JPH05817Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a digital display length measuring device used for purposes such as space measurement, interior measurement, and ceiling height measurement from the bottom in various types of construction work. be.

[Conventional technology]

Conventionally, a tape measure was mainly used for such purposes, but for example, when measuring the ceiling height from a survey surface,
They used a ladder or attached a tape measure to the tip of a bamboo pole, stretched it out with one hand, and took measurements while operating the tape measure with the other hand. Therefore, the measurement work is extremely complicated, and there are also disadvantages in that there are many errors in the measured values due to slack in the tape measure, etc.

Therefore, a measuring rod as disclosed in, for example, Japanese Utility Model Publication No. 11064/1983 has been devised. This is done by inserting a tape measure into the main body, which is expandable and retractable by inserting and inserting multiple cylindrical joints whose diameters gradually become smaller, so that they can move in and out. The tape measure can be freely pulled out and moved, and the scale of the tape measure can be read through the wire of the transparent joint. Therefore, by sequentially pulling out and elongating the joint rods, the length can be measured without using a ladder or the like, and by applying an unwinding force to the tape measure with a certain spring, there is no tension error, and the above-mentioned drawbacks can be solved. It is.

However, with the measuring rod, the scale of the tape measure is read through a small reading window, making it impossible to perform quick measurements. For example, it is difficult to immediately read whether it is 1 m 20 cm 5 mm or 1 m 15 cm 5 mm, and misreading often occurs.

Therefore, for example, in Japanese Utility Model Application Publication No. 59-60504,
The scale body is configured to be expandable and contractible, and the scale body is equipped with a measuring device that measures the length between both ends of the scale body, and a digital display device that displays the measured value obtained by the measuring device is attached to the scale body. A digital display length measuring device is disclosed. With this digital display length measuring device, measurements can be made simply by expanding and contracting the scale body to match the length of the object to be measured, and the measurement results are clearly displayed on the digital display, eliminating reading errors. It never occurs.

[Problem that the invention attempts to solve]

In the digital display length measuring device disclosed in the above-mentioned Japanese Utility Model Publication No. 59-60504, a pulse generator is installed coaxially with a drum around which a filament is wound, and the scale body is stretched. The pulse generator generates pulses as the drum rotates when the filament is pulled out from the drum or rewound onto the drum as the filament is lengthened or shortened. It is configured to detect the length between both ends. in this way,
The digital display length measuring device described in the same publication has a measuring device that includes a pulse generator and the like, which makes the configuration complicated and increases the manufacturing cost.

In addition, in the above digital display length measuring device, when the scale body is extended, the pulses generated from the pulse generator are counted up by a counter, and when the scale body is shortened, the pulses generated from the pulse generator are counted down by the counter, and the scale body is scaled. Although it measures the length between both ends of the body, it cannot be said that there will be no malfunctions while the scale body is repeatedly expanded and contracted.

This idea was made in view of the above circumstances, and is a digital display length measuring device that can be expanded and contracted by moving in and out of multiple rods with sequentially different diameter dimensions, and that has a simple configuration and displays measured values digitally. The present invention provides a digital display length measuring device that can be manufactured at a low cost, can effectively prevent erroneous measurements, and is especially suitable for measuring vertical dimensions such as the ceiling height of structures. This is the purpose.

[Means for solving problems]

In order to achieve the above-mentioned problems, the digital display length measuring device of this invention has a plurality of cylindrical length measuring rods whose diameters gradually become smaller, each of which can be moved in and out of the cylindrical external case rod in one direction. At the same time, each length measuring rod is provided with a locking mechanism that presses against the respective outer length measuring rod or external case rod, and length measuring points are arranged at regular intervals and the external case rod The tip of a length measuring tape that is rewindably wound inside the rod storage side of the case is inserted through the thinnest length measuring rod and fixed to the rod drawer side end of the rod. At the end of the drawer side, an initial state detection switch is attached, which is turned on by the end of the narrowest measuring rod on the drawer side and sets the count value to zero. A detection section that detects a dot and outputs it as an electrical signal, a counter section that counts the detection signal of this detection section, a control section that performs a desired calculation based on the count signal of this counter section, and an output of this control section. The main feature is a configuration including a display section that digitally displays a value measured by a signal.

[Effect]

With the above configuration, when each length measuring rod is moved in and out to expand and contract as a whole, the length measuring tape is moved in accordance with this expansion and contraction, and a number of length measurement points corresponding to the amount of movement of this length measuring tape is created. is detected by the detection unit and counted by the counter unit. This count signal is input to the control section, a desired calculation is performed, and the measured length value is calculated and digitally displayed on the display section. At this time, the control section calculates the count signal based on the point in time when the initial state detection switch is turned on and the count value is set to zero, so that erroneous measurements do not occur. When measuring the length, each length-measuring rod is stopped at an arbitrary position by the locking mechanism provided on each length-measuring rod, so that the length can be measured accurately.

