Source: http://www.google.com/patents/US4545555?dq=5,912,661
Timestamp: 2014-10-26 02:21:56
Document Index: 421475957

Matched Legal Cases: ['art 12', 'art 12', 'art 16', 'art 16', 'art 20', 'art 20']

Patent US4545555 - Adjustable arm member for use with a lamp or the like - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn adjustable arm includes a base member with a base rotatable joint member connected thereto, a lower arm having one end connected to the base rotatable joint member with a central joint member connected to the other end thereof and also to one end of an upper arm while a head joint member is connected...http://www.google.com/patents/US4545555?utm_source=gb-gplus-sharePatent US4545555 - Adjustable arm member for use with a lamp or the likeAdvanced Patent SearchPublication numberUS4545555 APublication typeGrantApplication numberUS 06/627,183Publication dateOct 8, 1985Filing dateJul 2, 1984Priority dateJul 2, 1984Fee statusLapsedPublication number06627183, 627183, US 4545555 A, US 4545555A, US-A-4545555, US4545555 A, US4545555AInventorsMark B. KochOriginal AssigneeKoch Mark BExport CitationBiBTeX, EndNote, RefManPatent Citations (4), Referenced by (35), Classifications (15), Legal Events (7) External Links: USPTO, USPTO Assignment, EspacenetAdjustable arm member for use with a lamp or the likeUS 4545555 AAbstract An adjustable arm includes a base member with a base rotatable joint member connected thereto, a lower arm having one end connected to the base rotatable joint member with a central joint member connected to the other end thereof and also to one end of an upper arm while a head joint member is connected to the other end of the upper arm. An elongated means under tension is provided within the arms and about the joint members for maintaining the position of the head end in given angular position.
What is claimed is: 1. An adjustable arm comprising: a base member; a base rotatable joint member connected to said base member, said base rotatable joint member including a base housing and a base drum member fixed to said housing; a lower arm having one end connected to said base rotatable joint member; a central joint member connected to the other end of said lower arm, said central joint member including a central housing and a freely-rotatable central drum member in said housing; an upper arm having one end connected to said central joint member; a head joint member connected to the other end of said upper arm; said head joint member including a head housing and a head drum member fixed in said housing; each of said drum members having an axis orthogonal to the axes of said arms; and an elongated means under tension within said arms and about said joint members for maintaining the position of the head end in a given angular position, said elongated means including a lower arm cable having one end fixed to and partially wrapped around said base drum member and another end fixed to and partially wrapped around said central drum member, and an upper arm cable having one end fixed to and partially wrapped around said central drum member and another end fixed to and partially wrapped around said head drum member.
BACKGROUND OF THE INVENTION This invention pertains to articulated adjustable arms and, more particularly, to such arms which can be freely movable and maintained in desired positions. Adjustable articulated arms have many uses. A very desirable use is for a lamp to place the necessary working light where it is needed. The two most prominent methods to effect such support are (1) directly friction loading to the joints so that they grip to support the load and (2) counterbalancing the load by use of springs.
SUMMARY OF THE INVENTION It is, accordingly, an object of the invention to provide an articulated arm suitable for use in lamps that counterbalances the state of a load and allows for easy adjustments while maintaining a constant angle of the lamp head joints with any position to which the arm is moved.
BRIEF DESCRIPTION OF THE DRAWINGS Other objects, the features and advantages of the invention will be apparent from the following detailed description which shows, by way of example and not limitation, the presently preferred embodiment of the invention.
IN THE DRAWING FIG. 1 is a side elevation of an adjustable arm in accordance with the invention;
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION In FIG. 1 there is shown a lamp in accordance with the teachings of the invention. The lamp includes a base which, by way of example, is shown as a C-clamp. Base 10 is connected to one part 12a of a base joint 12. The outer part 12b of the base joint is fixed to one end of a lower arm 14. The other end of lower arm 14 is connected to one part 16a of a central joint 16 whose other part 16b is connected to one end of an upper arm 18. The other end of upper arm 18 is connected to one part 20a of a head joint 20 while the other part 20b of the head joint 20 is connected to a light element 22. The light element can include a light socket (not shown), the light shade 22a with a wrist joint 22b to position the light.
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