Enhanced door lock capable of being locked from inner side of doorplate

Information

  • Patent Grant
  • 6691538
  • Patent Number
    6,691,538
  • Date Filed
    Thursday, December 12, 2002
    22 years ago
  • Date Issued
    Tuesday, February 17, 2004
    21 years ago
Abstract
An enhanced door lock is capable of being locked from an inner side of a doorplate. At the outer lock portion, a ring seat and a C ring clamp two sides of the outer plate of the doorplate so as to enhance the structure of the doorplate to prevent the door lock from being pulled out. The inner cover is installed with a positioning hole. One side of a top of the control knob is drilled with a stud receiving groove. A positioning pin is placed in a stud receiving groove. The outer sleeve and the stud of the positioning pin are coupled with the stud receiving groove; then the bead resisting against the spring exactly pushes the positioning groove of the stud to resist against a positioning groove. By this structure, the lock is locked from the inner side of the doorplate.
Description




FIELD OF THE INVENTION




The present invention relates to door locks, and particularly to a enhanced door lock capable of being locked from an inner side of a doorplate.




BACKGROUND OF THE INVENTION




In the prior art, the door lock has an outer lock portion and an inner lock portion. The outer lock portion and inner lock portion are installed at two sides of a doorplate.




Referring to U.S. Pat. No. 5,950,467, a prior art door lock structure is disclosed in the patent. In the prior art, a door lock is installed in the door body of a door and operated to lock/unlock the door. The door lock comprises an external locking unit mounted on an outer face panel of the door body of the door, an internal locking unit mounted on an inner face panel of the door body of the door, and a locking bolt unit driven by the external locking unit to lock/unlock the door body of the door. The external locking unit comprises a casing, an outside knob, and a lock cylinder. The internal locking unit is comprised of a circular base block, a rotary cover mounted on the circular base block, a sliding knob, and a shaft.




The casing of the external locking unit comprises a circular base shell fixedly fastened to the outer face panel of the door body, a circular recess at the center of the circular base shell at one side, which holds the lock cylinder, a circular center hole through the center of the circular recess, two parallel nuts perpendicularly raised from the circular base shell and inserted into the inside of the door body.




The outside knob of the external locking unit is mounted on the circular base shell of the casing of the external locking unit to hold the lock cylinder in the circular recess of the circular base shell.




The lock cylinder of the external locking unit is fixedly fastened to an inner face panel of the door body of the door, comprising a circular center hole in paid circular base block, which receives the shaft and connected to the nuts of the casing of the external locking unit, an annular groove at one side around the circular center hole thereof, and a notch perpendiculary extended from the annular groove.




The rotary cover of the internal locking unit is mounted on the circular base block, comprising a handle, a center hole, which receives one end of the shaft, a through hole axially extended through the handle and intersected with the center hole thereof, a headed sliding rod axially moved in the through hole in the handle and perpendicularly connected to the sliding knob of the internal locking unit, the headed sliding rod having a locating groove on the periphery thereof, an oblong hole, a threaded locating hole, and a spring-supported locating device mounted in the threaded locating hole and engaged into the locating groove at the headed sliding rod to hold the headed sliding rod in position.




The sliding knob of the internal locking unit is coupled to one end of the headed sliding rod outside the rotary cover, having a lock pin connected to one end thereof. The lock pin is extended through the oblong hole on the rotary cover and perpendicularly inserted into the annular groove at the circular base block of the internal locking unit and moved with the sliding knob between a first position wherein the lock pin is engaged into the notch at the circular base block of the internal locking unit to stop the rotary cover from rotary motion relative to the circular base block of the internal locking unit, and a second position wherein the lock pin is disengaged from the notch at the circular base block of the internal locking unit, allowing the rotary cover to be rotated on the circular base block of the internal blocking unit.




However, the prior art has the following defects. At first, too many components are necessary and thus assembly work is complicated and cost is high. Secondary, steer forces are existed are many portions of the structure and thus the support and strength is weak. As a result, the lock structure is weak. Assembly of inner lock is complicated and can not be used to match the current door lock so that the current used lock must be deserted for updating this prior art lock.




SUMMARY OF THE INVENTION




Accordingly, the primary object of the present invention is to provide an enhanced door lock capable of being locked from an inner side of a doorplate. An outer thread is formed on an outer edge of an outer periphery of the ring seat. The outer thread is engageable with an inner thread at an inner edge of the outer lock casing. An interior of outer plate of the doorplate has a C ring coupled to the outer ring seat. An inner side of the ring seat has connecting ears and an inner side of the C ring is installed with connecting ears. The connecting ears of the C ring are configured with respect to the connecting ears of the ring seat. Each connecting ear has a penetrating hole and each connecting ear has a screw hole. The connecting ears of the C ring and connecting ears of the ring seat are locked by screws. Thereby, the ring seat and C ring clamps two sides of the outer plate of the doorplate so as to enhance the structure of the doorplate to prevent the door lock from being pulled out.




