CA1067759A - Combined knob and position indicator - Google Patents

Abstract

ABSTRACT OF THE DISCLOSURE
The specification describes an adjustment indicator for use with a rotary spindle and includes a transparent hand-wheel adapted to be connected to the spindle and having a front face and an annular peripheral edge defining an interior chamber, an indicating dial rotatably mounted in the chamber and having a front face visible through the front face of the handwheel and a peripheral face visible through the peripheral edge of the handwheel, reading scales located on the front and peripheral faces of the indicating dial for viewing through the front face and peripheral edge of the handwheel and means for rotating the indicating dial in response to and as a function of rotation of the handwheel so as to provide an indication of the adjustment of the rotary spindle.

Description

_ ~ 1067~7~9 :
m e invention relates to an adjustment indicator for rotary spindles, and is particularly, but not exclusively con oe rned with an adjustment indicator for spindle-adjustable ~ehicle seats.
Khown adjustment indicators, which display optically the rev~lutions executed by rotary spindles, inv~lve oonsiderable e~penditure of resources on equipment and in assembly. ~hey operate by a pick-up of translatory adjusting ~Dvement which is proauced by the rotary spindle, and which is then tlauu3mitted electrically, mechanically or similarly to a separate indicator unit. This e~penditure is not justifiable in cases where an approximate indication of the actual positions of the ~o~ary spindle is ; suffic~ent, for exa~ple in adjusting elements operated by rotary spindles in machinery and in the fields of heating and sanitation.
m e invention is especially intended for vehicle seats having a vibratory support, in which the spring and da~ping characteristics of the vibration sysbem are adjustable according to the ~eight of the person occ~py-ing the seat by means of manually operable rotary spindles. An adJustment Lnd~cator fDr this purpose is known, for example, from Gernan Gebrauchsmuster no. 7 145 433. me translatory adjusting mouenent produced by the rotary spindle is transmitted by means of a cable to 8 æparate indicator unit which is mounted laterally on an upper frame of the æ at. However, the equisite oanstruction and assembly costs are hlah in relati~n to the i a!pproximate indication su~plied by this unit, and subsequent outfi~ting of existing seats with this adjustment indicator is not eoonomically viable.
~ n object of the invention is to create a sturdy, mechanically operable adjusbment indicator, particularly, but not exclusively, for use on spindle-adjustable ~ehicle æ ats, which adjustment indicators can be manufactured and . ':
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assembled at moderate cost and easily fitted to existing seats. As re~uired on vehicle seats, the adjustment indi-cator should be capable of being read both laterally from the entry to the vehicle, and from above by the person occupying the seat.
The present invention may be broadly described as an adjustment indicator for use with a rotary spindle com-pri.sing: an at least partially transparent handwheel adapted to be drivingly connected to a rotary spind].e, and having a front face and an annular peripheral edge defining a chamber;
an indicating dial means mounted with the chamber thereon having a front face visible through the front face of the handwheel and a peripheral face visible through the peripheral ~.
edge of the handwheel; reading scales located on the front and peripheral faces of the dial means for viewing through the front face and peripheral edge of the handwheel; and . means drivingly interconnecting the handwheel, and th~ dial . means for converting a plurality of revolutions of the hand-,, wheel to a maximum of one revolution of the dial means, the :.
interconnecting means including: a sun wheel; at least one planetary gear rotatably driven by the sun wheel for rotatably :.
driving the dial means; and a web rotatably mounting the at ~
least one planetary gear and having a pointer overlapping the .
dial means.
The feature of an integrated handwheel adjustment indicator allows, irrespective of the manner of control of the indicator device substantial savings to be made over earlier indicator devices independent of the handwheel, In particular, with an integrated handwheel adjustment indicator, a high degree of prefabrication can be achieved which makes ~ ~3~
cbr/J ..7 :-` 1067759 possible the requisite simple outfitting of existing seats.
The integrated handwheel adjustment indicator merely needs to be substituted for the standard handwheel operating the rotary spindle.
Tlle reading of the adjustment indicator can be substantially improved, if the handwheel is constructed with a transparent front and peripheral surface, and if an indi-cating dial is rotatably mounted coaxially in the handwheel, The indicating dial is appropriately provided with reading - 10 scales disposed on its front face and on a broadened peripheral edge thereof and is rotatable through 360 by means of a planetary gearing accommodated in the handwheel, or by means of a spindle drive. In this manner the reading scales can be read off laterally from the entry to the vehicle, and from above by the person occupying the seat, through the trans-parent front and peripheral surfaces of the handwheel.

