JP3880722B2 - Tape measure brake device - Google Patents

Description

[0001]
[Industrial application fields]
TECHNICAL FIELD The present invention relates to a tape measure braking device having a tape winding urging means incorporated therein, and more particularly, to a tape measure braking device having a mechanism capable of selecting different types of braking for a tape.
[0002]
[Prior art and problems]
2. Description of the Related Art Conventionally, many tape measures equipped with a biasing means such as a coil spring that biases a tape in the winding direction include a braking device that stops the tape at an arbitrary pulling position against the biasing force of the biasing means. .
Among them, a braking device (braking device having a lock mechanism) that holds the pulled-out tape stopped at an arbitrary position by operating a button or lever of the braking operation unit, or a tape only during operation There is a braking device (braking device having an automatic return mechanism) that stops the operation. Furthermore, there are some equipped with the above-mentioned two types of braking devices, and the operator uses them properly according to the use situation.
[0003]
The tape measure equipped with two types of braking devices is installed at different locations where the braking device or the braking operation unit is installed, and one of them stops the tape pulled out until it is unlocked. In many cases, the braking device that is held as it is is provided with a braking operation portion on the front wall of the case, which is a part that can be operated safely and reliably.
In addition, another braking device, which is capable of stopping the tape pulled out only when operating the braking operation unit, is often provided with the braking operation unit on the side surface or the bottom surface of the case.
[0004]
However, the case where the brake operation unit is provided on the side of the case requires two forces: the supporting force for supporting the tape measure body in the hand of the operator and the pressing force of the brake operation unit for stopping the drawn tape. However, it is difficult to adjust the brake when the tape is pulled in frequently. It was.
[0005]
For this reason, the applicant of the present invention has proposed a case where a braking operation portion is provided on the front wall of the case where the braking operation portion of a braking device having a lock mechanism is provided, whereby the support force of the case is stabilized, and Although the operability has also been improved, the braking operation of the tape pushes the braking operation part into the case and stops the tape, so that if the tape is stopped for a long time, the pushing force of the braking operation part is increased. Sometimes weakened and the tape started to move.
[0006]
Also, the braking operation when holding the tape stopped at an arbitrary position (braking device having a lock mechanism) causes the braking operation unit to slide and stops the tape only during the operation (braking device having an automatic return mechanism) ), The braking operation is performed by pushing the braking operation unit, so that the operation of the braking operation unit is not uniform and the operation may be confused.
[0007]
【the purpose】
The present invention has been made in view of the above-described problems, and can reduce the force required to maintain the stopped state, can easily stop the tape even with a small force, and is uniform in the operation of the brake operation unit. An object of the present invention is to provide a braking device having a tape measure.
[0008]
[Means for solving problems]
The gist of the present invention is a tape measure in which a rotating drum that winds a tape around a case is supported in a case, and biasing means for biasing the tape in the winding direction is incorporated in the rotating drum. A brake operation unit that can move up and down is provided on the front wall of the case, and a first brake shoe that comes into contact with the periphery of the rotating drum by raising the brake operation unit, and behind the tape entrance and exit by lowering the brake operation unit A tape measure braking device characterized in that a second brake shoe that contacts the tape is connected to the braking operation section.
[0009]
This tape measure will be described in more detail. A rotating drum that winds the tape around is pivotally supported in the case, and the tape is urged by entraining the tape inside the case as an urging means for urging the tape in the winding direction. The coil spring has a built-in coil spring whose inner end is wound around a shaft provided in the case, and its outer end is connected to the tape so that the coil spring can be pulled out to store energy. It has become.
[0010]
The front wall of the tape measure case configured in this way is provided with a braking operation part of a braking device that can hold the tape while decelerating or stopping it. Braking is performed by appropriately operating the braking operation unit. The first brake shoe connected to the brake operation unit contacts the periphery of the rotating drum to brake the tape, and the second brake shoe connected to the brake operation unit is also attached behind the tape entrance / exit in the case. Press to stop in contact with the tape.
