MX2008003729A - Weight-measuring device - Google Patents

Abstract

A weight-measuring device is described that is adapted to be attached between two objects, and to be brought to a stretched state and to an unstretched state. The device may be attachable to a harness of the type which comprises a pair of shoulder strap assemblies, for example of the type used with backpacks, parachute units or similar constructed systems for holding or carrying an object or load to a person's body. The weight-measuring device comprises a force resistance element altered by the application of force thereto, and a weight indicator providing an indication of the force magnitude applied thereto.

Description

WEIGHT METER DEVICE DESCRIPTION OF THE INVENTION This invention relates to a weight / load measuring device, and more particularly, to a weight / load measuring device that is adapted to be joined between two objects to measure the force magnitude between the same. A backpack, also known by the names "bag for books", "barjuleta", "backpack", "knapsack", "bagga", "parachute", is a type of bag comprising a portion of harness and a bag portion , and is a popular and effective way to carry a medium for heavy loads while walking. Originally the backpacks were developed for use by the army and hikers and have become, over time, a common cargo transport device. However, although backpacks are generally considered a good cargo transport device due to the fact that they distribute the weight along some of the larger muscles of the body, the use of them can lead to psychological problems and anatomical, especially in cases in which excessively large loads are carried by schoolchildren. Hereinafter in the specification and drawings, all the different types of bags will be collectively referred to as 'backpacks'.

Medical authorities have established certain guidelines and recommendations to demonstrate that inadequate use and use of bags can lead to a muscle imbalance that can result in chronic problems in the neck and back. A clearly important guideline is that it has been shown that lifting too much weight with the shoulders over a long period is detrimental to the back, causing problems ranging from simple discomfort and fatigue to spinal compression, back pain and misalignment of the spine, conditions that can persist into adulthood. The problem has intensified in recent years, as young children have been carrying overloaded bags. In particular, both the American Academy of Orthopedic Surgeons (AAOS) and the Consumer Product Safety Commission (CPSC) warn that more children suffer back and shoulder injuries due to improper use of their backpacks. Many experts recommend that a child carry no more than 15% of their body weight in a backpack to avoid the increased risk of skeletal muscle injury. Children from basic education to upper secondary education currently charge much more than this amount. Excessive weight of a backpack can cause functional scoliosis or curvature of a healthy spine at any age. It is emphasized that even Adults should not load more than 25 Kg. in a bag. The best way to avoid the risk due to backpacks with overload is to determine directly if a particular load, in the backpack that is loaded, is too heavy for the person to carry it. Although the placement of the bag on traditional scales may be adequate to determine the weight of a bag, the scales are not always available to weigh a backpack to make sure it is not overloaded. This problem is addressed in the Publication of U.S. Patent Application No. 2005/0051586 to Siwak et al. , describing a weight determination mechanism and a method for determining the weight of a loaded piece of luggage, particularly a bag. In general, the mechanism is incorporated in a carrying handle of the piece of luggage that allows it to be integrated with the baggage and that allows it does not take up additional space to the same time that allows quick and easy determinations without the need of an external scale In addition to the dangers caused by the excessive weight of the backpack, health professionals recommend that the total load should be equally divided between the two support straps to prevent orthopedic injuries associated with excessive weight shifting towards a particular shoulder or right shoulder. left. It is difficult to conclude about the optimal configuration of a bag and a harness if the wearer is not aware of the importance of the weight distribution between the two shoulders. The asymmetrical weight distribution causes the wearer to stand upright in an appropriate upright position and therefore can lead to spinal injuries, muscle tears or similar problems. In addition, overloading the shoulders of the wearer can also cause local injuries, such as tearing of the trapezius muscle, compression of the nerve roots near the spine, etc. By maintaining a natural posture, a person experiences an important difference between an upright stability from side to side and from front to back. It is essential that you maintain a natural posture as accurate as possible when loading a bag. For side-to-side stability, the bag should be loaded symmetrically and uniformly on each side. The symmetrical load is of particular importance, since, when most of the weight of the bag is loaded when thrown on one shoulder, this encourages the carrier to flex laterally. Such abnormal posture is even more exaggerated when a heavy bag is loaded. To maintain stability from side to side of the body, first consider that there is no significant extra weight applied to one shoulder compared to the other. Unbalanced load hurts the shoulders while putting pressure over the shoulder and over time can also lead to circulatory or nervous disorders. There are numerous known systems for bags, which attempt to balance the load, increase comfort and improve convenience for the carrier. For example, US Patent No. 4,217,998 to Alexander discloses a device comprising a set of two elongated tubes, arranged in telescopic relation to each other with a spring-operated push button carried by the inner tube which adjustably and releasably interlaced the tubes , in such a way that they can have different combined, desired lengths. One of the tubes has a skid resistant backpack support strap attached at its front end and the other of the tubes has a back frame connector of the backpack secured pivotably to its rear end. The improved backpack uses a pair of the novel devices described, connected on opposite sides of the back frame of the backpack and projecting forward to attach the two support straps of the backpack. In this way, the two devices are arranged on opposite sides of the backpack. Its purpose is to change the center of gravity and the balance of the backpack from the front to the back of the vertical middle line of the backpacker when standing with the backpack in its place, that is, from a very awkward and awkward position to a position more comfortable forward adjacent to that vertical middle line of the backpacker, without the backpacker having to continually pull the backpack support straps and stoop to achieve weight change. U.S. Patent Publication No. 2004/0065708 for Amram describes a backpack that has straps that can be repositioned, removed and replaced and that is designed to reduce muscle tears when the bag is loaded by improving the balance of the load. Changing the position of the straps can allow a person to shift the load closer to the center of the body to reduce the influence exerted by an unbalanced load. An additional feature is that removable belts can be exchanged or replaced in a cheap way with other belts that have different colors, brands, advertising or other symbols of sponsorship or affiliation. International Patent Publication No. WO / 2004/100706 for Manoni discloses a balanced backpack of the type comprising bag receptacles held on the shoulders of a user by support straps, allowing an adequate weight distribution, with a front-rear balance , as well as a lateral balance, and comprising: a rear bag receptacle associated with a chest by means of a pair of support straps, the rear bag receptacle is located symmetrically with respect to the support belts; a fastening point associated with the support straps and located frontally to the chest in a symmetrical position; a bag receptacle that can be fastened to the fastening point in order to load the associated load thereon, wherein the weight that can be loaded in each bag receptacle with respect to the volume of the bag containers has a frontal proportion / posterior from 2.0 to 0.8. The present invention relates to a weight / load measuring device that is adapted to be joined between two objects to measure the forces between them. According to one aspect of the present invention, there is provided a weight / load measuring device that is adapted to be joined between two objects