NL2008402C2 - Mechanical counter and flow meter provided with such counter. - Google Patents

Mechanical counter and flow meter provided with such counter. Download PDF

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Publication number
NL2008402C2
NL2008402C2 NL2008402A NL2008402A NL2008402C2 NL 2008402 C2 NL2008402 C2 NL 2008402C2 NL 2008402 A NL2008402 A NL 2008402A NL 2008402 A NL2008402 A NL 2008402A NL 2008402 C2 NL2008402 C2 NL 2008402C2
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NL
Netherlands
Prior art keywords
toothed surface
wheel
driven
direction
circumferential toothed
Prior art date
Application number
NL2008402A
Other languages
Dutch (nl)
Inventor
Bernardus Johannes Maria Lichtenberg
Josephus Theodorus Maria Bergervoet
Original Assignee
Elster Instromet B V
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Elster Instromet B V filed Critical Elster Instromet B V
Priority to NL2008402 priority Critical
Priority to NL2008402A priority patent/NL2008402C2/en
Application granted granted Critical
Publication of NL2008402C2 publication Critical patent/NL2008402C2/en

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Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06MCOUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M1/00Design features of general application
    • G06M1/04Design features of general application for driving the stage of lowest order
    • G06M1/041Design features of general application for driving the stage of lowest order for drum-type indicating means
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06MCOUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
    • G06M1/00Design features of general application
    • G06M1/04Design features of general application for driving the stage of lowest order
    • G06M1/048Design features of general application for driving the stage of lowest order with switching means between two or more counting devices

Description

Nr. NLP190740A

Mechanical counter and flow meter provided with such a counter

BACKGROUND OF THE INVENTION

The invention relates to a mechanical counter comprising a frame or housing provided with a shaft on which one or more counting wheels are arranged for indicating an addition of the rotation of a drive mechanism in a predetermined direction, wherein a counting wheel with the least significant digit location is coupled to a drive mechanism, and in particular to a counter for a flow meter for measuring a gas or liquid flow.

Such a mechanical counter comprises a shaft on which one or more counting wheels are mounted. The counting wheels are connected to each other with a suitable intermittent transmission and are each provided with the numbers '0' to '9' which are successively placed in front of a display window. When a counting wheel moves from '9' to '0', the position of the wheel of the next counting wheel is increased by 1 by a more significant digit location.

Although an increasing number of counters are being produced electronically, mechanical counters are still frequently used today because they do not need a supply voltage 2 and can easily be read visually.

In order to ensure a correct display of the added rotation, it is desirable on the one hand that the counter does not roll back if the drive mechanism is driven in a direction opposite to the predetermined direction, and on the other hand that the position of the counter is not due to external factors such as for example by vibrations acting on the counter.

10

SUMMARY OF THE INVENTION

It is therefore an object of the invention to provide a counter which at least substantially prevents a turning back of the counting wheels, and / or at least substantially prevents a change in the position of the counting wheels due to vibrations.

According to a first aspect, the invention provides for this purpose a mechanical counter as described in claim 1.

The mechanical counter according to the invention is characterized by a drive mechanism comprising: a drive wheel, a driven wheel which on the one hand is rotationally coupled to the counting wheel, and which on the other hand is connected to the drive wheel via a first freewheel coupling, the first freewheel coupling being adapted to rotatably couple the drive wheel and the driven wheel with a rotation of the drive wheel in the predetermined direction and to run freely with a rotation of the drive wheel in a direction opposite to the predetermined direction, and wherein the driven wheel via a second freewheel coupling is connected to the frame or housing, wherein the second freewheel coupling is arranged for rotationally coupling the driven wheel and the frame or housing with a rotation of the driven wheel in the direction opposite to the predetermined direction and free to run with a rotation of the driven wheel the predetermined direction.

A 'freewheel clutch', at least within the context of this application, is a mechanism that engages the driven element with the drive element, when the drive element moves in a first direction relative to the driven element, and which disengages a driven element from a drive element when the drive element moves relative to the driven element in a second direction opposite to the first direction. The mechanism thus provides a one-way transmission adapted to rotatably couple the driven element to the drive element when the drive element moves in the first direction relative to the driven element, and to disconnect the driven element from the drive element when it drive element relative to the driven element in the second direction.

The first freewheel clutch is adapted to rotatably couple the drive wheel to the driven wheel if the drive mechanism is driven in the predetermined direction and which provides a freewheel of the drive wheel relative to the driven wheel if the drive wheel is driven in a direction opposite to the predetermined direction. Thus, the one or more counting wheels are driven by the drive mechanism for adding a rotation of the drive mechanism in the predetermined device. If the driving mechanism is driven in a direction opposite to the predetermined direction, the freewheel is activated so that the one or more counting wheels are not driven.

In order to prevent the counters from turning back and / or displacing the counters by vibrations, the counting mechanism comprises a second freewheel coupling which blocks rotation of the driven wheel against the addition direction. This prevents the counting wheels 4 from being moved in the addition direction on the one hand by a drive in the direction opposite to the predetermined direction, but on the other hand also by external factors, such as vibrations.

The combination of these measures ensures that the mechanical counter according to the invention is at least less sensitive to deviations in the counter position due to external factors on the one hand and a drive of the drive mechanism in a direction opposite to the predetermined direction on the other hand. As a result, the counter position of the mechanical counter according to the invention provides a more correct representation of the added rotation in the predetermined direction.

