Abstract: A studless tire capable of suppressing a vehicle from staggering at the time of braking on icy and snow-covered roads, including a tread portion 2 provided with at least six block rows R1 to R4, wherein each block B is provided with sipes having a depth of at least 3.0 mm, and the block rows comprises at least two crown block rows CR disposed in a crown region Ac extending from the tire equator C as its center to have a width of 50% of the tread width TW, and at least two shoulder block rows Sh disposed on each axially outer side of the crown block rows CR, and wherein lateral grooves 4 provided in a block row are inclined in the opposite direction, with respect to the axial direction, to lateral grooves provided in an axially adjacent block row.

Abstract: The present invention measures the frequency of occurrence of behaviors of a particular behavior for each time within a predetermined driving unit for each type of driving behaviors and causes the measured frequency of occurrence on a display unit as a driving evaluation index aimed at attaining a zero number each time the particular behavior takes place. Also, for each type of the driving behaviors, based on the frequency of occurrence of the particular behavior, which is a proportion of the number of occurrence of the particular behavior for each type relative to a predetermined driving time, which is the predetermined driving unit, the mean time between incidents of the particular behavior is calculated and the calculated mean time between the incidents is used as the driving evaluation index.

Abstract: A pneumatic tire comprises: an axially inner circumferential row of crown blocks disposed on each side of the tire equator; and an axially outermost circumferential row of shoulder blocks disposed axially outside thereof. The crown blocks are circumferentially divided by alternate first and second crown axial grooves. The shoulder blocks are circumferentially divided by alternate first and second shoulder axial grooves. The first shoulder axial groove has a groove width of not less than 3.5 mm. The first crown axial groove has a groove width of not less than 2.0 mm. The second shoulder axial groove comprises an axially innermost sipe-like part having a groove width of 0.5 to 2.0 mm, and an axially outer main part having a groove width of not less than 3.5 mm. The second crown axial groove comprises an axially innermost sipe-like part having a groove width of 0.5 to 2.0 mm, and an axially outer main part having a groove width of not less than 2.0 mm.

Abstract: A pneumatic tire capable of preventing wandering without impairing wear resistance, including tread portion 2 having circumferential shoulder grooves 6c extending at locations near ground contact edges E and lateral shoulder grooves 7d extending between circumferential groove 6c and ground contact edge E, and having square shoulders such that tread surface 2a and buttress face 14 extending radially inwardly and axially outwardly from ground contact edge E intersects to form an edge or corner, wherein each shoulder block B4 is provided with circumferential sipe 11 in a region apart axially inwardly from ground contact edge E by a distance of 2 mm or more and a distance of 10 mm or less, the buttress face 14 is provided with recess 15 extending circumferentially in at least a part of projection region Z obtained by projecting circumferential sipe 11 onto buttress face 14, and radially innermost end 15B of recess 15 is located at a radial position corresponding to a region ranging from 50 to 100% of the depth of

Abstract: A pneumatic tire whose steering stability on dry roads is improved with minimizing lowering of on-snow performances and which has round shoulders and comprises tread portion 2 divided by circumferential main grooves 3 and lateral grooves 4 into blocks 5 provided with sipes 6 each having zigzag part 8, the circumferential grooves 3 including at least a pair of axially outermost circumferential grooves 3o to divide the tread portion 2 into shoulder regions Ysh and crown region Ycr, wherein the zigzag part 8 of sipes 6sh disposed in the shoulder regions Ysh has a larger zigzag amplitude Wsh and a larger zigzag pitch Psh than zigzag amplitude Wcr and zigzag pitch Pcr of the zigzag part 8 of sipes 6cr disposed in the crown region Ycr, and angle ?sh of the sipes 6sh with respect to the axial direction is smaller than angle ?cr of the sipes 6cr with respect to the axial direction.

Abstract: A pneumatic tire comprises a tread portion provided with sipes, the sipes each having a zigzag configuration at any depth from the top of the sipe to a certain depth, and the zigzag configuration having vertexes Q1 on one side of the zigzag and vertexes Q2 on the other side of the zigzag, wherein as the depth increases from the top of the sipe to said certain depth, the vertexes Q1 shift in the longitudinal direction of the sipe and the direction of the shift is turned at least once such that the vertexes Q1 first shift towards one direction then towards the other direction, thereby describing a zigzag line extending from the top of the sipe to said certain depth and having at least one tuning point, but the vertexes Q2 describe lines which are linear or less zigzag when compared with the zigzag lines described by the vertexes Q1.

