Length adjustable level

Abstract

An adjustable level is provided, comprising: a body member extending along a longitudinal axis, a first body portion coupled to the body member, a second body portion slidably coupled to the body member, a level sensing device, and a brake structure including an engagement surface engaging with a surface of the body member, wherein an engagement between the engagement surface and the body member biases the second body portion to remain stationary relative to the first body portion, the relative positions of the first body portion and the second body portion defining a fully retracted position and a fully extended position, the fully retracted position defining a minimum working length of the level along the longitudinal axis, and the fully extended position defining a maximum working length of the level along the longitudinal axis.

Description

[0001] This application is a divisional application of the invention patent application filed on February 26, 2019, with application number 201980026816.2 and invention title "Adjustable Length Level".

[0002] Cross-references to related applications

[0003] This application claims priority to U.S. Application No. 62 / 635,922, filed February 27, 2018, entitled “Length Adjustable Level,” the entire contents of which are incorporated herein by reference. Background Technology

[0004] This invention generally relates to the field of tools. Specifically, it relates to tools such as levels or spirit levels, which are extendable so that their length can be adjusted by the user as needed. For example, a level is used to determine the levelness of a structure, surface, or workpiece. In use, the level is placed on or in contact with the surface to be measured, and the user observes the position of the bubble in the bottle (or other level indicator) relative to a mark indicating the levelness of the structure, surface, or workpiece. Summary of the Invention

[0005] One embodiment of the present invention relates to a level configured to have an adjustable longitudinal length. The level includes: a fixed outer body member coupled to an inner body member at a fixed position; and a slidable outer body member slidably coupled to the inner body member and opposite the fixed outer body member. The level includes a locking mechanism movable between a locked position and an unlocked position, in which the slidable outer body member is locked relative to the inner body member, and in the unlocked position, the slidable outer body member is movable relative to the inner body member.

[0006] In various embodiments, the locking mechanism includes a user-operated control. This user-operated control is configured such that translational (or non-rotational) movement of the control moves the locking mechanism between a locked position and an unlocked position. In certain embodiments, the translational movement is parallel to one or more working surfaces of the level.

[0007] In various embodiments, when viewed along a longitudinal cross-section, the slidable outer body member has: a vertically extending central wall; an upper wall defining an upper working surface at the upper end of the central wall; and a lower wall structure extending from the lower end of the central wall, thereby defining a longitudinally extending cavity. An inner body member is received within the longitudinally extending cavity. In certain embodiments, when viewed along a longitudinal cross-section, the lower wall structure completely surrounds the inner body member at at least some cross-sectional locations. A locking mechanism is supported by the slidable outer body member located within an opening extending through the central wall. In various embodiments, when the level is in a fully retracted (e.g., minimum length) position, the locking mechanism can be accessed from the left and right surfaces of the level.

[0008] In one embodiment, the level includes an inner body member extending along a longitudinal axis, a first body portion coupled to the inner body member, a second body portion slidably coupled to the inner body member, a level sensing device, and a locking mechanism coupled to the second body portion. The first body portion includes a flat first base surface and a first top surface opposite the base surface. The second body portion includes a flat second base surface coplanar with the first base surface and a second top surface coplanar with the first top surface. The first and second base surfaces together define a working base surface, and the first and second top surfaces together define a working top surface. The locking mechanism includes a user-actuated control, wherein a translational movement of the user-actuated control moves the locking mechanism between a locked position and an unlocked position. The relative positions of the first and second body portions define a fully retracted position and a fully extended position, the fully retracted position defining the shortest working length of the level along the longitudinal axis, and the fully extended position defining the longest working length of the level along the longitudinal axis.

[0009] In another embodiment, the level includes: a fixed body member, an elongated body member extending along a longitudinal axis, a slidable body member slidably coupled to a second end of the elongated body member, an orientation measuring component, and a locking mechanism. The fixed body member is coupled to the first end of the elongated body member and includes a flat first base surface and a first top surface opposite the base surface. The slidable body member includes: a flat second base surface coplanar with the flat first base surface, the first and second base surfaces jointly defining a working base surface; and a second top surface coplanar with the first top surface, the first and second top surfaces jointly defining a working top surface. The locking mechanism includes a user-actuated control, wherein movement of the user-actuated control moves the locking mechanism between a locked position and an unlocked position. The relative positions of the fixed body member and the slidable body member define a fully retracted position and a fully extended position, the fully retracted position including the shortest working length of the level along the longitudinal axis, and the fully extended position including the longest working length of the level along the longitudinal axis. When the level is in the fully retracted position, the user-operated control of the locking mechanism is accessible to the user.

[0010] In another embodiment, the level includes: an inner body member extending along a longitudinal axis; a first body portion coupled to the inner body member; a second body portion slidably coupled to the inner body member; a level sensing device supported by the second body portion; and a locking mechanism. The first body portion includes a flat first base surface and a first top surface opposite the base surface. The second body portion includes: a flat second base surface coplanar with the flat first base surface, the first and second base surfaces jointly defining a working base surface; and a second top surface coplanar with the first top surface, the first and second top surfaces jointly defining a working top surface; a central wall; an upper wall defined to the second top surface, the upper wall being coupled to an upper end of the central wall; and a box-shaped structure coupled to a lower end of the central wall and defining a channel for receiving the inner body member. A user-actuated control is coupled to the central wall of the second body member and configured such that movement of the user-actuated control moves the locking mechanism between a locked position and an unlocked position. The relative positions of the first body part and the second body part define a fully retracted position and a fully extended position. The fully retracted position includes the shortest working length of the level along the longitudinal axis, and the fully extended position includes the longest working length of the level along the longitudinal axis.

[0011] In various embodiments, the level includes an adjustable friction mechanism supported by a slidable outer body member, which applies an adjustable amount of friction to an inner body member.

[0012] Additional features and advantages will be set forth in the following detailed description, and these additional features and advantages will be apparent in part to those skilled in the art from this description, or will be recognized by practice as described in the written description, its claims, and the accompanying drawings. It should be understood that the foregoing general description and the following detailed description are exemplary.

[0013] The accompanying drawings are included to provide further understanding, and are incorporated in and form a part of this specification. The drawings illustrate one or more embodiments, and together with the description, serve to explain the principles and operation of the various embodiments. Attached Figure Description

[0014] Figure 1 This is a perspective view of a level according to an exemplary embodiment.

[0015] Figure 2A According to an exemplary implementation Figure 1 A cross-sectional side view of a level, showing the locking mechanism.

[0016] Figure 2B According to an exemplary implementation Figure 2A A 3D view of the locking mechanism, in which the locking mechanism frame has been removed.