to measure the magnitude of force between them, which comprises a force resistance element altered by the application of force to it, and a weight indicator that provides an indication of the amount of force applied to it; the device is adapted to put it in a stretched state and in an unstretched state, such that when the weight measuring device is in the stretched state, the force resistance element is altered by the application of forces by means of the two objects, and when the weight measuring device is in the state not stretched, the force resistance element is not altered by the application of forces by the two objects, the non-stretched state therefore improves the calibration duration of the force resistance element. There are signals provided for the stretch state of the weight indicator that corresponds to the weight applied to it. The calibration duration of the weight measuring device is improved by reducing the time that the force resistance element is altered. Multiple weight measuring devices can be attached to multiple objects to determine the asymmetric load between the objects. For example, a backpack fitted with two support straps can be provided, each fitted with a weight measuring device according to the invention. In the event that the measuring device indicates an asymmetric load, a user may wish to correct the imbalance. In this way, the weight measuring device can further comprise an equilibrium mechanism that is adapted to change the magnitude of force between the two objects between which it is attached. The balancing mechanism can be adapted to lengthen and / or shorten the distance between the two objects, thereby changing the magnitude of force between them. The balance mechanism can be a part integral of the weight measuring device. The force resistance element can be a belt that is made of an elastic material. The elastic material can be made of natural rubber, however, any suitable material can be used. The weight indicator may comprise a numerical scale associated with the force resistance element, or other indication means, such as a color scale, a scale provided with geometric illustrations, etc. The weight measuring device may further comprise a viewing window for displaying the weight indicator. The display window can be adjusted with a magnifying glass to improve the display of the scale. The two objects between which the weight measuring device is attached may be two portions of a belt of a harness support belt assembly. The harness can be part of a backpack or a parachute device, etc. According to a further aspect of the present invention, there is provided a harness comprising a pair of support belt assemblies, with each support belt assembly including a weight measuring device according to the present invention, including any or another of the characteristics described in the above.

The harness can allow a user to provide balance control, quickly and easily, of the support belt assemblies by operating the weight measuring device to determine the weight load carried by each shoulder along with the toral load carried by the user and adjust as required. If the harness is part of a backpack, and a user who is using it is assured, the weight of the backpack worn by the user can be measured by activating both weight measuring devices simultaneously, providing the approximate total weight of the the backpack worn by the user. Additionally, the activation of only one of the weight measuring devices can present the weight carried by the corresponding shoulder belt assembly. A particular advantage of this aspect is the potential to provide an easy awareness of the parents about the burden and balance thereof caused in a child wearing such a backpack. Allowing, therefore, that the parents avoid problems caused due to an excessive load, asymmetric belt configuration and / or imbalance of weight between the shoulders. Equilibrium correction can also be performed by readjusting the straps in the harness using fasteners in the shoulder strap assemblies and / or by rearranging the contents of the bag (i.e. change heavy objects from one side to another). In accordance with any of the above aspects, the weight measuring device can also be adapted to be disassembled from the objects to which it is attached, or it can be designed to permanently join the two objects. Therefore, the most important characteristics of the invention have been described, in very general terms, in such a way that the detailed description thereof which can be inferred in the following can be better understood, and the present contribution to the technique can be appreciated. best. Further details and advantages of the invention will be set forth in the detailed description. The invention establishes a force measurement device for connecting force application points and for measuring a force between them, the force measurement device includes a force measurement mechanism designed in such a way that an accuracy of the mechanism when measuring a force Strength does not decrease by force application points over time. According to one of its aspects, the invention is directed to a force measuring device to connect between force application points and to measure a force between them, the force measurement device includes a force adjustment mechanism designed for Adjust gradually a distance between the points of application of force. The prior art provides several examples of charge balancing / measuring devices. Although some of these devices can be used to measure and / or adjust the load distribution in backpacks, such designs experience several inherent limitations. The load measuring devices of the prior art employ load measuring mechanisms that also function in load support and, as such, these mechanisms exhibit a loss in measurement quality over time due to a plastic stretch instead of elastic and similar. In addition, prior art devices that allow for load adjustment use buckles and straps that can not be adjusted by precise and gradual adjustment actions that can be accurately repeated. This limitation is particularly problematic in the case of backpacks in which the precise adjustment of two belts is required for an adequate load adjustment. By reducing the present invention to practice and having the specific objective of preventing these limitations from the prior art designs, a load measurement and adjustment device has been designed that includes an accurate load measuring mechanism that does not decrease in quality of measurement over time and a mechanism of load distribution that is gradual, repeatable and accurate. The device, according to the present invention, also suitable as an "independent" article, that is, suitable for a separate accessory article that can be detachably connected to any device. BRIEF DESCRIPTION OF THE DRAWINGS In order to understand the invention and to see how it can be carried out in practice, various modalities will be described below, by way of non-limiting examples only, with reference to the accompanying drawings, in which: Figure 1A is a perspective view of a weight measuring device according to a first embodiment of the present invention; Figure IB is a perspective view of the weight belt of the weight measuring device illustrated in Figure 1A; Figure 1C is a side view of the weight belt illustrated in Figure IB; Figure ID is a perspective view of a portion of the weight belt illustrated in Figure IB and 1C attached to a first belt; Figure 1E is a perspective view of the weight measuring device illustrated in Figure 1A, joined between a first belt and a second belt, by example of a backpack; Figure 1F is an isometric, schematic cross-sectional view of the weight measuring device illustrated in Figure 1E; Figure 1G is a schematic side cross-sectional view of the weight measuring device illustrated in Figure 1E; Figure 1H is an enlarged view of the portion marked G in Figure IC Figure II is the same as Figure 1H, with a button in the housing being depressed; Figure 1J is a weight measuring device of the type illustrated in Figures 1A-1I, hinged in removable / mountable form to a backpack; Figure 1K is a weight measuring device of the type illustrated in Figures 1A-1I, attached to a backpack; Figure 2A is a perspective view of a further embodiment of a weight measuring device according to the present invention, including an integral balance mechanism. Figure 2B is an exploded view of the balancing mechanism of the weight measuring device illustrated in Figure 2A; Figure 2C is a lower exploded view of the balancing mechanism illustrated in Figure 2B; Figure 2D is an assembled view of the balance mechanism illustrated in Figures 2B and 2C; Figure 2E is an isometric, schematic cross-sectional view of the weight measuring device illustrated in Figure 2A; Figure 2F is an enlarged view of a portion of the weight measuring