Claims:We Claim:
1. A vehicle jack (100), comprising:
a base (101);
a pair of lower arms (102a, 102b), each comprising a first end (200a) and a second end (200b), wherein the first end (200a) of each of the pair of lower arms (102a, 102b) is pivotally connected to the base (101);
a pair of upper arms (103a, 103b), each comprising a lower end (201a) and an upper end (201b), wherein the lower end (201a) of each of the pair of upper arms (103a, 103b) is pivotally connected to second end (200b) of at least one of the pair of lower arms (102a, 102b) respectively, and an upper end (201b) of each of the pair of upper arms (103a, 103b) are pivotally connected to each other,
wherein, the each of the pair of lower arms (102a, 120b) and upper arms (103a, 103b) comprises:
an inner arm (104) and an outer arm (105), wherein the inner arm (104) is telescopically receivable by the outer arm (105);
a slot (106) with a plurality of provisions (107) defined on either sides of the outer arm (105), wherein the slot (106) defines a path for adjusting length of the inner arm (104) with respect to the outer arm (105) and receives a locking member (113) for locking the inner arm (104) with the outer arm (105); and
a drive mechanism disposed between the pair of upper arms (103a, 103b) and the pair lower arms (102a, 102b) for varying height of the jack (100).

2. The vehicle jack (100) as claimed in claim 1, wherein the plurality of provisions (107) in the slot (106) are configured in the form of serrations.

3. The vehicle jack (100) as claimed in claim 1, wherein the inner arm (104) is defined with at least one through hole for accommodating the locking member (113).

4. The vehicle jack (100) as claimed in claim 1, wherein the locking member (113) is a fastener.
5. The vehicle jack (100) as claimed in claim 1, wherein the inner arm (104) of each of the pair of lower arms (102a, 102b) and upper arms (103a, 103b) is locked at identical serrations (107) configured on the corresponding outer arm (105) of each of the pair of lower arms (102a, 102b) and upper arms (103a, 103b), to attain stability of the vehicle jack (100).

6. The vehicle jack (100) as claimed in claim 1, wherein the drive mechanism comprises:
a threaded nut (109) connected to a pivotal joint (203) of the lower end (201a) of the upper arm (103a) and the second end (200b) of the lower arm (102a);
a bearing (110) connected to other pivotal joint (204) of the lower end (201a) of the upper arm (103b) and the second end (200b) of the lower arm (102b); and
a screw (108) receivable by the bearing (110) and extending through the threaded nut (109), wherein, rotation of the screw (108) results in linear movement of the threaded nut (109) to vary the height of the jack (100).

7. The vehicle jack (100) as claimed in claim 6, wherein the screw (108) is a threaded lead screw.

8. The vehicle jack (100) as claimed in claim 1, wherein the base (101) comprises at least one adjustable plate (112) extendable from the base (101).

9. The vehicle jack (100) as claimed in claim 8, wherein the base (101) is defined with a plurality of recesses (114) for accommodating the at least one adjustable plate (112) in a plurality of positions.

10. The vehicle jack (100) as claimed in claim 1, comprises a saddle (111) fixed to the upper ends (201b) of the pair of upper arms (103a, 103b).

11. The vehicle jack (100) as claimed in claim 1, wherein the saddle (111) is defined with a flat portion divided by a cavity (116).
, Description:TECHNICAL FIELD
Present disclosure generally relates to a field of mechanics. Particularly but not exclusively, the present disclosure, relates to a vehicle jack. Further embodiments of the disclosure disclose a universal mechanical vehicle jack which may be adjusted to different operating ranges.

BACKGROUND OF THE DISCLOSURE

Generally, automobile or vehicle parts are prone for unconditional malfunctions or repairs. The most common unconditional damages may be deflating of tyres due to puncture, failure in brake linkages, gear box seizing and the like. These unconditional irregularities have to be timely fixed to achieve normal operating conditions of the vehicle. Since, the vehicles include bulky components such as engine, transmissions, differentials and the like, it may be difficult to lift the vehicle without any mechanical assistance. Further, it may be a tedious process to lift the vehicle from above by a hoist or overhead lifting devices. To overcome the difficulties in lifting the vehicle, lifting elements like jacks have been developed. The jack may be employed to lift the vehicle during breakdown conditions, with minimum human efforts and at a faster rate.

