CZ2018422A3 - Power-assisted stretchers loader - Google Patents

Abstract

The loading device for the booster (1) includes a sliding guide block (4), a telescopic arm (3), a linear guide (2) fixed in the ambulance floor and a fastening system (5).

Description

Technical field

The invention relates to a loading device for a stretcher with a booster, comprising a sliding guide block, a sliding arm, a linear guide fixedly mounted on the ambulance floor, and a fastening system. The proposed device falls within the field of medical devices, namely the device used to load medical stretchers with a booster in a road ambulance.

BACKGROUND OF THE INVENTION

Loading facilities are used in road ambulances through which medical stretchers are loaded from the external environment into the internal ambulance buildings and subsequently secured for safe transport. The terrain conditions of the external environment cause height and angular differences in the reference planes of the stretcher and the loading system. The litter operation is approaching the loading system from variable directions in real conditions, which increases the mentioned differences.

An important part of the loading device is the extension arm, which includes the contact surfaces. In the extended state of the arm, the carrier is placed on the bearing surfaces with all its weight. By sliding the arm towards the ambulance, the loading system including the stretcher locks into a precisely defined lock position of the fastening system.

Resting the stretcher on the extendable arm is a critical step in the loading process. In this process, the carrier is fully loaded onto the defined seating surfaces of the arm. Correct alignment of the stretcher before sitting down requires increased operator attention. This also increases working time. There is a risk that the stretcher may be placed outside the mating surfaces, which can significantly increase safety risks for both the patient and the operator.

US 20160287454 A1 describes self-steer stretchers which comprise a support frame, a pair of legs and a hydraulic drive. The support frame is guided from the front end to the rear end of the stretcher. The pair of legs are in movable engagement with the support frame. The hydraulic drive is movably engaged with the pair of legs and the support frame, extending and retracting the pair of legs to the support frame. The hydraulic drive comprises a cylindrical housing, a rod and a sliding guide member. The sliding guide member is movably engaged with the cylinder housing and is rigidly engaged with the bar, the sliding guide member moving in the direction of the cylinder body.

Stretcher stretchers are described in EP 2523642 A1 and include a support frame, a pair of front legs, a pair of rear legs and a stretcher control system. A pair of front legs are slidably connected to the support frame. The front leg comprises at least one front wheel. A pair of rear legs is slidably connected to the support frame and each rear leg comprises at least one rear wheel. The stretcher drive system includes a front drive that drives the front legs and a rear drive that moves the rear legs. The front drive and rear drive raise or lower the support frame in tandem. The front drive raises or lowers the front end of the support frame independently of the rear drive, while the rear drive raises or lowers the rear end of the support frame independently of the front drive.

DE 102008005900 A1 discloses a telescopic ambulance table intended especially for use in ambulances. The telescopic ambulance table comprises a lower table which is arranged horizontally in the ambulance in the longitudinal direction to the stretcher and which is equipped with an articulated joint so that its vertical position can be changed. The telescopic ambulance table further comprises extendable supports which are slidably connected to the lower table and which are used to eject from the ambulance cargo compartment and subsequently clamp the stretcher. The telescopic ambulance table further includes

A3 2018 - 422 A3 Extendable prop drive, which controls the movement of the props in the longitudinal direction, and ensures the patient is transported on the stretcher in and out of the ambulance. The actuator is controlled by the actuator control, depending on the load and the position of the extendable supports.

The ambulatory stretcher described in EP 2431015 A2 consists of a base frame, a second frame and a support mechanism coupled to the base frame and the second frame. The support mechanism comprises at least one pair of frame members that are centrally connected to each other. The frame members each have opposite ends fixed to the base frame and the second frame, wherein at least one of said pair of frame members is provided with a first grip arranged between their median length and a base frame, while the second grip is arranged between their median length and said second frame. The first and second grips are arranged to contact the base frame and the second frame. This document describes the stretcher as a whole, not the ambulance loading device.

