Patents by Inventor Tetsuo Haraikawa
Tetsuo Haraikawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 4725952Abstract: An anti-skid braking device for use in a vehicle comprising a braking mechanism for supplying a braking force to a wheel of the vehicle, a moderator for moderating the braking force supplied from the braking mechanism to the wheel for a moderation time interval in a case where the acceleration relevant to the rotation of the wheel reaches a predetermined negative angular acceleration value during supply of the braking force to the wheel by the mechanism.Type: GrantFiled: May 4, 1987Date of Patent: February 16, 1988Assignee: Tokico Ltd.Inventors: Yutaka Kitano, Yoshikazu Miyamoto, Yoshimoto Ohta, Tetsuo Haraikawa
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Patent number: 4630706Abstract: A vehicle braking system of the type including a pneumatic booster which includes a shell casing, a flexible diaphragm, a power piston connected to the diaphragm to define a constant pressure chamber and a variable pressure chamber in the shell casing, an input shaft, a valve mechanism provided in the power piston and associated with the input shaft to control the pressure in the variable pressure chamber, an output shaft receiving the output force from the power piston, and a reaction mechanism for transmitting reaction force of the output shaft to the input shaft. The booster further includes a control chamber, and a control piston partitioning the interior of the control chamber into a second constant pressure chamber and a second variable pressure chamber.Type: GrantFiled: December 19, 1984Date of Patent: December 23, 1986Assignee: Tokico Ltd.Inventors: Toshio Takayama, Tetsuo Haraikawa
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Patent number: 4390084Abstract: A mechanical disc brake, including a caliper supported on a stationary member to slide in the direction of the axis of rotation of a rotatable disc and straddling the circumference of the disc to define two limb portions on the opposite sides of the disc, a first friction pad being pressed against one surface of the disc by one of the limb portions, a second friction pad disposed so as to be opposed to the first friction pad and being pressed against another surface of the disc, a force converting mechanism provided in the other limb portion of the caliper for converting the rotation of a lever to thrust force pressing the second friction pad, a rod extending in the direction of the axis of the disc and threadingly engaging the force converting mechanism with one end thereof engaging the second friction pad, a spring retainer threadingly engaging the other end of the rod, and a coil spring acting between the spring retainer and the other limb portion of the caliper to bias the rod in the direction separatingType: GrantFiled: February 9, 1981Date of Patent: June 28, 1983Assignee: Tokico Ltd.Inventors: Tetsuo Haraikawa, Koichi Tamura
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Patent number: 4360082Abstract: A disc brake including a caliper member slidably supported on a stationary member, at least one pin provided on either of the caliper member and a stationary member, and a guide member mounted on the other of the caliper member and the stationary member and slidably engaging with the pin. A guide portion provided on the other of the caliper member and the stationary member and detachably mounting the guide member. The guide member can be detached from the guide portion by displacing the guide member in a direction transverse to the axis of the pin.Type: GrantFiled: July 21, 1980Date of Patent: November 23, 1982Assignee: Tokico Ltd.Inventors: Tetsuo Haraikawa, Hiroshi Ito, Koichi Tamura
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Patent number: 4343381Abstract: A disk brake comprising a stationary member secured to a non-rotatable part of a vehicle, a caliper supported on the stationary member through a pin to displace toward and away from a rotatable disc, a friction pad supported on a stepped portion formed on the stationary member to displace toward and away from the rotatable disc, a piston provided in the caliper to act on the friction pad, and a guide bore formed in the stationary member to slidably receive therein the pin secured to the caliper. A dust boot is provided to cover and protect the gap between the pin and the guide bore, and one end of the dust boot secured to the stationary member has a projection projecting toward the stepped portion, thereby restricting the displacement of the friction pad separating from the disc.Type: GrantFiled: June 16, 1980Date of Patent: August 10, 1982Assignee: Tokico Ltd.Inventors: Tetsuo Haraikawa, Koichi Tamura
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Patent number: 4311214Abstract: A disc brake including a stationary member secured to a non-rotatable part of a vehicle, and a friction pad disposed on each side of a rotatable disc. There is provided a wear warning piece one end of which is secured to the stationary member and the other end of which extends between the disc and a backing plate of the friction pad by a predetermined distance.Type: GrantFiled: January 18, 1980Date of Patent: January 19, 1982Assignee: Tokico Ltd.Inventors: Tetsuo Haraikawa, Koichi Tamura
