초록 ▼

A filtering face mask that covers at least the nose and mouth of a wearer and that includes an exhalation valve. The exhalation valve opens in response to increased pressure when the wearer exhales to allow the exhaled air to be rapidly purged from the mask interior. An exhale filter element is plac

A filtering face mask that covers at least the nose and mouth of a wearer and that includes an exhalation valve. The exhalation valve opens in response to increased pressure when the wearer exhales to allow the exhaled air to be rapidly purged from the mask interior. An exhale filter element is placed in one of several locations in the exhale flow stream to remove contaminants from the exhaled air. The face mask is beneficial in that it provides comfort to the wearer by allowing warm, moist, high-CO2-content air to be rapidly evacuated from the mask interior through the valve and also protects the wearer from splash fluids and polluted air while at the same time protecting other persons or things from being exposed to contaminants in the exhale flow stream.

대표청구항 ▼

A filtering face mask that covers at least the nose and mouth of a wearer and that includes an exhalation valve. The exhalation valve opens in response to increased pressure when the wearer exhales to allow the exhaled air to be rapidly purged from the mask interior. An exhale filter element is plac

A filtering face mask that covers at least the nose and mouth of a wearer and that includes an exhalation valve. The exhalation valve opens in response to increased pressure when the wearer exhales to allow the exhaled air to be rapidly purged from the mask interior. An exhale filter element is placed in one of several locations in the exhale flow stream to remove contaminants from the exhaled air. The face mask is beneficial in that it provides comfort to the wearer by allowing warm, moist, high-CO2-content air to be rapidly evacuated from the mask interior through the valve and also protects the wearer from splash fluids and polluted air while at the same time protecting other persons or things from being exposed to contaminants in the exhale flow stream. t al., 074/512 oupled to a bicycle frame and a handlebar and display unit support portion movably coupled to the stem portion. The handlebar and display unit support portion includes a handlebar clamp and first and second mounting flanges. The handlebar clamp has the handlebar fixedly coupled thereto. The first and second mounting flanges are spaced apart to form a display receiving space with the display unit fixedly coupled therebetween. In the preferring embodiments, the handlebar and the display unit are mount to the bicycle handle mounting member such that the wiring between the display unit and control members mounted to the handlebar are completely concealed. strength measuring device for measuring an adhesive strength of a sample by pressing a predetermined point of a guide member provided with a predetermined contact surface to the sample, then peeling the pressed contact surface, and measuring the adhesive strength, said device comprising: a vertically moveable base plate; a load cell connected to said vertically movable base plate to measure adhesive strength; a guide member connected to said vertically movable base plate, wherein the guide member is held by a cassette member which is attachable and detachable with respect to a device body; a moving mechanism connected to said vertically movable base plate, wherein said moving mechanism is adapted to move an unused portion of the contact surface to a position at which said guide member can press an unused portion of the contact surface to the sample to enable each measurement of the adhesive strength. 3. An adhesive strength measuring device for measuring an adhesive strength of a sample by pressing a predetermined point of a guide member provided with a predetermined contact surface to the sample, then peeling the pressed contact surface, and measuring the adhesive strength, said device comprising: a vertically movable base plate; a load cell connected to said vertically movable base plate; a guide member connected to said load cell, wherein said guide member is adapted to press an unused portion of the contact surface to the sample and said load cell is adapted to measure the pressure force of the guide member; a moving mechanism connected to said vertically movable base plate, wherein said moving mechanism is adapted to move an unused portion of the contact surface to a position at which said guide member can press an unused portion of the contact surface to the sample; and a sample holding mechanism for holding the sample, wherein the sample holding mechanism is provided so as to be able to be raised and lowered at the same time as the guide member, and is also provided so as to be able to be raised and lowered relative to the guide member via an urging device for urging in a direction away from the guide member. 