Height Adjustable Furniture Leg

The present application is based on, and a claim of priority is made under 35 U.S.C. Section 119(e) to a provisional patent application that is currently pending in the U.S. Patent and Trademark Office, namely, that having Ser. No. 63/634,128 and a filing date of Apr. 15, 2024, which is incorporated by reference herein in its entirety.

The present invention relates generally to furniture support structures and, more particularly, to a height adjustable furniture leg that allows for selective adjustment of furniture height while minimizing the visibility of the adjustment mechanism.

Furniture with height-adjustable legs is widely used in residential, commercial, and industrial settings. Adjustable legs allow users to compensate for uneven flooring, modify furniture height for ergonomic reasons, and provide stability when standard fixed legs would result in wobbling or imbalance. Various mechanisms have been employed to facilitate height adjustment, including threaded connections, telescoping segments, locking pins, and ratcheting systems. While these designs provide functional benefits, they also introduce a number of drawbacks related to aesthetics, stability, durability, and ease of use.

One of the most common issues with conventional height-adjustable furniture legs is the visual disruption caused by the adjustment mechanism. Many existing designs incorporate a threaded shaft, telescoping sleeve, or other mechanical connection between two separate segments of the leg. When the height is adjusted, these components create a visible gap, seam, or exposed section that disrupts the otherwise uniform appearance of the leg. In some cases, the gap may be small, but even minimal exposure of the internal mechanism can be noticeable, particularly in modern furniture designs that emphasize clean lines and seamless aesthetics.

The visibility of the adjustment mechanism becomes even more pronounced when furniture is placed on uneven flooring, where different legs may need to be adjusted to varying heights. This results in inconsistent leg appearances, with some showing extended portions while others remain fully retracted. The effect is particularly undesirable in high-end furniture, where the goal is to maintain a refined and polished look. Even when efforts are made to conceal the adjustment area through the use of decorative covers or shrouds, these solutions often introduce additional bulk, complexity, or manufacturing costs.

Another significant drawback associated with conventional height-adjustable legs is mechanical instability over time. Many height adjustment mechanisms rely on friction, threading, or locking mechanisms to maintain the desired height. However, these mechanisms are often susceptible to loosening due to repeated use, vibrations, or shifting weight loads. For example, in threaded adjustment designs, the repeated application of force—whether from everyday use, furniture movement, or environmental factors such as floor expansion and contraction—can gradually cause the threads to slip or wear down. This can result in an uneven furniture stance, forcing users to frequently readjust the legs to restore stability.

The problem of instability is exacerbated when furniture is subject to frequent movement, such as chairs, desks, or shelving units that are repositioned regularly. Height-adjustable legs that lack robust locking mechanisms may shift unintentionally, leading to an inconsistent or unreliable adjustment. Some designs attempt to address this issue with locking rings, friction collars, or tightening screws, but these additions often require additional manual effort to engage and May still degrade over time.

Durability concerns are another major drawback in this field. Adjustable legs frequently incorporate moving parts that are exposed to dust, dirt, moisture, and physical impact. When adjustment mechanisms are located near the lower portion of the leg—closer to the ground—these components are more likely to accumulate debris, which can interfere with operation. Threaded shafts, in particular, can become clogged with dirt or corroded by moisture, leading to difficulty in making adjustments or complete failure of the mechanism. Additionally, plastic or lightweight materials used in some designs may not withstand repeated height changes or heavy furniture loads, resulting in cracking, deformation, or failure at the adjustment point.

Another issue is the ease of use. While many adjustable legs are designed for manual operation, some require tools, such as wrenches or screwdrivers, to modify the height. This added complexity can be inconvenient for users who need to make frequent adjustments. Additionally, height-adjustable legs that require significant force to turn or unlock may be difficult for individuals with limited strength or dexterity, such as elderly users or those with disabilities. Designs that rely on multiple components, such as locking rings or secondary adjustment mechanisms, add further steps to the process, reducing convenience and user-friendliness.

