pressure gauge

Abstract

Pressure measuring device, comprising: a first locking unit (20) having a first guide recess (211), a second guide recess (221), a central guide bore (23) arranged axially between and in communication with the first guide recess (211) and the second guide recess (221), and a guide unit (24) arranged on the upper side of the central guide bore (23), the guide unit (24) being provided on opposite sides with a first and a second screw pitch (D1, D2), each of which is assigned to a guide groove; a second locking unit (30) arranged on the underside of the first locking unit (20) and having a first end portion (31) and a second end portion (32) connected to each other by an inner hollow structure; a rotary member (40) comprising a rotary shaft (41), wherein a pointer (45) and a projection (44) are formed on opposite sides of the upper end surface of the rotary shaft (41), which are arranged along the same horizontal axis to each other; and a positioning unit (50) comprising a positioning block (51) and an elastic membrane element (52), the positioning block (51) having a central air opening (53) at its center, to which one end of the elastic membrane element (52) is attached, while the other end of the elastic membrane element (52) abuts the underside of the rotary shaft (41) of the rotary part (40); wherein the first locking unit (20) is vertically connected to the second locking unit (30), the positioning unit (50) is inserted on the underside of the second locking unit (30), and the lower end of the rotary shaft (41) of the rotary part (40) is guided through the central guide bore (23) of the first locking unit (20), while the pointer (45) and the projection (44) abut the opposite guide grooves of the first and second screw pitches (D1, D2) of the guide unit (24); wherein compressed air is introduced into the elastic membrane element (52) by an external compressed air source connected to the central air opening (53) of the positioning block (51), so that the elastic membrane element (52) expands in the inflated state and its wave-folded portion (521) is stretched upwards and an upward force is transmitted which moves the elastic membrane element (52) upwards and at the same time lifts the rotary part (40) in the axial direction, so that the pointer (45) moves upwards along the guide groove of the guide unit (24); wherein in the venting state, the wave-shaped folded portions (521) of the elastic membrane element (52) spring back downward and generate a downward force, thereby reducing the volume of the elastic membrane element (52) and lowering the rotary member (40), thereby providing a visual indication of the gas pressure value.

Description

[0001] The present invention relates to an improved structure of a pressure gauge, in particular a pressure gauge for detecting and displaying a gas pressure value.

[0002] Currently, mechanical pressure gauges are known in various designs according to the state of the art. For example, Taiwanese utility model M368063 describes a pressure gauge structure in which the connection between the supporting element and the support element is very complex. This design requires multiple machining steps and has the disadvantage of being irreversibly assembled. Once assembled, the assembly cannot be disassembled and reassembled, which significantly complicates maintenance and repair. In detail, the support element consists of a single metal component. After the supporting element is mounted to the underside of the support element, the support element is machined using a press so that its lower edge forms an inwardly bent folded edge. This fixes the supporting element, the seal, and the diaphragm within this folded edge.

[0003] Although this mounting method provides a stable structure, it has significant disadvantages: 1. Need for special assembly technology: Assembly requires a press machine, which increases production costs. 2. Non-disassemblable: After being deformed by the press, the support element is difficult to return to its original state. Disassembly requires cutting or destroying the folded edge, which renders the support element permanently unusable. This makes repairs or maintenance virtually impossible. 3. High assembly effort and high costs: Mechanical pressure gauges of this type consist of many individual parts that require complex assembly. For example, the pointer shaft assembly includes several components such as a bearing axis, a crossbar, a pointer, and a rotating element. This not only results in high assembly labor but also significant material costs.

[0004] These limitations highlight the need for an improved structure for mechanical pressure gauges that allows for easier assembly, disassembly for maintenance purposes, and reduction of production costs.

[0005] The invention is based on the object of creating a pressure measuring device, in particular a mechanism in which one end of the rotating shaft is guided through a central guide bore of a first locking unit, while the other end is provided with a pointer that rests against the screw guide of a guide unit. An elastic diaphragm element of the positioning unit is placed over the central air opening of the positioning block and simultaneously rests against the underside of the rotating shaft of the rotating part. By introducing external gas pressure via the central air opening, the elastic diaphragm element expands, whereby the rotating part is pushed upward and the pointer rotates upward along the screw guide. This enables precise visual detection of the gas pressure value.

[0006] This object is achieved according to the invention by a pressure measuring device having the features specified in claim 1. Further advantageous developments of the invention emerge from the features of the subclaims.

