Abstract:
A measuring device includes a bracket, a sliding ruler, a securing assembly, and a driving assembly. The bracket includes a first set of scale lines. The sliding ruler is slidably attached to the bracket and includes a second set of scale lines. The securing assembly includes a securing member and a resilient member mounted to the securing member. The driving assembly is rotatably attached to the bracket and includes a handle and a gear secured to the handle. The gear is rotatable to slide the sliding ruler relative to the bracket; the securing member is secured to the bracket, and the resilient member is secured between the sliding ruler and the bracket, to prevent the sliding ruler from sliding relative to the bracket.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present disclosure relates to measuring devices, and particularly to a height measuring device. 
         [0003]    2. Description of Related Art 
         [0004]    In some tests, such as a noise power test, a plurality of microphones are placed on different positions, which have different heights from a ground. In a noisy laboratory, a ruler is used to measure the different heights and point different positions corresponding to each height. However, when the height is higher than a range of the ruler, one more ruler is used, which is inconvenient. Therefore, an improved measuring device may be desired. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0005]    Many aspects of the embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
           [0006]      FIG. 1  is an exploded, isometric view of one embodiment of a measuring device. 
           [0007]      FIG. 2  is an assembled, isometric view of the measuring device of  FIG. 1 . 
           [0008]      FIG. 3  is similar to  FIG. 2 , but viewed from a different aspect. 
           [0009]      FIG. 4  is a top view of the measuring device of  FIG. 2 . 
       
    
    
     DETAILED DESCRIPTION 
       [0010]    The disclosure is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings in which like references indicate similar elements. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean at least one. 
         [0011]      FIGS. 1-3  show a measuring device in accordance with an embodiment. The measuring device includes a bracket  10 , a sliding ruler  20 , a securing assembly  30 , and a driving assembly  50 . 
         [0012]    The bracket  10  includes a base  11 , a top plate  12 , a rear plate  13 , a first side plate  15 , and a second side plate  16  opposite to the first side plate  15 . In one embodiment, the base  11  is substantially parallel to the top plate  12  and substantially perpendicular to the rear plate  13 , the first side plate  15  and the second side plate  16 , and the rear plate  13  is substantially perpendicular to the first side plate  15  and the second side plate  16 . 
         [0013]    The base  11  includes a first side surface  111  and a second side surface  112 . Top plate  12  defines an opening  121 . In one embodiment, the first side surface  111  is substantially perpendicular to the second side surface  112 . The first side plate  15  defines a locking hole  151  and a first installation hole  153 . A support plate  110  connects the first side plate  15  and the base  11 . The second side plate  16  defines a second installation hole  161 . The second installation hole  161  is aligned with the first installation hole  153 . A sliding space  18  is defined by the rear plate  13 , the first side plate  15 , and the second side plate  16 . In one embodiment, the base  11  is rectangular. 
         [0014]    A bottom surface of the base  11  intersects the first side surface  111 , at a first edge  115 , and intersects the second side surface  112 , at a second edge  116 . An outer surface of the second side plate  16  is coplanar with the first side surface  111 . An outer surface of the rear plate  13  is coplanar with the second side surface  112 . The outer surface of the second side plate  16  intersects the outer surface of the rear plate  13  at a third edge  117 . The first edge  115 , the second edge  116 , and the third edge  117  intersect at a first point O. The outer surface of the rear plate  13  designs a first set of scale lines. The first set of scale lines includes a plurality of first scale values. The first point O is an origin of the first set of scale lines. The plurality of first scale values increase gradually from bottom to top. The outer surface of the second side plate  16  designs a second set of scale lines. The second set of scale lines includes a plurality of second scale values. The first point O is an origin of the second set of scale lines. The plurality of second scale values increase gradually from bottom to top. A largest first scale value and a largest second scale value are N. 
