Abstract: A caster of an endless structure is provided which is almost jam-proof even in the case of a bigger gap. The caster includes a first wheel supported on a mounting leg, a second wheel supported by an axle on one end of a suspension arm of which the other end is supported by an axle which also supports the first wheel, and a wrap-around member which is wrapped around the first and second wheels. The wraparound member is formed an endless belt form by connecting independent pieces to each other. The outer peripheral section of each piece is provided with a wider section and when the wraparound member is depressed and warps, the wider section is adapted to touch a wider section of the adjacent piece, thereby preventing further depression.

Abstract: A caster of an endless structure is provided which is almost jam-proof even in the case of a bigger gap. The caster includes a first wheel supported on a mounting leg, a second wheel supported by an axle on one end of a suspension arm of which the other end is supported by an axle which also supports the first wheel, and a wrap-around member which is wrapped around the first and second wheels. The wraparound member is formed an endless belt form by connecting independent pieces to each other. The outer peripheral section of each piece is provided with a wider section and when the wraparound member is depressed and warps, the wider section is adapted to touch a wider section of the adjacent piece, thereby preventing further depression.

Abstract: A conventional endless belt is made of a comparatively flexible member such as rubber. When the endless belt comes in contact with a gap, part of the belt is pushed inward against the gap to be depressed and as a result, a greater power is needed for the endless belt to climb over the gap and it becomes easily jamed. According to the present invention, a caster of an endless structure is provided which is almost jam-proof even in the case of a bigger gap. The caster comprises a first wheel 3 supported on a mounting leg 2, a second wheel 4 supported by an axle 8 on one end of a suspension arm 7 of which the other end is supported by an axle 6 which also supports the first wheel 3, and a wrap-around member 5 which is wrapped around the first and second wheels 3 and 4. The wraparound member 5 is formed an endless belt form by connecting independent pieces 25 to each other.

Abstract: The present invention offers an optical disk determination circuit that can improve the stability of the operation to detect the peak (pulse signal) of the received light signal, and that can improve the stability of the optical disk determination operation. When determining the type of optical disk corresponding to the depth from the surface of the plane on which a light beam is irradiated to the data recording layer, light is irradiated while varying the focal position of the light beam at a constant velocity in one direction of the depth direction from the surface of the optical disk. The bottom level of the received light signal corresponding to the intensity of this reflected light is clamped at a specified level by the bottom clamp circuit 43. The received light signal with the bottom level clamped is compared with a specified reference voltage Vref by the comparator 45, and the received light signal peak (pulse signal) is detected corresponding to the results of this comparison.

Abstract: An amplitude variation detection circuit that can reliably detect the mirror portion independently of the type of optical recording medium, as well as a type of information regenerating apparatus that contains said amplitude variation detecting circuit. Voltage division of top envelope signal Ste and bottom-hold signal Sbh of RF signal Srf is performed by voltage divider (16); then, after amplification by gain control amplifier (19) with a gain that corresponds to the type of optical disc (1), a prescribed offset is added by offset circuit (22) to the signal, and the resulting signal is input as mirror detection threshold signal Smt to comparator (24). The high-frequency noise component of bottom envelope signal Sbe of RF signal Srf is removed by low-pass filter (21); after amplification by gain control amplifier (20) with a gain that corresponds to the type of optical disc (1), the signal is input to comparator (24).

Abstract: A reflector 3 having a bottom section 4 and a slope section 13 surrounding the periphery of the bottom section 4 is provided, and an LED 5 is mounted on the center of the bottom section 4. A holder section 9 of a light control means 7 is detachably mounted to cover a lens 6 of the LED 5, while a circular plate section 18 of the light control means 7 is provided with a main reflecting section 11 and a reflecting transmission section 12. The main reflecting section 11 is designed to reduce the transmission amount from the LED 5, thereby causing most of the light to reflect on the reflector 3 side. On the other hand, the reflecting transmission section 12 permits a larger amount of transmission than in the main reflecting section 11.