device illustrated in Figures 2A and 2E; Figure 2G is a schematic sectional side view of the weight measuring device illustrated in Figures 2A and 2E-2F; Figure 2H is a schematic, enlarged side view of the weight measuring device illustrated in Figures 2A and 2E-2G; Figure 21 is a bottom view of the weight measuring device illustrated in Figures 2A and 2E-2H; Figure 3A is a perspective view of a further example of a weight measuring device of the present invention, including an integral balance mechanism; Figure 3B is an exploded view of the weight measuring device illustrated in Figure 3A, which excludes belts; Figure 3C is a cross-sectional, isometric view of the weight measuring device illustrated in Figure 3A, which excludes the lower strap; Figure 3D is a plan view of the lower housing component shown in Figures 3A-3C; Figure 3E is an isometric view of the lower housing component illustrated in Figure 3D; Figure 3F is an alternate isometric view of the lower housing component illustrated in Figure 3D; Figure 3G is an isometric view of the weight measuring device illustrated in Figure 3B, which excludes the upper and lower housing element, with the elastic strap in an unstretched position; Figure 3H is an isometric view of the weight measuring device illustrated in Figure 3G, with the elastic belt in a stretched position; Figure 31 is an internal side view of a portion of the weight measuring device illustrated in Figure 3A; Figure 3J is an enlarged isometric view of a portion of the balance mechanism illustrated in Figures 3A-3C, 3G and 3H when the lever is not actuated; Figure 3K is an enlarged isometric view of a portion of the balance mechanism illustrated in Figure 3J, when the lever is not actuated; Figure 3L is a plan view of the device shown in Figure 3A, which excludes the component of upper housing and the upper and lower straps when the belt extension button is not activated; and Figure 3M shows a plan view of the device shown in Figure 3L when the belt extension button is not activated. The principles and operation of a rucksack, in accordance with the present invention, can be better understood with reference to the description and the accompanying drawings in which embodiments of the invention are illustrated. It should be understood that these drawings are provided for illustrative purposes only and do not mean that they are limiting. The present invention can be represented in many different forms and should not be construed as limiting for the embodiments set forth herein. The same reference numerals and alphabetic characters will be used to identify those components that are common in the backpack and its components shown in the drawings throughout the present description of the invention. Referring now to Figure 1A, a first embodiment of a weight measurement device 100 is illustrated. The weight measuring device 100 comprises a weighting belt 102, a housing 104 through which the weighting belt 102 slots, a pin 106 (Figure 1F) mounted inside the housing 104 and a trigger 108 (Figure 1F) ) pivoting on the safety 106 and normally deviated in the clockwise direction. Turning now to Figures 1B-1C, the weighting belt 102 comprises a force resistance element 110 in the form of an elastic portion made of natural rubber, and a plastic portion 112, integrated through a manufacturing process or articulated later. Although any suitable material with elastic properties can be used for the elastic portion, during the investigation performed for the current invention, natural rubber showed to have advantageous qualities over other tested elastic materials. Similarly, the plastic portion does not necessarily have to be made of plastic, but, instead, must be made of a material that does not have elastic properties and that does not deform with the load to which the measuring device 100 is expected to be subjected. of weight. The elastic portion 110 comprises an upper end 114, an intermediate portion 116 and a lower end 118. The upper end 114 comprises a protruding portion 120 which, briefly referring to Figure 1A, when the weight measuring device 100 is assembled and consequently the weighting strap 102 is inserted through the housing 104, is fixed to the part of the housing 104, and is thicker than the groove 142 (FIGS. 1F and 1G) in the housing 104 with which it is adjacent. Returning to Figures IB and 1C, the intermediate portion 116 is thinner than the protruding portion 120, and when the elastic portion 110 is inserted through the housing 104, the intermediate portion 116 slides easily through the first groove 142. (Figures 1F and 1G) to which the outgoing portion 120 is fixed, for reasons that will become apparent later. The plastic portion 112 comprises an upper middle section 122 formed integrally with the lower end 118 of the elastic portion 110, and a lower middle section 124. The upper middle section 122 comprises two narrow columns 126 of inclined, unidirectional teeth, arranged along the edges thereof and a weight indicator in the form of a series of ascending numbers 128, for indication of the weight measurement, between the teeth 126. In this respect, the numbers 128 in the elastic portion 110 are separated in a calculated manner, proportionally with the amount of force required to stretch the elastic portion 110; alternatively, instead of numbers there may be other indications such as drawings, colors, etc. The lower middle section 122 comprises a coupling slit 130 in the form of a rectangular slit. Directing attention additionally to the Figure ID, the coupling slit 130, in this example, is used to allow the connection of the weight measuring device 100 to a first strap 132 of a harness (not shown) by a buckle 134 and an equilibrium mechanism in the form of a 136 strap bra. It should be noted that the coupling element 130 can be used to attach it to the object to be measured by any standard connection component. Referring now to Figures 1E-1G, the weight measurement device 100 is shown connected between a first belt 132 (which in the context of a harness of a backpack can be referred to as a "lower belt") and a second belt. 138 (which in the context of a harness of a backpack can be referred to as a 'top strap'). The second belt 138 comprises a cavity 140, into which a sleeve-like portion 105 of the housing is inserted. The second belt 138 is joined, for example, by sewing, around the sleeve-like portion 105 of the housing 104 within the cavity 140, to secure the position of the housing 104 therein. The housing portion 104 comprises a first slot 142, a second slot 144, a button 146 that can be depressed and a viewing window 148. As mentioned in the above, the weighting belt 102 is slotted through the housing 104, this is achieved by the first groove 142 and second groove 144. In Figure 1G, it is clearly shown that the elastic portion 110 of the weighting belt 102 is slitted through the first groove 142 and fixed thereto by the protruding portion 120, while the plastic portion 112 is capable of a sliding movement through the second slot 144. The viewing window 148 is positioned above at least one of the series of numbers 128 and is made of magnifying glass for easy viewing easy of them. The trigger 108 comprises a slot 150 adapted for the insertion of the pin 106, a pointed distant projection 152 adapted for coupling the teeth of the narrow columns of inclined, unidirectional teeth 126 in the plastic portion 112, and a button portion 154 arranged at the end of the trigger 108 under the button 146 of the housing portion 104. A pin 106 is mounted inside the housing 104 to support the trigger 108 pivotally mounted therein. Operation of the weight measurement device: With reference first to Figure 1E, in operation, the weight measurement device 100 necessarily joins between two objects. As mentioned in the above, in this embodiment the device 100 for measuring Weight is connected between a first belt 132 and a second belt 138. Referring now to Figure 1H, the trigger 108 is shown in its normally deflected position, with the projection 152 distally engaging the teeth 126. In this position, the stretching of the the weighting belt 102, created, for example, by a force exerted on the lower middle section 124 of the plastic portion 112 by the first belt 132 in the direction of the arrow number 156, or by the second belt 138 on the housing 104 in the opposite direction to the arrow 156, it is stopped by the aforementioned coupling of the distant projection 152 with the teeth 126. To explain in detail, the stretching of the weighting belt 102 does not occur since the plastic portion 112 does not it is elastic; therefore, neither is stretched to any significant amount, and the elastic portion 110 is fixed at one end to the housing 104 and the other end to the aforementioned coupling between the distant projection 152 and the teeth 126. However, it