Laser level

Abstract

Provided in the present application is a laser level, comprising an outer cover assembly and an inner housing assembly supported inside the outer cover assembly by means of a spacer made of an elastically deformable material, wherein the spacer comprises a first spacer which is compressed when the outer cover assembly is displaced upwards relative to the inner housing assembly, and a second spacer which is compressed when the outer cover assembly is displaced downwards relative to the inner housing assembly; in a z direction, the first spacer and the second spacer are arranged along an outer periphery of the inner housing assembly and are offset outwardly from a damping device of a pendulum assembly; each spacer comprises a z-direction inner surface and a z-direction outer surface which are opposite to each other in the z direction, and the inner housing assembly and the outer cover assembly respectively comprise a z-direction outward surface and a z-direction inward surface which are configured to come into contact with the z-direction inner surface and the z-direction outward surface, and the outer cover assembly and the inner housing assembly comprise matching upward stop features, such that a displacement distance is prevented from being further increased when an upward displacement distance of the outer cover assembly relative to the inner housing assembly in the z direction reaches a preset value.

Description

laser level Technical Field

[0001] The present application relates to a laser level. Background Art

[0002] A laser level generally consists of an outer housing assembly, an inner housing assembly supported within the outer housing assembly, and a pendulum assembly supported within the inner housing assembly. The pendulum assembly primarily comprises a bracket, a pendulum supported by the bracket and capable of swinging or pivoting, a laser source mounted on the pendulum for emitting laser light, and a damping device capable of placing and maintaining the pendulum in a suspended position. The pendulum assembly is also equipped with a variety of high-precision sensors and other precision components.

[0003] In the prior art, numerous studies have been conducted to mitigate or reduce the vibration, shock, stress, and even extrusion damage that can occur to a laser level, particularly its pendulum assembly, and more particularly its high-precision or precision components, when dropped. A series of structures designed to absorb shock or vibration or increase the rigidity of the inner housing assembly have been developed. For example, elastic spacers are added between the outer housing assembly and the inner housing assembly of the laser level. These spacers are positioned between the top and bottom surfaces of the inner housing assembly and the corresponding surfaces of the outer housing assembly, separating the two and absorbing impact energy.

[0004] However, the spacer disposed below the (bottom wall of) the inner shell assembly covers or contacts most or substantially the entire bottom surface of the bottom wall of the inner shell assembly, and thus when the spacer is subjected to an impact pulse or energy from the outer cover assembly (for example, caused by the falling of the laser level), it will transfer it to the contact area of ​​the bottom wall of the inner shell assembly in contact with the spacer, specifically the area below the damping device of the pendulum assembly, causing these areas to deform.

[0005] When these areas deform inward (or upward) toward the pendulum assembly too much, the relevant components of the damping device of the pendulum assembly may be impacted, causing vibration, or even being squeezed and damaged in severe cases, and correspondingly generating stress inside the relevant components. The shock pulse may also affect the accuracy of the sensor or related components, and thus affect the accuracy of the laser level. In addition, the shock pulse is transmitted to the pendulum assembly, accompanied by vibration and noise, which can be known by measuring the G-force value on the pendulum system. It is known from the test that when falling from a height, for example, when the falling distance is greater than 2 meters, the measured G-force value on the pendulum system will be very high, and squeezing and collision have occurred between the components of the damping device.

[0006] Summary of the Invention

[0007] The purpose of this application is to improve the structure of a laser level so that it has better cushioning performance when it falls from a height.

[0008] In a first aspect of the present application, a laser level is provided, comprising: an outer cover assembly; an inner housing assembly located inside the outer cover assembly; a pendulum assembly supported within the inner housing assembly, the pendulum assembly comprising a damping device disposed near a bottom wall of the inner housing assembly; and a spacer supporting the inner housing assembly within the outer cover assembly and made of an elastically deformable material.

[0009] wherein the spacer comprises a first spacer that is compressed when the outer cover assembly is displaced upward relative to the inner shell assembly and a second spacer that is compressed when the outer cover assembly is displaced downward relative to the inner shell assembly;

[0010] wherein, when viewed along the z-direction, the first spacer and the second spacer are arranged along the outer periphery of the inner housing assembly and are offset outwardly from the damping device of the pendulum assembly,

[0011] wherein the spacer comprises a z-direction inner side surface and a z-direction outer side surface respectively facing toward and away from the pendulum assembly in the z-direction, and the inner shell assembly and the outer cover assembly respectively comprise a z-direction outer side surface and a z-direction inner side surface for contacting the z-direction inner side surface and the z-direction outer side surface, so as to compress the first spacer and the second spacer respectively when the outer cover assembly is displaced upward and downward in the z-direction relative to the inner shell assembly.

[0012] The outer cover assembly and the inner shell assembly include matched upward stop features, so that when the upward displacement distance of the outer cover assembly relative to the inner shell assembly along the z-direction reaches a preset value, the displacement distance is prevented from further increasing.

[0013] In a second aspect of the present application, a laser level is provided, comprising: an outer cover assembly; an inner shell assembly located inside the outer cover assembly; and a pendulum assembly within the inner shell assembly, wherein the inner shell assembly is supported within the outer cover assembly by means of eight spacers, the eight spacers comprising four lower spacers arranged near the bottom at four corners of the outer periphery and four upper spacers arranged near the top at four corners of the outer periphery, the eight spacers being all made of an elastically deformable material.

[0014] wherein the inner housing assembly defines an outer receiving space for each spacer, which defines a z-direction outer surface for contacting the z-direction inner surface of the corresponding spacer; and the outer cover assembly defines an inner receiving space for receiving each of the upper and lower spacers, which includes a z-direction inner surface for contacting the z-direction outer surface of the corresponding spacer.

[0015] wherein the inner housing space of the outer cover assembly and the outer housing space of the inner housing assembly are configured to allow the outer cover assembly to be displaced relative to the inner housing assembly in any of two opposite orientations in any of the x-, y-, and z-directions,

[0016] The outer cover assembly and the inner shell assembly include cooperating upward stop features, so that when the outer cover assembly resists the elastic deformation force of the lower spacer and the upward displacement distance relative to the inner shell assembly in the z direction reaches a preset value, the displacement distance is prevented from further increasing.

[0017] In a third aspect of the present application, a laser level is provided, comprising: an outer cover assembly; an inner housing assembly located inside the outer cover assembly; and a pendulum assembly supported within the inner housing assembly, wherein the inner housing assembly is supported within the outer cover assembly via eight spacers made of elastically deformable material and arranged at eight corners of the inner housing assembly.

[0018] Each spacer is sandwiched between the z-direction outward surface of the inner shell assembly and the z-direction inward surface of the outer cover assembly in the vertical z-direction, and is opposite to or in contact with corresponding surfaces of the inner shell assembly and the outer cover assembly in any direction perpendicular to the z-direction, so as to allow the outer cover assembly to be displaced toward the inner shell assembly in any direction.

