US1748307A - Means for reversing a lever upon alteration in the direction of rotation of a shaft - Google Patents

Description

Feb. 25, 1930.-

I E. PETERS 1,748,307 MEANS'FOR REVERSING A LEVER UPON ALTERATION IN THE DIRECTION OF ROTATION OF A SHAFT Filed Dec 11. 1926 I Patented Feb; 2 5, 1 930 UNITED STATES ERNST PETERS, oE

BERLIN, GERMANY MEANS FOR REVEBSING A LEVER UPON ALTERATION IN THE DIRECTION OF ROTATION OF A Application filed December 1-1, 1926, Serial This invention relates to means for reversing a lever upon alteration in the direction of rotation of a shaft.

It is sometimes necessary to reverse a lever 5 by means of a revolving shaft as soon as the latter varies its direction of rotation.

With this object in View the shaft is preferably furnished with, a projecting portion, which during its movement strikes against a displaceable member and moves the same into a difierent position.

In such cases, however, the'difiiculty arises that the lever to be reversed, or an auxiliary member respectively, which is coupled therewith with a certain amount of play, requires after its displacement' into one of the extreme positions to be again brought by suitable means into the path of the revolving projection, otherwise upon an alteration in the dimotion of rotation the same will not be struck and will simply remain unaffected.

In the case of the hitherto'known reversal mechanisms of this type the return movement referred to has been effected by a continuously acting spring, this resulting in renewed contact between the parts upon each revolution, andacc ordingly' in very rapid wear.

It has'been proposed to lessen this drawback by moving the revolving projection by means of a centrifugal arrangement out of I reach of the member to be displaced as soon as the revolutions have exceeded a certain amount, so that beyond such number of revolutions contact between the parts no longer occurs.

j The present invention relates to a reversal mechanism in which a centrifugal apparatus is not required, andis wh ich, after reversal has beenefi'ected, renewed contact between 40 the revolving nose portion and,the member to be reversed does not occur.

The basic idea of the invention consists in causing the force, which is transmitted from the shaft to the lever to be displaced for the purpose of causing its reversal, to consist of two components, viz, a positive component and a non-positive component, of which components, the-latter acts continuously and on the one hand is intended, after effected reversal, to hold the auxiliary member out of SHAFT v No. 154,136, and in Germany July 30, 1925.

reach of the revolving projection, and'on the other handto move the same again into'the path of-the projection as soon as the direction of rotation of the shaft is altered.

The invention will now be described more fully with reference to the accompanying drawing, in 'which Fig. 1 shows a possible form of embodi-v ment viewed from the front, whilst Fig. 2 is a side VIGW,

Referring to the drawing, D is the shaft, and E the lever having its fulcrum point at B, which lever is to be reversed upon alteration 'in the direction of rotation. F is an auxiliary member, which is also oscillatory about the point B, .and which strikes against one ofthe two studs G mounted on the lever E and picks up the same together with the lever E when executing a sulficiently large stroke. r

The reversing force exerted by the shaft 1) on the lever E upon an alteration in the direction of rotation consists, according to the invention, of two components. The one, which is not of a positive nature, proceeds from a disc I-I mounted on the shaft D, and is, transmitted to the auxiliary member F by means of a friction member which is pressed against the disc H by the member F.

In accordance, therefore, with the direction of rotationvof the disc H, the auxiliary member'F will continuously rest against the one or the other of the two studs G by reason of the slight friction between H and J.

The second, positive'component of the reversing force is exerted by a projection K, which is firmly seated on the shaft D, as soon as the same strikes against the abutment L on the auxiliafy member.-

It is assumed that the direction of rotation is as illustratedin- Fig. 1; further, that the auxiliary member F, has. been in any position in which the abutment L extends into the path of the revolving projection K. Upon the first rotation of the shaft the auxiliary member F would accordingly be displaced in positive manner to such extent towards the left until the projection K were able to pass away underneath the abutment L." In this manner, by means of the one stop G, the lever E would also be conjointly displaced into the one extreme position illustrated in Fig. 1. 4

By reason of the slight friction which continuously prevails between H and J the aux-' moved in positive manner to such extent to-' wards the right until K and L are again able to pass by each other and the path for K is clear.

In this manner the lever E, by means of the right hand stud G, is moved into its other extreme position, and the auxiliary member -F, as a result of the friction between H and J, again remains continuously out of the path 'of the projection K.

Theoretically, inthe case of the arrangement described, the auxiliary member F will be moved by the projection K to such extent towards the side that upon succeeding revolutions of the shaft contact between the twopart continues the rotation of E to a some- What greater extent than is caused positively by the projection K, in order, despite any elastic return, to move the abutment L completely out of the path of the projection K. Two stops N limit the further displacement of the lever E.

The force component which is not of a positive kind may, in place of the friction as described, also consist in a magnet-electric force, such as occurs for example in generating eddy currents, or in the action of a strong draught, or the like.

A device according to the present invention may, for'e'xamp-le, in the case of alteration in the direction of rotation of a shaft, serve for the purpose of adjusting electric contacts, or to cause a change of tools on tool machines, etc.

What I claim as new and desire to secure by Letters Patent'is:

I 1. In an apparatus for reversing a lever u onalteration in the direction of rotation 0 a-shaft, an abutment on the said shaft, an auxiliary member movably mounted on said lever, said member being adapted to engage against the abutment on said shaft upon a1- teration in the direction of rotation of the said shaft, a disc mounted on the said shaft, a friction member pressed against the said disc by a spring acting against the said auxiliary member, studs provided on the said lever to limit the movement of the auxiliary member, and stops for limiting the displacement of the said lever.

2. In an apparatus for reversing a lever upon alteration in the direction of rotation of a shaft, an-abutment on the said shaft, an auxiliary member movably mounted on said lever, said memberbeing adapted to engage againstthe abutment on said shaft'upon al-.

teration in the direction of rotation of the said shaft, a disc mounted on the said shaft, a friction member pressed against thesaid disc by a spring acting against the said auxiliary member, studs provided on the said lever to I limit'the movement of the auxiliary member, a tip spring for meving the said lever to a slightly greater extent towards the one or other side than is normally performed positively by the said projection, and stops for limiting the displacement of the said lever, the projection and the abutment of the auxiliary member being movable out of engagement with'each other after effected alteration in the direction of rotation of the shaft and into engaging position upon further alteration in the direction of rotation.

3-. In an apparatus for reversing a lever upon alteration in the. direction of a shaft, an arm pivoted on said lever, means on said lever for limiting the movement of said arm relative tothe lever, means on said shaft for engaging said arm to rocksaid lever, and frictional means for causing effective engagement between said arm and said engaging means upon alteration in the direction of rotation of the said shaft, and causing cessation of the effective engagement when a further alteration in the direction of rotation of said shaft has taken place.

- In testimony whereof I have aflixed my signature.

ERNST PETERS.

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