In a first embodiment, the driven wheel comprises a first and a second circumferential toothed surface, the driven wheel comprising a first and a second circumferential toothed surface, wherein the driving wheel is rotatably coupled to a carrier that substantially abuts the first circumferential toothed surface, wherein the driver together with the first circumferential toothed surface forms the first freewheel coupling and is adapted to engage one or more teeth of the first circumferential toothed surface if the drive wheel is driven in the predetermined direction and around slipping over the teeth of the first circumferential toothed surface if the drive wheel is driven in a direction opposite to the predetermined direction, and wherein the second freewheel clutch comprises a blocking arm fixedly connected to the frame or housing and substantially abutting against the second circumferential toothed surface, w the blocking arm is adapted to slip over the teeth of the second circumferential toothed surface when the drive wheel is driven in the predetermined direction and to engage one or more teeth of the second circumferential toothed surface and to rotate the driven wheel if the drive wheel is driven in a direction opposite to the predetermined direction.

The driver of the drive wheel and the first circumferential toothed surface of the driven wheel thus form the first freewheel clutch that rotatably coupled the drive wheel to the driven wheel when the drive mechanism is driven in the predetermined direction, and which frees the drive mechanism provided relative to the driven wheel if the driving wheel is driven in a direction opposite to the predetermined direction. Thus, the one or more counting wheels are driven by the drive mechanism for adding a rotation of the drive mechanism in the predetermined device. If the driving mechanism is driven in a direction opposite to the predetermined direction, the freewheel is activated so that the one or more counting wheels are not driven.

To prevent the counting wheels from turning back and / or moving the counting wheels by vibrations, the counting device comprises a second freewheel device comprising a blocking arm which blocks a rotation of the driven wheel against the adding direction. Because the blocking arm abuts the second circumferential toothed surface of the driven wheel, the blocking arm also has a braking effect on a rotation of the driven wheel in the addition direction. This can essentially prevent the counting wheels from being moved in the addition direction by external factors, such as vibrations.

The combination of these measures ensures that the mechanical counter according to the invention is at least less sensitive to deviations in the counter position due to external factors on the one hand and a drive of the drive mechanism in a direction opposite to the predetermined direction on the other hand. As a result, the counter position of the mechanical counter according to the invention 35 provides a more correct representation of the added rotation in the predetermined direction.

In a second embodiment, the 6 driving wheel comprises a first circumferential toothed surface, the driven wheel being rotationally coupled to a carrier that substantially abuts the first circumferential toothed surface, the engaging member together with the first circumferential toothed surface running coupling and is adapted to engage one or more teeth of the first circumferential toothed surface when the driving wheel is driven in the predetermined direction and to slip over the teeth of the first circumferential toothed surface when the driving wheel is driven in a direction opposite to the predetermined direction, and wherein the driven wheel is rotationally coupled to a blocking arm that substantially abuts a second circumferential toothed surface fixedly connected to the frame or housing, the blocking arm together with the second circumferential toothed surface the second freewheel coupling and is adapted to slip over the teeth of the second circumferential toothed surface when the driving wheel is driven in the predetermined direction and to engage one or more teeth of the second circumferential toothed surface and to rotate the driven wheel if the drive wheel is driven in a direction opposite to the predetermined direction.

The mechanical counter according to this second embodiment forms the mechanical inversion of the mechanical counter following the first embodiment and as such has substantially the same operation and advantages, and is based on the same inventive concept.

It is noted that, in a further embodiment, the first freewheel coupling of the first embodiment can also be combined with the second freewheel coupling of the second embodiment, or that the first freewheel coupling of the second embodiment can also be combined with the second freewheel coupling of the first embodiment.

7

In an embodiment of the counter according to the first or the second embodiment, the driver is resiliently biased towards the first circumferential toothed surface and / or the blocking arm is resiliently biased towards the second circumferential toothed surface. By resiliently biasing the blocking arm, and in particular by adjusting or selecting an appropriate spring force, the braking action of the blocking arm can be optimized. In particular, it is desirable on the one hand that the braking action does not disturb the addition to a rotation of the drive mechanism in the predetermined direction, and on the other hand that the braking action prevents displacement of the counting wheels by external invoices, such as vibrations.

In a simple embodiment, the first and / or the second circumferential toothed surface comprise saw-tooth teeth. In an embodiment the teeth of the first and / or second circumferential toothed surface comprise an edge extending at least partly in circumferential direction, and on the trailing side a substantially radially extending edge, at least in the predetermined direction.

In one embodiment the carrier comprises at least one tooth which engages substantially form-fittingly on one or more teeth of the first circumferential toothed surface. In one embodiment the blocking arm comprises at least one tooth which engages substantially form-fittingly on one or more teeth of the second circumferential toothed surface.

In a simple embodiment, the first and second circumferential toothed surface are placed side by side in a direction substantially parallel to the axis. In one embodiment, the first and second circumferential toothed surface are formed as a whole.

To provide a compact mechanical counter, in one embodiment, the first and the second circumferential toothed surface are placed side by side in a direction substantially transverse to the axis. In an embodiment, the first and second circumferential toothed surface are disposed substantially concentrically about the axis. The length of the mechanical counter can hereby remain limited, at least in a direction parallel to the axis.

Furthermore, the number of parts of the counter according to the invention can be reduced if, in one embodiment, the driven wheel and the counter wheel with the least significant digit location are formed as one whole.