should be noted that if the elastic portion 110 was in tension before engagement between the distant projection 152 and the teeth 126, the unidirectional nature of the teeth 126 allows the weighting belt 102 to contract, i.e., at least one portion of the elastic portion 110 and the plastic portion 112 will move in the direction opposite the number 156 arrow, toward the fixed projection portion 120. In this way, the elastic properties of the plastic portion 110 contract the weighting belt 102 until the elastic portion 110 is no longer stretched, thereby constituting a "non-stretched" mode of the weight measuring device 100. Referring now to Figure II, the trigger 108 is shown in a rotated position resulting from manipulation of the button that can be depressed, contrary to the normal deflection force, by a user of the weight measurement device 100. The button 146 that can be depressed moves the button portion 154 disposed at the end of the pawl 108 in the direction of the weighting belt 102. In this position, the distant projection 152 uncouples teeth 126, allowing stretching of the elastic portion 110 of the weighting strap 102, if there are forces exerted on the lower middle section 124 of the plastic portion 112 by the first strap 132 in the direction of the arrow with number 156, or by the second belt 138 on the housing 104 in the direction opposite to the arrow 156. During stretching, the plastic portion 112, which is not elastic, is not stretched to any significant amount; however, the elastic properties of the elastic portion 110 allow the stretching thereof. This stretching will allow a different portion of the elastic portion 110, comprising at least one of the numbers 128, to be disposed below the viewing window 148. Therefore, a user can visualize the numbers 128 by means of the magnifying glass 148 and thus, upon knowing the relation between the numerical value shown and the amount of stretching force required to visualize such number, estimate the magnitude of force and / or weighting the stretching of the weight measurement device 100. This measuring position, therefore, constitutes the "stretched" mode of the weight measuring device 100. The user then releases the button 146 that can be depressed, which allows the trigger 108 to pivot back to its normal position and the distant projection 152 to reattach the teeth 126, returning the weight measuring device 100 to the position not stretched. It should be noted that the unstretched position improves the calibration duration of the weighting belt / force resistance element 102, since it reduces the amount of time the elastic portion 110 is stretched. Such stretching only occurs during the measurement of the amount of force applied to the weight measuring device 100. In any case, the calibration of the scale of Weights can be revised and corrected. This may be recommended after prolonged use, when the stretchable element may have loosened slightly and become too elongated to show a false reading. A suitable calibration can, for example, be performed by comparing indications of the weight measuring device 100 against a known amount of weight attached to the first or second belt. Therefore, the numbers 128 can be corrected to reflect the displayed weight. In this way, the weight measuring device 100 will resume its accuracy. Turning now to Figure 1J, there is illustrated an example of the weight measuring device 100 removably attaching to an object in the form of a backpack 160, comprising a harness 162 configured to secure the backpack 160 to a user. The harness 162 comprises two shoulder belt assemblies 166 (only one of which can be seen in the partial view shown). Each shoulder strap assembly 166 comprises a lower strap 168, a first strap 132, a lower fastener 170, a weight measurement device 100, a second strap 138, a top strap 172 and a top fastener 174. The lower strap 168 extends between two ends, a first end 176 which is joined (for example, by stitching or otherwise) to a lower portion 178 of a bag portion 164 and a second portion 176. end 180 which engages the first belt 132 by the lower fastener 170. As described in previous figures, the weight measuring device 100 is joined between the first belt 132 and the second belt 138. The upper belt 172 extends between two ends, a first end 182 which is joined (for example, by sewing) or otherwise) to an upper portion 184 of the bag portion 164 and a second end 186 that engages the second belt 138 by the upper fastener 174. Both the lower fastener 170 and the upper fastener 174 comprise a pin 188, the arrangement of which facilitates, with the removal of the pin 188, the decoupling of the belts connected by the respective fastener. However, it should be noted that any fastener or device of a similar type that allows the coupling and uncoupling of the belts is suitable for this purpose. When the backpack 160 is worn or worn by a wearer, the weight load applied to each of the belt assemblies 166 can be measured or estimated by the user by the operation of the weight measurement device 100 described therein. It should be noted that that force applied to the weight measuring devices 100 in each of the shoulder strap assemblies 166 can be measured separately or simultaneously, allowing the option to measure the load carried by each shoulder strap assembly. Additionally, the load of each belt assembly and therefore the amount of force measured by the weight measuring devices 100 can be balanced through the elongation or shortening of the first belts 132 by the belt fasteners 136. In this example, the weight measuring device can be detachably removed from the backpack 160 by the lower fastener 170 and the upper fastener 174. This can be done, for example, when the backpack is placed on clothes to be washed. Turning now to 1K, the weight measuring device 100 can, alternatively, attach affixed to a harness 190 having a shoulder strap assembly 192 comprising only the elements shown in Figure 1E. In such a case, the first belt 132 extends between a lower portion 178 of the bag portion 164 and the engagement slit 130 of the weighting belt 102, and the second belt 138 extends between an upper portion 178 of the portion 164. of bag and joins the housing 104 as described in the above. Directing attention to Figures 2A to 21, an example of a weight measuring device generally designated at 200 having an integral equilibrium mechanism 202 (Figures 2B and 2D) is illustrated, eliminating, from this mode, the need for a belt fastener 136 (shown in relation to the previous embodiment) or similar external balancing mechanism. Focusing first on Figures 2B-2D, the balancing mechanism 202 comprises an outer belt 204, an inner belt 206 slidably disposed within the outer belt 204, a rotating toothed wheel 208 mounted on the inner belt, a spring and secure 210 rotatable mounted on the sprocket 208, and a rotary wheel 212 that couples the spring and lock 210 rotatable. In particular, the only differences between the weight measurement device 100 of the above embodiment and the weight measurement device 200 of the present embodiment are that the plastic portion 112 of the weighting belt 102 has been replaced by the outer strap 204 and an inner strap 206, and there has been the addition of elements related to the balancing mechanism 202, mainly four elements, the wheel 208 being rotatable toothed, a spring and latch 210 rotatable, a rotating wheel 212 and a sleeve element 230 (FIG. Figure 2A, which will be described further in the following). The outer strap 204 comprises a first end 214, a large slot 216, a first coupling opening 218 and a second end 220. The first end 214 engages the elastic portion (not shown) of the weight belt (not shown) in the same manner as the previous embodiment. The large slot 216 is designed to receive the inner strap 206 in a fixed manner. The opening 218 is for allowing the outer strap 204 to be coupled to another object, in the current example to a first strap 222 (Figure 2A). The inner belt 206 comprises a longitudinally oriented slot 224 having a row of teeth 226 along one of the longitudinal edges thereof, and a second coupling opening 228. The opening 228 allows the inner belt 206 to engage a jacket element 230, seen for example in Figures 2A and 2E. The sleeve element slides on the outer strap 204 and is present to prevent objects from separating the inner belt 206 and the outer belt 204. The rotary gear wheel 208 (FIG. 2C) comprises a bottom 232, a differential pinion 234 integrally formed in the bottom 232 having teeth adapted for coupling with the row of teeth 206 of the inner belt 226, and a flange 236 which it extends upwards and has an indented inner edge 238. In the assembled position, the bottom 232 of the rotary gear wheel 208 is aligned with the corresponding surfaces of the outer and inner belts 206 and 204, respectively.

