SE501039C2

SE501039C2 - Hoist

Info

Publication number: SE501039C2
Application number: SE9300816A
Authority: SE
Inventors: Tomas Ahlrot
Original assignee: Samhall Rehab Ab
Priority date: 1993-03-09
Filing date: 1993-03-09
Publication date: 1994-10-24
Also published as: WO1994020405A1; SE9300816L; AU6225494A; SE9300816D0

Abstract

The disclosure relates to a lifting apparatus comprising a first scissor pair (20) formed by first arms (22a, b) which are rotatably journalled in one another in a journal (24), and a second scissor pair (21) formed by second arms (23a, b) which are rotatably journalled in one another in a journal. A frame (30) is carried by the two scissor pairs. The upper and lower end portions of opposing arms of the scissor pairs are interconnected with first and second upper crossbars (26, 28) and first and second lower crossbars (27, 29). A prime mover (15, 16) is rotatably connected via an arm (36) to a sleeve-like device (37), which is rotatably disposed about the first lower crossbar (29). A mechanical transmission device (43, 45) is fixed to the sleeve (37) in an angular relationship to the arm of the sleeve, the transmission device (43, 45) being disposed in order to abut, with the frame in its lowermost position, against an arrest member (41) provided on upper end portions of a first scissor arm (22a) and a second scissor arm (23a) located above the sleeve (37), in order, on lifting of the frame (30) to exercise an upwardly directed force against the arrest member (41), this force being created by the momentum the sleeve (37) transmits to the mechanical transmission device (43, 45) on rotation of the sleeve (37) by the prime mover (15, 16).

Description

501 039 10 15 20 25 30 2 fig 4 a,b en deta1j 1 perspektivvy av ena ändområdet hos anordningens saxorgan och fig 5 en deta1j 1 perspektivvy av det andra ändområdet hos anordningens saxorgan. Fig. 4 a, b is a detailed perspective view of one end region of the scissor means of the device and Fig. 5 is a detailed perspective view of the other end region of the scissor means of the device.

I figurerna visas ett chassi 10 med 1ängsgående ba1kar och tvärgående baïkar. Hjuï 14 uppbär 1 den visade utföringsformen chassit 10. En motor 15 och en drag- och skjutstång 16 är infästade 1 chassit.The figures show a chassis 10 with longitudinal beams and transverse beams. Hjuï 14 supports in the embodiment shown the chassis 10. A motor 15 and a drawbar and push rod 16 are attached to the chassis.

Ett första saxpar 20 bi1dat av första armar 22a.22b och ett andra saxpar 21 bi1dat av andra armar 23a,23b uppbär en ram 30 på v11ken är anordnat fästorgan 31 vid användning av kopp11ng av ramen. exempe1vis t111 ett 1yftbord e11er t111 en säng. Ett första (övre) tvärstag 26 förbinder de motstä11da armarna 22a.23a och ett andra (övre) tvärstag 28 de motstä11da armarna 22b,23b 1 armarnas ena ändområden. Ett tredje (undre) tvärstag 27 förbinder de motstä11da armarna 22a,23a och ett fjärde (undre) tvärstag 29 de motstä11da armarna 22b.23b 1 deras andra ändområden. En 1agr1ng 24 förbinder vridbart de första armarna med varandra och en 1agr1ng 25 förbinder vridbart de andra armarna med varandra för att b11da saxparen 20 resp 21.A first pair of scissors 20 formed by first arms 22a.22b and a second pair of scissors 21 formed by second arms 23a, 23b support a frame 30 on which fastening means 31 are provided when coupling the frame. for example t111 a 1 lift table or t111 a bed. A first (upper) cross bar 26 connects the opposing arms 22a.23a and a second (upper) cross bar 28 the opposing arms 22b, 23b in one end region of the arms. A third (lower) cross bar 27 connects the opposing arms 22a, 23a and a fourth (lower) cross bar 29 the opposing arms 22b.23b in their other end regions. A base 24 rotatably connects the first arms to each other and a base 25 rotatably connects the second arms to each other to form the pair of scissors 20 and 21, respectively.