A combined system for loading and attaching stretchers is described in EP 2384728 A1. This system is designed for loading and unloading stretchers of normal height, approximately 76 centimeters, into an emergency rescue vehicle with a transport deck of more than 78 centimeters. The system includes a pair of rails, a sliding arm with a sliding block to safely pull the stretcher along the pair of rails, and a locking mechanism mounted on the sliding block. The extendable arm comprises a frame having a first end, a second end, a longitudinal body, two pairs of stabilizing rods, a pair of lifting pistons, and a three-point sliding block assembly securing the locking mechanism. The three-point sliding block assembly also includes a guidance area for the correct vertical guiding of the stretcher bar into the latch of the locking mechanism. The other end of the extendable arm is located adjacent to the interior of the vehicle. A pair of rails guide the stretcher into or out of the vehicle, while the locking mechanism releasably fixes the stretcher to the rails. The sliding arm with the sliding block is arranged such that the locking mechanism is positioned below the vehicle level at an angle of 10 ° to 25 ° and at a distance of 22.8 to 50 cm from the vehicle. It is not apparent from the embodiment of this system how the stretcher is guided to the sliding block in the correct horizontal plane. A disadvantage of this embodiment is that the other end of the extendable arm is itself retractable only to the end of the pair of rails, whereby a shorter guide surface of the stretcher is achieved only by means of a three-point sliding block assembly. Another disadvantage is that the locking mechanism has no further connection to other elements of the loading device, and is unlocked manually when the stretcher is pulled out of the ambulance. There is therefore no known solution where the extension arm and the sliding block are somehow fixed to each other. This solution does not mention the fastening systems in the ambulance floor for fastening the stretcher after loading into the ambulance, the stretchers being fixed only by their rear stops.

The stretcher support platform described in WO 9804228 A1 comprises a base frame that is adapted to secure the stretcher in an ambulance and a support platform with front and rear sections arranged on the base frame. The support platform further comprises lifting arms which are rotatably mounted between the base frame and the support platform. The front lift arm allows the stretcher to be pulled in and out of the ambulance, while the rear lift arm is slidably connected to the stretcher via a pivot joint formed on the front lift arm. This allows the stretcher to tilt to the desired position.

SUMMARY OF THE INVENTION

The object of the invention is to design a loading device for safe and intuitive loading of a stretcher with a booster in a road ambulance.

SUMMARY OF THE INVENTION The present invention provides a power-assisted stretcher loading device that includes a sliding guide block, an extendable arm, a linear guide fixedly mounted on the ambulance floor, and a fastening system.

-2GB 2018 - 422 A3

The stretcher includes a stretcher and a built-in undercarriage, with a U-bar mounted in the front of the undercarriage, two undercarriage rails, two front pins, a locking axis guiding surface and a double-action lock consisting of an upper lock and a lower latch. In the rear part of the chassis is located the rear pin and lever double acting lock, which unlocks it after pulling.

The sliding guide block guides the stretcher to the correct position relative to the extension arm, which in turn guides the entire assembly through a linear guide to the fastening system.

The sliding guide block forms a set of ramps to assist the user in the initial alignment of the stretcher to the loading system. The approach ramp consists of a main ramp, lateral ramps and adjacent faces in the longitudinal direction that are in contact with the horizontal bar at the front of the stretcher bogie, the leading ramp guiding the stretchers to the correct vertical position and lateral ramps with adjacent faces in the longitudinal direction guides the stretcher to the correct horizontal position. The stretchers are guided along the approach surfaces into two automatic autonomous locks, which simply unlock the guide block displacement and at the same time unite the construction of the stretcher and guide block. Each autonomous lock consists of a push lever, a gear mechanism and a latch, and when the bar in the front of the stretcher is pushed simultaneously on both push levers of the autonomous locks, the gear mechanism releases the latch and thereby unlocks the sliding guide block for linear displacement over with gliders mounted on the sliding guide block. This ensures that the stretcher is correctly guided at the next movement along the extension arm. Lock control is automatic and does not require user attention. The locks are designed with respect to the construction so that it cannot be unlocked after approaching the stretcher from the wrong positions in the vertical and horizontal sense. The autonomous locks block the horizontal backward movement of the stretcher when the sliding guide block is unlocked.

The retractable arm includes two guide endings with rollers, two guiding side bars with end stops at the front and a shaped recess for the latch, a locking axis located on the lever mechanism, an arm lock and an arm lock lever. The stretcher is correctly guided by the guide rails on the chassis, which rest on the outside of the telescopic arm by the guide tips. A lever mechanism is mounted on the extendable arm that controls the position of the locking axis relative to the sliding block position, the arm lock fixes the arm in the maximum extend position, and the arm lock lever has a contact surface enabling the extendable arm to be unlocked manually or by the stretcher. After passing the guide block, the mechanism is lifted, including the locking axis, which is then automatically locked into a double-action lock consisting of an upper lock and a lower latch and mounted on the stretcher chassis and the stretcher is locked against reverse. Locking the axle in the upper lock ensures the correct position of the stretcher in the longitudinal direction when the extension arm is touched, and the lower latch automatically locks with the transverse axis located in the extension arm when the stretcher is against the extension arm, thereby blocking the stretcher. The sequence of the individual steps of anchoring the stretcher allows the stretcher to lie in a precisely defined and secure position on the extendable arm. The double-action lock is unlocked by pulling the lever on the stretcher.