[0017] Figure 3 According to an exemplary implementation Figure 1 A longitudinal cross-sectional view of a level.

[0018] Figure 4 This is a longitudinal cross-sectional view of the external body portion of the level according to another exemplary embodiment.

[0019] Figure 5 This is a cross-sectional side view of a level and locking mechanism in the unlocked position according to another exemplary embodiment.

[0020] Figure 6 It is in the locked position according to another exemplary embodiment. Figure 5 A cross-sectional side view of the level and locking mechanism.

[0021] Figure 7 This is a cross-sectional side view of a level and locking mechanism in the unlocked position according to another exemplary embodiment.

[0022] Figure 8 It is in the locked position according to another exemplary embodiment. Figure 7 A cross-sectional side view of the level and locking mechanism.

[0023] Figure 9This is a longitudinal cross-sectional view of the external body portion of the level according to another exemplary embodiment.

[0024] Figure 10A According to the exemplary implementation method Figure 9 A longitudinal cross-sectional view of the level and locking mechanism in the unlocked position within the main body.

[0025] Figure 10B According to an exemplary implementation Figure 10A Side view of the level and locking mechanism.

[0026] Figure 11A According to the exemplary implementation method Figure 9 The main body part is in a locked position Figure 10A Longitudinal cross-sectional view of the level and locking mechanism.

[0027] Figure 11B According to an exemplary implementation Figure 11A Side view of the level and locking mechanism.

[0028] Figure 12 This is a longitudinal cross-sectional view of the external body portion of the level according to another exemplary embodiment.

[0029] Figure 13A According to the exemplary implementation method Figure 12 A longitudinal cross-sectional view of the level and locking mechanism in the unlocked position within the main body.

[0030] Figure 13B According to an exemplary implementation Figure 13A Side view of the level and locking mechanism.

[0031] Figure 14A It is in the locked position according to the exemplary embodiment. Figure 13A Longitudinal cross-sectional view of the level and locking mechanism.

[0032] Figure 14B According to an exemplary implementation Figure 14A Side view of the level and locking mechanism.

[0033] Figure 15 This is a detailed perspective view of a friction member for an extendable level according to an exemplary embodiment.

[0034] Figure 16 This is a perspective view of a locking mechanism and friction element for an extendable level according to another exemplary embodiment.

[0035] Figure 17 According to an exemplary implementation Figure 16Side view of the locking mechanism.

[0036] Figure 18 According to an exemplary implementation Figure 16 Cross-sectional view of the friction element.

[0037] Figure 19 This is a perspective view of the internal body and rear bushing of an extendable level according to an exemplary embodiment.

[0038] Figure 20 It is located within the external body of the elongated level according to an exemplary embodiment. Figure 19 Cross-sectional view of the internal body and rear bushing.

[0039] Figure 21 This is a perspective view of the internal body and front bushing of an extendable level according to an exemplary embodiment.

[0040] Figure 22 According to an exemplary implementation Figure 21 Exploded view of the front bushing.

[0041] Figure 23 This is a perspective view of the outer body of an extendable level including a front bushing, according to another exemplary embodiment.

[0042] Figure 24 According to an exemplary implementation Figure 23 A three-dimensional view of the front bushing.

[0043] Figure 25 This is a perspective view of a support for an extendable level according to an exemplary embodiment.

[0044] Figure 26 It is the fixed body portion of the extendable level, according to an exemplary embodiment. Figure 25 Side view of the support.

[0045] Figure 27 This refers to the process, according to an exemplary embodiment, before or after installation onto the fixed body portion of the extendable level. Figure 26 Side view of the support.

[0046] Figure 28 This is an exploded perspective view of a level bottle assembly for an extendable level according to an exemplary embodiment.

[0047] Figure 29 This is an exploded perspective view of a dual level bottle assembly for an extendable level according to an exemplary embodiment. Detailed Implementation

[0048] Referring generally to the accompanying drawings, various embodiments of a level, such as a spirit level, are shown. Typically, a level has one or more precision surfaces for engaging with a workpiece during leveling. The levels discussed herein are designed so that their length can be adjusted by the user according to the needs of various leveling applications. As will be discussed in more detail below, the applicant has developed a locking system that allows the user to lock the level at a desired length, which the applicant believes provides a more effective and robust locking mechanism than conventional extended levels.

[0049] For example, the applicant's locking mechanism provides a large engagement surface that engages with the internal body portion when the level is locked at the desired length. The applicant has found that by using a locking mechanism with a large engagement surface, the locking force is uniformly distributed over a large area, which limits the possibility of accurately measuring surface distortion or misalignment when the locking force is applied. Additionally, in certain embodiments, the locking mechanism is designed such that the translational movement (opposite to rotational movement) of a user-actuated control is used to move the locking mechanism to the locked position. The applicant believes that translational movement is easier to operate and contributes to the uniform application and distribution of the locking force compared to rotary or lever-type locking controls.

[0050] Furthermore, in various embodiments, the locking mechanism includes additional design aspects that the applicant believes improve the functionality of the extendable level discussed herein. For example, the external level body profile and the user-actuated control for the locking mechanism are designed such that the user can always access the user-actuated control for the locking mechanism, and particularly when the level is in the fully retracted position, when the level is in the fully extended position, and in any position in between. Specifically, by allowing the user to access the locking mechanism control when the level is in the fully retracted position, the locking mechanism discussed herein allows the level to be locked in the fully retracted position.

[0051] Furthermore, in various embodiments, the control element for the locking mechanism is arranged along the level body to be separated from the gap or interval created between the level and the opposite portion of the outer level body when the level is in the extended position. Therefore, this design eliminates the need for the user's fingers to be placed in this gap to actuate the locking mechanism, reducing the chance of the user's fingers being caught between the portions of the outer level body.

[0052] Furthermore, in various embodiments, the external level body includes an upper portion having an I-beam cross-sectional profile and a lower portion defining a hollow region, within which an internal body member is located. This body shape provides easy gripping / manipulation along the upper I-beam wall throughout the entire length of the extended level, while also providing an internally received telescopic internal body member. The applicant argues that conventional extended levels do not offer this combination of design features. Moreover, this external body design allows a user-actuated control for the locking mechanism to be positioned through the vertical wall of the I-beam structure, such that the user-actuated control is accessible from either side of the level in both its fully retracted and fully extended positions.