According to a second aspect, the invention provides a composite mechanical counter comprising two mechanical counters as described above, a first mechanical counter for indicating an addition of a rotation of a first drive mechanism in the predetermined direction and a second mechanical counter for indicating 15 of an addition of a rotation of a second drive mechanism in the predetermined direction, wherein the first and second drive mechanisms are coupled via a transmission, and wherein the transmission is arranged to drive the first and second drive mechanism in opposite directions.

If the first drive mechanism is driven in the predetermined direction, the counting wheels of the first mechanical counter are driven to add up the rotation of the first drive mechanism. The transmission simultaneously drives the second drive mechanism in a direction opposite to the predetermined direction, whereby the counting wheels of the second counter are blocked and therefore do not add up. If the first drive mechanism is driven in a direction opposite to the predetermined direction, the counting wheels of the first counter are blocked and will therefore not add up. The transmission simultaneously drives the second drive mechanism in the predetermined direction, and the counting wheels of the second mechanical counter are driven to add up the rotation of the second drive mechanism. As a result, the assembled mechanical counter is adapted to indicate an addition of a rotation of the first drive mechanism in the predetermined direction by the first counter, and to indicate an addition of a rotation of the first drive mechanism in a direction opposite to the predetermined direction by the second counter.

A substantially same operation can also be obtained with a composite mechanical counter according to a third aspect of the invention, which comprises two mechanical counters as described above, a first mechanical counter for indicating an addition of a rotation of a first driving mechanism in a predetermined first direction and a second mechanical counter 15 for indicating an addition of a rotation of a second drive mechanism in a predetermined second direction, the first direction being oppositely directed to the second direction, the first and second drive mechanism being a transmission are coupled, and wherein the transmission is adapted to drive the first and second drive mechanism in the same direction.

According to a fourth aspect, the invention provides a flow meter for measuring a gas or liquid flow, provided with a rotary shaft that is rotatably driven by the flow to be measured, for example with the aid of a paddle wheel or a rotary piston, the rotary shaft operatively coupled is with a drive mechanism of a mechanical counter or with a composite mechanical counter as described above.

The aspects and measures described in this description and claims of the application and / or shown in the drawings of this application can, where possible, also be applied separately from each other. Those individual aspects can be the subject of split-off patent applications directed at them. This applies in particular to the measures and aspects that are described per se in the subclaims.

10

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be elucidated on the basis of a number of exemplary embodiments shown in the accompanying drawings. Shown is:

Figure 1 shows a counter in accordance with the invention,

Figures 2A and 2B are a schematic side view of a drive of a counting wheel according to the invention,

Figures 3A and 3B are a schematic top view of a first exemplary embodiment of a drive according to the invention,

Figures 4A and 4B show a schematic top view of a second exemplary embodiment of a drive according to the invention,

Figures 5A and 5B are a schematic top view of a third exemplary embodiment of a drive according to the invention, Figures 6A and 6B are a schematic top view of a fourth exemplary embodiment of a drive according to the invention,

Figures 7A and 7B are a schematic top view in section of a fifth exemplary embodiment of a drive according to the invention,

Figures 8A and 8B show a schematic top view in section of a sixth exemplary embodiment of a drive according to the invention,

Figures 9A and 9B are a schematic top view in section of a seventh exemplary embodiment of a drive according to the invention,

Figures 10A and 10B are a schematic top sectional view of an eighth exemplary embodiment of a drive according to the invention, Figure 11 is a schematic side view of a ninth exemplary embodiment of a drive according to the invention, 11

Figures 12A and 12B are a schematic side view of a first exemplary embodiment of a drive for a composite mechanical counter according to the invention,

Figures 13A and 13B are a schematic side view of a second exemplary embodiment of a drive for a composite mechanical counter according to the invention, and

Figure 14 is a schematic view of a flow meter for measuring a gas or liquid flow, provided with a counter according to the invention.

10

DETAILED DESCRIPTION OF THE DRAWINGS

Figure 1 shows a composite mechanical counter 1 according to the invention, which is particularly suitable for use in a flow meter. The assembled counter 1 comprises two substantially the same counters 2, 3, each of which is designed separately as a counter according to the invention.

In the assembled mechanical counter 1, the first counter 2 and the second counter 3 are coupled by means of a drive mechanism to, for example, the rotor in a flow meter. The drive mechanism comprises gears 4, 4 'connected to a drivable gear 5, which is for instance coupled to the rotor in a flow meter. The transmission through the gear wheels 4, 4 'is chosen such that the second counter 3 is driven in the opposite direction to the first counter 2.

Each of the counters 2, 3 comprises a number of counters 6, 7, in this embodiment eight per counter. The counting wheels 6, 7 are mounted on a pivot axis 8 and are connected to each other with an intermittent transmission 9 known per se. The counting wheels 6, 7 are each provided with numbers '0' to '9' which are successively placed in front of a display window 110 (see Figure 14). When a counting wheel 7 moves from the '9' to the 12 '0', the position of the counting wheel 6 to the left of the counting wheel 7 is increased by one. The right-most counting wheel 7, which represents the least significant decimal, rotates gradually with a rotation speed that is proportional to the rotation speed of the drive mechanism. In this particular exemplary embodiment of the assembled mechanical counter 1 according to the invention, the rightmost counter wheel 7 of the first counter 2 rotates at a rotational speed that is proportional to the rotational speed of the drive mechanism in a first driven direction, and the rightmost counter works 7 of the second counter 3 with a rotational speed that is proportional to the rotational speed of the driving mechanism in a second driven direction that is opposite to the first driven direction. The following counting wheels 6, 15 on which the more significant decimal places are shown, rotate stepwise with an angle of 36 degrees in each case.

