Pressure gauge with zone scale

Abstract

A pressure gauge with a zoned scale is used to measure the air pressure of an inflatable device, and includes a shell mechanism, and a first air pressure sensing mechanism, a second air pressure sensing mechanism, and a display mechanism installed on the shell mechanism. The first air pressure sensing mechanism and the second air pressure sensing mechanism can move when subjected to air pressure. The display mechanism includes a scale plate and an indication guide unit. The indication guide unit engages with the first air pressure sensing mechanism and can switch between a first sensing interval and a second sensing interval. The scale plate has a first scale area and a second scale area. When the indication guide unit is engaged and located in the first sensing interval, the indication guide unit points to the first scale area. When the indication guide unit is engaged and located in the second sensing interval, the indication guide unit points to the second scale area. By utilizing the design that the indication guide unit can engage with the first air pressure sensing mechanism and the second air pressure sensing mechanism respectively, it can point to different scale areas when sensing different pressure ranges.

Description

Technical Field

[0001] The present invention relates to a pressure gauge, in particular to a pressure gauge with partitioned scales suitable for being arranged on an air pumping device. Background Art

[0002] Currently, a conventional pressure gauge suitable for being installed on an air pump is used to measure the air pressure of an air channel of the air pump. The air channel is in gas communication with an inflatable object and has the same air pressure.

[0003] The pressure gauge comprises a hollow housing, an air pressure sensing unit located within the hollow housing, an indicator, and an indicator surface. The air pressure sensing unit comprises a movable member that is movably inserted into the hollow housing, and a spring that abuts against the movable member. The indicator engages with the movable member and is driven to rotate when the movable member moves. The indicator surface has a plurality of equiangularly spaced graduations.

[0004] When the pump inflates the object, the air pressure sensing unit is elastically displaced by the thrust of the gas, causing the indicator to rotate. Because the indicator's rotation angle is proportional to the spring's deformation, the indicator in current pressure gauges is driven solely by the air pressure sensing unit, limiting the range of pressures it can sense.

[0005] Furthermore, current pressure gauges have the same deflection angle for any pressure change within a range of values. However, for the inflated object, accurate pressure readings are more important at low initial inflation pressures or near a predetermined pressure suitable for the intended use (e.g., tire use). High pressures closer to saturation are less frequently used, so only an approximate reading is sufficient.

[0006] Therefore, Taiwan Patent No. TWI638982B discloses a pressure gauge. The pressure gauge mainly includes a sensing device, a base with a surface, and a pointer. The sensing device includes an elastic pressure sensor and a sliding member. The elastic pressure sensor includes a first elastic part and a second elastic part. The first elastic part and the second elastic part are connected in series and are compression springs. The first spring constant of the first elastic part is different from the second spring constant of the second elastic part. When the user inflates the air, the high-pressure gas squeezes the sliding member and compresses the entire elastic pressure sensor, so that the elastic pressure sensor uses elastic force to push and control the moving distance of the sliding member, thereby causing the pointer to rotate synchronously for the user to read the pressure value of the surface.

[0007] Although this type of pressure gauge can measure pressure values ​​per unit angle differently in the high and low pressure scale zones, because the first and second elastic portions are connected in series, the sliding member's travel distance and the amount of pointer deflection are constrained by the combined elastic force of the first and second elastic portions. This makes it difficult to estimate the pointer's deflection angle based on the overall elastic deformation. This makes it difficult to calculate the angle between adjacent scales when manufacturing the pressure gauge, making it extremely difficult to produce a pressure gauge with a precise scale.

[0008] Therefore, for those familiar with the technical field, there is still room for improvement in the current structure of the pressure gauge. Summary of the Invention

[0009] An object of the present invention is to provide a pressure gauge with a zoned scale that overcomes at least one disadvantage of the prior art.

[0010] Therefore, the pressure gauge with a zoned scale of the present invention is suitable for measuring the air pressure of an air passage of an inflatable device, and includes a housing mechanism, a first air pressure sensing mechanism, a second air pressure sensing mechanism, and a display mechanism.

[0011] The housing structure is adapted to communicate with the air passage of the inflation device.

[0012] The first air pressure sensing mechanism is mounted on the housing mechanism and is adapted to move when subjected to the air pressure.

[0013] The display mechanism is mounted on the housing mechanism and includes a scale plate and an indicator guide unit. The indicator guide unit can engage with the first air pressure sensing mechanism and can switch between a first sensing range and a second sensing range. The scale plate has a first scale area representing a first pressure range and a second scale area representing a second pressure range not less than the first pressure range. When the indicator guide unit is engaged and located in the first sensing range, the indicator guide unit points to the first scale area. When the indicator guide unit is engaged and located in the second sensing range, the indicator guide unit points to the second scale area.

