EP0309964B1 - Thumb turn latch - Google Patents
Thumb turn latch Download PDFInfo
- Publication number
- EP0309964B1 EP0309964B1 EP19880115811 EP88115811A EP0309964B1 EP 0309964 B1 EP0309964 B1 EP 0309964B1 EP 19880115811 EP19880115811 EP 19880115811 EP 88115811 A EP88115811 A EP 88115811A EP 0309964 B1 EP0309964 B1 EP 0309964B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shank
- latch
- latch body
- retainer
- thumb turn
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45C—PURSES; LUGGAGE; HAND CARRIED BAGS
- A45C13/00—Details; Accessories
- A45C13/10—Arrangement of fasteners
- A45C13/12—Arrangement of fasteners of press-button or turn-button fasteners
- A45C13/126—Arrangement of fasteners of press-button or turn-button fasteners of turn-buttons
Definitions
- the present invention relates to a thumb turn latch designed to be turned by the thumb and finger through an angle of 90 degrees for releasably holding the flap of a bag-like article in a closing position.
- the disclosed latch includes a latch body having a grip head and a cylindrical stem extending centrally from a lower surface of the grip head.
- the grip head has a locking ridge disposed on and extending diametrically across the lower surface.
- the cylindrical shank terminates in an enlarged foot having an upwardly tapering cam surface.
- the latch body is rotatably mounted on a retainer attached to the body of a bag-like article.
- the retainer includes a split sleeve rotatably receiving therein the shank of the latch body, and a crisscross groove formed in an upper surface of the retainer for receiving the locking ridge of the latch body to lock the latch body selectively in a locking and a releasing position which are angularly spaced by 90 degrees.
- the lower end of the split sleeve is held in abutment with the upwardly tapering cam surface of the shank of the latch body. In this instance, due to the camming action of the upwardly tapering cam surface, the latch body is urged downwardly toward the retainer.
- the locking ridge is released from the crisscross groove and slides up onto the upper surface of the retainer, causing the latch body to be moved upwardly.
- the upwardly tapering cam surface of the enlarged foot is forced into the split sleeve of the retainer, whereupon the split sleeve, which is composed of two opposing resilient thin walls, is spreaded by the cam surface. This forcible deformation of the two opposing walls of the split sleeve continues until the locking ridge is received again in the crisscross groove to lock the latch body in the releasing position.
- the known thumb turn latch of the foregoing construction is however disadvantageous in that the split sleeve of the retainer is likely to be damaged or broken due to fatigue caused by repeated bending of the two opposing resilient thin walls of the split sleeve during turning of the latch body.
- the present invention seeks to provide a thumb turn latch which is durable in construction and has a long service life.
- a thumb turn latch satisfying these requirements is characterized in claim 1.
- Figures 1 and 2 show a briefcase 1 having a closure composed of a pair of laterally spaced thumb turn latches 10, 10 embodying the present invention.
- the thumb turn latches 10 are mounted on a body 2 of the briefcase 1 and releasably engageable with a pair of eyelets 4, 4, respectively, attached to a flap 3 of the briefcase 1 to close the briefcase 1.
- Each of the thumb turn latches 10 includes a latch body 11 rotatably mounted on a retainer 12 secured to the body 2 and adapted to be turned by the thumb and finger to move between a releasing position shown in Figure 1 in which the latch body 11 is freely receivable in the corresponding eyelet 4, and a locking position shown in Figure 2 in which the latch body 11 is held in locking engagement with the eyelet 4.
- the locking and releasing positions are angularly spaced apart by an angle of 90 degrees.
- the thumb turn latch body 11 is molded of synthetic resin and includes, as shown in Figures 3 - 5, a grip head 13 adapted to be gripped by user's fingers for turning the latch body 11, and a split cylindrical shank 14 disposed centrally on and extending perpendicularly from a lower surface 13a of the grip head 13.
- the grip head 13 has on its lower surface 13a four locking ridges 15 angularly equidistant from one another and extending radially inwardly from the outer peripheral edge of the grip head 13 toward the central axis of the split cylindrical shank 14.
- the locking ridges 15 have rounded upper edges for camming action described later.
- the number of the locking ridges 15 is not limited to four as in the illustrated embodiment but only one locking ridge may be employed.
- the split cylindrical shank 14 terminates in an enlarged foot 16 of an interrupted circular shape.
- the enlarged foot 16 has a sharp outer edge 17 at an upper side thereof.
- the split cylindrical shank 14 has two longitudinal slits 18 extending perpendicular to one another in crisscross fashion to divide the shank 14 into four identical segments. With the slits 18 thus provided, the split shank 14 is resiliently contractible radially inwardly.
