JP7357727B2 - mixer - Google Patents

Description

The present invention relates to a stirrer that rotates a final output shaft equipped with a mixing blade so that a material to be stirred can be stirred by the mixing blade.

For example, as disclosed in Patent Document 1, the stirrer is rotated by the drive of a motor housed in a housing, and a stirring blade (mixing blade) is removably attached to a final output shaft that projects forward from the housing. Materials to be stirred, such as ricin and mortar, can be stirred by the rotation of the stirring blades as the motor is driven.
In addition, a fan for cooling the motor is installed on the output shaft of the motor, and as the fan rotates as the output shaft rotates, outside air is sucked in through the intake port provided in the housing, and after cooling the motor, the fan is installed in the housing. It can be discharged to the outside from the exhaust port.

Japanese Patent Application Publication No. 2011-230091

In the conventional stirrer described above, when a battery pack is used as a power source, there is a risk that the material to be stirred may adhere to the battery pack or enter the battery mounting portion.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a stirrer in which there is no fear that the material to be stirred will adhere to the battery pack or enter the battery mounting portion even when a battery pack is used as a power source.

In order to achieve the above object, the invention according to claim 1 provides a motor including a stator, a rotor, and a fan disposed in front of the rotor ;
a cylindrical motor housing part that houses the motor and extends in the front-rear direction;
a loop-shaped handle connected to the rear part of the motor housing;
a front housing assembled to the front side of the motor housing section;
a spindle supported by the front housing and protruding forward and driven by a motor;
A battery mounting section located at the bottom of the handle that allows the battery pack to be slid in from the rear.
a battery cover provided in the battery mounting section and covering the entire battery pack from below;
a hinge part provided on the front side of the battery mounting part and rotatably connecting the battery mounting part and the battery cover to each other;
a locking part provided on the rear side of the battery cover and locking to the rear of the battery mounting part ,
The handle includes an upper connecting portion connected to an upper portion of the motor housing portion;
a grip part extending downward from the rear part of the upper connecting part and connected to the rear part of the battery mounting part;
a lower connecting part connected to the lower part of the motor accommodating part and connected to the front part of the battery mounting part,
While the power line that is electrically connected to the motor is routed inside the lower coupling part,
The lower connecting portion is characterized by an intake port that sucks in outside air as the fan rotates .
In the invention according to claim 2 , in the structure of claim 1 , the upper connecting portion extends in the front-rear direction parallel to the axis of the motor housing, and the lower connecting portion extends diagonally downward from the lower part of the motor housing to the rear. It is characterized by being elongated.
In order to achieve the above object, the invention according to claim 3 provides a motor including a stator, a rotor, and a fan disposed in front of the rotor;
a cylindrical motor housing part that houses the motor and extends in the front-rear direction;
a loop-shaped handle connected to the rear part of the motor housing;
a front housing assembled to the front side of the motor housing section;
a spindle supported by the front housing and protruding forward and driven by a motor;
A battery mounting section located at the bottom of the handle that allows the battery pack to be slid in from the rear.
a battery cover provided in the battery mounting section and covering the entire battery pack from below;
a hinge part provided on the front side of the battery mounting part and rotatably connecting the battery mounting part and the battery cover to each other;
a locking part provided on the rear side of the battery cover and locking to the rear of the battery mounting part,
The handle includes an upper connecting portion connected to an upper portion of the motor housing portion and extending in a front-rear direction parallel to an axis of the motor housing portion;
a grip part extending downward from the rear part of the upper connecting part and connected to the rear part of the battery mounting part;
a lower connecting part connected to the lower part of the motor accommodating part , extending diagonally downward from the lower part of the motor accommodating part to the rear , and connected to the front part of the battery mounting part;
While the power line that is electrically connected to the motor is routed inside the lower coupling part,
The lower connecting portion is characterized by an intake port that sucks in outside air as the fan rotates .
In the invention according to claim 4, in the configuration of any one of claims 1 to 3 , an exhaust port is provided above the intake port in the lower connecting portion for discharging air sucked in by rotation of the fan,
Inside the lower connection part, a partition rib is formed between the intake port and the exhaust port that partitions the interior into an intake path through which outside air drawn from the intake port flows and an exhaust path through which air flows from the fan to the exhaust port. It is characterized by being
In the invention according to claim 5 , in the configuration according to any one of claims 1 to 4 , the handle is provided with a switch, a trigger is provided in front of the switch, and the handle is configured such that the handle is configured such that the trigger is not pressed. The trigger is characterized in that it is provided with a lock lever that regulates and allows the trigger to be controlled, and is also provided with a lock-on button that can maintain the depressed state of the trigger.