Abstract: The present invention provides a ferrite-based spheroidal graphite cast iron containing the following elements in the following contents in % by weight: C: 3.1 to 4.0%; Si: 3.6 to 4.6%; Mo: 0.3 to 1.0%; V: 0.1 to 1.0%; Mn: 0.15 to 1.6%; and Mg: 0.02 to 0.10%, and the total content of V and Mn is 0.3 to 2.0 wt %, and an exhaust system component using the spheroidal graphite cast iron. Thus, the ferrite-based spheroidal graphite cast iron having higher heat resistance than that of a conventional high Si spheroidal graphite cast iron that can be produced inexpensively by a simple method.

Abstract: The present invention provides a polyurethane exhibiting a superior adhesive property, bonding property, weather resistance, water resistance, and the like, and comprising in a molecule: an acidic group which is neutralized by a basic compound; and a structural unit represented by general formula (I): (in the formula, R1 and R2 are identical or different, and represent a lower alkyl group).

Abstract: An amplitude variation detection circuit that can reliably detect the mirror portion independently of the type of optical recording medium, as well as a type of information regenerating apparatus that contains said amplitude variation detecting circuit. Voltage division of top envelope signal Ste and bottom-hold signal Sbh of RF signal Srf is performed by voltage divider (16); then, after amplification by gain control amplifier (19) with a gain that corresponds to the type of optical disc (1), a prescribed offset is added by offset circuit (22) to the signal, and the resulting signal is input as mirror detection threshold signal Smt to comparator (24). The high-frequency noise component of bottom envelope signal Sbe of RF signal Srf is removed by low-pass filter (21); after amplification by gain control amplifier (20) with a gain that corresponds to the type of optical disc (1), the signal is input to comparator (24).

Abstract: The present invention provides a polyurethane exhibiting a superior adhesive property, bonding property, weather resistance, water resistance, and the like, and comprising in a molecule: an acidic group which is neutralized by a basic compound; and a structural unit represented by general formula 1

Abstract: The present invention provides a cylinder block which can reduce the vibrations and noises produced from the engine at high temperatures and has a light weight, as well as a method of making such a cylinder block. Specifically, the cylinder block of the present invention comprises a main body (5, 21) of the cylinder block, a bearing (11, 17) attached to the underside of the main body (5, 21), and a crankshaft supported rotatably in a bearing section (13, 25) formed by the underside of the main body (5, 21) and the bearing (11, 17). In this cylinder block, an aluminum alloy layer (33) is formed in the sliding portion of the bearing section (13, 25), the region adjacent to the aluminum alloy layer (33) consists of a composite material (35), and the coefficient of thermal expansion of the composite material (35) is lower than that of the aluminum alloy layer (33) formed in the sliding portion.

Abstract: A peak detector for detecting a peak signal includes an input circuit for inputting an input signal, a differential comparator for comparing the input signal with the peak signal to generate a difference signal, a diverting circuit to divert current between a first current path and a second current path based on the difference signal, and a comparator to accept current from the first current path and not from the second current path and to form the peak signal resulting from the current.

Abstract: A method for the hardening treatment of a sintered alloy includes compressing an iron-based sinterable material to form a compact, providing a surface of the compact with a coating material containing aluminum or an aluminum alloy that melts at a temperature lower than the sintering temperature of the compact, and sintering the compact provided with the coating material, so as to form an intermediate compound of iron and aluminum in a surface layer of the compact.

Abstract: The present invention provides a process for the hardening treatment of sintered members which can impart sufficient wear resistance thereto at low cost without causing a reduction in dimensional accuracy due to heat distortion. This process for the hardening treatment of sintered members comprises the steps of coating an iron-based sinterable member with a Ni—P alloy powder containing 7 to 13% by weight of phosphorus so as to give a coating weight of 0.1 to 1.2 mg/mm2; sintering the iron-based sinterable member coated with the Ni—P alloy powder at a temperature in the range of 1,000 to 1,300° C.; and hardening the iron-based sintered member by cooling it at a cooling rate of not less than 10° C./min. until a temperature of 200° C. is reached.

