Combination ambulance cot and chair

[0001] The present invention relates to a combination ambulance cot and chair used to load patients into the back of an ambulance.

[0002] In transporting emergency patients from their homes to a hospital for treatment, it is oftentimes necessary to remove the patient from his home using an ambulance cot, such as a stretcher, or the like, wherein the patient is situated thereon in a generally supine position. As well known in the art, such cots are typically provided with an undercarriage having a rollable base which facilitates transportation of the patient situated upon the cot to an ambulance parked near the patient's home. The undercarriage may be collapsed, thereby permitting the cot, its undercarriage, and the patient situated thereon to be rolled into the back of the ambulance in a fully-reclined position for transportation to the hospital.

[0003] However, in removing the patient from his home, it is sometimes difficult for paramedics to reach the patient with a fully-reclined cot, such as those of the prior art. Particularly, it is difficult for paramedics to traverse stairs to/from a second floor of the patient's home with a fully-reclined cot, or where the patient's home includes narrow hallways and doorways, through which maneuvering of a fully-reclined cot is extremely difficult, and sometime, impossible. In such situations, it is desirable for the cot to have a reduced “footprint,” such as that provided by a wheelchair or the like, to facilitate maneuvering of the cot and of a patient situated thereon through the patient's home. Once the cot has been removed to a location free from any obstructions of the patient's home, such as, to a location near the back of the ambulance, it is desirable for the cot to be fully-reclining to facilitate rolling the cot into the back of an ambulance.

[0004] Accordingly, there is a continued need to provide a combination ambulance cot and chair which is movable between a fully-reclined position, where a patient situated thereon is resting in a generally supine position, and a chair position, where a patient situated thereon is in a generally upright, sitting position. In addition, it has been observed that prior art combination ambulance cot and chairs do not easily transition from the chair position to the fully-reclined position. Due to the typically provided ratcheting mechanism on such prior art cots, paramedics must pull up and then lower the cot into its reclined position. This lowering operation with these prior art cots is jarring which can add further discomfort to the patient. Accordingly, there is also a need to provide a combination ambulance cot and chair which transitions smoothly between the chair position and the fully-reclined position.

[0005] It is against the above back ground that the present invention provides a combination ambulance cot and chair used to load a patient into the back of an ambulance. The cot of the present invention is movable between a fully-reclined position, wherein a patient situated thereon is in a generally supine position, and a chair position, wherein the patient situated thereon is generally upright in a seated position thereby providing a cot with a reduced footprint.

[0006] Additionally, the cot of the present invention includes folding legs pivotally mounting a support frame to a wheeled base. A segmented patient support is adjustably connected to the support frame and includes a back segment, a leg segment, and seat segment. The back segment is pivotably connected at one end thereof to the support frame, and is inclinable to a plurality of positions. The seat segment is pivotably connected to the support frame at both ends. The leg segment is pivotably connected to the seat segment and the support frame. Accordingly, with the patient support segments interconnected as such, the seat and leg segments move in unison with the cot support frame from the chair position to the fully-reclined position.

[0007] In one embodiment, a combination ambulance cot and chair is disclosed. The combination ambulance cot and chair comprises a support frame, and a segmented patient support pivotally mounted to the support frame for movement at least between a chair position and a fully-reclined position. The segmented patient support has a seat segment. A securing device is connected functionally to the support frame and the seat segment, and is configured to releasably secure the combination ambulance cot and chair in at least the fully-reclined position.

[0008] In another embodiment, a combination ambulance cot and chair comprising a support frame, and a segmented patient support pivotally mounted to the support frame for movement at least between a chair position and a fully-reclined position is disclosed. The segmented patient support has a seat segment and a leg segment pivotably attached to the seat segment. A securing device has a pivot member fixed to the seat segment, the pivot member being releasably locatable in at least the fully-reclined position. A wheeled base and legs, each having a first end pivotably attached to the support frame and a second end attached to the wheeled base, are also provided. The combination cot and chair is selectively positionable in either a raised position which situates the legs substantially perpendicular to the seat segment, and a lowered position which situates at least two of the legs folded adjacent the seat segment.

[0009] In another embodiment, a combination ambulance cot and chair comprising a support frame, and a segmented patient support pivotally mounted to the support frame for movement at least between a chair position and a fully-reclined position is disclosed. The segmented patient support has a seat segment, a leg segment pivotably attached to the seat segment, and a back segment pivotably attached to the support frame. A securing device having a pin and a pivot member providing a plurality of pin catches each sized to accommodate at least a portion of the pin is also provided. The seat segment is fixed to the pivot member, and the pin is movably between the catches, whereby when the pin is accommodated in a first one of the pin catches, the combination ambulance cot and chair is releasably secured in the fully-reclined position, and when the pin is accommodated in a second one of the pin catches, the combination ambulance cot and chair is releasably secured in the chair position. A wheeled base and legs, each having a first end pivotably attached to the support frame and a second end attached to the wheeled base, are provided. The combination cot and chair is selectively positionable in either a raised position which situates the legs substantially perpendicular to the seat segment, and a lowered position which situates at least two of the legs folded adjacent the seat segment.

