EP0193337A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Screw grommet
Assignee: Tucker Fasteners Ltd
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Filing: 1986-02-19
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Granted: —
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Expires: 2006-02-19
Abstract
Abstract A one-piece plastics screw grommet has a hollow shank 3 with a flange 4 at one end and a pre-threaded plug 2 detachable therefrom on rotating a screw to pull the parts together. The outside of the shank 3 is shaped at 9 to retain it in a hole in a support until the screw is tightened, and has diverging end walls 23 which are spread apart by a wedge-shaped configuration of the end wall 22 of the advancing plug 2. The shank 3 and plug 2 may have interlocking configurations 20, 21 to hold them together after tightening the screw. The grommet is convenient to use in fixing parts together where the remote one is thin metal with a hole in it to receive the grommet before placing the other part over it and introducing the screw. In particular, there is little or no tendency for the nut to rotate on turning the screw.
Inventors
- 👤 Kiyoteru Yuta
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 18:03
CPC Classifications
F; F16; F16B; F16B19/00; F16B19/04; F16B19/08; F16B19/10; F16B19/1027; F16B19/1036; F16B19/1045; F16B37/00; F16B37/04; F16B37/06; F16B37/062; F16B37/065; F16B37/067
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
247 words
A screw grommet for use in connecting together two plate members by inserting the grommet into a hole in one of the members and introducing a screw through a hole in the other member and into the grommet, the grommet comprising a body portion (3) and a nut portion (2) moulded as one piece of thermoplastic material, the body portion comprising a hollow shank with a head flange (4) at one end to engage the exposed surface of said one of the members when the grommet is inserted into the hole in it, and the shank having an external surface which provides shoulders (9) to lightly engage the other surface of said one of the members to resist accidental ejection of the grommet from said hole after insertion, and the nut portion being hollow with an internal screw thread (10) to be engaged by that of the screw, the body portion and nut portion being interconnected by thin wall portions (6) which break on said portions being drawn together by advance of the nut portion when a screw introduced thereinto is rotated, confronting complementary ends of the body portion and nut portion being V-shaped with wedge-shaped end walls (22) of the nut portion accommodated in diverging end walls (23) of the body portion whereby, when the nut portion advances, the body portion spreads out in opposite directions to overlie the blind side of the said one of the members and thereby firmly secure the grommet against withdrawal.
Claim 2
Dependent Claim
247 words
A screw grommet for use in connecting together two plate members by inserting the grommet into a hole in one of the members and introducing a screw through a hole in the other member and into the grommet, the grommet comprising a body portion (3) and a nut portion (2) moulded as one piece of thermoplastic material, the body portion comprising a hollow shank with a head flange (4) at one end to engage the exposed surface of said one of the members when the grommet is inserted into the hole in it, and the shank having an external surface which provides shoulders (9) to lightly engage the other surface of said one of the members to resist accidental ejection of the grommet from said hole after insertion, and the nut portion being hollow with an internal screw thread (10) to be engaged by that of the screw, the body portion and nut portion being interconnected by thin wall portions (6) which break on said portions being drawn together by advance of the nut portion when a screw introduced thereinto is rotated, confronting complementary ends of the body portion and nut portion being V-shaped with wedge-shaped end walls (22) of the nut portion accommodated in diverging end walls (23) of the body portion whereby, when the nut portion advances, the body portion spreads out in opposite directions to overlie the blind side of the said one of the members and thereby firmly secure the grommet against withdrawal.
Claim 3
Dependent Claim
30 words
A grommet according to claim 1 further characterised in that longitudinal slits (7) extend along the shank of the body portion (3) from where the diverging end walls (23) meet.
Claim 4
Dependent Claim
36 words
A grommet according to claim 2 further characterised in that it comprises engagement means (20,21) to lock the nut portion (2) in the shank of the body portion (3) as tightening of the screw is completed.
Claim 5
Dependent Claim
35 words
A grommet according to claim 3 further characterised in that said engagement means takes the form of an annular groove (21) in the nut portion and complementary shoulders (20) on the inside of the shank.
Claim 6
Dependent Claim
268 words
A screw grommet for use in connecting together two plate members by inserting the grommet into a hole in one of the members and introducing a screw through a hole in the other member and into the grommet, the grommet comprising a body portion (3) and a nut portion (2) moulded as one piece of thermoplastic material, the body portion comprising a hollow shank with a head flange (4) at one end to engage the exposed surface of said one of the members when the grommet is inserted into the hole in it, and the shank having an external surface which provides shoulders (9) to lightly engage the other surface of said one of the members to resist accidental ejection of the grommet from said hole after insertion, and the nut portion being hollow to be engaged by the screw, the body portion and nut portion being interconnected by thin wall portions (6) which break on said portions being drawn together by advance of the nut portion when a screw introduced thereinto is rotated, confronting complementary ends of the body portion and nut portion being V-shaped with wedge-shaped end walls (22) of the nut portion accommodated in diverging end walls (23) of the body portion whereby, when the nut portion advances, the body portion spreads out in opposite directions to overlie the blind side of the said one of the members and thereby firmly secure the grommet against withdrawal, the grommet also comprising engagement means (20, 21) to lock the plug portion (2) in the shank of the body portion (3) as tightening of the screw is completed.
Claim 7
Dependent Claim
268 words
A screw grommet for use in connecting together two plate members by inserting the grommet into a hole in one of the members and introducing a screw through a hole in the other member and into the grommet, the grommet comprising a body portion (3) and a nut portion (2) moulded as one piece of thermoplastic material, the body portion comprising a hollow shank with a head flange (4) at one end to engage the exposed surface of said one of the members when the grommet is inserted into the hole in it, and the shank having an external surface which provides shoulders (9) to lightly engage the other surface of said one of the members to resist accidental ejection of the grommet from said hole after insertion, and the nut portion being hollow to be engaged by the screw, the body portion and nut portion being interconnected by thin wall portions (6) which break on said portions being drawn together by advance of the nut portion when a screw introduced thereinto is rotated, confronting complementary ends of the body portion and nut portion being V-shaped with wedge-shaped end walls (22) of the nut portion accommodated in diverging end walls (23) of the body portion whereby, when the nut portion advances, the body portion spreads out in opposite directions to overlie the blind side of the said one of the members and thereby firmly secure the grommet against withdrawal, the grommet also comprising engagement means (20, 21) to lock the plug portion (2) in the shank of the body portion (3) as tightening of the screw is completed.
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