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Patent number: 4296844Abstract: A floating caliper type disc brake including a caliper being slidably supported on a stationary member, a resilient member interposed between a sliding portion of the caliper and the stationary member, the caliper having a bridge portion extending over a portion of the circumference of a disc and a pawl portion rigidly connected to the bridge portion for acting on one of friction pads, and a pad spring interposed between the bridge portion of the caliper and friction pads. The improvement comprises in that a projection is formed on backing plate of the one friction pad, and a retaining portion is formed in the pawl portion of the caliper for engaging with the projection of the friction pad thereby receiving the biassing force of the pad spring.Type: GrantFiled: September 11, 1979Date of Patent: October 27, 1981Assignee: Tokico Ltd.Inventors: Koichi Tamura, Tetsuo Haraikawa
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Patent number: 4284176Abstract: A mechanically operated disc brake of the type including a caliper slidably supported in the axial direction of a disc and straddling a peripheral portion of the disc, a pair of friction pads one of which is urged against the disc by a limb of the caliper, a cavity formed in another limb of the caliper, a nut member mounted in the cavity and being adapted to receive a rotational input force, a converting mechanism received in the cavity for converting the rotational movement of the nut member into axial movement thereof, a rod member screw-threadingly engaging with the nut member with the inner end abutting with the other friction pad for urging the same against the disc, and a rotation control member for controlling rotation of the nut member.Type: GrantFiled: August 20, 1979Date of Patent: August 18, 1981Assignee: Tokico Ltd.Inventors: Tetsuo Haraikawa, Koichi Tamura
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Patent number: 4228875Abstract: A mechanical disc brake includes a caliper floatingly supported on a stationary member, and a force converting mechanism mounted on the caliper and comprising a rotatable member rotatable in response to a rotary input force, an inclined surface formed on one side of the rotatable member, a ramp member disposed adjacent to the rotatable member with an inclined surface formed thereon for cooperating with the inclined surface of the rotatable member, and at least one ball member interposed between the inclined surfaces for reducing frictional resistance in converting the rotary input force into a linear output force. A dust cover is disposed to cover the ball and the inclined surfaces and has a first end mounted on the rotatable member and a second end mounted on the ramp member.Type: GrantFiled: August 21, 1979Date of Patent: October 21, 1980Assignee: Tokico Ltd.Inventors: Tetsuo Haraikawa, Tomio Hasaka
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Patent number: 4222465Abstract: A disc brake of the type including a stationary supporting member, a pair of friction pads supported on the supporting member and slidable in the direction of the axis of a rotatable disc, a caliper supported on the supporting member and slidable in the direction of the axis of the disc, a piston provided in the caliper for acting on one of friction pads to urge it against one surface of the disc, and a pad spring disposed between the caliper and the friction pads. The other of the friction pads is mounted on the supporting member such that the pad can be removed from the supporting member by displacing the friction pad and the caliper on the supporting member a predetermined distance past the normal operational range. The pad spring engages with the supporting member and with the other friction pad thereby limiting the displacement of the other friction pad with respect to the supporting member.Type: GrantFiled: April 20, 1979Date of Patent: September 16, 1980Assignee: Tokico Ltd.Inventors: Tetsuo Haraikawa, Koichi Tamura
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Patent number: 4162720Abstract: A mechanical disc brake includes a floating caliper having a pair of legs which are disposed on the opposite sides of a disc and one of which has an axial throughhole and the other of which has a friction pad facing one side of the disc. A support is secured to a vehicle and has a friction pad facing the other side of the disc. A bolt extends through the legs, a ramp is secured to the other leg against rotation, a rotational input receiving lever is secured to the one leg, a linear output generation member is secured to the lever for movement therewith, balls are disposed between the ramp and linear output generation members, a pawl member is secured to the lever for movement therewith and has pawls, a nut has ratchet teeth for engaging the pawls.Type: GrantFiled: November 10, 1977Date of Patent: July 31, 1979Assignee: Tokico Ltd.Inventor: Tetsuo Haraikawa
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Patent number: 4148380Abstract: An automatic shoe clearance adjusting device in a shoe drum brake of the type including a first strut member, a second strut member telescopically projecting from the first strut member, an adjusting nut rotatably mounted on the first strut member and engaging in screw threaded engagement with the second strut member, a member for rotating the adjusting nut in one direction, and a structure for controlling the rotation of the adjusting nut in the opposite direction. The rotation control structure is associated with a heat responsive element such that when the temperature in the brake exceeds a predetermined level, the adjustment of shoe clearance will not be effected.Type: GrantFiled: December 14, 1977Date of Patent: April 10, 1979Assignee: Tokico Ltd.Inventor: Tetsuo Haraikawa
