Abstract: A light-emitting device includes: a resin package; and a first light-emitting element and a second light-emitting element. The resin package includes: a resin portion; a first lead having an upper surface and an end surface; a second lead having an upper surface and an end surface; and a recess having lateral surfaces and a bottom surface that includes a portion of the upper surface of the first lead and a portion of the upper surface of the second lead that are exposed from the resin portion. The first light-emitting element and the second light-emitting element are disposed in the recess. The first lead and the second lead are arranged in a first direction. The first light-emitting element and the second light-emitting element are arranged in a second direction perpendicular to the first direction.

Abstract: A reciprocating cutting tool reduces dispersion of dust. The reciprocating cutting tool includes a reciprocation converter drivable by a motor, a rod-like slider connected to the reciprocation converter to be reciprocable, a blade holder at the front end of the slider to hold a blade, a power transmission housing housing the reciprocation converter and allowing the slider to protrude from its front end, a cover outward from the power transmission housing, and a fan rotatable together with a rotor in the motor. A first passage of cooling air from the fan is defined between the power transmission housing and the cover. The first passage branches into a second passage toward the blade holder and a third passage not toward the blade holder.

Abstract: A bracket (20) includes: a pedestal (21, 22) that is mountable on a support frame (2) of a work stand (1) for supporting a saw (60); and first and second engaging parts (38A, 38B) arranged on the pedestal to sandwich the support frame in a horizontal direction and engage with first and second engagement parts (8A, 8B) on opposite sides of the support frame. The second engaging part includes first and second levers (41, 42). The pedestal is movable along the longitudinal direction of the support frame by manipulating only the first lever to disengage it from the second engagement part (8B) and is removable from the support frame by simultaneously manipulating both the first and second levers in the same direction to disengage them from the second engagement part. The first and second levers both move in the same opposite direction to engage the second engagement part.

Abstract: A light-emitting device includes: a resin package; and a first light-emitting element and a second light-emitting element. The resin package includes: a resin portion; a first lead having an upper surface and an end surface; a second lead having an upper surface and an end surface; and a recess having lateral surfaces and a bottom surface that includes a portion of the upper surface of the first lead and a portion of the upper surface of the second lead that are exposed from the resin portion. The first light-emitting element and the second light-emitting element are disposed in the recess. The first lead and the second lead are arranged in a first direction. The first light-emitting element and the second light-emitting element are arranged in a second direction perpendicular to the first direction.

Abstract: A light-emitting device includes: a resin package including: a resin portion, a first lead having an upper surface and an end surface, a second lead having an upper surface and disposed opposite the first lead, and a recess having lateral surfaces and a bottom surface that includes a portion of the upper surface of the first lead and a portion of the upper surface of the second lead that are exposed from the resin portion; and a first light-emitting element and a second light-emitting element that are disposed in the recess.

Abstract: An electrical power tool configured such that two battery packs as a power source are attached thereto may include overhanging elements respectively laterally positioned along lateral sides of the battery packs.

Abstract: In a strain wave gearing, the addendum tooth profile of an inner gear is defined by a formula and that of an outer gear is by another formula at a principal cross-section located at a tooth-trace-direction center of the outer gear, on the basis of a movement locus (Mc) of ?=1 by the teeth of the outer gear with respect to those of the inner gear. The tooth profiles of the dedenda of each of the inner gear and the outer gear are set to any shape that does not interfere with the tooth profile of the addendum of the other gear. It is possible to avoid superimposed flexion-induced bending stresses and tensile stresses caused by load torque arising at the long-axis locations of the outer gear, and the transmission torque capacity of a strain wave gearing can be improved.

Abstract: The dedendum tooth profiles of the internal teeth and external teeth of a strain wave gearing are prescribed by a first homothetic curve BC and a second homothetic curve AC obtained from a curve segment from a point A, at which the angle formed by the tangent to a movement locus Mc when meshing is approximated by rack meshing and the major axis is ?A, to a low point B. The dedendum tooth profile of the internal teeth is prescribed by a curve formed on the internal teeth in the course of the addendum tooth profile of the external teeth moving from an apex of the movement locus to point A. The dedendum tooth profile of the external teeth is prescribed by a curve formed on the external teeth when the addendum tooth profile of the internal teeth moves from the apex to arrive at point A.

Abstract: A bracket (20) includes: a pedestal (21, 22) that is mountable on a support frame (2) of a work stand (1) for supporting a saw (60); and first and second engaging parts (38A, 38B) arranged on the pedestal to sandwich the support frame in a horizontal direction and engage with first and second engagement parts (8A, 8B) on opposite sides of the support frame. The second engaging part includes first and second levers (41, 42). The pedestal is movable along the longitudinal direction of the support frame by manipulating only the first lever to disengage it from the second engagement part (8B) and is removable from the support frame by simultaneously manipulating both the first and second levers in the same direction to disengage them from the second engagement part. The first and second levers both move in the same opposite direction to engage the second engagement part.

Abstract: In a strain wave gearing, the addendum tooth profile of an internal gear is defined by the formula a and that of an external gear is by the formula b at a principal cross-section located at a tooth-trace-direction center of the external gear, on the basis of a movement locus (Mc) of ?=1 of the teeth of the external gear with respect to those of the internal gear in the principle cross-section taken at the center of the tooth trace of the external gear obtained when the tooth meshing is approximated by rack meshing. It is possible to avoid superimposition of flexion-induced bending stresses and tensile stresses caused by load torque at the major-axis locations of the external gear, and the transmission torque capacity of a strain wave gearing can be improved.

