DE1808316B2 - CRANK WITH VARIABLE ECCENTRICITY - Google Patents

Description

18 03

»Shares that unintentional adjustment cannot occur.

According to the invention, it can also be useful that the gear shaft is open towards the gear Has bore in which a coil spring and a pin are mounted, which pin with his the Spring facing away from the end against a surface on the part provided with the rack surfaces to a? Bring bias of the spring. on In this way, the necessary preload is achieved by means of simple construction.

Finally, it can be advantageous according to the invention that one part has a right-angled cross-section Has a U-shape and is provided with a recess near the outer ends of the legs of this U. is which recesses form a guide for the other part, which is the shape of a plate piece possesses, whereby a simple robust construction of the whole is achieved.

The invention is explained in more detail below with reference to the drawing. It shows

F i g. 1 an embodiment of the crank according to the invention seen in longitudinal section,

F i g. 2 shows a section along line 11-11 in FIG. 1 and F i g. 3 shows a section along the line HI-HI in FIG. 1.

The crank shown consists of two parts 1 and 2, of which the first the crank journal 3 and the others carry the crank pin 4, but the latter in the embodiment shown is not the actual one Crank pin, rather than a cam with an internally threaded bore 4 ', with the help of which the cam can be connected by a screw connection to the part with the HiKe of the crank should be moved. The crank pin can, however, have any design, which is why this name is used is intended as a general term, in no way applied to the in each individual case Training aims.

The part 2 has, as can be seen from Fig. 2, in large and whole U-shaped cross-section and at the lower ends of the legs of the U is one each Recess 6 designed to form a guide for part 1, which has a plate shape, and this Recesses fits into it so that it can be moved therein with respect to part 2.

The shaft 3 is hollow and a shaft 7, which carries a gear 5, is mounted in this shaft.

Inside on the side walls of the part 2, rack surfaces 3 and 10 are formed, both of which are in engagement with the gear 5. Because of this double engagement, the parts 1 and 2 excluded relative to each other.

The gear 5 can, however, be moved in the axial direction, since the shaft 7 is both displaceable as is also rotatably mounted in the shaft 3.

In order to prevent unintentional displacement, there is a helical spring in a bore 11 in the shaft 7 12 and a pin 13 attached, which pin by its abutment against the upper part of part 2, the spring 12 is a little bit compressed.

The outwardly facing end of the shaft 7 is provided with a notch 8 through the hollow shaft 3 mn Can be accessed using a screwdriver. Press on the while 7 with a screwdriver or another tool, the spring 12 can also be compressed, so that the Gear 5 is moved in the axial direction.

As shown in FIG. 2 shows, the rack surface 9 is much wider than the rack surface 10, so that the gear 5 retains its engagement with the rack surface 9 during the aforementioned displacement, from the rack surface 10, however, comes free. This releases the lock and that Gear 5 can be rotated with the help of the screwdriver and due to its engagement with the Toothed rack surface 9, such a rotation of the gearwheel leads to a displacement of the two parts 1 and 2 relative to each other with itself.

When the desired position of these two parts in relation to one another is achieved, the screwdriver is used withdrawn and the spring 12 leads the gear in the axial direction back into engagement with the Rack surface 10, creating the new setting as a result of the meshing of the gear with both Rack surfaces is secured.

The construction shown can be changed in various ways, e.g. B. in that instead of a hollow Shaft used a massive shaft and at the same time a separate storage of the shaft of the gear 5 in the Part 1 is provided.

1 sheet of drawings

Claims (1)