[0014] The pressure gauge with partitioned scale described in the present invention comprises a housing mechanism including a first housing and a second housing, the first housing being in gas communication with the inflatable device and having a first space extending along an axial direction, the second housing being in gas communication with the inflatable device and having a second space extending along the axial direction, the first air pressure sensing mechanism comprising a first elastic member and a first rack unit, the first elastic member being arranged in the first space of the first housing, the first rack unit having a first tooth base and a first rack portion, the first rack portion being exposed to the first housing of the housing mechanism, the first elastic member having a first fixed end portion that does not move relative to the first housing, and a stop portion. The first movable end portion of the first rack unit is pressed against the first movable end portion of the first rack unit, and the first rack unit can be elastically displaced when subjected to the air pressure. The second air pressure sensing mechanism also includes a second elastic member and a second rack unit. The second elastic member is arranged in the second space of the second shell. The second rack unit has a second tooth base and a second rack portion. The second rack portion is exposed to the second shell of the shell mechanism. The second elastic member has a second fixed end portion that does not move relative to the second shell, and a second movable end portion pressed against the second rack unit. The second rack unit can be elastically displaced when subjected to the air pressure, and the elastic coefficient of the second elastic member is greater than the elastic coefficient of the first elastic member.

[0015] In the pressure gauge with partitioned scales described in the present invention, the first rack unit and the second rack unit move in the same direction during elastic displacement.

[0016] In the pressure gauge with partitioned scales described in the present invention, the first rack unit and the second rack unit move in opposite directions during elastic displacement.

[0017] The pressure gauge with partitioned scale described in the present invention, the first shell is further formed with a first slot and a first vent, the first slot radially penetrates the first shell and extends along the axial direction, the first vent axially penetrates and communicates with the first space and is suitable for gas communication with the inflatable device, the first tooth base is located in the first space and is connected to the first movable end of the first elastic member, the first rack portion is connected to the first tooth base and exposed from the first slot, the first rack portion has a first tooth surface for engaging with the indicating guide unit, the second shell is further formed with a second slot and a second vent, the second slot radially penetrates the The second shell extends along the axial direction, the second vent penetrates axially and communicates with the second space and is suitable for gas communication with the inflation device, the second rack unit has a second tooth base and a second rack portion, the second tooth base is located in the second space and is connected to the second movable end of the second elastic member, the second rack portion is connected to the second tooth base and exposed from the second slot, the second rack portion has a second tooth surface for engaging with the indicating guide unit, the indicating guide unit is rotated by the first tooth surface when in the first sensing interval, and the indicating guide unit is rotated by the second tooth surface when in the second sensing interval.

[0018] The pressure gauge with partitioned scale described in the present invention, the first air pressure sensing mechanism also includes a first end plug, which is fixed to the first shell and connected to the first fixed end of the first elastic member, and the second air pressure sensing mechanism also includes a second end plug, which is fixed to the second shell and connected to the second fixed end of the second elastic member.

[0019] The pressure gauge with zoned scales described in the present invention has an indicating guide unit comprising at least one guide rod and a pointer. The at least one guide rod is engaged with the first air pressure sensing mechanism, and the pointer is connected to the at least one guide rod at one end. When the at least one guide rod is driven by the first air pressure sensing mechanism, the pointer points to the first scale zone. When the at least one guide rod is driven by the second air pressure sensing mechanism, the pointer points to the second scale zone.

[0020] The pressure gauge with zoned scales described in the present invention has an indicating guide unit comprising a first guide rod that can be driven to rotate when engaged with the first air pressure sensing mechanism, a second guide rod that is engaged with the first guide rod and can be driven to rotate when engaged with the second air pressure sensing mechanism, and a pointer connected to one of the first guide rod and the second guide rod at one end. When the first guide rod is driven by the first rack unit, the pointer points to the first scale zone, and when the second guide rod is driven by the second rack unit, the pointer points to the second scale zone.

[0021] The pressure gauge with zoned scales described in the present invention has a first scale zone having a plurality of first scales arranged at a first angle interval in an arc direction, a second scale zone being arcuately connected to the first scale zone and having a plurality of second scales arranged at a second angle interval in the arc direction that is smaller than the first angle, and the scale plate surface further having an intermediate scale located at the junction of the first scale zone and the second scale zone, and the indicating guide unit further changing to an intermediate position. In the intermediate position, the indicating guide unit is simultaneously engaged with the first tooth surface and the second tooth surface, and the pointer points to the intermediate scale.

[0022] The pressure gauge with partitioned scale described in the present invention also includes a third air pressure sensing mechanism, which is installed in the housing mechanism. The third air pressure sensing mechanism is suitable for moving when subjected to the air pressure. The scale plate also has a third scale area, which represents a third pressure range that is not less than the second pressure range. The indicator guide unit can be further transformed to a third sensing interval. When in the third sensing interval, the indicator guide unit engages with the third air pressure sensing mechanism and is driven by the third air pressure sensing mechanism to point to the third scale area.