The rotatable spring and latch 210 are adapted to sit within the rim 236 of the rotating toothed wheel 208 and comprise (Figure 2B) a lower portion 240, an upper portion 242, a curved slot 244, a hook shaped slot 246, upper annular protrusion 248, a lateral edge 250 and a lateral protrusion 252. The rotary wheel 212 comprises an upper surface 254, a tightening edge 256, a central opening 257 adapted to receive the annular protrusion 248 of the rotary spring and latch 210. The rotating wheel 212 is further formed with a lower surface 258, a first cylindrical protrusion 264 adapted to be received within the curved slot 244 of the rotatable spring and latch 210, and a second cylindrical protrusion 262 adapted to be incorporated within the slot 246 in the form of hook of the dock and secure 210 rotating. In Figures 2E-2H internal views of the assembled mechanism are shown. As can be seen, the upper surface 254 of the rotating wheel 212 is partially integrated into a second belt 266 to which the weight measuring device 200 is attached, but still capable of a rotary movement within the second belt 266. The tightening edge 256 has a non-smooth surface and protrudes outward from the sides of the second strap 266, as best seen in Figure 21. In the assembled position, the rotating wheel 212 engages the rotating spring and lock 210 by the following connection points: The central opening 256 couples the annular boss 248, the first cylindrical boss 264 it is inserted into the curved slot 244 and the second protrusion 262 is inserted into the hook-shaped slot 246; the spring and lock 210 rotate within the rotary toothed wheel 208 and rotate therewith as the side protrusion 252 engages the inner lip 238 dented. In particular, this only occurs when the rotating wheel 212 is rotated in one direction. The rotary gear wheel 208 is mounted on the inner belt 206 by the differential pinion 234 which engages the row of teeth 226 thereon; the rotation of the differential pinion 234 causes the teeth thereof to engage with the row of teeth 226 of the inner belt 206. In operation: A user can shorten the distance between the first belt 222 and the second belt 266 by rotating the rotating wheel 212 counterclockwise with his fingers. The rotation of the rotating wheel 212 moves the second cylindrical protrusion 262 towards the end portion of the hook-shaped slot 246, extending the hook-shaped slot and causing, Accordingly, the lateral protrusion 252 engages the inner bent edge 238 of the rotatable gear wheel 208, which rotates accordingly. In this way, the pinion 234 disengages the inner belt 206, causing the first belt 222 and the second belt 266 to contract together. In this way, the length of the straps can be adjusted and balanced. Additionally, the second cylindrical protrusion 262 remains in the end portion of the hook-shaped slot 246, causing the first belt 222 and the second belt 266 to lock in the adjusted position. In particular, if the rotary wheel 212 is rotated in a clockwise direction, the first cylindrical boss 264 contacts one of the edges of the curved slot 244 of the rotatable spring and lock 210, and the second cylindrical boss 262 removes from the end portion of the hook-shaped slot 246, causing the rotatable spring and latch 210 to disengage from the rotating toothed wheel 208, and consequently the first strap 222 disengages from the second strap 266, facilitating this the right conditions for the measurement of weight. It should also be noted that no other component rotates, in this case, since the lateral protrusion 252 does not engage the inner bent edge 238 of the rotary gear wheel 208.