Another object of the present invention is to provide an enhanced door lock capable of being locked from an inner side of a doorplate, wherein the inner cover is installed with a positioning hole. One side of a top of the control knob is drilled with a stud receiving groove. An inner wall of the stud receiving groove is formed with a spring receiving groove and an inlet. A spring and a bead are received in the spring receiving groove through the inlet. A positioning pin is placed in the stud receiving groove. The positioning pin has an outer sleeve. One end of the outer sleeve is installed with a stud. An inner side of the stud is formed with two positioning grooves. Thereby, the outer sleeve and the stud of the positioning pin are coupled with the stud receiving groove; then the bead resisting against the spring exactly pushes the positioning groove of the stud to resist against one positioning groove;




wherein, when the control knob rotates to a lock position; the positioning pin will press downwards so that the bead slides to elastically resist against another positioning groove; then, a distal end of the stud is exactly inserted into the positioning hole of the inner cover to lock the control knob. Thereby, the lock is locked at the inner side of the doorplate.











The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.




BRIEF DESCRIPTION OF THE DRAWINGS





FIG. 1

is an assembled perspective view of the present invention.





FIG. 2

is an exploded perspective view of the present invention.





FIG. 3

is an assembled cross sectional view of the present invention.





FIG. 4

is a schematic view showing the inner lock structure of the present invention.





FIG. 5

is a partial schematic cross sectional view showing that the control knob of the present invention is in an unlock state.





FIG. 6

is a partial schematic cross sectional view showing that the control knob of the present invention is in a lock state.











DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS




Referring to

FIGS. 1

to


6


, the door lock of the present invention mainly includes an outer lock portion


10


, an inner lock portion


20


and a lock pull


30


. The door lock of the present invention is locked on a doorplate


40


which is formed by an outer plate


401


and an inner plate


402


.




The outer lock portion


10


is installed at an outer side of a lock hole


41


of a doorplate


40


and is formed by an outer lock casing


11


, a lock center


12


, and a ring seat


13


. The inner lock portion


20


is installed at inner side of the lock hole


41


of the doorplate


40


. The inner lock portion


20


is formed by an inner cover


21


and a control knob


22


. The lock pull


30


is installed at a lateral side of the doorplate


40


. The lock pull


30


serves for pulling the lock center


12


of the outer lock portion


10


and the control knob


22


of the inner lock portion


20


. The inner cover


21


is locked to the inner doorplate


40


and the control knob


22


is axially installed in a center of the inner cover


21


and is connected to the lock center


12


.




The outer lock portion


10


is installed with an enhancing structure and the control knob


22


of the inner lock portion


20


is installed with an inner lock structure. The enhancing structure includes an outer thread


131


on an outer edge of the outer periphery of the ring seat


13


. The outer thread


131


is engageable with an inner thread


111


at an inner edge of the outer lock casing


11


. An interior of outer plate


401


of the doorplate


40


has a C ring


14


coupled to the outer ring seat


13


. The inner side of the ring seat


13


has connecting ears


132


and the inner side of the C ring


14


are installed with connecting ears


141


. The connecting ears


132


are configured with respect to the connecting ears


141


. Each connecting ear


132


has a penetrating hole


133


and each connecting ear


141


has a screw hole


142


. The connecting ears


132


and connecting ears


141


are locked by screws. Thereby, the ring seat


13


and C ring


14


clamp two sides of the outer plate


401


of the doorplate


40


so as to enhance the structure of the doorplate


40


to prevent the door lock from being pulled out.




In the inner lock structure, the inner cover


21


is installed with a positioning hole


211


. One side of a top of the control knob


22


is drilled with a stud receiving groove


221


. An inner wall of the stud receiving groove


221


is formed with a spring receiving groove


222


and an inlet


223


. A spring


224


and a bead


225


are received in the spring receiving groove


222


through the inlet


223


. A positioning pin


23


is placed in the stud receiving groove


221


. The positioning pin


23


has an outer sleeve


231


. One end of the outer sleeve


23


is installed with a stud


232


. An inner side of the stud


232


is formed with two positioning grooves


232


A. Thereby, the outer sleeve


231


and the stud


232


of the positioning pin


23


can be coupled with the outer side and interior of the stud receiving groove


221


. Then the bead


225


resisting against the spring


224


exactly pushes the positioning groove


232


A of the stud


232


to resist against one positioning groove


232


A.




Thereby, when the control knob


22


rotates to a lock position. The positioning pin


23


will press downwards so that the bead


225


slides to elastically resist against another positioning groove


232


A. Then, a distal end of the stud


232


exactly inserts into the positioning hole


211


of the inner cover


21


to lock the control knob


22


. Thereby, the lock is locked at the inner side of the doorplate


40


.




