Claims:1.An assembly for portable motorized lifting of weight through fork arm to approach restricted areas; the assembly comprises:
a motor (102), a worm gear box (103),a first chain-sprocket sub-assembly (104) at the motor drive end, a transmission shaft (105), a second chain-sprocket sub-assembly (106) to elevate the fork arm and a support (109a, 109b), wherein
a switch (101) is connected to the motor so as to change direction of rotation of the motor (102);
the motor is provided in connection to the worm gear sub-assembly (103);
the worm gear sub-assembly(103) is connected to the transmission shaft (105) by the first chain-sprocket sub-assembly (104);
the transmission shaft (105) is placed on a support (109a, 109b) and mounted with the second chain-sprocket sub-assembly (106);
the second chain-sprocket sub-assembly (106) drives the fork arm (108), wherein a weight is hooked to said fork arm (108) for being elevated.

2. The assembly as claimed in the claim 1, wherein the motor is induction motor (102).

3. The assembly as claimed in the claims 1-2,wherein the worm gear sub-assembly (103) is connected to one end of the first chain-sprocket sub-assembly (104) and other end of the first chain-sprocket sub-assembly (104) is connected to the transmission shaft (105).

4. The assembly as claimed in the claims 1-3, wherein the transmission shaft is supported by the pair of supporting columns (109a, 109b) by at least one bearing inside each of the pair of supporting columns which enables or supports the transmission shaft (5) while rotating.

5. The assembly as claimed in the claims 1-4, wherein the transmission shaft is connected to one end of the second chain-sprocket sub-assembly (106) and other end of the second chain-sprocket sub-assembly (106) is connected to the fork arm (108).

6. The assembly as claimed in the claims 1-5, wherein the fork arm(108) is guided and supported by a pair of supporting column (107) via sliding.

7. The assembly as claimed in the claims 1-6, wherein a platform (110) accommodates the assembly for the portable motorized lifting of weight through the fork arm(108).
, Description:AN ASSEMBLY FOR PORTABLE MOTORIZED LIFTING OF WEIGHT THROUGH FORK ARM TO APPROACH RESTRICTED AREAS

FIELD OF INVENTION:
[001] The present disclosure, in general, relates to a lifting mechanism to elevate weight through fork arm. More particularly, the present disclosure relates to an assembly for portable motorized lifting of weight through fork arm to approach restricted areas.

BACKGROUND OF THE INVENTION:
[002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.

[003] Fork lift or jack lifts are powered industrial trucks to lift and move materials over short distances. The capacity of fork lift will be normally in the range of 3-5 tons and for Jack lift in the range of 2 tons. However, the assembly cannot be used to approach areas of congested access.

[004] An eccentric lever mechanism for opening and closing gates or doors or operating other parts of any kind or type for which it is adapted is disclosed in U.S. Pat. No. 913490. However, the mechanism is neither portable nor mechanized.

[005] A prior art U.S. Pat. No. 3246876 discloses a similar mechanism by using a hydraulic piston and cylinder arrangement to lift the weight. The mechanism and assembly are not intended for application to intricate areas.

[006] A prior art U.S. Pat. No. 2816675 discloses a lifting mechanism for lifting and transporting relatively heavy objects which when not in use can be collapsed into a relatively small area for storage purposes. However, the invention is not mechanized and can’t approach to limited access areas.

[007] None of the above can fulfil the requirements for which the present invention has been designed. Hence, the present invention has been introduced so as to obviate shortcomings of the known arts.

OBJECTIVE OF THE INVENTION:
[008] An object of present disclosure is to provide an assembly for portable motorized lifting of weight through fork arm to approach restricted areas, which can be used in congested and intricate areas.

[009] Another object of the present disclosure is to provide an assembly for portable motorized lifting of weight through fork arm to approach restricted areas, which is simple in construction.

[0010] Still another object of the present disclosure is to provide an assembly for portable motorized lifting of weight through fork arm to approach restricted areas, which serves the purpose efficiently.

SUMMARY OF THE INVENTION:
[0011] This summary is provided to introduce concepts related to an assembly for portable motorized lift mechanism. The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.

[0012] According to the present invention, there is provided an assembly for portable motorized lifting of weight through fork arm to approach restricted areas; the assembly comprises:
a motor (102); a worm gear box 103); a first chain-sprocket sub-assembly (104) at the motor drive end; a transmission shaft (105); a second chain-sprocket sub-assembly (106) to elevate the fork arm and a support (109a, 109b); wherein
a switch (101) is connected to the motor so as to change direction of rotation of the motor (102);
the motor is provided in connection to the worm gear sub-assembly (103);
the worm gear sub-assembly(103) is connected to the transmission shaft (105) by the first chain-sprocket sub-assembly (104);
the transmission shaft (105) is placed on a support (109a, 109b) and mounted with the second chain-sprocket sub-assembly (106);
the second chain-sprocket sub-assembly (106) drives the fork arm (108), wherein a weight is hooked to said fork arm (108) for being elevated.