[0010] These and additional objects, features and advantages of the present invention will become apparent to those reasonably skilled in the art from the description which follows, and may be realized by means of the instrumentalities and combinations particularly pointed out in the claims appended hereto.

[0011] A better understanding of the present invention will be had upon reference to the following description in conjunction with the accompanying drawings in which like reference numerals represent like parts, and wherein:

[0012] FIG. 1 is a front side perspective view of a combination ambulance cot and chair according to an embodiment of the present invention, showing the cot in a chair position, and with some parts sectioned away for ease of illustration;

[0013] FIG. 2 is a side view of the combination ambulance cot and chair of FIG. 1;

[0014] FIG. 3 is a side view of the combination ambulance cot and chair of FIG. 1, showing the cot in a fully-reclined raised position, with the legs and wheeled base also shown in dashed lines to indicated the combination ambulance cot and chair being positionable in a lowered position.

[0015] FIG. 4 is a perspective view of a bracket and a securing device of the combination ambulance cot and chair of FIG. 1 according to the present invention.

[0016] With reference to FIGS. 1-4, according to an embodiment of the present invention a combination ambulance cot and chair 10 is shown. The combination ambulance cot and chair 10 (herein referred to as cot 10) includes legs 20 supportably connecting a wheeled base, generally indicated as symbol 30 to a support frame, generally indicated as symbol 40. Wheeled base 30 includes a generally rectangular frame having members 32, connected in an end-to-end fashion, and wheels 34 attached to respective frame members 32 at their ends of intersection. In the illustrated embodiment, the front wheels 34a are swivel castors to facilitate steering and maneuvering of cot 10, whereas the rear wheels 34b are fixedly mounted to the respective frame members 32.

[0017] The support frame 40 is generally rectangular in shape and comprises a pair of side arm members 42, a pair of upper frame members 44, a lower frame members 46, and upper and lower crossbars 48 and 50, which are best seen in FIG. 1. Each side arm member 42 is pivotably attached at one end to a respective one of the upper frame members 44 and to the lower frame member 46 adjacent the other end. At the ends remote from the ends attached to the upper frame members 44, the side arm members 42 are pivotably attached to a first pair of the legs 20a. A second par of the legs 20b are pivotably attached to the lower crossbar 50. Upper crossbar 48 is fixedly secured between the pair of upper frame members 44. Accordingly, legs 20a, 20b are pivotally mounted to the support frame 40 and the wheeled base 30 such that the legs may swing the wheeled base generally parallel to the support frame.

[0018] A pair of loading wheels 52 are rotatably mounted to ends of the upper frame members 44. As best seen in FIG. 3, each upper frame member 44 is slightly bent such that the loading wheels 52 are below the side arm members 42 when the cot is place in the fully-reclined raised position. This is to help facilitate loading of the cot chair onto a support surface 54, such as provided by a transport bay of an emergency vehicle.

[0019] A pair of braces, generally indicated by symbol 56, is pivotally mounted diagonally to the support frame 40 and the wheeled base 30. In the raised position of the cot 10, illustrated by FIGS. 1-3, the pair of braces 56 releasably secures the legs 20a, 20b perpendicularly to the side arm members 42 via a releasably catch 58. In the raised position, the support frame 40 is positionable in either a chair position such as illustrated by FIG. 1 and 2, or a fully-reclined position which is illustrated by FIG. 3.

[0020] Each of the braces 56 have upper and lower links 60a and 60b, respectively, connected by an over-center hinge 62. Since each lower link 60b is pivotally mounted to the wheeled base 30 and each upper link 60a is pivotally mounted to the support frame 40, breaking the over-center hinge 62 in the direction of the arrow 64 will permit the wheel base 30 to swing relative to the support frame 40 in the direction of arrow 66, thereby placing the cot 10 in a lowered position, which is illustrated by the dashed lines in FIG. 3. In the lowered position, the second pair of legs 20b are folded adjacent side arm members 42 below a seat segment 68 of a segmented patient support.