- the retainer 12 is molded of synthetic resin and includes, as shown in Figures 6 and 7, a flat base 20 and a bearing portion 21 disposed centrally on and projecting perpendicularly from an upper surface of the base 20 for movably receiving therein the shank 14 of the latch body 11.
- the retainer 12 as shown in Figure 8, is attached to a fabric C of the briefcase body 2 ( Figure 1) with the fabric C is sandwiched by and between the base 20 and a back plate 30.
- the back plate 30 and the base 20 are joined together by a pair of rivets 31 extending respectively through a pair of countersunk holes 20a, 20a in the base 20 and also through a pair of holes (not designated) in the back plate 30.
- the bearing portion 21 of the retainer 12 has a stepped axial through-hole composed of an upper small-diameter portion 22 and a lower large-diameter portion 23 separated by a flat shoulder 25.
- the large-diameter portion 23 has an upwardly tapering cam surface 24 disposed adjacent to the small-diameter portion 22 and blending into the flat shoulder 25.
- the cam surface 24 has a height substantially equal to or slightly larger than the height of the locking ridges 15.
- the bearing portion 21 has on its upper end surface 21a ( Figure 7) a crisscross guide groove 26 extending radially outwardly from the stepped hole for receiving the locking ridges 15, respectively, of the latch body 11.
- the crisscross guide groove 26 has a shape complementary in contour with the shape of the locking ridge 15.
- the retainer 12 further has an annular groove 27 disposed concentrically outwardly of the stepped through-hole. This groove 27 is povided for purposes of reducing the weight of the retainer 12 and saving the material used.
- the latch body 11 and the retainer 12 are assembled together by forcibly inserting the split shank 14 into the stepped through-hole in the bearing portion 21 from the small-diameter portion 22 thereof until the enlarged foot 16 on the shank 14 is snapped with the large-diameter portion 23 of the stepped through-hole, as shown in Figure 8.
- the upwardly tapering cam surface 24 acts on the upper edge 17 (Figure 3) of the enlarged foot 16 to urge the shank 14 and hence the latch body 11 downwardly, thereby moving the lower surface 13a ( Figure 3) of the grip head 13 toward the upper end surface 21a ( Figure 7) of the bearing portion 21.
- the locking ridges 15 on the grip head 13 are disposed in registry with the guide grooves 26 in the bearing portion 21, the locking ridges 15 will fit into the guide groove 26 by the interaction between the cam surface 24 and the resilient split shank 14, thereby locking the latch body 11 in position against rotation relative to the retainer 12.
- the lower surface 13a of the grip head 13 is held in abutment with the upper end surface 21a of the bearing portion 21.
- the latch body 11 of the thumb turn latch 10 has a split shank 14 snap-fitted in a stepped through-hole in the retainer 12, and the retainer 12 has an upwardly tapering cam surface 24 formed on the stepped through-hole adjacent to a flat shoulder 25 thereof.
- the cam surface 24 acts on an enlarged foot 16 on the split shank 14 when the latch body 11 is moved upwardly away from the retainer 11 as the grip head 13 is turned to move the latch body 11 between a locking position and a releasing position.
- This combination of the radially contractible shank 14 and the cam surface 24 enables it to use a thick and hence durable bearing portion, such as the bearing portion 21 of the illustrated retainer 12.
- the thumb turn latch 10 having such durable retainer 12 has a long service life.
Description
- The present invention relates to a thumb turn latch designed to be turned by the thumb and finger through an angle of 90 degrees for releasably holding the flap of a bag-like article in a closing position.
- A typical example of thumb turn latch of the type described is disclosed in Italian Utility Model Registration No. 201901. The disclosed latch includes a latch body having a grip head and a cylindrical stem extending centrally from a lower surface of the grip head. The grip head has a locking ridge disposed on and extending diametrically across the lower surface. The cylindrical shank terminates in an enlarged foot having an upwardly tapering cam surface. The latch body is rotatably mounted on a retainer attached to the body of a bag-like article. The retainer includes a split sleeve rotatably receiving therein the shank of the latch body, and a crisscross groove formed in an upper surface of the retainer for receiving the locking ridge of the latch body to lock the latch body selectively in a locking and a releasing position which are angularly spaced by 90 degrees. When the latch body is held in the locking position or the releasing position in which the locking ridge is received in the crisscross groove, the lower end of the split sleeve is held in abutment with the upwardly tapering cam surface of the shank of the latch body. In this instance, due to the camming action of the upwardly tapering cam surface, the latch body is urged downwardly toward the retainer. When the grip head is turned to move the latch body from the locking position to the releasing position and vice versa, the locking ridge is released from the crisscross groove and slides up onto the upper surface of the retainer, causing the latch body to be moved upwardly. With this upward movement of the latch body, the upwardly tapering cam surface of the enlarged foot is forced into the split sleeve of the retainer, whereupon the split sleeve, which is composed of two opposing resilient thin walls, is spreaded by the cam surface. This forcible deformation of the two opposing walls of the split sleeve continues until the locking ridge is received again in the crisscross groove to lock the latch body in the releasing position.