〔Example〕

Hereinafter, embodiments of this invention will be explained in detail based on the drawings.

1 to 12 show one embodiment of this invention. 2 shows a rectangular cylindrical external case rod with a rectangular cross section, which is the base of the digital display length measuring device 1 of this invention, and the wide side of the rectangle at one end is open as shown in FIG. At the same time, a pair of storage cases 3a and 3b are opened with this opening closed.
is installed. Also, on one end surface of the external case rod 2, there is an L-shaped end fitting 4 that serves as a length measurement reference surface.
is bonded and fixed.

As shown in Fig. 4, five rectangular tube-shaped length measuring rods 5, 6, 7, 8, and 9 are fitted into the outer case rod 2, with diameters becoming smaller and lengths becoming shorter. It is inserted. Each of the measuring rods 5 to 8, excluding the external case rod 2 and the thinnest measuring rod 9, has a U-shaped cross section on the rod drawer side (the left side in Figures 1 to 4). A pair of bent end joint members 10, 11, 12, 13, 1
4 are fitted into a rectangular shape as shown in FIG. The dimensions of each pair of tip joint members 10 to 14 are such that each measuring rod 5 to 9 inserted therein can slide smoothly, and the outer surface of each tip joint member 10 to 14 is Respectively protruding locking protrusions 10a to 14
a corresponds to the locking holes 2a, 5a, 6a,
7a, 8a, each end joint member 1
0 to 14 are prevented from moving in the direction of the cylinder axis.

On the other hand, on the outer surface of the end of each length measuring rod 5 to 9 on the rod housing side, as shown in FIG. Locking mechanism parts 15, 16, 17, 18, which are in pressure contact with
19 is installed. Each of these locking mechanism parts 15
19 have the same configuration, so the locking mechanism section 15 of the outermost measuring rod 5 will be explained as an example.
As shown in FIG. 6, this locking mechanism section 15 is mainly composed of a pair of end joint members 20 having a U-shaped cross section and a pressure contact spring 21. a pair of guide pieces 20a provided at
0b, and a movement-blocking protrusion 20c formed on the intermediate inner surface of the other end. This locking mechanism part 1
A wide guide hole 5b into which each guide piece 20a of the both end joint members 20 is inserted is bored in the end edge of the long side rod 5 on the side of the rod storage direction to which the side long rod 5 is attached. An insertion hole 5c for the spring 21 is formed in the surface, and an engagement hole 5d is formed at a position corresponding to the protrusion 20c. and,
The spring 21 is inserted into the insertion hole 5c, and as shown in FIG. 7, the spring 21 is compressed from both sides by the engagement protrusions 20b, and the both end joint members 20 are placed over the side long rods 5, and the end joint is The member 20 is inserted into the external case rod 2 from the rear side with the guide piece 20a inserted into the guide hole 5b and the protrusion 20c fitted into the engagement hole 5d. Therefore, due to the restoring force of the compressed spring 21, both end joint members 20 are pressed outward as indicated by the arrow a in FIG. 7, and are pressed against the inner surface of the outer case rod 2. Here, by fitting the protrusion 20c into the engagement hole 5d, it moves together with the measuring rod 5, and by fitting the guide piece 20c into the guide hole 5b, it is prevented from falling off, and the lengthwise direction of the measuring rod 5 ( A pressing force is applied in the direction of arrow a). The other locking mechanisms 16 to 19 have exactly the same construction, but it goes without saying that their dimensions are adapted to the measuring rods 6 to 9 to which they are attached. However, the pressure applied by the spring 21 in the direction of the arrow a is gradually increased as the length of the measuring rods 5 to 9 increases.

With the above configuration, when each of the length measuring rods 5 to 9 enters and exits, the length measuring rods 5 on the outer side and the inner side respectively
~8 or without sliding contact with the entire opposing surface of the external case rod 2,
Tip joint members 10 to 14 and locking mechanism part 15
.about.19 are used as space members and are in sliding contact only at these two locations to reduce frictional force and slide smoothly, allowing each of the length measuring rods 5 to 9 to be moved in and out easily. Moreover, the locking mechanism section 1
The length measuring rods 5 to 9 come to rest at arbitrary positions due to the pressure contact forces 5 to 19, and when the length measuring rods 5 to 9 are pulled out to the maximum length, the locking mechanisms 15 to 19 engage the tip joint member 10.
It is prevented from coming off by coming into contact with ~14.

