SK7293A3 - Crank device - Google Patents

Abstract

The crank device has a part (2), which can be rotated about an axis, and a crank part (1), the two parts being connected to one another by engagement similar to that in a bayonet catch. Two eccentrics (7, 10) are rotatably mounted in the crank part (1). Each eccentric has a pin (8, 11) eccentric to its axis of rotation, each pin engaging in an associated slot (9, 12) in the rotatable part (2). The crank part (1) can be adjusted relative to the rotatable part (2) by rotating the two eccentrics, it being possible to adjust both the angular position of the crank part and its radial position relative to the axis of rotation of the device. This enables adjustment of the angular position and of the lift of a pin (4) connected to the crank part (1). <IMAGE>

Description

The invention relates to a crank device having a part rotatable about an axis, at least one crank part connected to a rotatable part and a first eccentric for adjusting both parts relative to each other, the first eccentric being rotatably connected with one of both parts and the first pin eccentrically arranged relative to its which fits into the first groove of the second of the two parts.

The part rotatable about the axis may be a shaft. It may also be a second crank part. The last case is e.g. at. gears for dry gas meters. Here, one crank piece is connected to the movable walls of the computer chamber, while the other crank piece controls the sliders associated with the computer chamber.

The species mentioned in the introduction is known from. DE-OS 36 23 596. The crank piece is mounted coaxially on the rotatable part and can be adjusted with the eccentric in the circumferential direction in order to adjust the angular position of the two parts relative to one another. The basic use of this design is in dry gas meter transmissions, where the adjustment serves to set the slide valves in advance of the movable walls of the chambers? computers. In this way, the computer adjusts the lacquer so that the measurement error over the entire measuring range, i.e. irrespective of the quantity conveyed, remains substantially constant.

To this extent, the known device has proved to be successful. However, the adjustability is limited to the circumferential direction.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a device of the above-mentioned type which permits a relative relative displacement of the two further steps.

To solve this problem, the crank device according to the invention is characterized by a second eccentric, for the relative relative displacement of the two parts, wherein the second eccentric k is also rotatably connected to one of the two parts and the other eccentric pin arranged to its pivot axis. from both guns.

When the adjustment is made by lowering one of the eccentrics, the other eccentric creates a center of rotation for the relative movement of the two parts. The corresponding operation of the two eccentrics can be carried out not only - as before - in the circumferential direction, but also in the adjustment of the relative angular position, even the crank part in relation to the axis of the rotational direction. This means that the crank stroke is adjustable. Each u does separately.

It is also possible to overlap the adjustment positions in which simultaneously the angular position and the stroke are changed.

The adjustment can be greatly nod uc h o. T j. The device operates with the casing and the casing has 1 elements, so that it is easily retained in construction and assembly.

Fineness adjustment by each eccentric: the axis extends from the pin to the rotary axis of the eccentric.

By selecting this size appropriately, the desired fineness can be adjusted, although individually for each of the two editors.

The basic application of the invention lies in the field of dry gas meters.

Changing the circumferential direction as above is cleared

P reds t. The slide adjusts the movement of the computer chambers to keep the errors in the measuring range constant.

c hy would be. The earthing adjustment and calibration has hitherto been followed by the drive of the computer, the design of which has been adjusted by incorporating various gearwheel adjusting sets. This allowed a setting in the range of + 7-5 Deviations beyond this range in the content led to misfires.

With the adjustment of the crank radius according to the invention, the stroke of the movable walls of the computer chamber and hence the computer content can be varied to substantially greater than +/- 5%, so that rejection production is prevented due to content variations. Setting is not only exact, but at most _a simple, and in any case can not be compared with the cost, which would require a set of gears. Also, the adjustment can be automated. Further, the possibility to allow larger component tolerances is provided. This is particularly important in mechanical temperature-compensating computers, since compensating elements, which are predominantly bimetals, generally have high tolerances.

The force transmission between the rotary part and the crank part takes place via both eccentrics. As their pins cooperate with the grooves, the arrangement shall be such that the load during operation cannot cause any undesired adjustments. This may happen to some extent by aligning and aligning the two grooves. On the other hand, one of the two parts carries a third pin which fits into a third groove other than the two parts, the third groove limiting the displacement of one work relative to the other. . This avoids undesired adjusting movements, with the result that it is advantageous to form a third groove corresponding to the desired adjusting characteristic. Especially preferred is the requirement that the third groove is arranged approximately midway between the two eccentrics and approximately vertically to the imaginary line that extends through the two eccentrics.

In a further invention, the first groove with the second groove lies approximately on a common line. This is not only advantageous from a manufacturing point of view, but also allows a favorable movement of the adjustment. of the rotary work, since here the adjustment of the angular position itself is caused by the lowering of the second eccentric.

A preferred embodiment of the invention is characterized in that the crank piece is provided with a sensing element and in that the sensing element has both eccentrics. it defines an approximately rectangular triangle, with a hinge between it. Here, the two adjustment movements of the sensor element are essentially vertical relative to one another. When the eccentric is aligned with the rotating part, the adjustment of this eccentric leads to a practically radial adjusting movement of the lightning element.

