EP0129404A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Fixings including screws and clamp plates
Assignee: ITW Ltd
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Filing: 1984-06-13
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Granted: —
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Expires: 2004-06-13
Abstract
Abstract @ A fixing for fixing a waterproof membrane 6 and an insulation material 4 to a steel sheet 2 consists of a clamp plate 8 and a screw 10. The screw 10 (Figure 2) comprises a head 11, a shank, and a drilling tip 14. The head 11 has a clamping face 12 which tapers towards the shank, and which has external angles 30 in cross section. The shank has, in succession from the head 11 to the drilling tip 14, a first portion 16 which is unthreaded, a second portion 18 which is threaded, and a third portion 22 which is threaded. The diameter of the first portion 16 is approximately the root diameter of the second portion 18, and the crest diameter of the second portion 18 substantially exceeds the crest diameter of the third portion 22. The clamp plate 8 (Figure 4) is formed from sheet metal and has a central hole 24. The periphery of the clamp plate 8 is of elongate symmertrical shape having a minor dimension which is several times the diameter of the hole 24 and a major dimension substantially greater than the minor dimension. The clamp plate is generally flat with a countersink 28 around the hole 24, and with two endless gutter-like deformations 34, 36, the first one 34 adjacentthe periphery, and the second one 36 approximately midway between the hole 24 and the first one 34.
Inventors
- 👤 George David Hewison
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 10:12
CPC Classifications
E; E04; E04D; E04D3/00; E04D3/36; E04D3/3601; E04D3/3603; E04D5/00; E04D5/14; E04D5/141; E04D5/143; E04D5/144; E04D5/145; F; F16; F16B; F16B35/00; F16B35/04; F16B35/06; F16B43/00; F16B5/00; F16B5/02; F16B5/0275; F16B39/00; F16B39/22; F16B39/28; F16B39/282
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
224 words
A fixing comprising a screw (10) including a head (11), a shank (10), and a drilling tip (14), the head having a clamping face (12) which tapers towards the shank, and a clamp plate (8) formed from sheet metal and having a central hole (24) characterised in that the clamping face (12) of the screw includes external angles (30) in cross section, and the shank has, in succession from the head (11) to the drilling tip (14), a first portion (16), which is unthreaded, a second portion (18) which is threaded, and a third portion (22) which is threaded, the diameter of the first portion (16) being substantially equal to the root diameter of the second portion (18), and the crest diameter of the second portion (18) substantially exceeding the crest diameter of the third portion (22); and in that the periphery of the clamp plate (8) has an elongate symmetrical shape with a minor dimension which is several times the diameter of the hole (24) and a major dimension substantially greater than the minor dimension, and in that the clamp plate is generally flat with a countersink (28) around the hole (24), and with two endless gutter-like deformations (34, 36), a first one (34) adjacent the periphery, and a second one (36) approximately midway between the hole (24) and the first one (34).
Claim 2
Dependent Claim
224 words
A fixing comprising a screw (10) including a head (11), a shank (10), and a drilling tip (14), the head having a clamping face (12) which tapers towards the shank, and a clamp plate (8) formed from sheet metal and having a central hole (24) characterised in that the clamping face (12) of the screw includes external angles (30) in cross section, and the shank has, in succession from the head (11) to the drilling tip (14), a first portion (16), which is unthreaded, a second portion (18) which is threaded, and a third portion (22) which is threaded, the diameter of the first portion (16) being substantially equal to the root diameter of the second portion (18), and the crest diameter of the second portion (18) substantially exceeding the crest diameter of the third portion (22); and in that the periphery of the clamp plate (8) has an elongate symmetrical shape with a minor dimension which is several times the diameter of the hole (24) and a major dimension substantially greater than the minor dimension, and in that the clamp plate is generally flat with a countersink (28) around the hole (24), and with two endless gutter-like deformations (34, 36), a first one (34) adjacent the periphery, and a second one (36) approximately midway between the hole (24) and the first one (34).
Claim 3
Dependent Claim
64 words
A fixing according to claim 1, in which the external angles are present on the screw by virtue of the clamping face (12) having a basic frustoconical shape, from which project a plurality of ribs (30) which are elongate in directions from the top of the head (11) to the shank of the screw, and in which the countersink (28) is frustoconical in shape.
Claim 4
Dependent Claim
55 words
A fixing according to claim 1, in which the basic shape of the clamping face (12) of the screw is a truncated pyramid with six angles, and in which the clamp plate has a countersink (28) which is non-circular in shape and is prepared with a shape which complements that of the screw head (11).
Claim 5
Dependent Claim
25 words
A fixing according to any one of the preceding claims, in which the clamp plate (8) includes a cylindrical portion (32) surrounding the hole (24).
Claim 6
Dependent Claim
113 words
A screw comprising a head (11), a shank, a drilling tip (14), the head having a clamping face (12) which tapers towards the shank, characterised in that the clamping face (12) includes external angles (30) in cross section, and the shank has, in succesion from the head (11) to the drilling tip (14), a first portion (16) which is unthreaded, a second portion (18) which is threaded, and a third portion (22) which is threaded, the diameter of the first portion (16) being substantially equal to the root diameter of the second portion (18), and the crest diameter of the second portion (18) substantially exceeding the crest diameter of the third portion (22).
Claim 7
Dependent Claim
113 words
A screw comprising a head (11), a shank, a drilling tip (14), the head having a clamping face (12) which tapers towards the shank, characterised in that the clamping face (12) includes external angles (30) in cross section, and the shank has, in succesion from the head (11) to the drilling tip (14), a first portion (16) which is unthreaded, a second portion (18) which is threaded, and a third portion (22) which is threaded, the diameter of the first portion (16) being substantially equal to the root diameter of the second portion (18), and the crest diameter of the second portion (18) substantially exceeding the crest diameter of the third portion (22).
Claim 8
Dependent Claim
48 words
A screw according to claim 5, in which the external angles are present by virtue of the clamping face (12) having a basic frustoconical shape, from which project a plurality of ribs (30) which are elongate in directions from the top of the head (11) to the shank.
Claim 9
Dependent Claim
23 words
A screw according to claim 5, in which the basic shape of the clamping face (12) is a truncated pyramid with six angles.
Claim 10
Dependent Claim
100 words
A clamp plate (8) formed from sheet metal and having a central hole (24), characterised in that the periphery of the clamp plate has an elongate symmetrical shape with a minor dimension which is several times the diameter of the hole (24) and a major dimension substantially greater than the minor dimension, and in that the clamp plate is generally flat with a countersink (28) around the hole (24), and with two endless gutter-like deformations (34, 36) a first one (34) adjacent the periphery, and a second one (36) approximately midway between the hole (24) and the first one (34).
Claim 11
Dependent Claim
100 words
A clamp plate (8) formed from sheet metal and having a central hole (24), characterised in that the periphery of the clamp plate has an elongate symmetrical shape with a minor dimension which is several times the diameter of the hole (24) and a major dimension substantially greater than the minor dimension, and in that the clamp plate is generally flat with a countersink (28) around the hole (24), and with two endless gutter-like deformations (34, 36) a first one (34) adjacent the periphery, and a second one (36) approximately midway between the hole (24) and the first one (34).
Claim 12
Dependent Claim
15 words
A clamp plate according to claim 8, in which the countersink (28) is.non-circular in shape.
Claim 13
Dependent Claim
24 words
A clamp plate according to claim 8 or 9, in which the clamp plate (8) includes a cylindrical portion (32) surrounding the hole (24).
References Cited (Backward Citations)
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