[0023] The beneficial effect of the present invention is that, by utilizing the design that the indicating guide unit can engage with the first air pressure sensing mechanism and the second air pressure sensing mechanism respectively, it can point to different scale areas when sensing different pressure ranges. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features and effects of the present invention will be more clearly seen in the following embodiments with reference to the accompanying drawings, in which:

[0025] Figure 1 is a perspective view showing a first embodiment of a pressure gauge with a zoned scale according to the present invention;

[0026] Figure 2 is a perspective view of the first embodiment from another angle;

[0027] Figure 3 This is a perspective exploded view showing the first embodiment:

[0028] Figure 4 is a cross-sectional view showing the first embodiment;

[0029] Figure 5 is a side view showing the first embodiment;

[0030] Figure 6 is a top view showing the first embodiment;

[0031] Figure 7 It is along Figure 5 A cross-sectional view taken along line VII-VII in FIG.

[0032] Figure 8 It is along Figure 5 A cross-sectional view taken along line VIII-VIII in FIG.

[0033] Figure 9 is an exploded perspective view illustrating a second embodiment of a pressure gauge with a zoned scale according to the present invention;

[0034] Figure 10 is a bottom view showing the second embodiment;

[0035] Figure 11 is a side view showing the second embodiment;

[0036] Figure 12 It is along Figure 11 A cross-sectional view taken along line XII-XII in FIG. 1 illustrates that the second embodiment is located in the first sensing interval;

[0037] Figure 13 is similar Figure 12 , showing that in the second sensing interval, the guide rod is engaged with the second tooth surface and is not engaged with the first tooth surface;

[0038] Figure 14 is an exploded perspective view showing a third embodiment of a pressure gauge with a zoned scale according to the present invention;

[0039] Figure 15 a bottom perspective view showing the third embodiment;

[0040] Figure 16 is a side view showing the third embodiment;

[0041] Figure 17 It is along Figure 16 A cross-sectional view taken along line XVII-XVII in FIG. 1 illustrates that the third embodiment is located in the first sensing interval;

[0042] Figure 18 is similar Figure 17 , showing that in the second sensing interval, the second guide rod is engaged with the second tooth surface, and the first guide rod is not engaged with the first tooth surface;

[0043] Figure 19 is a perspective view showing a fourth embodiment of a pressure gauge with a zoned scale according to the present invention;

[0044] Figure 20 is a cross-sectional view showing the engagement of the third air pressure sensing mechanism of the fourth embodiment with the guide rod;

[0045] Figure 21is a top view showing that the indicator guide unit of the fourth embodiment is located in the third sensing area; and

[0046] Figure 22 It is a cross-sectional view showing that when the indicating guide unit is located in the third sensing interval, the guide rod is engaged with the third tooth surface. DETAILED DESCRIPTION

[0047] Before the present invention is described in detail, it should be noted that similar components are denoted by the same reference numerals in the following description.

[0048] See Figures 1 to 3 The first embodiment of the pressure gauge with a zoned scale of the present invention is suitable for measuring the air pressure in the airway of an inflation device (not shown). The inflation device is suitable for inflating an inflatable object (not shown). The pressure gauge includes a housing 1, a first air pressure sensing mechanism 2, a second air pressure sensing mechanism 3, and a display mechanism 4.

[0049] See Figures 3 to 5 The housing structure 1 includes a gas communication pipe 11 , a first housing 12 , and a second housing 13 .

[0050] The first shell 12 is generally in the shape of a circular tube extending leftward and rightward along an axial direction L, and defines a first vent 121, a first space 122, and a first slot 123. The first vent 121 is located on the left side of the first shell 12 and penetrates the first shell 12 along the axial direction L. The first space 122 extends leftward and rightward along the axial direction L and is in gas communication with the first vent 121. The first slot 123 radially penetrates the first shell 12 and extends along the axial direction L, and is spaced apart from the first vent 121. The length of the first slot 123 is shorter than the length of the first space 122. The first shell 12 and the second shell 13 are arranged in the same direction along the axial direction L and are vertically arranged in an upper and lower direction. In practice, the first shell 12 has a first pipe 124 located on the left side and a first cover 125 screwed to the right side of the first pipe 124. The first pipe 124 defines the first vent 121 and the first slot 123. The first cover 125 and the first tube 124 together define the first space 122 and extend a first elongated portion 126 radially outward of the first slot 123. The first cover 125 further defines a first through hole 127 extending in the axial direction L and opposite to the first elongated portion 126.