In each of the two mechanical counters 2, 3, the counting wheel 7 is connected with the least significant decimal to the gearwheel 4 ', 5 which drives the counting wheel 7, via a freewheel device according to the invention. The freewheel device securely couples the gearwheel 4'5 to the counting wheel 7 if the drive mechanism is driven in a predetermined direction, and provides a freewheel of the gearwheel 4 ', 5 relative to the counting wheel 7 if the drive mechanism is driven in a direction opposite to the predetermined direction. Thus, the counting wheels 6, 7 are driven by the drive mechanism for adding a rotation of the gear 4 ', 5 in the predetermined device. If the gear wheel 4 ', 5 is driven in a direction opposite to the predetermined direction, the freewheel is activated so that the one or more counting wheels 6, 7 are not driven.

Figures 2A, 2B schematically show an exemplary embodiment of a freewheel device 20 according to the invention. The freewheel device 20 comprises a driven wheel 21 which is coupled to, or integrally formed 13 on, the counting wheel 7 with the least significant digit location provided on the shaft 22. The driven wheel 21 is provided with a circumferential toothed surface 23 which forms the outer circumference of the driven wheel 21.

The teeth of the circumferential toothed surface 23 are substantially saw-tooth shaped. The teeth, viewed at least in the direction of rotation A, have a leading edge 23 'which extends largely in the circumferential direction of the driven wheel 21 and a trailing edge 23 "which extends substantially radially

The driven wheel 21 is connected by means of gear wheels 24, 26 to a drivable gear wheel 25. The gear wheel 26 is provided with a carrier 27 which is resiliently abutting against the circumferential toothed surface 23 of the driven wheel 21, the carrier 27 being connected to end is provided with a tooth 27 'which engages substantially form-fittingly on one of the teeth of the circumferential toothed surface 23.

With a drive of the drivable gear wheel 25 in a first direction A, as shown in figure 2A, the gear wheel 6 with the driver 27 will also be driven in first direction A, the tooth 21 'remaining in engagement with the driven wheel 21 and the driven wheel 21 thus carries and drives in the first direction A.

With a drive of the drivable gear wheel 25 in a second direction B opposite to the first direction A, as shown in Fig. 2B, the gear wheel 6 with the driver 27 will also be driven in second direction B, the tooth 21 'over the circumferential toothed surface 23 will slip and the driven wheel 21 will therefore not be carried and driven in the second direction B.

Furthermore, the freewheel counter according to this first exemplary embodiment comprises a blocking arm 28 which is connected to the frame or housing of the counter (schematically indicated by reference numeral 29) and which is spring-loaded against the surrounding toothed surface 23. The blocking arm 28 is on its end provided with a tooth 28 'which engages substantially form-fittingly on one of the teeth of the circumferential toothed surface 23, and is arranged such that the blocking arm 28 will block a rotation of the driven wheel 21 in the second direction B, such as shown in Figure 2B. If the driven wheel 21 is driven in the first direction A, as shown in Fig. 2A, the tooth 28 '10 will slip over the circumferential toothed surface 23 and a rotation of the driven wheel 21 is not blocked.

The freewheel device can be designed in various different ways, as indicated below with various exemplary embodiments.

Figures 3A and 3B show a schematic top view of a part of the drive mechanism according to a first exemplary embodiment. The driven wheel 31 herein comprises a circumferential toothed surface 33, 33 which forms the outer circumference of the driven wheel 31. A part of the circumferential toothed surface facing the gear wheel 36 (which corresponds to the gear 6 in Figs. 2A and 2B) thus forms a first circumferential toothed surface 33, and a part of the circumferential toothed surface remote from the gearwheel 36 a second circumferential toothed surface 33 '. As shown in Figures 3A and 3B, the first circumferential toothed surface 33 and the second circumferential toothed surface 33 'lie in axial direction, parallel to the axis 32, adjacent to each other. Also, the first circumferential toothed surface 33 and the second circumferential toothed surface 33 'are formed as one unit in this example.

Both the driven wheel 31 and the driving wheel 36 are placed on the shaft 32. The drive wheel 36 is provided with a carrier 37 which extends beyond the plane of the drive wheel 36 and which resists resiliently against the first circumferential toothed surface 33 of the driven wheel 31, the carrier 37 being provided at its end with a tooth which engages substantially form-fittingly on one of the teeth of the first circumferential toothed surface 33, as described above and shown in figures 2A and 2B.

Furthermore, the drive mechanism according to this first exemplary embodiment comprises a blocking arm 38 which is connected to the frame or housing of the counter (schematically indicated with reference numeral 39) and which resiliently abuts the second circumferential toothed surface 33 '. The blocking arm 38 is provided at its end with a tooth which engages substantially form-fittingly on one of the teeth of the second circumferential toothed surface 33 ', as described above and shown in figures 2A and 2B. Rotating the carrier 37, both a drive in the first direction A as shown in figure 3A and in the second direction B as shown in figure 3B, will not interfere with the fixedly arranged blocking arm 38, because the blocking arm 38 and the carrier 37 are spaced apart in the axial direction, parallel to the axis 32.

