JPH0419442Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an automatic tape measure that can automatically feed out and pull in a measuring tape.

(Prior art) A conventional tape measure has a winding spring attached to the inside of a winding drum installed in a case, and this winding spring causes the measuring tape wound around the outer periphery of the winding drum to move. It is designed to be rolled up inside the case. An automatic tape measure has been proposed in which a motor or the like is attached to such a tape measure to automatically feed out the tape. (For example, see Utility Model Application Publication No. 56-54403).

(Problems to be solved by the invention) This automatic tape measure has a tape measure tape payout mechanism added to a tape measure with a conventional structure, and uses a conventional coil spring to pull in the tape measure, so the structure is different. There was a problem that the number of parts was large. Another problem was that even if the user wanted to pull in a certain amount of the tape measure tape that had been fed out, the tape would be taken up all at once by the take-up spring.

(Means for Solving the Problems) The automatic tape measure of the present invention includes a case body, a take-up drum provided inside the case body for winding up the measuring tape, and a winding drum provided on the side surface of the case body. In the tape measure, the winding drum is equipped with a drawer opening that allows the tape measure tape to be fed out and retracted out of the case body, and a pair of upper and lower guide rollers that are provided in the vicinity of the drawer opening and that sandwich the tape measure tape. It consists of a disc-shaped support part that is rotatably supported by the case body, and a cylindrical part formed around the periphery of this support part, and a hollow part formed by the support part and the cylindrical part. A drive motor having a drive gear attached thereto is disposed, a first gear meshing with the drive gear is provided along the entire circumference of one side of the support part, and a first gear is provided along one side edge of the cylindrical part. A second gear is formed on the outer periphery of the side, and a second intermediate gear is attached to the rotating shaft of the one guide roller, and the second intermediate gear and the second gear are connected to each other via the first intermediate gear. An automatic tape measure characterized in that it is configured to interlock.

(Function) When the operation switch is operated from the OFF state to the ON state, the rotation of the drive gear attached to the drive motor is transmitted to the first gear, and the winding drum rotates in one direction. The rotation of gears is the first
is transmitted to the second intermediate gear via the intermediate gear, and the second
One guide roller to which the intermediate gear is attached rotates in one direction. As a result, the measuring tape held between one guide roller and the other guide roller moves in one direction, and is drawn out from or drawn into the case body.

(Example) An example of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, the automatic tape measure 1 is
A winding drum 3 around which a measuring tape 2 is wound, a rotational drive means 4 for rotating the winding drum 3 in forward and reverse directions,
The main component is an operation switch 5 for driving and operating the rotation drive means 4, and these are all housed inside a case body 6 formed by a front case 61 and a back case 62. 93... are screws for fixing the front case 61 and the back case 62.

The winding drum 3 includes a disk-shaped support portion 37 rotatably supported by the case body 6, and this support portion 3.
7 and a cylindrical part 35 formed around the periphery of the support part 37, and a drive motor 4 to which a drive gear 47 is attached is disposed in the hollow space formed by the support part 37 and the cylindrical part 35. There is. This winding drum 3 is located approximately at the center inside the case body 6, and is located at the front case 61.
The support part 3 is attached to a support shaft 63 protruding from the inner surface of the support part 3.
7 is rotatably supported. Flange-shaped winding guide plates 32 and 33 are provided on both sides of the outer circumferential surface 31 of the cylindrical portion 35, respectively, and over the entire circumference of the side surface of the support portion 37 on the back case 62 side.
A first gear 48 is shaped to mesh with the drive gear 47. Further, on the outer circumferential surface 31 of the cylindrical portion 35 that protrudes toward the back case side 62 from the winding guide plate 32,
A second gear 8 that meshes with a first intermediate gear 81 that will be described later.
3 is formed.

The drive motor 41 is fixed as shown in FIG.
After fitting the fixing members 45 and 46 to the drive shaft support parts 43 and 44 of the drive motor 41, the leg pieces of the fixing members 45 and 46 are inserted into the fixing hole 6 of the back case 62.
4,65. In addition,
The direction in which the drive motor 41 is fixed, that is, the direction of the drive shaft 42, is not limited to the illustrated example, as long as it is a direction that facilitates wiring with the operating switch 5 and the battery 10, which will be described later.

The drive motor 41, the drive gear 47, and the first gear 48 constitute the rotation drive means 4.

The tape measure tape 2 is wound with its base end (not shown) fixed to the outer circumferential surface 31 of the winding drum 3, while its tip end 21 is attached to the outlet 6 of the case body 6.
9 to the outside, and this tip 21 has an L
A locking metal fitting 22 in the shape of a letter is attached. A length measurement scale is attached to the surface of the measuring tape 2. Note that the tape measure tape 2 may be made of fiber, steel, or the like.