[0051] The second shell 13 is integrally connected to the top of the first shell 12 and extends left and right along the axial direction L and is roughly tubular. The second shell 13 defines a second vent 131, a second space 132, and a second slot 133. The second vent 131 is located on the left side of the second shell 13 and penetrates the second shell 13 along the axial direction L. The second space 132 extends left and right along the axial direction L and is in gas communication with the second vent 131. The second slot 133 radially penetrates the second shell 13 and extends along the axial direction L, and is spaced apart from the second vent 131. The length of the second slot 133 is shorter than the length of the second space 132. In practice, the second shell 13 has a second pipe 134 located on the left side and a second cover 135 screwed to the right side of the second pipe 134. The second pipe 134 defines the second vent 131 and the second slot 133. The second cover 135 and the second tube 134 together define the second space 132 and extend a second elongated portion 136 radially outward of the second slot 133. The second cover 135 further defines a second through hole 137 extending in the axial direction L and opposite to the second elongated portion 136.

[0052] The gas connecting tube 11 is in the shape of a circular tube extending vertically up and down, and is suitable for connecting the gas between the airway of the inflation device and the first air vent 121 and the second air vent 131, so that the first air vent 121 and the second air vent 131 are suitable for gas communication with the inflation device.

[0053] See Figures 3 to 6 , the first air pressure sensing mechanism 2 is mounted on the first shell 12 and is adapted to move when subjected to air pressure from the gas connecting pipe 11. The first air pressure sensing mechanism 2 includes a first end plug 21, a first elastic member 22, and a first rack unit 23. The first end plug 21 penetrates the first space 122 along the axial direction L from the first penetration hole 127 and is fixedly screwed on the right side of the first space 122 opposite to the first air vent 121. The first elastic member 22 is disposed in the first space 122 and has a first fixed end 221 located on the right side and a first movable end 222 located on the left side. The first fixed end 221 is abutted against and connected to the first end plug 21. In this embodiment, the first elastic member 22 is a spring.

[0054] The first rack unit 23 is abutted against the first movable end portion 222 of the first elastic member 22 and has a first tooth base 231 and a first rack portion 232. The first tooth base 231 is inserted into the first space 122 and can move along the axial direction L when subjected to force. In practice, the first tooth base 231 has a first movable plug 233 that can be moved and airtightly inserted into the left side of the first space 122, and a first movable tube 234 that is linked to the first movable plug 233. The left side of the first movable tube 234 is inserted into the first movable plug 233, and the right side of the first movable tube 234 is abutted against the first movable end portion 222 of the first elastic member 22. The first rack portion 232 is connected to the first tooth base 231 and is exposed from the first slot 123 to the outside of the first housing 12. The rack portion 232 has a first tooth surface 235 and a first plane 236 connected to the first tooth surface 235. The first tooth surface 235 is used to engage with an indicator guide unit 42. When the first movable plug 233 is subjected to gas pressure from the first vent 121, it moves along the axial direction L, driving the first movable tube 234 to move, thereby compressing the first elastic member 22. Therefore, when the first rack unit 23 of the first air pressure sensing mechanism 2 is subjected to air pressure from the pumping device through the gas connecting pipe 11, it can be elastically displaced to the right.

[0055] See Figures 3 to 5 、 Figure 7 , the second air pressure sensing mechanism 3 is mounted on the second shell 13 and is adapted to move when subjected to the air pressure. The second air pressure sensing mechanism 3 includes a second end plug 31, a second elastic member 32, and a second rack unit 33. The second end plug 31 penetrates the second space 132 along the axial direction L from the second penetration hole 137 and is fixedly screwed on the right side of the second space 132 opposite to the second air vent 131. The elastic coefficient of the second elastic member 32 is greater than the elastic coefficient of the first elastic member 22 and is arranged in the second space 132. The second elastic member 32 has a second fixed end 321 located on the right side and a second movable end 322 located on the left side. The second fixed end 321 is abutted against and connected to the second end plug 31. In this embodiment, the second elastic member 32 is a spring.

[0056] The second rack unit 33 is abutted against the second movable end portion 322 of the second elastic member 32 and has a second tooth base 331 and a second rack portion 332. The second tooth base 331 is located in the second space 132 and can move along the axial direction L when subjected to force. In practice, the second tooth base 331 has a second movable plug 333 that can be movably and airtightly plugged against the left side of the second space 132, and a second movable tube 334 that is linked to the second movable plug 333. The left side of the second movable tube 334 is inserted into the second movable plug 333, and the right side of the second movable tube 334 is abutted against the second movable end portion 322 of the second elastic member 32. The second rack portion 332 is connected to the second tooth base 331 and is exposed from the second slot 133 to the outside of the second housing 13. The rack portion 332 has a second tooth surface 335 and a second flat surface 336 connected to the second tooth surface 335. The second tooth surface 335 is configured to engage with the indicator guide unit 42 and is located to the left of the first tooth surface 235 along the axial direction L, offset from the first tooth surface 235. When the second movable plug 333 is subjected to gas pressure from the second vent 131, it causes the second movable tube 334 to move, thereby compressing the second elastic member 32. Therefore, when the second rack unit 33 is subjected to gas pressure from the pumping device through the gas connecting pipe 11, it can elastically move rightward.