[0053] In various embodiments, the locking mechanism includes a friction member that ensures a certain degree of friction between the locking mechanism and the inner body member, even when the locking mechanism is in the unlocked position. This friction is used to control the movement of the inner body member as it slides into or out of the outer body member when the locking mechanism is in the unlocked position. In certain embodiments, the amount of friction provided by the friction member can be adjusted by the user, allowing the user to select the ease with which the outer body member slides relative to the inner body member. The friction mechanism prevents / limits rapid and / or unintentional sliding between the two leveling components when the locking mechanism is unlocked, and assists the locking mechanism in limiting movement when the locking mechanism is in the locked position.

[0054] Reference Figure 1 The illustration shows an extendable, expandable, or length-adjustable level, such as level 10, according to an exemplary embodiment. Typically, level 10 is extendable, and its length is reversibly adjustable, thereby allowing the user to increase and decrease the length of level 10 as needed for various applications.

[0055] Typically, the level 10 includes an outer body 12, which includes a base surface 14 and an opposite top surface 16. The base surface 14 and top surface 16 are flat planar surfaces that can be used to engage the surfaces of workpieces measured using the level 10. In certain embodiments, after the outer body 12 is formed (e.g., after extruding the metal forming the outer body 12), the base surface 14 and / or top surface 16 are machined to have flat, flush, or planar surfaces, and in some embodiments, the machined surface may be anodized. Surfaces 14 and 16 may be referred to as the working surfaces of the level 10. Surfaces 14 and 16 are planar surfaces that are parallel to each other and also parallel to the longitudinal axis 18 of the level 10.

[0056] The outer body 12 includes a first body portion and a second body portion. The first body portion is shown as a fixed portion 20, also referred to as a fixed body member 20. The second body portion is shown as a slidable portion 22, also referred to as a slidable body member 22. Typically, the fixed portion 20 is rigidly and / or permanently coupled to the inner body 24 at a first end 21 of the level 10, and the slidable portion 22 slidably engages the inner body 24. The slidable portion 22 defines a second end 23 of the level 10, located at the end of the slidable body member 22 opposite to the fixed portion 20. Typically, to extend the level 10, the slidable portion 22 moves away from the fixed portion 20 along the longitudinal axis 18 of the inner body 24, also referred to as the elongated body member 24, and to retract / contract the level 10, the slidable portion 22 is moved towards the fixed portion 20 along the inner body 24.

[0057] In some embodiments, the inner body 24 is sized such that its entire length fits within the sliding portion 22. Therefore, when the level 10 is moved to the fully retracted or closed position, the inward-facing edge 28 of the fixed portion 20 abuts the inward-facing edge 26 of the sliding portion 22. In this fully retracted position, the fixed portion 20 and the sliding portion 22 together completely cover the inner body 24.

[0058] Reference Figure 1 The level 10 includes a plurality of holes formed in the slidable body portion 22. For example... Figure 1 As shown, the level 10 includes a first bottle opening 30, a second bottle opening 32, and a handle opening 36 formed by a slidable portion 22 passing through the outer body 12. Openings 30 and 32 each receive a level sensing device, shown as a level bottle 34 (e.g., a bubble bottle, alcohol bottle, etc.), which is supported by the slidable body portion 22 in a suitable orientation relative to surfaces 14 and / or 16, so that these bottles indicate the angle, levelness, perpendicularity, etc., of the corresponding surface of a workpiece according to the needs of a specific level design or level type. It should be understood that the level 10 may include fewer than or more than two level bottles, which may be desirable for a particular level design. Furthermore, the level 10 may be equipped with other orientation measuring components, level sensing, and indicating devices besides alcohol level bottles. For example, instead of or in addition to level bottles 34, the level 10 may be equipped with a digital / electronic level sensor and display.

[0059] To enable the level 10 to provide a flat working surface at all lengths, the upper and lower surfaces of the fixed portion 20 and the sliding portion 22 are coplanar. Specifically, the fixed portion 20 includes an upper surface 40 and a lower surface 42, and the sliding portion 22 includes an upper surface 44 and a lower surface 46. The upper surface 40 is coplanar with the upper surface 44, and / or the lower surface 42 is coplanar with the lower surface 46. In this arrangement, the upper surface 40 and the upper surface 44 operate together to provide a top working surface 16 of the level 10 at all adjustable lengths, from fully extended to fully retracted.

[0060] Similarly, lower surfaces 42 and 46 operate together to provide the base surface 14 of the level 10 at all adjustable lengths from its fully extended to its fully retracted position, wherein the fully retracted position comprises the shortest working length of the level along its longitudinal axis, and the fully extended position comprises the longest working length of the level along its longitudinal axis. Unlike standard fixed-length levels with a single integral body defining a working surface, a challenge with expandable levels lies in the ability to maintain the coplanarity of the working surfaces on opposing external body sections while providing a robust and easy-to-use locking mechanism. The locking mechanism and / or frame design discussed here, as will be discussed in more detail below, is considered to address both of these potential design challenges.

[0061] Reference Figures 1 to 3 In addition to the holes for the bottle and handle, the level 10 also includes an opening 38 formed through the slidable portion 22, which receives a locking mechanism 50. The locking mechanism 50 includes a user-actuated control, shown as a slider 52, and a locking mechanism frame 54. Typically, the slider 52 is a user-operated control mechanism that moves the locking mechanism between a locked position and an unlocked position. In the locked position, the engagement member engages the inner body member 24, thereby securing the slidable body portion 22 to the inner body member 24, which also secures the sliding body member 22 relative to the fixed body member 20. This mechanism allows the user to set the longitudinal length of the level 10 as needed. In various embodiments, the slider 52 is at least partially arranged within the opening 38.

[0062] like Figure 3 As shown, the locking mechanism frame 54 includes a left portion 56 and a right portion 58, which are connected to the slidable body portion 22 and support the various components of the locking mechanism 50 relative to the slidable body portion 22. In this arrangement, the left portion 56 and the right portion 58 are attached to the outer surface of the slidable body portion 22 and support the components of the locking mechanism 50 in place within the opening 38.

[0063] Unlike at least some extended level designs that utilize lever-based locking mechanisms, the locking mechanism 50 is configured such that translational or linear movement of the slider 52 causes the locking mechanism 50 to move between a locked position and an unlocked position. Figure 2A and Figure 2B In the arrangement of the locking mechanism 50 shown, the translational movement of the slider 52 in a direction parallel to at least one of the working surfaces 14 and 16 causes the locking mechanism 50 to engage / disengage.