[0011]
The front wall of the case refers to a wall located between the entrance and exit of the tape and the highest portion (vertex portion) of the case, and it is desirable to provide a braking operation portion of the braking device at a suitable position of this portion.
The brake operation unit is formed of a suitable material (resin / metal material, etc.), and the first brake shoe connected thereto is desired from the periphery of the rotary drum by an elastic plate, a spring, or the brake operation unit body. It is better to support it elastically with a gap of.
In addition, the second brake shoe may be maintained using a conventional technique as needed to maintain the distance from the tape or to maintain the stopped state.
[0012]
The braking operation part is composed of a single part, and when the braking operation part is raised, the first brake shoe comes into contact with the peripheral edge of the rotating drum, and when the braking operation part is lowered in the direction of the entrance / exit of the tape. The second brake shoe should be in contact with the tape.
Alternatively, the braking operation portion is composed of a plurality of parts, and the first brake shoe comes into contact with the peripheral edge of the rotating drum by raising the upper member, and the second brake shoe is lowered by lowering the lower member in the tape entrance / exit direction. May be in contact with the tape.
[0013]
The braking mechanism having the first brake shoe is a braking mechanism that stops the tape only during operation, and the braking mechanism that has the second brake shoe is maintained in a state where the tape is held in a stopped state. The mechanism is desirable.
The structure in which the braking operation unit moves up and down and the structure in which the brake shoe is brought into contact with the periphery of the rotating drum are not particularly limited in structure or method, and may be configured by an optimal structure or method.
[0014]
For example, the contact between the brake shoe and the periphery of the rotating drum can be achieved by providing a guide groove on the inner wall of the case for guiding the brake shoe in the disk peripheral direction, or providing a rib on the inner wall of the case for changing the traveling direction of the brake shoe. May be guided in the circumferential direction of the rotating drum.
The operation stroke of the brake operation unit (brake shoe) may be a suitable operation stroke.
[0015]
The peripheral edge of the rotating drum with which the brake shoe is brought into contact does not only indicate the edge of the disk constituting the rotating drum, but also includes a portion close to the edge of the outer peripheral surface from the inner peripheral surface of the disk.
The brake shoes are preferably brought into contact with the discs on both sides of the rotating drum, and the shape and material of the brake shoes are not particularly limited as long as the braking performance is not impaired. For example, it may be a plate shape, or may have a convex shape or a bent shape.
[0016]
The part of the brake shoe to be brought into contact with the peripheral edge of the rotating drum is not particularly limited, and a suitable part may be brought into contact. Preferably, the end part of the brake shoe or the rotating drum of the brake shoe is preferably used. It is good to make the site | part (opposite surface) which opposes a periphery contact.
Further, a groove slightly wider than the disk width may be provided in the contact portion of the brake shoe so that the groove and the disk periphery come into contact with each other, thereby improving the contact stability of the brake shoe.
[0017]
The connection method between the brake shoe and the braking operation unit is not particularly limited, and may be connected by a suitable method.
Further, the first and second brake shoes and the braking operation portion may be formed as an integral part.
[0018]
[Action]
Since the tape measure of the present invention has the above-described structure, when it is desired to temporarily stop the tape or to reduce the pull-in speed, the braking operation portion provided on the case front wall is pulled upward.
By this operation, the first brake shoe connected to the braking operation unit moves rearward, moves in the disk peripheral direction of the rotating drum, and comes into contact with the disk peripheral edge of the rotating drum, thereby braking the tape.
[0019]
In addition, when it is desired to keep the tape in a stopped state, the braking operation portion provided on the front wall of the case is lowered toward the tape entrance / exit. As a result, the second brake shoe connected to the braking operation unit comes into contact with the tape and the tape is braked, and the tape is kept stopped at that position.
