1. A power tool comprising:
a circular saw blade, the circular saw blade defining a front side and a rear side of the power tool;
a light source; and
a light guide positioned on the front side of the power tool, the light guide configured to direct a beam of light from the light source to a position in front of the circular saw blade and provide a kerf indicator for the circular saw blade.
2. The power tool of claim 1 wherein the kerf indicator is a shaded line.
3. The power tool of claim 1 wherein the kerf indicator is an illuminated line.
4. The power tool of claim 1 wherein the light guide comprises an optical waveguide.
5. The power tool of claim 1 wherein the light guide comprises at least one reflective surface.
6. The power tool of claim 1 wherein the light guide is connected to a blade guard that at least partially covers the circular saw blade.
7. The power tool of claim 1 wherein the light source comprises at least one LED.
8. The power tool of claim 1 wherein the light source is positioned on the front side of the power tool such that the beam of light does not extend along either opposing side of the circular saw blade.
9. The power tool of claim 1 wherein the light guide includes a plurality of tick marks.
10. The power tool of claim 1 wherein the light guide is provided on the front side of the power tool as an elongated fin substantially aligned with the circular saw blade.
11. A power tool comprising:
a saw with a circular saw blade;
a table supporting the saw, the table including a table top, the table top including a table portion in front of the saw blade and a table portion behind the saw blade;
a light source; and
a light guide extending at least partially over the table portion in front of the saw blade, the light guide configured to receive light from the light source and direct a beam of light toward the table top in order to provide a kerf indicator for the saw.
12. The power tool of claim 11 wherein the light guide comprises an elongated fin-shaped member substantially aligned with the circular saw blade.
13. The power tool of claim 12 wherein the elongated fin-shaped member is removably coupled to the table.
14. The power tool of claim 12 wherein the elongated fin-shaped member is coupled to a blade guard on the saw.
15. The power tool of claim 12 wherein the elongated fin-shaped member comprises an optical prism.
16. The power tool of claim 15 wherein the optical prism includes a center line on a bottom surface, wherein the center line splits the beam of light into opposing sides separated by a shaded line, and the shaded line provides the kerf indicator.
17. The power tool of claim 15 wherein 12 wherein light guide separates the beam of light into an illuminated kerf indicator line with illuminated side areas on opposite sides of the kerf indicator line with shaded areas separating the illuminated kerf indicator from the illuminated side areas.
18. A power tool comprising
a saw blade, the saw blade defining a front side and a rear side of the power tool;
a blade guard at least partially covering the saw blade; and
an elongated light guide oriented substantially parallel to the saw blade, the light guide positioned in front of the blade guard and configured to direct a beam of light from a light source to an area in front of the saw blade in order to provide a kerf indicator for the saw blade.
19. The power tool of claim 18 wherein the elongated light guide is fin-shaped with two substantially parallel sidewalls.
20. The power tool of claim 19 wherein the elongated light guide comprises an optical prism.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A motor comprising
an inner rotor having inner permanent magnets arranged in a peripheral direction and an outer rotor having outer permanent magnets arranged in the peripheral direction, the mutual axes of rotation of the inner rotor and the outer rotor being arranged coaxially, and a rotating device capable of making at least one of the inner rotor and the outer rotor rotate around the axes of rotation so as to change the relative phase between the inner rotor and the outer rotor, wherein
the rotating device includes:
a first member which is integrally and rotatably provided with respect to the outer rotor; and
a second member which is integrally and rotatably provided with respect to the inner rotor and which defines pressure chambers inside the inner rotor with the first member, and wherein
a working fluid is supplied to the pressure chambers, thereby changing the relative phase between the inner rotor and the outer rotor.
2. The motor according to claim 1, wherein:
the first member is a vane rotor which is arranged inside the inner rotor, and is integrally provided in the outer rotor; and
the second member is a housing having concave portions which rotatably accommodate impeller portions of the vane rotor and which defines the pressure chambers with the vane rotor, and is integrally provided inside the inner rotor.
3. The motor according to claim 2, wherein
the vane rotor is integrally provided in the outer rotor via end plates which are fixed to the outer rotor so as to cover axial end surfaces, and is integrally provided in a rotating shaft to which the driving force of the outer rotor is transmitted.
4. The motor according to claim 3, wherein
the inner rotor and the housing which are integrated are arranged so as to be rotatable in the peripheral direction in a space between the vane rotor and the end plates.
5. The motor according to claim 2, wherein
the vane rotor is integrally provided in the outer rotor via end plates fixed to the outer rotor so as to cover one axial end surface, and
a rotating shaft which transmits the driving force of the outer rotor is integrally provided in the inner rotor and the housing from the other axial side.
6. The motor according to claim 2, wherein
the working fluid is supplied to the pressure chambers via the vane rotor.
7. The motor according to claim 1, wherein:
the first member is end plates which are integrally provided in the outer rotor and the rotating shaft so as to cover both end surfaces of the inner rotor and the outer rotor, and which transmits torque to the rotating shaft; and
the second member is a ring gear which is arranged between the inner rotor and the rotating shaft, is connected with the inner rotor and the rotating shaft by helical splines, defines the pressure chambers with the drive plates, and is moved axially by supply of the working fluid to the pressure chambers.
8. The motor according to claim 1, wherein:
the first member is a housing which is integrally provided in the outer rotor and a rotating shaft to which the driving force of the outer rotor is transmitted; and
the second member is pistons which are inserted into holes formed in the housing to define the pressure chambers with the holes, and abut on wall surfaces of the inner rotor.
9. The motor according to claim 1, wherein
the outer rotor and the inner rotor are such that the position where the outer permanent magnets and the inner permanent magnets face each other with mutually different polarities is set to an origin position.
10. The motor according to claim 9, wherein
the rotational direction when the inner rotor returns to the origin position from a state where same polarities of the outer permanent magnets and the inner permanent magnets are made to face each other with respect to the outer rotor is made to coincide with the direction of the moment of inertia caused during deceleration rotation.
11. The motor according to claim 2, wherein
the end plates and end surfaces of the outer rotor are joined via shims.
12. The motor according to claim 11, wherein
through holes are formed at sides of a gap between the outer rotor and the inner rotor in the end plates.
13. The motor according to claim 12, wherein
the outer rotor and the end plates are connected together by bolt fastening portions with every predetermined intervals with the shims interposed therebetween, and
curved portions are formed in the position of in the shims nearer to the axial center than the bolt fastening portions.
14. The motor according to claim 13,
wherein the through holes are formed between the adjacent bolt fastening portions.
15. The motor according to claim 4, wherein
an axially recessed concave portion is formed in any one of the inner rotor and the end plate, and the convex portion which protrudes axially and slides inside the concave portion during rotation is formed in the other of the inner rotor and the end plate.
16. The motor according to claim 15, wherein
the convex portion is formed in an annular shape.
17. The motor according to claim 16, wherein
the convex portion is formed by a ring member fitted into the inner rotor.
18. The motor according to claim 16, wherein
a labyrinth seal is formed by the convex portion and the concave portion.