Abstract: In one embodiment, a writing instrument refill includes a first portion having flexibility, and a second portion having a cross-sectional area larger than a cross-sectional area of the first portion, wherein the center of figure of the cross section of the first portion is offset from the center of the figure of the cross section of the second portion, the first portion and the second portion are formed integrally, and a part of the first portion has an outer diameter smaller than an outer diameter of the other part of the first portion.

Abstract: A mechanical pencil includes a writing lead, a chuck unit for chucking the writing lead, and a cushion spring configured to elastically support the chuck unit in such a manner that the chuck unit is retractable with a writing pressure. An output of the cushion spring, in response to a cushion stroke, is non-linear, and a slope of a spring constant, in a region where the cushion stroke is relatively small, is smaller than a slope of a spring constant in a region where the cushion stroke is relatively large.

Abstract: A mechanical pencil includes a writing lead, a chuck that chucks the writing lead and feeds the writing lead forward, and a shaft tube for housing the writing lead and the chuck. When a click operation for feeding the chuck forward is performed, a jet stream flowing forward is generated inside the shaft tube.

Abstract: A hand tool includes an outer barrel, an inner barrel housed in the outer barrel, and a rear barrel assembled to the outer barrel and the inner barrel. One of the outer barrel and the inner barrel includes a cam follower protruding in a radial direction of the hand tool, the other of the outer barrel and the inner barrel includes a cam groove engaging with the cam follower, and the cam follower is supported to be movable in a radial direction.

Abstract: A mechanical pencil includes a writing lead, a chuck that chucks the writing lead and feeds the writing lead forward, and a shaft tube for housing the writing lead and the chuck. When a click operation for feeding the chuck forward is performed, a jet stream flowing forward is generated inside the shaft tube.

Abstract: A method for manufacturing a writing instrument includes inject molding a cushion spring of the writing instrument to form the cushion spring as one piece, and axially pushing out the cushion spring from a molding die set. The cushion spring elastically supports a tip of the writing instrument in an axial direction to a barrel of the writing instrument. The forming of the cushion spring includes forming a plurality of apertures in the cushion spring, one of the apertures being relatively arranged with another one of the apertures by rotations of angles at 90 degrees about the axial direction on an outer peripheral surface thereof, and forming a plurality of displacement regulating protrusions, one of the protrusions being relatively arranged with another one of the protrusions by rotations of angles at 90 degrees about the axial direction.

Abstract: A hand tool includes an outer barrel, an inner barrel housed in the outer barrel, and a rear barrel assembled to the outer barrel and the inner barrel. One of the outer barrel and the inner barrel includes a cam follower protruding in a radial direction of the hand tool, the other of the outer barrel and the inner barrel includes a cam groove engaging with the cam follower, and the cam follower is supported to be movable in a radial direction.

Abstract: A mechanical pencil includes a writing lead, a chuck unit for chucking the writing lead, and a cushion spring configured to elastically support the chuck unit in such a manner that the chuck unit is retractable with a writing pressure. An output of the cushion spring, in response to a cushion stroke, is non-linear, and a slope of a spring constant, in a region where the cushion stroke is relatively small, is smaller than a slope of a spring constant in a region where the cushion stroke is relatively large.

Abstract: A writing instrument includes a barrel, a tip, and a cushion spring that elastically supports the tip in the axial direction to the barrel. The cushion spring is formed as one piece by injection molding, the cushion spring includes an aperture on its outer peripheral surface, and a displacement regulating protrusion that protrudes and extends into the aperture along the axial direction. The protrusion prevents the cushion spring from compression beyond a prescribed length.

Abstract: A mechanical pencil according to an embodiment includes a barrel; a chuck mechanism that is housed inside the barrel and is capable of chucking and feeding out a writing lead for a mechanical pencil; and first and second cushion springs that elastically support the chuck mechanism in an axial direction with respect to the barrel, wherein a first cushioning region having a first spring constant and a second cushioning region having a second spring constant are formed by combining the first and second cushion springs, and the first and second cushioning regions are connected with no skipping.

Abstract: A writing instrument according to an embodiment of the invention including, a chuck that chucks a writing lead, wherein the chuck includes a first chuck pawl which comes into point contact or line contact with the writing lead to press the writing lead so as to apply first contact stress to the writing lead; and a second chuck pawl which presses the writing lead so as to apply, to the writing lead, second contact stress that is lower than the first contact stress, and the first contact stress is configured such that, when a prescribed impact is applied to the writing lead, a contact portion of the writing lead subjected to the first contact stress fractures and absorbs the prescribed impact.

Abstract: A writing instrument according to an embodiment of the invention including, a chuck that chucks a writing lead, wherein the chuck includes a first chuck pawl which comes into point contact or line contact with the writing lead to press the writing lead so as to apply first contact stress to the writing lead; and a second chuck pawl which presses the writing lead so as to apply, to the writing lead, second contact stress that is lower than the first contact stress, and the first contact stress is configured such that, when a prescribed impact is applied to the writing lead, a contact portion of the writing lead subjected to the first contact stress fractures and absorbs the prescribed impact.

Abstract: A writing instrument according to an embodiment of the invention including, a chuck that chucks a writing lead, wherein the chuck includes a first chuck pawl which comes into point contact or line contact with the writing lead to press the writing lead so as to apply first contact stress to the writing lead; and a second chuck pawl which presses the writing lead so as to apply, to the writing lead, second contact stress that is lower than the first contact stress, and the first contact stress is configured such that, when a prescribed impact is applied to the writing lead, a contact portion of the writing lead subjected to the first contact stress fractures and absorbs the prescribed impact.

Abstract: A liquid applying tool which can create pressurizing action with a simple structure and without any labor at the time of using the liquid applying tool, and allows liquid to be smoothly fed to a tip end of a liquid applicator member with the assistance of the pressurizing action.

Abstract: A mechanical pencil is including a tubular shaft, a chuck unit movably arranged in the shaft, a front rotary element adapted to be moved rearward as the unit is moved rearward, a rear rotary element adapted to be moved rearward as the front rotary element is moved rearward, a conversion means for causing the rear rotary element to rotate in a normal rotational direction as the rear rotary element is moved rearward and allowing the rear rotary element to rotate in a reverse rotational direction as the rear rotary element is moved forward, a normal directional rotation transmitting means for allowing the front rotary element to be rotated in the normal rotational direction and the rear rotary element to be idly rotated, and a reverse directional rotation restricting mechanism allowing the normal directional rotation of the front rotary element but preventing the reverse directional rotation of the front rotary element.