The design of the sliding guide block together with the extension arm design allows a wide range of relative positions of the loading system relative to the stretcher, but critical positions are eliminated.

When the slide arm is seated, the lower stretcher structure is folded to compress the slide arm lock lever. The unlocked retractable arm is inserted into the ambulance via a linear guide, where the front and rear pins on the stretcher chassis are automatically locked into the fastening system in the extreme position. The entire assembly is locked in the fastening system against lateral, longitudinal and vertical movements during transport.

-3GB 2018 - 422 A3

The linear guideway has a pair of mirrored stationary rails fixedly fixed to the ambulance floor, each stationary rail having a telescopically displaceable rail and a slide arm displaceably disposed therebetween, thereby ensuring a linear displacement of the slide arm between its precisely defined extreme positions. Preferably, the extension arm is supported on both sides on sliding carriages that travel on sliding bars.

The fastening system has a front block, a rear block and a tie rod. The front block of the stretcher is fixed to the front block and the rear block of the stretcher to the rear block. The front block is rigidly mounted in the ambulance floor and has two spring-loaded locking pins at the bottom provided with linkages coupled to the transmission axle, and in the central part of the front block the transmission axle is fitted with a transmission mechanism that positions the linkage rod relative to the transmission axis. Above the locking pins of the front block there are grooves for the front pins of the stretcher. The rear block is also mounted firmly in the ambulance floor and has a buckling gear at the bottom that positions the connecting rod to the lock bars, and at the top two lock bars, a spring-span between them, and two guide surfaces and a control lever at the rear. Above the locking cubes is a groove for the rear pin of the stretcher. By moving the control lever, both locking pins and both locking bars are unlocked simultaneously, and when the locking bars are reached the end position is automatically locked by a sprung spacer to guide the stretcher fixedly connected to the sliding guide block and the extension arm via a linear guide into the fastening system. To fully guide the stretcher, both front pins must fit into the front pin slots as well as the rear pin into the rear pin slot. By pressing the spring-loaded spacer, the two locking bolts and the two locking cubes are unlocked simultaneously, thereby blocking the movement of the stretcher in all directions.

Clarification of drawings

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be elucidated by means of the drawings in which: FIG. 1 is an isometric view of a loading device including a stretcher; FIG. 2 is an isometric view of a sliding guide block; FIG. Fig. 5 shows a detailed view of the locking mechanism principle of the extension arm and stretcher; Fig. 6 shows an isometric view of the fastening system; Fig. 7 shows a detailed view of the locking mechanism arrangement in the front block of the fastening system; Fig. 9 shows an isometric view of the arrangement of the mechanisms in the rear block of the fastening system; Fig. 10 shows a detail of the rear of the stretcher including the double-action lock lever and the rear pin; Fig. 12 shows a detail of the front part of the stretcher including the trapeze and the front pins from the bottom, and Fig. 13 shows the extreme positions of the locking axis on the withdrawable arm.

DETAILED DESCRIPTION OF THE INVENTION

A loading apparatus for a stretcher with a booster will be illuminated in an exemplary embodiment thereof with reference to the respective drawings.

The interconnection of the individual components of the device is shown in FIG. 1. The device comprises a stretcher 1, a sliding guide block 4, a sliding arm 3, a linear guide 2 fixed in the ambulance floor and a fastening system 5, also fixed in the ambulance floor.

The stretcher 1 is shown in Figures 4, 10 and 12 and includes a stretcher portion and a built-in undercarriage. In the front of the bogie there is a horizontal bar 43, the bogie is equipped with two guide rails 49, two front pins 44, a surface 22 for guiding the locking axis 16 and a double-acting

A 201 of the lock 23 consisting of the upper lock 24 and the lower latch 25, the rear pin 45 and the lever 40 of the double-action lock 23 are located at the rear of the chassis.

The sliding guide block 4 is shown in FIG. 2. In this exemplary embodiment, the sliding guide block 4 comprises a carcass-covered main drive surface 6 serving as its cover. Furthermore, the side landing surfaces 7, which are the contact surfaces for the front of the stretcher structure 1, including the horizontal bar 43 and a pair of front pins 44, as shown in FIG. 12. The side landing surfaces 7, which guide the horizontal bar 43 in horizontal direction, while the main approach surface 6 guides the horizontal bar 43 in the vertical direction. The lateral landing surfaces 7 are adjoined by longitudinal surfaces 8 which precisely define the horizontal bar 43 in the horizontal plane of the stretcher 1. The sliding guide block 4 is further fitted with two autonomous locks 9 formed by a push lever 10, a gear mechanism 11 and a latch 12. of FIG.

