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Retractable-helical-antenna

Ambient or low-temperature curable coatings

What is claimed is: 1. An ambient or low-temperature curable polymer composition adapted to coat a ...

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Enlarged-hetero-ring prostacyclin analogs

I claim: 1. A 5Z compound of the formula ##STR115## wherein L is (1) --(CH.sub.2).sub.d --C(R.sub.2)...

8-Methoxypsoralen derivatives

What is claimed is: 1. A compound of the formula ##STR7## wherein R.sub.2 is selected from the ...

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OF THE INVENTION In formula I the lower alkyl groups include straight or branched chain ...

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Accordingly, an object of the present invention is to provide a recording and/or reproducing ...

Facsimile apparatus and facsimile system

It is an object of the present invention to provide a facsimile apparatus and a facsimile system ...

Apparatus for locking and unlocking a flap door

According to the invention the present flap door locking and unlocking mechanism comprises a ...

Dynamic skew correction for multichannel analog recording

OF THE PREFERRED EMBODIMENT The problem presented is to resolve channel-to-channel time ...

Diagnostic system of magnetic recording channel and magnetic disk drive apparatus

It is important for the equalizer to modify the characteristics thereof by adding attenuators 33, 35...

Retractable helical antenna

Details

Inventors: Marino, Frank;
Assignee:
Primary Examiner: Hajec; Donald
Assistant Examiner: Phan; Tho G.
Attorney, Agent or Firm: Marino; Francis E.

A retractable antenna assembly having a helically coiled antenna, a bushing having a helically threaded hole fully therethrough which freely engages the helical coil, and a driver to cause helical motion to the antenna relative to the bushing, and thereby extend or retract the antenna.

DETAILED DESCRIPTION In view of the above, the invention hereby disclosed comprises a mechanism to facilitate the retraction and extension of a helically shaped antenna shaft by using the shaft helix itself and a mating helix within the guide bushing as a screwthread type interface which guides and/or limits the displacement of the shaft such that the shaft will be displaced helically as it is rotated about the axis of the helix, or as it is driven axially by a device which allows such rotation.

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