[0019] The outer cover assembly and the inner shell assembly further include a stop feature that interferes with each other when the distance the outer cover assembly is displaced toward the inner shell assembly reaches a preset threshold to prevent the outer cover assembly from further displacing toward the inner shell assembly.

[0020] According to the laser level of the present application, the inner housing assembly is supported within the outer housing assembly by spacers made of elastic material. Specifically, the spacers include a first spacer that allows the outer housing assembly to shift upward relative to the inner housing assembly when the laser level is dropped and impacted, and a second spacer that allows the outer housing assembly to shift downward relative to the inner housing assembly. The first spacer of the present application is arranged at the outer periphery of the inner housing assembly. When the upward displacement of the outer housing assembly relative to the inner housing assembly exceeds a preset value (i.e., the upward compression of the first spacer exceeds the preset value), causing the contact (surface) area of ​​the inner housing assembly and the spacer to be subjected to impact energy (or pulse), the deformation of the contact area does not affect the damping device located above the substantially central region of the bottom wall of the inner housing assembly. In other words, the impact energy transmitted to the inner housing assembly is transferred as far away from the central region as possible in a horizontal plane perpendicular to the vertical direction. This effectively avoids affecting the relevant components of the damping device or the high-precision sensor located directly above the bottom wall of the inner housing assembly, and in particular, avoids excessive deformation of the bottom wall of the inner housing assembly that could squeeze the relevant components of the damping device. In addition, the contact surfaces between the spacers of the present application and the inner shell assembly and the outer cover assembly extend horizontally, maximizing the efficiency of the spacers in withstanding impacts. Experiments have shown that when the laser level falls, the spacer arrangement of the present application not only greatly reduces the G-force value on the pendulum assembly, greatly reduces the stress value and damage risk inside the relevant components, but also plays a role in reducing impact noise. In addition, more advantageously, the spacers can be set at the corners of the outer periphery, sandwiched between the inner shell assembly and the outer cover assembly in all directions, and the contact surfaces with the inner shell assembly and the outer cover assembly can be parallel to the coordinate plane, which enables these spacers to also provide absorption and buffering effects for impacts in other directions, providing all-round impact protection for the laser level. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other aspects and features of the present application are more easily understood in the detailed description given below with reference to the accompanying drawings. The illustrated examples are only used to explain and illustrate the principles of the present application and are not intended to limit the scope of protection of the present application.

[0022] FIG1 is a partially exploded view of a laser level according to a first embodiment of the present application.

[0023] FIG. 2 is a view similar to FIG. 1 .

[0024] 3 is a cross-sectional view of the laser level of FIG. 1 in an assembled state, taken along a cross section defined by an up-down direction (z direction) and a front-rear direction (y direction) when viewed from right to left.

[0025] FIG4 is a partially enlarged view of FIG3 .

[0026] FIG5 is a partial exploded view of a laser level according to a second embodiment of the present application.

[0027] 6 is a cross-sectional view of the laser level of FIG. 5 in an assembled state, taken along a cross section defined by an up-down direction (z direction) and a left-right direction (x direction) when viewed from the front left to the rear.

[0028] FIG7 is a partial enlarged view of FIG6 .

[0029] FIG. 8 is an oblique cross-sectional view of a related structure of one of the middle pieces in FIG. 5 .

[0030] FIG9 is a partially enlarged view of FIG8 . DETAILED DESCRIPTION

[0031] The following describes a laser level constructed according to the principle of the present application with reference to the accompanying drawings: Figures 1-4 show a first embodiment of the laser level, and Figures 5-10 show a second embodiment of the laser level.

[0032] First, refer to Figures 1-4. In general, the laser level of the present application includes an outermost outer cover assembly 100, an inner housing assembly 200 located within the outer cover assembly 100, and a pendulum assembly 300 located within the inner housing assembly 200. The outer cover assembly 100 and the inner housing assembly 200 are generally box-shaped structures that are substantially hexahedral. Each of them can be made of a non-metallic material such as thermoplastic and can be composed of two halves that are opposite in the left-right direction or the front-back direction. For example, in the illustrated embodiment, the outer cover assembly 100 and the inner housing assembly 200 can each be composed of two halves that are opposite in the left-right direction (the left and right covers 100a and 100b of the outer cover assembly 100 have been separated in Figures 1, 2, and 5). The pendulum assembly 300 mainly includes a bracket supported by the inner shell assembly 200, a pendulum pivotally supported by the bracket, a damping device 36 (Figure 3) that can place and maintain the pendulum in a suspended state and is arranged closest to the bottom wall of the inner shell assembly 200, and one or more laser sources 38 arranged on the pendulum for emitting lasers. For example, in this embodiment, there are three laser sources 38 as shown in Figure 2.

[0033] This article describes laser levels with reference to the three perpendicular directions x, y, and z. The orientation of a laser level during use is shown in Figures 1 and 2. The z-direction is the direction along which the pendulum moves when in a suspended state, i.e., the vertical direction. For ease of description, this direction is sometimes referred to as the up-down direction. The z-direction defines two opposite "directions," "up" and "down." The x- and y-directions are perpendicular to each other and to the z-direction, defining a horizontal plane. The x-direction is also called the left-right direction. The x-direction indicates the right direction, while the opposite direction is the left. The x-direction, or left-right direction, defines two opposite "directions," "left" and "right." The y-direction is also called the fore-aft direction. The y-direction indicates the front direction, while the opposite direction is the back. Therefore, the y-direction, or fore-aft direction, defines two opposite "directions," "fore" and "back." The x-, y-, and z-directions can be the three orthogonal axis directions of the laser level coordinate system with its origin at the approximate center position (e.g., the geometric center or center of mass) of the pendulum assembly 300. Thus, the three coordinate planes of the coordinate system are the xy coordinate plane defined by the x- and y-directions, the yz coordinate plane defined by the y- and z-directions, and the zx coordinate plane defined by the z- and x-directions. The directional terms "front," "rear," "left," "right," "up," and "down" used in this application are to be understood with reference to the orientations described above and in the figures. It should also be noted that the directional terms "inward" and "outward" are used multiple times in this application to refer to any direction (x or left-right, y or front-to-back, or z or up-down) at the components currently described, from the outside of the laser level toward the inside of the laser level (e.g., from the outer housing assembly toward the pendulum assembly) and from the inside of the laser level toward the outside of the laser level (e.g., from the pendulum assembly toward the outer housing assembly), respectively. For example, the "x-direction inner (or outer) surface" of the outer cover assembly 100 or the inner housing assembly 200 refers to a surface that extends generally perpendicular to the x-direction (or generally parallel to the yz coordinate plane) and faces (or faces away) from the interior of the laser level; the "y-direction outer (or inner) surface" of the spacer refers to a surface that extends generally perpendicular to the y-direction (or generally parallel to the xz coordinate plane) and faces (or faces) from the interior of the laser level. However, it should be understood that the above definitions of directional terms are provided for convenience of description only and are not intended to be limiting. Furthermore, the understanding of these directional terms should also change accordingly if the placement orientation of the laser level changes.