- The known thumb turn latch of the foregoing construction is however disadvantageous in that the split sleeve of the retainer is likely to be damaged or broken due to fatigue caused by repeated bending of the two opposing resilient thin walls of the split sleeve during turning of the latch body.
- With the foregoing drawback of the prior art device in view, the present invention seeks to provide a thumb turn latch which is durable in construction and has a long service life.
- A thumb turn latch satisfying these requirements is characterized in claim 1.
- Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of example.
- Figure 1 is a schematic perspective view of a briefcase incorporating a thumb latch according to the present invention;
- Figure 2 is a view similar to Figure 1, showing the briefcase as it is closed by the thumb turn latch;
- Figure 3 is an enlarged front elevational view of a latch body of the thumb turn latch;
- Figure 4 is a side view of Figure 3;
- Figure 5 is a bottom view of Figure 3;
- Figure 6 is an enlarged plan view of a retainer of the thumb turn latch;
- Figure 7 is a cross-sectional view taken along line VII - VII of Figure 6; and
- Figures 8 and 9 are enlarged cross-sectional views illustrative of the operation of the thumb turn latch.
- Figures 1 and 2 show a briefcase 1 having a closure composed of a pair of laterally spaced thumb turn
latches - The
thumb turn latches 10 are mounted on abody 2 of the briefcase 1 and releasably engageable with a pair of eyelets 4, 4, respectively, attached to aflap 3 of the briefcase 1 to close the briefcase 1. Each of thethumb turn latches 10 includes alatch body 11 rotatably mounted on aretainer 12 secured to thebody 2 and adapted to be turned by the thumb and finger to move between a releasing position shown in Figure 1 in which thelatch body 11 is freely receivable in the corresponding eyelet 4, and a locking position shown in Figure 2 in which thelatch body 11 is held in locking engagement with the eyelet 4. The locking and releasing positions are angularly spaced apart by an angle of 90 degrees. - The thumb turn
latch body 11 is molded of synthetic resin and includes, as shown in Figures 3 - 5, agrip head 13 adapted to be gripped by user's fingers for turning thelatch body 11, and a splitcylindrical shank 14 disposed centrally on and extending perpendicularly from alower surface 13a of thegrip head 13. - The
grip head 13 has on itslower surface 13a fourlocking ridges 15 angularly equidistant from one another and extending radially inwardly from the outer peripheral edge of thegrip head 13 toward the central axis of the splitcylindrical shank 14. Thelocking ridges 15 have rounded upper edges for camming action described later. The number of thelocking ridges 15 is not limited to four as in the illustrated embodiment but only one locking ridge may be employed. The splitcylindrical shank 14 terminates in an enlargedfoot 16 of an interrupted circular shape. The enlargedfoot 16 has a sharpouter edge 17 at an upper side thereof. The splitcylindrical shank 14 has twolongitudinal slits 18 extending perpendicular to one another in crisscross fashion to divide theshank 14 into four identical segments. With theslits 18 thus provided, thesplit shank 14 is resiliently contractible radially inwardly. - The
retainer 12 is molded of synthetic resin and includes, as shown in Figures 6 and 7, aflat base 20 and abearing portion 21 disposed centrally on and projecting perpendicularly from an upper surface of thebase 20 for movably receiving therein theshank 14 of thelatch body 11. - The
retainer 12, as shown in Figure 8, is attached to a fabric C of the briefcase body 2 (Figure 1) with the fabric C is sandwiched by and between thebase 20 and aback plate 30. Theback plate 30 and thebase 20 are joined together by a pair ofrivets 31 extending respectively through a pair ofcountersunk holes base 20 and also through a pair of holes (not designated) in theback plate 30. - The
bearing portion 21 of theretainer 12 has a stepped axial through-hole composed of an upper small-diameter portion 22 and a lower large-diameter portion 23 separated by aflat shoulder 25. The large-diameter portion 23 has an upwardly taperingcam surface 24 disposed adjacent to the small-diameter portion 22 and blending into theflat shoulder 25. Thecam surface 24 has a height substantially equal to or slightly larger than the height of thelocking ridges 15. Thebearing portion 21 has on itsupper end surface 21a (Figure 7) acrisscross guide groove 26 extending radially outwardly from the stepped hole for receiving thelocking ridges 15, respectively, of thelatch body 11. Thecrisscross guide groove 26 has a shape complementary in contour with the shape of thelocking ridge 15. Theretainer 12 further has anannular groove 27 disposed concentrically outwardly of the stepped through-hole. Thisgroove 27 is povided for purposes of reducing the weight of theretainer 12 and saving the material used. - The
