JP2005024100A - Synthetic resin-made spring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin-made spring, used as a compression spring used in a liquid extraction pump, and discarding the liquid extraction pump without taking apart in discarding the pump according to type. <P>SOLUTION: Both upper and lower ends of a virtual cylinder are formed of ring-like or plate-like end members 2, 2, and a virtual cylinder wall between the end members is formed by an elastically deformable cylinder forming filament 3 curved or bent non-spirally and a void part 4 surrounded with the the cylinder forming filament and the both end members 2, 2. The cylinder forming filament 3 is formed by arranging two or more rows of meandering columns 12 extended in the vertical direction in zigzag at suitable spaces in the developed state. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a synthetic resin spring, and more particularly to a synthetic resin spring used mainly for a trigger-type or head-pressing type liquid dispensing pump.

  Liquid dispensing pumps are roughly classified into head-pushing and trigger types depending on the operation, but the former head-pushing liquid dispensing pump moves the operating member up and down, and the latter trigger-type liquid dispensing. The delivery pump moves the plunger back and forth by a trigger operation, sucks up the liquid in the container body, pressurizes the liquid, and dispenses it from the nozzle. The vertical movement of the actuating member is performed by repeated operations of “pressing down” and “release” of the head, and the forward and backward movement of the plunger is performed by repeated operations of “pulling” and “release” of the trigger. In the case of a liquid dispensing pump, the "release" operation automatically returns the cylindrical piston below the depressed head and the plunger pushed into the cylinder by the pulled trigger. I have to. For this reason, any type of liquid dispensing pump uses a metal compression spring.

  By the way, recently, in order to effectively use limited resources, when disposing of used products, etc., for example, the materials such as metal, synthetic resin, glass, etc. are separated and discarded, and the collected materials are reused. I have to. However, if the above-described conventional compression spring is made of metal, it cannot be discarded as it is with a head-push-type or trigger-type liquid dispensing pump in which all members other than the compression spring are molded with a synthetic resin material. However, since the compression spring must be taken out from the liquid dispensing pump and disposed of separately, there is a problem that the disposal is troublesome.

A cylindrical and synthetic resin compression spring is also known (Patent Document 1), but a synthetic resin spring is less elastic than a metal spring and has a small expansion / contraction rate compared to the length of the spring. In addition, it is not suitable as a spring for use in the liquid dispensing pump described above.
JP 50-116857 A

  The present invention mainly provides a synthetic resin spring that can be used as a compression spring used in a liquid dispensing pump and can be disposed of without being disassembled when the liquid dispensing pump or the like is disposed of separately. Objective. However, it goes without saying that the synthetic resin spring of the present invention can be used in various other applications.

  As a first means, the upper and lower ends of the virtual cylinder are formed by ring-shaped or flat-plate end members 2, and the deformable cylinder is formed by bending or bending the virtual cylinder wall between the end members in a non-spiral manner. A meandering column formed by the filaments 3 and the gaps 4 surrounded by the cylinder-forming filaments and the both end members 2 and extending in the vertical direction in a serpentine manner when the cylinder-forming filaments 3 are viewed in a developed state. Twelve rows were formed side by side at appropriate intervals.

  As a second means, the bent portions of the meandering columns 12 which have the first means and are adjacent in the circumferential direction are connected by elastic strips 13.

  As a third means, the first or second means is provided and a plurality of the synthetic resin springs 1 are provided, and the plurality of the springs are vertically stacked, and the end member 2 below the upper spring and the end above the lower spring. The member 2 was joined integrally to form one intermediate end member 2a, and the whole was integrally formed.

  The synthetic resin spring according to claim 1 is an elastically deformable tube-forming wire 3 in which a virtual tube wall between the end members 2 and 2 is bent or bent in a non-spiral manner, and these tube-forming wires. Since the both end members 2 and 2 are formed by the gap 4 and the cylindrical forming line 3 is arranged in parallel with a plurality of meandering columns 12 extending in a vertical direction in a meandering manner when viewed in a developed state. When compressed so as to sandwich the end members 2, 2, the tube-forming wire 3 is elastically deformed so as to shrink in the vertical direction, and the distance between the end members 2, 2 is greatly shortened. Since the urging force for returning the end members 2 and 2 to the original position can be obtained by the elastic restoring force of the strip 3, it can be used in place of a metal compression spring such as a liquid dispensing pump.

  Furthermore, since the synthetic resin spring of the present invention is made of a synthetic resin material, rust does not occur even when it is used for a liquid dispensing pump or the like. Furthermore, since the synthetic resin spring of the present invention is made of a synthetic resin material, for example, if it is used in a liquid dispensing pump instead of a metal compression spring, an all synthetic resin liquid dispensing pump is used. Since it can be manufactured, when the liquid dispensing pump is disposed and disposed of separately, it can be disposed as it is without being decomposed, and therefore the disposal can be performed easily.