[0034] In the illustrated embodiment, the inner housing assembly 200 is supported within the outer cover assembly 100 solely by means of eight elastically deformable spacers. In other words, the inner housing assembly 200 and the outer cover assembly 100 are separated only by eight spacers 50 (50a-50h). These eight elastic spacers are generally distributed at eight corners between the inner housing assembly 200 and the outer cover assembly 100 (outside the inner housing assembly 200 and inside the outer cover assembly 100). Four lower spacers 50a-50d are disposed between the inner housing assembly 200 and the outer cover assembly 100 in the lower region of the inner housing assembly 200, and four upper spacers 50e-50h are disposed between the inner housing assembly 200 and the outer cover assembly 100 in the upper region of the inner housing assembly 200. Each spacer 50 is generally hexahedral in shape and, in the illustrated assembled state and orientation, has a pair of opposing surfaces in each of the z-, x-, and y-directions: an upper surface 12 and a lower surface 14; a left surface 16 and a right surface 18; and a front surface 13 and a rear surface 17. These surfaces are exemplarily labeled in FIG2 for spacers 50d and 50f. Each surface of each spacer extends parallel to a corresponding coordinate plane.

[0035] With reference to the above description of the directions "inside" and "outside," each spacer has an inner surface facing the inside of the laser level (toward the pendulum assembly) and an outer surface facing the outside of the laser level (away from the pendulum assembly) in each of the x-, y-, and z-directions. The inner surface in each direction faces or contacts the corresponding outward-facing surface of the inner housing assembly (the "outward-facing surface" being the surface facing the outside of the laser level), and the outer surface in each direction faces or contacts the corresponding inward-facing surface of the outer housing assembly (the "inward-facing surface" being the surface facing the inside of the laser level). Taking the lower left rear spacer 50d as an example, its inner surfaces in the x-, y-, and z-directions are the right surface 18, the front surface 13, and the upper surface 12, respectively, and its outer surfaces in these three directions are the left surface 16, the rear surface 17, and the lower surface 14, respectively. For another example, the inner surfaces of the upper right rear spacer 50f in the x-, y- and z-directions are the left surface 16, the front surface 13 and the lower surface 14, respectively, and the outer surfaces in these three directions are the right surface 18, the rear surface 17 and the upper surface 12, respectively.

[0036] For each spacer 50, the inner shell assembly 200 is provided with three corresponding outward surfaces in contact with the three inner side surfaces in three directions of the spacer. These three outward surfaces extend roughly parallel to the corresponding coordinate planes and intersect at one point to form an external accommodation space for receiving the corresponding spacer. Thus, each external accommodation space for receiving (a part of) each spacer is open outward in the three directions of x, y and z. Taking the upper right front spacer 50e that can be clearly seen in Figure 2 as an example, the inner shell assembly 20 defines an external accommodating space 21e for the spacer 50e, which is defined by a z-direction outward surface 214 (i.e., an upward-facing surface, which contacts the z-direction inner surface-lower surface 14 of the spacer 50e), a y-direction outward surface 217 (i.e., a forward-facing surface, which contacts the y-direction inner surface-rear surface 17 of the spacer 50e) and an x-direction outward surface 216 (i.e., a rightward-facing surface, which contacts the x-direction inner surface-left surface 16 of the spacer 50e) intersecting at a vertex 215.

[0037] For each spacer 50, the outer cover assembly 10 is provided with three corresponding inwardly facing surfaces that contact the three outer surfaces of the spacer in three directions. These three inwardly facing surfaces extend parallel to corresponding coordinate planes and intersect at a point, forming a content space for receiving the corresponding spacer. Thus, each content space for receiving (a portion of) each spacer is open inwardly in the x-, y-, and z-directions. Taking the lower left rear spacer 50d clearly visible in FIG2 as an example, the outer cover assembly 10 defines a content space 11d for this spacer 50d, which is defined by a z-direction inwardly facing surface 114 (i.e., an upwardly facing surface that contacts the z-direction outer surface (lower surface 14) of the spacer 50d), a y-direction inwardly facing surface 117 (i.e., a forwardly facing surface that contacts the y-direction outer surface (rear surface 17) of the spacer 50e), and an x-direction inwardly facing surface 116 (i.e., a rightwardly facing surface that contacts the x-direction outer surface (left surface 16) of the spacer 50e), which intersect at an apex 115.

[0038] In the illustrated embodiment, for each spacer 50, each of the three outward-facing surfaces (e.g., surfaces 214, 217, and 216) defining the outer housing space (e.g., 21e) of the inner housing assembly 20 contacts (or abuts) a corresponding one of the three inner side surfaces (e.g., surfaces 14, 17, and 16 of the spacer 50f), and each of the three inward-facing surfaces (e.g., surfaces 114, 117, and 116) defining the inner housing space (e.g., 11d) of the outer cover assembly 10 contacts (or abuts) only a portion of a corresponding one of the three outer side surfaces (e.g., surfaces 14, 17, and 16 of the spacer 50d). In other words, the three inward-facing surfaces of the outer cover assembly 10 only cover a portion of the corresponding outer side surfaces of the spacer. A portion of each of the three outer side surfaces of each spacer is not covered by the outer cover assembly 100 and is exposed to the gap between the inner housing assembly 20 and the outer cover assembly 10. The spacer has exposed areas in three directions to allow the spacer to elastically deform when subjected to pressure from the deformed outer cover assembly 10 (inward squeezing force in any direction, such as upward impact or squeezing force in the case of a drop impact), or to have a buffering or impact energy absorption function in three directions.

[0039] The following description uses lower right rear spacer 50c as an example. Referring to Figures 3 and 4 , the cross-sectional view in Figure 3 passes through the four right spacers—the lower two spacers 50b and 50c and the upper two spacers 50e and 50f. Figure 4 is an enlarged view of the lower right rear spacer 50c region in Figure 3 .

[0040] 3 and 4 illustrate the spacer 50 c as follows: the front surface 13 serving as the y-inside surface and the rear surface 17 serving as the y-outside surface; the upper surface 12 serving as the z-inside surface and the lower surface 14 serving as the z-outside surface; the y-outside surface (rearward-facing surface) 223 of the inner housing assembly 20 in contact with its y-inside surface 13; the z-outside surface (downward-facing surface) 222 of the inner housing assembly 20 in contact with its z-inside surface 12; the y-inside surface (forward-facing surface) 127 of the outer cover assembly 10 in contact with its y-outside surface 17; and the z-inside surface (upward-facing surface) 124 of the outer cover assembly 10 in contact with its z-outside surface 14. The y-outer surface 223 and the z-outer surface 222 of the inner housing assembly 20 cover or contact the entire respective surfaces 13 and 12 of the spacer 50c, and the y-inner surface 127 and the z-inner surface 124 of the outer cover assembly 10 each contact only a portion of the respective surfaces 17 and 14 of the spacer 50c. Although not shown in FIG3 , in this embodiment, the x-outer surface (the rightward-facing surface) of the inner housing assembly 20 also contacts the entire respective (leftward) surface of the spacer 50c, and the x-inner surface (the leftward-facing surface) of the outer cover assembly 10 also contacts only a portion of the respective (rightward) surface of the spacer 50c.

