# US 5,345,888 A · Automatic needle threader > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,345,888 A - Document ID: US5345888A - Status: Granted - Kind: A - Application number: 08/152,325 - Filed: 1993-11-15 - Granted: 1994-09-13 - Earliest claimed: 1993-11-15 - Inventors: Samuel R. Frankel - Web page: https://patentgrep.com/patent/US5345888A ## CPC - D05B 87/00: Needle- {or looper-} threading devices - D05D 2207/04: Suction or blowing devices - Y10S 112/03: Pneumatic - D05B: SEWING (appliances for the tailoring trade A41H; sewing tables A47B29/00; sewing in bookbinding B42B2/00; sewing machines modified for knitting D04B39/08) - D05D: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract An automatic needle threader, which uses compressed air to thread the needles of sewing machines, has means for imparting a rotational or swirling motion to the air which smooths out the frayed ends of the thread for easier and more positive threading. The compressed air is directed into an air chamber in which a spiral shaped baffle is mounted to impart the swirling motion. The threader can be permanently mounted on a sewing machine with a hinge connection allowing the threader to be moved out of position when not in use and to be moved into position so that the exiting end of the air chamber is located adjacent and opposite the eye of the needle. Alternatively, the threader may be removably mounted to a sewing machine using straps connected to the hinge. ## Claims ### Claim 1 An automatic needle threader for a sewing machine comprising a housing; an air chamber attached to said housing; a hinge having a first section adapted to be connected to said sewing machine and a second section being pivotally connected, via a horizontally disposed hinge pin, to said first section and being connected to said housing, said air chamber comprising a proximal section having a first and a second end, said first end being attached to said housing; a funnel section having a third and a fourth end, said third end being attached to said second end; and a spout section attached to said fourth end; a means for providing compressed air into said chamber; and a means for imparting a swirling motion to said compressed air. ### Claim 2 (depends on 1) The automatic needle threader of claim 1 wherein said means for imparting a swirling motion to said air comprises a helical baffle mounted within said funnel section. ### Claim 3 (depends on 2) The automatic needle threader of claim 2 wherein said means for providing compressed air into said chamber comprises a solenoid. ### Claim 4 (depends on 3) The automatic needle threader of claim 3 wherein said proximal section comprises a wall having an opening therein and said means for providing compressed air further comprises a piston which is responsive to said solenoid and is propelled forward to said wall when said solenoid is activated. ### Claim 5 (depends on 4) The automatic needle threader of claim 4 wherein said threader further comprises an electrical switch connected to said solenoid and wherein operation of said electrical switch activates said solenoid. ### Claim 6 (depends on 5) The automatic needle threader of claim 5 wherein said spout comprises an upper surface, an access slot cut in said upper surface, and a rotatable jacket attached to said spout. ### Claim 7 (depends on 1) The automatic needle threader of claim 1 wherein said spout comprises an upper surface, an access slot cut in said upper surface, and a rotatable jacket attached to said spout. ### Claim 8 (depends on 7) The automatic needle threader of claim 7 wherein said means for imparting swirling motion to said air comprises a helical baffle mounted within said funnel section. ### Claim 9 (depends on 8) The automatic needle threader of claim 8 wherein said means for providing compressed air into said chamber comprises a solenoid and an electrical switch connected to said solenoid. ### Claim 10 (depends on 9) The automatic needle threader of claim 9 wherein said proximal section comprises a wall having an opening therein and said means for providing compressed air further comprises a piston which is responsive to said solenoid and is propelled forward to said wall when said solenoid is activated. ### Claim 11 (depends on 10) The automatic needle threader of claim 10 wherein said threader comprises an electrical switch connected to said solenoid wherein operation of said electrical switch activates said solenoid thereby impelling said piston forward toward said wall. ### Claim 12 An automatic needle threader comprising a housing; an air chamber attached to said housing; a means for attaching said housing to a sewing machine, said air chamber comprising a proximal section having a first and a second end, said first end attached to said housing; a funnel section having a third and a fourth end, said third end being attached to said second end of said air chamber; a spout section attached to said fourth end; means for smoothing the frayed end of a single thread comprising means for providing compressed air into said chamber; and means for imparting a swirling motion to said compressed air. ### Claim 13 (depends on 12) The automatic needle threader of claim 12 wherein said means for imparting a swirling motion to said air comprises a helical baffle mounted within said funnel section. ### Claim 14 (depends on 13) The automatic needle threader of claim 13 wherein said means for removably attaching said housing to said sewing machine comprises at least one strap and at least one hinge connected to said strap, said at least one hinge having a first and second section, said second section being pivotally connected to said first section, via a horizontally disposed hinge, and being connected to said housing. ### Claim 15 (depends on 14) The automatic needle threader of claim 14 wherein said means for providing compressed air into said chamber comprises a solenoid. ### Claim 16 (depends on 15) The automatic needle threader of claim 15 wherein said proximal section comprises a wall having an opening therein and said means for providing compressed air furhter comprises a piston which is responsive to said solenoid and is propelled forward to said wall when said solenoid is activated. ### Claim 17 (depends on 16) The automatic needle threader of claim 16 wherein said threader further comprises an electrical switch connected to said solenoid wherein operation of said electrical switch activates said solenoid. ### Claim 18 (depends on 17) The automatic needle threader of claim 17 wherein said spout comprises an upper surface, an access slot cut in said upper surface, and a rotatable jacket attached to said spout. ### Claim 19 An automatic needle threader for a sewing machine comprising a housing; an air chamber attached to said housing; means for removably attaching said housing to said sewing machine, said air chamber comprising a proximal section having a first and a second end, said first end attached to said housing; a funnel section having a third and a fourth end, said third end being attached to said second end of said housing; a spout section attached to said fourth end; means for providing compressed air into said chamber; and means for imparting a swirling motion to said compressed air, comprising a helical baffle mounted within said funnel section.