According to the present invention, even if a battery pack is used as a power source, there is no fear that the material to be stirred will adhere to the battery pack or enter the battery mounting portion.

It is a perspective view of a stirrer. FIG. 3 is a central vertical cross-sectional view of the stirrer. FIG. 3 is an enlarged view of the lower connecting portion of FIG. 2; FIG. 3 is a side view of the stirrer with the battery cover open. FIG. 2 is a side view of an agitator with a mixing blade attached. FIG. 3 is a side view of the stirrer showing a state in which the front side of the battery pack is viewed through a mirror on the battery cover.

Embodiments of the present invention will be described below based on the drawings.
FIG. 1 is a perspective view showing an example of a stirrer, and FIG. 2 is a central vertical sectional view. This stirrer 1 has a cylindrical motor accommodating part 3 that accommodates a brushless motor 5, a main body housing 2 with a handle 4 connected to the rear thereof, and a front housing 6 assembled on the front side of the main body housing 2. have. A gear case 7 that accommodates a planetary gear reduction mechanism 8 and is screwed to the front housing 6 from the rear is provided between the main housing 2 and the front housing 6. The front housing 6 serves as a final output shaft. The spindle 9 is held and its front end protrudes forward. A shaft holder 10 is provided at the front end of the spindle 9 to connect a shaft 81 provided on a mixing blade 80, which will be described later. Further, a side handle 11 is attached to the front housing 6, and a guard plate 12 is fitted to cover the entire front housing 6 and a part of the main body housing 2 when viewed from the front, except for the part through which the spindle 9 passes. .

The main body housing 2 is assembled by fixing a pair of left and right half-housings 2a, 2b with left and right screws 13, 13, etc., and the front housing 6 is attached to the motor accommodating part by screws 14, 14, etc. from the front. It is fixed at 3. The motor accommodating portion 3 is also constituted by half housings 2a and 2b.
The handle 4 includes a grip part 15 extending in the vertical direction at the rear end, an upper connecting part 16 extending forward from the upper end of the grip part 15 and connected to the rear part of the motor housing part 3, and a lower part extending forward from the lower end of the grip part 15. It is formed into a loop shape and includes a battery mounting part 17 that extends forward at an angle, and a lower connecting part 18 that extends diagonally upward from the upper surface of the battery mounting part 17 and is connected to the lower part of the motor housing part 3. There is. The grip part 15 is provided with a switch 19 with a trigger 20 protruding forward, and above the switch 19 is a lock lever 21 that restricts the trigger 20 from being pressed in the normal state and allows the trigger 20 to be pressed when the release operation is performed. is provided. A lock-on button 19a is provided on the left side of the switch 19 and is operated from the left side of the main body housing 2 to maintain the depressed state of the trigger 20. A protruding portion of the trigger 20 from the grip portion 15 is covered by a rubber cover 22.

The battery mounting part 17 can be slid and mounted with the battery pack 23 from the rear, and has a terminal block 24 electrically connected to the mounted battery pack 23 inside, and a control circuit board 26 located above the terminal block 24. A controller 25 provided therein is housed in a posture tilted forward and downward similarly to the battery mounting portion 17. A hanging hook 27 is screwed to the right side of the battery mounting part 17, but this hanging hook 27 can be replaced to the left side of the battery mounting part 17.
Further, the battery mounting portion 17 is provided with a battery cover 28 that covers the mounted battery pack 23 from below. This battery cover 28 is rotatable by a hinge screw 31, with a cover-side protrusion 29 protruding from the upper front surface and a pair of mounting portion-side protrusions 30, 30 protruding from the lower front surface of the battery mounting portion 17 on both left and right sides thereof. A hook button 32 is integrally formed on the upper side of the rear end of the battery cover 28 in the shape of a connected box and elastically engaged with the lower side of the rear end of the battery mounting part 17 . Furthermore, a mirror 33 (FIG. 6) is provided on the inner bottom surface of the battery cover 28.