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The embodiment of the handwheel adjustment indicator in which the planetary gearing is accommodated in the hollow hand-wheel for rotating the indicating dial is particularly sturdy.
Where planetary gearing is utilised, a fixed point of the planetary gearing may appropriately be provided by a web of the planetary gearing, which is mounted freely rotatably on the inner hub of the handwheel or on the rotary spindle and which is fitted with a pendulum weight. However, it is possible to take the fixed point from the gravitational field of the ~ 10 earth only in the case where the rotary spindles or handwheels ;
; are mounted substantially horizontally. Alternatively, the fixed point of the planetary gearing may be picked up by means of a holding device on a stationary bearing wall of the rotary spindle mounting. A sun wheel of the planetary gearing is preferably connected to the holding device and is mounted on the inner hub of the handwheel or on the rotary spindle, and the web !,, of the planetary gearing is provided by a housing of the hand-wheel. The rear wall of the handwheel is especially suitable for the purpose, as the front wall of the handwheel,should remain optically transparent for reading off the indicating dial. Where ;
; the sun wheel of the planetary gearing is fixed, special measures must be taken to mark the reading range of the scales on the . . ..
-; indicating dial. In an advant~g~ou5 embodiment of ~he invention, ~ this can be done by a buoyancy body which may be disposed in a - circular groove filled with fluid in the handwheel or indicating dial. Alternatively, however, the reading range of the scales on the indicating dial may be determined by a pendulum dial - mounted coaxially in the handwheel.
~ Another embodiment of the invention substantially simplifies i~ - 4 -~ bm/~

the marking of the reading range of the scales on the indicating dial. This embodiment provides for the web of the planetary gearing to be fixed by means of the holding device. In such a case, an extended end of the fixed web must preferably be .
designed as a pointer which overlaps the indicating dial. When the web is fixed vertically, the pointer will be clearly visible both from the front face and from above on the peripheral edge of the handwheel.

