The present invention relates generally to a fire door lock.
For fire safety, fire doors are commonly installed in stairwells of buildings to prevent spreading of flames and smokes in fires. The fire doors are normally kept in a locked state by a lock, and in emergency, escaping persons may unlock the fire door by directly pushing the door lock from the inside. The door lock can be set in a normally unlocked state by turning a knob. The mode of operation by which turning the knob commonly adopts is that an operator pushes open the fire door with one hand and, simultaneously, carries out an operation of turning the knob with the other hand. This is not ergonomic. The operation is quite effort-consuming. Apparently, further improvement is necessary.
In order to alleviate the above problems, the present invention aims to provide a knob-less horizontal-shift fire door lock.
An objective of the present invention is to provide a knob-less horizontal-shift fire door lock, which comprises a base, which comprises a longitudinal bar, at least one unlocked-state positioning member being arranged in a range of the longitudinal bar, each of the at least one unlocked-state positioning member being provided with at least one positioning section, the at least one positioning section being formed of a horizontal groove and a guide groove that are set in communication with each other as a group, the horizontal groove being parallel to the longitudinal bar, an included angle being formed between the horizontal groove and the guide groove; a latch, which is pivotally mounted, by means of a pivot pin, to a first end of the base, the latch being biased and elastically supported by a spring, such that a part of a free end of the latch is normally biased out of the base; a push board, which is pivotally mounted, at a middle section thereof, in the base by an axle; and a handle bar, which is slidably mounted on the longitudinal bar, the handle bar being at least provided with one guide pin, the guide pin being movable in unison with the handle bar, the guide pin extending through the positioning section, the handle bar being normally biased by at least one elastic element to eject outwards and moving the guide pin to slide into the guide groove, wherein the handle bar is depressible in a direction toward the longitudinal bar and the first end of the handle bar is caused to push and move a second end of the push board such that a first end of the push board is moved to drive the latch to retract inwards into the base to achieve an unlocked state, and the guide pin is caused to slide along the guide groove toward an entry opening of the horizontal groove, wherein the handle bar is horizontally shiftable to cause the guide pin to further slide into the horizontal groove to have the handle bar locked in position and keeping the latch staying in the unlocked state. As such, the knob-less horizontal-shift fire door lock according to the present invention is such that an operator uses the same hand that pushes and depresses down the handle bar to horizontally move and shift the handle bar to set the latch in a locked position. Thus, there is no need to change hand posture in operation, making it extremely ergonomic, and this demonstrates novelty and inventiveness of the present invention.
In the knob-less horizontal-shift fire door lock according to the present invention, the latch comprises a push surface, and the push surface is located on a moving path of the first end of the push board.
In the knob-less horizontal-shift fire door lock according to the present invention, the push board is provided with a roller rotatably mounted to the second end thereof to be in rolling contact engagement with an inner side of the handle bar at the first end thereof.
In the knob-less horizontal-shift fire door lock according to the present invention, the inner side of the handle bar is provided, on a portion thereof in contact engagement with the roller, with a pad for contact engagement with the roller.
In the knob-less horizontal-shift fire door lock according to the present invention, the included angle formed between the horizontal groove and the guide groove is less than or equal to 90 degrees.
In the knob-less horizontal-shift fire door lock according to the present invention, a torsion spring is further included, and the torsion spring is mounted on the unlocked-state positioning member by a locating pin, the torsion spring comprising a first spring segment and a second spring segment, wherein the first spring segment is supported on a fixed object, and the second spring segment elastically supports the guide pin in order to normally bias and push the guide pin outwards so as to also bias and elastically push the handle bar. The second spring segment is formed with a positioning notch, so that when the guide pin slides to a top end of the guide groove, the guide pin falls into the positioning notch.
In the knob-less horizontal-shift fire door lock according to the present invention, at least one return spring is arranged between the longitudinal bar and the handle bar, and the return spring normally biases the handle bar outwards.
In the knob-less horizontal-shift fire door lock according to the present invention, the push board is normally acted upon by a spring so as to drive the second end of the push board to get into contact engagement with an inner side of the first end of the handle bar.
In the knob-less horizontal-shift fire door lock according to the present invention, the base is provided, in the range of the longitudinal bar, with two or more than two unlocked-state positioning members.
An embodiment of the present invention will become apparent from the following description and the attached drawings.
Referring to
In the knob-less horizontal-shift fire door lock disclosed in the present invention, the latch 20 comprises a push surface 23, and the push surface 23 is arranged to locate in a moving path of the first end 30a of the push board 30, so that when the push board 30 rotates about the axle 31, the first end 30a of the push board 30 is in contact engagement with the push surface 23 so as to cause the latch 20 to retract back into the base 10 through rotation about a center defined by the pivot pin 21.
In the knob-less horizontal-shift fire door lock disclosed in the present invention, as shown in
In the knob-less horizontal-shift fire door lock disclosed in the present invention, the push board 30 is integrally formed through stamping or pressing a metal plate, and the present invention is not limited to such. As shown in
As shown in
As shown in
As shown in
As shown in
As shown in
In the knob-less horizontal-shift fire door lock disclosed in the present invention, the latch 20 comprises a push surface 23, and the push surface 23 is located on a moving path of the first end 30a of the push board 30, and a part of a free end of the latch 20 is normally and elastically ejected out of the base 10, such that in a door locked state, the push surface 23 of the latch 20 is in contact engagement with the first end 30a of the push board 30 to make the second end 30b of the push board 30 contacting and supporting the inner side of the handle bar 40. Or, alternatively, the present invention may be structured such that the push board 30 is normally acted upon by a spring (not shown) to bias the second end 30b of the push board 30 to contact and support the inner side of the first end 40a of the handle bar 40. The spring can be torsion spring mounted between the axle 31 and the push board 30, or an extension spring arranged between the push board 30 and a fixed terminal. The present invention is not limited to such.
In the knob-less horizontal-shift fire door lock according to the present invention, as shown in
In the operation of the present invention, in a locked and door-closed condition in which the latch 20 is elastically ejected outward as shown in
In the unlocked state as shown in
In the condition shown in
In the knob-less horizontal-shift fire door lock provided in the present invention, the operator uses the same hand that pushes and depresses down the handle bar 40 to horizontally move and shift the handle bar 40 to set the latch 20 in a locked position. Thus, there is no need to change hand posture in operation, making it extremely ergonomic, and this demonstrates novelty and inventiveness of the present invention.
The structure and shape disclosed in the present invention can be further modified and altered without departing from the spirit and scope of the present invention defined in the following claims. The present invention is not limited to the embodiments described above.
Number | Date | Country | Kind |
---|---|---|---|
110208678 | Jul 2021 | TW | national |