[0007] According to the invention, a pressure gauge is provided, comprising: a first locking unit having a first guide recess, a second guide recess, a central guide bore connecting the first and second guide recesses, and a guide unit arranged on the upper side of the central guide bore, the guide unit being provided on opposite sides with first and second screw pitches, each having a guide groove; a second locking unit arranged on the underside of the first locking unit and having first and second end portions connected to each other; a rotary part having a rotary shaft, a pointer and a projection being formed on opposite sides of the upper end surface of the rotary shaft, said pointer and a projection being arranged along the same horizontal axis with respect to each other; and a positioning unit,which comprises a positioning block and an elastic diaphragm element, wherein the positioning block has a central air opening at its center, over which one end of the elastic diaphragm element is slipped, while the other end rests against the underside of the rotating shaft of the rotating part. The first and second locking units are vertically connected to one another, the positioning unit is embedded on the underside of the second locking unit, and the rotating shaft of the rotating part is guided through the central guide bore of the first locking unit. The pointer and the projection rest against the opposite guide grooves of the first and second screw pitches of the guide unit. By connecting the central air opening of the positioning block to an external compressed air source, compressed air is fed into the elastic diaphragm element.causing it to expand and simultaneously push the rotating part upward. This moves the pointer upward along the guide groove of the guide unit, providing a visual indication of the current gas pressure value.

[0008] The invention and its embodiments are explained in more detail below with reference to the drawing. The drawing shows: Fig. 1 a perspective view of the pressure measuring device according to the invention; Fig. 2 is a perspective exploded view of the pressure gauge according to the invention; Fig. 3 a sectional side view of the pressure measuring device according to the invention; Fig. 4 a schematic representation of the operation of the pressure gauge in the inflated state; Fig. 5 a first schematic representation of the movement of the pointer during pressure measurement; Fig. 6 a second schematic representation of the movement of the pointer during pressure measurement; and Fig. 7 a schematic representation of the installation of the pressure gauge on a shoe body.

[0009] With reference to the Fig. 1 to Fig. 3 The structural composition of the invention and the connection of the individual components are described below.

[0010] The improved structure of a pressure gauge 100 comprises a first locking unit 20, a second locking unit 30, a rotary member 40, and a positioning unit 50. The first locking unit 20 has a first guide recess 211 and a second guide recess 221, which are connected to one another via a central guide bore 23. A guide unit 24 is arranged on the upper side of the guide bore 23 and is provided with a first and a second screw pitch D1, D2. The guide unit 24 also has screw grooves that run along the first and second screw pitch D1, D2 and serve as a guide for the movement of the rotary member 40. The second locking unit 30 is arranged below the first locking unit 20 and has an annular first end portion 31 and an open second end portion 32, which are in fluid communication with one another.

[0011] The rotating part 40 is provided with a hollow cylindrical rotating shaft 41, which is rotatably mounted within the guide bore 23 of the first locking unit 20. The upper end surface of the rotating shaft 41 is provided on opposite sides with a radially outwardly projecting projection 44 and a pointer 45 arranged in the same horizontal axial direction. These are fixedly connected to the rotating shaft 41 and move synchronously with its rotational movement. The positioning unit 50 is positioned on the underside of the second end section 32 of the second locking unit 30. It has a positioning block 51 with a central air opening 53 and an elastic diaphragm element 52, one end of which is inserted into the air opening 53 of the positioning block 51 and the other end of which rests against the rotating part 40.Compressed air is supplied via the air opening 53 by an external compressed air source connected to the positioning unit 50, thereby pushing the elastic diaphragm element 52 upward. This causes an axial upward movement of the rotating shaft 41 of the rotating part 40. At the same time, the projection 44 and the pointer 45 engage the screw pitches D1, D2 of the guide unit 24 and rotate upward along the pitches, thus achieving a precise indication of the gas pressure value.

[0012] According to Fig. 1 to Fig. 3, the first locking unit 20 has a locking section 21, a connecting section 22, a central guide bore 23, and a guide unit 24. The locking section 21 is annular and has an inwardly recessed, first guide recess 211 on its inner, circumferential upper surface. In the center of the first guide recess 211, the guide unit 24 extends upward, adjacent to the upper opening of the central guide bore 23. The guide unit 24 has two offset, corresponding arcuate surfaces on opposite sides: a first arcuate surface 241 and a second arcuate surface 242. The two arcuate surfaces 241, 242 each have two end regions that have different heights and are provided with specific angular positions.The first arcuate surface 241 extends from a first angular range 2411 [lower position] upwards along a spiral pitch to a second angular range 2412 [higher position], thus forming a first screw pitch D1. The second arcuate surface 242 extends from a first angular range 2421 [lower position] upwards along a spiral pitch to a second angular range 2422 [higher position], thus forming a second screw pitch D2. The connecting portion 22 is provided on the inside with a downwardly open second guide recess 221. The central guide bore 23 communicates with the first and second guide recesses 211, 221 and serves to receive the rotating part 40, which extends through it.