In many environments, especially in residential and office spaces, adjustable legs must provide not only functional benefits but also an unobtrusive and aesthetically pleasing design. Traditional solutions struggle to balance these requirements, often forcing users to choose between visual appeal and practical adjustability. This compromise limits the widespread adoption of adjustable legs in high-end furniture and creates demand for solutions that effectively combine seamless aesthetics with reliable adjustability.

Beyond aesthetic and functional concerns, manufacturing and cost considerations also play a role in determining the viability of height-adjustable leg designs. Many conventional designs involve multiple interconnected parts, each of which increases production complexity and cost. Threaded systems require precision machining, while telescoping designs often necessitate the use of additional materials for inner and outer casings. More complex mechanisms, such as ratcheting or hydraulic systems, add further expense and may be impractical for mass production.

Given the widespread need for height-adjustable furniture legs and the continued presence of these issues, there remains a strong demand for an improved solution. A design that allows for effective height adjustment while minimizing visibility, improving stability, enhancing durability, and simplifying use would provide a meaningful advancement in the field. Addressing these issues holistically, without introducing additional complexity or cost, would enable broader adoption and greater functionality across various furniture applications.

The present invention is directed to a height-adjustable furniture leg that enables selective adjustment of the furniture height while maintaining a visually seamless appearance. The adjustment mechanism is strategically positioned at the upper portion of the leg, near the underside of the furniture, allowing for height modifications without exposing unsightly seams, gaps, or threaded components from a typical standing perspective. The leg is configured to rotate or otherwise engage an internal adjustment mechanism, permitting smooth height variation without the need for additional tools. This design integrates a multi-piece construction that ensures a secure and stable connection while remaining visually inconspicuous in normal use.

In contrast to conventional height-adjustable furniture legs, which often expose mechanical components, create noticeable parting seams, or suffer from instability over time, the present invention provides a refined solution that enhances both functionality and aesthetics. By positioning the adjustment mechanism at the upper portion of the leg, the invention conceals visual discontinuities that would otherwise detract from the furniture's design. Additionally, the construction of the leg reduces the risk of loosening or wear caused by repeated use, ensuring long-term stability. The concealed mechanism also protects against dirt, debris, and physical damage, improving durability and reducing maintenance. Furthermore, the user-friendly design allows for intuitive manual height adjustment without requiring excessive force or tools, making it more accessible for a wide range of users.

In a first implementation of the invention, a height-adjustable furniture leg is provided. The furniture leg includes a base configured to be mounted to an underside of a furniture frame, a leg member having an upper end and a lower end, with the upper end being rotatably coupled to the base, and an adjustment mechanism disposed at the upper end of the leg member. The adjustment mechanism is configured to selectively vary the height of the leg member relative to the base. A concealment structure is positioned at an interface between the base and the upper end of the leg member, the concealment structure being configured to obscure a parting seam created by the adjustment of the leg member from a normal viewing perspective when the furniture is in use.

In a second aspect, the adjustment mechanism may comprise a threaded connection between the base and the leg member, allowing for rotational height adjustment.

In another aspect, the threaded connection may include a locking mechanism configured to prevent unintentional height changes.

In another aspect, the concealment structure may comprise an overlapping flange extending from the base, the flange being configured to cover the parting seam during adjustment.

In another aspect, the leg member may comprise an outer sleeve and an inner telescoping section, the inner telescoping section being configured to move relative to the outer sleeve to vary the height.

In another aspect, the outer sleeve may include an internal guide structure configured to maintain axial alignment of the inner telescoping section.

In another aspect, the adjustment mechanism may be manually operable without requiring tools.

In another aspect, the adjustment mechanism may include a grip-enhancing surface on an exterior portion of the leg member to facilitate manual rotation.

In another aspect, the leg member may comprise a cylindrical shape.

In another aspect, the cylindrical shape may include a knurled or textured exterior surface to enhance grip for manual adjustment.

In another aspect, the base may be secured to the furniture frame using a plurality of fasteners arranged circumferentially around the base.

In another aspect, the base may include pre-formed mounting holes to receive the plurality of fasteners.

In another aspect, the concealment structure may be configured to automatically reposition as the leg member is adjusted, maintaining coverage of the parting seam.

