KR20240149110A - Carriage for stretcher cart - Google Patents

Abstract

The present invention discloses a patient transport cart having a braking device for braking front wheels and rear wheels, which are mounted in pairs on the front and rear of a frame that supports a body, respectively, to stop movement or release the stopped state, the patient transport cart including: a first cam shaft that connects the braking devices of the front wheels and mechanically operates the braking devices of the front wheels in accordance with an operation of stepping on and turning pedals mounted on both ends; a first crank arm that is fixed to the first cam shaft and converts rotational motion into linear motion; a second cam shaft that connects the braking devices of the rear wheels and mechanically operates the braking devices of the rear wheels in accordance with an operation of stepping on and turning pedals mounted on both ends; a second crank arm that is fixed to the second cam shaft and converts rotational motion into linear motion; and a coupling rod that connects the first crank arm and the second crank arm and mechanically operates the braking devices of the front wheels and the rear wheels simultaneously when either pedal is stepped on and turned.

Description

CARRIAGE FOR STRETCHER CART

The present invention relates to a four-wheeled patient trolley for facilitating the movement of a patient, and more specifically, to a patient trolley for facilitating the movement of a patient, which minimizes inconvenience caused by protrusion and contact interference of a pedal operated by stepping on with a foot to operate a brake device mounted on a wheel, and further protects a cover frame, and further improves the convenience of use by allowing the brake devices independently mounted on each of the four wheels to operate simultaneously even when a user operates the pedal on only one wheel with a foot.

Today, patient carriers are widely used to safely and conveniently move and transport patients immediately after surgery, patients with spinal and musculoskeletal injuries, patients with cardiovascular disease, stroke patients, and patients with limited mobility (hereinafter collectively referred to as “patients” in the present invention).

These patient transport carts can adjust the height using actuators to fit the ward bed or operating table, and can use brake devices to lock the four wheels while moving and transporting the patient, thereby minimizing the burden on medical personnel or caregivers involved in transporting the patient, thereby increasing manpower efficiency.

In particular, the brake device can stop or release the wheels from moving with a simple action of pressing the pedal.

However, conventional brake devices had a structural problem in that the foot pedal, which is operated by stepping on the pedal to operate the brake, protruded outward, causing contact interference during movement.

In addition, in order to completely stop or release the wheels of the patient transporter, it was necessary to step on each pedal on each of the four wheels one by one, which was cumbersome and inconvenient, and there was a problem that the convenience of use was significantly reduced.

The background technology or prior art described herein is information that the inventor possesses or acquired in the process of deriving and completing the present invention, and is intended to help understand the technical significance of the present invention and to be usefully used in prior art searches and examinations, and does not mean technology that was generally known and widely used in the technical field to which the present invention belongs prior to the filing of the present invention.

KR 10-1688731 B1(2016. 12. 15.) KR 10-1427721 B1(2014. 08. 01.) KR 10-2311865 B1(2021. 10. 06.) KR 10-2019-0136589 B1(2019. 12. 10.)

Accordingly, the inventor of the present invention comprehensively considered the above-mentioned matters and, at the same time, made great efforts to develop a novel structure of a patient transport cart, which minimizes the inconvenience caused by the protrusion and contact interference of a pedal that is operated by stepping on with a foot to operate a brake device attached to a wheel, and, at the same time, improves the convenience of use by allowing the brake devices independently attached to each of the four wheels to operate simultaneously even if the user operates only the pedal attached to one wheel with his or her foot, and as a result, led to the creation of the present invention.

Therefore, the technical problem and purpose to be solved by the present invention is to provide a patient transport cart that can minimize inconvenience caused by protrusion and contact interference of the pedal.

Another technical problem and object of the present invention is to provide a patient transport cart that enables the braking devices of four wheels to operate simultaneously even when only one pedal is operated by foot.