At this time, the thumb for braking the tape moves in the front-rear direction, so that a desired braking selection operation can be accurately performed.
Further, even in the operation of a braking device having an automatic return mechanism, the thumb that is braking the tape has an action of pulling the finger in the direction of the base of the thumb, thereby reducing the force burden on the finger. .
[0020]
【Example】
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tape measure brake device according to the present invention will be described with reference to the drawings. FIG. 1 is a side view of the tape measure half case equipped with the brake device according to the present invention. A tape measure 2 of the present invention provided with 21 is a braking device, and includes a braking operation unit 21, a first brake shoe 22, and a second brake shoe 23. The braking operation unit 21 includes a half case 11 and a half case 12 (not shown). Without being able to move forward and backward. The first brake shoe 22 is loosely fitted in a guide groove 15 provided in the case inner wall 14.
[0021]
Reference numeral 3 denotes a rotating drum for winding the tape 6, which is supported by a shaft 17 standing on the inner wall 14 of the half case 11 and the half case 12 (not shown). 31 is a disk periphery, and the end portion 24 of the first brake shoe 22 comes into contact with the operation of the brake operation unit 21 during braking.
4 is a coil spring that urges the tape 6 in the winding direction, 5 is an inlet / outlet through which the tape 6 enters and exits, and 61 is a locking piece of the tape 6. Reference numeral 18 denotes a braking protrusion for maintaining the stopped state of the tape 6 together with the second brake shoe 23 during braking.
[0022]
FIG. 2 is a front view of a tape measure equipped with a braking device according to the present invention. The braking device 2 has a function of stopping the tape 6 only during operation and a function of maintaining the tape 6 in a stopped state. Since the braking operation portion 21 is provided on the case front wall 13 of the tape measure 1, when it is desired to temporarily stop the tape 6 or to reduce the pull-in speed, the braking operation portion 21 on the case front wall 13 is moved upward. Pull.
As a result, the end 24 of the first brake shoe 22 connected to the braking operation section 21 of the braking device 2 contacts the disk peripheral edge 31 of the rotary drum 3 for winding the tape 6 to brake the tape 6. Take it. (See Figure 1)
[0023]
When it is desired to keep the tape 6 in a stopped state, the braking operation portion 21 of the case front wall 13 is lowered toward the entrance / exit 5 of the tape 6.
As a result, the second brake shoe 23 connected to the braking operation portion 21 of the braking device 2 comes into contact with the tape 6 and the tape 6 is braked, and the tape 6 is kept stopped at that position. (See Figure 1)
[0024]
FIG. 3 is a side view of a state in which a half case of a tape measure equipped with a braking device of another embodiment is removed. The braking operation unit 21 of the braking device 2 includes a plurality of members, an upper member 21a and a lower member 21b. Consists of two members.
The upper member 21a is supported by the half case 11 and the half case 12 (not shown) so as to be able to advance and retreat, and the first brake shoe 22 is loosely fitted in the guide groove 15 provided in the case inner wall 14. .
The lower member 21b is also supported by the half case 11 and the half case 12 (not shown) so as to be able to advance and retract.
[0025]
FIG. 4 is a front view of the tape measure of FIG. 3, and the braking operation portion 21 is composed of two members, an upper member 21a and a lower member 21b. When it is desired to reduce the pull-in speed, the upper member 21a of the braking operation portion 21 of the case front wall 13 is pulled upward.
As a result, the end 24 of the first brake shoe 22 connected to the upper member 21 a of the braking operation unit 21 contacts the disk peripheral edge 31 of the rotary drum 3 for winding the tape 6 to brake the tape 6. Take it. (See Figure 3)
[0026]
Further, when it is desired to keep the tape 6 in a stopped state, the lower member 21 b of the braking operation portion 21 of the case front wall 13 is lowered in the direction of the entrance / exit 5 of the tape 6.