  According to the second aspect, when the meandering column 12 is originally long, each column is projected outward when the spring is compressed, so that the restoring force of the spring is weakened. However, the elastic strip is extended outwardly from each column. This prevents the spring's elasticity from weakening.

  As described in claim 3, the plurality of springs according to claim 1 or 2 are stacked one above the other, and the end member 2 below the upper spring and the end member 2 above the lower spring are joined together to form one piece. The intermediate end member 2a is integrally formed as a whole, so that the intermediate end member forms a spring node. Especially when the length of the spring is increased, the strength of the entire spring can be increased. The end member has the effect of preventing the meandering column 12 from overhanging when the spring is compressed.

  FIG. 1 shows a synthetic resin spring according to a first embodiment of the present invention. The synthetic resin spring is composed of a pair of end members 2, 2, a tube forming wire 3, and a gap 4, and the pair of end members 2, 2 and the tube forming wire 3 are made of an elastic synthetic resin. It is integrally formed of a material such as polypropylene, polyoxymethylene, or nylon.

  The pair of end members 2 and 2 are ring-shaped or flat-plate-shaped members that form upper and lower ends of the virtual cylinder. In the illustrated example, the planar shape of the end member 2 is a circular ring shape that is the end surface shape of the virtual cylinder shown in FIG. 1C, but a regular N-square ring shape (where N is a natural number of 3 or more). .), For example, a square ring shape or a regular hexagonal ring shape, or a C-shaped ring in which a part of the ring is broken, or a flat plate with a closed opening of the ring may be used. .

  The tube forming line 3 is a non-spiral shape in which a virtual tube wall between the pair of end members 2 and 2 is formed by a gap 4 surrounded by the tube forming line and the both end members 2 and 2. An elastically deformable filament that is bent or bent.

  The embodiment of FIG. 1 is provided with the meandering column 12 shown in FIG. 1 (b) extending in the vertical direction in a meandering manner when the virtual cylindrical wall is viewed in the expanded state when viewed from the virtual cylindrical wall, The meandering column 12 is formed by arranging a plurality of rows in parallel at appropriate intervals. In the illustrated example, the synthetic resin spring 1 is composed of two meandering columns 12 and a pair of end members 2 and 2, and the meandering column 12 and the end members 2 and 2 are connected via a connector. . Each meandering column has the same shape and size.

  When the meandering column 12 becomes longer, each meandering column extends outwardly from the middle part during spring compression, so that the diameter of the meandering column 12 tends to increase. Therefore, as shown in FIG. The tube forming filaments may be connected to each other in the circumferential direction.

  In order to prevent the meandering column 12 from overhanging, a plurality of springs 1 are stacked one above the other, and the end member 2 below the upper spring and the upper end member 2 of the lower spring are joined together to form one intermediate end member The upper and lower springs may be integrally formed as 2a. In FIG. 3, the springs shown in FIG. 2 are stacked one on top of the other, and they are integrally formed. Alternatively, the springs shown in FIG.

FIG. 1A is a perspective view of a spring of the present invention shown in the first embodiment, FIG. 1B is a side view thereof, and FIG. 1C is a plan view thereof. 2a is a first modified perspective view of FIG. 1a, and FIG. 2b is a side view thereof. 3a is a second modified perspective view of FIG. 1a, and FIG. 3b is a side view thereof.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Synthetic resin spring 2 ... End member
2a ... Intermediate end member 3 ... Cylinder-forming wire 4 ... Cavity 12 ... Serpentine column
13 ... Elastic strip

Claims (3)

The upper and lower ends of the virtual cylinder are formed by ring-shaped or flat-plate end members 2, and the elastically deformable tube-forming filament 3 in which the virtual cylinder wall between the end members is bent or bent non-spirally, A plurality of such meandering columns 12 extending in the vertical direction in a meandering manner when the tube-forming wire 3 is formed in a developed state, is formed by a space 4 surrounded by the tube-forming wire and the both end members 2. A synthetic resin spring characterized by being formed side by side at intervals. 2. The synthetic resin spring according to claim 1, wherein the bent portions of the meandering columns adjacent to each other in the circumferential direction are connected by an elastic strip. A plurality of the synthetic resin springs 1 are provided, and the plurality of springs are vertically stacked, and the end member 2 below the upper spring and the end member 2 above the lower spring are joined together to form a single intermediate end member 2a. None, The whole is integrally molded. The synthetic resin spring according to claim 1 or 2.