A length measuring tape 23 wound around a reel having a spiral spring 22 for rewinding is installed in the storage cases 3a and 3b, and this length measuring tape 23 is attached to a pressure roller 24 and a flanged roller 25. The horizontal and vertical vibrations are regulated to predetermined tolerance values by means of a roller means, the tip of which is inserted into the narrowest length measuring rod 9 and is integrally attached to the tip of this length measuring rod 9. It is fixed to the mounting portion 27 of 26. As shown in FIG. 9a, this length measuring tape 23 has length measuring point portions 23a consisting of through holes arranged at regular intervals. Therefore, the detection section 28 of this length measurement point section 23a is constituted by a light transmission type photointerrupter 28a. A battery case 30 is provided above the detection section 28 for mounting a battery 29 that serves as a driving power source for the detection section 28 and an electronic circuit mechanism to be described later.

On the other hand, a digital display section 31 and an operation key section 32 are provided on the surface of the end of the external case lever 2 on the lever drawer side. As the digital display section 31, a liquid crystal with low power consumption is used since the driving power source is the battery 29, and a lamp (not shown) is attached so that the display can be viewed even in a dark place. Further, as shown in FIG. 10, the operation key section 32 includes external setting keys 32a, 3 for power connection/disconnection, mode switching, lamp lighting, zero setting, and hold.
2b, 32c, 32d, and 32e are arranged. A control unit 33 consisting of a microcomputer is installed below the display unit 31, and the tip of the narrowest measuring rod 9 is installed at the tip of the rod drawer side when all measuring rods 5 to 9 are stored. An initial state detection switch 34 is provided which is turned on by contact with the metal fitting 26 to turn on the power. Above the detection switch 34, there is a recess 35 for making it easier to pull out the thinnest length measuring rod 9 from a state in which the length measuring rods 5 to 9 are completely housed and the tip fitting 26 is in contact with the external case rod 2. is formed. Moreover, one continuous center line 36 along the longitudinal direction is drawn at the center in the lateral direction of the same direction surface of the outer case rod 2 and each of the measuring rods 5 to 9.

Next, the operation of the embodiment configured as described above will be explained. When each length measuring rod 5 to 9 is pulled out according to the length to be measured, the tip ends at the attachment part 27 of the tip fitting 26.
The length measuring tape 23 attached to the length measuring rods 5 to 9
The length measuring tape 23 is moved according to the amount of withdrawal, and the number of measuring points 23a corresponding to the moving amount of the length measuring tape 23 is detected by the detecting section 28, and as shown in FIG.
8 detection signals are counted by a counting section 37 consisting of a counting IC. At this time, the moving direction of the length measuring tape 23 is detected by a direction determining circuit (not shown), and if it is in the direction of pulling out the rod, it is counted up (added), and if it is in the direction of storing the rod, it is counted down. This count signal is input to the control section 33 and calculated, and the control section 33 calculates the count signal based on signals from the preset value setting section 38, the initial state detection switch 34, and the operation key section 32. Ru. That is, when the initial state detection switch 34 is turned on, the count value becomes zero, and the count signal is calculated based on this point to prevent erroneous measurements. Since it is necessary to add the length from the tip end fitting 26 to the end fitting 4 in this state, the length in the fully retracted state is set in advance by the preset value setting section 38.

Next, the display by the operation of the operation key section 32 will be described. When the hold external setting key 32e is pressed, the display section 31
At this time, an "H" sign is displayed in the lower right corner of the display unit 31, and by pressing the hold external setting key 32e again, the hold is released and the current measured length is displayed.

When the zero setting external setting key 32d is pressed, the counter section 37 is reset to display "0" in any state. However, the mode at that time can be maintained as it is and automatically shift to the length measurement state. Also, usually Figure 11a
As shown in Figure 11, the meter unit is displayed and the M sign is displayed 31a, but when the mode switching external setting switch 32b is pressed, the controller 33 converts the value, as shown in Figures 11b to 11d.
The unit display is sequentially displayed as "shaku", "inch", "foot, inch, minute", and the signs 31b, S, IN, and FT-IN are displayed at the lower right of the display section 31, respectively.
31c and 31d are performed.

In addition, in height measurement, each length measuring rod 5 to 9 is pulled upward with the length measuring device 1 in a vertical state, so
The measuring rods 5 to 9 with larger downward dimensions must support a larger load, and correspondingly, as the measuring rods 5 to 9 have larger dimensions, the locking mechanism section 15
Since the pressure contact force of 1 to 19 is set to be large, each length measuring rod 5 to 9 comes to rest at an arbitrary position.

Furthermore, the center line 36 is used, for example, to measure dimensions for deforming a tatami mat in tatami processing. That is, as shown in FIG. 12, after aligning the center line 36 with a distance a of 1 inch from both end wall surfaces, the distance c from one end to the wall surface every half inch b,
Measure d. The tatami is then transformed based on the measured values.

