Personal Flotation Device Having Selectively Inflatable Bladders

Abstract

An improved structure for a personal floatation device that is relatively comfortable to wear when not in use includes a primary bladder that is shaped to extend about a waist of a user. The personal flotation device also includes a secondary bladder that is in fluid communication with the primary bladder and is shaped to extend upwardly from the waist across a stomach of the user. Lastly, the personal flotation device includes a tertiary bladder that is in fluid communication with the secondary bladder and is shaped to is adapted to across the front of a chest of the user.

Description

BACKGROUND OF THE INVENTION

This invention relates in general to personal flotation devices, commonly referred to as life vests or life jackets. In particular, this invention relates to an improved structure for such a personal floatation device that includes a belt-like structure containing a plurality of selectively inflatable bladders.

Personal floatation devices are well known in the art and are adapted to be worn by a user to keep the user afloat in a body of water to prevent drowning. To accomplish this, a typical personal flotation device supports or contains a material that is sufficiently buoyant in water as to keep the user afloat. A wide variety of personal flotation devices are known in the art for performing this general function.

Although known personal floatation devices have been successfully engineered to address the needs of users when floating in the water, it appears that little attention has been given to the design of such personal floatation devices when they are worn by users out of the water. On the contrary, many personal floatation devices are relatively uncomfortable to wear and significantly restrict the free movement of the arms and torso of the users wearing them. Consequently, many people simply do not wear their personal floatation devices when engaged in water activities until an emergency situation arises. Unfortunately, during such an emergency situation, it may be difficult to quickly locate and don the personal floatation device. Thus, it would be desirable to provide an improved structure for such a personal floatation device that is relatively comfortable to wear when not in use.

SUMMARY OF THE INVENTION

This invention relates to an improved structure for a personal floatation device that is relatively comfortable to wear when not in use. The personal flotation device includes a primary bladder that is shaped to extend about a waist of a user. The personal flotation device also includes a secondary bladder that is in fluid communication with the primary bladder and is shaped to extend upwardly from the waist across a stomach of the user. Lastly, the personal flotation device includes a tertiary bladder that is in fluid communication with the secondary bladder and is shaped to is adapted to across the front of a chest of the user.

Various aspects of this invention will become apparent to those skilled in the art from the following detailed description of the preferred embodiment, when read in light of the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front elevational view of a personal floatation device supported on a user in accordance with this invention, wherein the personal floatation device is shown in a deflated condition.

FIG. 2 is a side elevational view of the personal floatation device and user illustrated in FIG. 1.

FIG. 3 is a front elevational view of the personal floatation device and user illustrated in FIGS. 1 and 2, wherein the personal floatation device is shown in an inflated condition.

FIG. 4 is a side elevational view of the personal floatation device and user illustrated in FIG. 3.

FIG. 5 is a perspective view of the personal floatation device illustrated in FIGS. 1 through 4 shown in an inflated condition.

FIG. 6 is a top plan view of the personal floatation device illustrated in FIGS. 1 through 5 shown in a deflated condition.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring now to the drawings, there is illustrated in FIGS. 1 though 6 a personal floatation device (PFD) in accordance with this invention. FIGS. 1, 2, and 6 illustrate the PFD in a deflated condition, while FIGS. 3, 4, and 5 illustrate the PFD in an inflated condition. As will be explained in detail below, the PFD is adapted to be worn around the waist of the user as shown in FIGS. 1 and 2 when in a deflated condition. When so worn, the PFD is relatively comfortable and unobtrusive for the user to wear. However, in an emergency situation, the PFD can be quickly and easily actuated into an inflated condition as shown in FIGS. 3 and 4.

The PFD may be enclosed within a pouch 1 that is preferably formed from a flexible, fabric material, but can be formed from any desired material. This pouch 1 functions as a protective enclosure for the other components of the PFD when the PFD is not inflated. The pouch 1 may be annular in shape such that it can be supported on a waist of the user in the nature of a belt, as shown in FIGS. 1 through 4. If desired, the pouch 1 may be attached to an inner belt 1a (see FIG. 5) that also is adapted to extend around the waist of the user. The belt 1a can be formed from any desired material, but preferably is formed from a flexible, fabric material that is sufficiently strong to support the weight of the user on the PFD during use when inflated. Also, one or more buckles and/or tightening mechanisms 4 may be provided on or in connection with the belt 1a to facilitate the installation of the PDF on the user. In the illustrated embodiment, these buckles and/or tightening mechanisms 4 are located at the rear of the user, although such is not required. Additional body attachment structures, such as the torso straps and leg straps respectively shown at 5a and 5b, may optionally be provided.

The pouch 1 has one or more openings formed therethrough that allow an activation pull cord 2 to extend therethrough from the interior of the pouch 1 to the exterior thereof, where it can be easily accessed by the user. Within the pouch 1, one or more of gas cylinders, manual and/or automatic inflation devices, and arm and/or unarmed visual gauges 3 may be provided. The gas cylinders are conventional in the art and are adapted to contain a quantity of compressed air or other gas. When the activation pull cord 2 is pulled by the user, the gas cylinders are adapted to release such pressurized gas in the manner described below to actuate the PFD from its deflated condition to its inflated condition.