Figures 4A and 4B show a schematic top view of a part of the drive mechanism according to a second exemplary embodiment. This second exemplary embodiment differs from the first exemplary embodiment in that the drive mechanism is provided with a second blocking arm 38 'which is fixedly connected to the frame or the housing 39. In this exemplary embodiment, the positions where the first and the second blocking arm engage are on the second circumferential toothed surface located on substantially radially opposite sides of the driven wheel 31.

Figures 5A and 5B show a schematic top view of a part of the drive mechanism 35 according to a third exemplary embodiment. This third exemplary embodiment differs from the first exemplary embodiment in that the drive wheel 36 is provided with a first carrier 37 and with a second carrier 37 '. In this exemplary embodiment, the positions where the first and second catches engage on the first circumferential toothed surface are located on substantially radially opposite sides of the driven wheel 31.

Figures 6A and 6B show a schematic top view of a part of the drive mechanism according to a fourth exemplary embodiment, in which the second exemplary embodiment with two blocking arms 38, 38 'is combined with the third exemplary embodiment with two carriers 37, 37'.

Figures 7A and 7B show a schematic top view of a part of the drive mechanism 15 according to a fifth exemplary embodiment. The driven wheel 41 herein comprises two circumferential toothed surfaces 43, 43 'which are placed side by side and concentrically around the axis 42 in a direction transverse to the axis 42. The driven wheel 41 comprises a first edge 41 'which extends in the axial direction of the shaft 42. Furthermore, the driven wheel 41 comprises a second edge 41 "which extends in the axial direction of the shaft 42 and which is concentrically and spaced apart from the first edge 41 '.

The outer circumference of the first edge 41 'of the driven wheel 41 forms a first circumferential toothed surface 43, and the outer circumference of the second edge 41 "of the driven wheel 41 forms a second circumferential toothed surface 43',

Both the driven wheel 41 and the driving wheel 46 are placed on the shaft 42. The drive wheel 46 is provided with a carrier 47 which extends beyond the plane of the drive wheel 46 and which is resiliently abuts against the first circumferential toothed surface 43 of the driven wheel 41, the carrier 47 being provided at its end with a tooth which engages substantially form-fittingly on one of the teeth of the first circumferential toothed surface 43, as described above 17 and shown in figures 2A and 2B.

When driving the drive wheel 46 with the carrier 47 in a first direction A, as shown in Fig. 7A, the tooth will remain in engagement with the first circumferential toothed surface 43 and thus carry the driven wheel 41 and drive the counter in the first direction A.

With a drive of the drive wheel 46 with the carrier 47 in a second direction B, as shown in figure 7B, the tooth will slip over the circumferential toothed surface 43 and the driven wheel 41 will therefore not be taken along and the counter will not be taken. driven in the second direction B.

Furthermore, the drive mechanism according to this fifth exemplary embodiment comprises a blocking arm 48 which is connected to the frame or housing of the counter (schematically indicated with reference numeral 49) and which resiliently abuts the second circumferential toothed surface 43 '. The blocking arm 48 is provided at its end 20 with a tooth which engages substantially form-fittingly on one of the teeth of the second circumferential toothed surface 43 ', as described above and shown in figures 2A and 2B. The blocking arm 48 is arranged such that the blocking arm 48 will block a rotation of the driven wheel 41 in the second direction B, as shown in Fig. 7B. If the driven wheel 41 is driven in the first direction A, as shown in Fig. 7A, the tooth will slip over the second circumferential toothed surface 43 'and a rotation of the driven wheel 41 is not blocked.

Rotating the driver 47, both a drive in the first direction A as shown in Fig. 1A and in the second direction B as shown in Fig. 7B, will not interfere with the fixedly arranged blocking arm 48, because the blocking arm 48 and the driver 47 are spaced apart in the radial direction of the driven wheel 41.

18

Optionally, the drive mechanism according to the fifth exemplary embodiment can further be provided with a second carrier 47 'and / or with a second blocking arm 48' as schematically shown in figures 7A and 7B.

Figures 8A and 8B show a schematic top view of a part of the drive mechanism according to a sixth exemplary embodiment. This sixth exemplary embodiment differs from the fifth exemplary embodiment in that the first toothed surface 53 of the driven wheel 41 is formed on a side of the edge 41 'facing the axis 42 and that the drivers 57, 57' of the driving wheel 56 are in the space between the shaft 42 and the edge 41 'and are provided at their end with a tooth which substantially engages with one shape of the teeth of the first circumferential toothed surface 53. For correct operation, the carriers 57, 57' of this sixth exemplary embodiment prestressed in a radially outward direction. This is in contrast to the drivers 27, 37, 37 ', 47, 47' 20 in the earlier exemplary embodiments, which are biased in a radially inward direction.

Figures 9A and 9B show a schematic top view of a part of the drive mechanism according to a seventh exemplary embodiment. This seventh exemplary embodiment differs from the fifth exemplary embodiment in that the second toothed surface 53 'of the driven wheel 41 is formed on a side of the edge 41 "facing the axis 42 and that the blocking arms 58, 58' in the space between the shaft 42 and the edge 41 'extend and are provided at their end with a tooth which engages substantially form-fittingly on one of the teeth of the first circumferential toothed surface 53'. For a correct operation, the locking arms 58, 58 'of these seventh exemplary embodiment biased in a radially outward direction, in contrast to the blocking arms 28, 38, 38 ', 48, 48' in the earlier exemplary embodiments, which are biased in a radially inward-facing direction.

