阅读说明：本技术 一种急诊内科心脑肺复苏抢救装置 (Emergency internal medicine department heart cerebral lung resuscitation rescue device ) 是由 杨希文 于 2021-07-27 设计创作，主要内容包括：本发明涉及抢救装置技术领域,具体为一种急诊内科心脑肺复苏抢救装置,包括抢救装置,所述抢救装置包括担架,且担架的两侧皆安装有绑带；快速连接机构,所述绑带的内部通过快速连接机构连接有夹板,所述快速连接机构包括空腔,且空腔开设在担架的内部,所述空腔内部的两侧皆通过轴承活动连接有轴杆,所述齿轮的两侧皆啮合有齿条板,所述齿条板顶部远离齿轮的一侧安装有连板,所述担架顶部的两侧皆设置有夹板。本发明有效防止了当病患长时间处于救护车内部时,由于外部的环境复杂,可能会产生颠簸,从而导致心肺复苏机可能会在担架上产生晃动位移,使得与需要按压的位置产生偏差,同时也十分的不安全的问题。(The invention relates to the technical field of rescue devices, in particular to a cardio-cerebral-pulmonary resuscitation rescue device for an emergency internal medicine, which comprises a rescue device, wherein the rescue device comprises a stretcher, and two sides of the stretcher are both provided with binding bands; quick-connect mechanism, the inside of bandage is connected with splint through quick-connect mechanism, quick-connect mechanism includes the cavity, and the cavity is seted up in the inside of stretcher, the inside both sides of cavity all have the axostylus axostyle through bearing swing joint, the both sides of gear have all meshed rack plate, one side that the gear was kept away from at rack plate top is installed and is linked the board, the both sides at stretcher top all are provided with splint. The invention effectively prevents the problems that when a patient is in the ambulance for a long time, the external environment is complex and the cardio-pulmonary resuscitation machine is likely to shake and displace on the stretcher due to jolt, so that the position of the cardio-pulmonary resuscitation machine to be pressed deviates, and the cardio-pulmonary resuscitation machine is also quite unsafe.)

1. The utility model provides a rescue device of emergency internal medicine heart cerebral lung resuscitation which characterized in that includes:

the rescue device comprises a stretcher (111), and two sides of the stretcher (111) are provided with binding bands (112);

quick coupling mechanism, the inside of bandage (112) is connected with splint (113) through quick coupling mechanism, quick coupling mechanism includes cavity (211), and cavity (211) are seted up in the inside of stretcher (111), the inside both sides of cavity (211) all have axostylus axostyle (212) through bearing swing joint, and gear (213) are installed on the outside top of axostylus axostyle (212), the both sides of gear (213) all have engaged rack plate (214), one side that gear (213) were kept away from at rack plate (214) top is installed and is linked board (218), and links board (218) and run through cavity (211) and extend to the upper surface of stretcher (111), the both sides at stretcher (111) top all are provided with splint (113), and one side that splint (113) kept away from mutually all is fixed mutually with linked board (218).

2. The emergency internal medicine cardio-cerebral-pulmonary resuscitation rescue device according to claim 1, characterized in that: rack plate (214) are alternating expression and gear (213) mesh mutually, and the below of gear (213) is provided with stop gear, the inside sliding connection of rack plate (214) has first slide bar (215), and the both ends of first slide bar (215) all are fixed with fixed block (216), the upper surface of fixed block (216) all is fixed mutually with cavity (211) inner wall, the outside winding of first slide bar (215) has first spring (217), and the both ends of first spring (217) are fixed on rack plate (214) and fixed block (216).

3. The emergency internal medicine cardio-cerebral-pulmonary resuscitation rescue device according to claim 1, characterized in that: spout (219) have been seted up to the upper surface of stretcher (111), and spout (219) are provided with four groups, four groups spout (219) and the top one-to-one of rack plate (214), the both sides of stretcher (111) all are provided with supplementary supporting mechanism.