The function of the sliding guide block 4 is as follows. The sliding guide block 4 is released only when the two autonomous locks 9 are unlocked by means of the bar 43, which pushes the lever 10 in such a way that the gear mechanism 11 releases the latch 12 and thereby ensures the movability of the sliding guide block 4. when unlocked, sets to the position in which they block the backward movement of the stretcher 1 in the horizontal direction. This blocking is effective throughout the trajectory along the extension arm 3 except for the extreme starting position, i.e. the position where the sliding block 4 is located at the edge of the arm 3. The sliding guide block 4 is fitted with gliders 13 which allow linear displacement over the extension arm 3.

An exemplary embodiment of the extendable arm 3 is shown in Fig. 4. The extendable arm 3 comprises guiding side bars 14, guide tips 15 with rollers, a locking axis 16 that is fixed in the arms of the lever mechanism 17, arm lock 18 and arm lock lever 19. The guide rails 14 for the sliding guide block 4 are provided with limit stops 20 and a shaped recess 21 for the latch 12. The guide rails 49 of the stretcher 1 are guided to the outside of the extension arm 3 by the guide tips 15.

The lever mechanism 17 controls the position of the locking axis 16 in relation to the position of the sliding guide block 4. After sliding the sliding guide block 4 forwards, the locking axis 16 automatically raises to the highest position as shown in FIG. 13. The interval between the lowest and highest position of the axis 16 defines a range of permissible vertical distance between the extension arm 3 and the stretcher 1.

The stretcher 1 has a surface 22 for guiding the axis 16 into the double-action lock 23 located in the chassis of the stretcher 1, which double-action lock 23 comprises an upper lock 24 and a lower latch 25 as shown in Fig. 5. The second step of locking the double-action lock 23 is that the lower pawl 25 automatically locks the transverse axis 26 when the stretcher 1 is seated. on the extension arm 3, thereby blocking the tilting of the stretcher 1 in the longitudinal direction. When unlocking the double-action lock 23, both steps are performed simultaneously by pulling the lever 40 on the stretcher 1 shown in FIG. 10. The lock 18 of the arm 3 fixes the extension arm 3 in the position of maximum extension of the loading device. The lever 19 of the arm 18 of the arm 3 has a contact surface 27 enabling unlocking of the hands or chassis structures as shown in Fig. 4.

The linear guide 2 comprises a pair of mirrored stationary rails 41 fixedly mounted in the ambulance floor, with each stationary rail receiving a telescoping slide bar 48. A slide arm 3 is displaceably disposed between the slide bars 48. Preferably, the slide arm 3 is supported on both sliding carriages. The travel range of the telescopically sliding rails defines the working path of the extension arm 3. The maximum extension of the telescopically sliding rails is designed with respect to the installation dimensions of commonly used vehicles, while avoiding handling collision with any part of the vehicle body (eg road ambulance).

-5GB 2018 - 422 A3

The fastening system 5 comprises a front block 28, a rear block 29, and a tie rod 30 as seen in FIG. 6. The front block 28 has two grooves 46 for the front pins 44 positioned on the stretcher 1 as seen in FIGS. 6 and 12, and at the sides two spring-loaded locking pins 31 at the bottom provided with rods 32 which are connected to the transmission axis 33 as shown in FIG. 7. In the central part of the front block 28, the transmission axis 33 is fitted with a transmission mechanism 34 which is adjustable 6, 8 and 9, the rear block 29 comprises a buckling gear 35, locking blocks 36, a spring spacing 37, guide surfaces 38, a control lever 39, and a groove. 47 for the rear pin 45 located on the litter 1. Applying force to the control lever 39 simultaneously unlocks the two locking pins 31 (see FIG. 6) and the two locking blocks 36 (see FIG. 9). The interlocking of the assembly comprising the front and rear blocks 28 and 29 and the connecting rod 30 ensures that both the locking pins 31 and the two locking bars 36 remain in the unlocked position. By pressing the spring spacer 37, the front and rear blocks 28 and 29 are unlocked and locked at the same time both the locking pins 31 and the two locking bars 36. In the locked state, the fastening system 5 locks the front pins 44 and the rear pin 45 and thereby moving the stretcher 1 in all directions .