Abstract: The present invention offers an optical disk determination circuit that can improve the stability of the operation to detect the peak (pulse signal) of the received light signal, and that can improve the stability of the optical disk determination operation. When determining the type of optical disk corresponding to the depth from the surface of the plane on which a light beam is irradiated to the data recording layer, light is irradiated while varying the focal position of the light beam at a constant velocity in one direction of the depth direction from the surface of the optical disk. The bottom level of the received light signal corresponding to the intensity of this reflected light is clamped at a specified level by the bottom clamp circuit 43. The received light signal with the bottom level clamped is compared with a specified reference voltage Vref by the comparator 45, and the received light signal peak (pulse signal) is detected corresponding to the results of this comparison.

Abstract: A peak detector for detecting a peak signal includes an input circuit for inputting an input signal, a differential comparator for comparing the input signal with the peak signal to generate a difference signal, a diverting circuit to divert current between a first current path and a second current path based on the difference signal, and a comparator to accept current from the first current path and not from the second current path and to form the peak signal resulting from the current.

Abstract: The present invention provides a cylinder block which can reduce the vibrations and noises produced from the engine at high temperatures and has a light weight, as well as a method of making such a cylinder block. Specifically, the cylinder block of the present invention comprises a main body (5, 21) of the cylinder block, a bearing (11, 17) attached to the underside of the main body (5, 21), and a crankshaft supported rotatably in a bearing section (13, 25) formed by the underside of the main body (5, 21) and the bearing (11, 17). In this cylinder block, an aluminum alloy layer (33) is formed in the sliding portion of the bearing section (13, 25), the region adjacent to the aluminum alloy layer (33) consists of a composite material (35), and the coefficient of thermal expansion of the composite material (35) is lower than that of the aluminum alloy layer (33) formed in the sliding portion.

Abstract: The present invention provides sintered alloys in which only a sliding part can be hardened without altering the dimensional accuracy of the article, and a method for the hardening treatment thereof. Specifically, the present invention relates to a method for the hardening treatment of a sintered alloy which comprises the steps of compressing an iron-based sinterable material to form a compact 2; placing a small-sized member 1 containing aluminum or an aluminum alloy that melts at a temperature lower than the sintering temperature of the compact, on a surface of the compact; and sintering the compact 2 so as to form an intermetallic compound 20 of iron and aluminum in a surface layer 7 of the compact 2, and to a sintered alloy having been treated according to this method.

Abstract: The present invention provides a resin composition containing a polyester resin processing, within its molecular structure, a structural unit represented by the following formula (I), and an amino resin: ##STR1## [wherein, R.sup.1 and R.sup.2 are the same or different and each represents a hydrogen atom or lower alkyl, with the proviso that R.sup.1 and R.sup.2 do not simultaneously represent hydrogen atoms]. In addition, the present invention provides a cured resin obtained by means of hardening said resin composition, and a paint containing said resin composition. The aforementioned resin composition provides a cured material that exhibits excellent resistance to hydrolysis, resistance to alkali, and resistance to cissing, and thus is suitable for a paint and the like.

Abstract: The present invention discloses a fully integrated data synchronization circuit for a disk drive read channel system. The data synchronization system comprises dual data synchronizers to provide read reference clocks. Dual PLL circuits are coupled to the data synchronizers to provide a stable reference frequency to data synchronizers. One of the two data synchronizers is used to obtain leading edge data, while the other is for trailing edge data. Each PLL circuit comprises a phase detector, a charge pump, and a VCO. A loop filter is used in conjunction with a charge pump to control loop characteristics of the PLLs. In an idle mode, one of the PLLs is used as a time base generator to provide a stable reference frequency to data synchronizers. Once data synchronizers achieve lock using the stable reference frequency and switch over to read data, the time base generator PLL is switched over to function as a data synchronizer PLL in a read mode.