4. The emergency internal medicine cardio-cerebral-pulmonary resuscitation rescue device according to claim 2, characterized in that: the limiting mechanism comprises a connecting block (311), the connecting block (311) is located below a gear (213), two sides of the inside of the connecting block (311) are connected with limiting rods (312) in a sliding mode, one end of each limiting rod (312) is provided with a limiting block (313), the outer side of each limiting rod (312) is wound with a second spring (314), two ends of each second spring (314) are fixed to the inner wall of the connecting block (311) and the inner wall of the cavity (211) respectively, two ends of the connecting block (311) are provided with lantern rings (315), a ratchet wheel (316) is arranged inside each lantern ring (315), the ratchet wheel (316) is arranged outside the shaft (212), one side of the inside of each lantern ring (315) is movably connected with a pawl (317) through a rotating shaft, one end of each pawl (317) is clamped with the ratchet wheel (316), a supporting block (319) is arranged inside each cavity (211), and one side of each supporting block (319) is movably connected with a transmission rod (320) through a bearing, one end of the transmission rod (320) penetrates through the cavity (211) and extends to the outer surface of the stretcher (111), a cam (321) is installed on the outer side of the transmission rod (320), and the outer side of the cam (321) is attached to the upper surface of the connecting block (311).

5. The emergency internal medicine cardio-cerebral-pulmonary resuscitation rescue device according to claim 4, characterized in that: the lantern ring (315) is a hollow structure, a baffle (318) is arranged on one side of the pawl (317), the inner wall of the lantern ring (315) is installed on one side of the baffle (318), and the cam (321) is designed in a water drop structure.

6. The emergency internal medicine cardio-cerebral-pulmonary resuscitation rescue device according to claim 1, characterized in that: a head supporting frame (114) is arranged at one end of the top of the stretcher (111), a rubber block (115) is glued to the top of the head supporting frame (114), and the head supporting frame (114) is connected with the clamping plate (113) through an adjusting mechanism.

7. The emergency internal medicine cardio-cerebral-pulmonary resuscitation rescue device according to claim 6, characterized in that: adjustment mechanism includes first regulating plate (411), and first regulating plate (411) installs the both sides at head support frame (114) outer wall, the inside sliding connection of first regulating plate (411) has second regulating plate (412), and the outer wall at splint (113) is installed to the one end of second regulating plate (412), the inside threaded connection of first regulating plate (411) has first bolt (413), and the one end of first bolt (413) and second regulating plate (412) looks butt, slide rail (414) have been seted up to the upper surface of stretcher (111), and the inside swing joint of slide rail (414) has slider (415), the bottom at head support frame (114) is installed at the top of slider (415).

8. The emergency internal medicine cardio-cerebral-pulmonary resuscitation rescue device according to claim 3, characterized in that: supplementary supporting mechanism includes second slide bar (511), and second slide bar (511) install the both sides at stretcher (111) outer wall, the outside sliding connection of second slide bar (511) has sliding sleeve (512), and sliding sleeve (512)'s top installs expansion plate (513), expansion plate (513) comprise lagging and slide, the inside cover of lagging is equipped with the slide, and the inside swing joint of slide has pull rod (514), briquetting (515) are installed to the one end of pull rod (514), the outside winding of pull rod (514) has third spring (516), and the both ends of third spring (516) are installed respectively at slide and pull rod (514) outer wall.

9. The emergency internal medicine cardio-cerebral-pulmonary resuscitation rescue device according to claim 8, characterized in that: the pressing block (515) is glued with a rubber pad on one side close to the pressing block, the rubber pad is designed to be of a wave-shaped structure, a second bolt (517) is connected to the inner thread of the sliding sleeve (512), and one end of the second bolt (517) is abutted to the second sliding rod (511).

Technical Field

The invention relates to the technical field of rescue devices, in particular to a cardio-cerebral-pulmonary resuscitation rescue device for emergency internal medicine.