Tvärstagen är parvis 26.29:27.28 beïägna ovanför varandra 1 vertika11ed på var sin sida om saxparens 1agringar 24,25. Ett 26,29 av sagda par av tvärstag är roterbart 1agrade 1 chassit 10 resp 1 ramen 30. Resterande par 27,28 av tvärstag är förfïyttbart ans1utna ti11 chassit 10 och ramen 30. Den bana 1 v11ken tvärstagen förf1yttas är 1 huvudsak riktad tvärs ramens förf1yttningsriktn1ng. De fixerade roterbara 1agr1ngarna för de i chassit resp 1 ramen fixerade tvärstagen 29 resp 26 benämns 1b1and fjärde tvärstag resp första tvärstag och är anordnade 1 roterbara 1agringar 35 resp 32. De förskjutbara 1agringarna för de t111 chassit resp t111 ramen kopp1ade tvärstagen 27 resp 28 benämns ib1and tredje tvärstag resp andra tvärstag och förf1yttas 1 chassit 1 banor 33 och 1 ramen 1 samverkan med banor 34. 10 15 20 25 30 35 501 039 Drivorganet 15.16 är via en arm 36 vridbart ansïutet ti11 en hyïsa 37 som är vridbart anordnad på det fjärde tvärstaget 29. Ett snett uppåt riktat mekaniskt överföringsorgan 43.45 i figur 3 visat som en stång 43 och ett ïängst ut på stången anordnat anïiggningsorgan 45 är fixerat ti11 hyisan 37. Det mekaniska överföringsorganet är anordnat i ett i förväg bestämt vinkeïförhåïïande ti11 hyïsans arm 36 där vinkeïns stor- 1ek är anpassad efter det moment som eftersträvas i samband med vrid- ning av hyïsan i förhåïïande ti11 det fjärde tvärstaget.The transverse struts are in pairs 26.29: 27.28 located one above the other in a vertical line on each side of the pair of scissors 1, 24,25. A 26,29 of said pair of crossbars is rotatably 1-stroke 1 chassis 10 and 1 frame 30 respectively. The remaining 27,28 pairs of crossbars are movably connected to the chassis 10 and the frame 30. The path in which the crossbars are moved is mainly directed transversely to the displacement direction of the frame. . The fixed rotatable abutments for the crossbars 29 and 26 fixed in the chassis and the frame, respectively, are called the fourth crossbars and the first crossbars, respectively, and are arranged in rotatable bearings 35 and 32, respectively. third crossbar and second crossbars and are moved 1 chassis 1 tracks 33 and 1 frame 1 in cooperation with tracks 34. The drive means 15.16 is rotatably connected via an arm 36 to a housing 37 which is rotatably arranged on the fourth crossbar. 29. An obliquely upwardly directed mechanical transfer means 43.45 in Figure 3 is shown as a rod 43 and an attachment means 45 arranged furthest on the rod is fixed to the housing 37. The mechanical transfer means is arranged in a predetermined angle relative to the large arm of the housing 36 where the angle angle - 1ek is adapted to the torque sought in connection with the rotation of the housing in relation to the fourth crossbar.

När anordningens ram befinner sig i sitt 1ägsta ïäge påbörjas uppiyft- ningen av ramen därigenom att drivorganet 15,16 drar stången 16 åt vänster i figurerna. varvid hyisan 37 vrids kring tvärstaget 29.When the frame of the device is in its original position, the lifting of the frame is started by the drive means 15, 16 pulling the rod 16 to the left in the figures. wherein the hoist 37 is rotated about the cross member 29.

Stången är Tedat infäst ti11 hylsan via armen 36. Vid vridningen av hyïsan förfïyttas den uppåtriktade stången 43 i riktning från driv- organet varvid stången med ansïutet överföringsorgan 45 genom över- föringsorganets anïiggning mot ansïagsorganet 41 utövar en uppåt riktad kraft mot detta. Härigenom åstadkoms den eftersträvade ökningen av iyftkraften i begynneiseskedet av ramens uppïyftning från sin nedersta position. Under fortsatt vridning av hyïsan sker en successiv ökning av vinke1n me11an saxparens armar varigenom den vertikaïa kraftkomposant som påverkar ramen och som är en föïjd av drivorganets dragkraft på det fjärde tvärstaget ökar. Så småningom antar kraftkomposanten ett så stort värde att den av saxparen utövade ïyftningen av ramen kan ske utan kompïetterande kraftbidrag från överföringsorganet 45.The rod is Tedat attached to the sleeve via the arm 36. When the housing is rotated, the upwardly directed rod 43 is moved in the direction of the drive means, the rod with the indicated transfer means 45 exerting an upwardly directed force thereon by the transfer of the transfer means towards the stop means 41. In this way, the desired increase of the lifting force in the initial stage of the lifting of the frame from its lowest position is achieved. During continued rotation of the housing, a gradual increase of the angle between the arms of the scissors takes place, whereby the vertical force component which affects the frame and which is a result of the traction force of the drive means on the fourth crossbar increases. Eventually, the force component assumes such a large value that the lifting of the frame exerted by the pair of scissors can take place without compensating force contribution from the transfer means 45.