The brushless motor 5 is an inner rotor type consisting of a stator 35 and a rotor 36 inside thereof. The stator core 37 has a front insulator 38 and a rear insulator 39, and coils 40, 40, . . . that are wound around the stator core 37 via the front and rear insulators 38, 39. A sensor circuit board 41 mounted on the rear insulator 39 includes a rotation detection element (not shown) that detects the position of a permanent magnet 44 provided on the rotor 36 and outputs a rotation detection signal. It is installed in a shape.
The rotor 36 includes a rotating shaft 42 located at the axis, a substantially cylindrical rotor core 43 arranged around the rotating shaft 42 and made of a plurality of laminated steel plates, and a plate-shaped rotor core 43 fixed inside the rotor core 43. It has permanent magnets 44, 44, . The rear end of the rotating shaft 42 is supported by a bearing 45 held on the inner surface of the handle 4, and the front end is supported by a bearing 47 held by a cap 46 that closes the rear part of the gear case 7, and a pinion 48 is supported. The front end provided with this protrudes into the gear case 7. A centrifugal fan 49 is attached to a rear portion of the bearing 47 on the rotating shaft 42 .

Inside the motor housing section 3, as shown in FIG. 3, there are two rear holding ribs 50a and 50b that stand upright on the inner surface of each half housing 2a and 2b and hold the front and rear ends of the stator 35, and in front of the two rear holding ribs 50a and 50b. Front holding ribs 51 that hold the front insulator 38 are formed in the vertical direction, respectively. A fan housing chamber 52 for housing a centrifugal fan 49 is partitioned between the front holding rib 51 and the cap 46 . The lower ends of the front holding ribs 51 are bent rearward and connected to the lower ends of the rear holding ribs 50a, and the lower ends of the rear holding ribs 50a, 50b approach each other as they go downward, and are connected to the lower ends of the rear holding ribs 50a and 50b. It is connected.
On the inner surface of each half housing 2a, 2b, the rear holding ribs 50a, 50b connected to each other extend below the stator core 37 within the lower connecting portion 18, and then bend toward the front to form the lower connecting portion 18. Front partition ribs 53 connected to the front inner surface are integrally extended. On the front surface of the lower connecting portion 18, above the connection portion with the front partition rib 53, exhaust ports 54, 54, etc. extending in the left-right direction are arranged in the left and right directions around the mating surface of the half housings 2a, 2b. They are formed symmetrically and at equal intervals in a plurality of rows (four rows in this case) in the vertical direction. Therefore, on the front side of the front partition rib 53, an exhaust path 55 is formed which communicates with the fan storage chamber 52 and can exhaust the air sent outward from the centrifugal fan 49 to the outside from the exhaust port 54.

In addition, on the inner surface of each half housing 2a, 2b, behind the front partition rib 53, there is a section extending rearward from the front inner surface of the lower connecting section 18 near the connection part with the battery mounting section 17, and then extending upward at a substantially right angle. The rear partition ribs 56 extend upwardly in a manner that divides the inside of the lower connecting portion 18 into front and rear parts, and the rear partition ribs 56 whose upper ends are located behind the front partition ribs 53 and below the stator 35 extend integrally. ing. On the front surface of the lower connecting portion 18, between the front partition rib 53 and the rear partition rib 56, there are intake ports 57, 57, extending in the left-right direction, centered on the mating surfaces of the half housings 2a, 2b. A plurality of rows (here, five rows) are formed symmetrically and at equal intervals in the vertical direction. Therefore, an air intake path 58 is formed between the front partition rib 53 and the rear partition rib 56, which sucks outside air from the air intake port 57 and from behind the stator 35 as the centrifugal fan 49 rotates.
Furthermore, as shown in FIG. 4, on the left and right side surfaces of the lower connecting part 18, at the rear of the exhaust port 54 and the intake port 57, there is a direction from the top surface of the battery mounting part 17 to the front with the same slope as the lower connecting part 18. A pair of damming ribs 59, 59 are formed that extend diagonally upward, are bent forward above the exhaust port 54, and reach forward of the exhaust port 54.

