Electric measuring tape

Abstract

The utility model relates to the technical field of tool measurement, and particularly discloses an electric measuring tape comprising a housing, one end of the interior of the housing is provided with a measuring tape accommodating cavity, the other end is provided with a power supply cavity, one end of the housing is also provided with an opening, and the opening is communicated with the measuring tape accommodating cavity; the roller is rotationally arranged in the measuring tape accommodating cavity; the motor is arranged in the cavity in the roller, the output end of the motor is connected with one end of the roller, and the other end of the motor is connected with the shell; the tape is wound on the outer wall of the roller, one end of the tape is fixedly connected with the outer wall of the roller, a rotating guide roller is arranged around the roller, and the outermost ring of the tape is bound by the rotating guide roller until the tape extends to the opening of the shell; the power supply assembly is arranged in the power supply cavity; the control circuit board is arranged in the shell; the control switch is arranged on the outer wall of the shell. The whole electric measuring tape provided by the utility model adopts the simplest and reasonable structure, so that the tape can smoothly, stably, freely and reliably zoom at a constant speed.

Description

TECHNICAL FIELD

[0001] The utility model relates to measuring tool technical field, concretely is a kind of electric tape measure. BACKGROUND

[0002] The demand for length measurement in human production and life has been long, in order to meet the simple length measurement of building, carpentry, tailor and other industries, soft tape measure, steel tape measure and other structures with simple structure, low cost, convenient to carry, but there are certain drawbacks, such as hand tape measure, hand force is difficult to maintain absolute stability and uniformity, easy to make tape measure stretch or shrink, and the speed of pulling and pushing is uneven, and hand shaking is also difficult to avoid, these will cause the measurement result to appear larger error, difficult to achieve the requirement of high-precision measurement, so for some high-precision measurement requirements need to be measured repeatedly, which will affect work efficiency, and the uneven force caused by frequent and rapid pulling and pushing will lead to the fatigue, deformation or even breakage of the internal spring of tape measure, resulting in the failure of normal winding of tape measure.

[0003] Later, a mechanism and electronic combination design proposed by Chinese patent CN94245836 multifunctional electric tape measure appeared on the market, the mechanism is built-in in the structure-related shell, with a winding shaft and a guide shaft, a worm-driven permanent magnet motor as a power source, after power on, the magnetic field generated by the permanent magnet interacts with the power coil, so that the motor shaft drives the worm to rotate, and the output stable power can meet the requirements of the winding shaft of the tape measure, the worm gear sleeve of the winding shaft of the tape measure, and the over clutch installed between the worm gear and the winding shaft sleeve of the tape measure, so that the power is normally transmitted, the tape measure is wound, and the button switch with automatic reset for controlling the movement of the tape measure is controlled, and the series battery is matched, which solves the shortcomings of manual pulling and pulling tape measure, but the structure is complex, too many internal functions are added, resulting in complex structure, too many measuring instruments arranged in the shell, causing the decline of structure firmness and stability, the most important problem is that the transmission design of the patent electric tape measure has the greatest disadvantage, only relying on the forward and reverse rotation of the motor to realize the stretching and shrinking of the tape, in actual application, the tape cannot be smoothly put out or retracted at the expected speed due to the tape expansion phenomenon, greatly affecting the original intention of electric tape design, which is to provide convenience for users and normal use and measurement.

[0004] With the improvement of the electric tape measure in all aspects, the Chinese patent CN200610051847 provides an electric tape measure, the tape core is wound with a tape, one end of the tape is extended outside the tape shell through the opening on the tape shell, the motor in the tape core drives the large tape roller on the tape core and the tape respectively through the transmission mechanism, wherein the motor, the power supply part and the control switch are connected to form a control circuit for controlling the motor to rotate forward and backward.