latch body 11 and theretainer 12 are assembled together by forcibly inserting thesplit shank 14 into the stepped through-hole in thebearing portion 21 from the small-diameter portion 22 thereof until the enlargedfoot 16 on theshank 14 is snapped with the large-diameter portion 23 of the stepped through-hole, as shown in Figure 8. In this assembled condition, the upwardly taperingcam surface 24 acts on the upper edge 17 (Figure 3) of the enlargedfoot 16 to urge theshank 14 and hence thelatch body 11 downwardly, thereby moving thelower surface 13a (Figure 3) of thegrip head 13 toward theupper end surface 21a (Figure 7) of thebearing portion 21. In this instance, if thelocking ridges 15 on thegrip head 13 are disposed in registry with theguide grooves 26 in thebearing portion 21, thelocking ridges 15 will fit into theguide groove 26 by the interaction between thecam surface 24 and theresilient split shank 14, thereby locking thelatch body 11 in position against rotation relative to theretainer 12. In this locked position, thelower surface 13a of thegrip head 13 is held in abutment with theupper end surface 21a of thebearing portion 21. - When the
grip head 13 is turned in any direction to move thelatch body 11 from the locked position of Figure 1, thelocking ridges 15 on thegrip head 13 are released from thecorresponding guide grooves 26 and slide onto theupper end surface 21a (Figure 7) of thebearing portion 21, thereby moving thelatch body 11 upwardly away from theretainer 12. With this upward movement of thelatch body 11, the enlargedfoot 16 on theshank 14 is forced to slide upwardly along the upwardly taperingcam surface 24 in the large-diameter portion 23 of the stepped through-hole. During that time, the enlargedfoot 16 of thesplit shank 14 resiliently contracts radially inwardly. The upward movement of thelatch body 11 is limited when the upper sharp outer edge 17 (Figure 1) of the enlargedfoot 16 engages the flat shoulder 25 (Figure 7) of the stepped through-hole in theretainer 12. - As described above, the
latch body 11 of thethumb turn latch 10 has asplit shank 14 snap-fitted in a stepped through-hole in theretainer 12, and theretainer 12 has an upwardly taperingcam surface 24 formed on the stepped through-hole adjacent to aflat shoulder 25 thereof. Thecam surface 24 acts on an enlargedfoot 16 on thesplit shank 14 when thelatch body 11 is moved upwardly away from theretainer 11 as thegrip head 13 is turned to move thelatch body 11 between a locking position and a releasing position. This combination of the radiallycontractible shank 14 and thecam surface 24 enables it to use a thick and hence durable bearing portion, such as thebearing portion 21 of the illustratedretainer 12. The thumb turnlatch 10 having suchdurable retainer 12 has a long service life.
Claims (5)
- A thumb turn latch (10) comprising: a latch body (11) having a grip head (13) and a shank (14) extending perpendicularly from a lower surface (13a) of said grip head (13) and terminating in an enlarged foot (16), said grip head (13) having on said lower surface (13a) at least one locking ridge (15) extending radially relative to a central axis of said shank (14); and a retainer (12) movably holding thereon said latch body (11) and including a bearing portion (21), said bearing portion (21) having a hole slidably receiving therein said shank (14) of said latch body (11), said bearing portion (21) further having in an upper surface (21a) thereof a crisscross guide groove (26) extending radially outwardly from said hole (22,23) for receiving therein said locking ridge (15) to lock said latch body (11) in position against rotation relative to said retainer (12), said latch body (11) and said retainer (12) being molded of synthetic resin, said shank (14) of said latch body (11) and said hole (22,23) of said bearing portion (21) including cam means (17,24) engageable with each other to urge said latch body (11) downwardly toward said retainer (12), characterized in that said shank (14) of said latch body (11) has two longitudinal slits (18) extending perpendicular to one another in criss-cross fashion to divide said shank into four substantially identical segments, and that said hole provided in said bearing portion (21) includes a small-diameter portion (22) extending downwardly from said upper surface (21a) of said bearing portion (21) and a large-diameter portion (23) contiguous to said small-diameter portion (22) and receiving therein said enlarged foot (16) of said split shank (14), said large-diameter portion (23) having an upwardly tapering cam surface (24) disposed adjacent to said small-diameter portion (22) and engageable with said enlarged foot (16).
