Drive device for back and forth movement

Claim 2

A drive device for subjecting a follower to back and forth movement between end points, comprising: a. a magnetic-rotor synchronous motor operatively connected to a source of alternating current, said motor being started in either one of the two directions of rotation by vibration start; b. a shaft on said rotor; c. means defining an element with helical turns, said element being coupled to said shaft and disposed to be rotated about its longitudinal axis by said shaft; d. abutment means disposed at the end points; e. a follower operatively engaged in the helical turns of said element to be axially displaceable along said element and between said abutment means while being secured against rotation; f. a slitted guide tube containing said element; g. a housing containing said motor, said guide tube being connected to said housing; h. a connecting piece and an extension on said motor housing; said guide tube and said extension being inserted into said connecting piece to connect said guide tube and said motor housing; i. a current supply circuit connected between the source of alternating current and said motor; j. electrical switch means in said circuit, said switch means having a switching member and a pair of stationary contacts; k. means operatively connecting said switching member to said shaft of said motor; and l. a manually actuatable switch connected in a bridging arrangement between said switching member and said stationary contacts, whereby when said shaft is rotated in one direction said switching member is moved to one of said pair of stationary contacts to close said circuit to said motor and, when said shaft is rotated in the opposite direction, said switching member is moved to the other of said stationary contacts to again close said circuit to said motor.

Claim 3

A drive device for subjecting a member to back and forth movement between end points, comprising in combination: a. a magnetic-rotor synchronous motor including a shaft attached to said rotor, said motor being startable in either one of the two senses of rotation by vibration start; b. means defining an element with helical turns, said element being coupled to said shaft and disposed to be rotated about its longitudinal axis by said shaft; c. abutment means disposed at the end points; d. a follower, constituting said member, operatively engaged in the helical turns of said element to be axially displaceable along said element and between said abUtment means while being secured against rotation; e. a current supply circuit connecting an a.c. source to said motor to operate the same; f. a first electrical switch means contained in said circuit and having stationary contact means and a switching member being movable into a circuit-closing position in which it is in engagement with said stationary contact means and into a circuit-opening position in which it is out of contact with said stationary contact means; g. means operatively connecting said switching member to said shaft for moving said switching member into and maintaining it in said circuit-closing position in response to and during the rotation of said shaft and for moving said switching member into and maintaining it in said circuit-opening position in response to and during stoppage of said shaft; and h. an arbitrarily actuatable second electrical switch means connected in parallel with said first switch means, said second switch means having a circuit-opening position and a circuit-closing position; in the circuit-closing position of said second switch means said first switch means is short-circuited, whereby said motor is supplied with current independently from the positions of said first switch means.

Claim 4

A drive device for subjecting a member to back and forth movement between end points, comprising in combination: a. a magnetic-rotor synchronous motor including a shaft attached to said rotor, said motor being startable in either one of the two senses of rotation by vibration start; b. means defining an element with helical turns, said element being coupled to said shaft and disposed to be rotated about its longitudinal axis by said shaft; c. abutment means disposed at the end points; d. a follower, constituting said member, operatively engaged in the helical turns of said element to be axially displaceable along said element and between said abUtment means while being secured against rotation; e. a current supply circuit connecting an a.c. source to said motor to operate the same; f. a first electrical switch means contained in said circuit and having stationary contact means and a switching member being movable into a circuit-closing position in which it is in engagement with said stationary contact means and into a circuit-opening position in which it is out of contact with said stationary contact means; g. means operatively connecting said switching member to said shaft for moving said switching member into and maintaining it in said circuit-closing position in response to and during the rotation of said shaft and for moving said switching member into and maintaining it in said circuit-opening position in response to and during stoppage of said shaft; and h. an arbitrarily actuatable second electrical switch means connected in parallel with said first switch means, said second switch means having a circuit-opening position and a circuit-closing position; in the circuit-closing position of said second switch means said first switch means is short-circuited, whereby said motor is supplied with current independently from the positions of said first switch means.

Claim 5

A device as defined in claim 2, wherein said stationary contact means of said first electrical switch means includes two spaced first and second stationary contacts; said switching member being movable into a first circuit-closing position in which it is in engagement with said first stationary contact, said switching member being movable into a second circuit-closing position in which it is in engagement with said second stationary contact; said means operatively connecting said switching member to said shaft causes said shaft to move said switching member into and maintain it in said first circuit-closing position during the rotation of said shaft in one sense and causes said shaft to move said switching member into and maintain it in said second circuit-closing position during the rotation of said shaft in the other sense.

Claim 6

A device as defined in claim 2, wherein said element is a helical spring.

Claim 7

A device as defined in claim 4, wherein said helical spring is of spring steel wire.

Claim 8

A device as defined in claim 2, wherein said element is a worm formed of flexible plastic material.

Claim 9

A device as defined in claim 2, further comprising a slitted guide tube and wherein said element is disposed in said tube.

Claim 10

A device as defined in claim 7, wherein said guide tube is made of flexible plastic material.

Claim 11

A device as defined in claim 8, further comprising means associated with said follower and driven thereby, and means defining a guide rail in said guide tube, and wherein said means associated with said follower and said follower are both operatively engaged in said guide rail for movement therealong.

Claim 12

A device as defined in claim 9 wherein said means associated with said follower include slides for supporting curtains and drapes and said slides are received in said guide rail.

Claim 13

A device as defined in claim 7 wherein said motor has a housing and said guide tube is connected with said housing.

Claim 14

A device as defined in claim 11 further comprising a connecting piece and an extension on said motor housing, and wherein said guide tube and said extension are inserted into said connecting piece to connect said guide tube and said motor housing.

Claim 15

A device as defined in claim 2, when said means operatively connecting said switching member to said shaft is a friction bearing.

Claim 16

A device as defined in claim 12, further comprising means defining a housing in said connecting piece, and said electrical switch means is received in said housing.