JP2514967Y2 - Long, small tape measure case - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a tape measure case, and in particular, is devised so as to advantageously realize a compact case that does not have a bulky shape even if a long measure tape is wound therein. It is intended to provide a small, long and elaborate tape measure case.

(Prior Art) Generally, a tape measure case is a method of joining a pair of shell-shaped case halves, each of which has a peripheral wall with a uniform outer contour and an end wall on one side, facing each other. A tape reel wound with a measure tape is rotatably housed in the internal cavity, and this tape reel has a so-called barrel spring for winding the measure tape.

In a conventional tape measure case, the inner end of a barrel spring, that is, a spiral spring that is wound inside the winding body of a tape reel, is locked to a central stem that is integrally formed in one of the shell case halves. By
An example will be described in which spring energy is stored for winding and winding the measure tape.

In this respect, Japanese Patent Laid-Open No. 59-145903 discloses that an upright cylindrical pillar corresponding to the central stem is integrally provided in a casing section corresponding to the half of the shell-like case, and a winding frame can be rotated around the pillar. Although it is disclosed that a hub having a barrel supporting the same is fitted, and in particular, one end of the hub is provided with a flange that fits into the hub seating recess provided in the casing section, to simplify the assembly. In such a double structure of the upright cylindrical column and the hub, the barrel diameter of the hub becomes large, and thus the demand for downsizing of the tape measure case is counteracted by reducing the winding tightening minimum diameter of the spiral spring.

In addition, it has been attempted to reduce the diameter of the stem by insert-molding the central stem into a half-shell case made of metal, but in addition to the disadvantage of increasing the number of man-hours required for insert molding, the material cost and processing cost of the metal stem are also increased. In terms of costs, there are drawbacks that affect the cost.

(Problems to be solved by the invention) Where a shell-like case is generally made of ABS resin or the like, a resin such as polyacetal having higher strength is used only for the material of the central stem. Using this central stem as an independent member from the shell case half,
By assembling this together with the shell case half, it is possible to realize the downsizing of the tape measure case without worrying about the strength due to the small diameter central stem that can make the winding minimum diameter of the spiral spring smaller. Is the purpose of.

(Means for Solving the Problem) The present invention is directed to a pair of shell-shaped case half portions, each of which has a peripheral wall with a uniform outer contour and an end wall on one side, and which are joined to each other so that they are placed inside the shell-shaped case half portions. A tape reel containing a barrel spring that controls winding and unwinding of the measure tape is rotatably housed, and the winding end of the measure tape is passed through the opening provided on the peripheral wall to feed against the barrel spring, and the barrel spring is used for feeding. In the tape measure faced as possible, the shell-shaped case halves each have a boss portion projecting toward the center inner surface and facing each other, and one boss portion is provided with only a non-circular recess opening toward the case inner surface. Has a non-circular head that tightly fits into this recess, and is fitted with a spring-hanging stem that locks the inner end of the barrel barrel spring, and a spring hook that penetrates this boss from the outer surface of the case of the other boss. A snap stopper bush that elastically locks the other end outer circumference with the inner circumference of the boss portion is provided, thereby the spring hooked stem,
A long, small tape measure case characterized in that it is a single small-diameter member independent of each shell-shaped case half.

Now, in FIG. 1, the tape measure by the tape measure case according to the present invention is disassembled, and the main part is turned upside down and the external appearance is illustrated in detail.

In the figure, reference numerals 1 and 2 are a pair of shell-shaped case halves shown by inner and outer surfaces, each of which is made of a molded body such as ABS resin in which a peripheral wall whose outer contour is aligned with one end wall is integrally formed. , Notches 4 and 5 that form an opening at the rounded corner of the peripheral wall of this example to allow the winding end of the measure tape 3 to be fed and can be taken in, and another concave wall near the other rounded corner. 6,7 and string-piercing pins 8,9 that stand upright at their centers are provided.

The measure tape 3 is wound around the outer circumference of the drum of a tape reel 10, and the tape reel 10 is rotatably accommodated in an inner cavity of a tape measure case which is a half of the shell-like case and is joined to face each other. Although not shown in the figure, the tape reel 10 also functions as a so-called barrel spring, which includes a spiral spring partially exposed from the drum of the tape reel 10 and joined to the inner end of the measure tape 3, and 11 is its spring chamber. It is a cover.

A spring-hanging stem that locks the inner end of the spiral spring for storing the power for rewinding the measure tape 3 into the tape measure case, particularly in this invention, is made of ABS resin such as polyacetal resin. It is a single small-diameter member that is independent of the shell-shaped case halves 1 and 2 and is made of a material having higher strength than that of. Shell case half here
It is needless to say that ABS resin is more suitable for 1 and 2 in view of surface properties, processability and cost than high strength.

Therefore, each of the shell-shaped case halves 1 and 2 has a boss portion 12 and 13 which protrudes toward the inner surface of the center and faces each other.

The boss portion 12 of the shell-shaped case half portion 1 is provided with only a non-circular concave portion 14 that opens toward the inner surface.
14 is generally a square hole having V-shaped notches 15 paired on opposite sides thereof. In addition, a screw hole 16 is formed in the bottom of the concave portion 14 and a hook 17 for locking is provided by a screw 17 passing through the screw hole 16.
The tightening of the countersunk hole 19 of the
Shall be fulfilled in accordance with the fixation of.