A wiring space 60 is formed between the rear partition rib 56 and the rear inner surface of the lower connecting portion 18 , which communicates the interior of the battery mounting portion 17 with the rear portion of the stator 35 within the motor accommodating portion 3 . As shown in FIGS. 2 and 3, this wiring space 60 includes a plurality of power supply wires (lead wires) that electrically connect between the control circuit board 26 and each terminal 61 provided on the insulator 39 after the stator 35. 62, 62, . . . and a plurality of signal lines (lead wires) 63, 63, . . . that electrically connect between the control circuit board 26 and the sensor circuit board 41 are wired. Further, below the rear partition rib 56, a plurality of lead wires 64, 64, . . . are wired to electrically connect between the terminal block 24 and the control circuit board 26. Here, since the controller 25 is supported in the battery mounting part 17 with a forward downward slope, a wide wiring space can be secured for the lead wire 64, and the power wire 62, signal wire 63, and lead wire can be connected to the lower connecting part 18. 64 wiring can be done easily. In addition, in FIGS. 2 and 3, one power wire 62, one signal wire 63, and one lead wire 64 are shown, and other lead wires are omitted.

On the other hand, the planetary gear reduction mechanism 8 in the gear case 7 has three stages of carriers 71A to 71C in the axial direction that respectively support a plurality of planetary gears 72, 72 within internal gears 70A to 70C. The planetary gear 72 of the carrier 71A meshes with the pinion 48 of the rotating shaft 42. The third stage carrier 71C is coupled to the rear end of the spindle 9, which is supported by front and rear bearings 65, 65 within the front housing 6.
Further, the internal gear 70B that meshes with the planetary gear 72 of the second stage carrier 71B is rotatably and movably provided in the axial direction, and a mode switching ring 73 is engaged with the outer periphery of the internal gear 70B. There is. This mode switching ring 73 includes a clamping piece 74 that is clamped by front and rear coil springs 75 and protrudes downward. A switching dial 76 having an eccentric pin 77 on the upper surface is rotatably provided on the lower surface of the main body housing 2, and the clamping piece 74 of the mode switching ring 73 is interlocked with the movement of the eccentric pin 77 in the front-rear direction. It can be moved forward and backward.

Therefore, when the mode switching ring 73 is advanced by rotating the switching dial 76, the internal gear 70B engages with the engagement ring 78 provided in the gear case 7, and rotation is restricted, and the rotation of the second stage carrier 71B is restricted. A low-speed mode is established in which the planetary gear 72 is caused to perform planetary motion to enable second-stage deceleration. On the other hand, when the mode switching ring 73 is moved backward by rotating the switching dial 76, the internal gear 70B separates backward from the engagement ring 78 and engages with the first stage carrier 71A, and the second stage planetary gear 72 This is a high-speed mode in which the carrier 71A is rotated integrally with the first stage carrier 71A to cancel the deceleration of the second stage.

In the stirrer 1 configured as described above, the battery cover 28 is opened as shown in FIG. A shaft 81 provided on a mixing blade 80 is coupled to the front end of the spindle 9 via a shaft holder 10. In this state, when the trigger 20 is pressed to turn on the switch 19, the control circuit board 26 of the controller 25 detects the detection signal of the permanent magnet 44 obtained from the rotation detection element provided on the sensor circuit board 41. The rotor 36 is rotated by acquiring the rotational position of the rotor 36 and sequentially passing current through the switching elements mounted on the control circuit board 26 based on the rotational position. Therefore, the rotating shaft 42 rotates, and the rotation reduced by the planetary gear reduction mechanism 8 is transmitted to the spindle 9, and the mixing blade 80 coupled to the spindle 9 rotates, making it possible to stir the material to be stirred.

Further, when the rotating shaft 42 rotates and the centrifugal fan 49 rotates, the fan housing chamber 52 becomes under negative pressure, and outside air is sucked through the intake port 57. The sucked outside air passes through the intake path 58 from behind the brushless motor 5, passes between the stator 35 and the rotor 36, cools the brushless motor 5, reaches the fan housing chamber 52, and passes through the exhaust path 55. It is discharged to the outside from the exhaust port 54. Since the intake port 57 and the exhaust port 54 are vertically separated from each other on the front surface of the lower connecting portion 18, the exhaust from the exhaust port 54 is difficult to be sucked in from the intake port 57.
In addition, since the intake port 57 and the exhaust port 54 here are open on the front surface of the lower connecting part 18, even if the agitator 1 is placed horizontally on the ground, the intake port 57 and the exhaust port 54 are directly connected to the ground, etc. There is no contact. Therefore, the possibility that foreign matter or the like will enter through the intake port 57 or the exhaust port 54 is reduced.