Jack is a device used as a lifting element to lift heavy loads or to apply great forces with minimum efforts. Generally, jacks are used to lift a vehicle for changing wheels and repairing other parts, which are employed beneath the vehicle. The jack assemblies may be classified based on method of operation, and the broad classification may include mechanical jack assembly, and a hydraulic jack assembly. The mechanical jack may broadly comprises a combination of links, pins, a lead screw and other subsidiary components, which may be made of high strength materials. The operating range of the mechanical jack assembly may be confined to certain limit based on height to which the load to be lifted. Due to confined operating range of the mechanical jack assemblies, it demands for using different jack assemblies for different applications or different vehicle i.e. the weight of the load to be lifted and height to which the load to be lifted. To cater to different requirements, hydraulic jacks have been developed and used in the vehicles. The hydraulic jacks may generally include a hydraulic cylinder and a piston arrangement. The piston may be raised or lowered by varying pressure of fluid in the cylinder. However, hydraulic jacks are heavy, bulky and require frequent configuration. In the recent past, trunk of the vehicles may be packed with various articles and other required commodities. Hence, positioning of heavy jacks in an available space will be a packaging challenge.

With the on-going developments, efforts have been made to develop a collapsible type mechanical jacks. The collapsible type mechanical jack assemblies may include collapsible arms, which facilitates in increasing the operating range of the jack assembly. The jack assembly may be adapted to lift vehicles to different heights, by adjusting length of the arms and locking the arm, based on the requirement. In order to lock the arm for a desired length, a plurality of holes are provided on upper surface of the arm such that the, the locking pin may extend through the hole to lock the arm at desired location. However, during operation of the jack, the pin provided to lock may be subjected to stresses and shear forces, which may lead to failure of the jack. Also, it becomes tedious for operating the locking pin, in order to vary the length of the arm to vary the operating range of the jack. Additionally, the jack assembly includes more number of components making the jack bulky which may not be desirable. Hence, the conventional collapsible type jack assembly may have poor durability and may be less stable during lifting of heavier loads to higher heights.

The present disclosure is directed to overcome one or more limitations stated above and any other limitations associated with the prior arts.

SUMMARY OF THE DISCLOSURE

One or more shortcomings of conventional assemblies are overcome and additional advantages are provided through the provision of a vehicle jack as claimed in the present disclosure. Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.

In a non-limiting embodiment of the disclosure, a vehicle jack is disclosed. The jack comprises a base, a pair of lower arms, each comprising a first end and a second end, wherein the first end of each of the pair of lower arms is pivotally connected to the base. Further, the jack comprises a pair of upper arms , each comprising a lower end and an upper end, wherein the lower end of each of the pair of upper arms is pivotally connected to second end of at least one of the pair of lower arms, and an upper end of each of the pair of upper arms are pivotally connected to each other. Additionally, each of the pair of lower arms and upper arms comprises an inner arm and an outer arm, wherein the inner arm is telescopically receivable by the outer arm. The outer arm is configured with a slot having a plurality of provisions defined on either sides of the outer arm. The slot defines a path for adjusting length of the inner arm with respect to the outer arm and receives a locking member for locking the inner arm with the outer arm. The jack also comprises a drive mechanism disposed between the pair of upper arms and the pair lower arms for varying height of the jack.
In an embodiment, the plurality of provisions in the slot are configured in the form of serrations.

In an embodiment, the inner arm is defined with at least one through hole for accommodating the locker member such as fastener.

In an embodiment, the inner arm of each of the pair of lower arms and upper arms is locked at identical serrations configured on the corresponding outer arm of each of the pair of lower arms and upper arms to attain stability of the jack.

In an embodiment, the vehicle jack comprises a driving unit comprising a threaded nut connected to one pivotal joint of the lower end of the upper arm and the second end of the lower arm, a bearing connected to other pivotal joint of the lower end of the upper arm and the second end of the lower arm. The driving unit also includes a screw such as lead screw, receivable by the bearing and extending through the threaded nut, wherein, rotation of the screw results in the linear movement of the threaded nut to adjust vary the height of the jack .

In an embodiment, the vehicle jack comprises at least one adjustable plate connectable to the base and the adjustable plate is defined with a plurality of recesses for accommodating the at least one adjustable plate in a plurality of positions.

In an embodiment, the vehicle jack comprises a saddle, fixed to the upper ends of the upper arms. The saddle is defined with a flat portion divided by a cavity.

It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined together to form a further embodiment of the disclosure.