[0057] See Figure 3 、 Figure 5 、 Figure 6 The display mechanism 4 is mounted above the housing mechanism 1 and includes a scale 41 having a scale plate 411 and the indicator guide unit 42. The scale plate 411 has a first scale area 412, a second scale area 413, and an intermediate scale 414. The first scale area 412 represents a first pressure range and has a plurality of first scales 415 arranged at intervals of a first angle θ1 in an arc direction. The second scale area 413 represents a second pressure range that is not less than the first pressure range. The second scale area 413 is connected to the first scale area 412 in an arc direction and has a plurality of second scales 416 arranged at intervals of a second angle θ2 in the arc direction that is less than the first angle θ1. The intermediate scale 414 is located at the junction of the first scale area 412 and the second scale area 413. In this embodiment, the first angle θ1 indicates that the pressure difference between adjacent first scales 415 is 10 psi, and the second angle θ2 indicates that the pressure difference between adjacent second scales 416 is also 10 psi.

[0058] See Figure 3 、 Figures 6 to 8The indicator guide unit 42 includes a guide rod 421 positioned below the scale 41 and a pointer 422 positioned above the scale 41. One end of the pointer 422 is fixedly mounted on the top side of the guide rod 421 and is interlocked with the guide rod 421. When the guide rod 421 rotates due to the elastic displacement of the first rack unit 23, the guide rod 421 engages with the first tooth surface 235, driving the pointer 422 to rotate on the scale plate 411.

[0059] When the indicating guide unit 42 engaged with the first tooth surface 235 and / or the second tooth surface 335 is located in a first sensing interval, the indicating guide unit 42 points to the first scale area 412; when located in an intermediate position, the indicating guide unit 42 points to the intermediate scale 414; when located in a second sensing interval, the indicating guide unit 42 points to the second scale area 413.

[0060] In detail, when in use, the inflation device inflates the object to be inflated, and the pressure gauge is subjected to a predetermined air pressure generated by the gas from the inflation device. The gas enters the first shell 12 and the second shell 13 from the gas connecting tube 11. At this time, the first rack unit 23 and the second rack unit 33 are pushed by the same predetermined air pressure and elastically displaced to the right. The indicating guide unit 4 is located in the first sensing interval, and the guide rod 421 is engaged with the first tooth surface 235. It can be driven to rotate by the displacement of the first air pressure sensing mechanism 2, so that the pointer 422 is linked with the guide rod 421 and rotates from "0" in the first scale area 412. At the same time, the guide rod 421 corresponds to the second plane 336 in the axial position L, and does not engage with the second tooth surface 335. In this embodiment, the first air pressure range represented by the first scale area 412 is greater than 0 and less than 40psi. If the predetermined air pressure is within the first air pressure range, the pointer 422 stays in the first scale area 412 .

[0061] If the predetermined air pressure exceeds the first air pressure range, the first elastic member 22 and the second elastic member 32 are continuously compressed by the first rack unit 23 and the second rack unit 33, respectively, causing the first rack unit 23 and the second rack unit 33 to continue to elastically displace to the right until the guide rod 421 simultaneously engages the first tooth surface 235 and the second tooth surface 335. At this point, the pointer 422 points to the middle scale 414, and the indicator guide unit 42 shifts to the middle position. If the predetermined air pressure is the pressure value of the middle scale 414, the pointer 422 remains at the middle scale 414. In this embodiment, the pressure value represented by the middle scale 414 is 40 psi.

[0062] If the predetermined air pressure is greater than the air pressure value of the intermediate scale 414, the first elastic member 22 and the second elastic member 32 are continuously compressed by the first rack unit 23 and the second rack unit 33, respectively, causing the first rack unit 23 and the second rack unit 33 to continue to elastically displace to the right. At this point, the guide rod 421 leaves the first tooth surface 235 and is positioned relative to the first plane 236. The guide rod 421 engages only with the second tooth surface 335 and is driven to rotate by the displacement of the second air pressure sensing mechanism 3, causing the pointer 422 to interlock with the guide rod 421 and point to the second scale area 413, shifting the indicator guide unit 4 to the second sensing range. In this embodiment, the second scale area 413 represents a second air pressure range greater than 40 psi and less than 160 psi.

[0063] In this embodiment, the first housing 12 and the second housing 13 are both located on the right side of the gas communication tube 11 , so that the first rack unit 23 and the second rack unit 33 move in the same direction when driven.

