JP2599275Y2 - Tape measure that prevented winding collapse - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention combines a tape measure, especially a cross-shaped two-piece frame having a hand with a drum roll of a measuring tape, and detects the measuring tape over several tens of meters by a rotating handle attached to the winding drum. It is an object of the present invention to propose a development result of a long tape measure that can be easily wound on a winding drum with the aim of expanding the benefits in use.

[0002]

2. Description of the Related Art Japanese Utility Model Publication No. 3-55846 discloses a long tape measure as described above of the type in which a main shaft with a handle and a winding drum are combined and united. In this case, the main shaft with a handle has a disc-shaped portion. And the large-diameter bearing hole and the vertical rod portion and the small-diameter bearing hole of the frame are rotatable. However, there is no mention of the following problems under the light support.

[0003]

While the frame is being conveyed to the position where length measurement is to be performed with the base end of the measuring tape being restrained and fixed during extension for use of this type of tape measure, the scale is not moved. It is necessary to stop the transport movement every time the display is confirmed.

[0004] In order to make the extension of the measuring tape light and easy, the primary purpose of the rotation of the shaft support of the winding drum is to smoothen it. The roll drum was idle due to the inertia of rotation under the transport movement of the frame immediately before that, and there was a glad that the measure tape was broken.

The overhang of the measuring tape loosened by the winding collapse causes the tape to be caught in the gap between the frame and the tape, hinders the rotation of the winding drum, and thus hinders the length measuring procedure.

[0006] It is an object of the present invention to propose a tape measure which can appropriately prevent such winding collapse.

[0007]

According to the present invention, a plurality of concentric ring-shaped seats are provided on one surface of a truncated cone hollow shell, and the inner end of a measuring tape is fixed to the outer peripheral wall of the outer ring seat. The surface has a parallel concave portion extending in the diametrical direction, and the rotating handle is stored and deployed in this parallel concave portion. One side half of a cross-shaped case with a bearing boss that fits into a rotating journal formed with a step smaller in diameter than the wall, and a rotatable support through a bush in which the inner ring seat of the ring-shaped seat is fitted to the inner circumference. In a long tape measure combined with a two-piece frame consisting of a cross-shaped case and the other half on the other side also having a pivot projection, a middle wheel seat is provided between the outer wheel seat and the inner wheel seat of the winding drum. It is made constantly resilient manner sandwiched friction braking members to the end face pressure contact of the wheel seat with the case the other side half portion, a tape measure which prevents the winding collapse characterized by.

Here, the friction braking piece is always elastically sandwiched between the other half of the case via the metal reinforcing ring, and a plurality of fingers which press the friction braking piece against the end face of the middle wheel seat. Is a bush with radial protrusions protruding in the radial direction.
It is hopeful.

FIG. 1 shows a front view of a tape measure according to the present invention, FIG. 2 shows a plan view, and FIG. 3 shows a cross section taken along the line A--A in FIG. 2 is a frame composed of a case half 2a and a case half 2b similar to the case 2; 3 is a measuring tape wound around the drum 1; 4 is a base ring thereof;
Is the butt of the two-piece frame 2.

As shown in FIG. 3, the winding drum 1 comprises a plurality of concentric annular seats 5, an outer race 6, an inner race 7 and a middle race 8 on one side of a truncated cone hollow shell 9, and an outer peripheral wall of the outer race 6. 10
To the inner end of the measuring tape 3. Frustoconical hollow shell 9
On the other surface, there is a parallel concave portion 11 extending in the diametric direction,
The rotation handle 12 is inserted into the parallel recess 11 in FIG.
2 is pivotally supported by a pin 13 so as to be able to turn between a deployed position shown in FIG. Further, the winding drum 1 has a rotating journal 14 formed by adding a step having a smaller diameter than the outer peripheral wall 10 to the outer race seat 6.

One half 2a of the case has a rotating journal 14
The bearing boss 15 fits with the labyrinth rings 16 and 17 and the seal ring 18. The other half part 2b of the case has a pivot projection 20 for rotatably supporting the inner ring seat 7 of the ring seat 5 through a bush 19 fitted to the inner periphery thereof, and 21, 22, and 23 are labyrinth rings. .