In another aspect, the leg member may be composed of a metal material selected from the group consisting of aluminum, steel, and an alloy thereof.

In another aspect, the concealment structure may be composed of a flexible material to allow for seamless coverage of the parting seam.

In another aspect, the adjustment mechanism may include a detent system configured to provide discrete height settings.

In another aspect, the adjustment mechanism may be configured to provide a continuous range of height adjustment between a minimum and maximum position.

In another aspect, the leg member may further comprise a load-bearing foot at the lower end, the foot being configured to distribute weight evenly across a support surface.

In another implementation of the present invention, a method of adjusting the height of a furniture leg is provided. The method may comprise securing a base of the height-adjustable furniture leg to an underside of a furniture frame using a plurality of fasteners inserted through pre-formed mounting holes. A leg member having an upper end and a lower end may be rotatably coupled to the base, with the upper end engaging an adjustment mechanism disposed at the interface between the base and the leg member. The method may further comprise manually rotating the leg member to engage a threaded connection within the adjustment mechanism, thereby selectively varying the height of the leg relative to the base. A locking mechanism may be engaged to prevent unintentional movement of the leg after adjustment. During adjustment, a concealment structure positioned at the interface between the base and the leg member May automatically reposition to obscure a parting seam from a normal viewing perspective when the furniture is in use. The method may further include applying a grip-enhancing surface on the exterior of the leg member to facilitate manual rotation, and adjusting the leg to a discrete height setting using a detent system or to a continuously variable height between a minimum and maximum position. Once the desired height is set, the leg member may distribute weight evenly across a support surface, ensuring stability and maintaining an aesthetically seamless appearance.

Like reference numerals refer to like parts throughout the several views of the drawings.

The following detailed description is merely exemplary in nature and is not intended to limit the described embodiments or the application and uses of the described embodiments. As used herein, the word “exemplary” or “illustrative” means “serving as an example, instance, or illustration.” Any implementation described herein as “exemplary” or “illustrative” is not necessarily to be construed as preferred or advantageous over other implementations. All of the implementations described below are exemplary implementations provided to enable persons skilled in the art to make or use the embodiments of the disclosure and are not intended to limit the scope of the disclosure, which is defined by the claims. For purposes of description herein, the terms “upper”, “lower”, “left”, “rear”, “right”, “front”, “vertical”, “horizontal”, and derivatives thereof shall relate to the invention as oriented in. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background, brief summary or the following detailed description. It is also to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification, are simply exemplary embodiments of the inventive concepts defined in the appended claims. Hence, specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting, unless the claims expressly state otherwise.

Shown throughout the figures, the present invention provides a height-adjustable furniture leg, designed for diverse furniture applications. The furniture legincludes various structural components carefully configured to facilitate precise, convenient, and visually unobtrusive height adjustments.illustrates a front perspective view of the furniture legintegrated into a furniture article, demonstrating its secure attachment to a furniture framepositioned at a corner or edge of the furniture article. The furniture frameitself may form part of tables, desks, chairs, cabinets, or similarly structured furnishings. The furniture legextends vertically downward from the furniture frame, culminating in a robust load-bearing foot portion. The foot portionis strategically configured for optimal load distribution, providing stable support, preventing wobbling, and ensuring the furniture rests evenly and firmly on surfaces that may exhibit unevenness or irregularities.

depicts the furniture legin a front elevation view, clearly showing the leg in an extended position, indicative of the furniture leg's adjustable height capabilities. The furniture leg includes a durable and rigid basesecurely mounted beneath the furniture frame, providing an anchor point for the leg assembly. The basefeatures multiple pre-formed mounting holes, as best shown in, arranged circumferentially around its structure, specifically configured to accept fastening devices such as screws, bolts, or similar attachment hardware. These fasteners provide a secure and stable mechanical coupling between the furniture frameand the furniture leg. To ensure durability and adequate load-bearing capacity, the basemay be composed of robust materials, including but not limited to aluminum, steel, or various metallic alloys. Furthermore, the base's configuration facilitates the uniform distribution of structural loads across its contact surface, reducing potential stress concentrations that could negatively affect structural integrity or long-term stability.