4. An adhesive strength measuring device for measuring an adhesive strength of a sample by pressing a predetermined point of a guide member provided with a predetermined contact surface to the sample, then peeling the pressed contact surface, and measuring the adhesive strength, said device comprising: a vertically movable base plate; a load cell connected to said vertically movable base plate; a guide member connected to said load cell, wherein said guide member is adapted to press an unused portion of the contact surface to the sample and said load cell is adapted to measure the pressure force of the guide member, wherein the guide member is held by a cassette member which is attachable and detachable with respect to a device body; and a moving mechanism connected to said vertically movable base plate, wherein said moving mechanism is adapted to move an unused portion of the contact surface to a position at which said guide member can press an unused portion of the contact surface to the sample. etween the output terminal and the first input terminal, and i. switching means for alternating functional connection of one of the ultrasonic transducers with the first input terminal for directing the electrical signals from the signal source to one of the ultrasonic transducers and for directing the received signals from an ultrasonic transducer to the amplifier. 2. Circuit according to claim 1, in which the functionally connected transducer is connected between the first input terminal of the amplifier and a reference potential. 3. Circuit according to claim 1, in which the functionally connected transducer is connected between the first input terminal of the amplifier and the output terminal of the amplifier. 4. Circuit according to claim 1, in which each ultrasonic transducer is connected in series with one of the switching means, and the connected transducers and switches are connected in parallel. 5. Circuit according to claim 1, in which each ultrasonic transducer is connected in parallel with one of the switching means, and the thus-connected transducers and switches are connected in series. 6. Circuit according to claim 1, including use of an ultrasonic frequency between 500 KHz and 2 MHz. 7. Circuit according to claim 1, including a measuring pipe with N of the transducers, N being larger than or equal to 2. g along a direction substantially perpendicular to a longitudinal axis of the screw, a plurality of bit fitting grooves each having an end wall portion extending along a direction substantially parallel to the longitudinal axis of the screw from the head surface of the screw head to a lower edge portion, a bottom portion extending along a direction substantially perpendicular to the longitudinal axis from the lower edge portion of the end wall portion to a raised portion of the screw, an inclined surface portion formed so as to extend along a direction transverse to the longitudinal axis of the screw from the raised portion of the bottom portion to a lower portion of the screw, a substantially conical-shaped bottom surface extending from the lower portion of the inclined surface portion of each of the bit fitting grooves of the screw; and a driver bit having a plurality of blades each shaped to complement and fit into one of the bit fitting grooves of the screw and abut the bottom portion of each of the bit fitting grooves, said plurality of blades having end edge portions each extending along a direction substantially parallel to a longitudinal axis of the driver bit so as to match respective end wall portions of the bit fitting grooves of the screw head, a plurality of tip surfaces each extending from the end edge portions along a direction substantially perpendicular to the longitudinal axis of the driver bit, and a protrusion extending from each of the tip surfaces along a direction substantially parallel to the longitudinal axis of the driver bit. 4. A screw and driver bit apparatus comprising: a screw having a screw head defining a head surface extending along a direction substantially perpendicular to a longitudinal axis of the screw, a plurality of bit fitting grooves each having an end wall portion extending along a direction substantially parallel to the longitudinal axis of the screw from the head surface of the screw head to a lower edge portion, a bottom portion extending along a direction substantially perpendicular to the longitudinal axis from the lower edge portion of the end wall portion to a raised portion of the screw, an inclined surface portion formed so as to extend along a direction transverse to the longitudinal axis of the screw from the raised portion of the bottom portion to a lower portion of the screw, a substantially conical-shaped bottom surface extending from the lower portion of the inclined surface portion of each of the bit fitting grooves of the screw; and a driver bit having a plurality of blades each shaped to complement and fit into one of the bit fitting grooves of the screw and abut the bottom portion of each of the bit fitting grooves, said plurality of blades having end edge portions, wherein the end edge portions of said plurality of blades are each inclined relative to a direction parallel to the longitudinal axis of the driver bit, a plurality of tip surfaces each extending from the end edge portions along a direction substantially perpendicular to the longitudinal axis of the driver bit, and a protrusion extending from each of the tip surfaces along a direction substantially parallel to the longitudinal axis of the driver bit. 5. The apparatus according to claim 3, wherein the protrusion is shaped so as to complement and fit against the inclined surface portions and the conical-shaped bottom surface of the screw. 