Furthermore, even if the material to be stirred adheres to the outer surface of the motor accommodating portion 3 or the handle 4 during stirring work, the damming rib 59 provided on the lower connecting portion 18 prevents the material from flowing into the intake port 57 and the exhaust port 54. The flow is dammed. Therefore, the possibility that the material to be stirred will travel along the surface of the lower connecting portion 18 and enter from the intake port 57 and the exhaust port 54 is also reduced.
The guard plate 12 covers the entire region where the exhaust port 54 is formed and covers a part of the upper side of the region where the intake port 57 is formed (overlapping in the front and back direction), so that the The possibility that the material to be stirred scattered during work will reach the intake port 57 or the exhaust port 54 is also reduced.

On the other hand, in the battery mounting portion 17, since the battery pack 23 is entirely covered by the battery cover 28, there is no fear that the material to be stirred will adhere to the battery pack 23 or enter the terminal block 24 side. Further, when the battery cover 28 is opened, the front surface of the battery pack 23 can be seen even from the rear through a mirror 33 provided on the bottom surface of the battery cover 28, as shown in FIG. Therefore, the remaining capacity display section (not shown) provided on the front surface of the battery pack 23 can be easily viewed without tilting the stirrer 1 or bending the operator's body.

As described above, according to the agitator 1 of the above embodiment, the intake port 57 for sucking outside air by the rotation of the fan (centrifugal fan 49) is provided on the lower front surface of the motor (brushless motor 5) in the housing (main body housing 2). By providing an exhaust port 54 for the air drawn in by the rotation of the centrifugal fan 49, it is possible to prevent foreign matter from entering through the intake port 57 and the exhaust port 54 without providing a cover using sponge or wire mesh. Therefore, an increase in cost is suppressed, and the cooling effect of the brushless motor 5 can also be maintained since no ventilation resistance is caused by the cover. Further, since the maintenance required when a cover is provided is not required, the usability is improved. Furthermore, since the intake port 57 and the exhaust port 54 can be arranged in a concentrated manner in the lower connecting portion 18, the design becomes more cohesive.

Particularly here, the damming rib 59 is provided on the side surface of the main body housing 2 to suppress the movement of the material to be stirred attached to the side surface toward the intake port 57 side and the exhaust port 54 side. Intrusion of the material to be stirred into the intake port 57 and the exhaust port 54 can also be effectively suppressed.
Further, the intake port 57 and the exhaust port 54 are provided on the front surface of the main body housing 2, and a guard plate 12 is attached to the front of the main body housing 2, so that a part of the area where the intake port 57 is formed and the exhaust port 54 are provided. Since the entire formation area is covered with the guard plate 12 when viewed from the front, it is possible to more effectively suppress intrusion of the material to be stirred into the intake port 57 and the exhaust port 54.

In this stirrer 1, since the battery pack 23 is arranged at the lower part of the main body housing 2, the center of gravity is located on the lower side, and the balance of the main body housing 2 is improved, resulting in good operability. In particular, since the control circuit board 26 is placed above the battery pack 23, a greater sense of stability can be obtained.
Furthermore, since the battery pack 23 is placed at the bottom of the loop-shaped handle 4, wiring within the handle 4 is facilitated.

Note that the number, shape, and formation area of the intake ports and exhaust ports are not limited to the above embodiments. For example, in the above configuration, a centrifugal fan is installed on the front side of the stator, the exhaust port is placed on the top side, and the intake port is placed on the bottom side. may be provided on the upper side. Further, when the intake port and the exhaust port are adjacent to each other, the openings may be formed so as to be inclined in opposite directions in the thickness direction of the housing. The fan is not limited to a centrifugal fan either.
Furthermore, the formation region of the intake port and the exhaust port is not limited to the front surface of the housing, but may be any other region such as the rear surface of the lower connecting portion as long as the region excludes the side surface.
On the other hand, the shape of the lower connecting part is not limited to the above-mentioned form, and even if it is a straight line extending in the vertical direction without being inclined, it is possible to form an intake port and an exhaust port on the front surface. The damming rib may also be changed in shape or omitted.