[0064] Because the elastic coefficient of the first elastic member 22 is smaller than that of the second elastic member 32, when subjected to the same predetermined gas thrust, the elastic displacement of the first rack unit 23 is greater than the elastic displacement of the second rack portion 332. Furthermore, because the deflection angle of the pointer 422 of the indicator guide unit 42 is positively correlated solely with the elastic displacement of the first rack unit 23 when in the first sensing range, and the deflection angle of the pointer 422 of the indicator guide unit 4 is positively correlated solely with the elastic displacement of the second rack unit 33 when in the second sensing range, when subjected to the same predetermined gas thrust, the deflection angle of the pointer 422 of the indicator guide unit 4 in the first sensing range is greater than the deflection angle of the pointer 422 of the indicator guide unit 4 in the second sensing range. Therefore, compared to the pointer 422 pointing to the second scale area 413, the pointer 422 pointing to the first scale area 412 can more sensitively and accurately point to the sensed predetermined gas pressure value.

[0065] Furthermore, since the deflection angle of the pointer 422 is controlled by a single elastic member (the first elastic member 22 or the second elastic member 32) and is proportional to the elastic deformation of the elastic member, it is also quite easy to convert between the elastic deformation and the deflection angle of the pointer 422 when making the scale 41, so that the position of each first scale 415 and each second scale 416 can be accurately drawn.

[0066] See Figures 9 to 12, which is a second embodiment of the pressure gauge of the present invention. This second embodiment is similar to the first embodiment, differing in that the first housing 12 and the second housing 13 are disposed in opposite directions along the axial direction L and are arranged horizontally and side by side below the scale 41. The first air pressure sensing mechanism 2 and the second air pressure sensing mechanism 3 are also disposed in opposite directions along the axial direction L.

[0067] In practice, the gas communication tube 11 is divided into a first communication tube 111 and a second communication tube 112. The first communication tube 111 is in gaseous communication with the pumping device and the first space 122 of the first housing 12. The second communication tube 112 is in gaseous communication with the pumping device and the second space 132 of the second housing 13. Because the first and second air pressure sensing mechanisms 2 and 3 are arranged in opposite directions, the first and second rack units 23 and 33 move in opposite directions when driven.

[0068] See Figure 6 and Figure 12 When the indicating guide unit 42 is in the first sensing range, the guide rod 421 only engages with the first tooth surface 235 and the position in the axial direction L corresponds to the second plane 336, but does not engage with the second tooth surface 335. When the indicating guide unit 42 is in the middle position, the guide rod 421 engages with both the first tooth surface 235 and the second tooth surface 335. Figure 13 When the indicating guide unit 42 is in the second sensing interval, the guide rod 421 only engages with the second tooth surface 335 , and the position in the axial direction L corresponds to the first plane 236 , and does not engage with the first tooth surface 235 .

[0069] See Figures 14 to 17 , which is a third embodiment of the pressure gauge of the present invention. The third embodiment is similar to the first embodiment, except for the housing mechanism 1 and the indicator guide unit 42. The differences are described in detail below.

[0070] The gas communication tube 11 is divided into a first communication tube 111 and a second communication tube 112. The first communication tube 111 is in gaseous communication with the pumping device and with the first space 122 of the first housing 12. The second communication tube 112 is in gaseous communication with the pumping device and with the second space 132 of the second housing 13. The first and second housings 12, 13 are no longer stacked vertically in the same direction, but are now arranged horizontally and side by side in the same direction below the scale 41.

[0071] The indicating guide unit 42 has two guide rods 421. The guide rods 421 are divided into a first guide rod 423 and a second guide rod 424. The first guide rod 423 is engaged with the first tooth surface 235 and can be driven to rotate when the first tooth surface 235 is displaced. The second guide rod 424 is engaged with the first guide rod 423 and can be driven to rotate by the displacement of the second tooth surface 335 when engaged with the second tooth surface 335. One end of the pointer 422 is sleeved on the top of the first guide rod 423. In this embodiment, the first guide rod 423 and the second guide rod 424 are also inserted into a fixing plate 425 and the first shell 12 to enhance the stability of the first guide rod 423 and the second guide rod 424. In other variations of this embodiment, the pointer 422 can also be sleeved on the top of the second guide rod 424.

[0072] See Figure 6 and Figure 17 When the indicator guide unit 42 is in the first sensing range, the first guide rod 423 is engaged with the first tooth surface 235 and is driven by the first rack unit 23 to rotate, thereby causing the pointer 422 to rotate and point to the first scale area 412. When the indicator guide unit 42 is in the middle position, the first guide rod 423 is engaged with the first tooth surface 235, and the second guide rod 424 is engaged with the second tooth surface 335, and the pointer 422 points to the middle scale 414. Figure 6 and Figure 18 When the indicating guide unit 42 is in the second sensing interval, the first guide rod 423 is not engaged with the first tooth surface 235, and the second guide rod 424 is engaged with the second tooth surface 335 and is driven to rotate by the second rack unit 33, thereby causing the pointer 422 to rotate and point to the second scale area 413.

[0073] In this embodiment, the first rack unit 23 and the second rack unit 33 also move in the same direction.

[0074] See Figures 19 to 22 , which is a fourth embodiment of the pressure gauge of the present invention. This fourth embodiment is similar to the first embodiment, differing in the housing mechanism 1 and the guide rod 421 of the indicator guide unit 42. Furthermore, this fourth embodiment includes a third air pressure sensing mechanism 5. The differences are described in detail below.