Background

Sudden cardiac arrest is the most critical emergency in clinic, in the process of treating a patient suffering from sudden cardiac arrest, the chest of the patient needs to be pressed, the patient is subjected to cardio-pulmonary resuscitation, sudden cardiac arrest is caused by various reasons, the effective blood pumping function disappears, severe hypoxia and ischemia of the whole body are caused, the clinical manifestations of palpation cannot be achieved, the pulsation of the aorta and the disappearance of heart sound are achieved, consciousness is lost, respiration is stopped, the pupils are scattered, death can be caused if the death cannot be achieved in time, and when the patient is treated outside a hospital, the patient on a stretcher needs to be subjected to continuous cardio-pulmonary resuscitation by using a cardio-pulmonary resuscitation machine, so that the patient can be rescued for enough time;

but present stretcher is carrying out the in-process of first aid to the disease, because stretcher and cardiopulmonary resuscitation machine are two separated main parts, when the disease is inside the ambulance for a long time, because outside environment is complicated, can produce jolting, thereby lead to cardiopulmonary resuscitation machine to produce on the stretcher and rock the displacement, make and the position that needs to press produce the deviation, reduced ease for use and practicality, also very unsafe simultaneously, consequently need a neotype emergency internal medicine heart cardio pulmonary resuscitation device to solve above-mentioned problem urgently.

Disclosure of Invention

The invention aims to provide a cardio-pulmonary resuscitation rescue device for an emergency internal medicine department, which aims to solve the problem that the cardio-pulmonary resuscitation machine is not safe because the cardio-pulmonary resuscitation machine is likely to shake and move on a stretcher and deviate from a position needing to be pressed due to the fact that the external environment is complex and jolt.

In order to achieve the purpose, the invention provides the following technical scheme: a cardio-cerebral-pulmonary resuscitation rescue device for emergency internal medicine comprises a rescue device, wherein the rescue device comprises a stretcher, and two sides of the stretcher are both provided with binding bands;

quick-connect mechanism, the inside of bandage is connected with splint through quick-connect mechanism, quick-connect mechanism includes the cavity, and the cavity is seted up in the inside of stretcher, the inside both sides of cavity all have the axostylus axostyle through bearing swing joint, and the outside top of axostylus axostyle installs the gear, the both sides of gear have all meshed the rack board, the rack board top is kept away from one side of gear and is installed even board, and even board runs through the upper surface that the cavity extends to the stretcher, the both sides at stretcher top all are provided with splint, and one side that splint kept away from mutually all is fixed mutually with even board.

Further, the rack plate is alternating expression and gear mesh mutually, and the below of gear is provided with stop gear, the inside sliding connection of rack plate has first slide bar, and the both ends of first slide bar all are fixed with the fixed block, the upper surface of fixed block all is fixed mutually with the cavity inner wall, the outside winding of first slide bar has first spring, and the both ends of first spring are fixed respectively on rack plate and fixed block.

Further, the upper surface of the stretcher has been seted up the spout, and the spout is provided with four groups, four groups the spout all is provided with auxiliary stay mechanism with the top one-to-one of rack plate, the both sides of stretcher.

Furthermore, the limiting mechanism comprises a connecting block, the connecting block is positioned below the gear, two sides inside the connecting block are both connected with limiting rods in a sliding manner, and one end of the limiting rod is provided with a limiting block, the outer side of the limiting rod is wound with a second spring, the two ends of the second spring are respectively fixed on the connecting block and the inner wall of the cavity, the two ends of the connecting block are both provided with lantern rings, and a ratchet wheel is arranged in the lantern ring and is arranged outside the shaft lever, one side in the lantern ring is movably connected with a pawl through a rotating shaft, one end of the pawl is clamped with the ratchet wheel, a supporting block is arranged in the cavity, one side of the supporting block is movably connected with a transmission rod through a bearing, one end of the transmission rod penetrates through the cavity and extends to the outer surface of the stretcher, a cam is installed on the outer side of the transmission rod, and the outer side of the cam is attached to the upper surface of the connecting block.

Further, the lantern ring is hollow structural design, one side of pawl is provided with the baffle, and installs at the inner wall of lantern ring one side of baffle, the cam is the design of drop form structure.

Furthermore, a head support frame is arranged at one end of the top of the stretcher, a rubber block is glued to the top of the head support frame, and the head support frame is connected with the clamping plate through an adjusting mechanism.