The device according to the invention is particularly suitable for compensating for thermal changes, and is equipped with a temperature compensation device which is effective between the sensing element and the crank piece. The temperature compensation device may comprise e.g. a bimetallic band bent into a U-shape which is fixed at one end to the crank part and carries a sensor element at its other end. Advantageously, the temperature compensation device is provided with a swivel arm which is connected to the crank part and carries a sensing element, wherein the bimetallic element mounted on the crank part engages in the swivel arm and is essentially adjusted radially to the axis of the swivel part. it is particularly suitable that the bimetallic element is made in a spiral shape and fits substantially one radially with respect to the axis of its spiral in the swivel arm. This design offers, among other things, the advantage of simple sensitivity adjustment and that the spiral bimetallic element is adjustable

11) 0 r <

in its protruding end, it changes the length of the bimetallic beer considered to be a lever in relation to the pivoting.

arm.

This is

In a further invention, the crank part and the rotary part have 1 engagement elements to achieve bayonet locking.

This allows for convenient mounting of simple &quot; sliding &quot; both parts. It is particularly advantageous here that one of the two parts protrudes radially above the other and has radially inwardly directed projections which are engaged by the surface area of the second part while

The common range in the common direction always engages the through hole for overhang of the projection. Surface ranges allow arbitrary two-dimensional movements in their plane_

For design reasons, it has been proven

Extremely simple production is achieved by the fact that the two eccentrics are arranged together in one of the two parts of the handle of the metal. Each eccentric bears above all a control made as a radial pointer which is flexibly adjustable by the scale of the work rotary joint The indicator allows the setting of the eccentric to be set in addition to the scale of the relevant eccentric.

As the invention shows

P1 and L i. a a j L a k com b i. n i c i. The invention is characterized in that it is a prior art that:> a.

The invention is explained in more detail below on the basis of embodiments and in more detail. with the drawing. The drawing shows ua:

Fig. 1 is a basic plan view of a crank device according to the invention;

Fig. 2 shows a cross-section along line II-II in FIG. 1;

Fig. 3 is a schematic representation of the movement ratio

The crank device according to the example shows the crank piece .1. as well as the rotary part 2 connected thereto. The last part is connected in one piece to the shaft 3. The crank part 1 carries a sensor element 4 in the form of a pin, which in this case is connected to the movable walls of the dry gas meter computer chamber. The shaft 3 is used to transmit this movement to both the computer chamber slider and the computer. Here the shaft 3 can carry another crank piece. The pivot part 2 can also have a crank pin on its side.

The parts 1 and 2 are made in the form of a disc and are connected to each other by a bayonet closure. The crank part 1 protrudes radially over the pivot part 2 and has projections 5 directed radially inwards that engage the respective planar ranges of the pivot part 2. The through holes 6 in the pivot part 2 allow the bayonet closure to be inserted. This closure permits, to a limited extent, two dimensional relative movements between parts 1 and 21

The device has a first eccentric 7 which is pivotally connected to the crank piece 1 and bears its eccentric arranged first pin 8 in its pivot axis. This fits into the first groove 9 of the rotary part 2. It further protrudes from the second eccentric k 10, which is also pivotally connected to the crank The second pin 11 fits into the second groove 12 of the rotary part 2. In addition, the crank part 1 carries a third pin 13 which engages the third groove 14 of the rotary part 2. In this case, arrangement so that both eccentrics 7a define together with the sensing element

4. Right Angle - The grooves a 12 lie on a common line that connects the two middles.

A third groove extends at right angles to this line between the two eccentrics

14- The two eccentrics are mounted rotatable in one and the same part, the eccentric k .10 being aligned with the axis of the rotating part.

The movement ratio of this arrangement is best seen in FIG. 3. The third groove 14 of the rotary part 2, in which the third pin 13 of the crank part 1 fits, defines the characteristic of the relative movement between the parts 1 and 2. When the first eccentric 7 is lowered, the second eccentric pin 10 forms the center of relative movement. The sensor element 4 thus performs the movement indicated by the double arrow A in FIG. 3. In relation to the axis of rotation of the shaft 3 there is practically pure circumferential movement so that the angular position of the sensor element 4 of the respective rotary part 2 is adjusted. On the other hand, when the second eccentric 10 is lowered, the pin 8 of the first eccentric 7 serves as the center of rotation. The movement of the sensor element 4 resulting therefrom is shown in FIG. 3 is indicated by a double arrow B. In relation to the axis of rotation of the shaft 3, this is practically pure radial movement, thereby adjusting the crank stroke of the sensing element 4 corresponding to the rotary axis of the crank device.

By adjusting the angular position, i.e. lowering the first eccentric 7, the advance of the dry gas meter slide relative to the movable walls of the computer chamber is adjusted, resulting in a corresponding extension of the error curve. Adjustment of the second eccentric 10 will compensate for a possible content error due to a change in the lift of the movable walls; The computer is set up. the error curve is drawn to the zero line. Overlap of both set movements is possible without further.

