FIELD

The present disclosure relates to the field of safety systems and more particularly to a door lock.

BACKGROUND

The background information herein below relates to the present disclosure but is not necessarily prior art.

Conventional door locks employ different types of rim locks to secure residential as well as industrial premises. The conventional rim locks have a puller coupled to a latch bolt as well as a knob is coupled to a dead bolt which project from the housing. The knob is rotated by a person present inside the premise such as a room to unlock the dead bolt followed by operation of the puller to unlock the latch bolt. However, this two-step method to unlock the door completely is not user-friendly. Moreover, the provision of the puller results in a complex construction of the door lock, as the door lock becomes bulky with increased number of parts to be constructed. Additionally, the puller projecting outside the face of the door lock affects the aesthetic appeal of the door lock.

There is therefore felt a need for a door lock, which alleviates the aforementioned drawbacks.

SUMMARY

A door lock including a dead bolt and a latch bolt disposed inside a housing, the door lock comprising a shaft disposed on the slider of the dead bolt, a first link mounted on the shaft proximal to the door outside and configured to displace the latch bolt, a second link mounted on the shaft proximal to the door inside and coupled to the first link, and a knob coupled to the second link. The knob is configured to project on the door inside for turning by a person. The door is configured to be unlocked by displacement of the latch bolt upon turning of the knob by a user from the door inside.

In a preferred embodiment, a first step is configured on the shaft proximal to the door outside. The first step is attached with the first link.

In a preferred embodiment, a second step is configured on the shaft proximal to the door inside. The second step is attached with the second link. In a preferred embodiment the lock is configured to be unlocked by displacing the latch bolt by a key from the door outside as well as by the knob from the door inside.

In a preferred embodiment, the dead bolt and the latch bolt are configured to be displaced by a knob in a horizontal direction along the door width. OBJECTS

Some of the objects of the system of the present disclosure which at least one embodiment herein satisfies are as follows:

An object of the present disclosure is to provide a door lock that eliminates complexity of construction. Another object of the present disclosure is to provide a door lock that can be unlocked solely by a knob from inside of a room and a key from outside.

Yet another object of the present disclosure is to provide a door lock that offers increased safety against theft attempts.

Other objects and advantages of the system of the present disclosure will be more apparent from the following description when read in conjunction with the accompanying figures, which are not intended to limit the scope of the present disclosure.

BRIEF DESCRIPTION OF DRAWING

A door lock, of the present disclosure, will now be described with the help of the accompanying drawing, in which:

Figure 1 shows a front view of a conventional door lock. Figure 2 shows a top view of the figure 1 ;

Figure 3 shows an exploded view of the door lock, in accordance with an embodiment of the present disclosure;

Figure 4 shows an isometric view of the figure 3;

Figure 5 shows a front view of the figure 3 with the latch bolt in a locked configuration; Figure 6 shows a front view of the figure 3 with the latch bolt in an intermediate position;

Figure 7 shows a front view of the figure 3 with the latch bolt in an unlocked position;

Figure 8 shows a sectional view of the figure 5;

Figure 9 shows an isometric view of the dead bolt assembly shown in the figure 3;

Figure 10 shows an isometric view of the first link of the figure 3; Figure 11 shows an isometric view of the shaft of the figure 3; and

Figure 12 shows an isometric view of the second link of the figure 3.

LIST OF REFERENCE NUMERALS

100’- door lock of the prior art

20’- dead bolt assembly of the prior art

60’- latch bolt of the prior art

90’- knob of the prior art

1 ’ - puller of the prior art

100 - door lock of the present disclosure

10 - housing

11 - opening

20 - dead bolt assembly

21 - slider

22 - hole for shaft

23 - dead bolt

30 - first link

31 - aperture

32 - driving lug of first link

33 - limb

40 - shaft

41 - first step

42 - step shaft

43 - second step

50 - second link

51 - aperture

52 - driving lug of second link

60 - latch bolt assembly

61 - bracket 62 - cavity

64 - latch bolt

70 - crank assembly on knob

71 - projection on crank

80 - cover plate

90 - knob

91 - dead lock button

DETAILED DESCRIPTION

Embodiments, of the present disclosure, will now be described with reference to the accompanying drawing.

Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.

The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms "a,” "an," and "the" may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms "comprises," "comprising," “including,” and “having,” are open ended transitional phrases and therefore specify the presence of stated features, elements, modules, units and/or components, but do not forbid the presence or addition of one or more other features, elements, components, and/or groups thereof.

When an element is referred to as being "mounted on," “engaged to,” "connected to," or "coupled to" another element, it may be directly on, engaged, connected or coupled to the other element. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed elements. Terms such as “inner,” “outer,” "beneath," "below," "lower," "above," "upper," and the like, may be used in the present disclosure to describe relationships between different elements as depicted from the figures.

The present disclosure discloses a door lock that eliminates need of a separate puller provided on a conventional door lock to operate the latch bolt assembled in the door lock. The door lock of the present disclosure facilitates operation of the latch bolt as well as the dead bolt from inside the house with a single knob that is turned by the hands of a person. The door lock of the present disclosure eliminates number of parts or components present in a conventional door lock, and simplifies the door lock assembly.

A door lock 100’ of the prior art is shown in the figures 1 and 2. A puller 1’ is configured to be coupled to a latch bolt 60’. A dead bolt assembly 20’ is configured to be coupled to a knob 90’. The door lock 100’ needs a separate puller 1’ to operate the latch bolt 60’ in order to unlock the door lock 100’ from the inside of a room by operation of the knob 90’ by a person.

The door lock 100 of the present disclosure will now be described with reference to the Figure 3 through Figure 12. The embodiment disclosed herein does not limit the scope and ambit of the present disclosure.

As shown in the figures 3-7, the door lock 100 includes a housing 10, a dead bolt assembly 20, a first link 30, a shaft 40, a second link 50, a latch bolt assembly 60, a crank 70, a cover plate 80 and a knob 90. The door lock 100 is configured to be attached to the door of a room. The door inside refers to the inside of the room, while the door outside refers to the outside of the room. The first link 30 is mounted on one end of the shaft 40 while the second link 50 is mounted on the other end of the shaft 40. The first link 30 is mounted proximal to the door outside while the second link 50 is mounted proximal to the door inside.

Referring to Figures 3 to 7, the housing 10 includes openings 11. One of the openings 11 receives a latch bolt 64 of the latch bolt assembly 60 and the other opening 11 receives a dead bolt 23 of the dead bolt assembly 20. The knob 90 and a dead lock button 91 are configured to extend from the housing 10 towards the inside of a room. The knob 90 and the dead lock button 91 facilitate allowing a person to operate the door lock 100 from the inside of the room. The inside of the room is also referred to as the door inside. Projections 12 are provided on an inner surface of the housing 10. One of the projections 12 is configured to facilitate sliding of the dead bolt assembly 20. The housing 10 is covered by a cover plate 80 which faces the outside of the room. The inside of the room is also referred to as the door inside.

The knob 90 is disposed on the lock housing 10 and connected to a crank 70. The knob 90 is configured to impart rotational motion to the crank 70. The rotational motion of the crank 70 facilitates locking and unlocking of the dead bolt assembly 20 and the latch bolt assembly 60. In a locked configuration, both the dead bolt assembly 20 and the latch bolt assembly 60 remain extended away from the housing 10 through the openings 11. Thus, the door of the room stays closed. In an unlocked configuration, both the dead bolt assembly 20 and the latch bolt assembly 60 remain retracted into the housing 10 through the openings 11. Thus, the door of the room stays open.

As shown in the figure 4, the latch bolt assembly 60 includes a latch bolt 64, a bracket 61, and a cavity 62 which is formed by the bracket 61 on the latch bolt rod. The cavity 62 is provided on the latch bolt rod to operate the latch bolt assembly 60 by the knob 90 through the second link 50 and the first link 30 from the inside of the room and by a key through the first link 30 from outside of the door.