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In the embodiment of the invention which includes a fixed , .
10 web, the sun wheel of the planetary gearing may be defined directly by the rotary spindle. Generally, the rotary spindle ,~,. s~
is made of metal, and the individual elements of the planetary gearing are made of plastics. Therefore, the planet wheels can ,`,i be arranged to engage the rotary spindle frictionally whereby ",7 to produce a friction-wheel epicyclic gearing in a very simple manner.
If desired, the sun wheel may be defined by an interchange-able wheel pushed on to the rotary spindle. In such an embodi-ment, the ratio of the revolution of the indicating dial to the revolution of the rotary spindle may be adapted easily to the individual requirements of various applications. If a ... . .
; particularly large transformation ratio is desired, then, if .~ .
.~ planet pinions are used, the sun wheel may be provided with ~ discontinuous toothing. In an extreme case, it may be sufficient j to equip the sun wheel with one tooth or one pin or suchlike, ~,...
which, as the sun wheel executes a full revolution, turns the .;~ ~: .
~ adjoining planet pinion by one tooth division.
! In the case where the handwheel adjustment indicator utilises a spindle drive to control the indicating dial, the revolutions ~;~, '~' ' _ 5 _ ~ bm/~"~
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106775g of,the rotary spindle may be converted into a translatory axial movement by means of a spindle running nut locked against rotation, and the translatory axial movement may be retranslated into a 360 revolution of the indicating dial by way of a sleeve running in a sp~ral guide. ' ' , ~' Two important advantages are gained by this two-stage trans-lation of the revolutions of the rotary spindle. On the one hand, partically any maximum revolution of the rotary spindle can be retranslated into only one revolution of the indicating dial.
On the other, the two-stage transformation from a rotary move- ~' ment to a translatory movement, and vice versa, affords the possibility of bridging in a very simple way greater distances ~' from the actual thread of the rotary spindle to the handwheel ~ , adjustment indicator. This may be effected by running a connect-ing rod parallel to the rotary spindle, which passes on the trans-latory movement produced by the first transformation to the second transformation unit. Such a connecting rod also has the considerable advantage that it can easily bridge a housing wall or suchlike which exists, for example, to support a mounting of the rotary spindle between the actual spindle thread and the , ,, indicating handwheel. For this,purpose, the housing wall merely' needs to have a hole drilled in it at the appropriate pcint of the connecting-rod arrangement.
In order to avoid drilling through any housing wall, or to have a particularly short overall length of the total adjustment indicator for a rotary spindle, then, instead of the arrangement . .
of a spindle running nut on the a,ctual spindle thread, an ' arrangement of a spindle running nut on a simulator thread can , be used. The simulator thread may be provided at a suitable -b~/J,.,~
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. 10677S9 point on the rotary spindle: for example outside the mountings i-of the rotary spindle or in direct proximity to the spiral guide connected to the indicating dial. Although such a simulator thread requires the same number of turns as the actual spindle thread, the p~tches of the turns can be so chosen that the spindle ;
; running nut disposed on the simulator thread executes only a short ' translatory axial movement.
It is also very simple to adjust the indicating dial, for example to the outer left-hand or right-hand stop for the revolu-' 10 tions of the rotary spindle. For this purpose, the length of the - connecting rod connecting the spindle running nut to the sleeve on the spiral guide is preferably adjustable. It is also advantageous to adjust the indicating dial by turning it relatively to the spiral guide. The dispostion of a simple slipping clutch between spiral guide and indicating dial enables this to be aone ; easily. The latter embodiment is recommended particularly when the translatory axial movement is ~ot transmitted by a connecting rod, but by an outer protective tube which preferably encloses the spindle, the spindle running nut and the spiral guide with 1 20 the sleeve-moving in or on it.
1 It can be difficult for some users of a handwheel adjustment ~
indication according to the invention to reaa off the indicating dial in the way envisaged, i.e. always to recognise the scale value which points upwards as being the ~eading. To overcome ths '~ difficulty, an embodiment of the invention provides for the read-ing range of the scales applied to the front face and periphery of the indicating dial to be determined by a buoyancy body which is disposed in a circular groove filled with fluid in the hand-wheel or indicating dial. Such a buoyance body always points .
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upwards and can have a colour marking. It is also possible to determine the reading of the scales by a pendulum which is coaxially mounted and freely rotatable in or behind the hand-wheel. In addition, such a pendulum will always be in an optically fixed position, irrespective of the rotary position .
occupied by the handwheel or indica~Lng dial.
Various embodiments of the invention will now be described ::
by way of example with reference to the drawings in which:- .
Figure 1 is a longitudinal cross-section through a handwheel adjustment indicator according to the invention with planetary , . .
: gearing;

; Figure 2 is a cross-section through the handwheel adjustment ~; indicator shown in Figure 1 on the line 11 - 11 in Figure l;

; Figure 3 is a longitudinal cross-section through the hand-. wheel adjustment indicator having an alternative form of planetary .
., , gearing;

.` Figure 4 is a longitudinal cross-section through a handwheel i .
adjustment indicator having a spindle drive;

Figure 5 is a longitudinal cross-section through the middle ... . .
part of a spindle drive for rotary spindles which move axia}ly .

in proportion to their rotary movement;

. Pigure 6 is a top view of another handwheel adjustment ;- indicator according to the invention;

Figure 7 is a front view of the handwheel adjustment ... indicator shown in Figure 6; -The handwheel adjustment indicator shown in Figures 1 and

2 comprises a completely transparent handwheel 4 made, for . example, of acrylic glass or a:~uitable plastics, and an .. indicating dial 5 rotatably mounted coaxially inside the :
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handwheel. The indicating dial 5 has a scale 6 on its front face, and another scale 7 on its periphery. soth scales 6 and 7 are appropriately applied as transfer pictures, so that the scales can easily be adapted to individual applications.
The handwheel 4 is used to actuate a rotary spindle 8. The spindle 8 has a hexagonal head 9 which is secured to the hand-wheel 4 to prevent relative rotation of the handwheel 4 and ,.
rotary spindle 8. The front face of a hub 10 of the handwheel 4 is masked by a visual diaphragm 11 to which a company name 10 or other details may be applied. The rotary spindle 8 is - ;
connected by means of a split pin 12 to the hollow end of a main spindle 13 which extends through a fixed bearing wall 14 or mounted in it. The split pin 12 inhibits relative rotation of the spindles 8 and 13.
Planetary gearing is disposed in the handwheel 4 and a fixed point for the gearing is picked up from the bearing wall 14 by means of an end bush 15 which, in the embodiment shown, is bolted to the bearing wall at 16. The bush 15 could, if f desired, be glued or welded to the bearing wall. A plastics 20 tube 17 is set into the end bush 15. The clearance 18 between the tube 17 and bearing wall 14 is so chosen that after the tube ~- 17 has been pushed into the end bush 15 the split pin 12 is 7, accessible for the handwheel to be assembled. After the split pin 12 has been inserted, the plastics tube 17 is moved out of the ~9 end bush 15 and pushed onto the hub part of a web 19 of the planetary gearing. The ends of the tube 17 are joined to the ; end bush 15 and the web 19 by force fitting, although grub screws or pins could be provided as means to inhibit rotation.
- The web 19 of the planetary gearing has a fixed mounting bm/~