The technical problems and objectives to be solved by the present invention are not limited to the technical problems and objectives mentioned above, and other technical problems and objectives not mentioned will be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

In order to realize the new idea for solving the technical problem of the present invention as described above and effectively achieve a specific technical purpose, a specific means according to an embodiment of the present invention is a patient transport cart having a brake device for braking front and rear wheels, which are mounted in pairs on the front and rear of a frame supporting a body, respectively, to stop movement or release the stopped state, a first camshaft connecting the brake devices of the front wheels and mechanically operating the brake devices of the front wheels according to an operation of stepping on and turning pedals mounted on both ends, a first crank arm fixed to the first camshaft and converting rotational motion into linear motion, a second camshaft connecting the brake devices of the rear wheels and mechanically operating the brake devices of the rear wheels according to an operation of stepping on and turning pedals mounted on both ends, a second crank arm fixed to the second camshaft and converting rotational motion into linear motion, and connecting the first crank arm and the second crank arm, and when either one of the pedals is stepped on and turned, the first and second crank arms are interlocked so that the front wheels The present invention proposes a braking device for a patient transporter, characterized by including a coupling rod that mechanically operates the braking devices of the rear wheels simultaneously.

Accordingly, the present invention can improve the convenience of use and operation by allowing the brake devices independently attached to each of the four wheels to operate simultaneously even if the user operates only the pedal attached to one wheel with his or her foot.

In addition, as a preferred embodiment (aspect) of the present invention, the pedal comprises a body portion fixed to the ends of the first and second cam shafts, a wing portion integrally formed on both sides of the body portion and protruding toward the frame, and a protruding portion formed on the upper surface of the wing portion for anti-slip, thereby minimizing inconvenience caused by the protrusion and contact interference of a pedal that is operated by stepping on it with a foot to operate a brake device attached to a wheel, and also allowing a user to operate the pedal more stably with one foot.

In addition, as a preferred embodiment (aspect) of the present invention, the upper surface of the wing portion is formed as a slope that becomes higher as it goes toward the frame, so that a user can operate the pedal more easily and conveniently with one foot.

In addition, as a preferred embodiment (aspect) of the present invention, the brake device comprises a cam having angled holes for fitting and fixing the first and second cam shafts and having lobes formed on the outer circumference, a tappet that is raised and lowered by the rotational operation of the cam, a ratchet wheel coupled to the lower portion of the tappet and having ratchet gears formed at regular intervals on the outer circumference, a biasing spring mounted on the upper portion of the tappet and returning the tappet to its original position by elastic force when the force pressing the tappet by the rotation of the cam is removed, a rocker disposed inside a wheel bracket that supports the front and rear wheels to selectively contact the outer circumferences of the front and rear wheels, one end of which is connected to the wheel bracket and the axle pin by a pin connection, and a latch disposed inside the wheel bracket and one end of which is connected to the rocker and the axle pin by a pin connection, so that when the tappet is lowered by the operation of depressing one side of the pedal, the rocker rotates downward around the axle pin to lower the front and rear wheels and By applying pressure to the outer circumference of the rear wheel, and at the same time rotating the latch upward around the axle pin, the latch can be engaged with the ratchet gear of the ratchet wheel to stop the front and rear wheels from moving.

According to the technical idea and embodiment of the present invention, which are based on a unique solution to solve the above technical problems, it is possible to minimize inconvenience caused by the protrusion and contact interference of a pedal operated by stepping on the foot to operate a brake device attached to a wheel.

In addition, even if the user operates only the pedal attached to one wheel with his or her foot, the brake devices attached independently to each of the four wheels can operate simultaneously, thereby improving the convenience of use and operation.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by a person skilled in the art to which the present invention belongs from the description of the claims.

Figure 1 is a perspective view showing a patient transport cart to which a patient transport cart cart according to an embodiment of the present invention is applied.
Figure 2 is a perspective view showing a patient transport cart according to an embodiment of the present invention.
Figure 3 is an enlarged view of a patient transport cart according to an embodiment of the present invention.
Figure 4 is a longitudinal cross-sectional view showing a one-way operating state of a patient transport cart according to an embodiment of the present invention.
FIG. 5 is a longitudinal cross-sectional view showing the reverse operating state of a patient transport cart according to an embodiment of the present invention.
Figure 6 is a longitudinal cross-sectional view showing the brake release state of the front wheels of a patient transport cart according to an embodiment of the present invention.
Figure 7 is a longitudinal cross-sectional view showing the braking state of the front wheels of a patient transport cart according to an embodiment of the present invention.
FIG. 8 is a plan view showing a part of the brake device of a patient transport cart according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the attached drawings.