Figures 10A and 10B show a schematic top view of a part of the drive mechanism according to an eighth exemplary embodiment, wherein the sixth exemplary embodiment with the first toothed surface 53 of the driven wheel 41 is formed on a side of the edge 41 'facing the axis 42, is combined with the seventh exemplary embodiment in which the second toothed surface 53 'of the driven wheel 41 is formed on a side of the edge 41 "facing the shaft 42, as described in more detail above.

Figure 11 shows a ninth exemplary embodiment of a freewheel device 60 that forms a mechanical inversion of the exemplary embodiment shown in Figures 2A and 2B. The free-running device 60 comprises a driven wheel 61 which is coupled to, or is integrally formed with, the counting wheel 7 with the least significant digit location provided on the shaft 62. The driven wheel 61 is provided with a carrier 63 which resiliently abuts against a first circumferential toothed surface 67 of the gear wheel 66, wherein the carrier 63 is provided at its end with a tooth 63 'which engages substantially form-fittingly on one of the teeth of the circumferential toothed surface 67.

With a drive of the drivable gear 64 in a first direction A, as shown in Fig. 11, the gear 66 with the first circumferential toothed surface 67 will be driven in the opposite direction A '. Hereby the tooth 63 'of the carrier 63 will remain in engagement with the toothed surface 67, the driven wheel 61 is driven in the opposite direction A' (in this case this is the predetermined direction), and it will be driven with the driven wheel 61 coupled counter are driven.

With a drive of the drivable gear 64 in a second direction, opposite to the first direction A, the tooth 63 'of the driver 63 will slip over the toothed surface 67, the driven wheel 61 will not be carried along and it will driven wheel 61 coupled counter cannot be driven.

Furthermore, the freewheel counter according to this ninth exemplary embodiment comprises a blocking arm 64 connected to the driven wheel 61 and resiliently abutting a second circumferential toothed surface 68 which is fixedly connected or forms part of the frame or housing of the counter ( schematically indicated with reference numeral 69). The blocking arm 64 is provided at its end with a tooth 64 'which engages substantially form-fittingly on one of the teeth of the second circumferential toothed surface 68, and is arranged such that the blocking arm 64 rotates the driven wheel 61 in one direction opposite to the predetermined direction A '. If the driven wheel 61 is driven in the predetermined direction A ', as shown in Fig. 11, the tooth 64' will slip over the second circumferential toothed surface 68 and a rotation of the driven wheel 61 and a drive of the counter becomes. not blocked.

Figures 12A and 12B show a schematic side view of a first exemplary embodiment of a drive for a composite mechanical counter according to the invention, in accordance with the counter as shown in figure 1. The composite mechanical counter comprises two equal counters 201, 202 according to the counter as shown 2A and 2B and described in detail above.

With a drive of the drivable gear 251 in a first direction A, as shown in figure 12A, the gear 261 with driver 271 of the first counter 201 will also be driven in first direction A, whereby the tooth 271 'remains engaged. with the driven wheel 211 and the driven wheel 211 thus carrying and driving in the first direction A. The first counter 201 is thus driven to count.

21

On the other hand, the gear 262 of the second counter 202 will be driven in the direction B, opposite to A, the gear 62 with the carrier 272 also being driven in the second direction B, the tooth 272 'over the circumferential toothed surface. of the driven wheel 212 will slip and the driven wheel 212 will therefore not be carried along and driven in the second direction B. Also, the blocking arm 282, which is fixedly connected to the frame 292 and is provided with a tooth 282 at its end which engages substantially form-fittingly on one of the teeth of the circumferential toothed surface of the driven wheel 212, blocking a rotation of the driven wheel 212. The second counter 202 is thus not driven to count.

With a drive of the drivable gear 251 in a second direction B opposite to the first direction A, as shown in figure 12B, the gear 261 with the driver 271 of the first counter 201 will also be driven in the second direction B, wherein the tooth 271 'will slip over the circumferential toothed surface of the driven wheel 211 and the driven wheel 211 will therefore not be carried along and driven in the second direction B. Also, the blocking arm 281, which is fixedly connected to the frame 291 and to its end is provided with a tooth 281 'which engages substantially form-fittingly on one of the teeth of the circumferential toothed surface of the driven wheel 211, blocking a rotation of the driven wheel 211. The first counter 201 is thus not driven to count. In contrast, the gear 262 with driver 272 of the second counter 202 will be driven in first direction A, the tooth 212 'remaining in engagement with the driven wheel 212 and thus driving and driving the driven wheel 212 in the first direction A. second counter 202 is thus driven to count.

Figures 13A and 13B show a schematic side view of a second exemplary embodiment of a drive for a composite mechanical counter according to the invention, according to the counter as shown in figure 1. The composite mechanical counter comprises a first counter 201 corresponding to the counter as shown in 2A and 2B and described in detail above, and a second counter 203 with mirror-symmetrical components.