[0041] In this manner, the y-inner surface 13, the z-inner surface 12, and the x-inner surface (not shown) of the spacer 50c are all completely contacted and covered by the inner housing assembly 20, and each of the y-outer surface 17, the z-outer surface 14, and the x-outer surface (not shown) of the spacer 50c is partially, but not completely, covered by the outer cover assembly 10. Specifically, the y-inner surface 127 (and the x-inner surface (not shown)) of the outer cover assembly 10 extends inward (or upward) along the z-direction to a distance G1 from the z-inner surface (upper surface 12) of the spacer 50c, that is, to a distance G1 below the surface. The z-inner surface 124 of the outer cover assembly 10 (and the x-inner surface not shown in the figures) extends inwardly (or forwardly) in the y-direction to a distance G2 from the y-inner side surface (front surface 13) of the spacer 50c, that is, to the right of the surface by a distance G2; and the y-inner surface 127 and the z-inner surface 124 of the outer cover assembly 10 extend inwardly (or leftwardly) in the x-direction to a distance G3 from the x-inner side surface (left surface not shown in the figures) of the spacer 50c (not shown in Figures 3 and 4, but Figure 6 illustrates the distance G3 for the spacer 50b).

[0042] In addition, as shown in the figure, the z-direction outer surface 222 of the inner shell assembly 10 extends outward (rearward) along the y-direction beyond the y-direction inner surface 127 of the outer shell assembly 10, forming an extension 221. In this way, when the outer shell assembly 10 is subjected to an upward impact pulse or energy in the z-direction, its z-direction inner surface 124 presses the spacer 50c upward, and at the same time, the outer shell assembly 100 shifts upward relative to the inner shell assembly 200, and the spacer 50c is deformed to the gap between the distances G2 and G3. When the outer cover assembly 100 is displaced upward by a distance G1, the y-direction inner surface 127 of the outer cover assembly 100 has interfered with the extension 221 of the z-direction outer surface 222 of the inner housing assembly 10, which prevents the outer cover assembly 10 from further displacing upward (thereby limiting the maximum displacement of the outer cover assembly 100 relative to the inner housing assembly 200) and prevents the spacer 50c from being further compressed along the z-direction (thereby limiting the maximum deformation of the spacer).

[0043] It is contemplated that, similar to spacer 50c, the other three lower spacers 50a, 50b, and 50d also have the aforementioned three corresponding distances (intervals) G1, G2, and G3. Since the four lower spacers 50a-50d all have distances corresponding to and equal to or greater than distance G1 (e.g., distance G1 for spacer 50b in FIG3 ), the maximum upward displacement distance permitted for the outer cover assembly 100 relative to the inner housing assembly 200 is G1. This upward relative displacement stops when the y-direction inner surface 127 of the outer cover assembly 10 for spacer 50c interferes with (the interference portion 221 of) the z-direction outer surface 222 of the inner housing assembly 10. Thus, the y-direction inner surface 127 of the outer cover assembly 10 for spacer 50c and the z-direction outer surface 222 of the inner housing assembly 10 (due to the aforementioned interference) form an upward stop structure. Although the spacer 50b shown in Figure 3 does not provide the interference structure (or stop structure) described above for the spacer 50c, those skilled in the art will understand that one or more, or even all, of the lower spacers 50a, 50b and 50d may be provided with the above-mentioned stop structure.

[0044] After the outer cover assembly 10 and the inner housing assembly 20 interfere with each other, the pulse or energy that causes the outer cover assembly 100 to further shift upward relative to the inner housing assembly 200 is transmitted to the inner housing assembly 20 via the (four) spacers, specifically to the areas of the inner housing assembly 20 that contact the spacers, i.e., the z-direction outer surfaces, causing deformation in these contact areas. Because the four lower spacers of the present application are arranged at the four corners of the outer periphery of the inner housing assembly 20 as viewed in the z-direction, deformation of these contact areas does not, or substantially does not, cause deformation in the central area of ​​the bottom wall 27 of the outer cover assembly 100 located directly below the pendulum assembly 30 (or closest to the damping device 36 of the pendulum assembly 30). This prevents the upward deformation of this area from substantially affecting or even squeezing the relevant components of the pendulum assembly, thereby preventing stress or damage to these components due to squeezing.

[0045] Although not shown in the cross-sectional views of Figures 3 and 4 , the z-direction outward surface 222 of the inner housing assembly 200 for the spacer 50c can also extend outward (rightward) in the x-direction beyond the x-direction inward surface of the outer housing assembly 10, forming an extension. When the outer housing assembly 100 reaches the upward displacement distance G1 relative to the inner housing assembly 200, the two interfere with each other, acting as an upward stop, and thus can also serve as an upward stop structure. However, this is not required. Those skilled in the art will understand that as long as at least a portion of either the x-direction inward surface or the y-direction inward surface of the outer housing assembly 10 interferes with the extension of the z-direction outward surface 222 of the inner housing assembly 200, the stop function described herein can be achieved.

[0046] Those skilled in the art may also envision that, as an alternative or additional solution to the upward stop structure formed by the extension of either the x-direction inner surface or the y-direction inner surface of the outer cover assembly 10 and the z-direction outer surface 222 of the inner shell assembly 200, the z-direction inner surface 124 of the outer cover assembly 10 may be extended inwardly beyond the corresponding surface of the y-direction outer surface 223 and the x-direction outer surface of the inner shell assembly 200 in either the y-direction or the x-direction, and at least the corresponding surface (or both) of the y-direction outer surface 223 and the x-direction outer surface of the inner shell assembly 200 may not extend downwardly to the z-direction inner surface 124 of the outer cover assembly 10, but may extend above the z-direction inner surface 124 of the outer cover assembly 10 by a distance greater than or equal to G1. This may also provide a similar stopping function when the outer cover assembly 100 reaches the upward displacement distance G1 relative to the inner shell assembly 200.

[0047] The above description details the most common application (where the outer cover assembly 100 is subjected to an upward impact pulse during a drop impact). The four spacers 50a-50d disposed at the four outer corners of the bottom of the inner housing assembly 200 provide the advantage of effectively protecting the relevant components of the laser level (parts of the pendulum assembly 30 adjacent to the bottom wall 21 of the inner housing assembly 200) from excessive impact, vibration, or crush damage in this application. Similarly, those skilled in the art will appreciate that the four spacers 50e-50h disposed at the four outer corners of the top of the inner housing assembly 200 can effectively provide cushioning and shock absorption when the outer cover assembly 100 is subjected to a downward impact. This description will not be repeated in detail here. However, it should be noted that while the two upper spacers 50e and 50f illustrated in the cross-sectional view of FIG3 do not include downward stop structures similar to the upward stop structures described above, those skilled in the art will appreciate that one or more or all of the four upper spacers 50e-50f may include similar stop structures. For example, the z-direction outward surface 234 of the spacer 50f of the inner housing assembly 200 in FIG3 can continue to extend outward (rearward) in the y-direction to form an extension corresponding to the extension 221, so as to interfere with the surface 137 of the outer cover assembly 100 when the outer cover assembly 100 is displaced downward relative to the inner housing assembly 200 by a distance G5. This downward predetermined value (distance) G5 can be equal to, less than, or greater than the upward predetermined value (distance) G1.