- A thumb turn latch (10) according to claim 1, the number of said locking ridge (15) being four, said four locking ridges (15) being angularly equidistant from one another.
- A thumb turn latch (10) according to one of the preceding claims, said enlarged foot (16) on said split shank (14) having an upper sharp outer edge (17), said stepped hole (22,23) including a flat shoulder (25) separating said small-diameter portion (22) and said large-diameter portion (23) and lockingly engageable with said outer edge (17) of said enlarged foot (16).
- A thumb turn latch (10) according to one of the preceding claims, said cam surface (24) having a height slightly larger than the height of said locking ridge (15).
- A thumb turn latch (10) according to one of the preceding claims, said locking ridge (15) having a rounded upper edge, said criss-cross guide groove (26) having a shape complementary in contour with the shape of said locking ridge (15).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP150920/87 | 1987-10-01 | ||
JP15092087U JPH054530Y2 (en) | 1987-10-01 | 1987-10-01 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0309964A2 EP0309964A2 (en) | 1989-04-05 |
EP0309964A3 EP0309964A3 (en) | 1989-12-27 |
EP0309964B1 true EP0309964B1 (en) | 1992-12-23 |
Family
ID=15507294
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19880115811 Expired EP0309964B1 (en) | 1987-10-01 | 1988-09-26 | Thumb turn latch |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0309964B1 (en) |
JP (1) | JPH054530Y2 (en) |
AU (1) | AU590166B2 (en) |
BR (1) | BR8805148A (en) |
CA (1) | CA1319345C (en) |
DE (1) | DE3876924T2 (en) |
ES (1) | ES2037171T3 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1050229B1 (en) * | 1999-04-28 | 2002-02-13 | E. Wilhelm GmbH Etuifabrik | Case |
JP3647336B2 (en) * | 1999-10-29 | 2005-05-11 | Ykk株式会社 | Twist stop |
DE102010021858B4 (en) * | 2010-05-28 | 2017-03-02 | Esselte Leitz Gmbh & Co. Kg | records container |
AT513445B1 (en) * | 2012-10-15 | 2014-09-15 | Karl Christian Weller | Closure system for utensils |
WO2014070798A1 (en) * | 2012-10-29 | 2014-05-08 | Forever Young International, Inc. | Temperature changing intracorporeal fluid delivery devices |
DE102016116950A1 (en) * | 2016-09-09 | 2018-03-15 | Selman Cankurt | Quick release closure for a shoe |
CN108393308A (en) * | 2018-03-01 | 2018-08-14 | 孟书芳 | A kind of good battery back film cleaning device of cleaning effect for solar energy manufacture |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2213750B3 (en) * | 1973-01-17 | 1976-07-23 | Poinard Jean Bernard | |
US3909888A (en) * | 1974-05-20 | 1975-10-07 | Samsonite Corp | Turn-button fastener |
-
1987
- 1987-10-01 JP JP15092087U patent/JPH054530Y2/ja not_active Expired - Lifetime
-
1988
- 1988-09-26 ES ES88115811T patent/ES2037171T3/en not_active Expired - Lifetime
- 1988-09-26 DE DE19883876924 patent/DE3876924T2/en not_active Expired - Fee Related
- 1988-09-26 EP EP19880115811 patent/EP0309964B1/en not_active Expired
- 1988-09-28 AU AU22945/88A patent/AU590166B2/en not_active Ceased
- 1988-09-30 BR BR8805148A patent/BR8805148A/en not_active IP Right Cessation
- 1988-09-30 CA CA000578966A patent/CA1319345C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0309964A3 (en) | 1989-12-27 |
AU590166B2 (en) | 1989-10-26 |
CA1319345C (en) | 1993-06-22 |
DE3876924T2 (en) | 1993-07-08 |
EP0309964A2 (en) | 1989-04-05 |
JPS6457276U (en) | 1989-04-10 |
JPH054530Y2 (en) | 1993-02-04 |
AU2294588A (en) | 1989-04-06 |
BR8805148A (en) | 1989-05-16 |
ES2037171T3 (en) | 1993-06-16 |
DE3876924D1 (en) | 1993-02-04 |
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