As in the previous embodiment, the weight measuring device 200 can measure the amount of force applied to it by a user manipulating a button 268 that can be depressed, identical. The only difference is in relation to the balance mechanism 202, which, in an unlocked position, allows the inner belt 204 and the outer belt 206 to move, facilitating the measurement of the force magnitude applied to the measuring device 200. weight. Referring now to Figures 3A to 3M, a further example of the weight measurement device 300 is illustrated. It should be noted that the weight measurement device 300 is similar to the previous example described, in that it is capable of being incorporated into a shoulder strap assembly of a backpack (not shown) and comprises a force resistance element in the form of a elastic portion 390 connected to the shoulder strap assembly and adapted to measure the weight load thereof, and further comprises an integral balance mechanism for lengthening or shortening the belt assembly. Turning first to Figures 3A to 3C, there is a shoulder strap assembly 302 with a weight measurement device 300 incorporated therein. The shoulder strap assembly 302 comprises a lower strap 304 and a upper strap 306. The belt 304 lower extends between two ends, one end of which is attached to a lower portion of a backpack (not shown) and a second end 308 adapted to attach the weight measuring device 300 by a portion 310 of attached connecting strap. to the second end 308. The upper strap 306 has two ends, one end of which is attached to an upper portion of the backpack (not shown) and a second end 312 adapted to attach the weight measuring device 300 via a cavity 314 (Figure 3C) formed in the upper belt 306. The cavity 314 can be part of the original manufacture of the backpack or a normal belt can be modified to form the cavity 314. The weight measuring device 300 comprises a lower housing 316 implanted in the upper belt 306 and partially disposed within the cavity 314, a weighting strap 318 partially disposed within the lower housing 316 and the cavity 314, an equilibrium belt 320 partially disposed within the lower housing 316 and engaging the lower belt 304 and the weighting belt 318, a pin 322 mounted in the lower housing 316, a ratchet mechanism 324 in the form of a trigger that is pivotally mounted to the pin 322, a D-shaped strap that shortens the lever 326 pivotally mounted in the lower housing 316, a wheel 328 toothed mounted on lever 326 and adapted to couple the balance belt 320, a serrated guard 330 mounted on lever 326 and rigidly connected to gear wheel 328 and adapted to couple weighting belt 318 through an aperture 432 formed in balance belt 320, a button 332 of belt extension (Figure 3B) projecting in and secured to the lower housing 316 and adapted to engage the balance belt 320, and an upper housing 334 press-fitted to the lower housing 316 and fitted with a button 466 adapted to engage the trigger 324. The weight measurement device 300 will now be described in greater detail. Referring now also to Figures 3D-3F, the lower housing 316 comprises a housing portion 336 and a sleeve portion 338. The housing portion 336 comprises a bottom 340, a rim 342 extending along a peripheral portion of the bottom 340, a chamber 344 disposed in a central portion of the bottom 340 and a C-shaped rim 346 extending from a peripheral portion of the bottom 340. The edge 342 is formed with receptacles 348 and openings 350 for implantation. The receptacles 348 are adapted to receive projections (not shown) formed inside the upper housing 334 for connection thereof to the lower housing 316. Openings 350 for implantation they are used for thread insertion therethrough to allow implantation of the lower housing 316 in the upper belt 306. The chamber 344 comprises a transversely oriented wall 352, a first longitudinally oriented wall 354 extending from one corner of the wall 352 oriented transversely and a second wall 356 oriented longitudinally extending from the other corner of the wall 352 oriented transversely, each of which projects from the bottom 340. It should be mentioned that the first and second longitudinal walls, numbered 354 and 356, respectively, are sufficiently separated to incorporate at least one portion of the weighting strap 318, balance strap 320 and trigger 324 therebetween. The transverse wall 352 has a first transverse groove 358 formed therein (Figure 3E), adapted for sliding insertion of a portion of the weighting belt 318 therethrough. The first longitudinal wall 354 has a rectangular cutout 360 (FIG. 3E) formed therein, which is adapted for slidable insertion of a portion of the strap extension button 332 therethrough, and an O-shaped flange 362. formed on it, which is adapted to receive the pin 322. The second longitudinal wall 356 has an O-shaped flange 364 formed in the same, which is adapted to receive the pin 322. It should be noted that the C-shaped flange 346 is formed integral with the two receptacles 348 mentioned in the foregoing, one of which in particular has a recess 366 below it and therefore it does not extend to the bottom 340 for which purpose it will be described in the following. Additionally, the C-shaped flange 346 comprises a second transverse groove 368 (better seen in Figure 3B) formed in a central portion of the flange 346, a pair of concentric openings 370 formed therein and disposed between the transverse groove 368 and connecting the receptacles 348, a support seat 372 that will be described later, and a longitudinal slot 374 formed adjacent the recess 366. The sleeve portion 338 comprises a bottom portion 376 (Figure 3C) extending to the bottom 340 of the lower housing 316, opposite longitudinally oriented side wall portions 378 extending upwardly from the bottom portion 376, an end wall portion 380 extending upwardly from the bottom portion 376 and extending between the side wall portions 378, and a flange portion 382 that can be removably incorporated into the side walls 378 and wall portion 380 extreme (in this case by fasteners 384) and that engages the edge 342. The end wall portion 380 has a third transverse slot 386 (Figure 3C) formed therein. There is also a fourth transverse groove 388 formed by the connection areas of the bottom portion 376, sidewall portions 378 and flange portion 382. Turning now to Figures 3C, 3G and 31, the weighting strap 318 comprises a force resistance element 390 in the form of an elastic portion, and a plastic portion 392. Elastic portion 390 comprises an upper end 394, an intermediate portion 396 and a lower end 398. The upper end 394 comprises a protruding portion 400 which, when the weight measuring device 300 is assembled and consequently the weighting strap 318 is inserted through the sleeve portion 338, is disposed on the outside of the third groove 386 (Figure 3C), and is thicker than slot 386 to avoid traversing through it. The intermediate portion 396 is thinner than the protruding portion 400, and when the elastic portion 390 is inserted through the sleeve 338, the intermediate portion 396 extends through the third and fourth transverse grooves with number 386 and 388, respectively , without fastening accordingly due to reasons that will become apparent later. The plastic portion 392 comprises a section 402 upper half formed integrally with the lower end 398 of the elastic portion 390 (integrated through a manufacturing process or later articulated), and a lower middle section 404. Additionally, each of the sections of the plastic portion 392 identified in the above has a lower face (not shown), and an upper face 406. The upper face 406 of the upper middle section 402 comprises a narrow column 408 of inclined, unidirectional teeth, disposed along one side thereof and a series of ascending numbers 410, for indication of the weight measurement, adjacent to the teeth 408. The upper face 406 of the lower middle section 404 comprises a narrow column of separate 412 square teeth (best seen in Figure 3J) disposed along one side thereof and a wide column of 414 inclined, unidirectional teeth. , adjacent to the teeth 412 squares. It should be noted that when the weight measuring device 300 is assembled, the weighting belt 318 is inserted into the lower housing 316 by the first, second, third and fourth transverse grooves, with numbers 358, 368, 386 and 388, respectively, and is fixed by the portion 400 projecting to the outside of the third transverse groove 386 (Figure 3C), which, in particular, is the only transverse groove that prevents movement longitudinal of the weighting belt 318. After insertion of the weighting strap 318 into the lower housing 316, the sleeve portion 338 is inserted into the cavity 314 and the lower housing 316 is implanted in the upper belt 306 by the openings 350 for implantation. As seen in Figures 3A, 3G and 3J, the balance belt 320 comprises a first edge 416, a second edge 418, a lower edge 420, an upper edge 422, a lower face 424 and an upper face 426. The lower end 420 has a rectangular engaging slit 428 adapted for insertion of the connecting strap portion 310 therethrough. In this way, the connecting strap portion 310 