[0064] Reference Figure 2A and Figure 2B The structure and operation of the locking mechanism 50 are shown in more detail. The locking mechanism 50 includes a brake structure 60, also referred to as a braking structure 60. The brake structure 60 includes a lower engagement surface 62 and an angled upper surface 64. When in the locked position, the lower engagement surface 62 provides frictional engagement (directly or indirectly) with the upper surface of the inner body member 24. When the locking mechanism 50 is in the locked position, this frictional engagement holds the slidable body member 22 in place relative to the inner body member 24.

[0065] The locking mechanism 50 includes an opposing ramp structure 66 coupled to the slider 52, and the ramp structure 66 engages with the brake structure 60 along an angled upper surface 64. Through the interaction of the angle of the ramp structure 66 and the angled upper surface 64 of the brake structure 60, the horizontal movement of the slider 52 is converted into vertical movement of the brake structure 60 relative to the inner body member 24. Therefore, when the slider 52 moves in a first direction (e.g., horizontally translating away from the fixed outer body portion 20), the brake structure 60 is pulled upward away from the inner body portion 24 to the unlocked position. In the unlocked position, this movement causes the brake engagement surface 62 to disengage from the inner body portion 24, and the slidable body portion 22 is allowed to slide along the inner body portion 24. When the slider 52 moves in a second direction (e.g., horizontally translating toward the fixed outer body portion 20), the brake structure 60 is pushed downward toward the inner body portion 24 to the locked position. In the locked position, the brake engagement surface 62 is pressed into frictional engagement with the inner body portion 24, so that the slidable body portion 22 is fixed in place relative to the inner body portion 24.

[0066] As will be understood, the consistent application of locking force by locking mechanism 50 allows for consistent coplanar alignment of the working surfaces of body portions 20 and 22 when in the locked position. Compared to other locking mechanisms in existing expandable level designs utilizing screw-type or lever-type locking mechanisms, the applicant believes that the designed locking mechanism 50 provides improved leveling accuracy when in the locked position. In particular, the relatively large brake engagement surface 62 distributes the required frictional locking force over a larger area, which in turn limits deformation of the working surface of level 10 that might otherwise occur in other locking member designs.

[0067] like Figure 2A As best shown, the length L1 of the mating surface 62 is relatively large, particularly compared to the longitudinal length of the level 10. In various embodiments, L1 is between 30 mm and 300 mm, specifically between 50 mm and 150 mm, and more specifically between 70 mm and 90 mm, and even more specifically between 80 mm and 85 mm, and even more specifically 82.7 mm. In various other embodiments, L1 is at least 30 mm, at least 50 mm, or at least 70 mm. In certain embodiments, the ratio of L1 to the minimum length (i.e., the fully retracted length) of the level 10 is between 1:10 and 1:30, and more specifically between 1:15 and 1:30, and even more specifically 14.74:1 or 23.96:1. In certain embodiments, the ratio of L1 to the maximum length (i.e., the fully extended length) of the level 10 is between 1:15 and 1:50, more specifically between 1:20 and 1:40, and even more specifically 1:23.96 or 1:44.23. The applicant believes that the dimensions of L1 and the ratios of L1 discussed above represent a large engagement contact area, which results in smaller deformation, particularly compared to other locking mechanisms with smaller contact surfaces, such as lever-type clamping mechanisms.

[0068] The relatively large size of the mating surface 62 can also be expressed in terms of its area. In various embodiments, the area of ​​the mating surface 62 is 500 mm². 2 With 3000mm 2 Between, especially at 800mm 2 With 1500mm 2 Between, more specifically within 1000mm 2 With 1400mm 2 Between, more specifically at 1200mm 2 With 1400mm 2 Between, and more specifically 1348mm 2 In various other embodiments, the area of ​​the mating surface 62 is at least 500 mm². 2At least 800mm 2 Or at least 1000mm 2 The applicant believes that by increasing the size of the engagement surface 62, and in particular increasing the length of the engagement surface 62, the possibility of the internal body member 24 bending around the contact point that contacts the brake engagement surface is reduced by holding the internal body member 24 in a cantilevered manner from the locking engagement area.

[0069] Reference Figure 3 The design of the level body, particularly the body parts 20 and 22 of the level 10, is shown. For example... Figure 3 The diagram shows a longitudinal cross-sectional view of a slidable body portion 22 according to an exemplary embodiment. Typically, the slidable body portion 22 includes an upper portion similar to an I-beam level and a lower portion defining a channel for receiving an inner body portion 24.

[0070] Specifically, the slidable body portion 22 includes an upper wall 70 that defines a top working surface 16 located at the upper end of a generally vertical wall or web, shown as wall 72. The applicant believes that the upper wall 70 provides an easily held structure positioned along the entire upper end of the level 10.

[0071] The box-shaped structure 74 is located at the lower end of the wall 72 and includes an inner surface defining the channel 76 and a lower wall defining the base surface 14. In this arrangement, the wall 78 defining the box-shaped structure 74 is a closed, continuous wall surrounding and defining the channel 76 (at least at certain locations along the length of the level 10). Figure 2A and Figure 3 As can be observed, the channel 76 slidably receives the inner body member 24, thereby allowing the slidable body member 22 to be moved along the inner body member 24 during length adjustment. The applicant believes that a robust connection (at least compared to the partial engagement of track-type structures present in some prior art designs) is provided between the inner body member 24 and the slidable body member 22 by surrounding the inner body member 24 with a box-shaped structure 74 to provide a telescopic engagement of the level. It should be noted that in at least some embodiments, the fixed level body portion 20 has the same frame shape as the slidable body member 22 discussed above.

[0072] Furthermore, unlike some conventional extended level designs, this frame shape allows for the positioning of the slider 52 and makes it easily accessible (e.g., a locking mechanism control). Figure 1 and Figure 3As shown, opening 38 extends through vertical wall 72, and slider 52 is positioned within and extends through opening 38. In this arrangement, since slider 52 is not located within the cavity of the level body, the user can access slider 52 in any extended or retracted position (including the fully retracted position). Furthermore, in this arrangement, slider 52 can be accessed from either side of the level 10, thereby allowing the user to conveniently move the level 10 between locked and unlocked positions from either side.

[0073] like Figure 2A and Figure 2B As shown, in various embodiments, the level 10 includes a friction element, shown as an adjustable friction element 80. Typically, when the locking mechanism 50 is in the unlocked position, the friction element 80 is positioned to contact the inner body member 24 to provide a constant but relatively low level of friction to control the sliding of the slidable body member 22 relative to the inner body member 24. By providing a low level of friction, the friction element 80 increases the amount of force that must be applied to make the slidable body member 22 slide along the inner body member 24. This constant friction reduces the chance of accidental movement of the slidable body member 22. In certain embodiments, the friction element 80 can be adjusted via an adjustment control (e.g., via a screw 82 or other mechanism) that allows the user to adjust the amount of friction applied by the friction element 80, which in turn allows the user to adjust the degree of freedom of the slidable body member 22 to slide relative to the inner body member 24. In various embodiments, the friction element 80 includes an engagement surface 84, and the position of the engagement surface 84 relative to the opposing surface of the inner body member 24 is adjusted via a screw 82. The operation of screw 82 causes the mating surface 84 to move toward the inner body member 24 to increase friction, and causes the mating surface 84 to move away from the inner body member 24 to reduce friction.