6. A screw and header punch screw manufacturing apparatus comprising: a screw having a screw head defining a head surface extending along a direction substantially perpendicular to a longitudinal axis of the screw, a plurality of bit fitting grooves each having an end wall portion extending along a direction substantially parallel to the longitudinal axis of the screw from the head surface of the screw head to a lower edge portion, a bottom portion extending along a direction substantially perpendicular to the longitudinal axis fro m the lower edge portion of the end wall portion to a raised portion of the screw, an inclined surface portion formed so as to extend along a direction transverse to the longitudinal axis of the screw from the raised portion of the bottom portion to a lower portion of the screw, and a substantially conical-shaped bottom surface extending from the lower portion of the inclined surface portion of each of the bit fitting grooves of the screw; and a header punch including protrusions having protruding portions shaped to punch out and form the end wall portions and the bottom portions of each of the bit fitting grooves of the screw, and protruding surfaces shaped to form said inclined surface portions extending along a direction transverse to a longitudinal axis of the header punch from said protruding edge portions. 7. The apparatus according to claim 6, wherein each of the bit fitting grooves are configured to receive perpendicular blades of a driver bit, and the bit fitting grooves include first and second inclined side wall portions that form a gradually enlarged width of each of the bit fitting grooves relative to a radial direction substantially parallel to the head surface of the screw head, and side walls of the protrusions of the header punch are shaped to fit within the first and second side wall portions of the bit fitting grooves of the screw. 8. A screw and driver bit apparatus comprising: a screw having a screw head defining a head surface extending along a direction substantially perpendicular to a longitudinal axis of the screw, a plurality of bit receiving grooves each having an end wall portion extending along a direction substantially parallel to the longitudinal axis of the screw from the head surface of the screw head to a lower edge portion, a bottom portion extending along a direction substantially perpendicular to the longitudinal axis from the lower edge portion of the end wall portion to a raised portion of the screw, an inclined surface portion formed so as to extend along a direction transverse to the longitudinal axis of the screw from the raised portion of the bottom portion to a lower portion of the screw, a substantially conical-shaped bottom surface extending from the lower portion of the inclined surface portion of each of the bit fitting grooves of the screw; wherein each of the bit fitting grooves are shaped to receive and enclose respective portions of two perpendicular blades of a driver bit, and the bit fitting grooves include first and second side wall portions wherein a distance between the first and second side wall portions gradually increases along a radial direction substantially parallel to the head surface of the screw head; and the driver bit including a blade having end edge portions each extending along a direction substantially parallel to a central axis of the driver bit so as to match respective end wall portions of the bit fitting grooves of the screw head, tip surfaces each extending from the end edge portions along a direction substantially perpendicular to the central axis of the driver bit, and a protrusion extending from each of the tip surfaces along a direction substantially parallel to the central axis of the driver bit. 9. The apparatus according to claim 8, wherein each blade includes first and second tapered side walls shaped to complement and fit into the gradually enlarged width of each of the bit fitting grooves. 10. The apparatus according to claim 8, wherein the protrusion is shaped to complement and fit against the inclined surface portions and the conical-shaped bottom surface of the screw. 11. A screw and driver bit apparatus comprising: a screw having a screw head defining a head surface extending along a direction substantially perpendicular to a longitudinal axis of the screw, a plurality of bit receiving grooves each having an end wall portion extending along a direction substantially parallel to the longitudinal axis of the screw from the head surface of the screw head to a lower edge portion, a bottom portion extending along a direction substantially perpendicular to the longitudinal axis from the lower edge portion of the end wall portion to a raised portion of the screw, an inclined surface portion formed so as to extend along a direction transverse to the longitudinal axis of the screw from the raised portion of the bottom portion to a lower portion of the screw, a substantially conical-shaped bottom surface extending from the lower portion of the inclined surface portion of each of the bit fitting grooves of the screw; wherein each of the bit fitting grooves are shaped to receive and enclose respective portions of two perpendicular blades of a driver bit, and the bit fitting grooves include first and second side wall portions wherein a distance between the first and second side wall portions gradually increases along a radial direction substantially parallel to the head surface of the screw head; and the driver bit including a blade having end edge portions, wherein the end edge portions are inclined relative to a direction parallel to the central axis of the driver bit, tip surfaces each extending from the end edge portions along a direction substantially perpendicular to the central axis of the driver bit, and a protrusion extending from each of the tip surfaces along a direction substantially parallel to the central axis of the driver bit.