is threaded through the rectangular groove and fastened to the lower belt 304, in this example, by Velero ™ (not shown). However, it should be noted that any fastener can be used to connect the connecting strap portion 310 to the lower belt 304. The upper end 422 comprises a return element 430 in the form of an integral, D-shaped elastic portion, which extends along the first edge 416. The D-shaped portion 430 comprises a D-shaped groove 432 formed in the same. The lower face 424 comprises a wide column of inclined, unidirectional teeth 434, adapted for locking engagement in a single direction with the wide column of the inclined teeth 414 on the upper face 406 of the plastic portion 392 of the weighting belt 318 (best seen in Figure 31). The upper face 426 comprises a narrow column of inclined teeth 436, formed along the first edge 416 of the balance belt 320, and a push rod 438 formed on and extending along the second edge 418 of the belt. 320 of balance. During assembly, the balance belt 320 is inserted into the second transverse groove 368 of the lower housing 316 and is disposed on and engages the weighting belt 318. Referring now to Figure 3H the trigger 324 is disposed within the chamber 344 (Figures 3D-3F) and comprises a slot 440 adapted for the insertion of the pin 322, a pointed distant projection 442 adapted for coupling with the teeth of the narrow column of 436 inclined, unidirectional teeth, in the plastic portion 392, and a button portion 444 disposed at the end of the trigger 324 that does not comprise the distant projection 422. During assembly, the pin 322 is inserted through the tabs 363 and 364 in the form of 0 (Figure 3E) and the slot 440 in the trigger 324 to allow the rotation of the trigger 324. The D-shaped strap that shortens the 326 lever it is mounted pivotably in the lower housing 316 and comprises a curved tightening portion 446 and a straight portion 448. Referring now also to Figures 3D-3F, during assembly, the straight portion 448 is inserted into the lower housing 316 by the pair of concentric apertures 370 formed in the flange 374 thereof and the curved portion 446 is attached to the portion 448 straight. Turning now to Figure 3J, the toothed wheel 328 is mounted on the lever 326 by a central opening (not shown) formed therein, and comprises teeth 450 which are adapted to engage the narrow column of inclined teeth 436 of the belt 320 of balancing and pressing the balance strap 320 against the weighting strap 318 for locking engagement, and a moon-shaped side projection 452 for receiving the straight portion 448 of the lever 326. The tooth lock 330 comprises a rectangular slot 454 and a 456 projection of teeth in a square shape. The rectangular slot 454 is adapted for a tight fitting insertion of the moon-shaped projection 452 when the straight lever portion 448 is received therein. The 456 projection of square shaped teeth is adapted to fit within the narrow column of 412 square teeth, when rotated to an appropriate angle (see Figure 3K). The tight fit mentioned above it facilitates rotation of both the toothed wheel 328 and the toothed safety 330 when the lever 326 is rotated. Additionally, with brief reference to Figure 3D, it should be noted that the supporting seat 372 of the lower housing 316 has recesses formed in an appropriate manner so that the lever 326, the toothed wheel 328 and the toothed safety 330 are placed on it, while still allowing rotation thereof. In addition, the projection 456 of square-shaped teeth projects at all times through the D-shaped slot 432, stopping the longitudinal movement of the belt 320 in any direction. Turning now to Figure 3L, the strap extension button 332 comprises a button portion 458, a neck portion 460 that can be attached to the button portion 458 and a base portion 462 extending from the portion 560 of neck. Referring now also to Figures 3D-3F, neck portion 460 is adapted for slidable movement within longitudinal slot 374 and recess 366 in lower housing 316. During assembly, the neck portion 460 is inserted through the longitudinal slot 374, such that the base portion 462 is in contact with the push rod 438, and the button portion 458 is then attached to the 460 neck portion. It should be noted that portion 458 of the button and the base portion 462 are larger than the longitudinal slot 374 to prevent the extension button 332 from coming out of them. Returning to Figure 3B, the upper housing 334, which is adapted to press fit the lower housing 316 and cover all the components disposed therebetween, comprises a viewing window 464, a button 466 and internal projections (not observed) . The viewing window is in the form of a magnifying lens disposed above the series of numbers 410 ascending in the weighting belt 318, allowing them to be read through it. The button 466 is disposed thereon and engages the button portion 444 of the trigger 324. As described above, the upper housing 334 further comprises internal (unobserved) projections formed therein for snap connection to the lower housing 316 by the receptacles 348 formed therein. As mentioned in the foregoing, the weight measuring device 300 also allows for balance control by lengthening or shortening the shoulder strap assembly 302 using elements that constitute an integral balance mechanism. In this example, the balance mechanism is comprised of all the elements, with the exception of the upper housing 334, without which equilibrium would not be possible. It should be noted that, since the example describes an integral equilibrium mechanism, some of the elements in this example have a double function; therefore, the specific elements that constitute the "balance mechanism" will not be highlighted as such to avoid confusion, because, in one state, one element can operate to provide a weight determination function and, in another, the same element can provide the balance function. However, the description of the equilibrium operation will clarify which components provide a weighting function and which provide an equilibrium function. In operation, the weight measuring device 300 provides a user with the ability to determine the weight load, elongate and shorten the shoulder strap assembly 302 to which it is incorporated and thereby balance the weight load between the shoulders. With respect to the determination of the weight load, it can be described that the weight measuring device 300 has an unstretched state and a stretched state. As seen in Figure 3G, the retainer of a 324 is normally offset, such that the distant projection 444 engages the teeth of the narrow column of tilted, unidirectional teeth 408 of the plastic portion 392 in a so-called "blocking action". This position normally deviated from the trigger 324 is referred to as the "unstretched state". Since the elastic portion 390 of the weighting belt 318 is fixed to the upper end 394, and the aforementioned blocking action stops the stretching movement of the lower end 398 of the elastic portion 390 by the plastic portion 392, the action of blocking essentially keeps the elastic portion 390 static. It is noted that the inclined teeth 408 to which the trigger 324 is connected are unidirectional; therefore, the blocking action only prevents the stretching movement of the elastic portion 390. In this way, when there is no stretching force on the elastic portion, the elasticity of the elastic portion 390 returns the weighting belt 318 to an unstretched state even during the blocking action. The unstretched state allows a prolonged calibration duration of the force resistance element by reducing the time the elastic portion 390 is stretched. To determine the weight load of the shoulder strap assembly 302, the assembly 302 is carried in such a way that a stretching force is applied to the weight measuring device 300 (not shown), for example when using the backpack (not shown) ) to which the assembly 302 is connected.

A user must then pull the button 316 which impacts the button portion 444 of the trigger 324 by rotating and uncoupling the projection 442 away from the inclined teeth 436 in the plastic portion 392 (Figure 3H). In this way, the elastic portion 390 is stretched due to the stretching force applied thereto by the lower belt 304 and the balancing belt 320 on one side, and the upper belt 306 to which it is fixed by the shirt 338 at the other, which constitutes the so-called stretched state (Figure 3H). In the stretched state, the user reads the appropriate number 410 that appears through the viewing window 464 to evaluate the weight load on the shoulder strap assembly 302. Then, the user releases the button 316 and the trigger 324 returns to its normally deviated position. When the stretching force is removed from the shoulder strap assembly 302, for example when the user places the backpack (unobserved) in the bottom (not observed), the elastic properties of the elastic portion 390 return the device 300 for measuring. weight to the so-called non-stretched state (Figure 3G), as described above. With reference to Figure 3J, to shorten the shoulder strap assembly 302, a user grasps the lever 326 in its normal position (as shown in FIG.