[0048] In this way, the four lower spacers 50a-50d and the four upper spacers 50e-50h are arranged at the four corners of the outermost periphery, which can not only absorb or buffer the impact in the two directions of the above-mentioned z direction, but also absorb or buffer the impact in any direction in other directions.

[0049] For example, as shown in FIG3 , with respect to two right-side spacers 50b and 50c of the four lower spacers 50a-50d and two right-side spacers 50e and 50f of the four upper spacers 50e-50h, since the spacers 50c and 50f are both designed with an x-direction gap G3 ( FIG6 ), these four right-side spacers can withstand an x-direction leftward impact from the right side of the outer cover assembly 100. When subjected to a leftward-directed impact, the x-direction inner surfaces of the outer cover assembly 100 for the spacers 50b, 50c, 50e, and 50f (the x-direction inner surfaces 133 and 153 of the spacers 50b and 50e are identified in FIG6 ) press the corresponding spacers leftward (inwardly in the x-direction), and the outer cover assembly 100 is displaced leftward relative to the inner housing assembly 200. Because the laser level (or outer cover assembly 100) is less likely to be impacted in the x-direction (one of the horizontal directions) and the energy involved is generally not significant, the elastic resistance of the spacers 50c and 50f is sufficient to resist the resulting displacement of the outer cover assembly 100. Alternatively, the leftward displacement of the outer cover assembly 100 relative to the inner housing assembly 200 is generally less than the preset gap G3, and in this case, the aforementioned leftward stop structure may not be provided. Optionally, as previously described, a leftward stop structure may also be provided to prevent the outer cover assembly 100 from further increasing in displacement when the leftward displacement relative to the inner housing assembly 200 reaches a preset value.

[0050] Similarly, the two left spacers 50a and 50d of the four lower spacers 50a-50d and the two left spacers 50g and 50h of the four upper spacers 50e-50h are designed to resist the impact in the right direction from the left; the front two spacers 50a and 50b of the four lower spacers 50a-50d and the front two spacers 50e and 50h of the four upper spacers 50e-50h (due to the setting of the y-direction distance, this y-direction distance is The spacers 50b and 50e shown in FIG3 (labeled G4, respectively) are designed to resist impacts directed rearward from the front; the rear two spacers 50c and 50d of the four lower spacers 50a-50d and the rear two spacers 50f and 50g of the four upper spacers 50e-50h (due to the setting of the y-direction distance, this y-direction distance is labeled G2 for the spacers 50c and 50f shown in FIG3) are designed to resist impacts directed forward from the rear. Similarly, corresponding stop structures may or may not be provided.

[0051] Therefore, the arrangement of the eight spacers of the present application provides all-around protection, capable of cushioning or absorbing impacts from any orientation in any of three directions. Furthermore, preferably, the outermost surfaces of the eight spacers do not extend beyond the outermost contours on either side of the substantially hexahedral inner housing assembly 200, resulting in a compact structural design. For example, the z-direction outer surfaces (lower surfaces) of the four lower spacers 50a-50d are all located at or near the bottommost surface 207 of the bottom wall 27 of the inner housing assembly 200, and the y-direction outer surfaces (front surfaces) of the four front spacers 50a, 50b, 50e, and 50h are all located at or near the outermost (front) surface 203 of the front side wall 23 of the inner housing assembly 200.

[0052] In the illustrated embodiment, the four lower spacers 50a-50d are arranged at the same height in the z-direction, but this is not required. For example, the four upper spacers 50e-50h (e.g., spacers 50f and 50e in FIG. 3 ) are arranged at different heights in the z-direction. The arrangement of the spacers can be flexibly configured based on the outer contour of the inner housing assembly 200, as long as they are all arranged at the outermost sides or ends of the inner housing assembly 200 in three directions.

[0053] In the illustrated embodiment, each spacer is in the shape of a regular hexahedron, and each outward-facing surface of the inner shell assembly 20 for contacting the spacer and each inward-facing surface of the outer cover assembly 10 for contacting the spacer are all in a square shape. This is particularly advantageous for the size design (or specification selection) of the spacer and the size design of the corresponding placement structure. The following is an example of the configuration in which the spacers shown in Figures 1-4 are all regular hexahedron structures and the contact surfaces of the inner shell assembly 200 and the outer cover assembly 100 with the spacers are all square. Assuming a drop height of 2 meters, a linear compression rate of 35% for the spacer made of an exemplary elastomer of a certain hardness, and assuming that the four lower spacers ideally and evenly absorb the impact load, a 248mm gap needs to be provided between the outer cover assembly 10 and the four spacers. 2 The contact area (ie, the sum of the areas of the four z-direction inward surfaces 124 for the four spacers 50a-50d), ie, the area of ​​each z-direction inward surface 124 of the square is approximately 62mm 2 For example, the side length of surface 124 is approximately 8 mm. Assuming that the allowable compression of each spacer (i.e., distance G1 in the figure, which is also the maximum amount of upward displacement allowed for the outer cover assembly 10) is 4 mm, the side length of the cube-shaped spacer is 12 mm or greater. In this way, the designer can select the closest standard spacer specification, such as a commercially available cube with a side length of 12.5 mm, as the spacer for this laser level. The designer can then design or determine the specific structure of the inner housing assembly 200 and the outer cover assembly 100 that can provide the above-mentioned contact surface.

[0054] Those skilled in the art will also understand that the spacer does not necessarily have to be in the shape of a regular hexahedron as shown in the figure. Depending on the actual structure of the inner housing assembly 200 and the outer cover assembly 100 and the predetermined deformation amount of the spacer in each direction (e.g., the values ​​of G1, G2, etc.), the spacer may be in the shape of a rectangular parallelepiped.

[0055] Those skilled in the art may also envision that the y-direction outward and y-direction inward surfaces of each spacer of the inner housing assembly 200 and the outer cover assembly 100, as well as the x-direction outward and x-direction inward surfaces of the inner housing assembly 200 and the outer cover assembly 100, do not necessarily contact the spacer. In other words, except for the contact members being pressed and sandwiched between the inner housing assembly 200 and the outer cover assembly 100 in the z-direction, gaps may exist between the spacers in any other direction perpendicular to the z-direction (e.g., the aforementioned y-direction and x-direction).

[0056] In the illustrated embodiment, the outer and inner storage spaces for each spacer of the inner housing assembly 200 and the outer cover assembly 100 each include three contact surfaces relative to a vertex, each of which is square in shape and all of which are planar. These details are exemplary. For example, each contact surface need not be square or continuous, and may even include non-planar features such as concave or convex portions at one or more locations. For example, the three contact surfaces 114, 116, and 117 defining the inner storage space 11d in FIG. 2 do not necessarily need to be relative to the vertex 115. The edges of each contact surface need not be regular, straight edges; for example, they may be curved or serrated, as long as they do not affect the aforementioned functionality.