The upper portion of the furniture legis connected to the basevia an adjustment mechanism, facilitating selective height adjustments. In, a callout identified as section A emphasizes the precise location of the adjustment mechanismat the juncture between the baseand the furniture leg's upper end. The adjustment mechanismmay encompass various mechanical configurations designed to enable height adjustments, such as threaded assemblies or telescoping arrangements. In a preferred embodiment, the adjustment mechanismemploys a threaded connection, allowing controlled rotational movement of the furniture legto vary its height incrementally. To enhance user convenience during adjustments, an exterior surface portion of the furniture legincorporates grip-enhancing textures or knurled patterns, promoting secure and ergonomic gripping during manual operation. This feature significantly improves user control and minimizes manual effort during rotational adjustment.

provides an enlarged detailed illustration of the adjustment mechanism, clarifying its structural relationship with both the baseand the furniture leg. The adjustment mechanismspecifically utilizes threading, facilitating controlled rotational engagement between the furniture legand the base. The threadingmay be precisely machined from materials exhibiting high durability and corrosion resistance, such as stainless steel or brass, thereby providing consistent and wear-resistant performance throughout numerous adjustment cycles. Additionally, the adjustment mechanismintegrates a locking mechanism, designed explicitly to prevent unintended height changes. The locking mechanismMay include detent systems, set screws, or friction-based arrangements, selectively engageable to secure the furniture legat specific, predetermined height positions. The locking mechanismensures that selected height settings remain stable under load conditions and throughout long-term furniture use.

offers a detailed bottom view of the furniture leg, clearly depicting the underside of the base. The symmetrical and circumferential arrangement of mounting holesaround the baseis visible, providing evenly distributed attachment points. This arrangement optimizes structural stability by evenly distributing attachment forces across the furniture frame, thereby reducing localized stress concentrations. Additionally, the base's underside features a smooth, flat finish, ensuring flush contact against the underside of the furniture frame. To further facilitate proper installation, the baseincludes integrated alignment features assisting users in consistently orienting multiple legs when installing them onto a furniture frame, improving uniformity across the furniture piece.

presents a detailed top view of the furniture leg, revealing internal features within the adjustment mechanism. This top perspective clearly illustrates the receiving cavitydesigned to engage with corresponding threaded portions located on the upper end of the furniture leg. The receiving cavityis manufactured to precise dimensional tolerances, ensuring smooth, friction-minimized engagement and disengagement cycles during height adjustments. Furthermore, internal geometries within the cavitysupport continuous and incremental height adjustments, facilitating precise leveling of the furniture frame. Internal axial guide structures within cavitymaintain proper alignment of threaded portions, preventing cross-threading and reducing component wear or frictional degradation during repeated adjustments.

illustrates a side elevation view, clearly defining the cylindrical profile and dual-component structure of the furniture leg. The leg structure incorporates an outer sleeveand an inner telescoping section. The outer sleeveoffers robust structural reinforcement and aesthetically pleasing concealment for internal mechanical components. The inner telescoping sectionis dimensioned precisely to slide smoothly and axially within the outer sleeve, directly enabling variable height adjustments. To maintain smooth telescoping action, internal guide features within the outer sleeverestrict lateral movement of the telescoping section. Both the outer sleeveand telescoping sectionare preferably fabricated from high-strength metal materials, such as aluminum or stainless steel, ensuring prolonged durability and reliable structural integrity even under repeated adjustment cycles.

provides a detailed perspective view of the upper region of the furniture leg, explicitly showing the integration between base, mounting holes, and outer sleeve. The external surface of outer sleeveis enhanced by grip-enhancing textures or knurled patterns, ergonomically designed to improve comfort, reduce slipping, and facilitate secure manual rotation. Additionally, the outer sleeveexhibits a streamlined, aesthetically modern appearance, complementing contemporary furniture designs. Meticulous integration between the baseand the outer sleeveminimizes visible seams or structural discontinuities, thereby promoting visual harmony and aesthetic coherence from typical viewing angles.