1803 316 ι In another known construction (CH-PS ? 33 432), the set stroke is determined Patent claims: even more complex work process, as it is specially designed for this ... j "ora #.". hene fastening screws loosened by hand 1. · Crank with .variable eccentricity, whose ^{value of the stroke to the crank arm set before} * ^eS _n ^e " ^e ?" ° _by J _6n must be displaceable relative to one another in order to aen ei _B Its parts (1 and 2) consist, each of which has a wave ^v % ^a "r ™ · _and technology also has one or wear a shaft journal, namely the ^! ,, nordnune (GB-PS 2 33 742). which in itself are not Contains the crank bearing journal (3) or the crank journal (4) *% ** 2Z $ S £ $ £ of the set stroke as a result η η ζ calibrated η e t. that the one part means for "J" J _in ^B connection with the (I) a longitudinally displaceable shaft (J "ο ™ Jj ^ e3taSS3Snenten requires the _ZU r Has. which carries a gearwheel (5), which are engaged by «g ^^ tenA . The operation too with two parallel toothed racks facing each other ^h '" ^S *' ^1Un £ ° j _e2e | unRen requires a manual one gen faces (9 and 10) on the other part (2), such locks of which the one (9) in the axial direction of the ^Ar ^ ^tSV , ° _e ^r _i ^ga g _finding underlying task Gear (5) is wider than the other (Kty and that 15 D «der ^trt ' ^naun &«> _d described at the beginning the gearwheel (5) is against ie the action of a spring ^ now d «J ^^ STSnstellungts (12), n Axialnchtung «, move a position let ^ Ji'JSS ^ nmg to the set value in which it is only in engagement with one (9) hub ais auicn ui e _d separate of the two rack surfaces are located on and 10J. on «[^ JJ ^ ^ playL · a ^ ring 2. Crank according to claim 1. characterized marked 20 Festste lungselemenie.oci "J ¹ ..... net. that the shaft (7) of the gearwheel (5) is rotatable and enables, wobe ^ ^{ne au} ^ ^ro ^ ^entl '^ slidable in the shaft (3) of the associated part automatte fastening of the hood without ^ j (1) which is hollow. stored and in their outward activity ^special ^ f "^^ ^{ht WCrden SOh} turned end with a notch (8) or a ^^^ ÄlSSS A ^ depending on this other appropriate device is provided, 25 trtindungsgemdo wi u ζ verschiebhire the one with a piece of tool through the hollow that one Ted a y "^ f ™ £ ™ ^ m F, n _S r ff Welleί3Λ zueänslich is ^{while has} · ^{which gear wheel tra} g ¹ · ^{the su} : ⁿ ' ^{m tin} g ^rit ' Külbel nth "claim 1 or 2. thereby mU /« ip. ™ itelen.em. ^ marked that the gear shaft (7) one to the surface on the other part ^^ ™ - * ™ ^ «% £ Gear (5) has an open hole (11), in the axis direction of the **? «£ ***** £ W _r kun _K a ^ a coil spring (12) and a pin (13) and that the gear against the action of a are attached, which pin (13) with its spring in the axial direction in ei «Sw, Hung move Mu Spring (12) facing away from the end against a surface on which it s.ch only in engagement with one of the be.dtn the part (2) provided with the rack surfaces is the rack surfaces. ·, 1 r- j / <- »\ u / onn tir-h Hn * 7ahnrad in the ride with aen Deiaen an egt to bias the spring 12) 35 If sicn aas ^ .annrau 111 _{e nrphpn} . To bring about rack surfaces is a turning of the 4. Crank according to claim 1. 2 or 3, thereby excluding the gear and the> both parts are characterized in that one part (2) is therefore locked relative to one another in cross section. If the gearwheel has a right-angled U-shape and is displaced in the vicinity of the Axialnchtung so that it is only provided with one of the two rack-flat recess (6) _{m the outer ends of the leg of this U.} . which recess is located, it can be rotated and due to its gene (6) form a opening for the other part (1). Engaging with this one rack surface we which has the shape of a plate piece. when turning the gear the two Te Ie relative shifted to each other. When the gear is released in the new position, the spring will release it pushed back into the position in which it is with both rack surfaces is in engagement, and the The invention relates to a crank with variable two parts are thus automatic and without eccentricity, the crank arm of two relatively some special manual Arbe.tsvorgang on mutually displaceable parts, which each locks 50 new parts relative to each other
carry a shaft or a shaft journal, according to the invention it may be useful that de the crank bearing pin or the crank pin. The shafts of the gear wheel can be rotated and displaced in the Such a crank arrangement is already known shaft of the associated part, which is hollow. stored and (DT-PS 2 38 191). The stroke is adjusted with a notch at its end facing outwards this arrangement by turning a lifting disc, the 55 or another equivalent device the rotating shaft of the actual crank disk. the hollow with a stucco tool is arranged eccentrically. Noting the doing shaft accessible, st. This w.rd the construction The set stroke is simplified by means of a special, since a special bore in a Te 1 Slip ring, which is no longer required by means of an adjusting screw for mounting the gear. Grinding against a 60 attached to the lifting disc. In addition, the setting can be done with help Ring is brought. By tightening the fastening general using any tools available screw that is opposite to the adjustment screw, z. B. with help from a screwdriver, The slip ring acts against the if a notch is applied or a sleckan the ring attached to the lifting disc must be pressed, if it is instead of a notch emc v the lifting disc in the set position 65 or hexagonal Vert.efung acts and there the end is being held. The attachment thus requires a considerable amount of the outward direction to the gear shaft Tightening the mounting screw removes a special turned end of the hollow shaft inside manual operation. this wave can lie, w.rd gle.chze.t.g s.cherge-