With a drive of the drivable gear 251 in a first direction A, as shown in Fig. 13A, the gear 261 with driver 271 of the first counter 201 will also be driven in first direction A, the tooth 271 'remaining in engagement with the driven wheel 211 and the driven wheel 211 thus carry and drive in the first direction A. The first counter 201 is thus driven to count. The gear 263 of the second counter 203 will also be driven in the direction A, the gear 263 with the driver 273 also being driven in the direction A, the tooth 213 'over the circumferential toothed surface of the driven wheel 213. will slip 20 and the driven wheel 213 will therefore not be carried along and driven in the direction A. The blocking arm 283, which is fixedly connected to the frame 293 and is provided at its end with a tooth 283 'which engages substantially form-fittingly on one of the teeth of the circumferential toothed surface of the driven wheel 213, block a rotation of the driven wheel 213. The second counter 203 is thus not driven to count.

With a drive of the drivable gear 251 in a second direction B, opposite to the first direction A, as shown in Fig. 13B, the gear 261 with the driver 271 of the first counter 201 will also be driven in the second direction B, wherein the tooth 271 'will slip over the circumferential toothed surface of the driven wheel 211 and the driven wheel 211 will therefore not be carried along and driven in the second direction B. Also, the blocking arm 281, which is fixedly connected to the frame 291, will and at its end is provided with a tooth 281 'which engages substantially form-fittingly on one of the teeth of the circumferential toothed surface of the driven wheel 211, blocking a rotation 5 of the driven wheel 211. The first counter 201 is thus not driven to count. The gear 263 with carrier 273 of the second counter 203 will also be driven in the second direction B, the tooth 213 'remaining in engagement with the driven wheel 213 and the driven wheel 213 thus taking along and driving in the second direction B. second counter 203 is thus driven to count.

Figure 14 shows a schematic view of a flow meter 100 for measuring a gas or liquid flow, provided with two counters according to the invention and a composite counter 101. The flow meter 100 comprises a tube part 102 in which a flow sensor is placed, e.g. known turbine rotor or a rotary piston which is drivable by a flow through the tube part 0 102, and which is coupled via a transmission to the composite counter 101. By means of the flanges 105, 105 'the flow meter 100 can be fed into a pipe being placed.

With a flow through the flow meter 100 in the direction A, the upper counter 103 will be driven to count the flow, while the lower counter 104 is blocked. With a flow through the flow meter 100 in the direction B, the lower counter 104 will be driven to count the flow, while the upper counter 103 is blocked.

Briefly summarized, the invention relates to a counter comprising a frame provided with counting wheels for indicating an addition of the rotation of a drive mechanism in a first direction, comprising a drive wheel and a driven wheel which is rotationally coupled to the counting wheels and via a first freewheel clutch is connected to the drive wheel, wherein the first freewheel clutch is adapted to rotatably couple the drive wheel and the driven wheel only when the drive wheel rotates in the predetermined direction, and wherein the driven wheel is connected via a second freewheel clutch with the frame or housing, wherein the second freewheel clutch is adapted to rotate-engage the driven wheel and the frame or housing only with rotation of the driven wheel in the direction opposite to the predetermined direction.

The above description is included to illustrate the operation of preferred embodiments of the invention, and not to limit the scope of the invention. Starting from the above explanation, many variations will be evident to those skilled in the art that fall within the spirit and scope of the present invention.

Claims (16)

