초록 ▼

The present invention relates to an improved security control barrier for use in controlling ingress and egress to entranceways, exit ways, driveways, and parking spots. The device consists of a telescoping bollard inserted into a casing imbedded below ground and a locking mechanism for securing the

The present invention relates to an improved security control barrier for use in controlling ingress and egress to entranceways, exit ways, driveways, and parking spots. The device consists of a telescoping bollard inserted into a casing imbedded below ground and a locking mechanism for securing the telescoping bollard in the extended and retracted positions. The invention also serves as an effective anti-theft device.

대표청구항 ▼

[ What is claimed:] [1.] A security barrier device for preventing ingress and egress in public thoroughfares, comprising:a foundation casing member which is open on its bottom surface, the casing member adapted to be installed below grade,a bollard member having outer and inner walls and a control h

[ What is claimed:] [1.] A security barrier device for preventing ingress and egress in public thoroughfares, comprising:a foundation casing member which is open on its bottom surface, the casing member adapted to be installed below grade,a bollard member having outer and inner walls and a control head, said bollard member telescopically positioned in relation to the casing member, the bollard member being retractable and extendible with respect to the casing member, anda gas spring member affixed between the casing member and the bollard member, the gas spring member capable of storing energy and adapted to provide lift assistance between the casing member and the bollard member; rein the stored energy of the gas spring member is at equilibrium with the weight of the bollard member, such that retraction and extension of the bollard member with respect to the casing member is independent of temperature variations.