JPS63130938A - Spiral spring - Google Patents

Abstract

PURPOSE:To obtain a desired intensity of spring load (spring constant) at a desired part, by forming a belt-shaped, thin plate into a spiral shape and providing the thin plate with a section-variable part in which the section modulus varies. CONSTITUTION:Section-variable parts 3 and 3 of a thin plate 1 made of steel etc., are formed by removing a part of the plate into a notch-shape between, for example, a point from 140mm and a point from 260mm, respectively from the plate end 2. The shape of this section-variable part 3 may be an inclined notch, a tapering opening, or circular opening, instead of the above shallow, grooved shape, thereby decreasing the section modulus. Or it may be a square projection, thereby increasing the section modulus, on the contrary. As a result, a variable-characteristic spring, in which the load-deflection characteristics or the torque-revolution characteristics can be increased or decreased at a desired position, can be obtained.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a thinly wound spring.

(Prior art) As a spiral spring formed by forming a strip-shaped thin plate into a spiral shape, there are two types of spiral springs: a spring in which the pitch of the spring is in close contact with each other when no load is applied (constant hose spring) as shown in Fig. 13, and a spring as shown in Fig. 15. As shown in Figure 2, non-contact springs are known that have a gap between the pitches of the springs when no load is applied.
It is widely used for extruding products in vending machines, as a balancer for tools, etc., and the latter is widely used as a power source for toys, music boxes, etc.

(Problem to be solved by the invention) Figure 14 shows the constant hose spring load (
or torque) is the vertical axis, and the deflection (or rotation) is the horizontal axis.
Load that shows the relationship between spring load and deflection -
This is a deflection characteristic curve.

As shown in the above curve, when the deflection increases, that is, the spring constant is almost constant for both the characteristics when unwinding the spring (o a b) and the characteristics when unwinding the spring (b c d o).

However, since the thin plates are in close contact, hysteresis occurs due to friction between the plates.

FIG. 16 shows a characteristic curve similar to FIG. 14 for a non-contact type spring.

As shown in the above curve, when the spring is unwound, the load increases significantly with the deflection (o a b c), and when the spring is unwound, there is a large change in load or torque (cdeo
).

In either case, the load increases or decreases monotonically in a smooth curve with deflection, and the load increases or decreases slowly except at the beginning or end of unwinding or unwinding. It is not possible to rapidly increase the load or torque at a desired location, or decrease or increase the load or torque in a desired section.

Therefore, when a conventional constant hose spring or a non-contact type spring is used for pushing out an article, the following problems arise.

For example, as shown in FIG. 17, articles M, M2.

..., Mn using a non-contact type spring, fixing one end of the spring, unwinding the spring, pushing it out, and sequentially taking it out from the discharge port, the weight of the last article to be pushed out M,,M, When the weight of the article is large compared to the weight of the article, the spring load is reduced in this area, so the extrusion force becomes insufficient and extrusion becomes impossible.

Also, when using a constant hose spring to push out and take out multiple items one after another, it is initially necessary to transfer multiple items at the same time, so the spring load is set to be large enough to push out this large number of items. However, if a spring with a large spring constant (load) is used, after the articles are pushed out one after another, an excessive force will be applied to the few remaining articles, which may cause the articles to receive impact and breakage.

In addition, if there is an upward slope or step in the transport path for goods, it is necessary to use a thinly coiled spring with a spring constant (load) large enough to transport the goods in this part of the path. If a spring with a large spring constant is used, excessive force will be applied to the article in other parts of the passage.

Similarly, if the transfer path has a downward slope, excessive force will be applied to the article in this area.

The present invention is a new proposal based on research to solve these problems, and it is possible to set the spring load (or spring constant) to a desired size in any part, which was previously unknown. The purpose is to provide a thinly wound spring.

[Structure of the Invention] (Means for Solving the Problems) The present invention has been made to solve the above-mentioned problems, and in a spiral spring formed by forming a strip-shaped thin plate into a spiral shape, A changing section where the section modulus changed is provided in
A spiral spring characterized in that the load-deflection characteristics of the spring are changed in the relevant portion.

(Function) In the present invention, when the spring constant changes in the portion where the section modulus changes and the weight of the article changes during transport of the article, etc., the load is changed in accordance with the change.

Next, the present invention will be explained in more detail.

In the present invention, a strip-shaped thin plate 1 for forming a spiral spring
There are no particular limitations on the material and shape, and various types can be used.