[0013] As in Fig. As shown in Figure 6, a display panel 25 printed with a scale 251 for displaying the pressure value can be mounted on the upper surface of the first guide recess 211 of the first locking unit 20. The pressure values of the scale 251 are identified by three adjacent display areas 251a, 251b, and 251c, which are visually highlighted by differently colored segments or color markings. The first display area 251a is predefined as a range for low pressure values and extends from 0 to 30 degrees. The second display area 251b represents a medium pressure value range and extends from 30 to 60 degrees. The third display area 251c displays high pressure values and extends from 60 to 90 degrees. This arrangement allows the scale 251 to clearly visually assign the pressure value according to the movement of the pointer, ensuring clear and intuitive readability of the pressure values.

[0014] The first locking unit 20 further comprises a cover 70 made of a translucent material, such as a PVC display panel. The cover 70 has a central recess on its inner side in which a first and a second inlet groove 71, 72 are formed. These inlet grooves 71, 72 are designed such that they can be precisely assembled with the guide unit 24 of the first locking unit 20, with the first curved surface 241 and the second curved surface 242 of the guide unit 24 being embedded in the corresponding inlet grooves 71, 72. This arrangement forms a circular movement track within which the pointer 45 and the projections 44 of the rotating part 40 can move. On the outer edge of the cover 70, a locking portion 73 is provided, which corresponds to the locking portion 21 of the first locking unit 20 and enables a positive connection.After the cover 70 is assembled with the first locking unit 20, an interior space A is formed, which serves as a free space for the pivoting movement of the pointer 45.

[0015] The first locking unit 20 further includes a spring 60 disposed at the upper edge of the first and second inlet grooves 71, 72 of the cover 70. When the rotating member 40 is pushed upward and rotated by the gas pressure exerted on the elastic diaphragm element 52, the spring 60 is elastically compressed, generating a restoring force. Once the upward force acting on the rotating member 40 decreases, the spring 60 releases its stored elastic energy and ensures that the rotating member 40 returns to its original position and the pointer 45 is reset to the zero point of the scale.

[0016] The second locking unit 30 is formed as an annular structure and includes a first end portion 31 and a second end portion 32 that are connected to each other. The first end portion 31 is provided on its upper surface with a downwardly recessed, hollow receiving structure 311. A fitting structure 312 is formed on the underside of the second end portion 32 and is connected to the receiving structure 311. The fitting structure 312 has a larger diameter than the receiving structure 311, thereby creating a stepped internal structure.The first end portion 31 of the second locking unit 30 is opposite the second guide recess 221 of the first locking unit 20 such that the connecting portion 22 of the first locking unit 20 projects into the receiving structure 311, wherein the fitting structure 312 of the second end portion 32 serves as a support surface for the positioning block 51 of the positioning unit 50.

[0017] On the underside of the second end portion 32 of the second locking unit 30, the fitting structure 312 can additionally be provided with a closure cover (not shown). The closure cover is designed to rest against the lower edge of the positioning block 51 of the positioning unit 50 and form a precise connection with the fitting structure 312. A through hole is formed in the center of the closure cover, which is axially aligned with the first and second end portions 31, 32 of the second locking unit 30. This through hole serves as a connection point for an external pressure source (not shown), through which the required gas pressure can be fed into the system.

[0018] The rotating part 40 comprises a rotating shaft 41 provided with a through hole 42 at its center. A T-shaped stop plate can be attached to the lower end of the through hole 42, which serves as a uniform pressure transmission surface. On the upper end surface of the rotating shaft 41, a projection 44 is formed on one side, while a pointer 45 is located on the opposite side. The projection 44 and the pointer 45 are arranged along the same horizontal axis with respect to each other, with the pointer 45 having a greater length than the projection 44. The projection 44 and the pointer 45 are each designed to engage the screw grooves of the first and second screw pitches D1, D2 of the guide unit 24 of the first locking unit 20. This enables a controlled rotational movement along the spiral guide.At the same time, the movement occurs within the rotational path formed by the first and second inlet grooves 71, 72 of the cover 70, which additionally guides and limits the rotational movement. The rotary shaft 41 is rotatably mounted within the central guide bore 23 of the first locking unit 20, so that when compressed air flows in, the force transmitted to the rotary shaft 41 causes the pointer 45 to rotate synchronously with the rotary shaft along the screw guide.

