Security device for a foldable chair

• US 5,478,138 A
• Filed: 08/09/1994
• Issued: 12/26/1995
• Est. Priority Date: 08/09/1994
• Status: Expired due to Fees

• Current Assignee: Ali Yu
• Original Assignee: Ali Yu
• Inventors: Yu, Ali
• Primary Examiner(s): Dorner, Kenneth J.
• Assistant Examiner(s): ALLRED, DAVID E
• Application Number:
  US08/287,743
• Time in Patent Office: 504 Days
• Field of Search: 297/56, 297/16.1, 297/334, 297/461, 108/118, 108/120, 108/131, 248/164, 248/432
• US Class Current: 297/461
• CPC Class Codes: A47C 4/14 with cross legs

Abstract

A security device is provided for a foldable chair and includes a control member movably mounted between a pivot member and a vertical section of a base member, an elongated second slot defined in the control member and communicating with a first slot of the pivot member, a linking bar mounted between the two pivot members and having two distal ends each of which has a reduced diameter smaller than that of the linking bar to extend through the first slot of the pivot member and securely engage with a corresponding control member such that the control member is able move with the linking bar synchronously, the linking bar being restricted to slide along the first slot of the pivot member between a first position where the control member aligns with a first end of the pivot member such that the pivot member together with the control member are pivotally engaged with the base member, and a second position where the control member is moved to a position beyond the first end of the pivot member such that the pivot member is fixed to the base member by of the control member.

Claims

1. A security device and a foldable chair which comprises a seat, a pair of substantially L-shaped base members each having a horizontal section fixed to an underside of said seat and a vertical section with a first end and a second end thereof, a first leg portion pivotally engaged with the first end of said vertical section of each of said base members, two pivot members each having a first end pivoted to a mediate portion of each said vertical section of each of said base members and a second end with upward movement limited by means of said horizontal section of each said base member, an elongated first slot defined in a mediate portion of each said pivot member, a second leg portion pivotally engaged with the second end of each said pivot member, said first and second leg portions and being pivotally engaged with each other to allow relative pivotal displacement therebetween, each said security device comprising a control member movably mounted between each said pivot member and each said vertical section of said base member, an elongated second slot defined in each said control member and communicating with said first slots, a linking bar mounted between said two pivot members and having two distal ends each of which has a reduced diameter smaller than that of each said linking bar to extend through said first slot of each said pivot member and securely engage with associated said control member such that said control member is able move with said linking bar synchronously, each said linking bar being restricted to slide along each said first slot of each said pivot member between a first position where said control member aligns with the first end of each said pivot member such that each said pivot member together with said control member is pivotally engaged with said base member and is able to rotate relative to said base member, and a second position where said control member is moved to a position extending beyond the first end of each said pivot member, thereby preventing each said pivot member from rotating relative to said base member such that each said pivot member is fixed to said base member by means of said control member.

2. The security device in accordance with claim 1, further comprising a washer mounted between each said pivot member and each said control member.

3. The security device in accordance with claim 2, further comprising a pivot axle inserted through the first end of each of said pivot members, said washer extended through each of said second slots and connected to said vertical section of said base member, whereby, when said linking bar is at the first position thereof, said pivot members together with said control members are able to rotate synchronously relative to said base members about said pivot axle, and when said linking bar is at the second position thereof, said control members are moved to a position extending beyond the pivot axle, thereby preventing said pivot members from rotating relative to said base member about said pivot axle so as to fix said pivot members to said base members.