EP0309964B1 - Thumb turn latch - Google Patents

Thumb turn latch Download PDF

Info

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
Application number
EP19880115811
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0309964A3 (en
EP0309964A2 (en
Inventor
Ryukichi Murai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
YKK Corp
Original Assignee
Yoshida Kogyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Yoshida Kogyo KK filed Critical Yoshida Kogyo KK
Publication of EP0309964A2 publication Critical patent/EP0309964A2/en
Publication of EP0309964A3 publication Critical patent/EP0309964A3/en
Application granted granted Critical
Publication of EP0309964B1 publication Critical patent/EP0309964B1/en
Expired legal-status Critical Current

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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.

Landscapes

  • Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
  • Ladders (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Closing And Opening Devices For Wings, And Checks For Wings (AREA)
  • Bag Frames (AREA)
EP19880115811 1987-10-01 1988-09-26 Thumb turn latch Expired EP0309964B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP15092087U JPH054530Y2 (enrdf_load_stackoverflow) 1987-10-01 1987-10-01
JP150920/87 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 (enrdf_load_stackoverflow)
JP (1) JPH054530Y2 (enrdf_load_stackoverflow)
AU (1) AU590166B2 (enrdf_load_stackoverflow)
BR (1) BR8805148A (enrdf_load_stackoverflow)
CA (1) CA1319345C (enrdf_load_stackoverflow)
DE (1) DE3876924T2 (enrdf_load_stackoverflow)
ES (1) ES2037171T3 (enrdf_load_stackoverflow)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1050229B1 (de) * 1999-04-28 2002-02-13 E. Wilhelm GmbH Etuifabrik Etui
JP3647336B2 (ja) * 1999-10-29 2005-05-11 Ｙｋｋ株式会社 捻り掛止具
DE102010021858B4 (de) * 2010-05-28 2017-03-02 Esselte Leitz Gmbh & Co. Kg Schriftgutbehälter
AT513445B1 (de) * 2012-10-15 2014-09-15 Karl Christian Weller Verschlusssystem für Gebrauchsgegenstände
US9849253B2 (en) 2012-10-29 2017-12-26 Forever Young International, Inc. Temperature changing intracorporeal fluid delivery system
DE102016116950A1 (de) * 2016-09-09 2018-03-15 Selman Cankurt Schnellspannverschluss für einen Schuh
CN108393308A (zh) * 2018-03-01 2018-08-14 孟书芳 一种用于太阳能制造的清洁效果好的电池背膜清洁装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2213750B3 (enrdf_load_stackoverflow) * 1973-01-17 1976-07-23 Poinard Jean Bernard
US3909888A (en) * 1974-05-20 1975-10-07 Samsonite Corp Turn-button fastener

Also Published As

Publication number Publication date
ES2037171T3 (es) 1993-06-16
AU2294588A (en) 1989-04-06
DE3876924T2 (de) 1993-07-08
JPH054530Y2 (enrdf_load_stackoverflow) 1993-02-04
DE3876924D1 (de) 1993-02-04
AU590166B2 (en) 1989-10-26
EP0309964A3 (en) 1989-12-27
BR8805148A (pt) 1989-05-16
CA1319345C (en) 1993-06-22
JPS6457276U (enrdf_load_stackoverflow) 1989-04-10
EP0309964A2 (en) 1989-04-05

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