Further, adjustment mechanism includes first regulating plate, and first regulating plate installs the both sides at head support frame outer wall, the inside sliding connection of first regulating plate has the second regulating plate, and the outer wall at splint is installed to the one end of second regulating plate, the inside threaded connection of first regulating plate has first bolt, and the one end and the second regulating plate looks butt of first bolt, the slide rail has been seted up to the upper surface of stretcher, and the inside swing joint of slide rail has the slider, the bottom at head support frame is installed at the top of slider.

Further, supplementary supporting mechanism includes the second slide bar, and the second slide bar is installed in the both sides of stretcher outer wall, the outside sliding connection of second slide bar has the sliding sleeve, and the top of sliding sleeve installs the expansion plate, the expansion plate comprises lagging and slide, the inside cover of lagging is equipped with the slide, and the inside swing joint of slide has the pull rod, the briquetting is installed to the one end of pull rod, the outside winding of pull rod has the third spring, and the both ends of third spring are installed respectively at slide and pull rod outer wall.

Furthermore, a rubber pad is glued on one side, close to the pressing block, of the pressing block, the rubber pad is in a wave-shaped structural design, a second bolt is connected to the inner thread of the sliding sleeve, and one end of the second bolt is abutted to the second sliding rod.

Compared with the prior art, the invention has the beneficial effects that:

1. through the arrangement of the quick connecting mechanism and the limiting mechanism, under the meshing action of the gear and the rack plate, when the clamping plate on one side is pulled to fix the cardiopulmonary resuscitation machine, the clamping plate on the other side is moved to quickly connect and fix the cardiopulmonary resuscitation machine, so that the time is greatly saved, when the hospital is reached, the transmission rod is rotated, the cam is used for extruding the connecting block, the clamping between the pawl and the ratchet wheel is released, the clamping plate is quickly reset, the cardiopulmonary resuscitation machine is relieved and limited, the usability and the practicability are improved, the rescue time of a patient is greatly strived while the on-site installation time is reduced, and the situation that the patient is in the ambulance for a long time and jolt possibly due to the complex external environment is effectively prevented, so that the cardiopulmonary resuscitation machine can shake and displace on the stretcher, so that the position deviation of the pressing device and the pressing position is generated, and the safety problem is very unsafe.

2. Through being provided with auxiliary stay mechanism, support fixedly through the briquetting to cardiopulmonary resuscitation machine's both sides, avoid when the vehicle jolts, cardiopulmonary resuscitation machine produces the displacement and slides, make the position of pressing produce the deviation, and under the effect through second slide bar and sliding sleeve, be convenient for carry out synchronous and asynchronous regulation to the briquetting of both sides, carry out self-adaptation regulation according to the cardiopulmonary resuscitation machine of difference, the ease for use and practicality have been improved, secondly under the effect through the rubber pad, frictional force has been increased, avoid producing the pine and take off.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a left side top perspective view of the present invention;

FIG. 2 is a schematic diagram of a right side top perspective view of the present invention;

FIG. 3 is a schematic diagram of a left side top partial perspective view of the present invention;

FIG. 4 is a schematic left side top perspective cross-sectional view of the present invention;

FIG. 5 is a schematic perspective view of the quick connect mechanism of the present invention;

FIG. 6 is a schematic perspective view of a spacing mechanism according to the present invention;

FIG. 7 is a schematic top view of a portion of the limiting mechanism of the present invention;

FIG. 8 is a schematic view of a partial top perspective structure of the spacing mechanism of the present invention;

FIG. 9 is a schematic perspective view of an adjustment mechanism according to the present invention;

FIG. 10 is a perspective view of the auxiliary supporting mechanism of the present invention;

fig. 11 is a perspective view of the cardiopulmonary resuscitation device of the present invention in a clamped state.