The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS

The novel features and characteristic of the disclosure are set forth in the appended claims. The disclosure itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying drawings. One or more embodiments are now described, by way of example only, with reference to the accompanying drawings wherein like reference numerals represent like elements and in which:

Figure. 1 illustrates a perspective view of a vehicle jack, in accordance with an embodiment of the present disclosure.

Figure. 2 illustrates front view of the vehicle jack of Figure. 1.

Figure. 3 illustrates magnified view of portion A of figure. 1, depicting base of the vehicle jack configured with an adjustable plate.

Figure. 4 illustrates bottom view of the vehicle jack of figure. 1, in accordance with an embodiment of the present disclosure.

Figure. 5a-5d illustrates different positions of the inner arm inside the outer arm of the vehicle jack, in accordance with an embodiment of the present disclosure.

The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION

While the embodiments in the disclosure are subject to various modifications and alternative forms, specific embodiment thereof has been shown by way of example in the figures and will be described below. It should be understood, however, that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure.

It is to be noted that a person skilled in the art would be motivated from the present disclosure and modify various constructions of the jack which may be used to lift vehicles. However, such modifications should be construed within the scope of the disclosure. Accordingly, the drawings show only those specific details that are pertinent to understand the embodiments of the present disclosure, so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having benefit of the description herein.

The terms “comprises”, “comprising”, or any other variations thereof used in the disclosure, are intended to cover a non-exclusive inclusion, such that a device, system, assembly that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such system, or assembly, or device. In other words, one or more elements in a system or device proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or device.

Embodiments of the present disclosure disclose a vehicle jack [hereinafter referred as jack], which may be used for lifting vehicles to a certain height above the ground level. Conventionally, different jacks are to be used for different applications based on the weight of the vehicle to be lifted, height to which the vehicle has to be lifted and stowage space available inside the trunk of the vehicle. Designing and manufacturing different configuration of jacks based on the requirement may lead to increase in inventory maintenance cost, design and maintenance cost. Moreover it may lead to scrapping of jack when the vehicle is scraped, since the jack may not be adapted to use in other applications, due to limited operating range of the jack . Further, in the recent past, due to limited space in the trunk of the vehicle, demands for small dimension jacks and without compromising on the reliability. Hence, by eliminating the use of different jack for lifting different weights to a different height, results in optimizing time and overall cost and moreover assists in recycling of the jack assembly. The present disclosure, aims at using a jack which may be configured as an universal jack with wide operating range, in order to lift the vehicles to different heights based on the requirement.

Accordingly, embodiments of the present disclosure disclose a vehicle jack with wide operating range. The jack may be adapted for lifting vehicles to different height ranges irrespective of weight of the vehicles. The jack primarily comprises a base, a pair of lower arms, a pair of upper arms, driving mechanism and a saddle, mounted on the upper portion of the jack . Each of the pair of lower arms comprises a first end and a second end, wherein the first end of the pair of lower arms is pivotally connected to the base using suitable connecting means, including but not limiting to rivet pins. Further, each of the pair of upper arms comprises a lower end and an upper end, wherein the lower end of each of the pair of upper arms is pivotally connected to second end of at least one of the pair of lower arms, and an upper end of each of the pair of upper arms are pivotally connected to each other.

Further, each of the pair of upper and lower arms comprises an inner arm and an outer arm, which are connected in such a way that, the inner arm may be telescopically receivable by the outer arm i.e. the inner arm is configured to slide to and fro within the outer arm. The outer arm of each of the pair of upper and lower arms may be configured with a slot comprising a plurality of provisions in form of serrations on either sides. The slot provisioned in the outer arm defines a path for adjusting length of the inner arm and is also configured to receive a locking member for locking the inner arm with the outer arm for a required length based on the application. In an embodiment, changing the length of the inner arm may results in change in the operating range of the jack. The driving mechanism of the jack comprises a threaded nut, a bearing and a threaded lead screw. The threaded nut and the bearing may be connected to the pivotal joints of the upper and lower arms. The bearing may be primarily configured to receive a lead screw, which further extends through the threaded nut, to join the opposite side of the jack , in a way that permits raising and lowering of the jack by rotation of the lead screw.

In the following description, the words such as upper, lower, and the like are referred with respect to particular orientation of the jack as illustrated in drawings of the present disclosure. The words are used to explain the aspects of the present disclosure and for better understanding. However, one should not construe such terms as limitation to the present disclosure, since the terms may interchange based on the orientation of the jack.