Industrial applicability

The present invention can be used in health care, particularly in devices for loading medical stretchers with a booster into a road ambulance.

PATENT CLAIMS

Claims (2)

A loading apparatus for a stretcher (1) with a booster, comprising a sliding guide block (4), a sliding arm (3), a linear guide (2) fixed in the ambulance floor and a fastening system (5), the stretcher (1) comprising a stretcher and a bogie, wherein the sliding guide block (4) has a main access surface (6), and wherein the linear guide (2) comprises a pair of mirrored stationary rails (41) fixed in the ambulance floor, characterized in that a. the stretcher (1) at the front of the bogie comprises a bar (43), the bogie is further provided with two guide bars (49), two front pins (44), a guide axis (16) guide surface (16) and a double-action lock (23) ) comprising an upper lock (24) and a lower pawl (25), wherein a rear pin (45) and a lever (40) of the double-action lock (23) are located at the rear of the chassis; b. the sliding guide block (4) has lateral landing surfaces (7) and adjacent surfaces (8) in the longitudinal direction which are in contact with the front part of the stretcher (1), wherein the lateral landing surfaces (7) with adjacent surfaces (8) in guiding the stretcher (1) to the correct horizontal position in the longitudinal direction, and furthermore, the sliding guide block (4) is provided with two autonomous locks (9) each comprising a thrust lever (10), a gear mechanism (11) and a latch (12); when the front part of the stretcher (1) is pressed simultaneously on both thrust levers (10) of the autonomous locks (9) by means of the gear mechanism (11) the latch (12) is released and thus the sliding guide block (4) is released a sliding arm (3) by means of sliders (13) mounted on the sliding guide block (4), the autonomous locks (9) blocking the backward movement of the stretcher (1) in the horizontal direction after unlocking the sliding guide block (4); C. the extension arm (3) has two guide ends (15) with rollers, two guide side bars (14) with end stops (20) at the front and a shaped recess (21) for the latch (12), a locking axis (16) located on the lever mechanism (17), the arm lock (18) and the arm lock lever (19), the lever mechanism (17) controlling the position of the locking axis (16) relative to the sliding guide block (4); extension arm (3) in position - 201A - 422 A3 maximum extension and the arm lock lever (19) has a contact surface (27) enabling the extension arm (3) to be unlocked manually or by the stretcher chassis (1), the locking axis (16) being in the double-acting stretcher lock (23) (1) guided by a surface (22) where locking of the locking axis (16) in the upper lock (24) of the double-action lock (23) ensures correct positioning of the stretcher (1) in the longitudinal direction after contacting the extension arm (3) and lower latch ( (25) the double-action lock (23) automatically locks with the transverse axis (26) located in the extendable arm (3) when the stretcher (1) rests against the extendable arm (3) thereby blocking the roll-over (1) in the longitudinal direction; the double-action lock (23) is unlocked by pulling the lever (40) of the double-action lock (23) on the stretcher (1); d. the linear guide (2) comprises in each stationary rail (41) a telescopically displaceable rail (48) mounted and a sliding arm (3) is displaceably disposed between the sliding strips (48), providing linear displacement of the sliding arm (3) along the sliding moldings (48) between its extreme positions; and e. the fastening system (5) has a front block (28), a rear block (29), and a tie rod (30), the front block (28) being firmly seated in the ambulance floor and having two spring-loaded locking pins (31); over which there are grooves (46) for the front pins (44) of the stretcher (1) and which are provided in the lower part with rods (32) connected to the transmission axis (33), and in the central part of the front block (28) ) is fitted with a gear mechanism (34) that positions the linkage (30) with respect to the transmission axis (33), the rear block (29) being fixedly mounted in the ambulance floor and having a buckling gear (35) at the bottom which positions the linkage ( 30) with respect to the locking bars (36), and at the top two locking bars (36), between them a sprung spacer (37), above them a groove (47) for the rear pin (45) of the stretcher (1), and further in the rear two guide surfaces (38) and a control lever (39) where the control lever is moved The locks (39) unlock both lock pins (31) and both lock blocks (36) at the same time, and when the lock bars (36) reach the extreme position, the spring-loaded spacer (37) is automatically locked to guide the stretcher with the sliding guide block (4). with the extension arm (3) into the fastening system (5), and wherein the compression of the spring-loaded spacer (37) unlocks and thereby locks both the locking pins (31) and the two locking blocks (36) at the same time. system (5) in all directions. Loader loading device (1) with a booster according to claim 1, characterized in that the extension arm (3) is supported on both sides on a pair of sliding carriages (42) that run between a pair of sliding bars (48).