TELESCOPIC LEGS AND TABLES
A telescopic leg has a housing with a lift cylinder or mechanical screw jack type lift and an external track for adjustably coupling to a member. Such telescopic legs can be used to define a variety of table base configurations by providing multiple angularly aligned tracks in each leg for receiving cross supports which can be selectively coupled to a desired location along the tracks.
This application is a continuation of U.S. patent application Ser. No. 10/738,806 filed on Dec. 17, 2003, entitled TELESCOPIC LEGS AND TABLES, now U.S. Pat. No. ______, which claimed priority under 35 U.S.C. § 119(e) to U.S. Provisional Application No. 60/434,527, entitled TABLE WITH ADJUSTABLE LEGS, filed on Dec. 18, 2002, by James E. Doyle, the entire disclosures of which are incorporated herein by reference.
BACKGROUND OF THE INVENTIONThe present invention relates to an extruded leg which integrally includes a lift cylinder and at least one slotted track for adjustably receiving one or more struts to provide a system for manufacturing height adjustable objects, such as tables in selectable configurations.
Telescopic table legs are commonly used in work places for adjusting work surface heights for a variety of uses, such as positioning the work surface for standing or various sitting positions. Electrically driven linear actuators are frequently employed to control the height of tables having telescopic legs. A few such proposals are disclosed in U.S. Pat. Nos. 5,553,550, 6,352,037, 6,360,675, 6,435,048, 6,494,005, and published application U.S. Ser. No. 09/870,091 (Publication No. 2002/0074477 A1). These systems each employ dedicated leg designs which allow use of an actuator for raising the table of a given configuration between different height adjusted levels. Likewise, pending U.S. patent application entitled ADJUSTABLE TABLE ASSEMBLY, Ser. No. 10/218,650, filed Aug. 14, 2002, discloses a table with adjustable height but one which has a specific configuration.
There are several extruded aluminum strut systems which allow different table configurations to be fabricated from universal extruded members, such as provided by Bosch Automation, Parker Hannifin Corporation, and others. Such tables, which can be configured in a variety of shapes and sizes, once constructed, are not adjustable without reassembly. In the past, in order to vertically adjust such tables, lift cylinders have been secured to the legs of the tables by drilling holes through the legs and extending fasteners through the legs and into threaded apertures in the lift cylinder housing for mounting the cylinders on the side of the legs. Although such construction provides adjustable table heights for a table configuration utilizing the extruded members, the mounting of such lift cylinders is somewhat difficult, requiring drilling of holes through the table legs. Once mounted, the lift cylinder cannot be vertically adjusted.
There exists a need, therefore, for an improved system which allows the telescopic height adjustment of tables and construction of tables with different configurations, including different sizes, dimensions, and shapes and which provides a greater adjustment flexibility.
SUMMARY OF THE INVENTIONThe telescopic leg assembly of the present invention integrates a lift cylinder actuator and an extruded leg having at least one elongated track for receiving struts which can be used to define a support base for a variety of adjustable members. In a preferred embodiment, the actuator includes a housing which defines one or more elongated tracks in the form of slots for receiving fasteners for cross-members defining a table support structure. In one embodiment of the invention, a lift cylinder housing includes a single longitudinally extending extruded track defining a T-shaped slot for receiving a fastener nut and threaded fastener coupled to a cross member without the need for threaded apertures in the actuator housing. In another embodiment of the invention, the lift cylinder integrally includes two or more tracks which may be elongated T-shaped slots arranged in angular relationship to define corner legs, intermediate legs, or angularly related legs for a variety of table base configurations. In all embodiments of the present invention, a lift cylinder housing is provided with at least one elongated track such that a lift cylinder is integrated within the leg so-formed, which can be attached to a support member to provide vertical adjustment thereto.
These and other features, objects and advantages of the present invention will become apparent upon reading the following description thereof together with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Turning initially to the first embodiment of the invention shown in
The end of barbed piston rod 22 is pressed into a central aperture 13 in seal cap 23, which is snap-fitted by flanges 19 (
Piston 24 rides along the cylindrical internal diameter of piston cylinder 27, which is coupled to a connecting head 28 which, in turn, is concentrically mounted within bore 20 near the top of housing 14. A cylindrical guide bushing 21 extends between the outer diameter of leg 16 and the inner cylindrical bore 20 of housing 14, as best seen in
Extruded housing 14 integrally includes an external vertically extending elongated track 30 which includes a T-shaped slot 32 extending longitudinally along substantially the length of housing 14 to slidably and adjustably receive threaded T-shaped locking nuts 34 and 36 (
The telescopic leg 10 so defined can be coupled to a member 40 in a variety of applications to provide an adjustable support leg. Leg 10 can be employed in applications other than table leg configurations to provide a vertically adjustable connection to a member 40 in a number of environments which allow member 40 to be adjustably positioned along the vertical length of slot 32 in housing 14 of the telescopic leg as well as subsequently adjusted by the extension of telescopic leg 16 within leg 10.