The following paragraphs describe the present disclosure with reference to Figures. 1 to 5d. In the Figures, the same element or elements which have similar functions are indicated by the same reference signs.
Figures. 1 and 2 are exemplary embodiments of the present disclosure, illustrating a perspective view and a front view of the vehicle jack (100) respectively, which may be used for raising vehicles to a certain height above the ground level. The jack (100) broadly comprises of a base (101), a pair of lower arms (102a, 102b) a pair of upper arms (103a, 103b), drive mechanism comprising a threaded nut (109), a bearing (110) and a lead screw (108). The base (101) of the jack (100) is configured as a support for all the components, and may be prone to receive the entire load during the operation. The base (100) may be in the form of a rigid plate, with a upwardly extending portion, and a flat bottom portion. The base (101) may accommodate at least one adjustable plate (112) [best seen in Figure. 4] in a plurality of positions with the aid of a plurality of fasteners such as wing screws (115) [best seen in figure. 3]. The adjustable plate (112) may be retracted by operating the fastening members such as wing screws (115) to increase the size of the base (101) to provide additional stability to the jack (100) during operation i.e. during raising or lowering of the vehicle.
As shown in figure. 2, each of the pair of lower arms (102a, 102b) of the jack (100) comprises a first end (200a) and a second end (200b). The first end (200a) of each of the pair of lower arms (102a, 102b) may be pivotally connected to the base (101). In an embodiment, the first ends (200a) of the pair of lower arms (102a, 102b) may be connected to the base (101) using rivet pins to achieve pivotal movement, which in turn assist in raising or lowering of the jack (100) during operation. Further, the each of the pair of upper arms (103a, 103b) of the jack (100) comprises a lower end (201a) and an upper end (201b), wherein the lower end (201a) of each of the pair of upper arms (103a, 103b) may be pivotally connected to second end (200b) of at least one of the pair of lower arms (102a, 102b). The upper end (201b) of each of the pair of upper arms (103a, 103b) are pivotally connected to each other. In an embodiment, the arms (102a, 102b,103a,103b) may be essentially of identical cross section and length in order to maintain accurate static balancing of the jack (100).
Further, each of the pair of upper arms (103a, 103b) and lower arms (102a, 102b) comprises an inner arm (104) and an outer arm (105). The outer arm (105) and inner arm (104) are configured such that the inner arm (104) is telescopically receivable by the outer arm (105). In an embodiment, dimension of the inner arm (104) may be slightly less than the outer arm (105) in order to maintain minimum clearance for easy sliding of the inner arm (104) within the outer arm (105). The outer arm (105) of the each of the pair of lower arms (102a, 102b) and upper arms (103a, 103b) may be configured with a slot (106) having a plurality of provisions (107) defined on either sides of the outer arm (105). In an embodiment, the plurality of provisions (107) in the slot (106) are configured in the form of serrations (107). As an example, the serrations (107) may be of rectangular or elliptical in cross-section and the number of serrations (107) may be in a range of around 5-10 based on the requirement. The inner arm (104) of each of the pair of upper arms (103a, 103b) and lower arms (102a, 102b) is provisioned with a through hole. The plurality of serrations (107) configured on either sides of the outer arm (105) and a through hole configured in the inner arm (104) receives a locking member (113) such as nut and bolt arrangement, to lock the inner arm (104) with the outer arm (105) at a required length. In an embodiment, length of the inner arm (104) may be adjusted by sliding the inner arm (104) inside the outer arm (105) and locking the inner arm (104) with the outer arm (105). In an embodiment, through hole defined in the inner arm (104) may be adapted to coincide with at least one of the serrations (107), in order to facilitate easy movement of the locking member (113) to lock the inner arm (104) with the outer arm (105) at a required length. In an embodiment, varying the length of the inner arm (104), results in varying the operating range of the jack (100).
The driving mechanism for raising and lowering of the jack (100) comprises of a threaded nut (109) connected to one of the pivotal joint (203) formed by the lower end (201a) of the upper arm (103a) and the second end (200b) of the lower arm (102a). A bearing (110) connected to other pivotal joint (204) formed by the lower end (201a) of the upper arm (103b) and the second end (200b) of the lower arm (102b), and an elongated screw (108). The elongated screw (108) may be primarily receivable by the bearing (110) and extends through the threaded nut (109). In an embodiment the screw (108) is a threaded lead screw. Further, in another embodiment, an end of the lead screw (108) towards the bearing (110) is configured with a socket (117), which assist in accommodating a tool to facilitate rotation of the lead screw (108), in order to raise or lower the jack (100) with minimum operating efforts. In order to operate the jack a (100). i.e. during raising condition, the lead screw (108) may be rotated in clockwise direction, wherein rotation of the lead screw (108) initiates linear movement of the threaded nut (109) towards the bearing (110), to raise the height of the jack (100). Likewise, rotation of the lead screw (108) in anticlockwise direction results in linear movement of the threaded nut (109) away from the bearing (110), thus results in lowering height of the jack (100).