illustrates an exploded perspective view, clearly depicting the detailed assembly order of key components, including the base, threaded connection, locking mechanism, outer sleeve, telescoping section, and foot portion. The foot portion, fabricated from resilient materials such as rubber, silicone, or durable plastics, uniformly distributes the furniture's weight, minimizing risks of surface indentation or damage. Moreover, the foot portionis designed for interchangeability, allowing users to select specific foot types compatible with different floor surfaces, thereby increasing adaptability and versatility of the furniture legin diverse usage environments.

illustrates the furniture legfully integrated into a corner support structure, demonstrating structural compatibility with standard furniture frames. The corner structureincludes reinforcing brackets or support plates enhancing mechanical strength and load-bearing capacity, beneficial in dynamic or high-load scenarios. This integration clearly demonstrates adaptability and versatility, providing straightforward installation and maintenance possibilities across varied furniture configurations and structural contexts.

presents an inverted perspective view, highlighting seamless integration of furniture legwithin the corner structure. An overlapping flangeextends from the base, concealing the adjustment-related seams. Flangeautomatically repositions relative to sleeveduring height adjustments, consistently covering visual discontinuities. Manufactured from flexible elastomers or resilient plastics, flangereliably functions throughout repeated height adjustment cycles without deformation or compromise in performance.

In another implementation of the present invention, a method for adjusting the height of the furniture legis provided. The method initially involves preparing the furniture legfor attachment to the furniture frameby aligning the pre-formed mounting holesof the basewith corresponding attachment points beneath the furniture frame. Proper alignment ensures consistent orientation and optimal load distribution across the base. After alignment, fasteners, such as screws, bolts, or similar attachment hardware, are inserted through the mounting holesand tightened securely into the furniture frame. Ensuring the fasteners are properly tightened provides a rigid, stable coupling between the furniture legand furniture frame, creating a secure platform for subsequent height adjustments. During this attachment process, the smooth underside of the baseachieves flush contact with the furniture frame, further enhancing stability.

Once the baseis securely affixed, height adjustment of the furniture legmay commence. A user initiates this adjustment by manually gripping the outer sleeve, which includes grip-enhancing surface textures or knurled patternsto facilitate secure manual operation. Upon gripping, the user rotates the outer sleeveeither clockwise or counterclockwise, depending on whether an increase or decrease in leg height is desired. This rotation directly engages the threadingof the adjustment mechanismpositioned at the interface between the baseand the upper portion of the furniture leg. Rotation in one direction causes threadingengagement, extending the telescoping sectionoutward from the outer sleeve, thereby increasing leg height. Conversely, rotation in the opposite direction retracts the telescoping section, reducing the overall height. The precise control provided by threadingallows for continuous, incremental height adjustments tailored to the exact leveling requirements of the furniture frame.

Following height selection, the user engages the locking mechanism, configured to stabilize the furniture legat the chosen height position. Locking mechanismmay comprise a detent system with defined positional intervals, a frictional locking device, or a set screw arrangement. If a detent system is utilized, users experience tactile feedback indicating that the leg has reached a predetermined height increment, ensuring consistent adjustment across multiple legs. Upon engagement, the locking mechanismprevents unintended height changes due to vibrations, incidental contact, or normal use. Additionally, the user retains the ability to disengage and subsequently re-engage locking mechanismat any time, allowing further adjustments as required by changes in furniture placement or floor conditions. The reliability and convenience afforded by the locking mechanismprovide stability over extended periods without frequent maintenance.

During rotational height adjustments, the overlapping flange, positioned at the interface of the baseand the outer sleeve, automatically repositions to conceal the resulting parting seam. Composed of flexible elastomers or resilient plastics, the flangemoves smoothly and automatically, maintaining continuous concealment of any seam created by leg extension or retraction. The flexible composition of the flangeensures consistent performance without interfering with smooth height adjustment operations, even after repeated cycles of extension and retraction. This automatic repositioning capability maintains a seamless and aesthetically pleasing appearance of the furniture legfrom normal viewing perspectives. Consequently, users are not required to perform additional steps to conceal or blend adjustable components following height adjustments, further enhancing the convenience and aesthetic appeal of the furniture leg.