[0075] The housing mechanism 1 also includes a third housing 14. The third housing 14 is disposed between the scale 41 and the second housing 13. Similar in structure to the second housing 13, it defines a third vent 141, a third space 142, and a third slot 143. The third vent 141 extends through the third housing 14 along the axial direction L. The third space 142 extends along the axial direction L and is in gaseous communication with the third vent 141. The third slot 143 radially extends through the third housing 14 and extends along the axial direction L.

[0076] See Figures 20 to 22 The third air pressure sensing mechanism 5 is mounted on the third housing 14 and is adapted to elastically displace when subjected to the predetermined air pressure, thereby driving the indication guide unit 42 to further shift to a third sensing interval. The third air pressure sensing mechanism 5 includes a third end plug 51, a third elastic member 52, and a third rack unit 53. The third end plug 51 is fixedly screwed on a side of the third space 142 opposite to the third vent 141. The third elastic member 52 is disposed in the third space 142 and has an elastic coefficient greater than that of the second elastic member 32. The third elastic member 52 is connected between the third end plug 51 and the third rack unit 53.

[0077] The third rack unit 53 has a third tooth base 531 and a third rack portion 532. The third tooth base 531 is movably inserted into the third space 142. The third rack portion 532 is connected to the third tooth base 531 and is exposed from the third slot 143 to the outside of the third housing 14. It has a third tooth surface 533 for engaging with the guide rod 421 and a third plane 534 connected to the third tooth surface 533. When the third rack unit 53 is subjected to gas pressure from the third vent 141, it is displaced along the axial direction L and pressed against the third elastic member 52, causing it to elastically deform. Therefore, the third air pressure sensing mechanism 5 can be elastically displaced when it is subjected to a predetermined air pressure from the inflation device through the gas connecting pipe 11.

[0078] The scale plate 411 also has a third scale area 417. This third scale area 417 indicates a third pressure range that is not less than the second pressure range. The indicator guide unit 42 can further switch to a third sensing range. When the indicator guide unit 42 is in the third sensing range, the guide rod 421 only engages the third tooth surface 533 and is driven to rotate when the third tooth surface 533 moves, causing the pointer 422 to move in conjunction with the third scale area 417.

[0079] In summary, the pressure gauge with a zoned scale of the present invention utilizes the first elastic member 22 and the second elastic member 32 to provide different elastic displacements to the first rack unit 23 and the second rack unit 33, respectively, and the design of the guide rod 421 that can be driven to rotate only when engaged with the first air pressure sensing mechanism 2 or the second air pressure sensing mechanism 3. This allows the pressure gauge's pointer 422 to be driven by different single elastic members (the first elastic member 22 or the second elastic member 32) when sensing different air pressure ranges. Under the same unit air pressure difference, the pointer 422 has different deflection angles, thereby more accurately indicating the normal or low pressure range. Furthermore, since the first angle θ1 is related only to the elastic coefficient of the first elastic member 22 and not to the second elastic member 32, and the second angle θ2 is related only to the second elastic member 32 and not to the first elastic member 22, the first angle θ1 and the second angle θ2 can be relatively easily converted from the elastic coefficients of the corresponding elastic members. Therefore, when manufacturing the pressure gauge, it is also quite easy to accurately draw the scale position of each scale area on the scale 41, so the purpose of the present invention can be truly achieved.

[0080] The above descriptions are merely embodiments of the present invention and should not be used to limit the scope of the present invention. In other words, any simple equivalent changes and modifications made according to the claims and description of the present invention still fall within the scope of the present invention.

Claims

1. A pressure gauge with a zoned scale, suitable for measuring the air pressure of an airway of an inflatable device, comprising a housing structure adapted to communicate with the airway of the inflatable device, characterized in that: The pressure gauge with partitioned scales also includes a first air pressure sensing mechanism, a second air pressure sensing mechanism, and a display mechanism. The first air pressure sensing mechanism is installed on the housing mechanism and is adapted to move when subjected to the air pressure. The second air pressure sensing mechanism is installed on the housing mechanism and is adapted to move when subjected to the air pressure. The display mechanism is installed on the housing mechanism and includes a scale plate and an indication guide unit. The indication guide unit can engage with the first air pressure sensing mechanism and the second air pressure sensing mechanism and can switch between a first sensing interval and a second sensing interval. The scale plate has a first scale area representing a first pressure range and a second scale area representing a second pressure range not less than the first pressure range. When the indication guide unit is engaged and located in the first sensing interval, the indication guide unit points to the first scale area. When the indication guide unit is engaged and located in the second sensing interval, the indication guide unit points to the second scale area.