In an embodiment, the length of the lead screw (108) may be twice the length of the lower arms (102a, 102b) and upper arms (103a, 103b), such that the lead screw (108) accommodates the threaded nut (109) during minimum and maximum operating range of the jack (100).
The jack (100) further comprises a saddle (111) fixed to the upper ends (201b) of the upper arms (103a, 103b) and configured to contact the component to be lifted. In an embodiment, the saddle (111) may be fixed by rivet pins. The saddle (111) is configured with a flat portion on the top and divided by a cavity (116) at the centre. The saddle (111) may be configured such that it can be easily adjusted to different fitments for lifting the vehicle.
Now referring to figures 5a and 5d, which are exemplary embodiments of the present disclosure, illustrating different positions of the inner arm (104) inside the outer arm (105) depicting different operating ranges of the jack (100). The inner arms (104) of each of the pair of upper arms (103a, 103b) and the lower arms (102a, 102b) are adjusted based on the height to which the component has be lifted. In order to adjust the inner arm (104), the locking member (113) may be initially disengaged and then the inner arm (104) may be moved forward or backward between the extreme points inside the outer arm (105), based on the requirement. Figure. 5a depicts the jack (100) with the inner arms (104) fully collapsed inside the outer arms (105) of each of the pair of upper arms (103a, 103b) and lower arms (102a, 102b). This position of the inner arm (104) inside the outer arm (105) depicts the minimum operating range of the jack (100). Also, this position of the inner arm (104) inside the outer arm (105) reduces the overall dimensions of the jack (100) and thus occupies minimum storage area. Figure. 5b and 5c depicts the jack (100) with the inner arm (104) positioned and locked at a plurality of intermediate positions inside the outer arm (105). This position of the inner arm (104) inside the outer arm (105) also assists in varying the operating range of the jack (100), based on the requirement. Figure. 5d depicts the jack (100) with the inner arm (104) in fully retracted position inside the outer arm (105). This position of the inner arm (104) inside the outer arm (105) depicts the maximum operating capacity of the jack (100).
In an embodiment, the slot (106) with plurality of serrations (107) may be configured on either sides of the inner arms (104) of each of the pair of upper arms (103a, 103b) and lower arms (102a, 102b). Further, in another embodiment, the inner arm (104) may be configured with plurality of through holes at regular intervals to accommodate multiple locking members (113), thus provides additional stability and strength to the jack (100) during raising or lowering and holding the component at the desired height.
In an embodiment, the inner arms (104) of the lower and upper arms (102a, 102b and 103a, 103b) may be locked at identical serration of the plurality of serrations (107) configured in the outer arm (105), to achieve identical dimensions of all the arms in order to maintain static balance of the jack (100).
In an embodiment, the jack (100) is simple in construction, light in weight, adapted to lift variety of lifting ranges, which results in saving tooling cost, inventory and maintenance cost.

Equivalents:

With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.
It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as "open" terms (e.g., the term "including" should be interpreted as "including but not limited to," the term "having" should be interpreted as "having at least," the term "includes" should be interpreted as "includes but is not limited to," etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an" (e.g., "a" and/or "an" should typically be interpreted to mean "at least one" or "one or more"); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of "two recitations," without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to "at least one of A, B, and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, and C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances, where a convention analogous to "at least one of A, B, or C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, or C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase "A or B" will be understood to include the possibilities of "A" or "B" or "A and B."

While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

Referral Numerals:
Referral numeral Description
100 Vehicle jack
101 Base
102a, 102b Pair of lower arms
103a, 103b Pair of upper arms
104 Inner arm
105 Outer arm
106 Slot
107 Serrations
108 Lead screw
109 Threaded nut
110 Bearing
111 Saddle
112 Adjusting plate
113 Locking member
114 Plurality of recesses
115 Wing screw
116 Cavity
117 Socket
200a First end of the lower arms
200b second end of the lower arms
201a Lower end of the upper arms
201b Upper end of the upper arms
203, 204 Pivotal joints