[0019] The T-shaped stop plate attached to the lower end of the rotating part 40 can be designed as a screw head. Alternatively, the lower end of the rotating part 40 with the T-shaped stop plate can be designed as a one-piece integrated threaded rod.

[0020] The elements arranged on opposite sides of the upper end surface of the rotary shaft 41, the projection 44 and the pointer 45, are aligned along the same horizontal axis. They are arranged to contact the first angular range (lower position) 2411, 2421 of the first and second arcuate surfaces 241, 242 of the guide unit 24 of the first locking unit 20, respectively, thereby defining the initial position as the zero position. When pressure is applied, the projection 44 and the pointer 45 move upward along the spiral guide paths of the first and second arcuate surfaces 241, 242 and reach the second angular ranges (higher position) 2412, 2422. This position represents the final position caused by the pressure.

[0021] The protrusion 44 and the pointer 45, located on opposite sides of the upper end surface of the rotary shaft 41, are aligned along the same horizontal axis. They are designed so that the protrusion 44 and the pointer 45 can be moved according to the external gas pressure supplied to the positioning unit 50 through the air hole 53 of the positioning block 51. When compressed air is supplied through the air hole 53 of the positioning block 51, the elastic diaphragm element 52 expands and pushes the lower end of the rotary part 40 axially upward. As a result, the projection 44 and the pointer 45 move along the first and second arcuate surfaces 241, 242 of the guide unit 24 of the first locking unit 20. The projection 44 slides along the screw groove of the first screw pitch portion D1, starting from the first angular range [lower position] 2411 of the first arcuate surface 241 upwards to the second angular range [higher position] 2412.At the same time, the pointer 45 moves along the screw groove of the second screw pitch section D2, starting from the first angular range [lower position] 2421 of the second arc surface 242 to the second angular range [higher position] 2422. This synchronized movement guided by the screw pitches ensures a precise indication of the pressure value, as the pointer 45 slides upwards and moves along the scale in proportion to the gas pressure supply.

[0022] The positioning unit 50 comprises a positioning block 51 and an elastic membrane element 52. The positioning block 51 is designed as an inverted T-shaped sealing disc and has a central air opening 53 that is axially aligned with the first and second end sections 31, 32 of the second locking unit 30. The positioning block 51 is positioned in the area of the fitting structure 312 of the second locking unit 30. A closure cap [not shown] with a central through-hole can optionally be attached to the underside. The elastic membrane element 52 is made of an elastic material and is designed as a plug sleeve. Its lower end (base) is shaped as an open sleeve and slipped over the air opening 53 at the upper end of the positioning block 51. This creates a flexible chamber that can elastically expand when compressed air is introduced.The upper end of the elastic diaphragm element 52 rests directly against the underside of the rotating part 40. The outer peripheral surface of the elastic diaphragm element 52 is provided with a telescopic, wave-folded section 521. When compressed air flows into the elastic diaphragm element 52 through the air hole 53, the wave-folded section 521 expands upward, creating an upward force. This lifts the elastic diaphragm element 52 and transmits the movement to the rotating part 40, which moves along the screw guides. When the pressure decreases or escapes, the wave-folded section 521 retracts to its original folded shape. This creates a downward force that returns the elastic diaphragm element 52 to its original position, thus returning the rotating part 40 to the zero position.This design allows flexible, precisely controlled movement of the rotating part 40 and ensures reliable return when pressure is released.

[0023] The positioning block 51 of the positioning unit 50 can be provided with a fitting structure 54 at the location opposite the connecting section 22 of the first locking unit 20, which fitting structure forms a corresponding contact surface. The first locking unit 20 and the second locking unit 30 are vertically locked and connected to one another. A clamping space B is created between the locking section 21 of the first locking unit 20 and the first end section 31 of the second locking unit 30. This clamping space B serves to securely fix the pressure gauge to the surface of a gas pressure object 200 to be tested, such as sports or leisure shoes or inflatable chamber structures.After attachment, the internal inflatable air chamber of the gas pressure object 200 to be tested can be connected to the through hole 331 of the protruding connection portion 33 of the second locking unit 30, so that the pressure gauge is installed and can visually display the current gas pressure of the object 200.