[0013] In an embodiment, the present disclosure provides an assembly for portable motorized lift to elevate weight through a fork arm, wherein the assembly comprises an induction motor, a worm gear box (or sub-assembly), a first chain-sprocket sub-assembly at the motor drive end, a transmission shaft, a second chain-sprocket sub-assembly to elevate the fork arm, a pair of column to slide the fork arm, a pair of support column and a platform. A switch is connected to the induction motor so as to change direction of the motor rotation. The motor is further connected to a worm gear sub-assembly. The worm gear sub-assembly is connected to one end of the first chain-sprocket sub-assembly and other end of the first chain-sprocket sub-assembly is connected to the transmission shaft. The transmission shaft is supported by the pair of supporting column with bearings on each of the pair of supporting column and further connected to one end of the second chain-sprocket sub-assembly. The other end of the second chain sprocket sub assembly is further connected to the fork arm. The fork arm is guided and supported by pair of supporting column.

[0014] A platform accommodates the above discussed entire assembly of the present invention.

[0015] The inventive features of the present invention have been depicted in the principal claim and subsidiary features in the subordinate claims.

[0016] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
[0017] The illustrated embodiments of the subject matter will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of devices, systems, and methods that are consistent with the subject matter as claimed herein, wherein:

[0018] Figure 1 illustrates an assembly for portable motorized lifting of weight through fork arm to approach restricted areas in accordance with the present invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT(S) OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWING(S):
[0019] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.

[0020] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[0021] The present disclosure provides an assembly for portable motorized lifting of weight through fork arm to approach restricted areas.

[0022] Now, reference may be made to Figure 1 illustrating the assembly for the lift mechanism (100). A rigid platform (110) supports the entire assembly. The main prime mover or the drive is an induction motor (102). A switch (101) is connected to the motor (102) to control the direction of rotation. The induction motor is connected to a worm gear sub-assembly (103). The advantage of adapting worm gear is its self-locking ability. Further, one end of a first chain-sprocket sub-assembly (104) is connected to the worm gear sub-assembly (103) and the other end of the first chain-sprocket sub-assembly (104) is connected to a transmission shaft (105). The transmission shaft is supported by a pair of supporting columns (109a and 109b) with at least one bearing (not shown) inside each of the pair of the supporting columns. Further, the transmission shaft is connected to one end of a second chain-sprocket sub-assembly (106) and other end of the second chain-sprocket sub-assembly is connected to a fork arm (108). Said second chain-sprocket sub-assembly (106) pulls and drives the fork through its chain. The fork arm is guided and supported by another pair of supporting column (107) through sliding. The single arm or lift arm (108) enables to access constraint area as it does not occupy much space unlike double arm pair used in lift mechanisms like fork lifts.

Operation of the Invention
[0023] Firstly, for controlling the fork arm (108) movement direction, the switch (101) is used to control the rotation direction of the induction motor (102). The switch is utilized to reverse the direction of motor rotation so as to enable up and down motion of the fork. The induction motor’s speed is generally high, so the worm-gear sub-assembly (103) is employed for speed reduction to control the driving speed of the first chain-sprocket sub assembly (104). The speed can be reduced in the range of 1:20 by having the gear ratio of preferably 1:20.Thus, the worm gear helps in reducing the speed of rotation and hence suiting the application.

[0024] Now, the rotational movement of the first chain-sprocket sub-assembly (104) will in turn impart drive to the transmission shaft (105) and thereafter the second chain-sprocket sub-assembly (106) and the fork arm (108). The bearings on the pair of supporting column (109) enables smooth rotation of the transmission shaft.

[0025] Further, the fork arm (108) is connected to a pair of slide column (107) for a guided and aligned motion. A weight can be hooked to the fork arm (108) to be elevated.

[0026] The mechanism is designed to lift weights less than a 100kg which can be hooked to the fork of the mechanism. The fork of the mechanism is designed to lift or elevate weights of 100kg or less to increase the access of the fork. The functioning of the mechanism is made easy by mechanizing the assembly. The arm of the invention is devised slender so that the fork can approach even restricted areas. The invention is used to elevate a weight and unload the same in a place where the approach is limited.

Advantageous Features of The Invention
• A portable lifting mechanism to elevate weight.
• Motorized mechanism.
• Employs gear system for speed reduction and chain-sprocket arrangement for motion transmission.
• The fork arm can fit to areas of restricted access.
• Simple in construction

[0027] Further, it will be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described or shown herein, embody the principles of the invention and are included within its scope.

[0028] Furthermore, all examples recited herein are principally intended expressly to be only for pedagogical purposes to aid the reader in understanding the principles of the invention and the concepts contributed by the inventor(s) to furthering the art and are to be construed as being without limitation to such specifically recited examples and conditions. Also, the various embodiments described herein are not necessarily mutually exclusive, as some embodiments can be combined with one or more other embodiments to form new embodiments.
[0029] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.