[0057] In the illustrated embodiment, by way of example and not limitation, the inner housing space for each spacer of the outer cover assembly 10 is provided by a receptacle protruding inwardly at a corresponding position (or corner), such as the receptacles 40b, 40c, 40f, and 40e for spacers 50b, 50c, 50f, and 50e in FIG3 . Also by way of example and not limitation, each receptacle may be a cantilever structure, and the specific structure of each receptacle may be the same, or may be different as shown, as long as the functional contact surface described herein is provided. It is also contemplated by those skilled in the art that, similarly, the inner housing assembly 20 may include an outwardly protruding receptacle to provide an outer housing space for each spacer, while the outer cover assembly 100 does not include a receptacle structure. In some embodiments, based on the different structures of the corners of the inner housing assembly 200 and the outer cover assembly 100 and the gap therebetween, for one or more spacers, the inner housing assembly 200 and the outer cover assembly 100 may respectively include receptacles or support walls protruding toward each other to provide one or more contact surfaces for contacting the spacers.

[0058] As previously described with respect to Figures 1-4, the outer cover assembly 100 is composed of opposing left and right covers 100a, 100b, each of which includes four receptacles protruding inwardly from its four inner corners to provide internal spaces for receiving corresponding spacers. These receptacles can be formed separately and fastened to the corresponding cover in any feasible manner, or they can be formed integrally with the cover.

[0059] For example, the four receptacles for the four left-side spacers can be integrally formed with the left cover 100a of the outer cover assembly 100, and the four receptacles for the four right-side spacers can be integrally formed with the right cover 100b of the outer cover assembly 100. The left cover 100a and the right cover 100b of the outer cover assembly 100 are typically manufactured using a molding process. However, in actual manufacturing, due to limitations in the manufacturing process, some dimensions of the receptacles cannot be achieved as required.

[0060] For example, the perspective view of FIG5 illustrates that the four receptacles (to the extent that they protrude inward from the outer cover assembly 100) provided by the left cover 100a of the outer cover assembly 100 for the four left-side spacers (50a, 50d, 50g, and 50h) do not provide sufficient surface area in the x-direction to contact or abut the x-direction outer surfaces of the corresponding spacers. Therefore, these receptacles require intermediate members 90 to compensate for the dimensional differences in the x-direction. FIG5 illustrates that the four intermediate members 90 used for this compensation function have been moved away from their corresponding receptacles in the left cover 100a. FIG5 shows the receptacle 40d and the internal storage space 11d for the spacer 50d.

[0061] FIG6 is a cross-sectional view showing the left cover 100a and the receptacles 40a and 40h for the spacers 50a and 50h protruding inwardly therefrom, as viewed from front to rear through the four front spacers 50a, 50b, 50e, and 50h, and the right cover 100b and the receptacles 40b and 40e protruding inwardly therefrom for the spacers 50b and 50e. Each receptacle is provided with an intermediate member 90 to compensate for dimensional differences in the x-direction. FIG7 is an enlarged view of the area of ​​spacer 50h in FIG6.

[0062] 8 and 9 for details of the intermediate member 90. FIG. 8 schematically illustrates the left cover 100a of FIG. 5, showing that the receptacle 40d for the spacer 50d and the intermediate member 90 are beveled. FIG. 9 is a partial enlarged view of FIG. 8.

[0063] Since the function of the intermediate member 90 is to compensate for the dimensional difference of the receptacles in the x-direction and to provide an x-direction inner surface 143 ( FIG. 9 ) for contacting the corresponding spacer, the structural details and parameters of the intermediate member 90 are not limited as long as these two requirements are met. The intermediate member 90 can be fixed to the corresponding receptacle of the outer cover assembly 100 by any feasible means known in the art, such as, but not limited to, threaded connection, snap-fit ​​connection, adhesive bonding, etc.

[0064] 8 and 9 , the intermediate member 90 is secured to the receptacle 40d of the outer cover assembly 100 for the rear lower left spacer 50d by an interference fit, together defining an inner housing space 11d for receiving the spacer 50d. As shown in FIG9 , the inner housing space 11d is defined by a z-direction inner surface 144, an x-direction inner surface 143 (provided by the intermediate member 90), and a y-direction inner surface 146.

[0065] Specifically, the intermediate member 90 includes a body 92 having a predetermined thickness (e.g., which may be equal to the dimensional difference to be compensated) and a handle 94 extending from the body 92 for mounting within the receptacle 40d. The receptacle 40d may define a recess 44. The handle 94 extends into the recess 44 and forms an interference fit therewith to secure the receptacle 40d. For example, in a cross-section perpendicular to the direction in which the handle 94 is inserted into the recess 44, the handle 94 may have a cross-sectional shape, such as a quadrilateral, and may have at least one pair of opposing surfaces that form an interference fit with corresponding surfaces of the recess 44. In the illustrated embodiment, two side surfaces 942 and 944 ( FIG. 9 ) of the handle 94 form a gap with the opposing surfaces of the recess 44, while another pair of side surfaces, not shown, are interference fit with corresponding surfaces of the recess 44. In the illustrated embodiment, the extended length of the handle 94 may be equal to the depth of the recess 44 or, as shown, may be less than the depth of the recess 44.

[0066] The above embodiment illustrates a case where only a single, integral intermediate member 90 is included. Those skilled in the art will appreciate that, for the sake of flexibility, one or more shims of varying thicknesses may be provided. The shims may have substantially the same outer contour as the intermediate member 90, and depending on the structure of the intermediate member 90, the shims may include features for attachment to the intermediate member 90. For example, the shims may be formed with a hole through which the handle 94 of the intermediate member 90 passes. The shims may be positioned between the intermediate member 90 and the corresponding receptacle 40d, or affixed to the side of the intermediate member 90 facing the inner housing assembly 200. Alternatively, a set of shims of varying thicknesses may be provided to accommodate varying dimensional differences between the various receptacles.

[0067] The illustrated embodiment uses the intermediate member 90 as an example to compensate for the x-dimensional difference of the receptacle 40d. However, it is also conceivable that the receptacle 40d may also require dimensional compensation in one or both of the other two directions (z and y). In this case, the intermediate member 90 can be designed in an "L" shape to provide compensation in two of the two directions.

[0068] It is also contemplated that two or three separate intermediate pieces 90 may be attached to the receptacle in the same or different manner than that shown to provide three inwardly facing surfaces for contacting the three outer side surfaces of respective spacers.