2. The pressure gauge with zoned scale according to claim 1, characterized in that: The housing mechanism includes a first housing and a second housing, the first housing is in gas communication with the inflatable device and has a first space extending in the axial direction, the second housing is in gas communication with the inflatable device and has a second space extending in the axial direction, the first air pressure sensing mechanism includes a first elastic member and a first rack unit, the first elastic member is arranged in the first space of the first housing, the first rack unit has a first tooth base and a first rack portion, the first rack portion is exposed to the first housing of the housing mechanism, the first elastic member has a first fixed end portion that does not move relative to the first housing, and a first fixed end portion that abuts against the first rack unit. The first movable end portion, the first rack unit can be elastically displaced when subjected to the air pressure, the second air pressure sensing mechanism also includes a second elastic member and a second rack unit, the second elastic member is arranged in the second space of the second shell, the second rack unit has a second tooth base and a second rack portion, the second rack portion is exposed to the second shell of the shell mechanism, the second elastic member has a second fixed end portion that does not move relative to the second shell, and a second movable end portion that presses against the second rack unit, the second rack unit can be elastically displaced when subjected to the air pressure, and the elastic coefficient of the second elastic member is greater than the elastic coefficient of the first elastic member.

3. The pressure gauge with zoned scale according to claim 2, characterized in that: The first rack unit and the second rack unit move in the same direction during elastic displacement.

4. The pressure gauge with zoned scale according to claim 2, wherein: The first rack unit and the second rack unit move in opposite directions during elastic displacement.

5. The pressure gauge with zoned scale according to claim 2, wherein: The first shell is further formed with a first slot and a first vent, the first slot radially penetrating the first shell and extending along the axial direction, the first vent axially penetrating and communicating with the first space and being suitable for communicating with the gas of the inflatable device, the first tooth base is located in the first space and connected to the first moving end of the first elastic member, the first rack portion is connected to the first tooth base and exposed from the first slot, the first rack portion having a first tooth surface for engaging with the indicating guide unit, the second shell is further formed with a second slot and a second vent, the second slot radially penetrating the second shell and extending along the axial direction The second rack unit has a second tooth base and a second rack portion, and the second tooth base is located in the second space and is connected to the second movable end of the second elastic member. The second rack portion is connected to the second tooth base and is exposed from the second slot. The second rack portion has a second tooth surface for engaging with the indicating guide unit. When the indicating guide unit is in the first sensing interval, it is driven by the first tooth surface to rotate, and when the indicating guide unit is in the second sensing interval, it is driven by the second tooth surface to rotate.

6. The pressure gauge with zoned scale according to claim 5, characterized in that: The first air pressure sensing mechanism also includes a first end plug, which is fixed to the first shell and connected to the first fixed end of the first elastic member. The second air pressure sensing mechanism also includes a second end plug, which is fixed to the second shell and connected to the second fixed end of the second elastic member.

7. The pressure gauge with zoned scale according to claim 1, wherein: The indicating guide unit has at least one guide rod and a pointer. The at least one guide rod is engaged with the first air pressure sensing mechanism. The pointer is connected to the at least one guide rod with one end portion. When the at least one guide rod is driven by the first air pressure sensing mechanism, the pointer points to the first scale area. When the at least one guide rod is driven by the second air pressure sensing mechanism, the pointer points to the second scale area.

8. The pressure gauge with zoned scale according to claim 5, characterized in that: The indicating guide unit includes a first guide rod that can be driven and rotated when engaged with the first air pressure sensing mechanism, a second guide rod that is engaged with the first guide rod and can be driven and rotated when engaged with the second air pressure sensing mechanism, and a pointer connected to one of the first guide rod and the second guide rod with one end thereof. When the first guide rod is driven by the first rack unit, the pointer points to the first scale area, and when the second guide rod is driven by the second rack unit, the pointer points to the second scale area.

9. The pressure gauge with zoned scale according to claim 8, characterized in that: The first scale area has a plurality of first scales arranged at first angle intervals in the arc direction, the second scale area is connected to the first scale area in the arc direction, and has a plurality of second scales arranged at second angle intervals smaller than the first angle in the arc direction, the scale plate surface also has an intermediate scale located at the junction of the first scale area and the second scale area, and the indicating guide unit will further change to an intermediate position. At the intermediate position, the indicating guide unit is simultaneously engaged with the first tooth surface and the second tooth surface, and the pointer points to the intermediate scale.

10. The pressure gauge with zoned scale according to claim 1, wherein: The pressure gauge with a partitioned scale also includes a third air pressure sensing mechanism, which is installed in the housing mechanism. The third air pressure sensing mechanism is suitable for moving when subjected to the air pressure. The scale plate also has a third scale area, which represents a third pressure range that is not less than the second pressure range. The indicating guide unit can be further transformed to a third sensing interval. When in the third sensing interval, the indicating guide unit engages with the third air pressure sensing mechanism and is driven by the third air pressure sensing mechanism to point to the third scale area.

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