[0074] In the illustrated embodiment, the friction element 80 is supported by a locking mechanism frame 54 adjacent to the brake structure 60. In a particular embodiment, the friction element 80 is separated from the locking mechanism 50 (e.g., separated from the brake member 60 and capable of being adjusted independently) and located between the locking mechanism 50 and the central level bottle 34.

[0075] Reference Figure 4The diagram illustrates a sliding level body 100 according to another exemplary embodiment. Apart from the differences discussed herein, the sliding level body 100 is substantially the same as the sliding level body portion 22 described above. The level body 100 includes a pair of opposing inner arms 102 located within a channel 76. In this embodiment, the lower surface of the inner body member 24 engages with the arms 102. In some such embodiments, the arms 102 prevent direct engagement between the inner body member 24 and the lower wall defining the base surface 14. In at least some embodiments, this arrangement can reduce / limit the possibility of deformation of the base surface 14 when force is applied during locking of the locking mechanism.

[0076] Additionally, the level body 100 includes a pair of angled walls 104 extending from the central wall 72 to engage the upper wall 70. In this way, an upper cavity 106 is defined between the walls 104, the central wall 72, and the upper wall 70, at the upper end of the central wall 72. Due to the structural support provided by the angled walls 104, this arrangement allows for a reduction in the total thickness and amount of metal used for the upper wall 70.

[0077] Reference Figure 5 and Figure 6 This illustrates a locking mechanism 110 for an extendable level, such as a level 10, according to another exemplary embodiment. Except for the differences discussed herein, the locking mechanism 110 is substantially the same as the locking mechanism 50 discussed above. Figure 5 The locking mechanism 110 is shown in the unlocked position, while Figure 6 The locking mechanism 110 in the locked position is shown. The locking mechanism 110 includes an adjustable friction element 112 extending through the brake element 60. The operation of the adjustable friction element 112 is the same as that of the friction element 80 described above. As shown, an adjusting screw 114, which changes the amount of friction applied by the friction element 112, is located within an aperture 116 defined within the slider 52 and is accessible within the aperture 116. Furthermore, the friction element 112 is coupled to the slider 52 such that when the locking mechanism 110 moves between the locked and unlocked positions, the friction element 112 moves with the slider 52.

[0078] Reference Figure 7 and Figure 8 This illustrates a locking mechanism 120 for an extendable level, such as a level 10, according to another exemplary embodiment. Except for the differences discussed herein, the locking mechanism 120 is substantially the same as the locking mechanism 50 discussed above. Figure 7 The locking mechanism 120 is shown in the unlocked position, while Figure 8Locking mechanism 120 in the locked position is shown. Locking mechanism 120 includes a plurality of braking elements shown as pivot cam 122. When slider 52 moves from the unlocked position to the locked position, pivot cam 122 pivots to engage with the upper surface of inner body member 24, thereby causing slider 52 to lock in place relative to inner body member 24. Similar to locking mechanism 110, locking mechanism 120 includes an adjustable friction element 112 coupled to slider 52 and accessible through orifice 116.

[0079] Reference Figures 9 to 1 1. A locking mechanism 130 and an associated sliding body member 132 according to an exemplary embodiment are shown. Except for the differences discussed herein, the sliding body member 132 is substantially the same as the sliding level body portion 22 described above. Except for the differences discussed herein, the locking mechanism 130 is substantially the same as the locking mechanism 50 discussed above.

[0080] The slidable body member 132 is a box-shaped level body having a single continuous wall structure 134 that defines an internal cavity 136 accommodating both the internal body member 24 and the locking mechanism 130. The wall structure 134 defines a plurality of outwardly extending portions 138. As shown in Figures 10 and 11, the outwardly extending portions 138 provide non-vertical surfaces that serve as tracks for supporting the locking mechanism 130 and for guiding the internal body member 24 within the slidable body member 132.

[0081] Figure 10A and Figure 10B The locking mechanism 130 is shown in the unlocked position, while Figure 11A and Figure 11B The locking mechanism 130 in the locked position is shown. Typically, the locking mechanism 130 includes a brake structure 140 with an angled engagement surface 142, and in this embodiment, the inner body member 24 includes a channel structure having opposing, upwardly and laterally angled surfaces 144. The locking mechanism 130 is configured such that when the slider 52 moves to the locked position, the movement of the slider 52 pushes the engagement surface 142 of the brake structure 140 laterally outward and engages it with the angled surface 144 of the inner body member 24. In this embodiment, the locking force applied by the locking mechanism 130 is directed entirely or partially along a horizontal direction coplanar with the base surface 14 towards the vertical sidewall of the level body 132, which reduces the possibility of deformation / misalignment of the working surfaces 14 and / or 16 of the level 10 during the application of the locking force.

[0082] Reference Figures 12 to 14. A locking mechanism 150 and an associated slidable body member 152 according to an exemplary embodiment are shown. Except for the differences discussed herein, the slidable body member 152 is substantially the same as the slidable body member 22 described above. Except for the differences discussed herein, the locking mechanism 150 is substantially the same as the locking mechanism 50 discussed above.

[0083] The sliding body member 152 is a box-shaped level body having a single continuous wall structure 154 that defines an internal cavity 156 accommodating the internal body member 24 and the locking mechanism 150. The wall structure 154 is shaped such that the internal cavity 156 has a generally rectangular cross-sectional shape.

[0084] Figure 13A and Figure 13B The locking mechanism 150 is shown in the unlocked position, while Figure 14A and Figure 14B The locking mechanism 150 in the locked position is shown. Typically, the locking mechanism 150 includes a brake structure 160 with an angled engagement surface 162, and in this embodiment, the inner body member 24 includes a tapered upper end with opposing, upwardly and laterally outwardly angled surfaces 164. The locking mechanism 150 is configured such that when the slider 52 moves to the locked position, the movement of the slider 52 pulls the engagement surface 162 of the brake structure 160 laterally inward and engages it with the angled surface 164 of the inner body member 24. Similar to the locking mechanism 130, the locking force applied by the locking mechanism 150 is oriented entirely or partially in the horizontal direction, which reduces the possibility of deformation / misalignment of the working surfaces 14 and / or 16 of the level 10 during the application of the locking force.

