JPH09287902A - Electric tape measure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve electric operation of pulling out or in a measure housed in a case. SOLUTION: A case 1 incorporates a drum 3 having a measure 2 wound thereon, a micromotor 5 successively linked to the drum through a power transmission means 4 and a dry battery 6 of a power source, and a reversible switch 7 is provided on the surface of the case. The drum 3 is rotated either normally or oppositely with the driving of a micromotor 5 by the operation of the switch to move the measure 2 into or out of the case. The rotation of the drum 3 is normally performed by a friction force of a friction plate interposed between a final gear 8 and the drum 3 of a gear device for transmitting power.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric tape measure in which a tape measure stored in a case is electrically taken in and out.

[0002]

2. Description of the Related Art In a conventional case-storing tape measure, a drum around which a tape measure is wound is housed in a case, and the tape measure is manually pulled out, and unwinding and storing it in the case is attached to the drum. It was done by the reaction force of the spring.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to both electrically pull out and pull in a tape measure stored in a case.

[0004]

The means adopted by the present invention will be described with reference to the accompanying drawings. According to the present invention, the case 3 has a drum 3 around which a tape measure 2 is wound, and a power transmission means for the drum. 4 is provided with a micromotor 5 connected in series and a dry battery 6 of a power source, a forward / reverse switch 7 is provided on the surface of the case 1, and the drum 3 is forwardly / reversely driven by driving the micromotor 5 by operating the switch. The present invention relates to an electric tape measure characterized in that the tape measure 2 can be put into and taken out of the case by rotating the tape measure in either direction.

Further, according to the present invention, in the above-mentioned electric tape measure, a gear device is used for the power transmission means 4, and a friction plate 9 is fixed to one surface of either the final gear 8 or the drum 3, and the friction plate is used. The gear 8 and the drum 3 are brought into face-to-face contact with each other via a nut, and an elastic body such as a leaf spring 12 is interposed between the nut 11 provided on the rotating shaft 10 of the gear 8 and the gear 8 so that the gear 8 can be rotated. It is characterized in that the drum 3 is rotated by a frictional force due to the interposition of the friction plate 9.

[0006]

[Operation] The main operation of the above configuration will be described. When the forward / reverse switch 7 is operated in the positive direction, the micromotor 5 rotates in the forward direction, and accordingly, the gear 8, the nut 11, and the leaf spring 12 simultaneously rotate, and the friction of the friction plate 9 interposed between the gear 8 and the drum 3 is caused. The drum 3 is rotated by the force, and the tape measure 2 is sent out of the case. When the forward / reverse switch 7 is operated in the reverse direction, the micromotor 5, the gear 8 and the drum 3 rotate in the reverse direction, and the tape measure 2 is drawn into the case. Pulling out the tape measure 2 by rotating the drum 3,
Or, even if the switch is still pressed after the rotation of the drum is stopped after the pulling-in is completed, in this case, the gear 8 only slip-rotates on the drum via the friction plate 9. , No damage to the micromotor.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The present invention is embodied in the form illustrated. The micromotor 5, the dry battery 6, and the forward / reverse switch 7 are connected by an electric wire (not shown). The gear device, which is the power transmission means of the micromotor, comprises gears 13, 14, 15 and 8. In this embodiment, the final gear 8 is the leaf spring 1.
The pressing force of 2 urges the drum 3 toward the drum 3, and a friction plate 9 fixed to one surface of the gear 8 comes into contact with the drum 3. The nut 11 adjusts the pressing force of the leaf spring 12.
A stopper 16 is attached to the tip of the tape measure 2.

[0008]

According to the present invention, the tape measure can be taken in and out by operating the switch with one hand, so that the other hand is free and any operation can be performed. In the conventional product, the tape measure is retracted by the reaction force of the spring, so that the tape measure is rapidly retracted at once, which is dangerous, but according to the present invention, the tape measure can be retracted in small steps like the drawer. In this invention, the tape measure is taken in and out electrically, but since the drum is rotated by the frictional force due to the interposition of the friction plate, there is no fear that the micromotor will be damaged even if the switch is erroneously operated, as described above. .

[Brief description of drawings]

FIG. 1 is a front view showing an internal structure of a case of the invention product.

FIG. 2 is likewise a right side view.

FIG. 3 is likewise a left side view.

[Explanation of symbols]

1 ... Case, 2 ... Tape measure, 3 ... Drum, 4 ... Power transmission device, 5 ... Micromotor, 6 ... Dry battery, 7 ...
Forward / reverse switch, 8 ... Gear, 9 ... Friction plate, 10 ... Rotating shaft, 11 ... Nut, 12 ... Leaf spring.

Claims (2)

[Claims] 1. A drum (3) wound with a tape measure (2) in a case (1), a micromotor (5) connected to the drum via a power transmission means (4), and a power source. A dry battery (6) is provided, a forward / reverse switch (7) is provided on the surface of the case (1), and the drum (3) is rotated in either forward or reverse direction by driving the micromotor (5) by operating the switch. An electric tape measure characterized in that the tape measure (2) can be taken in and out of the case. 2. A gear device is used for the power transmission means (4),
A friction plate (9) is fixed to one surface of either the final gear (8) or the drum (3), and the gear (8) and the drum (3) are brought into face-to-face contact with each other via the friction plate. ), The gear (8) is moved in the direction of the drum (3) by interposing an elastic body such as a leaf spring (12) between the nut (11) provided on the rotary shaft (10) and the gear (8). The electric tape measure according to claim 1, wherein the drum (3) is rotated by a frictional force due to the interposition of the friction plate (9).