It should be noted that this invention is not limited to the above-mentioned embodiment, and it goes without saying that various embodiments can be considered without departing from the scope of the claims.
As shown in Figure 3a, a length measuring tape 39 with dark mark length measuring points 39a arranged is used,
Accordingly, the detection section 40 may be configured using a reflective photointerrupter 40a as shown in FIG.

〔effect〕

As is clear from the above explanation, according to the digital display length measuring device of this invention, length can be measured with a simple operation of moving multiple length measuring rods in and out and expanding and contracting them as a whole. In the long instrument, each length measuring rod is equipped with a locking mechanism, so the length measuring rod is stationary at an arbitrary position and does not move accidentally, making it possible to measure vertical dimensions such as the ceiling height of a building. Even in such cases, accurate measurements can be made. It is also equipped with an initial state detection switch that sets the count value to zero when it is turned on.The control unit calculates the count signal based on the point at which the count value becomes zero, which prevents erroneous measurements. be able to. Furthermore, since digital display is performed without using an encoder or the like, there is an advantage that the structure is simple and can be manufactured at low cost.

[Brief explanation of the drawing]

Figures 1 to 12 show one embodiment of the digital display length measuring instrument of this invention, in which Figure 1 is a perspective view, Figure 2 is a plan view, Figure 3 is a front view, and Figure 4 is a second 5 is a sectional view taken along line BB of FIG. 3, FIG. 6 is a partial exploded perspective view, FIG. 7 is a partial perspective view, and FIG. 8 is a block diagram. Configuration diagram, Figure 9a,
Figure b is a plan view of the measuring tape and a schematic diagram of the detection unit, Figure 10 is a layout diagram of the keys in the operation key unit, and Figure 1 is a schematic diagram of the measuring tape.
Figures 1 a to d are all plan views of the display unit when switching modes, Figure 12 is an explanatory diagram of the usage state, and Figure 1
Figures 3a and 3b are a plan view of a length-measuring tape and a schematic diagram of a detecting section according to another embodiment of this invention. 1... Digital length measuring device, 2... External case rod,
5-9... Length measuring rod, 15-19... Locking mechanism section,
23, 39... Length measuring tape, 23a, 39a...
Length measurement point section, 26... Tip metal fitting, 28, 40... Detection section, 31... Display section, 32... Operation key section, 3
3...control unit, 34...initial state detection switch,
35... recess, 36... center line, 37...
...Counter section.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A plurality of cylindrical length measuring rods 5 to 9 having successively smaller diameters are inserted and inserted into the cylindrical external case rod 2 so as to be freely removable and retractable in one direction. , a locking mechanism section 15-1 is provided in pressure contact with each of the length measuring rods or the outer case rod.
9, and the tip of the length measuring tape 23 , which has length measuring points 23a arranged at regular intervals and is rewindably wound inside the rod housing side of the external case rod 2 ,
The rod drawer side end of the narrowest length measuring rod 9 is inserted into the narrowest measuring rod 9 and fixed to the rod drawer side end of the rod drawer side end of the external case rod 2 . a detection section 28 which is provided with an initial state detection switch 34 that is turned on by the section to zero the count value, and which detects each length measurement point section 23a as the length measurement tape 23 moves and outputs it as an electrical signal; A counter section 37 that counts the detection signal of this detection section, a control section 33 that performs a desired calculation based on the count signal of this counter section, and a display that digitally displays the value measured by the output signal of this control section. A digital display length measuring instrument characterized by comprising a section 31 . 2 Digital display length measurement according to claim 1 of the utility model registration claim, in which a single straight line 36 continuous in the longitudinal direction is displayed on the outer surface of the outer case rod 2 and each of the length measurement rods 5 to 9 . vessel. 3. The scope of the utility model registration claim, in which the pressure force of each of the locking mechanisms 15 to 19 provided on each measuring rod is increased in order from the narrowest measuring rod to the measuring rod with increasing diameter. The digital display length measuring device according to item 1 or 2. 4. Attach the tip metal fitting 26 to the end of the narrowest measuring rod 9 on the rod drawer side, and this metal tip abuts the initial state detection switch 34 to turn it on, thereby controlling the control unit 33 , the detection unit 28 ,
A digital display length measuring device according to any one of claims 1 to 3, which is a registered utility model and is configured to display an initial value on the display unit by energizing the display unit 31 or the like. 5. The digital display length measuring device according to claim 4, which is a utility model, in which a recess 35 for drawing out the tip metal fitting is formed on the edge of the outer case rod 2 on the rod drawer side. 6. A mode switching key 32b is provided as an external setting key, and the control unit 33 is provided with means for converting measured values into shaku, inch, and foot-inch units based on the metric unit by pressing the mode switching key. A digital display length measuring device according to any one of claims 1 to 5 of the utility model registration claims.