[0024] During operation, as described in the Fig.As shown in Figures 4 to 6, the pressure gauge 100 can be quickly and easily attached to the mounting opening of a gas pressure object 200 to be tested with an integrated internal air cushion X by vertically connecting the first locking unit 20 to the second locking unit 30. In the present embodiment, the gas pressure object 200 to be tested is designed as a shoe body, but the application is not limited thereto. The internal air cushion X of the gas pressure object 200 to be tested [e.g., a shoe body] is connected to the central air opening 53 of the positioning block 51 of the positioning unit 50, which is located in the fitting structure 312 of the second end portion 32 of the second locking unit 30.When the internal air cushion X of the gas pressure object 200 to be tested is inflated or supplied with compressed air via an external compressed air pump (not shown), the compressed air flows into the positioning block 51 of the positioning unit 50 through the central air opening 53. The resulting pressure causes the elastic membrane element 52 to move upward and its wave-folded portion 521 to expand. At the same time, the lifting force generated by the elastic membrane element 52 transmits the pressure to the underside of the rotating part 40, thereby pushing it upward. At this moment, the projection 44 and the pointer 45, which are arranged on opposite sides of the upper end of the rotating shaft 41 along the same horizontal axis, move along the first and second arc surfaces 241, 242 of the guide unit 24.They slide from the first angular ranges [lower position] 2411, 2421 along the screw pitches D1, D2 upwards to the second angular ranges [higher position] 2412, 2422. In this embodiment, the movement occurs clockwise. With the rotation of the pointer 45, the corresponding gas pressure value is displayed on the pressure scale arranged on the upper surface of the first guide recess 211 of the first locking unit 20. This allows the gas pressure value currently introduced into the inner air cushion X to be visualized in real time. Once the desired pressure value is reached, the user can stop the air flow, thereby completing the inflation process of the gas pressure object 200 to be tested. Should the pressure decrease after a certain period of use, the user can refill the gas pressure at any time to keep the inner air cushion X in an optimal operating state with saturated pressure.

[0025] In the pressure measuring device 100 according to the invention, the vertical connection of the first locking unit 20 to the second locking unit 30 enables quick and easy installation on a gas pressure object 200 to be tested. The rotating part 40 is designed such that its lower end, with the rotating shaft 41, is guided through the central guide bore 23 of the first locking unit 20. At the upper end of the rotating part 40, the pointer 45 and the projection 44 rest against the screw grooves of the guide unit 24 of the first locking unit 20. The positioning unit 50 has an elastic membrane element 52, the open end of which is slipped over the central air opening 53 of the positioning block 51, while the closed end of the elastic membrane element 52 rests against the underside of the rotating shaft 41 of the rotating part 40.When the gas pressure object to be tested is filled with compressed air, the air flows through the central air opening 53 into the positioning unit 50, causing the elastic diaphragm element 52 to expand and be pushed upward. The wave-folded section 521 of the elastic diaphragm element 52 unfolds and transfers the upward force to the rotating part 40. This pushes the rotating part 40 upward, causing the projection 44 and the pointer 45 to move upward along the screw grooves of the guide unit 24, enabling a precise indication of the current gas pressure. In the venting state, the wave-folded section 521 of the elastic diaphragm element 52 returns to its original shape. This downward force compresses the volume of the elastic diaphragm element 52 and lowers the rotating part 40 accordingly.This design enables a precise indication of the gas pressure value while simultaneously simplifying the construction. Compared to conventional mechanical pressure gauges, which require numerous components and complex assembly and maintenance processes, the pressure gauge according to the invention reduces the number of components and simplifies assembly and maintenance. Furthermore, errors due to improper disassembly or assembly are minimized, ensuring a simple, maintenance-friendly, and reliable pressure indication. List of reference symbols 100 pressure gauge 200 gas pressure object 20 first locking unit 21 Locking section 211 first guide recess 221 second guide recess 22 connecting section 23 central guide hole 24 management unit 241 first arch area 242 second arch area 2411, 2421 first angular range 2412, 2422 second angular range 30 second locking unit 31 first final section 311 Recording structure 312 fitting structure 32 second end section 40 Turned part 41 Rotating shaft 42 through hole 44 lead 45 hands 50 positioning unit 51 Positioning block 52 elastic membrane element 521 wave-folded section 53 central air opening 60 spring 70 Cover 71 first inlet groove 72 second inlet groove 73 Locking section A interior B Terminal room D1 first screw pitch D2 second screw pitch X Internal air cushion

