Helical extension springs

A helical extension spring is a spring which offers resistance to extension. Almost invariably they are made from circular-section wire, and a typical selection is illustrated in Fig. 25.12.

The conventional representations of tension springs are shown in Fig. 25.13 and a schematic drawing for detailing is shown in Fig. 25.14.

Coils of extension springs differ from those of compression springs in so far as they are wound so close together that a force is required to pull them

Helical Coil Drawing
Fig. 25.12

Fig. 25.13 Conventional representation of tension springs

Full eye

Full eye

Extended full hook

Coned end, reduced hook

Coned end, reduced hook

Half eye

Full double eye

Full double eye

Plain end, screw hook

Fig. 25.13 Conventional representation of tension springs

Coned end, extended Square hook swivel hook

Fig. 25.15 Types of end loops

Extended reduced eye

V-hook

V-hook

Coned end, swivel bolt

Full hook

Full hook

Free length

Dia. of wire

Free length

Dia. of wire

Helical Coil Drawing
Fig. 25.14 Schematic drawing of tension spring

Fig. 25.16

apart. A variety of end loops is available for tension springs, and some of the types are illustrated in Fig. 25.15.

A common way of reducing the stress in the end loop is to reduce the moment acting by making the end loop smaller than the body of the spring, as shown in Fig. 25.16.

Free from burrs

Table 25.1 Shows a selection of Belleville washers manufactured to DIN 6796 from spring steel to DIN 17222

Free from burrs

Faucet Hole Pattern

Table 25.1 Shows a selection of Belleville washers manufactured to DIN 6796 from spring steel to DIN 17222

d[ mm H 14

d2 mm h 14

h mm

Test force5

Weight kg/1000

Core diameter

Notation

max.1

min.2

s mm

Force4

2

2.2

5

0.6

0.5

0.4

628

700

0.05

2

2.5

2.7

6

0.72

0.61

0.5

946

1100

0.09

2.5

3

3.2

7

0.85

0.72

0.6

1 320

1 500

0.14

3

3.5

3.7

8

1.06

0.92

0.8

2410

2700

0.25

3.5

4

4.3

9

1.3

1.12

1

3 770

4000

0.38

4

5

5.3

11

1.55

1.35

1.2

5 480

6550

0.69

5

6

6.4

14

2

1.7

1.5

8 590

9 250

1.43

6

7

7.4

17

2.3

2

1.75

11 300

13 600

2.53

7

8

8.4

18

2.6

2.24

2

14900

17 000

3.13

8

10

10.5

23

3.2

2.8

2.5

22100

27100

6.45

10

12

13

29

3.95

3.43

3

34100

39500

12.4

12

14

15

35

4.65

4.04

3.5

46 000

54000

21.6

14

16

17

39

5.25

4.58

4

59 700

75000

30.4

16

18

19

42

5.8

5.08

4.5

74400

90500

38.9

18

20

21

45

6.4

5.6

5

93 200

117000

48.8

20

22

23

49

7.05

6.15

5.5

113 700

145000

63.5

22

24

25

56

7.75

6.77

6

131 000

169000

92.9

24

27

28

60

8.35

7.3

6.5

154000

221 000

113

27

30

31

70

9.2

8

7

172000

269 000

170

30

1 Max. size in delivered condition.

2 Min. size after loading tests to DIN 6796.

3 Permissible range of tolerance of s to DIN 1544 and DIN 1543 respectively for s >6 mm.

4 This force applies to the pressed flat condition and corresponds to twice the calculated value at a

The test force applies for the loading tests to DIN 6796.

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Responses

  • jennifer
    How to draw conventional representation of spring with flat end?
    4 years ago
  • fosco
    How to draw the multiview of tension spring?
    2 years ago
  • marmadoc brandagamba
    How to draw conventional representation of helical compression spring?
    2 years ago
  • Lisa
    How are springs in engineering drawing?
    1 year ago
  • renzo
    How to draw extension spring?
    1 year ago
  • Sarah
    How to draw a helical spring using pencil?
    2 months ago

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