It should be noted that an outer diameter of the C ring


14


is larger than the lock hole


41


of the outer plate


401


of the doorplate


40


. Thereby, a notch of the C ring


14


exactly inserts into an interior of the lock hole


41


so that the assembly work can be performed easily.




The size of the ring seat


13


is approximately equal to that of the C ring


14


. Thereby, the ring seat


13


and C ring


14


can clamp the outer plate


401


by screwing the screw hole


142


and penetrating hole


133


. Furthermore, the outer lock casing


11


has a tapered shape with an inner larger end. The outer lock casing


11


has a round hole


112


for being engaged with the lock center


12


.




An inner edge of the outer lock casing


11


is formed with a reduced ring


113


which is engaged with an


0


ring


15


so that the outer lock casing


11


may rotate idly. Thereby, as the outer lock casing


11


is rotated by force, the inner lock portion


20


will not separate from the long axial stud


121


of the lock center


12


.




The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.



Claims
  • 1. An enhanced door lock capable of being locked from an inner side of a doorplate; the door lock comprising an outer lock portion, an inner lock portion and a lock pull; wherein the door lock is locked on a doorplate and the doorplate is formed by an outer plate and an inner plate;the outer lock portion being installed at an outer side of a lock hole of the outer plate and being formed by an outer lock casing, a lock center, and a ring seat; the inner lock portion being installed at inner side of the lock hole of the inner plate; the inner lock portion being formed by an inner cover and a control knob; the lock pull being installed at a lateral side of the doorplate; the lock pull serving for pulling the lock center of the outer lock portion and the control knob of the inner lock portion; the inner cover being locked to the inner doorplate and the control knob being axially installed in a center of the inner cover and being connected to the lock center; characterized in that: an outer thread is formed on an outer edge of an outer periphery of the ring seat; the outer thread is engageable with an inner thread at an inner edge of the outer lock casing; an interior of the outer plate of the doorplate has a C ring coupled to the outer ring seat; an inner side of the ring seat has connecting ears and an inner side of the C ring are installed with connecting ears; the connecting ears of the C ring are configured with respect to the connecting ears of the ring seat; each connecting ear has a penetrating hole and each connecting ear has a screw hole; the connecting ears of the C ring and connecting ears of the ring seat are locked by screws; thereby, the ring seat and C ring clamp two sides of the outer plate of the doorplate so as to enhance the structure of the doorplate to prevent the door lock from being pulled out; the inner cover is installed with a positioning hole; one side of a top of the control knob is drilled with a stud receiving groove; an inner wall of the stud receiving groove is formed with a spring receiving groove and an inlet; a spring and a bead are received in the spring receiving groove through the inlet, a positioning pin is placed in the stud receiving groove; the positioning pin has an outer sleeve; one end of the outer sleeve is installed with a stud; an inner side of the stud is formed with two positioning grooves; thereby, the outer sleeve and the stud of the positioning pin are coupled with the stud receiving groove; then the bead resisting against the spring exactly pushes the positioning groove of the stud to resist against one positioning groove; wherein, when the control knob rotates to a lock position; the positioning pin will press downwards so that the bead slides to elastically resist against another positioning groove; then, a distal end of the stud exactly inserts into the positioning hole of the inner cover to lock the control knob; thereby, the lock is locked at the inner side of the doorplate.
  • 2. The enhanced door lock capable of being locked from an inner side of a doorplate as claimed in claim 1, wherein an outer diameter of the C ring is larger than a diameter of the lock hole of the outer plate of the doorplate; thereby, a notch of the C ring exactly inserts into an interior of the lock hole so that the assembly work can be performed easily.
  • 3. The enhanced door lock capable of being locked from an inner side of a doorplate as claimed in claim 1, wherein a size of the ring seat is approximately equal to that of the C ring; thereby, the ring seat and C ring clamp the outer plate by screwing the screw hole and penetrating hole.
  • 4. The enhanced door lock capable of being locked from an inner side of a doorplate as claimed in claim 1, wherein the outer lock casing has a tapered shape with a larger end at a side near the door plate; the outer lock casing has a round hole for being engaged with the lock center.
  • 5. The enhanced door lock capable of being locked from an inner side of a doorplate as claimed in claim 1, wherein an inner edge of the outer lock casing is formed with a reduced ring which is engaged with an O ring so that the outer lock casing can rotate idly; thereby, as the outer lock casing is rotated by force, the inner lock portion will not separate from the long axial stud of the lock center.
US Referenced Citations (9)
Number Name Date Kind
283380 Cooper Aug 1883 A
527560 Rumsey Oct 1894 A
831745 Rice Sep 1906 A
3896644 Nagy et al. Jul 1975 A
4575141 Burns Mar 1986 A
5950467 Dong Sep 1999 A
6145358 Wu Nov 2000 A
6164099 Sh Dec 2000 A
6264255 Fortune Jul 2001 B1