Regarding other configurations, we also made changes such as preventing the battery mounting part and controller from tilting forward and downward, reversing the hinge of the battery cover, and making the battery cover transparent to make it easier to see whether or not there is a battery pack. Changes are also possible. The battery cover itself can also be omitted. Motors other than brushless can also be used.

1. Stirrer, 2. Main housing, 3. Motor housing, 4. Handle, 5. Brushless motor, 6. Front housing, 8. Planetary gear reduction mechanism, 9. Spindle, 15. ... Grip part, 17... Battery mounting part, 18... Lower connection part, 26... Control circuit board, 35... Stator, 36... Rotor, 42... Rotating shaft, 49... Centrifugal fan, 53... - Front partition rib, 54... Exhaust port, 55... Exhaust path, 56... Rear partition rib, 57... Intake port, 58... Intake path, 59... Damping rib, 60... Wiring space, 80 ...Mixing blade.

Claims (5)

A motor including a stator, a rotor, and a fan disposed in front of the rotor ;
a cylindrical motor accommodating portion that accommodates the motor and extends in the front-rear direction;
a loop-shaped handle connected to a rear part of the motor accommodating part;
a front housing assembled to the front side of the motor accommodating part;
a spindle supported by the front housing, protruding forward, and driven by the motor;
a battery mounting part that is arranged at the bottom of the handle and into which a battery pack can be slid and mounted from the rear;
a battery cover provided on the battery mounting part and covering the entire battery pack from below;
a hinge part provided on the front side of the battery mounting part and rotatably connecting the battery mounting part and the battery cover to each other;
a locking part provided on the rear side of the battery cover and locking to the rear of the battery mounting part ,
The handle includes an upper connecting part connected to an upper part of the motor accommodating part;
a grip part extending downward from the rear part of the upper connecting part and connected to the rear part of the battery mounting part;
a lower connecting part connected to a lower part of the motor accommodating part and connected to a front part of the battery mounting part,
A power line electrically connected to the motor is routed within the lower connecting part,
An agitator in which an intake port is formed in the lower connecting portion to draw in outside air as the fan rotates . The upper connecting portion extends in the front-rear direction parallel to the axis of the motor accommodating portion,
The agitator according to claim 1 , wherein the lower connecting portion extends obliquely downward and rearward from a lower portion of the motor accommodating portion. A motor including a stator, a rotor, and a fan disposed in front of the rotor;
a cylindrical motor accommodating portion that accommodates the motor and extends in the front-rear direction;
a loop-shaped handle connected to a rear part of the motor accommodating part;
a front housing assembled to the front side of the motor accommodating part;
a spindle supported by the front housing, protruding forward, and driven by the motor;
a battery mounting part that is arranged at the bottom of the handle and into which a battery pack can be slid and mounted from the rear;
a battery cover provided on the battery mounting part and covering the entire battery pack from below;
a hinge part provided on the front side of the battery mounting part and rotatably connecting the battery mounting part and the battery cover to each other;
a locking part provided on the rear side of the battery cover and locking to the rear of the battery mounting part,
The handle includes an upper connecting part connected to an upper part of the motor housing part and extending in a front-rear direction parallel to an axis of the motor housing part;
a grip part extending downward from the rear part of the upper connecting part and connected to the rear part of the battery mounting part;
a lower connecting part connected to a lower part of the motor housing part , extending diagonally downward from the lower part of the motor housing part to the rear , and connected to a front part of the battery mounting part;
A power line electrically connected to the motor is routed within the lower connecting part,
An agitator in which an intake port is formed in the lower connecting portion to draw in outside air as the fan rotates . An exhaust port is provided above the intake port in the lower connecting portion for discharging air sucked in by rotation of the fan,
Inside the lower connecting portion, between the intake port and the exhaust port, there is an intake path through which outside air drawn from the intake port flows, and an exhaust path through which air flows from the fan to the exhaust port. The stirrer according to any one of claims 1 to 3, wherein a partition rib is formed to partition the inside . The handle is provided with a switch, and a trigger is provided in front of the switch,
Any one of claims 1 to 4 , wherein the handle is provided with a lock lever that restricts and allows the trigger to be pushed in, and is also provided with a lock-on button that can maintain the pushed state of the trigger. Stirrer described in Crab.

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