  1. A mechanical counter comprising a frame or housing provided with a shaft on which one or more counting wheels are provided for indicating an addition of the rotation of a driving mechanism in a predetermined direction, wherein a counting wheel with the least significant digit location is coupled to a drive mechanism comprising: a drive wheel, a driven wheel which on the one hand is rotationally coupled to the counting wheel, and which on the other hand is connected to the drive wheel via a first freewheel clutch, the first freewheel clutch being adapted to rotate the drive wheel and the driven wheel a rotation of the drive wheel in the predetermined direction and to run free when the drive wheel is rotated in a direction opposite to the predetermined direction, and wherein the driven wheel is connected to the frame or the frame via a second freewheel clutch housing in which the second freewheel coupling is inserted Aim is to rotatably couple the driven wheel and the frame or housing with a rotation of the driven wheel in the direction opposite to the predetermined direction and to run freely with a rotation of the driven wheel in the predetermined direction.
  2. 2. A mechanical counter as claimed in claim 1, wherein the driven wheel comprises a first and a second circumferential toothed surface, wherein the driving wheel is rotationally coupled to a carrier that abuts substantially against the first circumferential toothed surface, the driver along with the first circumferential toothed surface forms the first freewheel clutch and is adapted to engage one or more teeth of the first circumferential toothed surface if the drive wheel is driven in the predetermined direction and to slip over the teeth of the first circumferential toothed surface if the drive wheel is driven in a direction opposite to the predetermined direction, and wherein the second freewheel clutch comprises a blocking arm fixedly connected to the frame or housing and substantially abutting the second circumferential toothed surface, the blocking arm being adapted to over the teeth of the second bypass slipping the toothed surface if the drive wheel is driven in the predetermined direction and to engage one or more teeth of the second circumferential toothed surface and to block a rotation of the driven wheel if the drive wheel is driven in a direction opposite 15 to the predetermined direction.
  3. 3. A mechanical counter as claimed in claim 1, wherein the driving wheel comprises a first circumferential toothed surface, the driven wheel being rotationally coupled to a carrier that substantially abuts the first circumferential toothed surface, the driver along with the first circumferential toothed surface forming the first frictional clutch and is adapted to engage one or more teeth of the first circumferential toothed surface when the driving wheel is driven in the predetermined direction and to slip over the teeth of the first circumferential toothed surface if the driving wheel is driven in a direction opposite to the predetermined direction, and wherein the driven wheel is rotationally coupled to a blocking arm that substantially abuts a second circumferential toothed surface fixedly connected to the frame or the housing, the blocking arm together with the second circumferential toothed surface is the tweed The freewheel clutch forms and is adapted to slip over the teeth of the second circumferential toothed surface when the drive wheel is driven in the predetermined direction and to engage one or more teeth of the second circumferential toothed surface and to rotate block the driven wheel if the driving wheel is driven in a direction opposite to the predetermined direction.
  4. A mechanical counter according to claim 2 or 3, wherein the driver is resiliently biased toward the first circumferential toothed surface and / or wherein the blocking arm is resiliently biased toward the second circumferential toothed surface.
  5. Mechanical counter according to claim 2, 3 or 4, wherein the first and / or the second circumferential toothed surface comprise saw-tooth teeth.
  6. 6. Mechanical counter as claimed in any of the claims 2-5, wherein the teeth of the first and / or second circumferential toothed surface comprise an edge extending at least partially in circumferential direction on the leading side, and a substantially radially extending on the trailing side edge, at least in the predetermined direction.
  7. Mechanical counter as claimed in any of the claims 2 0-6, wherein the driver comprises at least one tooth which engages substantially form-fittingly on one or more teeth of the first circumferential toothed surface.
  8. 8. Mechanical counter as claimed in any of the claims 2-7, wherein the blocking arm comprises at least one tooth which engages substantially form-fittingly on one or more teeth of the second circumferential toothed surface.
  9. 9. A mechanical counter as claimed in any one of claims 28, wherein the first and second circumferential toothed surface are placed side by side in a direction substantially parallel to the axis 30.
  10. The mechanical counter of claim 9, wherein the first and second circumferential toothed surface are formed as a whole.
  11. 11. A mechanical counter according to any one of claims 1-10, wherein the first and the second circumferential toothed surface are placed side by side in a direction substantially transversely of the axis.
  12. The mechanical counter of claim 11, wherein the first and second circumferential toothed surface are disposed substantially concentrically about the axis.
  13. A mechanical counter according to any one of the preceding claims, wherein the driven wheel and the counting wheel with the least significant digit location are formed as a whole.
  14. 14. Composite mechanical counter comprises two mechanical counters as claimed in any of the foregoing claims, a first mechanical counter for indicating an addition of a rotation of a first drive mechanism in the predetermined direction and a second mechanical counter for indicating an addition of a rotation of a second drive mechanism in the predetermined direction, the first and second drive mechanisms being coupled via a transmission, and wherein the transmission is adapted to drive the first and second drive mechanism in opposite directions.
  15. 15. Composite mechanical counter comprises two mechanical counters as described above, a first mechanical counter for indicating an addition of a rotation of a first drive mechanism in a predetermined first direction and a second mechanical counter for indicating an addition of a rotation of a second drive mechanism in a predetermined second direction, the first direction being oppositely directed to the second direction, the first and second drive mechanisms being coupled via a transmission, and wherein the transmission is arranged to move the first and second drive mechanism in to drive in the same direction.
  16. 16. Flow meter for measuring a gas or liquid flow, provided with a rotary shaft that is rotatably driven by the flow to be measured, for example with the aid of a paddle wheel or a rotary piston, the rotary shaft being operatively coupled to a drive mechanism of a mechanical counter according to one of claims 1 to 13, or with a composite mechanical counter according to claim 14 or 15. -oooooooo- BP / HZ
NL2008402A 2012-03-02 2012-03-02 Mechanical counter and flow meter provided with such counter. NL2008402C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL2008402 2012-03-02
NL2008402A NL2008402C2 (en) 2012-03-02 2012-03-02 Mechanical counter and flow meter provided with such counter.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2008402A NL2008402C2 (en) 2012-03-02 2012-03-02 Mechanical counter and flow meter provided with such counter.

Publications (1)

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NL2008402C2 true NL2008402C2 (en) 2013-09-03

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NL2008402A NL2008402C2 (en) 2012-03-02 2012-03-02 Mechanical counter and flow meter provided with such counter.

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR458087A (en) * 1913-05-20 1913-10-02 Louis Xavier Granoux Counter
GB697257A (en) * 1951-05-15 1953-09-16 English Numbering Machines Improvements in or relating to counting devices
US3131860A (en) * 1962-03-02 1964-05-05 Lowell E Mckean Single wheel count mechanism
US3561008A (en) * 1965-07-12 1971-02-02 Edgard Nazare Remote controlled illuminated displays
WO2008003759A2 (en) * 2006-07-06 2008-01-10 Glaxo Group Limited A counter and a recorder for a pill dispenser

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR458087A (en) * 1913-05-20 1913-10-02 Louis Xavier Granoux Counter
GB697257A (en) * 1951-05-15 1953-09-16 English Numbering Machines Improvements in or relating to counting devices
US3131860A (en) * 1962-03-02 1964-05-05 Lowell E Mckean Single wheel count mechanism
US3561008A (en) * 1965-07-12 1971-02-02 Edgard Nazare Remote controlled illuminated displays
WO2008003759A2 (en) * 2006-07-06 2008-01-10 Glaxo Group Limited A counter and a recorder for a pill dispenser

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