GB2390836A - Stair chair - Google Patents

Abstract

A stair chair comprises a chassis 13 with an adjustable back support 3. A pair of X-shaped rollers 5 supports the chair on stairs, the rear one engaging with a curved brake 9, so that high friction ends 8 of the roller rub on the brake 9 to slow the chair. The curved brake 9 is mounted with springs 10 to keep pressure on the frictional contact. A hinged door is mounted on each curved brake 9 and spring loaded to an open position inside the curve where it prevents the roller rotating in the direction for the chair to move down the stairs. A string 27 releases the door for downward movement. Wheels 18 are provided for the chair to travel on flat surfaces, the rear wheel is folded up for travel on stairs.

Description

STAIR CHAIR

The Invention relates to a pushchair, pram or stroller of a typ which includes wheels and X shaped rollers such as axis mounted in such a way that the Cam is balanced level on the stair in a safe way.

Such a pram or pushchair may be know but it may suffer f om breaking problems, because it does not have any means in which to rest on the stairs.

A normal pushchair or pram maybe very difficult to lift up the stairs without bumping it up and therefore disturbing the baby or it may need two people to actually lift it up the stairs or carry it down. The only other way is to take the baby out but this is not usually an option The object of this invention is to provide a pram or pushcha r which allows easy drive up and down the stairs, it could carry one or two Wies or even indeed a disabled person.

this would be done with little effort of the part of the person controlling it and with regard for the baby inside the pushchair.

Accordingly, this invention is to provide a stair chair including three or four axis which enable the pram to travel up and down the stairs and cove motion controller mounted on the top of the axis to provide safe mobon to the stair chair and three or four wheels to enable the stair chair to travel in a flat surface.

A preferred embodiment of the invention will be described with reference to accompanying drawing in which: FIGURE 1 shows a side view of the whole stair chair FIGURE 2 shows a back view of the stair chair FIGURE 3 shows a side view of the stair chair levelled on a stair, and the rear wheels lifted up FIGURE 4 shows the curse breaker, the breaker holder bars and pulling spring.

FIGURE 5 shows front view of the curve breaker with a small hinged door.

FIGURE 6 is a section showing the small door with a light spring mounted on the top.

The whole door is to provide safety FIGURE 7 shows the curve holder pipe and a spring mounted inside it and the top of the pipe is attached to a owe to stope the spring and the breaker bare from coming off as explained below.

( As shown in Figure 1 and 2, the stair chair comprises a back supporter bars 3,4 mounted on the chacy 13.

3 horded together in adjustable bare 4 in a way to increase the width of the backsupporter to gain space for two seats.

The rear axes roller 5 horded together by bar 6 which the axes rotas about.

The end of the bare axis roller 8 made to reduce banging and provide high friction with the curve 9, preferably, 8 to be changable in case of losing the original size from such friction and the axis 5 to be adjustable, minimise and maximise, example ( building the axis in parts) attached together by means of Joint,screw, pins or any other means of adjustment The axis 5 is free rotate about the bars 5 and 22.

The curve breaker 9 attached to the axis holder 7 in way to keep the breaker in free movnnent up and down and thats by two tubes or 29 and 11.

as shown in Figure 2 and 4, the pipe 29 is free to move along 7 and attached to 11 by welding or screwing or any other means.

Referring to the drawing the whole breaker is a means to provide safety by slowing and stopping the chair when required and that by pressure to be applied on bar 12.

As shown in Figure 2,4,7, the spring 10 mounts inside pipe 11 to keep the prusher continuous on 9. the pipe 1 1 is supporting 10, and the ends of 12 which made like pistons mounted on the tape of 10. the top of I 1 is a U shape to stop 10 and 12 from coming off.

The breaking happens by friction between the curve 9 and the end of the axis 8 which is made from rubber or breaking material like carbon or any ether matrial providing adequate friction.

As shown in figure 1,3 that 17 is means of supporting, to support the whole body to keep it standing up and preferably to be collapse enabling it to take a smaller space in the car or the house.

17, is to support the rear axis and the breaker holder 7 to the chacy 13, and supporting the front wheel(s) holder 14 to 13, and the rear wheels holder 15 to the back supporter bars 3, so 19 is supposed 23 to the front wheels holder 14.

20 holding 19 to the chacy 13.

I 9 is the front axis holder by bar 22 which crossing the axis as shown in figure 2.

As shown in Figure 2,4,5, 6 the small hinged door 24 is mounted on the Owe 9, the door 24 which opens down towards the axis roller 5. this is done by pushing down with light spring which mounted on the top of 24, and the door then opens to a small degree this is done by using 34 two strings or wires or any other means of holding 24. whole the operation is to proived safety to the chair when its travelling up the stairs in case the user leR the pram by accident so the opaqued door 24 will ban me axes 5 from moving on the other dirction, its preferably to be operated when releas the curve breaker 9.

As shown in Figure 4, 27 is a string or wire attached to 26, passing through 12 and the two bars hole 2%, all the operation is pulling 26 inside 12 by string 27 to release the breaker which will be pulled up by the spring 21 at the same time 35 will reales 24, the wire or string 35 mount round diversion pin 30 to pull the pin locker 25 which catch 24 when the stair chair in its way down the stairs.

Claims (7)

1. A stair chair including three or flow axis which enable the pram to travel up and down the stairs and curve motion controller mounted on the top of the axis to provide safe motion to the stair chair and three or four wheels to enable the stair chair to travel in a flat surface.

2. A stair chair as claimed in claim I is provided with safety means to be mounted on the lope of the axis shape roller to control the stair chair motion as a safety means for slowing and sloping on the stairs when its driven down on the stairs.

3. a stair chair as claimed in Clam I or Claim 2 where in small hinged door mounted on

the curve breaker to provid safty means to stop the chair from going down the stairs.

4. A stair chair as claimed in Clam 1 or Claim 2 or Claim 3 the back supporter and the rear wheels to be adjustable as to provid mor space for mar than one seat.

5. A stair chair as claimed in Claim I has muserd axis dependent on the steps are in used,and the front axis to be lower than the the rear axis and far as to provid balance on the stairs.

6. A stair chair as claimed in claim 1, 2, 3, 4, or Claim 5 wherein foldable rear wheel in way to let the axis do the jobe in the stairs without the wheels

7. A stair chair substantially as herein described with reference to figures 1-7 of the the accompanying drawing