[0005] The important features of the above patent technical solution are that when the tape measure is in the unwinding and retracting mode, the motor starts to operate, the small gear of the motor shaft transmits power to other gears, and these complicated gears gradually increase the torque to pull out and retract the tape. During the whole process, gears of different sizes can change the transmission ratio to drive the tape to extend and retract, and the complicated gears reduce the expansion dead phenomenon of the tape (the tape is stuck), and the gear system ensures smooth power transmission. However, there are certain disadvantages. First, the internal structure of the electric tape measure with gear transmission is complex, which makes its volume and weight relatively large, and it is not convenient to carry. Moreover, it is not convenient to repair once a gear fails. Second, it is easily affected by the environment, and the internal gear structure is easily invaded by dust, sand and other impurities. Once these impurities enter between the gears, they will increase the friction and wear the gears, and even may cause the gears to be stuck, affecting the normal work of the tape measure. Finally, the cost is high. Due to the complex structure, including multiple gears and other parts, the production cost of this electric tape measure is high, and the price is usually much higher than that of ordinary tape measures, which also limits its market popularization degree. Practical new type content

[0006] To solve the above problems, the utility model adopts the following technical solutions.

[0007] An electric tape measure, comprising an outer shell, one end of the inner shell is provided with a tape measure containing cavity, the other end is provided with power cavity, one end of the outer shell is also provided with an opening, the opening is communicated with the tape measure containing cavity; a roller is rotationally arranged in the tape measure containing cavity, a plurality of guide rollers are arranged around the roller, both ends of the guide rollers are rotationally connected with the inner wall of the outer shell; an electric motor is arranged in the cavity inside the roller, the output end of the electric motor is connected with one end of the roller, the other end of the electric motor is connected with the shell; a tape is wound on the outer wall of the roller, one end of the tape is fixedly connected with the outer wall of the roller, the other end of the tape is extended from the opening, the tape is arranged in the space enclosed by the plurality of guide rollers; a power supply assembly is arranged in the power cavity; a control circuit board is arranged in the inner shell; a control switch is arranged on the outer wall of the outer shell, the control switch, the power supply assembly and the electric motor are respectively connected with the control circuit board.

[0008] As a preferred, the outer shell comprises a half shell one and a half shell two, a cylinder shaft is fixedly arranged on the inner wall of the half shell one, the roller is rotationally arranged on the cylinder shaft, and the electric motor is arranged in the cylinder shaft.

[0009] As preferred, a large bearing is arranged on the cylinder shaft between the drum and the half shell one.

[0010] As preferred, the output shaft of the motor extends out of the drum and is rotationally connected with the half shell two through a small bearing.

[0011] As preferred, a roller is rotationally arranged inside the opening, and the measuring tape is placed above the roller.

[0012] As preferred, a plurality of guide rollers are arranged around the drum, and two ends of the guide rollers are rotationally connected with the inner wall of the shell.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] The utility model discloses, guide roller distribution is in the drum all around, when the tape, the measuring tape will instantaneously from the inner ring to the outer ring and expand, the outermost circle of measuring tape will be close to the guide roller at this moment, utilize the rotation of guide roller to greatly resolve the frictional force of tape due to the expansion of the ruler, effectively prevent the tape twist and jam when the tape, also make the measuring tape more smooth, in the true sense with simple and reasonable structure, realize the measuring tape to put in and take out nimble and stable, reliable work, low cost, easy production, easy maintenance, pricing reasonable easy market popularization and user popularization.

[0015] The utility model discloses, the measuring tape generates very big friction when extending and retracting in the export, and the roller can make the measuring tape move smoothly, avoid the measuring tape and the export to be damaged due to direct friction, especially the measuring tape extends longer, and the friction of the measuring tape and the export will increase due to gravity, and the tape roller greatly reduces the friction, and can guide the measuring tape, ensure that the measuring tape can export and retract according to the correct direction, prevent the measuring tape from being stuck or twisted at the export. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 For the overall structure explosion of the utility model Figure One ;

[0017] Figure 2 For the overall structure explosion of the utility model Figure Two .

[0018] In the drawing: 1, shell, 2, measuring tape containing cavity, 3, power supply cavity, 4, opening, 5, drum, 6, motor, 7, measuring tape, 8, power supply assembly, 9, control circuit board, 10, control switch, 11, large bearing, 12, small bearing, 13, roller, 14, guide roller, 1-1, half shell one, 1-2, half shell two, 1-3, cylinder shaft. DETAILED DESCRIPTION

[0019] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present application shall fall within the scope of the present application.