Prior to this, it should be noted that the terms described below have been defined in consideration of their functions in the present invention, and should be interpreted as concepts consistent with the technical idea of the present invention and meanings commonly used or commonly recognized in the relevant technical field.

In addition, if it is determined that a detailed description of a known function or configuration related to the present invention may obscure the gist of the present invention, the detailed description is omitted.

The drawings attached herein may be exaggerated or simplified in some parts to facilitate the explanation and understanding of the composition and operation of the technology, and it is to be noted that each component in the drawings does not exactly match the actual size and shape.

In addition, the term and/or in this specification means a combination of a plurality of related described items or including any item among a plurality of related described items, and when it is said that a part includes a certain component, this does not mean excluding other components, unless specifically stated otherwise, but rather that other components may be included.

That is, the terms “include” or “have” as set forth in this specification mean that there exists a feature, number, step, process, operation, component, part, or a combination thereof, but should be understood to not exclude the possibility of the presence or addition of one or more other features, numbers, steps, processes, operations, components, parts, or combinations thereof.

In addition, the terms top, bottom, upper surface, lower surface, or upper, lower, upper side, lower side, front/back, left/right, etc. used in the present invention are used for convenience in distinguishing the relative positions of each component. For example, the upper part in a drawing may be named or referred to as the upper part and the lower part as the lower part, and the length direction may be named or referred to as the front/back direction, and the width direction may be named or referred to as the left/right direction.

Additionally, the terms first, second, etc. used in the present invention can be used to describe various components. That is, the terms first, second, etc. can be used only for the purpose of distinguishing one component from another component.

As illustrated in FIGS. 1 to 8, a patient transport cart according to an embodiment of the present invention has front wheels (2) and rear wheels (3) that support the weight of the body on both the left and right sides of a frame (1) that supports the body and can freely change direction with respect to the frame (1) to drive smoothly, and is equipped with a brake device (10) that stops movement or releases the stopped state by braking each of the front wheels (2) and rear wheels (3) by stepping on a pedal (120).

In addition, it includes a first cam shaft (110), a first crank arm (130), a second cam shaft (140), a second crank arm (150), and a coupling rod (160).

The first cam shaft (110) is formed in a polygonal bar shape, and both ends of its length connect the brake devices (10) of the front wheels (2) formed as a pair on the left and right.

And, pedals (120) are fixed to both ends of the first cam shaft (110), and are fitted into angled holes (11a) formed in cams (11) constituting the brake device (10) so as to mechanically operate the brake device (10) of the front wheels (2) according to the operation of stepping on and turning one side of the pedal (120) with the foot.

The first crank arm (130) has its upper part fixed to the middle part of the first cam shaft (110) to change rotational motion into linear motion.

That is, the first crank arm (130) converts the motion of the first cam shaft (110) rotating at a certain angle according to the operation of stepping on the pedal (120) into the linear motion of the coupling rod (160).

The second cam shaft (140) is formed in a polygonal bar shape, and both ends of its length connect the brake devices (10) of the rear wheels (3) formed as a pair on the left and right.

And, pedals (120) are fixed to both ends of the second cam shaft (140), and are fitted into angled holes (11a) formed in cams (11) constituting the brake device (10) so as to mechanically operate the brake device (10) of the rear wheels (3) according to the operation of stepping on one side of the pedal (120) with the foot.

The second crank arm (150) has its upper part fixed to the middle part of the second cam shaft (140) to change rotational motion into linear motion.

That is, the second crank arm (150) converts the motion of the second cam shaft (140) rotating at a certain angle according to the operation of stepping on the pedal (120) into the linear motion of the coupling rod (160).

The coupling rod (160) is formed in a thin and long rod shape, and both ends in the longitudinal direction are connected to the lower portions of the first crank arm (130) and the second crank arm (150) by pin (P) joints so that a certain limited movement can be performed.

That is, the coupling rod (160) acts to mechanically and simultaneously operate the brake devices (10) of the front wheels (2) and the rear wheels (3) by causing the first crank arm (130) and the second crank arm (150) to interlock when one of the pedals (120) attached to each end of the first and second cam shafts (110) (140) is stepped on and turned.