[0021] Cot 10 further includes the segmented patient support, generally indicated by 70, which is also adjustable between the chair position, such as shown in FIG. 1, and the fully-reclined position, such as shown in FIG. 3. The segmented patient support 70 comprises three main segments namely, a back segment 72, the seat segment 68, and a leg segment 74. The back segment 72 is generally u-shaped and is pivotably connected at a lower end between a pair of brackets 76. The back segment 72 is also mounted at an upper end to a lift cylinder 78 and thus may be releaseably positioned in a plurality of locations between a fully-reclined position as shown in FIG. 3, and an upright position which is indicated by the dashed line. The other end of the lift cylinder 78 is rotatably attached to a cross member 80. The cross member 80 is mounted also between the pair of brackets 76, and mount a second pair of loading wheels 82, which is best seen by FIG. 1.

[0022] A footrest 84 is pivotably attached adjacent a distal end between the lower frame member 46 and at a proximate end to the leg segment 74. The leg segment 74 is further pivotably attached to the seat segment 68 adjacent a distal end thereof. The distal end of the seat segment 68 is pivotably attached between the lower frame member 46. A proximate end of the seat segment 68 is pivotably attached between the pair of brackets 76.

[0023] In addition to the pair of brackets 76, a pair of linkages 86 is further provided to the support frame 40. Each of the linkages 86 is rotatably attached to the lower frame member 46 at a first end and to a respective one of the brackets 76 at a second end. Each bracket 76 is mounted to a respective one of said upper frame members 44. In this manner, as the upper frame members 44 are transitioned from the chair position shown in FIG. 1, to the fully-reclined position shown in FIG. 3, the brackets 76 will push the linkages 86, lifting the lower frame member 46, and the seat segments 68, leg segments 74, and footrest 84 connected thereto, into the fully-reclined position.

[0024] A securing device is connected functionally to the support frame 40 and the seat segment 68, and configured to releasably secure the cot 10 in at least the fully-reclined position. FIG. 4 shows one of the brackets 76, which provides in one embodiment the securing device, generally indicated by symbol 88, between first and second bracket members 90a, 90b. The same type of securing device 88 may also be provided to both brackets 76 in another embodiment.

[0025] The securing device 88 includes a locking member 92 which releasably engages a keeper 96. In the illustrated embodiment the locking member 92 is a pin, but in other embodiments may be for example, a dog, a pawl, a level, a claw, a hook, etc., and the keeper 96 is a plurality of pin catches, but in other embodiments may be for example, ratchets, notches, recesses, holes, a cam, etc. Additionally, in the illustrated embodiment the locking member is provided to bracket member 90a, and the keeper 96 is provided to a pivot member 94, but in other embodiments relative positions may be reversed, so long as the relative motion between the bracket members 90a, 90b and their associated pivot members 94 can be releaseably arrested by the securing device 88. Accordingly, any securing device which accomplishes the above mentioned arresting function may be used with the present invention.

[0026] At one end, the seat segment 68 is fixed to the pivot member 92. In the illustrated embodiment, the keepers 96 are each sized to accommodate at least a portion of the locking member 92, in which the locking member is spring biased via spring 98 to remain situated in one of the keepers 96. A guide block 100 houses the locking member 92 and spring 98 between the bracket members 90a and 90b. The locking member 92 is attached to a pull cable 102 such that a hand actuator 104 may clear the locking member 92 of the keepers 96.

[0027] Once the locking member 92 is cleared of the keepers 96, the support frame 40 may be transitioned to either the fully-reclined position or the chair position. Accordingly, it is to be appreciated that when the locking member 92 is accommodated in a first one of the keepers 96, the support frame, and hence cot 10, is releasably secured in the fully-reclined position, and when the locking member 92 is accommodated in a second one of the keepers 96, the support frame 40, and hence cot 10, is releasably secured in the chair position.

[0028] As also shown by FIG. 4, the securing device 88 and the support frame 40 provide a pin guide-fixed pin arrangement, generally indicated by symbol 106. The pin guide-fixed pin arrangement 88 includes a pin guide or track 108 that is located about a portion of a diameter of a fixed pin 110. In the illustrated embodiment, the fixed pin 110 is provided situated between the bracket members 90a, 90b, and slidably housed in the pin guide 108. The pin guide 108 as illustrated, is provided to the pivot member 94, which is rotatably attached between the bracket members 90a, 90b.

[0029] Although the present invention has been described in terms of a specific embodiment which is set forth in detail, it should be understood that this is by illustration only and that the present invention is not necessarily limited thereto, since alternative embodiments not described in detail herein will become apparent to those skilled in the art in view of the above description, the attached drawings and the appended claims. Accordingly, modifications are contemplated which can be made without departing from either the spirit or the scope of the present invention.