         [0015]    The sliding ruler  20  includes a rear wall  21 , a top wall  22 , a front wall  23  opposite to the rear wall  21 , a first sidewall  25 , and a second sidewall  26  opposite to the first sidewall  25 . The top wall  22 , the rear wall  21  and the second sidewall  26  intersect at a second point C. The first sidewall  25  defines a sliding slot  251 . The sliding slot  251  extends to the top wall  22  and includes a limiting end  253 . The front wall  23  defines a slot (not labeled). An extending direction of the slot is substantially perpendicular to the top wall  22 . A plurality of teeth  231  are located in the slot. The second sidewall  26  designs a third set of scale lines. The third set of scale lines includes a plurality of third scale values. The second point C is an origin of the third set of scale lines. The rear wall  21  designs a fourth set of scale lines. The fourth set of scale lines includes a plurality of fourth scale values. The second point C is an origin of the fourth set of scale lines. A scale value corresponding to the second point C is N. Each of the plurality of third scale values and the plurality of fourth scale values increase gradually from top to bottom. 
         [0016]    The securing assembly  30  includes a securing member  31  and a resilient member  32 . The securing member  31  includes a securing portion  311 , a blocking portion  312 , and a ring-pull  313 . The ring-pull  313  and the securing portion  311  are located on two opposite sides of the blocking portion  312 . The securing portion  311  includes a plurality of outer threads. The ring-pull  313  can be used for conveniently operating the securing member  31 . The resilient member  32  can slip over the securing portion  311 . In one embodiment, the securing member  31  is a thumb screw, and the resilient member  32  is a spring. 
         [0017]    The driving assembly  50  includes a handle  51  and a gear  53 . The handle  51  includes an installation portion  511  and an operation portion  513 . The installation portion  511  can be secured to the gear  53 . The gear  53  defines a through hole  533  and a plurality of gear teeth  531 . 
         [0018]      FIG. 4  shows that, in assembly, the sliding ruler  20  is moved towards the bracket, and a bottom end of the sliding ruler  20  is aligned with the bracket  10 . The sliding ruler  20  is slid into the sliding space  18  through the opening  121 . The gear  53  is positioned between the first side plate  15  and the second side plate  16  and geared with the teeth  231 . The installation portion  511  is inserted through the first installation hole  153 , the through hole  533  and the second installation hole  161 , to secure the gear  53  to the bracket  10 . The handle  51  is secured to the gear  53 . The operation portion  513  is rotatable to rotate the gear  53 . The resilient member  32  is positioned between the first sidewall  25  and the first side plate  15 . A first end of the resilient member  32  is located in the sliding slot  251 . The securing portion  311  is engaged in the locking hole  151 . The resilient member  32  slips over the securing portion  311  and abuts the blocking portion  312 . The securing member  31  is rotated towards the bracket  10  to elastically deform the resilient member  32 . The resilient member  32  exerts elastic force to engage the sliding ruler  20  to the bracket  10  and prevent the sliding ruler from moving towards the first side plate  15 . 
         [0019]    In use, the base  11  of the bracket  10  is placed on a ground. The measuring device determines a plurality of positions, having different pre-setting distances from the ground. When the different pre-setting distances are smaller than or equal to the scale value N, the first set of scale lines and the second set of scale lines of the bracket  10  is capable of measuring the different pre-setting distances and determine the plurality of positions. When the different pre-setting distances are greater than the scale value N, the securing member  31  is rotated away from the first side plate  15 , the resilient member  32  rebounds to release the sliding ruler  20 . The gear  53  is rotated to slide upwards the sliding ruler  20 , until the third scale value and the fourth scale value are equal to each pre-setting distance. The securing member  31  is rotated towards the first side plate  15 , the resilient member  32  is elastically deformed to engage the sliding ruler  20  to the bracket  10 . Thus, a distance between the top wall  22  and the ground is equal to the pre-setting distance. Thus, the point can be determined. 
         [0020]    When the gear  53  is rotated to slide upwards the sliding ruler  20 , the limiting end  253  abuts the securing portion  311 , to prevent the sliding ruler  20  from sliding out of the bracket  10 . 
         [0021]    In one embodiment, the scale value N is 100 mm. Thus, users can look at the front horizontally at the scale values easily. 
         [0022]    It is to be understood, however, that even though numerous characteristics and advantages have been set forth in the foregoing description of embodiments, together with details of the structures and functions of the embodiments, the disclosure is illustrative only and changes may be made in detail, especially in matters of shape, size, and the arrangement of parts within the principles of the disclosure, to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.