[0085] like Figure 15 As shown, the locking mechanism 150 includes an adjustable friction element 170 positioned adjacent to the locking mechanism 150. The operation of the adjustable friction element 170 is the same as that of the friction element 80 described above. As shown, the friction element 170 includes an adjustment control, shown as an adjusting screw 172, which changes the amount of friction applied by the friction element 112. Figure 13B and Figure 14B As best shown in the diagram, when the level is in the extended position, it can be positioned from the gap 174 between the body parts 22 and 20. Figure 1 (As shown in the diagram) Touch the adjusting screw 172.

[0086] In certain embodiments, the level body components discussed herein (e.g., fixed body portion 20, sliding body portion 22, and internal body portion 24) are all formed from hollow material parts, such as hollow metal parts (e.g., hollow aluminum extrusions). Furthermore, it should be understood that the terms vertical and horizontal as used herein refer to a reference axis, where horizontal is a plane parallel to the working surface of the level and vertical is a plane perpendicular to the working surface of the level.

[0087] Reference Figures 16 to 18 A locking mechanism 200 according to an exemplary embodiment is shown. Generally, locking mechanism 200 is identical to locking mechanism 50, except for the differences discussed herein. Locking mechanism 200 includes a user-actuated control, shown as a slider 202, supported by a locking mechanism frame 54. Locking mechanism 200 includes a brake structure 204. Brake structure 204 includes a pair of angled channels 206 and a lower engagement surface 208. Like the lower engagement surface 62, when in the locked position, the lower engagement surface 208 provides frictional engagement (directly or indirectly) with the upper surface of the inner body member 24. This frictional engagement holds the slidable body member 22 in place relative to the inner body member 24 when locking mechanism 50 is in the locked position.

[0088] The locking mechanism 200 includes an angled channel 206, which is connected to the slider 202 via a sliding post 210. Figure 17 As shown, the sliding post 210 extends horizontally away from the inner surface of the slider 202, such that the sliding post 210 is received in the angled channel 206. Through the interaction of the sliding post 210 and the angled channel 206 of the brake structure 204, the horizontal movement of the slider 202 is converted into vertical movement of the brake structure 204 relative to the inner body member 24. Therefore, when the slider 202 moves along the first direction (e.g., as...), Figure 16 As shown, when the horizontal translation moves away from the fixed outer body portion 20, the brake 204 is pulled upward away from the inner body portion 24 to the unlocked position. In the unlocked position, this movement causes the brake engagement surface 208 to disengage from the inner body portion 24, and the slidable body portion 22 is allowed to slide along the inner body portion 24. When the slider 202 moves in a second direction (e.g., horizontal translation towards the fixed outer body portion 20), the brake 204 is pushed downward toward the inner body portion 24 to the locked position. In the locked position, the brake engagement surface 208 is pressed into frictional engagement with the inner body portion 24, such that the slidable body portion 22 is fixed in place relative to the inner body portion 24.

[0089] Reference Figure 17The extended open portion 212 is located at the upper end of each angled channel 206 and includes an angled lower surface 213 and a recess 215 located within the angled lower surface 213. For example... Figure 17 As shown, the maximum height of the open portion 212 is greater than the maximum height of the channel 206. In this arrangement, when the brake structure 204 reaches the locked position, the open portion 212 allows the sliding post 210 to move downward a short distance. This movement provides a tactile and / or audible indication of reaching the locked position as the post 210 engages in the extended open portion 212.

[0090] In various embodiments, the materials used for brake structure 60 and / or brake structure 204 are selected to provide high-friction engagement with the upper surface of the inner body member 24. In certain embodiments, the lower portion of the defining engagement surface of the brake structure may be made of a compressible material and / or a material with a lower hardness than the rest of the brake structure, which facilitates high-friction engagement with the inner body member 24 when locked.

[0091] Further reference Figures 16 to 18 The diagram illustrates a friction element, shown as an adjustable friction element 220, according to an exemplary embodiment. Generally, the adjustable friction element 220 is identical to the adjustable friction element 80, except for the differences discussed herein. Like the friction element 80, the friction element 220 is adjustable via an adjustment control (e.g., via a screw 82 or other mechanism) that allows the user to adjust the amount of friction applied by the friction element 220, which in turn allows the user to adjust the degree of freedom of sliding of the slidable body member 22 relative to the inner body member 24.

[0092] like Figure 18 As best shown in the diagram, the friction element 220 includes two body portions, shown as a left body portion 222 and a right body portion 224. Body portions 222 and 224 have opposing and contacting vertically angled surfaces 226 and 228. In a particular embodiment, the angled surfaces 226 and 228 are... Figure 18 The orientation forms a 60-degree angle with respect to the horizontal plane. By operating the screw 82, the body parts 222 and 224 are pulled / pushed relative to each other, causing the lower mating surface 84 to move vertically relative to the upper surface of the inner body member 24, which in turn adjusts the amount of constant friction applied by the friction element 220.

[0093] In certain embodiments, body portions 222 and 224 are formed of a low-wear, relatively low-friction, and / or durable polymer material, such as polyoxymethylene polymer material, for example, Delrin, which can be obtained from DuPont. Furthermore, to facilitate fine-tuning of the amount of friction applied by the adjustable friction element 220, screw 82 may have a low-pitch thread, such that each rotation of screw 82 translates into a small adjustment in the vertical position of body portions 222 and 224.

[0094] Reference Figures 19 to 22 The extended level discussed herein may include an internal body component 24 and a defined channel 76 (see, for example...). Figure 4 One or more bushing structures between the inner surfaces of the slidable body member 22. In this embodiment, compared to an arrangement in which the outer surface of the body member 24 directly engages the inner surface of the slidable body member 22, the bushing structures can provide improved sliding via controlled friction and / or wear resistance.

[0095] In a particular embodiment, the front bushing structure and the rear bushing structure can be positioned about the inner body member 24 toward each end of the slidable body member 22. Specifically, Figure 19 and Figure 20 A rear bushing 230 is shown, which is located near one end of the inner body 24 within the channel 76, adjacent to the end bottle opening 32 and the end of the level body 23 (see...). Figure 1 Furthermore, Figure 21 and Figure 22 A front bushing 260 is shown, which is located at the other end of the inner body 24 within the channel 76, adjacent to / below the locking mechanism 50 (see...). Figure 1 ).