In the figure: 111. a stretcher; 112. binding bands; 113. a splint; 114. a head support; 115. a rubber block; 211. a cavity; 212. a shaft lever; 213. a gear; 214. a rack plate; 215. a first slide bar; 216. a fixed block; 217. a first spring; 218. connecting plates; 219. a chute; 311. connecting blocks; 312. a limiting rod; 313. a limiting block; 314. a second spring; 315. a collar; 316. a ratchet wheel; 317. a pawl; 318. a baffle plate; 319. a support block; 320. a transmission rod; 321. a cam; 411. a first adjusting plate; 412. a second adjusting plate; 413. a first bolt; 414. a slide rail; 415. a slider; 511. a second slide bar; 512. a sliding sleeve; 513. a retractable plate; 514. a pull rod; 515. briquetting; 516. a third spring; 517. and a second bolt.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-11, an embodiment of the present invention: a cardio-cerebral-pulmonary resuscitation rescue device for an emergency internal medicine comprises a rescue device, wherein the rescue device comprises a stretcher 111, and two sides of the stretcher 111 are provided with binding bands 112;

quick-connect mechanism, the inside of bandage 112 is connected with splint 113 through quick-connect mechanism, quick-connect mechanism includes cavity 211, and cavity 211 sets up the inside at stretcher 111, the inside both sides of cavity 211 all have axostylus axostyle 212 through bearing swing joint, and gear 213 is installed on the outside top of axostylus axostyle 212, gear 213's both sides all have engaged with rack plate 214, one side that gear 213 was kept away from at rack plate 214 top is installed and is linked board 218, and link board 218 runs through the upper surface that cavity 211 extended to stretcher 111, the both sides at stretcher 111 top all are provided with splint 113, and one side that splint 113 kept away from mutually all is fixed mutually with link board 218.

Rack board 214 is the alternating expression and meshes mutually with gear 213, and gear 213's below is provided with stop gear, rack board 214's inside sliding connection has first slide bar 215, and first slide bar 215's both ends all are fixed with fixed block 216, the upper surface of fixed block 216 all is fixed mutually with cavity 211 inner wall, first slide bar 215's outside winding has first spring 217, and the both ends of first spring 217 are fixed respectively on rack board 214 and fixed block 216, it is spacing to rack board 214 under the effect through first slide bar 215, avoid rack board 214 to produce the skew, secondly under the effect through first spring 217, be convenient for carry out quick release spacing to cardiopulmonary resuscitation machine, the ease for use and practicality have been improved.

The upper surface of stretcher 111 has been seted up spout 219, and spout 219 is provided with four groups, four group's spouts 219 and the top one-to-one of rack plate 214, and the both sides of stretcher 111 all are provided with supplementary supporting mechanism, through the effect of spout 219, are convenient for link plate 218 and remove the operation, make things convenient for medical staff to install fixedly cardiopulmonary resuscitation machine, avoid fixing the best rescue time who delays the disease for a long time.

The limiting mechanism comprises a connecting block 311, the connecting block 311 is positioned below the gear 213, two sides inside the connecting block 311 are both connected with a limiting rod 312 in a sliding manner, one end of the limiting rod 312 is provided with a limiting block 313, the outer side of the limiting rod 312 is wound with a second spring 314, two ends of the second spring 314 are respectively fixed on the connecting block 311 and the inner wall of the cavity 211, two ends of the connecting block 311 are both provided with a lantern ring 315, a ratchet wheel 316 is arranged inside the lantern ring 315, the ratchet wheel 316 is arranged outside the shaft rod 212, one side inside the lantern ring 315 is movably connected with a pawl 317 through a rotating shaft, one end of the pawl 317 is clamped with the ratchet wheel 316, a supporting block 319 is arranged inside the cavity 211, one side of the supporting block 319 is movably connected with a transmission rod 320 through a bearing, one end of the transmission rod 320 penetrates through the cavity 211 and extends to the outer surface of the stretcher 111, the outer side of the transmission rod 320 is provided with a cam 321, and the outer side of the cam 321 is jointed with the upper surface of the connecting block 311, the action of the ratchet wheel 316 is limited by the pawl 317, so that the ratchet wheel 316 can only rotate in one direction, and the clamping plate 113 is convenient to limit.

The lantern ring 315 is designed to be a hollow structure, a baffle 318 is arranged on one side of the pawl 317, one side of the baffle 318 is installed on the inner wall of the lantern ring 315, the cam 321 is designed to be a drop-shaped structure, and the connecting block 311 is pressed downwards conveniently under the action of the cam 321, so that the limit of the ratchet wheel 316 is released.