For manual adjustment, the first eccentric 7 is provided with an actuator 15. Likewise, the second eccentric 1.0 is provided with an actuator 16. The actuators 15 and .16 are made as pointers and cooperate with the associated scale 17 or 16, respectively. 18 to allow visual inspection of the current setting. In this case, an elastic engagement between the pointer and the scale (protrusions / dips) is possible in order to intensify the self-braking action of the eccentrics.

Within the scope of the invention, the possibilities of variation are generally mentioned. Here, the rotary part 2 can be connected to another crank part, the relative adjustability in the circumferential direction and / or the radial direction being also determined. Furthermore, the spatial arrangement of the two eccentrics can be varied with respect to each other

and relative to the sensing element. it some pays for the first and second Groove- According to the circumstances is a possible give up with the third groove with pin attached. Both eccentrics can a flat without further Sieh stored in swivel

The associated groove is located in the crank part. There is also the possibility of storing one eccentric in the rotary work and the other in the crank work. In any case, the assignment of the third pin 13 and the third groove 14 to the two parts 1 and 2 can be freely selected. As already mentioned, the form of the third groove 14 determines the displaceability characteristics of the device. It can thus adapt to an existing i; uii.

With respect to the blocking between the crank part 1 and the pivot part 2, it is possible to envisage embodiments which differ from the bayonet-type construction, provided that both parts are at least two-dimensionally displaceable relative to one another in each direction. Blocking is possible with both eccentrics. Actuators 1.5 and 16 may be limited to their signaling function when the adjustment is made by other means, e.g. automatic central grip of the tool.

The drawing does not show an illustration of the temperature compensation device according to the invention in which the sensor element 4 sits on a pivot arm mounted on a crank piece which is so spiraled by its spiral bimetallic element that the sensor element moves substantially radially to the axis of the rotary part 2-

Claims (15)

Crank device having a part (2) rotatable about an axis, with at least one pivot part connected to the crank part (1) and a first eccentric (7) for relative relative displacement of the two parts, the first eccentric being pivotally connected to one of the two parts and having a first pivot (8) arranged eccentrically to its pivot axis, which fits into the first groove (9) of the second part, is characterized by a second eccentric (10) for adjusting the two parts relative to each other, the second eccentric being rotatably connected to one from both parts and to the axis of rotation eccentric by an arranged second pin (11), which fits into the second groove (12) of another of the two parts Crank device according to claim 1, characterized in that one of the two parts (1,2) carries a third pin (13) which fits into the third groove (14) of the other one, the third groove restricting the displacement of one part relative to the druhému- Crank device according to claim 2, characterized in that the third groove (14) is shaped according to the desired adjustment characteristic. The crank device according to claim 2 or 3, characterized in that the third groove (14) is located approximately in the middle between the two eccentrics (7, 10) and approximately vertically to the imaginary, connecting straight that extends. both. eccentric km i - 5. Crank device according to one ' s. Claims 1 to 4, characterized in that the first groove (9) with the second groove (1.2) lies approximately in the same line. Crank device according to one of Claims 1 to 5, characterized in that one of the two eccentrics (7, 10) is located approximately centrally to the axis of the rotatable part (2). Crank device according to one of Claims 1 to 6, characterized in that the crank piece (1) is provided with a sensor element (4) and that the sensor element with both radiuses (7, 1.0) defines an approximately rectangular triangle, lying between j eho odves nam i. Crank device according to claim 7, characterized by a temperature compensation device which is effective between the sensing element (4) and the crank piece (1). Crank device according to claim 8, characterized in that the temperature compensation device has a swivel arm which is mounted on the crank part (1) and carries a sensor element (4), wherein the metal-metal element fastened to the crank part on the swivel arm engages and this is set radially to the axis of the rotary workpiece (2). . Crank device according to claim 9, characterized in that the bimetallic element is made spiral and engages on a pivoting arm with a projecting end substantially radial to its spiral axis. Crank device according to claim 10, characterized in that the helical bimetal element is adjustable in the direction of its overhang end relative to the pivot arm. Crank device according to one of claims 1. to 11. characterized in that the crank part (1) and the pivot part (2) have engagement elements for producing a bayonet closure. Crank device according to claim 12, characterized in that one of the two parts (1, 2) protrudes radially over the other and has radially inwardly extending projections (5), which are partially engaged with both the associated and surface ranges of the other, one through-hole (<€ '») p.rr is connected to the surface ranges in the common circumferential direction. Crank device according to one of Claims 1 to 13, characterized in that the two parts (1, 2) are disc-shaped. Crank device according to one of Claims 1 to 14, characterized in that each nozzle (7, 10) carries one actuator (15, 16) configured as a radial indicator which is elastically adjustable with the scale (17, 18) of the work (1 or 2) with which it engages with which the eccentric is pivotally connected.