[0020] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are merely for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be broadly understood, for example, "connected" can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be connected inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. Embodiment

[0022] As Figure 1 shown, in the present embodiment, an electric tape measure includes a housing 1, one end of the housing 1 is provided with a tape measure containing cavity 2, the other end is provided with a power cavity 3, the front end of the housing 1 is also provided with an opening 4, the opening 4 is in communication with the tape measure containing cavity 2, in the present example, the power cavity 3 is located at the holding portion of the housing 1;

[0023] A roller 5 is rotatably arranged in the tape measure containing cavity 2, a plurality of guide rollers 14 are arranged around the roller 5, both ends of the guide roller 14 are rotatably connected with the inner wall of the housing 1;

[0024] An electric motor 6 is arranged in the cavity inside the roller 5, the output end of the electric motor 6 is connected with one end of the roller 5, the other end of the electric motor 6 is connected with the housing 1;

[0025] A tape 7 is wound on the outer wall of the roller 5, one end of the tape 7 is fixedly connected with the outer wall of the roller 5, the tape 7 is arranged in the space enclosed by the plurality of guide rollers 14, and the outermost circle of the tape 7 is bound by the plurality of guide rollers 14 until it extends to the opening 4 of the housing 1.

[0026] The power supply assembly 8 is arranged in the power supply cavity 3, and in this embodiment, the power supply assembly 8 is a dry battery;

[0027] The control circuit board 9 is arranged inside the shell 1;

[0028] The control switch 10 is arranged on the outer wall of the shell 1, and the control switch 10, the power supply assembly 8, and the motor 6 are respectively connected with the control circuit board 9.

[0029] In this embodiment, the control switch 10 is designed at the front part of the upper end of the holding part, which is convenient for one-handed operation of the user, and one thumb can operate the use of the electric tape measure. The control switch 10 is divided into a control tape 7 extension switch and a control tape 7 retraction switch.

[0030] In this embodiment, the shell 1 includes a half shell one 1-1 and a half shell two 1-2. A cylinder shaft 1-3 is fixedly arranged on the inner wall of the half shell one 1-1. The roller 5 is rotatably arranged on the cylinder shaft 1-3, and the motor 6 is arranged in the cylinder shaft 1-3.

[0031] In this embodiment, a large bearing 11 is arranged on the cylinder shaft 1-3 between the roller 5 and the half shell one 1-1.

[0032] In this embodiment, the output shaft of the motor 6 extends out of the roller 5 and is rotatably connected with the half shell two 1-2 through a small bearing 12.

[0033] In this embodiment, a roller shaft 13 is rotatably arranged in the opening 4. The tape 7 is placed above the roller shaft 13. The roller shaft 13 can also be replaced by a small-diameter rotatable roller.

[0034] In this embodiment, eight guide rollers 14 are arranged around the roller 5. The two ends of the guide roller 14 are rotatably connected with the inner wall of the shell 1. In this embodiment, the guide roller 14 can be a roller shaft 13, or can be replaced by a roller.

[0035] In this embodiment, the tape 7 is connected with the roller 5 by locking. This can effectively prevent the tape 7 from being separated from the roller 5 when it is excessively stretched or retracted, reduce the risk of damage to the tape 7 caused by loose connection, and prolong the service life of the tape measure. Compared with other connection methods, the locking connection is more stable when bearing a larger tension, which can ensure the connection between the tape 7 and the roller 5, and make the tape 7 easy to control, which is convenient for flexible operation in different measurement scenarios.

[0036] The working principle and beneficial effects of the above technical solution are as follows:

[0037] In operation, the control switch 10 controls the motor 6 to rotate the roller 5 in forward and reverse directions, thereby controlling the winding of the tape 7.

[0038] In the embodiment, the guide rollers 14 are distributed around the drum 5, and when the tape 7 is being unwound, the tape 7 will be instantaneously expanded from the inner circle to the outer circle, at this time, the outermost circle of the tape 7 will be tightly attached to the guide rollers 14, and the rotation of the guide rollers 14 greatly resolves the frictional force generated due to the expansion of the tape, effectively prevents the tape 7 from being twisted and stuck during unwinding, makes the tape 7 more smooth, and truly realizes the unwinding and winding of the tape 7 with simple and reasonable structure, reliable work, low cost, easy production, easy maintenance, reasonable pricing, easy market promotion and user popularization.

