view of a joint portion between the main body and the power tool head.

FIG. 18 is an enlarged plan sectional view of a concave tank at the upper edge of a fitting portion of the electric tool head.

FIG. 19 is an enlarged plan sectional view showing a structure of an inner contraction contact surface of an inner wall of a fitting portion of the electric tool head.

FIG. 20 is an enlarged plan sectional view showing a state in which the main body engagement fixing block has disengaged.

FIG. 21 is an external view of the case where the power tools of the present invention are installed on an electric screwdriver.

FIG. 22 is an external view when the electric polishing machine is installed.

FIG. 23 is an external view of the electric polisher when installed.

FIG. 24 is an external view showing a state applied to the electric jack.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grip 10 Grip 11 Outlet 11a Changeover switch 12 Localization key 121 Elastic part 122 Projecting end 13 Insertion hole 14 Slope 141 Projection mark 15 Introduction tenon 2 Main body 20 Main body 21 Motor shaft 211 Small gear 22 T-shaped insertion column 221 Tangential hole 23 Slope 231 Projection pattern 24 Arc-shaped introduction tank 241 Localization hole 25 Fixing hole 26 Fixing block 261 Guard surface 27 Engagement annular groove 3 Tool head 30 Lock ring 31 Fitting claw 311 Guard block 32 Drilling hole 33 Inner wall 34 Annular tenon 35 Engagement tank 351 Arc-shaped tank path 4 Lock ring 40 Tool head 402 Drilling 41 Fixed oblique piece 411 Bevel 42 Engagement claw 43 Oblique cone engaging part 44 Gear unit 51 Screw 52 Annular cap 53 Bearing 54 Packing 55 Packing 56 Elastic parts 57 Bearing stand Gear installation cylinder 61 C-shaped shaft cover 62 Iron ring packing 63 Shaft rod 631 Annular tank 632 Shaft rod plate 64 Front cap 65 Inner cap 66 Engagement groove 71 Gear cap 711 Annular internal gear 712 Pin 72 Planetary gear 73 Packing 74 Packing 75 Gear Cap 751 Parallel bar mortise 76 Planetary gear 77 Planetary gear 78 Separator plate 79 Separator plate 8 Main body 826 Engagement fixing block 827 Convex pattern 9 Tool head 931 Insertion section 932 Upper edge 933 Recessed tank 934 Inner wall 935 Inner shrink contact surface 936 Convex pattern 96 Screwdriver 97 polishing machine 98 polisher 99 jack

Claims (12)

[Utility model registration claims] 1. A grip, a main body, and a power tool head, wherein the grip has a power supply insertion hole at an upper end thereof and is used for insertion of an outlet, and a lower portion has a substantially columnar shape, and a lower end forms a slope. The main body forms a slope that corresponds to the grip end at the upper end, and is movably joined to the grip at the center,
A power motor is installed inside the grip that can change the angle by rotating with respect to the main body, the driving shaft of the motor is exposed outside the main body, an engaging unit is installed at the end of the main body, and a tool is installed at the end A power transmission or deceleration unit is installed inside the power tool head that can be mounted, and an engagement unit installed at the upper end of the power tool head can be removed or connected to the engagement unit of the main body, and the power of the main body driving shaft is A power tool for transmitting power to the end of the power tool head through an internal power transmission or a reduction gear unit. 2. An insertion hole is provided at the center of the slope at the end of the grip, and a T-shaped insertion pillar is installed at the center of the upper slope of the main body. The T-shaped insertion pillar is inserted into the insertion hole by the T-shaped insertion pillar. , The main body and the grip are combined, and a tangential hole is opened at the center of the T-shaped insertion post,
It penetrates through the insertion hole and is used for inserting the power cord.An arc-shaped introduction tank is installed at a position close to the edge on the slope of the main body.
2. The power tool according to claim 1, wherein an introduction tenon is provided at an opposite position on the end slope of the grip, and the introduction tenon slides in the arc-shaped introduction tank. 3. A resilient projecting end is provided on the end slope of the grip, and a positioning hole and a fixing hole are provided at corresponding positions on the slope of the main body, respectively. 2. The pistol grip according to claim 1, wherein the protruding end of the grip is inserted and fixed in the positioning hole, and when the grip and the main body form a pen shape, the protruding end is fixed in the fixing hole. A power tool as described. 4. The power tool according to claim 3, wherein the protruding and non-protruding states of the protruding end of the grip are controlled by a localization key provided on the grip. 5. The method according to claim 1, wherein a protrusion is provided on each of the slopes where the grip and the main body are in contact with each other, so that when the grip and the main body roll against each other, a stopping force due to friction is provided. The power tool according to 1. 6. A power tool according to claim 1, wherein a switch for controlling on / off of a power supply and for controlling forward rotation and reversal of a motor is provided on the grip. 7. The main body has a somewhat columnar shape, a plurality of fixing blocks are provided at an outer edge of a terminal thereof, and a plurality of fitting claws extend upward along the edge at an upper end of the power tool head. 2. The power tool according to claim 1, wherein a fitting claw of the power tool is engaged and fixed in a gap of the main body fixing block by a lock ring. 8. The lock ring is provided with a fixed oblique on an inner wall thereof, and the number of the fixed oblique is the same as the number of the fixed block of the main body. 8. The power tool according to claim 7, wherein the lower slope of the fixed oblique piece is adapted to engage and fix the upper end face of the main body fixing block during the rolling. 9. A guard block is provided at one side of an outer wall of at least some of the fitting claws, and rotation of the lock ring is restricted by the guard block and stopped. 7. The power tool according to 7. 10. The body has a somewhat cylindrical shape, and has a plurality of engagement annular grooves provided at an outer edge at a distal end thereof, including a lock ring, wherein the lock ring is an annular body,
An annular tenon and several engagement tanks are installed on the inner wall, a plurality of engagement claws are installed at the upper end of the power tool head, and an oblique cone engagement portion is formed at a front end of the engagement claw, At the time of the combination, the lock ring is joined by an annular tenon in the engagement annular groove of the main body, the fitting claw of the power tool head is inserted into the inner hole of the lock ring, and the oblique cone engagement at the front end thereof. 2. The power tool according to claim 1, wherein the portion contacts the inner wall of the lock ring and slides into the engagement tub of the lock ring to be tightly engaged. 11. A plurality of engaging and fixing blocks are provided below the distal end of the main body, and each engaging and fixing block extends and protrudes in a diametrical direction, and an outer surface of the engaging and fixing block gradually faces outward. At the upper end of the power tool head, a fitting part whose inside is open in an annular shape is installed, and the upper edge of the fitting part opens a concave tank corresponding to the shape of the engaging fixed block cross section, The inner wall of the fitting portion has a radially contracting contact surface, and when combined, the engaging and fixing block of the main body is fitted into the concave tank of the power tool head fitting portion, and both are rolled to each other,
The power tool according to claim 1, wherein the engagement fixing block is tightly engaged by friction of the shrinkable contact surface. 12. The engaging and fixing block of the main body is provided with a projection having a projection on an outer surface thereof, and a projection is also provided on an inner shrink contact surface of a power tool head fitting portion. The power tool according to claim 11, wherein the engagement action is enhanced.