In the front case 61, regulating rollers 71, 72, and 73 are provided at appropriate positions around the winding drum 3.
These regulating rollers 71, 72, 73 are used to regulate this force and prevent the tape measure tape 2 from spreading when it is elastic, such as when the tape measure tape 2 is made of steel. This is provided to prevent the second winding portion 23 from expanding.
However, these regulating rollers 71, 72, and 73 are not necessarily necessary. Also, take-up tape 2
When the winding portion 23 of the winding tape 2 expands, the winding tape 2
A stop mechanism is constituted by a first intermediate gear 81, a second intermediate gear 82, an upper guide roller 91, and a lower guide roller 92 so that the (see figure). The first intermediate gear 81 is meshed with the second intermediate gear 83, and the second intermediate gear 82 is meshed with the first intermediate gear 81 to rotationally drive the upper guide roller 91. The second intermediate gear 82 is attached to the rotation shaft of the upper guide roller 91. The first intermediate gear 81 is pivotally attached to the back case 62, and the second intermediate gear 82 is configured to rotate together with the upper guide roller 91. Further, the lower guide roller 92 is supported so as to be freely rotatable.
The tape measure tape 2 is sandwiched between the windings of the tape measure tape 2 and the upper guide roller 91 to prevent the tape measure tape 2 from accidentally popping out.

An operation switch 5 is attached to the case body 6, and the operation switch 5 controls the drive motor 41.
The forward and reverse rotation operations are performed. That is, the operating switch 5 is in the OFF state when the horizontal position shown in FIG. When it is turned up, it becomes the second ON state and rotates the drive motor 41 in the reverse direction. However, the relationship between the up and down operation of the switch knob 51 and the rotational direction of the drive motor 41 may be reversed. In the figure, 52 is a switch cover made of a rubber-like member that covers the switch knob 51.

10 is a battery, which is located in a battery storage section 66 of the case body 6.
Two bottles are stored in parallel. The battery cover 67 (see FIGS. 4 and 5) is of a sliding type and can be opened by sliding it in the direction P in the figure.

Next, the operation of the automatic tape measure 1 having the above configuration will be explained.

When feeding out the measuring tape 2, lower the switch knob 51 of the operation switch 5 and turn it to the first ON position.
state, the drive motor 41 is rotated in the forward direction, the winding drum 3 is rotated in the forward direction (rotated to the left in FIG. 1), and the first intermediate gear 81, the second intermediate gear 82, the upper guide roller 91, and the lower guide roller 92 are rotated. In conjunction with
It is something to be carried outside.

Also, when pulling in the measuring tape 2, raise the switch knob 51 of the operation switch 5 upwards.
2 ON state, the drive motor 41 is reversely rotated, the winding drum 3 is reversely rotated (clockwise rotation in FIG. 1), and the first intermediate gear 81 and the second intermediate gear 8 are turned on.
2. The measuring tape 2 is drawn into the case body 6 in conjunction with the upper guide roller 91 and the lower guide roller 92.

In this way, by operating the operation switch, the tape measure can be fed out and pulled in with one hand, and the amount of feeding and retraction can be easily adjusted. Therefore, even if you are working in a dangerous place such as a high-rise building and can only use one hand, you can work safely. Also,
Since you can hold a writing utensil such as a pencil in one hand, marking etc. can be done easily.

Although not shown, the driving of the drive motor 41 may be automatically stopped when the measuring tape 2 is completely retracted and the locking fitting 22 comes into contact with the case body 6. .

(Effects of the invention) The automatic tape measure of the invention has a drive motor disposed in the hollow space formed by the support part and the cylindrical part.
Since there is no need to form a storage portion for the drive motor in the case body itself, the case body can be made smaller.
In addition, since the configuration is such that the driving force of the drive motor is transmitted to the guide roller via the drive gear, the first gear, the second gear, the first intermediate gear, and the second intermediate gear,
The driving force of the drive motor is reliably transmitted to the tape measure tape, and the tape measure tape can be reliably fed out and retracted.

[Brief explanation of the drawing]

Each drawing shows an embodiment of the automatic tape measure of the present invention,
Figure 1 is a rear view with the back case removed, Figure 2 is a sectional view taken along the - line in Figure 1, Figure 3 is a sectional view taken along the - line in Figure 1, and Figure 4 is a sectional view taken along the - line in Figure 1. A sectional view taken along the line - in the figure, and FIG. 5 is an overall perspective view. DESCRIPTION OF SYMBOLS 1... Automatic tape measure, 2... Tape measure tape, 3... Winding drum, 4... Rotation drive means, 5... Operation switch.

Claims (1)

[Scope of Claim for Utility Model Registration] A case body, a winding drum for winding up a tape measure tape provided inside the case body, and a winding drum for winding up a tape measure tape provided on the side surface of the case body, and a winding drum for winding up the tape measure tape provided on the side surface of the case body, and In the tape measure, the tape measure includes a retractable outlet and a pair of upper and lower guide rollers that are provided near the outlet and sandwich the tape, the winding drum being rotatably supported by the case body. A drive motor is composed of a disc-shaped support part and a cylindrical part formed around the periphery of the support part, and a drive gear is attached to the hollow space formed by the support part and the cylindrical part. A first gear that meshes with the drive gear is provided over the entire circumference of one side of the support part, and a second gear is provided on the outer circumference of the cylindrical part near one side edge. A second guide roller is formed on the rotating shaft of the one guide roller.
An automatic tape measure characterized in that an intermediate gear is attached, and the second intermediate gear and the second gear mesh with each other via the first intermediate gear.