In FIGS. 1, 2, and 6, the PFD is shown in its deflated condition. In order to inflate the PFD, the user pulls on the activation pull cord 2. In response thereto, one or more of the gas cylinders and/or automatic inflation devices are actuated to release the pressurized gas therein through an inlet manifold into primary and secondary bladders 7 and 9, respectively, that are also contained within the pouch 1 when the PFD is in its deflated condition. As a result, the primary and secondary bladders 7 and 9 are expanded within the pouch 1. When the volume of either or both of the primary and secondary bladders 7 and 9 exceeds the available space within the pouch 1, the pouch 1 will split open along a seam 6 so as to allow the primary and secondary bladders 7 and 9 to expand outwardly therefrom, as shown in FIGS. 3, 4, and 5.

The primary bladder 7 may be provided with several chambers, all of which are preferably constructed from one continuous piece of fabric (although such is not required). The primary bladder 7 is the main attachment of integrated bladder system to the belt, which is then attached to the user. As shown in the drawings, the primary bladder 7 is adapted to extend about the waist of the user. To accomplish this, the primary bladder 7 may be formed in the shape of a complete annulus (in which case, the buckles 4 for the belt are not needed) or in the shape of a split annulus having first and second ends that are disposed adjacent to one another when the PFD is inflated. Regardless, it is desirable (but nor required) that the primary bladder 7 inflate first when the activation pull cord 2 is operated by the user.

As best shown in FIGS. 5 and 6, the illustrated secondary bladder 9 includes a lower portion 9a, an intermediate portion 9b, and an upper portion 9c. The lower portion 9a of the secondary bladder 9 is generally annular in shape and is adapted to extend about the waist of the user adjacent to the primary bladder 7. The intermediate portion 9b of the secondary bladder 9 is generally shaped as a flat panel and is adapted to extend upwardly from the waist across the stomach of the user. The upper portion 9c of the secondary bladder 9 is also generally annular in shape and is adapted to extend about the mid to upper torso portions of the user.

After the primary bladder 7 is sufficiently full, the compressed air passes through one or more restriction points 7a (see FIG. 6) into the secondary air bladder 9. The secondary bladder 9 is adapted to provide support under the arms of the user, as shown in FIGS. 3 and 4. The pneumatic pressure between the primary and secondary bladders 7 and 9 will cause such bladders 7 and 9 to “spring” open quickly, which may be important in an emergency situation. Pneumatic pressure develops a tensile condition of the fabric on outside edge, causing movement of the secondary bladder 9 until either the arms of the user impinge movement or fabric tensions equalize on both sides.

The PFD also includes a tertiary bladder 10 that is located at the front of the upper portion 9c of the PFD. The tertiary bladder 10 communicates with the upper portion 9c of the secondary bladder 9 through one or more restriction points 10a (see FIG. 6). The tertiary bladder 10 is adapted to provide support for the front of the chest of the user, as shown in FIGS. 3 and 4. If desired, an oral inflation tube 11 may be provided on the tertiary bladder 10 to allow the user to manually inflate the PFD if necessary.

The PFD further includes a head support bladder 13 that is located at the rear of the upper portion 9c of the secondary bladder 9 of the PFD. The head support bladder 13 communicates with the upper portion 9c of the secondary bladder 9 through one or more restriction points 13a (see FIG. 6). The head support bladder 13 is adapted to provide support for the rear of the head of the user, as shown in FIGS. 3 and 4. One or more bladder placement straps 23 may be provided to maintain proper relative positioning of the various bladders when the PFD is in the inflated condition.

The principle and mode of operation of this invention have been explained and illustrated in its preferred embodiment. However, it must be understood that this invention may be practiced otherwise than as specifically explained and illustrated without departing from its spirit or scope.

Claims

1. A personal flotation device comprising: a primary bladder that is shaped to extend about a waist of a user;a secondary bladder that is in fluid communication with the primary bladder and is shaped to extend upwardly from the waist across a stomach of the user; anda tertiary bladder that is in fluid communication with the secondary bladder and is shaped to is adapted to across the front of a chest of the user.

2. The personal flotation device defined in claim 1 wherein the secondary bladder includes a lower portion, an intermediate portion, and an upper portion.

3. The personal flotation device defined in claim 2 wherein the lower portion of the secondary bladder is generally annular in shape and is adapted to extend about the waist of the user adjacent to the primary bladder.

4. The personal flotation device defined in claim 3 wherein the intermediate portion of the secondary bladder is generally shaped as a flat panel and is adapted to extend upwardly from the waist across the stomach of the user.

5. The personal flotation device defined in claim 4 wherein the upper portion of the secondary bladder is also generally annular in shape and is adapted to extend about the mid to upper torso portions of the user.

6. The personal flotation device defined in claim 1 wherein the secondary bladder communicates with the primary bladder through one or more restriction points.

7. The personal flotation device defined in claim 1 wherein the tertiary bladder communicates with the secondary bladder through one or more restriction points.

8. The personal flotation device defined in claim 1 wherein the secondary bladder communicates with the primary bladder through one or more restriction points, and wherein the tertiary bladder communicates with the secondary bladder through one or more restriction points.

9. The personal flotation device defined in claim 1 further including a head support bladder that is in fluid communication with the secondary bladder.

10. The personal flotation device defined in claim 1 wherein the head support bladder is located at a rear of the upper portion of the secondary bladder.

11. The personal flotation device defined in claim 10 wherein the head support bladder communicates with the secondary bladder through one or more restriction points.

12. The personal flotation device defined in claim 1 further including one or more gas cylinders containing pressurized gas and are adapted to selectively release the pressurized gas into the primary bladder.

13. The personal flotation device defined in claim 12 further including an activation pull cord that is operable by the user to release the pressurized gas into the primary bladder.