Door lock with reinforced fireproof function

Patent metadata

Field	Value
Publication number	US-11753848-B2
Application number	US-202117184759-A
Country	US
Kind code	B2
Filing date	Feb 25, 2021
Priority date	Jan 22, 2021
Publication date	Sep 12, 2023
Grant date	Sep 12, 2023

Abstract

A door lock with a reinforced fireproof effect includes a lock body mounted on a door and inner and outer operating units mounted to two sides of the door, respectively. The lock body includes inner and outer chassis made of ferrous material or stainless steel having a melting point higher than 1300° C. Inner and outer fixing members coupled with the inner and outer chassis are also made of ferrous material or stainless steel. Thus, these components of the door lock are less likely to melt during a fire, reducing the spreading speed of the fire.

First claim

The invention claimed is:

1. A door lock comprising:
an inner chassis made of ferrous material or stainless steel, wherein the inner chassis includes a first groove formed on an outer periphery thereof,
an inner mounting seat coupled to the inner chassis and including a second groove aligned with the first groove along an axis parallel to a longitudinal axis of the inner chassis;
an outer chassis made of ferrous material or stainless steel;
an outer mounting seat coupled to the outer chassis, wherein the outer mounting seat includes an opening aligned with the first and second grooves along the axis parallel to the longitudinal axis of the inner chassis, wherein the outer mounting seat is coupled to the inner mounting seat, wherein the inner and outer mounting seats are configured to be received in a first through-hole of a door, and wherein the inner and outer chassis are respectively at an inner side and an outer side of the door, with the first through-hole of the door extending from the inner side through the outer side of the door;
a retractor movably received between the inner and outer mounting seats, wherein the retractor includes an engaging portion received in the opening, wherein the engaging portion is operatively connected to a latch device;
an inner fixing member made of ferrous material or stainless steel and coupled to the inner chassis, wherein the inner fixing member is configured to be fixed to the inner side of the door;
an outer fixing member made of ferrous material or stainless steel and coupled to the outer chassis, wherein the outer fixing member is configured to be fixed to the outer side of the door and closes the first through-hole;
an inner operating unit coupled to the inner fixing member and including an inner handle operatively connected to the retractor;
an outer operating unit coupled to the outer fixing member and including an outer handle operatively connected to the retractor; and
a cover made of ferrous material or stainless material, wherein the cover is coupled to and abuts a face of the inner fixing member, and wherein the cover includes an insertion portion that closes the first groove,
wherein melting points of the inner chassis, the outer chassis, the inner fixing member, the outer fixing member, and the cover are higher than melting points of remaining components of the door lock,
wherein when the remaining components of the door lock melt under a fire occurred at one of the inner and outer sides of the door, the inner chassis, the outer chassis, the inner fixing member, the outer fixing member, and the cover do not melt, the inner chassis, the outer chassis, the inner fixing member, and the outer fixing member still close the first through-hole of the door, and the insertion portion of the cover closes gaps between the first and second grooves and the first through-hole of the door, impeding spread of flame or smoke caused by the fire from the one of the inner and outer sides of the door to another of the inner and outer sides of the door, thereby slowing down spread of the fire.

2. The door lock as claimed in claim 1 , further comprising:
an outer spindle including an outer driving lug, wherein the outer chassis includes a first outer end face and a first outer axial hole extending from the first outer end face, wherein the outer chassis further includes an outer chamber extending from another end face of the outer chassis to the first outer axial hole, wherein the outer spindle is pivotably received in the first outer axial hole, wherein the outer driving lug is operatively connected to the retractor, wherein the outer mounting seat includes a second outer end face connected to the first outer end face of the outer chassis;
an outer torsion spring received in the outer chamber and configured to bias the outer spindle;
an inner spindle including an inner driving lug, wherein the inner chassis includes a first inner end face and a first inner axial hole extending from the first inner end face, wherein the inner chassis further includes an inner chamber extending from another end face of the inner chassis to the first inner axial hole, wherein the inner spindle is pivotably received in the first inner axial hole, wherein the inner driving lug is operatively connected to the retractor, wherein the inner mounting seat includes a second inner end face connected to the first inner end face of the inner chassis; and
an inner torsion spring received in the inner chamber and configured to bias the inner spindle.

3. The door lock as claimed in claim 2 , further comprising a locking control device received in the inner spindle, wherein the locking control device includes a control arm movable along a longitudinal axis of the inner spindle, wherein the first outer axial hole includes an inner periphery having a limiting groove, wherein the outer mounting seat further includes an outer movement groove extending from the second outer end face along a longitudinal axis of the first outer axial hole, wherein the outer spindle and the control arm are coupled to pivot jointly, wherein when the control arm is in the limiting groove, the outer handle is prevented from pivoting, and wherein when the control arm is in the outer movement groove, the outer handle is permitted to pivot.

4. The door lock as claimed in claim 1 , further comprising two mounting posts, and two bolts, wherein the two mounting posts are connected to the outer fixing member and face the inner fixing member, wherein the two mounting posts are configured to be received in two connecting holes in the door, wherein the two bolts abut the inner fixing member and engage with the two mounting posts.

5. The door lock as claimed in claim 1 , wherein the inner mounting seat and the outer mounting seat are made of a zinc alloy or an aluminum alloy.

Assignees

• I Tek Metal Mfg Co Ltd

Inventors

• Tien Hung-Jen

Classifications

• E05B17/0075 Primary

  Insulating, e.g. for limiting heat transfer; Increasing fire-resistance of locks · CPC title

• E05B55/12

  the bolt being secured by the operation of a hidden parallel member {; Automatic latch bolt deadlocking mechanisms, e.g. using a trigger or a feeler} · CPC title

• E05B63/10

  requiring only two cylindrical holes in the wing · CPC title

• E05B47/0661

  axially, i.e. with an axially engaging blocking element · CPC title

• E05B3/06

  by means arranged in or on the rose {or escutcheon} · CPC title