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~` 10677S9 and it is appropriately aligned vertically, so that the extension of its upper end also acts as a pointer 20 for the scales 6 and 7 on the indicating dial 5.
The indicating dial 5 is driven from planet wheels 21 of .: . , ~ .
the epicyclic gearing which are designed as combined gear and ~
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friction wheels. The frictional surface 22 interacts with the inner peripheral surface of the indicating dial 5 and turns ~ the latter around the handwheel hub 10. The indicating dial 5 ; is fixed in its axial position by bearing shoulders 23 of the 10 planet wheels 21 and by a circular supporting edge 24.
` The planet wheels 21 are driven via their toothing 25 by i means of a sun wheel 26 which is attached to the rotary spindle i 8 by force fitting and also acts as a spacer between the hand-l wheel hub 10 and the web 1~.
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In the embodiment of the rotary-spindle adjustment indicator l shown in Figures 1 and 2, the ratio of the revolutions of the .; .", . . ."
rotary spindlç to the revolution of the adjustment indicator can be changed in a simple manner. If a continuous movement of . the indicating dial 5 is preferred, the planet wheels 21 and ' 20 sun wheel 26 must be exchanged completely. In most cases, however, discontinuous adjustment of the indicating dial 5 is sufficient. In this case, when the transformation ratio is changed, it is necessary merely to exchange the sun wheel 26 which is formed around its periphery, depending on the ratio required, with separate teeth or cams which turn the planet wheels 21 by a tooth division. The sun wheel 26 then functions ;'i-as a timer and the planet wheels 21 are timed by it.

';¦ In the embodiment illustrated in Fi~ures l and 2, the open ~ rear end of the handwheel 4 is sealed by a cover 27 which is ; .i " , . --10-- .. :-':' bm/J,i~

~ ` 10677S9 clamped into the circular edge of the handwheel 4 and serves as protection when the handwheel is gripped during operation.
The embodiment shown in Figure 3 is deliberately designed very simply, in order to demonstrate how an integrated hand-wheel adjustment indicator can be manufactured easily at moderate cost. Apart from a handwheel 28, only five parts are necessary, namely, an indicating dial 29, a web 30, a retaining clip 31, a planet wheel 3Z and an intermediate ~heel 33. In some applications with smaller transformation ratios, the intermediate wheel 33 can usually be dispensed with. The indi~idual parts can be made of plastics at moderate cost by injection moulding. If desired, the retaining clip 31 can be designed as a wire clip.
The embodiment illustrated in Figure 3 shows a frict;on-wheel epicyclic gearing which operates with only a sing~e planet-wheel and intermediate-wheel combination. This means that a ¦ slight unilateral pressure on the indicating dial 29 or its " , l mounting on the rotary spindle cannot be avoided. However such .:1 ,1 . .
pressure will not cause disturbances in operation, as the ~¦ indicating dial 20 of plastics works directly on the rotary spindle 34 of metal, and radial bearing forces can be absorbed effectively. In the embodiment illustrated in Figure 1, however, it is recommended that opposing planet wheels 21 be used, so that the forces on the indicating dial S are balanced completely.
The handwheel adjustment indicator shown in Figure 4 ,1 l illustrates, on the left in the drawing, a spi~dle 35 with a . . .
spindle thread 36. The spindle 35 extends both sides of a houaing wall 37, as is the case, for example, in a vehicle seat with a ~ibratory support, where the spring and damping character-istics of the vibration system are adjustable as a function of .',.~ ~ -li-:i .
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~`- 10677S9 the weight of the person occupying the seat by means of the rotary .
spindle 35. Adjustment is carried out by means of a handwheel 38 which i$ secured by way of a knock-out pin 3.9 on the end of the rotary spindle 35, the latter being axially immovable. The :. aajusting members which act on the spring and damping elements ~ .
.~ of the seat, and are displaced axially on the spindle thread 36 when the spindle 35 is rotated, are not shown in Figure 4 as .
they are not necessary to the functioning of the handwheel adjustment indicator according to the invention.
It is merely necessary, for the function of the handwheel adjustment indicator, to convert the rotation of the spindle 35 into a translatory axial movement in any suitable way, for exam~e by means of a spindle running nut 42 threadedly engaging ; the spindle thread 36. This axial movement is then transmitted .
by a connecting rod 43 to a sleeve 44 which is guided on an outer 'l tube 45 pushed over the knock-out pin 39. The sleeve 44 engages l a spiral. guide 46 which is disposed on the outer casing of an .l outer tube 45. The sleeve 44 and the outer tube 45 with the spiral guide 46 represent a transmission unit whereby the . 20 translatory axial movement exerted on the sleeve 44 by the ,; ~ ,~¦~ connecting rod 43 is retranslated into a rotary movement of the ~;il outer sleeve 45. The step down in ratio is such that the outer :
~ t l sleeve 45 executes only one 360 revolution for the maximum :