Claims

[1] Pressure measuring device, comprising: a first locking unit (20) having a first guide recess (211), a second guide recess (221), a central guide bore (23) arranged axially between and in communication with the first guide recess (211) and the second guide recess (221), and a guide unit (24) arranged on the upper side of the central guide bore (23), the guide unit (24) being provided on opposite sides with a first and a second screw pitch (D1, D2), each of which is assigned to a guide groove; a second locking unit (30) arranged on the underside of the first locking unit (20) and having a first end portion (31) and a second end portion (32) connected to each other by an inner hollow structure; a rotary member (40) comprising a rotary shaft (41), wherein a pointer (45) and a projection (44) are formed on opposite sides of the upper end surface of the rotary shaft (41), which are arranged along the same horizontal axis to each other; and a positioning unit (50) comprising a positioning block (51) and an elastic membrane element (52), the positioning block (51) having a central air opening (53) at its center, to which one end of the elastic membrane element (52) is attached, while the other end of the elastic membrane element (52) abuts the underside of the rotary shaft (41) of the rotary part (40); wherein the first locking unit (20) is vertically connected to the second locking unit (30), the positioning unit (50) is inserted on the underside of the second locking unit (30), and the lower end of the rotary shaft (41) of the rotary part (40) is guided through the central guide bore (23) of the first locking unit (20), while the pointer (45) and the projection (44) abut the opposite guide grooves of the first and second screw pitches (D1, D2) of the guide unit (24); wherein compressed air is introduced into the elastic membrane element (52) by an external compressed air source connected to the central air opening (53) of the positioning block (51), so that the elastic membrane element (52) expands in the inflated state and its wave-folded portion (521) is stretched upwards and an upward force is transmitted which moves the elastic membrane element (52) upwards and at the same time lifts the rotary part (40) in the axial direction, so that the pointer (45) moves upwards along the guide groove of the guide unit (24); wherein in the venting state, the wave-shaped folded portions (521) of the elastic diaphragm element (52) spring back downward and generate a downward force, thereby reducing the volume of the elastic diaphragm element (52) and lowering the rotary member (40), thereby providing a visual indication of the gas pressure value. [2] Pressure measuring device according to claim 1, characterized by that on the inner circumferential surface of the first guide recess (211) of the first locking unit (20) a plurality of locking sections (21) are arranged at a defined distance from one another, wherein a connecting section (22) of the first locking unit (20) extends downwards from the central guide bore (23). [3] Pressure measuring device according to claim 1, characterized by that the first end portion (31) of the second locking unit (30) is provided with a receiving structure (311) and the second end portion (32) has a fitting structure (312) which is connected to the hollow receiving structure (311) of the first end portion (31). [4] Pressure measuring device according to claim 1, characterized by that the connecting portion (22) of the first locking unit (20) engages with the receiving structure (311) of the first end portion (31) of the second locking unit (30). [5] Pressure measuring device according to claim 1, characterized by that the lower end of the rotating part (40) is connected to a T-shaped stop plate. [6] Pressure measuring device according to claim 1, characterized by that the positioning block (51) of the positioning unit (50) is designed as an inverted T-shaped sealing disc. [7] Pressure measuring device according to claim 1, characterized by in that the first locking unit (20) further comprises a transparent PVC cover (70) which is provided with a first and a second inlet groove (71, 72) at the positions of the first and second screw pitch (D1, D2) of the guide unit (24), wherein the cover (70) can be locked to the first locking unit (20) and thereby forms a defined movement space for the rotational movement of the pointer (45). [8] Pressure measuring device according to claim 1, characterized bythat on the upper surface of the first guide recess (211) of the first locking unit (20) there is mounted a display panel (25) which has a scale for displaying pressure values. [9] Pressure measuring device according to claim 6, characterized by that a clamping space (B) is formed between the locking portion (21) of the first locking unit (20) and the first end portion (31) of the second locking unit (30). [10] Pressure measuring device according to claim 1, characterized by that the elastic membrane element (52) of the positioning unit (50) is designed as a hollow elastic rubber element which is provided on its outer peripheral surface with a telescopic, wave-shaped folded section (521) which expands or contracts depending on the pressure level and thereby serves as an elastic drive and transmission element for the vertical movement.

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