[0069] The hexahedral spacers have been described in detail above with reference to the accompanying drawings, using hexahedral spacers as an example. As described in detail above, a plurality of hexahedral spacers are arranged on the outer periphery of the inner housing assembly, and all of the spacers are offset outwardly from the damping device of the pendulum assembly when viewed upward in the z-direction from below the inner housing assembly. In other words, all of the spacers are offset from the damping device in the z-direction. Thus, when the laser level is dropped and subjected to an upward impact, when the upward displacement of the outer cover assembly relative to the inner housing assembly reaches a predetermined value, the impact pulse or energy will be transmitted through the elastically deformed spacers to the contact areas (surfaces) of the inner housing assembly, causing deformation therein. However, the central area of ​​the bottom wall of the inner housing assembly, located directly below the damping device, will not be deformed. This effectively prevents internal components of the laser level (e.g., the pendulum assembly, particularly the high-precision components thereon) from being affected by this impact energy and causing stress or crushing damage. Arranging the spacers at the outer corners of the inner housing assembly, for example in a quadrilateral arrangement, not only absorbs and cushions upward impact energy in the z-direction, but also absorbs and cushions inward impact energy in the y- and x-directions, achieving all-around protection for the laser level. Preferably, the spacers are made of a mixed foam polyurethane elastomer with isotropic elastic properties to provide the same level of all-around protection for the laser level. The present application designs each spacer as a regular hexahedron and designs the contact surfaces provided by the inner and outer housing assemblies (and their receptacles) as squares. This greatly simplifies the spacer sizing or rule selection process. The dimensions of the required contact surfaces of the inner and outer housing assemblies can be easily calculated based on material performance parameters (e.g., static load, energy absorption, linear compression ratio, etc.), a predetermined drop height (e.g., for contact surfaces perpendicular to the z-direction), and a predetermined deformation (compression) of the spacers. Each surface of each spacer is arranged parallel to the coordinate plane, maximizing the efficiency of the spacer in absorbing impact energy.

[0070] Although this embodiment provides the above advantages, the applicant also provides some other implementation methods for the purpose of coping with z-direction drop impact.

[0071] For example, it is conceivable that each spacer may be in the form of a cylinder or an elliptical cylinder with a central axis extending in the z-direction. In this case, each spacer includes a z-inner surface (the upper surface of the lower spacers 50a-50d and the lower surface of the upper spacers 50e-50h) and a z-outer surface (the lower surface of the lower spacers 50a-50d and the upper surface of the upper spacers 50e-50h) that are opposite in the z-direction, and further includes an outer peripheral surface extending in the z-direction and connecting the z-inner surface and the z-outer surface. Accordingly, the inner housing assembly 200 includes a z-direction outward surface (e.g., surface 222 in FIG. 3 ) for contacting the z-direction inner side surface and a circumferential outward surface that contacts at least a portion of the inner portion of the outer peripheral surface facing the pendulum assembly or is opposite to it with a gap; the outer cover assembly 100 includes a z-direction inward surface (e.g., surface 124 in FIG. 3 ) for contacting the z-direction outer side surface and a circumferential inward surface that contacts at least a portion of the outer portion of the outer peripheral surface facing away from the pendulum assembly or is opposite to it with a gap.

[0072] For cylindrical or elliptical cylindrical spacers, the principles of operation and details of the stop structure are similar to those described above with reference to the accompanying drawings for hexahedral spacers. For example, it is contemplated that when the upward or downward displacement distance of the outer cover assembly 100 relative to the inner housing assembly 200 in the z-direction reaches a predetermined value, the stop structure that prevents the displacement distance from further increasing may include: the z-direction outward surface of any spacer of the inner housing assembly mating with the circumferential inward surface of the outer cover assembly, and / or the circumferential outward surface of the inner housing assembly mating with the z-direction inward surface of the outer cover assembly. It will be readily understood by those skilled in the art that, regardless of whether the illustrated hexahedral spacer or a spacer with another structure is used, the stopping structure does not necessarily have to be provided by the contact surfaces of the inner housing assembly 200 and the outer cover assembly 100 with the spacer. Instead, any portion of the inner housing assembly 200 (e.g., a protrusion extending therefrom) and any portion of the outer cover assembly 100 (e.g., a protrusion extending therefrom) can serve as the above-mentioned stopping structure as long as they can be combined with each other to provide the function of the stopping structure.

[0073] In some embodiments, the present application also contemplates an integral bottom spacer where the spacer extends around the outer periphery at the bottom of the inner housing assembly and an integral top spacer where the spacer extends around the outer periphery at the top of the inner housing assembly.

[0074] In some embodiments, in addition to providing eight spacers at the eight corners, additional spacers may be provided between adjacent spacers to absorb or buffer impact pulses or energy directed in only one direction. For example, an intermediate spacer may be provided on the bottom edge of the left sidewall of inner housing assembly 200, between spacers 50a and 50b, to buffer upward impacts in the z-direction and, optionally, rearward impacts in the y-direction.

[0075] In some embodiments, depending on the actual structure of the inner housing assembly 200, the four spacers 50a-50d for absorbing upward impacts can be replaced by two long strip-shaped spacers arranged opposite each other in the y-direction or the x-direction, which extend across the entire inner housing assembly 200 in the x-direction or the y-direction, respectively. The same applies to the four spacers 50e-50h for absorbing downward impacts.

[0076] Although the embodiments of the present application are described above in detail with reference to the accompanying drawings, those skilled in the art can make various modifications or substitutions to the above embodiments based on the teachings of the present application without departing from the scope of the present application.

Claims

1. A laser level, comprising: an outer housing assembly (100); an inner housing assembly (200) located inside the outer housing assembly; a pendulum assembly (300) supported within the inner housing assembly, which includes a damping device disposed adjacent to the bottom wall of the inner housing assembly; and a spacer that supports the inner housing assembly within the outer housing assembly and is made of an elastically deformable material, wherein the spacer includes a first spacer that is compressed when the outer housing assembly is displaced upward relative to the inner housing assembly and a second spacer that is compressed when the outer housing assembly is displaced downward relative to the inner housing assembly, wherein, when viewed along the z-direction, the first spacer and the second spacer are arranged along the outer perimeter of the inner housing assembly and are offset outward from the damping device of the pendulum assembly, wherein the spacer includes opposite z-direction inner surfaces and z-direction outer surfaces that face and are away from the pendulum assembly in the z-direction, and the inner housing assembly and the outer housing assembly respectively include z-direction outer surfaces and z-direction inner surfaces for contacting the z-direction inner surfaces and the z-direction outer surfaces to compress the first spacer and the second spacer respectively when the outer housing assembly is displaced upward and downward relative to the inner housing assembly in the z-direction, wherein the outer housing assembly and the inner housing assembly include mating upward stop features such that when the upward displacement distance of the outer housing assembly relative to the inner housing assembly in the z-direction reaches a preset value, the displacement distance is prevented from further increasing.

2. The laser level according to claim 1, wherein, the first spacer and the second spacer respectively include four first spacers and four second spacers arranged at four outer corners of the inner housing assembly when viewed along the z-direction.

3. The laser level according to claim 2, characterized in that at least one of the following: in the z-direction, the first spacer is disposed at the bottom wall of the inner housing assembly, and the second spacer is disposed at the top wall of the inner housing assembly; the z-direction outer surface of the first spacer is not lower than the bottommost surface of the inner housing assembly (200) in the z-direction; and / or the z-direction outer surface of the second spacer is not higher than the topmost surface of the inner housing assembly in the z-direction.