In one embodiment of the present disclosure, the cavity 62 is provided on the latch bolt rod in which a limb 33 of the first link 30 engages with the bracket 61 on the latch bolt assembly 60. The first link 30 is configured to provide sliding movement to the latch bolt assembly 60 by turning of the knob 90 from the inside of the room, as wells as by turning of a cover plate crank when operated from outside of the room by the key.

As shown in the figure 5, the latch bolt 64 is in the locked configuration while the dead bolt 23 is completely retracted and in an unlocked configuration. The knob 90 is configured to be coupled to the dead bolt 23. The dead bolt is configured to be displaced by the knob 90 upon turning of the knob 90 by a person from the door inside. The crank 70 is rotated by the knob 90 to unlock the latch bolt 64. The driving projection 71 of the crank 70 is in contact with a driving lug 52 of the second link 50 and is in position to give rotational motion to the second link 50. The second link 50 rotates about the shaft 40 upon turning of the crank 70. The shaft 40 is configured to be rotatably supported into a hole 22 of a slider 21 that are configured on the dead bolt assembly 20. The shaft 40 is configured with a first step 41 on one end of the shaft 40 which is proximal to the outside of the room, as shown in the figure 11. A second step 43 is configured on the other end of the shaft 40 which is proximal to the inside of the room. The first step 41 of the shaft 40 facilitates mounting of the first link 30. The first step 41 is configured on the shaft 40 proximal to the door outside. The second step 43 of the shaft 40 facilitates mounting of the second link 50. The second step 43 is configured on the shaft 40 proximal to the door inside. The first link 30 and the second link 50 are positioned to be spaced apart by the thickness of the slider 21. The first link 30 and the second link 50 are fixedly attached to the shaft 40. The shaft 40 is rotated by turning of the crank 70 through the second link 50.

As shown in the figure 6, the second link 50 is rotated by the crank 70 on rotation of the knob 90 and the latch bolt 64 is in an intermediate position. In the intermediate position of the latch bolt 64, the first link 30 stays engaged with the latch bolt assembly 60 while partial retraction of the latch bolt 64 is accomplished.

As shown in the figure 7, the second link 50 is further rotated by the crank 70 on rotation of knob 90 and the latch bolt 64 is in an unlocked position. In the unlocked configuration of the latch bolt 64, the first link 30 stays engaged with the latch bolt assembly 60 while a complete retraction of the latch bolt 64 is accomplished. Thus, the door lock 100 is unlocked allowing access to the person present inside the room.

In an embodiment, the dead bolt 23 and the latch bolt 64 are configured to be displaced in an operative horizontal direction that is along the width of the door.

The door lock 100 of the present disclosure facilitates unlocking of the door from the door inside solely by turning of the knob 90. The knob 90 is turned to unlock the dead bolt 23 initially followed by a further rotation to unlock the latch bolt 64. Thus, the need of a separate puller 1’ as required in the door lock 100’ of the prior art is eliminated.

The foregoing description of the embodiments has been provided for purposes of illustration and not intended to limit the scope of the present disclosure. Individual components of a particular embodiment are generally not limited to that particular embodiment, but, are interchangeable. Such variations are not to be regarded as a departure from the present disclosure, and all such modifications are considered to be within the scope of the present disclosure.

TECHNICAL ADVANCEMENTS

The present disclosure described herein above has several technical advantages including, but not limited to, the realization of a door lock, which: is simple in construction; that facilitates increased strength of a door lock; and is easy to operate from the inside as well as the outside of a door.

The embodiments herein, the various features, and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.

The foregoing description of the specific embodiments so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

The use of the expression “at least” or “at least one” suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the disclosure to achieve one or more of the desired objects or results.

Any discussion of documents, acts, materials, devices, articles or the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the disclosure, as it existed anywhere before the priority date of this application.

While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiment as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.