.l axial movement of the spindle running nut 42. .

;.l In the embodiment illustrated in Figure 4, the outer sleeve .i.l 45 is connected rigidly to the indicating.dial 47 which is dis-` posed coaxially on the knock-out pin 39 or rotary spindle 35, : so that it is located inside a circular recess 48, open from : the rear, in the handwheel 38. The handwheel 38 consists of a ` bm/~,t~ -12-.

transparent material, for example acrylic glass. The structural unit of-the outer tube 45, the spiral guide 46 and the indicat-ing dial 47 is appropriately injection moulded as a single unit from a plastics material.
Figures 6 and 7 give a clearer visual impression of how the indicating dial 47 interacts with the transparent handwheel 38.
In Figure 7, the observer looks from the front through the ha~d-wheel 38 and sees the scale graduations 60 up to 130 which, in this embo~iment, indicate the weight in kilograms of a person occupying a vehicle seat. In Figure 6, the observer looks from above onto the peripheral edge of the handwheel 38, and likewise, sees the same scale which is applied to the broadened peripheral 4'f edge 49 of the indicating dial 47. Hence, the handwheel adjust-ment indicator according to the invention can be read easily from the front on entry to the driver's cab and also from above when the seat is being used.
If desired, the read-off can be made even easier, if the j reading range which mormally lies on the top of the scale for ~i recognition purposes is further identified by additional means.
In the embodiment shown in Figures ~ to 7 this is done by means of a circular groove 50 which is moulded into the rear side of the handwheel 38. The annular groove S0 is substantially filled with a fluid and then sealed by gluing on a back cover 51. The ' incomplete filling of the annular groove with fluid gives rise to an air bubble 52 which is very clearly visible, especially in ! slightly coloured fluids. This air bubble 52 is always in the .,1 uppermost position in any setting of the handwheel 38 and clearly ; reveals the reading range of the scale on the front face, and also that of the scale on the periphery, since the annular groove bm/~iy ~

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~` - 10677S9 50 is so disposed that it is easily recognisable in both reading directions, and does not overlap the scales.
Instead of the annular groove 50 being disposed in the hand-wheel 38, an annular groove or suchlike could, of course, be defined in the indicating dial 47. Alternatively, an enclosed -., . circular tube substantially filled with fluid could be glued from the rear to the indicating dial 47 in the upper corner edge between the scale on the periphery and the scale on the front face. In this way, the reading range of the scales would be clearly marked by the air bubble in the circular tube. Another possibility of identifying the reading range could be afforded in a simple manner by attaching coaxially in or directly behind the handwheel 38 a pendulum device which would always mark the upper reading range of the scales by means of an arrow or a ; . .. .
~l display window or suchlike. !, .
Assembly of the handwheel adjustment indicator according to the invention is very straightforward and it can be fitted to existing seats at moderate cost. On fitting the handwheel adjust-ment indicator to an existing vehicle seat, the old handwheel is 1 20 first removed by loosening the split pin 40. The next step is simply to drill through the housing wall 37 at 53 and then insert the connecting rod 43 (shown on the left-hand side in the Figure 4) in the hole 53. The connecting rod 43 is then welded directly to the adjusting member (not shown) disposed on the spindle thread 36 for the purpose of adjusting the spring and damping character-istics of the vibration system of the seat. The spindle running nut 42 shown in Figure 4 can then be abandoned. The finished unit, consisting of the knock-out pin 38 with the outer tube 45, sleeve 44 and indicator handwheel 38, 47, is then slipped onto .