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Patent number: 4088204Abstract: An improved mechanical disc brake, of the type in which a rotational operating force applied to a nut member adjustably carrying a push rod is converted into linear axial movement of the nut member and push rod to cause the push rod to move a brake pad engaged thereby into braking engagement with the disc, is provided in which the nut member is floatingly mounted on the housing of the brake for minimizing the wear and other adverse effects of natural vibration of the housing, and in which there is a device for urging the nut member into a self-centering position for maintaining the push rod in optimum relationship with the associated brake pad. The improved brake construction also facilitates provision for proper dust covers, lessens the precision required in the manufacture of certain parts, and permits proper adjustment of the brake to be accomplished even after replacement of the brake pads.Type: GrantFiled: February 15, 1977Date of Patent: May 9, 1978Assignee: Tokico Ltd.Inventor: Tetsuo Haraikawa
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Patent number: 4086986Abstract: A floating caliper disc brake is provided with an improved device for shiftably mounting the housing on the support and for transmitting the lateral forces exerted on the housing during braking to the support, which is entirely independent of the relationship between the bolts interconnecting the caliper portions of the housing and the holes in the support through which they pass. Such bolts merely pass through the holes in the support loosely, so that the lateral forces generated by braking will not distort or bend such bolts and thereby also distort the housing or cause binding between the shiftable housing and the support.Type: GrantFiled: August 10, 1976Date of Patent: May 2, 1978Assignee: Tokico Ltd.Inventor: Tetsuo Haraikawa
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Patent number: 4084664Abstract: An improved disc brake of the type in which a rotatonal operating force is converted into a substantially linear braking force is provided with means for automatically adjusting the brake operating mechanism for normal wear of the brake pad means.Type: GrantFiled: February 15, 1977Date of Patent: April 18, 1978Assignee: Tokico Ltd.Inventor: Tetsuo Haraikawa
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Patent number: 4074532Abstract: A master cylinder has a first piston and a second piston slidably disposed respectively in two piston chambers of different diameters, reduced diameter stems projecting from the opposing end portions of the pistons respectively, a flange formed around the outer periphery of each of the stems, and a split sleeve consisting of two or more co-operating elements and having stepped portions in the inner circumference thereof at the opposite ends respectively, the split sleeve being restrained in a cylindrical shape with the stepped portions engaging with respective flanges thereby connecting the two pistons with each other.Type: GrantFiled: February 17, 1976Date of Patent: February 21, 1978Assignee: Tokico Ltd.Inventors: Yoshihiro Hayashida, Tetsuo Haraikawa
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Patent number: 4072214Abstract: A disc brake has a bracket adapted to be secured to a non-rotatable part of a vehicle and straddling a rotatable disc for supporting a pair of friction pads in slidable relationship with the disc to receive braking torque, a housing disposed on one side of the disc and slidably supported for movement in the axial direction, a piston working in a cylinder formed in the housing and urging one of the friction pads against one surface of the disc, and a plate-like yoke straddling the disc and connecting the housing with the other friction pad. The plate-like yoke is secured to the housing with an interference fit at least in the circumferential direction of the disc.Type: GrantFiled: October 21, 1976Date of Patent: February 7, 1978Assignee: Tokico Ltd.Inventors: Tetsuo Haraikawa, Yasuo Karasudani
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Patent number: 4072216Abstract: A disc brake of a floating caliper type, in which a pair of slide bolts are provided along the circumference of a disc in spaced relation from each other, and a pair of wall portions are provided so as to cover the sides of the aforesaid slide bolts but in spaced relation from each other along the circumference of the disc.Type: GrantFiled: August 10, 1976Date of Patent: February 7, 1978Assignee: Tokico Ltd.Inventor: Tetsuo Haraikawa
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Patent number: 4068745Abstract: A floating caliper-type disc brake in which friction pads act on separate support arms on the opposite sides of the disc whereby the material and weight of the support are reduced.Type: GrantFiled: August 10, 1976Date of Patent: January 17, 1978Assignee: Tokico Ltd.Inventor: Tetsuo Haraikawa
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Patent number: 4068743Abstract: A disc brake has a stationary supporting member straddling a rotatable disc for supporting a pair of friction pads which slide on the opposite sides of the disc, the supporting member being secured to a non-rotatable part of a vehicle by two circumferentially spaced and axially extending bolts. An abutment surface is formed on the supporting member for engaging with a complementary surface formed on a shoulder portion of the non-rotatable part at a location radially inward with respect to each of the bolts and circumferentially outside the two bolts.Type: GrantFiled: June 11, 1976Date of Patent: January 17, 1978Assignee: Tokico Ltd.Inventors: Yasuo Karasudani, Tetsuo Haraikawa