Impact tool
An impact tool includes: a brushless motor; a spindle, which is rotated by the brushless motor; a hammer, which is held on the spindle; an anvil, which is impacted in a rotational direction by the hammer; a polymer housing, which houses the brushless motor; a hammer case, which is connected to the polymer housing and houses the hammer and the spindle; and a light unit, which is held on the hammer case and comprises a plurality of light-emitting devices. The maximum tightening torque of the anvil is 1,000 N·m or more and 2,500 N·m or less.
1. An impact driver comprising:
a brushless motor;
a spindle, which is rotated by the brushless motor;
a hammer, which is held on the spindle;
an anvil, which is impacted in a rotational direction by the hammer and has an insertion hole;
a chuck configured to hold a tool accessory inserted in the insertion hole;
a motor housing, which is made of a polymer and houses the brushless motor;
a hammer case, which is made of metal and is connected to the motor housing, the hammer and the spindle being disposed in the hammer case;
a light unit, which is held on the hammer case, illuminates the tool accessory and comprises:
a plurality of light-emitting devices,
a ring-shaped circuit board supporting the plurality of light-emitting devices,
a plurality of light-transmitting parts each composed of an optically transmissive synthetic polymer, the light-transmitting parts respectively facing the light-emitting devices and being configured to transmit illumination light emitted from the light-emitting devices, and
a light cover, which is disposed forward of the ring-shaped circuit board and has a plurality of openings that are spaced apart in different portions of the light cover; and
a battery-holding part, which is connected to the motor housing and on which a battery pack having a rated voltage of 18 V is mounted;
wherein:
the anvil has a maximum tightening torque of 210 Nm or more;
the light-transmitting parts are respectively disposed in the openings;
the light cover is composed of a material that differs from the optically transmissive synthetic polymer;
the light-transmitting parts and the light cover are integrated by molding such that the light-transmitting parts are held in part by the light cover; and
at least two of the light-transmitting parts are connected to each other by a coupling part that is composed of a material different from the light cover and is fixed to the light cover.
2. The impact driver according to claim 1 , wherein the coupling part is disposed between two of the openings.
3. The impact driver according to claim 2 , wherein a voltage applied to each of the light-emitting devices is between 2V and 10V.
4. The impact driver according to claim 3 , wherein an amperage applied to each of the light-emitting devices is between 10 mA and 50 mA.
5. The impact driver according to claim 4 , wherein at least three of the light-emitting devices are provided.
6. The impact driver according to claim 1 , wherein a voltage applied to each of the light-emitting devices is between 2V and 10V.
7. The impact driver according to claim 1 , wherein an amperage applied to each of the light-emitting devices is between 10 mA and 50 mA.
8. The impact driver according to claim 1 , wherein at least three of the light-emitting devices are provided.
9. The impact driver according to claim 8 , wherein the coupling part is disposed between two of the openings.
10. The impact driver according to claim 1 , wherein the plurality of light-emitting devices are respectively connected to the plurality of light-transmitting parts in a fixed relationship.
11. The impact driver according to claim 1 , wherein the plurality of light-transmitting parts are immovable relative to the plurality of light-emitting devices.
12. The impact driver according to claim 1 , wherein the light cover is connected to the ring-shaped circuit board such that the light cover is immovable relative to the ring-shaped circuit board.
13. The impact driver according to claim 12 , wherein:
the plurality of light-emitting devices are respectively connected to the plurality of light-transmitting parts in a fixed relationship; and
the plurality of light-transmitting parts are immovable relative to the plurality of light-emitting devices.
14. The impact driver according to claim 13 , wherein at least three of the light-emitting devices are provided.
15. The impact driver according to claim 14 , wherein the coupling part is disposed between two of the openings.
16. An impact driver comprising:
a brushless motor;
a spindle, which is rotated by the brushless motor;
a hammer, which is held on the spindle;
an anvil, which is impacted in a rotational direction by the hammer and has an insertion hole;
a chuck configured to hold a tool accessory inserted in the insertion hole;
a motor housing, which is made of a polymer and houses the brushless motor;
a metal hammer case, which is connected to the motor housing and houses the hammer and the spindle;
a battery-holding part, which is connected to the motor housing and on which a battery pack having a rated voltage of 18 V is mounted; and
a light unit, which is held on the hammer case and comprises:
first, second and third light-emitting devices,
a ring-shaped circuit board supporting the first, second and third devices,
first, second and third light-transmitting parts each composed of an optically transmissive synthetic polymer, and being configured to respectively transmit illumination light emitted from the first, second and third light-emitting devices, and
a light cover, which is disposed forward of the ring-shaped circuit board and has first, second and third openings that are spaced apart in different portions of the light cover;
wherein:
the anvil has a maximum tightening torque of 210 N·m or more;
the first light transmitting part is disposed in the first opening of the light cover and faces the first light-emitting device, the first light transmitting part being immovable relative to the first light-emitting device;
the second light transmitting part is disposed in the second opening of the light cover and faces the second light-emitting device, the second light transmitting part being immovable relative to the second light-emitting device;
the third light transmitting part is disposed in the third opening of the light cover and faces the third light-emitting device, the third light transmitting part being immovable relative to the third light-emitting device;
the light cover is composed of a material that differs from the optically transmissive synthetic polymer;
the first, second and third light-transmitting parts and the light cover are integrated by molding such that the light-transmitting parts are held in part by the light cover; and
the first and second light-transmitting parts are connected to each other by a coupling part that is composed of a material different from the light cover and is fixed to the light cover.
17. The impact driver according to claim 16 , wherein the light cover is connected to the ring-shaped circuit board such that the light cover is immovable relative to the ring-shaped circuit board.
18. The impact driver according to claim 16 , wherein the plurality of light-transmitting parts are immovable relative to the plurality of light-emitting devices.
19. The impact driver according to claim 16 , wherein the plurality of light-emitting devices are respectively connected to the plurality of light-transmitting parts in a fixed relationship.
20. The impact driver according to claim 19 , wherein at least three of the light-emitting devices are provided.