Meanwhile, as shown in Fig. 3, the pedal (120) includes a body part (121) for fixing to the ends of the first and second cam shafts (110) (140), a wing part (122) formed integrally on both the front and rear sides of the body part (121) and protruding toward the frame (1), and a protruding part (123) formed on the upper surface of the wing part (122) for anti-slip.

And the wing (122) is formed as a slope that gradually increases in elevation as it approaches the frame (1).

That is, the flat horn-shaped wing portions (122) on both sides of the pedal (120) are formed in a shape in which the upper surface is inclined at an angle of about 30 degrees while being bent toward the frame (1), so that not only can the discomfort caused by the protrusion and contact interference be minimized, but also the user can operate the pedal more easily, conveniently, and stably with one foot.

Meanwhile, as shown in FIGS. 6 to 8, the brake device (10) includes a cam (11), a tappet (13), a ratchet wheel (15), a biasing spring (17), a rocker (20), and a latch (30).

The cam (11) has an angled hole (11a) in the center for fixing the first and second cam shafts (110) (140), and a lobe (12) is formed to protrude around the outer periphery.

The tappet (13) is designed to rise and fall by the rotational operation of the cam (11).

A ratchet wheel (15) is fixed to the lower part of the tappet (13), and ratchet gears (15b) are formed at regular intervals on its outer periphery.

The biasing spring (17) is mounted on the upper part of the tappet (13).

That is, when the force pressing the tappet (13) by the cam (11) is removed, the biasing spring (17) returns the tappet (13) to its original position with its own elastic force.

Here, it is preferable to use a compression coil spring as the biasing spring (17), but it is not limited thereto. Any material that has the same effect as a coil spring due to elastic restoring force, such as elastic rubber, may be used.

The rocker (20) is positioned on the inside of the wheel bracket (5) that supports the front wheel (2) and the rear wheel (3) respectively to selectively contact the outer periphery of the front wheel (2) and the rear wheel (3).

And one side of the rocker (20) is connected to the wheel bracket (5) and the axle pin (19) by a pin joint.

The latch (30) is positioned inside the wheel bracket (5) to lock the tappet (130) from rotating by engaging the ratchet gear (15b) of the ratchet wheel (15) when the rocker (20) is braking.

And one side of the latch (30) is connected to the rocker (20) and the pivot pin (19) by a pin joint.

The main functions and operating principles of the patient transport cart according to the embodiment of the present invention configured as described above are as follows.

First, when the user steps on and turns one of the pedals (120) attached to each end of the first and second cam shafts (110) (140), the first crank arm (130) and the second crank arm (150) are linked by the coupling rod (160), so that the brake devices (10) of the front wheels (2) and the rear wheels (3) can be mechanically operated simultaneously.

That is, the first and second cam shafts (110) (140) are configured as a linkage combination that connects the first and second crank arms (130) (150) with a coupling rod (160) to transmit the movement of one side to the other side and move simultaneously, so that when one of the two wing parts (122) of the pedal (120) is stepped on with the foot, the first and second cam shafts (110) (140) rotate simultaneously and rotate the cam (11) fixed to each of them, and as a result, the lobe (12) of the cam (11) presses down the tappet (13), and at the same time, the lower end of the tappet (13) presses down the rocker (20).

In this process, the rocker (20) rotates downward around the axle pin (19) to pressurize the outer periphery of the front wheel (2) and the rear wheel (3), and at the same time, the rocker (20) rotates the latch (30) upward around the axle pin (19) to engage the ratchet gear (15b) of the ratchet wheel (15).

Accordingly, by stepping on the pedal (120) with the foot, the tappet (13) pushes down the rocker (20) and closes it against the outer periphery of the front wheel (2) and the rear wheel (3), and the latch (30) engages the ratchet gear (15b) in a locked operation, thereby stopping the front wheel (2) and the rear wheel (3) from moving.