Abstract: A pneumatic tire capable of preventing wandering without impairing wear resistance, including tread portion 2 having circumferential shoulder grooves 6c extending at locations near ground contact edges E and lateral shoulder grooves 7d extending between circumferential groove 6c and ground contact edge E, and having square shoulders such that tread surface 2a and buttress face 14 extending radially inwardly and axially outwardly from ground contact edge E intersects to form an edge or corner, wherein each shoulder block B4 is provided with circumferential sipe 11 in a region apart axially inwardly from ground contact edge E by a distance of 2 mm or more and a distance of 10 mm or less, the buttress face 14 is provided with recess 15 extending circumferentially in at least a part of projection region Z obtained by projecting circumferential sipe 11 onto buttress face 14, and radially innermost end 15B of recess 15 is located at a radial position corresponding to a region ranging from 50 to 100% of the depth of

Abstract: A studless tire capable of suppressing a vehicle from staggering at the time of braking on icy and snow-covered roads, including a tread portion 2 provided with at least six block rows R1 to R4, wherein each block B is provided with sipes having a depth of at least 3.0 mm, and the block rows comprises at least two crown block rows CR disposed in a crown region Ac extending from the tire equator C as its center to have a width of 50% of the tread width TW, and at least two shoulder block rows Sh disposed on each axially outer side of the crown block rows CR, and wherein lateral grooves 4 provided in a block row are inclined in the opposite direction, with respect to the axial direction, to lateral grooves provided in an axially adjacent block row.

Abstract: A pneumatic tire comprises a tread portion provided with sipes, the sipes each having a zigzag configuration at any depth from the top of the sipe to a certain depth, and the zigzag configuration having vertexes Q1 on one side of the zigzag and vertexes Q2 on the other side of the zigzag, wherein as the depth increases from the top of the sipe to said certain depth, the vertexes Q1 shift in the longitudinal direction of the sipe and the direction of the shift is turned at least once such that the vertexes Q1 first shift towards one direction then towards the other direction, thereby describing a zigzag line extending from the top of the sipe to said certain depth and having at least one tuning point, but the vertexes Q2 describe lines which are linear or less zigzag when compared with the zigzag lines described by the vertexes Q1.

Abstract: A tread portion (4) of a tire includes a first vertical groove (10), a second vertical groove (12), a subvertical groove (14), a first lateral groove (16), a second lateral groove (18) and a third lateral groove (20) on a surface thereof. The tread portion (4) further includes a first block (24), a second block (26), a third block (28) and a fourth block (30). Each of the blocks (24), (26), (28) and (30) has a siping (S). The siping (S) takes a zigzag shape. Each of the blocks (24), (26), (28) and (30) has a large number of small grooves (G). The shape of the small groove (G) constitutes a part of a wavy curve extended in an axial direction. The small groove (G) has a width which is equal to or greater than 0.1 mm and is equal to or smaller than 2.0 mm and a depth which is equal to or greater than 0.1 mm and is equal to or smaller than 1.0 mm. The small groove (G) has a pitch which is equal to or greater than 0.5 mm and is equal to or smaller than 5.0 mm.

Abstract: The present invention relates to an apparatus for measuring the intracranial pressure of a living body or patient utilizing ultrasonic waves. An ultrasonic pulse is transmitted as triggered by a trigger signal into the cranium from an ultrasonic probe placed outside the cranium of the living body, the data of an interference reflection wave caused by the multiple reflections of the incident waves at the interstital boundaries within the cranium is analyzed for frequency, and the time difference between the element waves of the interference reflection wave is calculated and delivered as output. Thus, the dura mater thickness and its change are measured, and the intracranial pressure and its change can be measured utilizing the correlation between the intracranial pressure and dura mater thickness.

Abstract: An apparatus for recording the intracranial pressure of a living body or patient utilizing ultrasonic waves includes a probe which is connected to a pulser to receive intracranial echoes that are multi-reflected being interfered with each other, a receiver for amplifying the received echoes, a gate circuit which applies a gate for a predetermined time duration of echo synchronous with the heart beat among the amplified echoes and which produces internal waves of gates, and a recorder for continuously recording peak values of the output waveforms. The intracranial pressure waveforms are continuously recorded, a change in thickness of the dura mater is found from the recorded intracranial pressure waveforms and a change of the intracranial pressure is found by utilizing a correlation between the intracranial pressure and the thickness of the dura mater.