4. The laser level according to claim 3, wherein, both the first spacer and the second spacer are in the form of a hexahedron, and the hexahedron includes the z-direction inner surface and the z-direction outer surface extending perpendicular to the z-direction, the y-direction inner surface and the y-direction outer surface extending perpendicular to the y-direction, and the x-direction inner surface and the x-direction outer surface extending perpendicular to the x-direction.

5. The laser level according to claim 4, wherein, the inner housing assembly and the outer housing assembly respectively include x-direction outer surfaces and x-direction inner surfaces that are opposite to or in contact with the x-direction inner surface and the x-direction outer surface of each spacer; and the inner housing assembly and the outer housing assembly respectively include y-direction outer surfaces and y-direction inner surfaces that are opposite to or in contact with the y-direction inner surface and the y-direction outer surface of each spacer.

6. The laser level according to claim 5, wherein, The cooperating upward stop features include: A first upward stop feature constituted by the following two: (1) at least one of the x-direction inner surface and the y-direction inner surface of the at least one first spacer provided by the outer housing assembly, or other parts of the outer housing assembly; and (2) the z-direction outer surface of the first spacer provided by the inner housing assembly, or other parts of the inner housing assembly, which are designed to interfere with each other when the upward displacement distance of the outer housing assembly relative to the inner housing assembly reaches a preset value; and / or A second upward stop feature constituted by the following two: (1) at least one of the x-direction outer surface and the y-direction outer surface of the at least one first spacer provided by the inner housing assembly; and (2) the z-direction inner surface of the first spacer provided by the outer housing assembly, which are designed to interfere with each other when the upward displacement distance of the outer housing assembly relative to the inner housing assembly reaches a preset value.

7. The laser level according to claim 5 or 6, wherein, The x-direction outer surface, y-direction outer surface and z-direction outer surface of the inner housing assembly respectively entirely cover the corresponding surfaces of the corresponding spacers; each of the x-direction inner surface, y-direction inner surface and z-direction inner surface of the outer housing assembly only covers a part of the corresponding surface of the corresponding spacer.

8. The laser level according to claim 5 or 6, wherein, For each spacer, The inner surfaces of the outer housing assembly are provided by seats protruding inwards from the outer housing assembly or intermediate members attached to the seats, and / or The outer surfaces of the inner housing assembly are provided by seats protruding outwards from the inner housing assembly or intermediate members attached to the seats.

9. The laser level according to claim 8, wherein, The intermediate member includes a body with a specific thickness and a handle portion extending from the body, and the seat includes a groove, and the handle portion is inserted and fastened into the groove; and / or The intermediate member further includes a set of gaskets with different thicknesses.

10. The laser level according to claim 2, wherein, Each spacer is a cylinder or an ellipsoid with a central axis extending in the z-direction, and includes an outer peripheral surface connecting the z-direction inner surface and the z-direction outer surface, and the outer peripheral surface includes an inner part and an outer part facing and departing from the pendulum assembly, The inner housing assembly further includes a circumferential outer surface for facing or contacting at least a part of the inner part, and the outer housing assembly further includes a circumferential inner surface for opposing or contacting at least a part of the outer part, Preferably, the cooperating upward stop structure includes: the z-direction outer surface of the inner housing assembly and the circumferential inner surface of the outer housing assembly, and / or, the circumferential outer surface of the inner housing assembly and the z-direction inner surface of the outer housing assembly.

11. The laser level according to claim 1, wherein, The first spacer and the second spacer are respectively annular spacers extending around the entire periphery of the inner housing assembly, Preferably, the first spacer and the second spacer each have a cross-section in an oblong or quadrilateral shape.

12. A laser level, comprising: an outer housing assembly (100); an inner housing assembly (200) located inside the outer housing assembly; and a pendulum assembly (300) within the inner housing assembly, wherein the inner housing assembly is supported within the outer housing assembly by eight spacers, the eight spacers including four lower spacers disposed at four corners of the outer periphery near its bottom and four upper spacers disposed at four corners of the outer periphery near its top, and the eight spacers are all made of an elastically deformable material, wherein the inner housing assembly defines an outer accommodation space for each spacer, which defines a z-direction outward surface for contacting the z-direction inner surface of the corresponding spacer; the outer housing assembly defines an inner accommodation space for receiving each of the upper and lower spacers, which includes a z-direction inward surface for contacting the z-direction outer surface of the corresponding spacer, wherein the inner accommodation space of the outer housing assembly and the outer accommodation space of the inner housing assembly are configured to allow the outer housing assembly to be displaced relative to the inner housing assembly in either of two opposite orientations in any one of the x-direction, y-direction, and z-direction, wherein the outer housing assembly and the inner housing assembly include mating upward stop features such that when the outer housing assembly is displaced upward in the z direction relative to the inner housing assembly against the elastic deformation force of the lower spacer by a preset amount, the further increase in the displacement distance is prevented.

13. The laser level according to claim 12, wherein, for at least one of the lower spacers, the inner accommodation space of the outer housing assembly further includes a y-direction inward surface for opposing or contacting the y-direction outer surface of the corresponding spacer, and an x-direction inward surface for opposing or contacting the x-direction outer surface of the corresponding spacer, wherein at least one of the y-direction inward surface and the x-direction inward surface of the outer housing assembly is designed in size such that when the upward displacement distance of the outer housing assembly reaches a preset amount, it interferes with the z-direction outward surface of the inner housing assembly or other parts of the inner housing assembly to provide the mating upward stop feature.

14. A laser level, comprising: an outer housing assembly (100); an inner housing assembly (200) located inside the outer housing assembly; and a pendulum assembly (300) supported within the inner housing assembly, wherein the inner housing assembly is supported within the outer housing assembly by eight spacers made of an elastically deformable material disposed at eight corners of its exterior, wherein each spacer is clamped between the z-direction outward surface of the inner housing assembly (200) and the z-direction inward surface of the outer housing assembly (100) in the vertical z-direction, and in any direction perpendicular to the z-direction, it is opposite to or in contact with the corresponding surfaces of the inner housing assembly (200) and the outer housing assembly (100), such that the outer housing assembly (100) is allowed to be displaced towards the inner housing assembly (200) in any direction. Wherein, the outer housing assembly (100) and the inner housing assembly (200) further include a stop feature that interferes with each other when the distance of the outer housing assembly (100) shifting towards the inner housing assembly (200) reaches a preset threshold to prevent the outer housing assembly (100) from further shifting towards the inner housing assembly (200).

15. The laser level according to claim 14, wherein, each spacer has a hexahedron shape, and any direction perpendicular to the z-direction is either the x-direction or the y-direction which are perpendicular to each other; or each spacer has a cylindrical or conical shape with a central axis extending along the z-direction, and any direction perpendicular to the z-direction is any radial direction around the z-direction; or each spacer is clamped between the specific outward surface of the inner housing assembly (200) and the specific inward surface of the outer housing assembly (100) in any direction perpendicular to the z-direction and perpendicular to each other (the x-direction and the y-direction).

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