And, according to the operation of stepping on the other side of the wing parts (122) of the pedal (120), the first and second cam shafts (110) (140) simultaneously rotate in opposite directions, causing the cams (11) fixed to each of them to rotate in opposite directions, thereby removing the force that causes the lobe (12) of the cam (11) to press the tappet (13).

At this time, as the tappet (13) descends, the biasing spring (17) in a compressed state naturally returns the tappet (13) to its original position by elastic force.

Meanwhile, the present invention is not limited to the above-described embodiment and the attached drawings, and can be variously modified and applied in various ways not illustrated within the scope that does not depart from the technical spirit of the present invention, and it is obvious to a person having ordinary skill in the art to which the present invention pertains that it can be widely applied by changing each component and equivalent other embodiment.

Therefore, the contents related to modifying and applying the technical features of the present invention should be interpreted as being included within the technical idea and scope of the present invention.

2: Front wheel 3: Rear wheel
10: Brake device 110: Frame
120: Pedal 121: Body
122: Wing 122: Roughness
130: 1st camshaft 140: 1st crank arm
150: 2nd camshaft 160: 2nd crank arm
170: Coupling load

Claims (4)

In a patient transport cart equipped with a brake device (10) for stopping movement or releasing the stopped state by braking the front wheels (2) and rear wheels (3) mounted in pairs on the front and rear of the frame (1) supporting the body, respectively,
A first cam shaft (110) that connects the brake devices (10) of the front wheels (2) to each other and mechanically operates the brake devices (10) of the front wheels (2) according to the operation of stepping on and turning the pedals (120) mounted on both ends;
A first crank arm (130) fixed to the first cam shaft (110) and converting rotational motion into linear motion;
A second cam shaft (140) that connects the brake devices (10) of the rear wheels (3) to each other and mechanically operates the brake devices (10) of the rear wheels (3) according to the operation of stepping on and turning the pedals (120) mounted on both ends;
A second crank arm (150) fixed to the second cam shaft (140) and converting rotational motion into linear motion; and
A coupling rod (160) which is connected at both ends with a pin (P) joint to the first crank arm (130) and the second crank arm (150), and which mechanically operates the brake devices (10) of the front wheel (2) and the rear wheel (3) simultaneously by causing the first crank arm (130) and the second crank arm (150) to work together when one of the pedals (120) is stepped on and turned;
A patient transport cart, including:
In the first paragraph,
The above pedal (120) is,
A body part (121) fixed to the ends of the first and second cam shafts (110)(140);
A wing part (122) formed integrally on both front and rear sides of the body part (121) and protruding toward the frame (1); and
A protruding portion (123) formed on the upper surface of the wing portion (122) to prevent slipping;
A patient transport cart, including:
In the second paragraph,
The above wing part (122) is
A patient transport cart formed with a slope that gradually increases in elevation as it approaches the frame (1).
In the first paragraph,
The above brake device (10) is
A cam (11) having an angled hole (11a) for fitting and fixing the first and second cam shafts (110) (140) and having a lobe (12) formed on the outer circumference;
A tappet (13) that rises and falls by the rotational operation of the above cam (11);
A ratchet wheel (15) fixed to the lower part of the above tappet (13) and having ratchet gears (15b) formed at regular intervals on the outer circumference;
A biasing spring (17) mounted on the upper portion of the tappet (13) and used to return the tappet (13) to its original position by elastic force when the force pressing the tappet (13) by the rotation of the cam (11) is removed;
A rocker (20) is arranged on the inside of the wheel bracket (5) that supports the front wheel (2) and the rear wheel (3) respectively to selectively contact the outer periphery of the front wheel (2) and the rear wheel (3), and one end of which is connected to the wheel bracket (5) and the axle pin (19) by a pin joint; and
A latch (30) positioned on the inside of the wheel bracket (5) and having one end connected to the rocker (20) and the axle pin (19) by a pin joint;
Including,
A patient transport cart, wherein when the tappet (13) is lowered by stepping on one side of the pedal (120), the rocker (20) rotates downward around the axle pin (19) to pressurize the outer periphery of the front wheel (2) and the rear wheel (3), and the latch (30) rotates upward around the axle pin (19) to engage the ratchet gear (15b) of the ratchet wheel (15) to stop the front wheel (2) and the rear wheel (3) from moving.

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