A changing portion 3 having a changed section modulus is provided at a predetermined portion of the thin plate.

There is no particular limitation on the means for changing the section modulus, and the section modulus can be reduced by reducing the width of the relevant part of the thin plate, or by making a hole, or by increasing the width of the relevant part. It can be made large.

In addition, changing sections with different section modulus are formed at multiple locations,
It is also possible to change the section modulus for each location.

The thin plate is wound a desired number of times and formed into a thinly wound shape. At this time, a gap may be formed to form a non-contact type, or a constant hose spring may be formed in which the thin plates are in close contact with each other.

Next, preferred embodiments of the present invention will be described based on the drawings.

(Example 1) Figure 1 shows a board with a thickness of 0.15 mm, a width of 25.3 mm, and a length of 55 mm.
140 mm ~ 2 from one end 2 of 0 mm thin steel plate l
The changing portions 3, 3 between 60 mm are cut out and formed,
By reducing the width to 15mm, this change part 3.
3 with a smaller section modulus.

Figure 2 is a characteristic curve showing the relationship between deflection and load of a constant hose spring (thinly wound spring) 4 (see Figure 3), which is made by winding such a thin plate l in a spiral shape with an outer diameter of 15°11. The curve ■ shown by is the characteristic when unwinding, and the curve ■ is the characteristic when unwinding, and the load suddenly decreases in the changing part where the section modulus changes.

Curves I' and II' shown by solid lines have a constant width (25,: 1 m
This is a characteristic curve at the time of unwinding and unwinding of a thinly wound spring having the same specifications as the above-mentioned example, and the load is approximately constant. FIG. 3 is a front view showing the measurement method for determining the characteristic curve, in which the ineffective portion 7 provided at one end 2 of the spring 4 is fixed, the spring meter 96 is engaged with the core bar 5, and the The spring gauge 6 is pulled to measure the relationship between the deflection δ and the load P.

(Embodiment 2) FIG. 4 is a plan view showing the shape of the thin plate used in the second embodiment, in which the changing portion 3 is approximately 3.5 mm long between the end 2 of the effective portion of the thin plate that contacts the ineffective portion 7 and the length δA. It is formed with a rectangular tapered opening, and the section modulus of this portion is changed.

FIG. 5 shows a characteristic curve of the second embodiment, in which the section modulus is small at a portion of .delta.A, and the section modulus gradually increases at this section.

(Embodiment 3) FIG. 6 is a plan view showing the shape of a thin plate used in the third embodiment, in which a notch is inclined at both ends at a point of length δA from one end 2, and changing portions 3 are provided on both sides. By forming the thin plate with a small width and gradually increasing the width, the section modulus of this portion is changed. The characteristic curve is the same as that shown in FIG. 5, so its description is omitted.

(Example 4) FIG. 7 is a plan view showing the shape of a thin plate used in the fourth example, in which a changing portion 3 is formed with circular holes centered at points at distances of δA, δB, and δC, In addition, the section modulus is changed by gradually reducing the size of the opening in the changing portion 3.

FIG. 8 is a characteristic curve of the fourth embodiment, in which the load decreases gently in the changing section 3 where the section modulus is changed, and then increases again gently, and the degree of this decrease and increase is the same as the opening. It gets smaller as the size gets smaller.

(Example 5) FIG. 9 is a plan view showing the shape of the thin plate l used in the fifth example, in which changing parts 3, 3 cut out in a rectangular shape over a range of length δA from one end 2 are formed on both sides. The width of the plate is small and constant on both sides, the continuous length δB is not changed, and the plate width is gradually reduced by providing sloped changing portions 3 on both sides in the range of length δC to the continuing tip. This changes the section modulus.

FIG. 10 shows the characteristic curve of the fifth embodiment, in which the load is small in a portion of length δA, then increases rapidly, and then in a portion of length δC, the load is small.
, the load is decreasing slowly.

(Embodiment 6) FIG. 11 is a plan view showing the shape of the thin plate l used in the sixth embodiment, in which a changing portion 3 protrudes squarely at both ends within a length δB separated by a length δA from one end 2. The section modulus is changed by increasing the plate width.

FIG. 12 is a characteristic curve of the sixth embodiment, in which the load is larger and constant in the portion δB than in other portions, and the load increases or decreases rapidly.

(Effects of the Invention) The spring load can be set to a desired value at any position, and the spring load can always be set to an appropriate value.