[0096] like Figure 19 and Figure 20 As shown, the rear bushing 230 includes an upper part 232 located outside the upper wall 234 of the inner body member 24 and a lower part 236 located outside the lower wall 238 of the inner body member 24. Typically, parts 232 and 236 are formed of a low-friction, low-abrasion polymer material, thereby providing a bushing function between the inner body member 24 and the slidable body member 22.

[0097] like Figure 20 As best shown, the upper sleeve or collar 240 is coupled to and extends downward from the upper bushing member 232, and the lower sleeve or collar 242 is coupled to and extends upward from the lower bushing member 236. Each of the collars 240 and 242 includes a sidewall structure shown as defining a cylindrical sidewall 246 for a cavity 248 or recess 248. Figure 20As shown, a cylindrical sidewall 246 extends through openings in walls 234 and 238 of the inner body member 24, and a biasing element, shown as spring 250, is located between collars 240 and 242. Spring 250 applies force between upper bushing member 232 and lower bushing member 236 to provide a high level of bushing contact with the inner surface of the slidable body member 22.

[0098] In addition to providing a high level of bushing contact, the applicant has found that the design of the rear bushing 230 provides a robust and fault-resistant arrangement, particularly suitable for tools frequently used in built environments. Specifically, the upper and lower ends of the spring 250 are received in an open central cavity 248 defined by collars 240 and 242, respectively. In this arrangement, compared to a pin-mounted arrangement, especially in terms of strain, the relatively large support contact area between the spring 250 and the collars 240 and 242 is less likely to fail.

[0099] Furthermore, in this arrangement, the end of the spring 250 is surrounded and captured within a collar 240, and the end of the spring 250 extends vertically through the two walls 234 and 238 of the inner body member 24 to engage with bushing members 232 and 236, respectively. The applicant believes that this arrangement provides a robust bushing structure (at least compared to bushing structures where the spring 250 is received on a pin structure). Specifically, even in the event of a break or crack forming between the collar 240 or 242 and the associated bushing member 232 or 236, the spring 250 is captured within the collar, and despite the crack, the capture of the collar within the opening extending through the inner body member and the biasing force of the spring 250 will tend to hold the bushing 230 together and in place.

[0100] Reference Figure 21 and Figure 22 The front bushing 260 is shown in detail. (See example...) Figure 21 As best shown, the front bushing 260 is coupled to the slidable body member 22 and surrounds the inner body member 24 below the locking mechanism 50. Typically, the front bushing 260 comprises a low-friction, low-abrasion polymer material and provides a bushing function between the inner body member 24 and the slidable body member 22, thereby facilitating the sliding of the inner body member 24 relative to the slidable body member 22.

[0101] In various embodiments, the front bushing 260 is formed by two separate parts, shown as a first segment 262 and a second segment 264. The upper portions of the first segment 262 and the second segment 264 abut at an angled interface 266 defining a gap 268. This angled interface 266 and gap 268 allow bending / compression during assembly, which allows the front bushing 260 to be inserted into the slidable body member 22, and the elasticity of the bushing material and / or the outward bias of the front bushing 260 provide a high level of contact between the outer surface of the front bushing 260 and the inner surface of the defined channel 76 of the slidable body member 22.

[0102] The front bushing 260 includes one or more posts shown as hexagonal nails 270. In this embodiment, the hexagonal nails 270 are received through openings 272 formed through the sidewalls of the slidable body member 22. In this way, the front bushing 260 is secured in place relative to the slidable body member 22, and the inner body member 24 slides relative to the front bushing 260 during the extension and retraction of the extended level.

[0103] Reference Figure 23 and Figure 24 The diagram illustrates a front bushing 280 according to an exemplary embodiment. Aside from the differences discussed herein, the front bushing 280 is substantially identical to the front bushing 260. The front bushing 280 includes flexible, outwardly biased arms 282 formed in each sidewall 284 of the front bushing 280. Hexagonal pins 270 are located on the arms 282, and the outward bias of the arms 282 facilitates snap-fitting and holding the front bushing 280 within the outer body member 22. Additionally, this outward bias also serves to securely retain the hexagonal pins 270 engaged within the opening 272.

[0104] Reference Figures 25 to 27 In various embodiments, the level 10 may include a pair of supports 300 that can be removably attached to opposite ends of the level body 12. Typically, the supports 300 define a pair of aligned and highly extended level surfaces 302. In use, the supports 300 can be mounted to the level body 12 so that the level 10 can be used to level two surfaces having an obstacle located therebetween.

[0105] To mount the support 300 to the level body 12, fasteners 304 are installed and held within the support 300. Figure 25 In the embodiment shown, fastener 304 is a threaded fastener that is screwed into an opposing threaded opening located in the level body 12. Figure 25As shown, the fastener 304 is held within the support 300 (e.g., via a lip member that captures the fastener within the support 300) such that the fastener 304 does not separate from the support 300 when the support 300 is disconnected from the level 10. In some embodiments, the level body 12 may include one or more alignment pins 306 that facilitate alignment of the fastener 304 with receiving holes within the level body. Figure 27 As best observed, the level 10 does not include an additional, protruding support mounting structure along the upper surface 40, so that the surface 40 remains level after the support 300 is removed.

[0106] Additionally, the support 300 includes a protrusion or hook 310. Typically, the hook 310 provides a structure that grips the edge or corner of the workpiece, allowing the user to pull and extend the level 10, while the end of the support is held in place via engagement with the workpiece through the hook 310. Figure 26 and Figure 27 As best shown, hook 310 is a protrusion that extends outward from surface 302 and in a direction toward the slidable body member 22. In this way, the upper half of support 300 is asymmetrical about the vertical axis, as... Figure 26 and Figure 27 As shown in the figure. In addition, the hook 310 is defined as having a width dimension that is larger than the width dimension of the surface 302 but smaller than the width dimension at the lower end of the support 300.

[0107] Reference Figure 28 This illustration shows a bottle assembly 320 for holding / positioning a level bottle 34 within a wall 72, according to an exemplary embodiment. Typically, the bottle assembly 320 includes a rear frame 322, a front frame 324, a front panel 326, and a plurality of fasteners shown as screws 328. Typically, the bottle opening 32 is located within the wall 72, and the level bottle 34 is located within the bottle opening 32. The rear frame 322 is positioned to surround both the bottle opening 32 and the level bottle 34 along the rear face of the wall 72, and the front frame 324 is positioned to surround both the bottle opening 32 and the level bottle 34 along the front face of the wall 72. In this arrangement, the inward-facing surfaces of the rear frame 322 and the front frame 324 engage with the level bottle 34, thereby confining the level bottle 34 within the bottle opening 32.