Figure 3J, i.e., extending it substantially parallel with the belts) and rotates the lever 326 in the direction of the arrow 468. Referring now to Figure 3K, the rotation results in the rotation of the toothed wheel 328 and the lock 330 teeth. The teeth 450 of the sprocket consequently push the inclined teeth 436 into the balance belt 320, which, as a result, slides on the plastic portion 392 of the weighting belt 318 and then attaches thereto, shortening, therefore, the shoulder strap assembly 302. Then, the user returns the lever 326 to its normal position, and can repeat the lever rotation for an additional shortening action. In particular, the return movement does not provide a return movement to the balance belt 320 due to the unidirectional nature of the inclined teeth 436 on the upper face 426 of the balance belt 320, the teeth 424 inclined on the lower face 424 of the balance belt 320 and the inclined teeth 414 in the plastic portion 392 of the weighting belt 318. Additionally, the rotation of the serrated latch 330 causes the square-shaped tooth 456 to engage the square teeth 412 of the plastic portion 392, stopping the movement of the weighting belt 318. In addition, square tooth 456 functions as a retainer Mechanical if it makes contact with the periphery of the D-shaped slot 432, preventing the balance belt 320 from getting too close to the lower housing 316. With reference to Figure 3L, to lengthen the shoulder strap assembly 302, the user presses the button portion 458 of the strap extension button 332 in the direction of the arrow 470. The base portion 462 pushes the bar 438 laterally push and move the balance belt 320 relative to the rest of the components of the weight measurement device 300, as shown in Figure 3M. Referring now to Figure 3M, in this position, the narrow column of tilted teeth 436 on balance belt 320 is not disposed directly under the teeth 450 of the gear wheel 328, as shown in previous drawings, and the portion 430 D-shaped elastic is compressed within the second transverse groove 368 (Figure 3B). If a stretching force is applied to the weight measuring device 300, the balance belt 320, which no longer presses against the weighting strap 318 for locking engagement, slides out of the lower housing 316. Similar to the previous shortening method, the square tooth 456 functions as a mechanical seal if it contacts the periphery of the groove 432 in the shape of D, preventing the balance belt 320 from leaving the lower housing 316. After the button 458 is released, the elastic D portion 430 spontaneously returns to its normal shape and urges the balance belt 320 back to the position shown in Figure 3L. In this position, the toothed wheel 328 again makes contact with the inclined teeth 436 in the balance belt 320, which again engages the weight belt in a locking manner. Those skilled in the art to which this invention pertains will readily appreciate that numerous changes, variations and modifications can be made without departing from the scope of the invention muta tis mutandis. For example, the device, according to the present invention, is also suitable as an 'independent' article, mainly suitable for a separate accessory article that can be detachably connected to any device.

Claims (23)

1. CLAIMS 1. A weight measuring device adapted to be joined between two objects to measure the force magnitude between them, characterized in that it comprises a force resistance element and a weight indicator that provides an indication of the amount of force applied thereto, the device adapted to put it in a stretched state when the force resistance element is altered by the application of forces by the two objects, and an unstretched state when the strength element is not altered by the application of forces through the two objects; and a visual indication that corresponds to the force applied. The weight measuring device according to claim 1, further characterized in that it comprises an equilibrium mechanism that is adapted to change the magnitude of force between the two objects. 3. The weight measuring device according to claim 2, characterized in that the balance mechanism is adapted to lengthen and / or shorten the distance between the two objects, thereby changing the magnitude of force between them. The weight measuring device according to claim 2, characterized in that the balance mechanism is an integral part of the device of weight measurement. The weight measuring device according to claim 1, characterized in that the force resistance element is a belt made of an elastic material. The weight measuring device according to claim 5, characterized in that the elastic material is made of natural rubber. The weight measuring device according to claim 1, characterized in that the weight indicator comprises a numerical scale associated with the force resistance element. The weight measuring device according to claim 1, characterized in that the weight measuring device further comprises a viewing window for displaying the weight indicator. The weight measuring device according to claim 8, characterized in that the viewing window is made of magnifying glass. The weight measuring device according to claim 1, characterized in that the two objects between which the weight measuring device is attached are two portions of a shoulder strap assembly of a harness. 11. The weight measurement device of according to any of the preceding claims, characterized in that it is detachably connected to any article for weight measurement. The weight measuring device according to claim 10, characterized in that the harness is part of a backpack or parachute or suitcase or a parachute apparatus. 13. A harness comprising a pair of shoulder strap assemblies, with each shoulder strap assembly including a weight measurement device that fits between two portions thereof, the weight measurement device characterized in that it comprises a weight measurement element. force resistance altered by the application of force to it, and a weight indicator that provides an indication of the amount of force applied to it; The weight measuring device is adapted to put it in a stretched state and in an unstretched state, such that when the weight measuring device is in the stretched state, the force resistance element is altered by the application of forces by the two portions of the shoulder strap assembly, and when the weight measuring device is in the unstretched state, the force resistance element is not altered by the application of forces by the two portions of the body assembly. shoulder strap, not stretched state therefore improves the calibration duration of the force resistance element. 14. The harness in accordance with the claim 13, further characterized in that it comprises an equilibrium mechanism that is adapted to change the magnitude of force between the two shoulder straps. 15. The harness in accordance with the claim 14, characterized in that the balance mechanism is adapted to lengthen and / or shorten the distance between the two shoulder straps, thereby changing the magnitude of force between them. The harness according to any of claims 14 or 15, characterized in that the balancing mechanism is an integral part of the weight measuring device. 17. The harness according to claim 13, characterized in that the force resistance element is a belt made of an elastic material. 18. The harness according to claim 17, characterized in that the elastic material is made of natural rubber. 19. The harness according to claim 13, characterized in that the weight indicator comprises a numerical scale associated with the force resistance element. 20. The harness according to claim 13, characterized in that the weight measuring device further comprises a viewing window for displaying the weight indicator. 21. The harness in accordance with the claim 20, characterized in that the viewing window is made of magnifying glass. 22. The harness according to any of claims 13-21, characterized in that the harness is part of a backpack or a parachute apparatus. The harness according to claim 13, characterized in that each of the shoulder strap assemblies includes two fasteners configured to disassemble the corresponding weight measuring device.