Abstract: In a strain wave gearing, the addendum tooth profile of an internal gear is defined by the formula a and that of an external gear is by the formula b at a principal cross-section located at a tooth-trace-direction center of the external gear, on the basis of a movement locus (Mc) of ?=1 by the teeth of the external gear with respect to those of the internal gear. It is possible to avoid superimposition of flexion-induced bending stresses and tensile stresses caused by load torque at the major-axis locations of the external gear, and the transmission torque capacity of a strain wave gearing can be improved.

Abstract: A light-emitting device includes: a resin package including: a resin portion, a first lead having an upper surface and an end surface, a second lead having an upper surface and disposed opposite the first lead, and a recess having lateral surfaces and a bottom surface that includes a portion of the upper surface of the first lead and a portion of the upper surface of the second lead that are exposed from the resin portion; and a first light-emitting element and a second light-emitting element that are disposed in the recess.

Abstract: A resin package includes: a resin portion, a first lead having an upper surface and an end surface, a second lead having an upper surface and disposed opposite the first lead, and a recess having lateral surfaces and a bottom surface that includes a portion of the upper surface of the first lead and a portion of the upper surface of the second lead that are exposed from the resin portion. In a top view, the upper surface of the first lead includes a first groove overlapping a first side of the bottom surface, a second groove overlapping a second side of the bottom surface, a third groove overlapping a third side of the bottom surface, and one or more fourth grooves extending from a portion of the third groove to an end surface of the first lead facing the second lead.

Abstract: A resin package includes: a resin portion, a first lead having an upper surface and an end surface, a second lead having an upper surface and disposed opposite the first lead, and a recess having lateral surfaces and a bottom surface that includes a portion of the upper surface of the first lead and a portion of the upper surface of the second lead that are exposed from the resin portion. In a top view, the upper surface of the first lead includes a first groove overlapping a first side of the bottom surface, a second groove overlapping a second side of the bottom surface, a third groove overlapping a third side of the bottom surface, and one or more fourth grooves extending from a portion of the third groove to an end surface of the first lead facing the second lead.

Abstract: A strain wave gearing is a negative deflection strain wave gearing. The tooth profile shape for the internally toothed gear is defined by using a convex, basic tooth profile curve, which is a curve portion from an inflection point (A) to a bottom-part point (B) of a moving locus (Mc) of an externally toothed gear with regard to an internally toothed gear obtained by a rack meshing approximation. The tooth profile shape for the externally toothed gear at a principal cross section is defined by a concave, basic tooth profile curve, which is generated in the externally toothed gear by the convex, basic tooth profile curve of the internally toothed gear moving from an apex (C) to an inflection point (A) of the moving locus (Mc). Passing-type meshing that is effective in lubrication is established, and bending stress in the tooth-bottom rim of the externally toothed gear can be reduced.

Abstract: In a strain wave gearing, the addendum tooth profile of an internal gear is defined by the formula a and that of an external gear is by the formula b at a principal cross-section located at a tooth-trace-direction center of the external gear, on the basis of a movement locus (Mc) of ?=1 of the teeth of the external gear with respect to those of the internal gear in the principle cross-section taken at the center of the tooth trace of the external gear obtained when the tooth meshing is approximated by rack meshing. It is possible to avoid superimposition of flexion-induced bending stresses and tensile stresses caused by load torque at the major-axis locations of the external gear, and the transmission torque capacity of a strain wave gearing can be improved.

Abstract: In a strain wave gearing, the addendum tooth profile of an internal gear is defined by the formula a and that of an external gear is by the formula b at a principal cross-section located at a tooth-trace-direction center of the external gear, on the basis of a movement locus (Mc) of ?=1 by the teeth of the external gear with respect to those of the internal gear. It is possible to avoid superimposition of flexion-induced bending stresses and tensile stresses caused by load torque at the major-axis locations of the external gear, and the transmission torque capacity of a strain wave gearing can be improved.

Abstract: An electrical power tool configured such that two battery packs as a power source are attached thereto may include overhanging elements respectively laterally positioned along lateral sides of the battery packs.

Abstract: In a strain wave gearing, the addendum tooth profile of an inner gear is defined by a formula and that of an outer gear is by another formula at a principal cross-section located at a tooth-trace-direction center of the outer gear, on the basis of a movement locus (Mc) of ?=1 by the teeth of the outer gear with respect to those of the inner gear. The tooth profiles of the dedenda of each of the inner gear and the outer gear are set to any shape that does not interfere with the tooth profile of the addendum of the other gear. It is possible to avoid superimposed flexion-induced bending stresses and tensile stresses caused by load torque arising at the long-axis locations of the outer gear, and the transmission torque capacity of a strain wave gearing can be improved.

Abstract: A rechargeable grinder includes a brushless motor, a main body housing configured to accommodate the brushless motor, a main switch and a micro switch configured to distribute power to the brushless motor, and a switch lever capable of moving with respect to the main switch and the micro switch, wherein a lock off lever capable of operating the micro switch in association with movement of the switch lever toward a switch is provided so as to be movable between a lock release position in which the micro switch can be operated and a lock position in which the micro switch cannot be operated.