A specific rectangular table configuration employing the system of the present invention is now described in connection with
Housing 114 for legs 100 also includes a pair of integrally formed sides 106 and 108 joining sides 105 to 102 and 107 to 102, respectively at 45° angles to complete the outer periphery of the extruded aluminum or aluminum alloy housing 114 of the leg 100. Housing 114 includes a cylindrical center bore 120 defining the inner cylindrical wall of the telescopic leg assembly so formed, as seen in
As can be appreciated, the design of table base 60 can be any particular shape depending upon the length of the opposed facing cross members. It can be a square table, a narrow rectangular table, or a wide rectangular table, as desired. The adjustable height of the table is selected by the length of the housing 114 and the extension of telescopic leg 116 carried therein, such that a table having a shape, size, and adjustable height to conform to a desired work place or other environment can be provided. The upper end of table legs 100 are enclosed by a cap 131 (
Relatively large tables, such as shown in fragmentary view in
Other table configurations can be provided, such as triangular tables (shown in
Another triangular shaped base 460 can be made with one leg 400 (
As can be appreciated, the adjustable legs of the present invention thus provide an integral telescopically adjustable leg with at least one elongated mounting track. In one preferred embodiment, multiple tracks in the form of slots can be angularly related in any desired configuration to provide differently configured table bases to provide adjustable table supports for a variety of table configurations. Although the preferred embodiment disclosed employs fluid-actuated cylinders for the telescopic extension of the adjustable legs, in some embodiments it may be desirable to utilize mechanical screw-jack type manual or motor-driven adjustable telescopic legs, such as disclosed in U.S. Pat. No. 6,595,144, the disclosure of which is incorporated herein by reference. Such legs also would integrally include an extruded housing having T-shaped or other configured slots for receiving cross members for defining table bases of different configurations. Also, the track(s) extending along the outer surface of the telescopic leg can take on other forms and may, for example, be T-shaped projections for receiving a T-shaped slot in a mating member that includes a suitable locking fastener.
These and other modifications to the preferred embodiment of the invention will become apparent to those skilled in the art and will fall within the spirit and scope of the invention as defined by the appended claims.
Claims
1. A telescopic leg comprising:
- an elongated leg defined by a housing having a generally cylindrical bore for receiving a lift member therein, at least one elongated track integrally formed in said housing externally to said bore, said track extending in parallel spaced relationship to the axis of said cylindrical bore and adapted to receive a fastener for coupling said leg to another member at a selected location along said track; and
- a piston-actuated lift member mounted in said bore.
2. The telescopic leg as defined in claim 1 wherein said track is a generally T-shaped slot.
3. The telescopic leg as defined in claim 1 wherein said leg includes at least two elongated tracks extending in angular relationship with respect to each other and each including a generally T-shaped slot facing outwardly from the axis of the bore.
4. The telescopic leg as defined in claim 2 wherein said lift member is a hydraulic lift.
5. The telescopic leg as defined in claim 2 wherein said lift member is a screw jack.
6. The telescopic leg as defined in claim 1 wherein said leg is extruded.
7. The telescopic leg as defined in claim 6 wherein said leg is extruded of an aluminum material.
8. The telescopic leg as defined in claim 1 wherein said track is a T-shaped slot adapted to receive a T-shaped nut and wherein said leg includes a pin extending across said slot at a predetermined location to limit the motion of said nut in said slot.
9. A telescopic leg comprising:
- an elongated stationery leg defined by an extruded housing having an upper end and a lower end, wherein said lower end of said housing has an opening, said housing also including a generally cylindrical bore for receiving a lift member therein; said housing further including at least one elongated track integrally formed in said housing externally to said bore, said track extending in parallel spaced relationship to the axis of said cylindrical bore and facing outwardly for receiving a fastener for coupling said leg to another member at a selectable location along said track;
- a lift member mounted in fixed relationship within said housing, said lift member including a piston actuated cylinder including a piston rod and a leg coupled to said piston rod for extending outwardly from said bore through said opening at said lower end of said housing, said lift member further including a mounting head at an end opposite said leg; and
- a coupling member extending between said mounting head of said lift member and said housing for securing said lift member within said bore.
10. The telescopic leg as defined in claim 9 wherein said coupling member is a snap ring.
11. The telescopic leg as defined in claim 10 wherein said track is a generally T-shaped slot.
12. The telescopic leg as defined in claim 9 wherein said track is a T-shaped slot adapted to receive a T-shaped nut and wherein said leg includes a pin extending across said slot at a predetermined location to limit the motion of said nut in said slot.
13. A telescopic leg comprising:
- an elongated leg defined by an extruded housing having an upper end and a lower end, said housing including a generally cylindrical bore for receiving a lift member therein; said housing further including at least one elongated track integrally formed in said housing externally to said bore, said track extending in parallel spaced relationship to the axis of said cylindrical bore and facing outwardly for receiving a fastener for coupling said leg to another member at a selectable location along said track;
- a lift member including a piston actuated cylinder mounted within said bore, said lift member including a piston rod and a leg coupled to said piston rod for extending outwardly from said bore at said lower end of said housing, said lift member further including a mounting head at an end opposite said leg;
- a snap ring coupled to said upper end of said housing and to said mounting head of said lift member for securing said lift member within said bore; and
- a cylindrical bushing extending between said bore and said leg at said lower end of said housing.
14. The telescopic leg as defined in claim 13 wherein said track is a T-shaped slot adapted to receive a T-shaped nut and wherein said leg includes a pin extending across said slot at a predetermined location to limit the motion of said nut in said slot.
15. The telescopic leg as defined in claim 13 and further including a glide adapter coupled to a lower end of said leg and to an end of said piston rod.
16. The telescopic leg as defined in claim 15 and further including a glide adjustably coupled to said glide adapter.
17. The telescopic leg as defined in claim 13 wherein said lift member is a hydraulic lift.
18. The telescopic leg as defined in claim 13 wherein said housing is extruded of an aluminum material
19. The telescopic leg as defined in claim 13 wherein said housing includes at least two elongated tracks extending in angular relationship with respect to each other and each including a generally T-shaped slot facing outwardly from the axis of said bore.
Type: Application
Filed: Jun 12, 2007
Publication Date: Oct 4, 2007
Inventor: James Doyle (Grandville, MI)
Application Number: 11/761,569
International Classification: F16M 11/26 (20060101);