[0108] Bottle assembly 320 includes screws 328. Screws 328 pass through screw holes 330 in the front frame 324 and are received within threaded screw channels 332 in the rear frame 322. When screws 328 are tightened, the level bottle 34 is clamped between the rear frame 322 and the front frame 324, which secures the level bottle 34 relative to wall 72. In conventional assemblies where the level bottle is mounted within the vertical wall or web of a typical I-beam level frame, glue or adhesive is typically used to secure the level bottle and associated frame components. However, the applicant has found that, due to the relatively weak nature of such adhesives, this bottle assembly is prone to being pushed out of the bottle opening. Conversely, the mechanical, clamping force type of installation provided by screws 328 and frames 322 and 324 eliminates / reduces the risk of the bottle 34 being pushed out of the bottle opening 32.

[0109] Bottle assembly 320 includes a front panel 326 mounted on a front frame 324 and screws 328. The front panel 326 provides a surface unobstructed by screw heads, screw holes, or other fasteners. In a particular embodiment, the front panel 326 is glued into place on the front frame 324.

[0110] Reference Figure 29 In some embodiments, the level 10 may include a double-bottle assembly 340 located near one end of the level body 12. For example... Figure 29 As shown, the dual-bottle assembly is positioned adjacent to end 23, at the end of the level 10 opposite to the fixed body portion 20. Typically, the dual-bottle assembly 340 includes a pair of level bottles 34, one oriented horizontally and the other vertically, which are received within a pair of adjacent bottle openings 32. Positioning this pair of level bottles 34 adjacent to end 23 allows the user to easily observe the level bottles oriented vertically and horizontally, especially when the level 10 is in the extended position.

[0111] Similar to bottle assembly 320, dual-bottle assembly 340 includes a rear frame 342, a front frame 344, and a front panel 346. Dual-bottle assembly 340 is assembled like assembly 320, except that dual-bottle assembly 340 supports two leveling bottles 34 instead of one.

[0112] It should be understood that the accompanying drawings illustrate exemplary embodiments in detail, and it should be understood that this application is not limited to the details or methods set forth in the description or illustrated in the drawings. It should also be understood that the terminology is used for descriptive purposes only and should not be considered limiting.

[0113] Based on this description, other modifications and alternative embodiments of various aspects of the invention will be apparent to those skilled in the art. Therefore, this description should be interpreted as illustrative only. The constructions and arrangements shown in the various exemplary embodiments are merely illustrative. While several embodiments have been described in detail in this disclosure, many modifications (e.g., variations in the size, dimensions, structure, shape, and proportions of various elements, parameter values, installation arrangements, use of materials, color, orientation, etc.) can be made without substantially departing from the novel teachings and advantages of the subject matter described herein. Some elements shown as integrally formed may be composed of multiple parts or elements, the positions of elements may be reversed or otherwise changed, and the nature, number, or position of discrete elements may be varied or altered. According to alternative embodiments, the order or sequence of any process, logical algorithm, or method steps may be changed or reordered. Other substitutions, modifications, alterations, and omissions may also be made to the design, operating conditions, and arrangements of the various exemplary embodiments without departing from the scope of the invention.

[0114] Unless otherwise expressly stated, no method described herein shall be construed as requiring its steps to be performed in a particular order. Therefore, where a method claim does not actually describe the order in which its steps are followed, or where the claims or description do not otherwise specifically specify that the steps are limited to a particular order, no particular order can be inferred. Furthermore, the article “a” as used herein is intended to include one or more parts or elements, and is not intended to be construed as meaning only one.

[0115] Various embodiments of the present invention relate to any combination of any features, and any such combination of features may be claimed in this application or a future application. Any feature, element, or component of any of the exemplary embodiments described above may be used alone or in combination with any feature, element, or component of any other embodiment described above.

[0116] In various exemplary embodiments, the relative dimensions, including angles, lengths, and radii, shown in the figures are drawn to scale. Actual measurements of the figures will disclose the relative dimensions, angles, and scales of the various exemplary embodiments. The various exemplary embodiments extend to include a wide range of absolute and relative dimensions, angles, and scales that can be determined from the figures. The various exemplary embodiments include any combination of one or more relative dimensions or angles that can be determined from the figures. Furthermore, actual dimensions not explicitly listed in this description can be determined by combining the dimensions measured in the figures with the explicitly listed dimensions in the description. Additionally, in various embodiments, this disclosure extends to include a wide range of any absolute or relative dimensions disclosed herein or that can be determined from the figures (e.g., plus or minus 30%, 20%, or 10%).

Claims

1. A level, comprising: A body component that extends along a longitudinal axis; A first body portion, connected to the body component, the first body portion comprising: A flat first base surface; and A first top surface, which is opposite to the base surface; The second body portion is slidably connected to the body component, and the second body portion includes: A flat second base surface, said flat second base surface being coplanar with said flat first base surface, the first base surface and the second base surface jointly defining a working base surface; and A second top surface, which is coplanar with the first top surface; Horizontal sensing device; and a brake structure comprising an engagement surface that engages a surface of the body member, wherein an interface between the engagement surface and the body member biases the second body portion to remain stationary relative to the first body portion, wherein the engagement surface of the brake structure defines an area of at least 500 mm 2 ​ The relative positions of the first body portion and the second body portion define a fully retracted position and a fully extended position. The fully retracted position defines the shortest working length of the level along the longitudinal axis, and the fully extended position defines the longest working length of the level along the longitudinal axis.

2. The level of claim 1, comprising a locking mechanism coupled to the second body portion, the locking mechanism comprising a user-actuated control, wherein, The user-actuated control is configured such that movement of the user-actuated control causes the locking mechanism to move between a locked position and an unlocked position.

3. The level of claim 2, wherein, The user-actuated control element is a slider that translates along the longitudinal axis. The locking mechanism includes a brake structure that engages with the slider, such that movement of the slider causes the brake structure to move toward the body member. The brake structure includes an engagement surface that engages with the surface of the body member.

4. The level of claim 2, wherein, The user-actuated control is a slider that can be accessed from either side of the level.

5. The level of claim 1, the engagement surface of the brake structure defining an area of at least 1000 mm 2 .

6. The level according to claim 1, wherein the mating surface defines a length of at least 30 mm parallel to the longitudinal axis.

7. The level according to claim 1, wherein the ratio of the length of the engagement surface of the brake structure along the longitudinal axis to the shortest working length of the level is between 1:15 and 1:

50.

8. The level according to claim 1, wherein the first top surface and the second top surface together define a working top surface.

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