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the end of the spindle 35 and locked again with the split pin 40.
The fitted handwheel adjustment indicator is immediately ready to operate, as the connecting rod 43 fixed in the hole 53 in the peripheral direction also acts as a guard against torsion for the sleeve 44 running in the spiral guide 46 and, if need be, also a guard against torsion for the ad~usting members or running nut 42 on the spindle thread. It is very simple to readjust the .,.~, - .
adjustment indicator according to the invention. For readjust-ment purposes, the sleeve 44 running in the spiral guide 46 can be displaced axially after a grub screw 54 has been loosened, as a result of which the indicating dial 47 will move into the corresponding position for readjustment. The grub screw 54 is then retightened. Figure 6 shows another possibility for read-justing:the adjustment indicator. It is noticeable here that the outer tube 55 is not connected in one piece to the hub 56 of .... . .
the indicating dial. In fact, the hub 56 can be turned to read-just the indicating dial when a sufficiently large force is applied to the outer tube 55.
Whereas the embodiment illustrated in Figure 4 shows a hand-wheel adjustment indicator, for use with rotary spindles which , do not move axially, Figure 5 shows an embodiment of the invention for rotary spindles which move axially in proportion to their revolutions in relation to a housing wall 57. In such a case, the translatory axial movement can be picked up directly on the ; housing wall 57 in which a connecting rod 58 is inserted. The connecting rod 58 has a cranked end 59 which ~ocates in a sleeve 60. The sleeve 60 has the same function as the sleeve 44 in Figure 4. In the embodiment illustrated in Figure S, the ~ adjustment indicator is readjusted by operating a slipping clutch j ~ disposed between the outer tube and indicating dial (Figure 6).
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Claims (11)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. An adjustment indicator for use with a rotary spindle comprising:
an at least partially transparent handwheel adapted to be drivingly connected to a rotary spindle and having a front face and an annular peripheral edge defining a chamber;
an indicating dial means mounted within said chamber for rotation therein having a front face visible through said front face of said handwheel and a peripheral face visible through said peripheral edge of said handwheel;
reading scales located on said front and peripheral faces of said dial means for viewing through said front face and peripheral edge of said handwheel; and means drivingly interconnecting said handwheel and said dial means for converting a plurality of revolutions of said handwheel to a maximum of one revolution of said dial means, said interconnecting means including:
a sun wheel;
at least one planetary gear rotatably driven by said sun wheel for rotatably driving said dial means; and a web rotatably mounting said at least one planetary gear and having a pointer overlapping said dial means,

2. An adjustment indicator as claimed in claim 1, said sun wheel being formed with discontinuous toothing.

3. An adjustment indicator as claimed in claim 2, said sun wheel being connected directly to a rotary spindle.

4, An adjustment indicator, as in claim 1, wherein the sun wheel is defined by an interchangeable wheel press fitted on a rotary spindle,

5. Indicator as in claim 1, wherein the web is secured to a holding device mounted on a stationary bearing wall of a rotary spindle mounting.

6. Indicator as in claim 1, wherein the web is secured to a holding device which is provided by an outer tube which encases the rotary spindle.

7. An adjustment indicator, as in claim 1, wherein the handwheel is provided with a back protective cover,

8, An adjustment indicator as in claim 1, said sun wheel being an inner hub of said handwheel.

9. An adjustment indicator as in claim 1, wherein said sun wheel is a rotary spindle connected to said handwheel.

10. An adjustment indicator as in claim 1, wherein the reading range of the scales on the indicating dial is deter-mined by a buoyancy body which is disposed in a circular groove filled with fluid in the handwheel or the indicating dial.

11. An adjustment indicator, as in claim 1, wherein the reading range of the scales on the indicating dial is deter-mined by a pendulum dial mounted coaxially in the handwheel.