A head supporting frame 114 is arranged at one end of the top of the stretcher 111, a rubber block 115 is glued to the top of the head supporting frame 114, and the head supporting frame 114 is connected with the clamping plate 113 through an adjusting mechanism.

The adjusting mechanism comprises a first adjusting plate 411, the first adjusting plate 411 is installed on both sides of the outer wall of the head support frame 114, a second adjusting plate 412 is slidably connected inside the first adjusting plate 411, and one end of the second adjusting plate 412 is installed at the outer wall of the clamping plate 113, a first bolt 413 is threadedly coupled to the inside of the first adjusting plate 411, one end of the first bolt 413 is abutted against the second adjusting plate 412, the upper surface of the stretcher 111 is provided with a slide rail 414, and the slide rail 414 is movably connected with a slide block 415 inside, the top of the slide block 415 is installed at the bottom of the head support frame 114, under the action of the first adjusting plate 411 and the second adjusting plate 412, the position of the head support frame 114 can be conveniently adjusted, and under the fixing action between the second adjusting plate 412 and the clamping plate 113, the clamping of the equipment is facilitated, the position of the head support 114 can be adjusted to facilitate synchronous adjustment of the head support 114 and chest position.

The auxiliary supporting mechanism comprises a second sliding rod 511, the second sliding rod 511 is installed on two sides of the outer wall of the stretcher 111, the outer side of the second sliding rod 511 is slidably connected with a sliding sleeve 512, a telescopic plate 513 is installed at the top of the sliding sleeve 512, the telescopic plate 513 is composed of a sleeve plate and a sliding plate, a sliding plate is sleeved inside the sleeve plate, a pull rod 514 is movably connected inside the sliding plate, a pressing block 515 is installed at one end of the pull rod 514, a third spring 516 is wound outside the pull rod 514, two ends of the third spring 516 are installed on the outer walls of the sliding plate and the pull rod 514 respectively, under the action of the second sliding rod 511 and the sliding sleeve 512, the position of the pressing block 515 can be conveniently adjusted, the two sides of the device can be conveniently supported and fixed, the rotation of the device is reduced, the stability is improved, and the device is prevented from being deviated.

The rubber pads are glued to one side, close to each other, of the pressing block 515, the rubber pads are designed to be of a wave-shaped structure, the second bolt 517 is connected to the inner threads of the sliding sleeve 512, one end of the second bolt 517 is connected with the second sliding rod 511 in a butting mode, friction force between the sliding sleeve and the two sides of the device is increased through the wave-shaped design, and usability and practicability are improved.

The working principle is as follows: when the heart-lung resuscitator is used, the heart-lung resuscitator is placed on the upper surface of the stretcher 111, and then the clamping plate 113 is pulled, so that the connecting plate 218 is driven to move, the rack plates 214 and the gears 213 are meshed, the rack plates 214 on the two sides are synchronously moved, when the rack plates 214 move, the first springs 217 generate elastic deformation, the clamping plate 113 is limited under the clamping action of the ratchet wheel 316 and the pawl 317, the heart-lung resuscitator is clamped and fixed, and displacement and sliding are avoided;

when the two sides of the cardiopulmonary resuscitation machine need to be supported and buffered, firstly, under the action of the sliding connection between the second sliding rod 511 and the sliding sleeve 512, the position of the sliding sleeve 512 is adjusted, the second bolt 517 is twisted to be limited after the adjustment is completed, then the pull rod 514 is pulled, so that the expansion plate 513 performs telescopic motion, the press block 515 is aligned to the two sides of the cardiopulmonary resuscitation machine, the pull rod 514 is pushed under the action of the third spring 516, and the cardiopulmonary resuscitation machine is clamped and supported;

when the limit of the cardiopulmonary resuscitator needs to be relieved, the transmission rod 320 is firstly rotated, the transmission rod 320 extrudes the connecting block 311, the second spring 314 generates elastic deformation, the connecting block 311 moves downwards, the pawl 317 and the pawl 317 are driven to be separated, the limit of the clamping plate 113 is relieved, the rack plate 214 is pushed under the restoring force action of the first spring 217, the rack plate 214 is quickly restored to the original position, the limit of the cardiopulmonary resuscitator is relieved, and the operation is finished.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.