Pivotable antenna and electrical device having a pivotable antenna

• US 5,617,106 A
• Filed: 04/20/1995
• Issued: 04/01/1997
• Est. Priority Date: 04/20/1995
• Status: Expired due to Fees

• Current Assignee: Sierra Wireless Incorporated
• Original Assignee: Sierra Wireless Incorporated
• Inventors: Tahmassebpur, Mohammed
• Primary Examiner(s): Hajec, Donald T.
• Assistant Examiner(s): Ho, Tan
• Application Number:
  US08/425,745
• Time in Patent Office: 712 Days
• Field of Search: 343/702, 343/872, 343/873, 343/888, 343/906, 439/916, 439/578, 439/581, 455/99, 455/347, 455/351, 174/65 R, 174/75 C, 174/88 C, 174/152 A, 174/253 A, 285/184, 285/311, 285/312
• US Class Current: 343/702
• CPC Class Codes: H01Q 1/084 Pivotable antennas
• CPC Class Codes: H01Q 1/242 specially adapted for hand-held use
• CPC Class Codes: Y10S 439/916 Antenna

Abstract

In a pivotable antenna assembly, a pivot rod is provided having an axial opening therein at a first end thereof and a radial opening extending to the axial opening. An antenna is provided, the antenna having an antenna element and a portion through which a portion of the pivot rod extends such that the axial opening of the pivot rod is inside the portion of the antenna. A coaxial cable having a first end is provided, the coaxial cable including a central conductor, a dielectric material around the conductor, a shielding material around the dielectric material, and a jacket around the dielectric material, the first end of the coaxial cable extending into the axial opening of the pivot rod, the shielding being attached to an interior wall of the pivot rod, and the conductor extending through the radial opening and being attached to the antenna element. A method for making a pivotable antenna assembly is also disclosed.

Claims

1. An electrical device having a pivotable antenna assembly, comprising:

a conductive pivot rod having an axial opening therein at a first end thereof and a radial opening extending to the axial opening;

an antenna having an antenna element and a portion through which a portion of the pivot rod extends such that the radial opening of the pivot rod is inside the portion of the antenna;

a coaxial cable having a first end, the coaxial cable including a central conductor, a dielectric material around the conductor, a shielding material around the dielectric material, and a jacket around the dielectric material, the first end of the coaxial cable extending into the axial opening of the pivot rod, the shielding being attached to an interior wall of the pivot rod, and the conductor extending through the radial opening and being attached to the antenna element; and

a casing for electrical equipment, the casing including a casing bore for receiving a second portion of the pivot rod such that the pivot rod contacts a wall of the casing bore and is pivotable in the casing bore, at least a surface of the wall of the casing bore being a conductive material such that the pivot rod is grounded by the conductive material.

2. The electrical device as set forth in claim 1, further comprising a conductive member grounded to electrical equipment housed in the casing, an end of the conductive member being forced against the pivot rod for grounding the pivot rod.

3. The electrical device as set forth in claim 2, wherein the conductive member is a leaf spring.

4. The electrical device as set forth in claim 1, wherein the shielding of the coaxial cable is attached to the interior wall of the pivot rod by solder.

5. The electrical device as set forth in claim 1, wherein the shielding of the coaxial cable is attached to the interior wall of the pivot rod by a crimp in the pivot rod.

6. The electrical device as set forth in claim 1, wherein the coaxial cable is a double served coaxial cable.

7. The electrical device as set forth in claim 1, wherein a portion of the coaxial cable is helically wound to absorb torsional forces caused by pivoting the antenna relative to the casing.

8. The electrical device as set forth in claim 1, wherein the antenna includes an antenna housing formed around the antenna element.

9. The electrical device as set forth in claim 8, wherein a bottom portion of the antenna housing is substantially cylindrical, the portion of the antenna through which the portion of the pivot rod extends including an antenna bore extending axially through the substantially cylindrical bottom portion of the antenna housing.

10. The electrical device as set forth in claim 9, wherein the cylindrical bottom portion of the antenna housing has a plurality of recesses provided circumferentially around the cylindrical bottom portion, and a resilient member having a protuberance receivable in the recesses and formed on a surface of the resilient member extends outwardly from a wall of the casing such that the surface of the resilient member is substantially adjacent the cylindrical bottom portion of the antenna, wherein, when the antenna is pivoted relative to the casing, the resilient member yields sufficiently to permit the protuberance to exit and enter successive ones of the recesses, the protuberance being received in a selected one of the recesses to hold the antenna in a desired angular relationship to the casing.

11. The electrical device as set forth in claim 10, wherein the antenna housing is plastic.

12. The electrical device as set forth in claim 1, wherein the antenna is linked directly to electrical equipment inside of the casing by the coaxial cable.

13. The electrical device as set forth in claim 1, wherein conductive material closes a second end of the pivot rod and is attached to the pivot rod.

14. The electrical device as set forth in claim 13, wherein the conductive material closing the second end of the pivot rod is a plug of conductive material.

15. A pivotable antenna assembly, comprising:

a pivot rod having an axial opening therein at a first end thereof and a radial opening extending to the axial opening;

an antenna having an antenna element and a portion through which a portion of the pivot rod extends such that the radial opening of the pivot rod is inside the portion of the antenna; and

a coaxial cable having a first end, the coaxial cable including a central conductor, a dielectric material around the conductor, a shielding material around the dielectric material, and a jacket around the dielectric material, the first end of the coaxial cable extending into the axial opening of the pivot rod, the shielding being attached to an interior wall of the pivot rod, and the conductor extending through the radial opening and being attached to the antenna element.

16. The pivotable antenna assembly as set forth in claim 15, wherein a portion of the coaxial cable is helically wound to absorb torsional forces caused by pivoting the antenna relative to a portion of the coaxial cable.

17. The pivotable antenna assembly as set forth in claim 15, wherein the shielding of the coaxial cable is attached to the interior wall of the pivot rod by solder.

18. The pivotable antenna assembly as set forth in claim 15, wherein the shielding of the coaxial cable is attached to the interior wall of the pivot rod by a crimp in the pivot rod.

19. The pivotable antenna assembly as set forth in claim 15, wherein the coaxial cable is a double served coaxial cable.

20. The pivotable antenna assembly as set forth in claim 15, wherein the pivot rod is formed of a conductive material.

21. A method for making a pivotable antenna assembly, comprising the steps of:

attaching a spacer clip to an antenna element;

inserting a conductive pivot rod inside a semi-circular end portion of the spacer clip, the pivot rod having an axial opening and a radial opening; and

attaching a conductor of a coaxial cable to the antenna element, the conductor extending through the radial opening of the pivot rod into the axial opening of the pivot rod, the coaxial cable extending out of a first end of the pivot rod.

22. The method as set forth in claim 21, comprising the further step of securing a shielding layer of the coaxial cable to an inside wall of the pivot rod.

23. The method as set forth in claim 21, comprising the further step of insert molding the spacer clip, the antenna element, and a portion of the pivot rod including the radial opening inside of an antenna housing.

24. The method as set forth in claim 21, comprising the further step of permanently forming one or more helical winds in the coaxial cable outside of the pivot rod.

25. The method as set forth in claim 21, comprising the further step of plugging the axial opening at a second end of the pivot rod with a conductive material.