Therefore, even if the load changes during transport of the article, the change can be coped with and the article can be transported to the destination without being damaged.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the shape of a thin plate according to the first embodiment of the present invention, FIG. 2 is a characteristic curve of the first embodiment, FIG. 3 is a front view showing a method for measuring the characteristic curve, and FIG. A plan view showing the shape of the thin plate of the second embodiment, FIG. 5 is a characteristic curve of the second embodiment, and FIG.
, 7 are plan views showing the shape of the thin plate of the 3rd and 4th embodiments, FIG. 8 is a characteristic curve of the fourth embodiment, and FIG. 9 is a plan view showing the shape of the thin plate of the fifth embodiment. Fig. 10 is a characteristic curve of the fifth embodiment, Fig. 11 is a plan view showing the shape of the thin plate of the sixth embodiment, Fig. 12 is a characteristic curve of the sixth embodiment, and Fig. 13 is a conventional constant hose spring. Figure 14 is a front view of the spring, Figure 14 is its characteristic curve, Figure 15 is a front view of the non-contact thin coil spring, Figure 16 is its characteristic curve, Figure 17 is a drawing showing how to use the spring, and (A) is a side view. Figure 2 (b) is a front view. In the figure, 1 is a thin plate, 2 is one end of the thin plate, 3 is a portion where the section modulus has changed, 4 is a thinly wound spring, 5 is a metal core, 6 is a spring gauge, and 7 is an ineffective portion. Figure 3 Figure 4 Figure 5 Figure 9 Figure 11 Takashi T Niwami (Enkoro I5) Figure 17 Procedural amendment December 26, 1985 Commissioner of the Patent Office Black 1) Akio Yu Tonko , Indication of the case 1986 Patent Application No. 275303 2 Name of the invention Spiral spring 4 Address of agent (1-11-7 Toranomon, Minato-ku, Tokyo 105)
Spontaneous Amendment No. 6, Subject of Amendment (1) The scope of claims is amended as shown in the attached sheet. (2) Lines 17 to 18 of page 1 of the specification, line 7 of page 2,
Page 3, lines 10-11, page 4, line 1, page 6, line 12
"Constant hose spring" in lines 13 to 13, page 7, line 3, and page 11, line 7 are corrected to "constant force spring." (3) Page 2, line 10 of the specification “Load-deflection characteristic curve”
Insert "or torque-rotation characteristic curve" after. (4) "Spring constant" on page 2, line 14 of the specification is corrected to "load or torque." (5) The last line of page 2 of the specification, "Load with deflection" is corrected to "Load or torque with deflection or rotation." (6) "Load or torque" on page 3, line 1, page 3, line 7, and page 3, line 8 of the specification are corrected to "load or torque," respectively. (7) Specification page 3, line 3, page 3, lines 5 to 6, 3
"or torque" after "load" on page 18, page 7, line 7, page 7, line 12, page 10, line 9, page 10, line 10, page 10, line 12. Insert. (8) Page 4 of the specification, lines 5 and 6 “Spring constant (load)”
is corrected to "load or torque". (9) Change “Spring constant (load)” to “Spring constant (load)” on page 4, line 12 of the specification.
Correct it to ``Load or Torque.'' (10) On page 4, line 13 of the specification, "spring constant" is corrected to "load or torque." (11) The last line of page 4 of the specification “load (or spring constant)” should be changed to “
Correct it to ``Load or Torque.'' (12) Insert "or torque-rotation characteristics of spring" next to "load-deflection characteristics of spring" on page 5, line 8 of the specification. (13) "Spring constant" on page 5, line 13 of the specification is corrected to "load or torque." (14) Insert "or torque change" next to "load change" on page 5, line 15 of the specification. (15) "Deflection and load" on page 7, lines 4 and 5 of the specification
Insert "or rotation and torque" next to "or rotation and torque." 2. Claims In a spiral spring formed by forming a strip-shaped thin plate into a spiral shape, the thin plate is provided with a changing section where the section modulus is changed, and the load-deflection characteristics or the torque-rotation characteristics of the spring are adjusted accordingly. A spiral spring characterized by having different parts.

Claims (1)

[Claims] A spiral spring formed by forming a band-shaped thin plate into a spiral shape, characterized in that the thin plate is provided with a changing section where the section modulus changes, and the load-deflection characteristics of the spring are changed in the section.