[0039] In the embodiment, when the tape 7 is being extended and retracted, a great frictional force will be generated at the outlet, the roller 13 can make the tape 7 move smoothly, avoid the damage of the tape 7 and the outlet due to direct friction, especially when the tape 7 is extended longer, the frictional force between the tape 7 and the outlet will be increased due to gravity, and the unwinding roller 13 greatly reduces the friction and can guide the tape 7, so as to ensure that the tape 7 can be unwound and wound in the correct direction and prevent the tape 7 from being stuck or twisted at the outlet.

[0040] In the embodiment, the drum 5 is made into a hollow drum 5, and the motor 6 is arranged inside the drum 5, the motor 6 as a power part is installed in the hollow drum 5, so that the overall design structure is compact, space is saved, the layout is reasonable, the motor is protected, the risk of collision is reduced, dust and moisture are prevented, the measurement accuracy is improved in use performance, because the motor 6 is close to the winding shaft and the transmission path is short, the energy transmission efficiency is high, the influence of energy loss and mechanical error in the transmission process on the measurement accuracy is reduced, and the winding and unwinding of the tape 7 are more accurate.

[0041] In the embodiment, the left and right ends of the drum 5 adopt a double-bearing structure, which effectively reduces the friction when the winding shaft rotates, reduces the frictional resistance, supports the two ends of the drum 5, enables the drum 5 to rotate more flexibly, makes the winding and unwinding of the tape 7 more smooth and fluent, avoids the phenomenon of jamming, enhances the stability to a greater extent, maintains the balance of the drum 5, can uniformly bear the weight of the drum 5 and the tape 7, and this structure can better adapt to large-size tapes 7, and the double-bearing structure can better support and drive the winding and unwinding of the tape 7 for some electric tapes with large-size and thick specifications.

[0042] The above is only a preferred specific embodiment of the present application; however, the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and improvement concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. An electric measuring tape, characterized in that, include, The outer shell (1) has a measuring tape receiving cavity (2) at one end and a power supply cavity (3) at the other end. The outer shell (1) also has an opening (4) at one end, which is connected to the measuring tape receiving cavity (2). The roller (5) is rotatably disposed in the measuring tape receiving cavity (2). Several guide rollers (14) are arranged around the roller (5). The two ends of the guide rollers (14) are rotatably connected to the inner wall of the outer shell (1). The motor (6) is located in the cavity inside the drum (5). The output end of the motor (6) is connected to one end of the drum (5), and the other end of the motor (6) is connected to the outer shell (1). The ruler (7) is wound on the outer wall of the drum (5). One end of the ruler (7) is fixedly connected to the outer wall of the drum (5), and the other end of the ruler (7) extends out from the opening (4). The ruler (7) is set in the space enclosed by several guide rollers (14). The power supply component (8) is located inside the power supply cavity (3); The control circuit board (9) is located inside the housing (1); The control switch (10) is located on the outer wall of the housing (1). The control switch (10), the power supply component (8) and the motor (6) are respectively connected to the control circuit board (9).

2. The electric measuring tape according to claim 1, characterized in that, The outer shell (1) includes a first half shell (1-1) and a second half shell (1-2). A cylindrical shaft (1-3) is fixedly installed on the inner wall of the first half shell (1-1). A roller (5) is rotatably installed on the cylindrical shaft (1-3). A motor (6) is installed inside the cylindrical shaft (1-3).

3. An electric measuring tape according to claim 2, characterized in that, A large bearing (11) is provided on the cylinder shaft (1-3) between the roller (5) and the half shell (1-1).

4. An electric measuring tape according to claim 1, characterized in that, The output shaft of the motor (6) extends out of the drum (5) and is rotatably connected to the second half-shell (1-2) via a small bearing (12).

5. An electric measuring tape according to claim 1, characterized in that, A roller (13) is rotatably installed inside the opening (4), and a ruler (7) is placed above the roller (13).

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