As a result, the second brake shoe 23 connected to the lower member 21b of the braking operation unit 21 comes into contact with the tape 6 and the tape 6 is braked, and the tape 6 is kept stopped at that position. (See Figure 3)
[0027]
FIG. 5 is a partially enlarged view showing a contact state of the first brake shoe, and the first brake shoe 22 connected to the brake operation unit 21 is pulled into the case inner wall by pulling the brake operation unit 21 upward of the case. 14 is guided to the guide groove 15 provided in 14 and moves backward.
The disk peripheral edge 31 of the rotating drum 3 and the end 24 of the first brake shoe 22 come into contact with each other, and the tape 6 is braked.
[0028]
FIG. 6 is a partially enlarged view showing a contact state of the first brake shoe with the contact portion facing the periphery of the rotating drum. When the brake operation portion 21 is pulled upward, the brake operation portion 21 and The connected first brake shoe 22 moves backward. Then, the lower surface 25 of the first brake shoe 22 moves toward the disk periphery 31 of the rotary drum 3 by the rib 16 provided on the inner wall 14 of the case, and the disk periphery 31 and the lower surface 25 come into contact with the tape 6. Braking is applied.
[0029]
【effect】
Since the tape measure brake device of the present invention has the above-described structure, it is desired to temporarily stop the tape, to reduce the pull-in speed and adjust the pull-out length, or to keep the tape in the pulled-out state. The operator can operate in the same state without changing the position of the hand holding the tape measure. In addition, the selection of braking can be performed accurately and easily.
[0030]
In addition, even in measurement work with the tape stopped temporarily for a long time, the operating force required for the braking operation has been reduced, so there is no need to feel the force burden on the finger. Safe measurement work can be performed for a long time.
And since the brake operation part of each brake device is shared by one brake operation part, it is advantageous also at the point of reduction of a number of parts, or a manufacturing cost.
[Brief description of the drawings]
FIG. 1 is a side view of a tape measure equipped with a brake device according to the present invention with a half case removed. FIG. 2 is a front view of a tape measure equipped with a brake device according to the present invention. FIG. 4 is a side view of the tape measure with the brake device removed. FIG. 4 is a front view of the tape measure of FIG. 3. FIG. 5 is a partially enlarged view showing the contact state of the first brake shoe. Partial enlarged view showing the contact state of the first brake shoe with the surface facing the periphery of the rotating drum
1- tape measure, 11- half case, 12- half case, 13- front wall, 14- inner wall, 15- guide groove, 16- rib, 17-shaft, 18- braking protrusion, 2- braking device, 21- braking Operation part, 21a-upper member, 21b-lower member, 22-first brake shoe, 23-second brake shoe, 24-end part, 25-lower surface part, 3-rotating drum, 31-disk peripheral edge, 4-coil spring , 5- gateway, 6-tape, 61-locking piece

Claims (5)

In a tape measure that supports a rotating drum that winds the tape around the case, and is equipped with a biasing means that biases the tape in the winding direction. A first brake shoe that is provided with an operation portion and that is brought into contact with the periphery of the rotating drum by raising the brake operation portion, and a second brake shoe that is brought into contact with the tape behind the entrance and exit of the tape by lowering the brake operation portion. Is connected to the brake operation section. 2. The tape measure braking device according to claim 1, wherein an end portion of the first brake shoe is in contact with a peripheral edge of the rotating drum. 2. The brake device for a tape measure according to claim 1, wherein a portion of the first brake shoe facing the periphery of the rotating drum is in contact with the periphery of the rotating drum. The braking operation part is composed of a plurality of members, and by raising the upper member, the first brake shoe comes into contact with the periphery of the rotating drum, and by lowering the lower member in the direction of the entrance / exit of the tape, the second brake shoe becomes the tape. The tape measure brake device according to claim 1, wherein the brake device is in contact with the tape measure. 2. The tape measure brake device according to claim 1, wherein the tape is stopped only when the first brake shoe is operated, and the second brake shoe is held in a stopped state.

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