In the illustrated example, the bush 19 has a plurality of finger-like projections 24 protruding in the radial direction on the inner surface side of the other half part 2 b of the case (see FIG. 5), which presses against the end face of the middle wheel seat 8. Case other half 2b as friction braking piece 25
The case where the bush 19 is separated from the friction braking piece 25 or the friction braking piece 25 is interposed between the other half 2b of the case and the bush 19 is illustrated. In this case, the design may be changed so as to be always elastically sandwiched via the metal reinforcing ring 26 as shown in FIG.

[0013]

The tape measure according to the present invention is a friction braking piece 2 in which a plurality of finger-like projections 24 are pressed against the middle wheel seat 8 of the winding drum 1.
5 is always elastically sandwiched around the inner surface of the other half 2b of the case and the pivot-shaped projection, so that the frictional resistance
Even if the tape withdrawing speed is excessively fast, the idling of the winding drum accompanying it is advantageously prevented without a significant increase in the withdrawal resistance of the measuring tape, and the collapse of the measuring tape and the adverse effects associated therewith are advantageously achieved. Can be avoided.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS When a person suddenly stops at a speed (about 7 m / s) at a speed (about 7 m / s) of a tape measure having a nominal diameter of 50 m and stops suddenly, when there is no friction braking piece, the measuring tape 3 is wound around three times of the outer winding. According to FIG. 1, in the case where the bush 19 made of the same material as the frame was pressed against the bush 19 using the finger-like projections 24, almost no inertial rotation occurred at the same stop.

This relationship was substantially the same when the friction braking piece 25 having the finger-like projections 24 was formed separately from the bush 19. Further, in each case, when the feeding at a high speed over the entire length of the tape measure having a nominal length of 50 m was repeated several times, frictional heat was generated in the vicinity of the center of the other half part 2b of the case, but according to FIG. Is slightly loosened when inserted as a metal reinforcing ring 26, but the heat generation has virtually disappeared.

[0016]

According to the present invention, when a long tape measure is rapidly fed out and suddenly stopped in the middle of the tape measure, the risk of breakage of the measuring tape around the winding drum can be advantageously reduced by the present invention.

[Brief description of the drawings]

FIG. 1 is a front view of a tape measure.

FIG. 2 is a plan view.

FIG. 3 is a cross-sectional view.

FIG. 4 is a sectional view of another example of a main part.

FIG. 5 is an external view of a bush.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Winding drum 2 Two-piece frame 2a Case half on one side 2b Case half on the other side 3 Measure tape 5 Ring seat 6 Outer seat 7 Inner seat 8 Middle seat 10 Outer peripheral wall 11 Flat recess 12 Rotating handle 13 Pin 14 Rotation Journal 15 Bearing boss 19 Bush 20 Pivot projection 24 Finger projection 25 Friction braking piece

Claims (3)

(57) [Scope of request for utility model registration] A plurality of concentric annular seats (5) are provided on one surface of a truncated cone hollow shell, and an outer peripheral wall (1) of an outer race seat (6) is provided.
0), the inner end of the measuring tape (3) is fixed, while the other surface of the truncated conical hollow shell has a parallel dent (11) extending in the diametrical direction. The winding drum (1) of the measuring tape (3), which is pivotally supported by the pin (13) so as to be able to turn (12) to each of the retracted and deployed positions, has a smaller diameter than the outer peripheral wall (10) on the outer race seat (6). Rotating journal (1)
4) One half of a cross-shaped case (2a) having a bearing boss (15) that fits into (4), and an inner race (7) of a ring-shaped seat (5).
And the other half (2b) of a cross-shaped case having a pivot projection (20) rotatably supported through a bush (19) fitted on the inner periphery thereof. In the combined long tape measure, a middle brake seat (8) is provided between an outer race seat (6) and an inner race seat (7) of the winding drum, and a frictional braking piece pressed against an end face of the middle race seat (8). 25) is always elastically sandwiched between the case and the other half (2b) of the case. 2. The tape measure according to claim 1, wherein the friction braking piece (25) is always elastically sandwiched between the other half (2b) of the case via a metal reinforcing ring. 3. The friction braking piece (25) is a bush (19) in which a plurality of finger-like projections (24) that press against the end face of the middle wheel seat (8) project in the radial direction. Tape measure described in.