The spring-loaded stem 20 has a non-circular head portion 21 that fits in the non-circular recess portion 14 of the shell case half 1 at one end, and cuts a slit 22 extending from the other end side to near the under neck of the head portion 21. It consists of a complicated rod. The head portion 21 has a rectangular brim shape corresponding to the above-described shape of the concave portion 14, and ribs 23 are provided opposite to the opposite side surface. Note that the end surface of the head portion 21 has a screw hole 24 for receiving the screw 17, and near the end portion of the spring-loaded stem 20 opposite to the head portion 21, a cut is made from the outer periphery in a direction orthogonal to the slit 22. A pair of notches 25 are provided.

The other half of the shell case 2 has a boss hole 26 in the boss portion 13 thereof.
In this example, a non-circular recess 27 is also laid out in a square shape on the outer surface side of, and a pair of inner escape holes 28 having a depth partially opening at the bottom of the recess 27 with the boss hole 26 interposed therebetween are formed. Mold to have. Reference numeral 29 in the figure denotes a window hole that opens at the bottom of the recess 27.

The other end of the spring hooking stem 20 is supported in the boss hole 26 by a snap stopper bush 30.

The snap stop bush 30 is a square collar that fits in the recess 27.
It is composed of a short cylinder having 31 at one end, and a pair of small projections 32 which snap into and engage with a window hole 29 opening at the bottom of the recess 27 on the opposite side of the square flange 31, and the inside of the short cylinder. Bridge 33 that engages with the slit 22 at the other end of the spring-loaded stem 20 and the spring-loaded stem 20.
It has an inner surface protrusion 34 which engages the notch 25 provided in the base plate, and further has notches 35 and 36 which serve to promote flexibility for these engagements.

In addition to the above areas, the notches 4 and 5 of the shell-shaped case halves 1 and 2 are provided with the impact force of the latch claw 37 attached to the winding end of the measure tape 3 when the spring power is applied. A mouthpiece 39 with a tape guide, which has a cushion spring 38 for relaxation, is attached. In the figure, 40 and 41 are cushion spring receivers.

(Operation) Each of the shell-shaped case half parts according to the present invention has only a boss portion projecting from the center inner surface thereof. As a single small-diameter member separate from the shell-shaped case half part, for the purpose of combination, a non-circular recess is provided in this boss, and a non-circular head formed at one end of the spring-loaded stem in this recess. Is adapted to surely prevent the rotation of the spring-loaded stem that fixes the inner end of the spiral spring so as to store the rewinding spring power of the measuring tape by the barrel spring. The reason why the other end is snap-fastened to the outer surface of the case of the other boss is to easily and firmly support the spring-loaded stem and to appropriately bring out its strength characteristics.

(Example) FIGS. 2 (a) and 2 (b) are an end view and a sectional view of a tape measure using a tape measure case according to the present invention, and FIGS.
Part (b) of the drawings illustrates each specific example in an assembled state, with reference to an end view and a sectional view of a tape measure to which a lock means for fixing the pull-out position of the measure tape is added. Is apparent from the common reference numerals used in the description of FIG. 1, and in FIG. 3, reference numeral 42 designates a slide type locking means.

(Effect of the Invention) This invention is a material for a spring-loaded stem that locks the inner end of the spiral spring so as to store spring power for automatically winding the measure tape, which is usually used in the shell case half. Since it is made of a molded body of a material with a much higher strength than that of the above, it is assembled with the shell-shaped case half part and firmly joined, so that it does not lose the lightness of the tape measure case as a whole and is easy to process. The diameter of the spring-loaded stem can be reduced without any cost disadvantage, and the minimum tightening diameter of the spiral spring can be reduced to meet the demand for a smaller tape measure case. it can.

[Brief description of drawings]

1 is an exploded perspective view of a tape measure according to the present invention, FIG.
FIG. 3 is an end view and a sectional view of another embodiment. 1,2 …… Half of shell case 3 …… Measure tape 10 …… Tape reel 12,13 …… Boss part 14 …… Non-circular recess 20 …… Spring hook 21 …… Non-circular head 30… … Snap stop bush

Claims (1)

(57) [Scope of utility model registration request] 1. A pair of shell-shaped case halves 1 and 2 each having a peripheral wall having a uniform outer contour and an end wall on one side integrally joined to each other so that the shell-shaped case halves 1 and 2 are joined to each other. A tape reel 10 containing a barrel spring for controlling winding and unwinding of the measure tape 3 is rotatably accommodated, and a winding end of the measure tape is passed through the openings 4 and 5 provided on the peripheral wall to feed the barrel tape against the barrel spring. In a tape measure capable of being retracted by a spring, the shell-shaped case halves 1 and 2 each have boss portions 12 and 13 projecting toward the center inner surface and facing each other. Only a non-circular concave portion 14 that opens toward the side is provided, and a non-circular head 21 that fits tightly into this concave portion is provided at one end, and is fitted with a spring hanging stem 20 that locks the inner end of the barrel spring. From the outer surface of the case of the part 13, a spring hook that penetrates the boss part 13 A snap stopper bush 30 is provided which elastically locks the outer circumference of the stem 20 together with the inner circumference of the boss portion 13, thereby allowing the spring-loaded stem 20 to move into the shell-shaped case halves 1,
A long, small tape measure case characterized by a single small diameter member that is separate from 2.