Ett ansïagsorgan 44 är anordnat på tvärstaget 29 för att stoppa stång- ens 43 rotation när det ej krävs kompïetterande kraftbidrag från över- föringsorganet 43.45. Hyisans 37 rotation runt det tiiï drivorganet koppïade tvärstaget 29 upphör såïedes vid kontakt med ansïagsorganet 44. Detta stopp sker tidigast när vinkeïn me11an armarna 22a.22b resp 23a.23b i saxparen 20,21 är ca 200 och sker företrädesvis när vinkeïn är ca 250.An abutment member 44 is provided on the cross member 29 to stop the rotation of the rod 43 when no compensating force contribution from the transfer member 43.45 is required. The rotation of the hoist 37 about the transverse rod 29 coupled to the drive means thus ceases upon contact with the stop means 44. This stop occurs at the earliest when the angle between the arms 22a.22b and 23a.23b in the pair of scissors 20,21 is about 200 and preferably occurs when the angle is about 250.

Ovanstående detaijbeskrivning har endast refererat ti11 ett begränsat antaï utföringsformer av uppfinningen. men det inses ïätt av fackmannen att uppfinningen inrymmer ett stort antaï utföringsformer inom ramen för de efterföïjande patentkraven.The above detailed description has referred only to a limited number of embodiments of the invention. but it will be appreciated by those skilled in the art that the invention encompasses a wide variety of embodiments within the scope of the appended claims.

Claims

1. 501 039 10 15 20 25 30 35 REQUIREMENTS Lifting device comprising a first pair of scissors (20) formed by first arms (22a, 22b) rotatably mounted in each other in a bearing (24). a second pair of scissors (21) formed by second arms (23a.23b) rotatably mounted in each other in a bearing (25), a frame (30) supported by said first and second pair of scissors. a first and a second cross bar (26 and 28, respectively) connecting the upper end portions of opposite arms of the pair of scissors to each other, a third and fourth cross bar (27 and 29, respectively) connecting the lower end portions of opposite arms of the pair of scissors to each other. wherein the cross struts in pairs (26,29: 27,28) are located one above the other in a vertical direction on each side of the bearings (24.25) and one (26,29) of said pair of cross struts is in the middle one (35) in a chassis (10 ) and in a bearing (32) fixed in the frame (30) connected to said chassis and frame, respectively, and the other (27, 28) of said pair of cross struts is connected to tracks (33) arranged in the chassis (10) and the frame (30), respectively. , 34) for the displacement of the crossbars across the direction of advance of the frame and where a drive means (15, 16) is arranged to move the third crossbar (27) across the direction of movement of the frame. characterized in that the drive means (15.16) is rotatably connected to a housing-like member (37) which is rotatably arranged around the fixed cross member (29). that a transfer means (43, 45) is fixed to the sleeve and that the transfer means (43.45) is arranged to abut with the frame in its lower position against at least one stop means (41) arranged on ends of the scissor arms (22a) located above the sleeve. , 23a) whereby upon lifting the frame the transfer means applies an upward force against the stop means (41) caused by the moment of movement of the sleeve transmitting to the mechanical transfer means when the drive means rotates the sleeve. Device according to claim 1, characterized in that the drive means (15.16) is connected to the sleeve via an arm (36). Device according to claim 2, characterized in that the transfer means (43, 45) is an obliquely upwardly directed mechanical transfer means (43, 45) which is fixed in an angular relationship to the sleeve arm (36). Device according to any one of claims 1-3. characterized in that a stop means (44) is arranged on the cross member (29) coupled to the drive means and that the housing (37) or a mechanical member (38) mounted on the housing, upon rotation of the housing, abuts against the stop means whereby the rotation of the housing is relative. the crossbar (29) ceases. Device according to claim 4, characterized in that the mechanical member (38) or the sleeve (37) is so positioned that upon upward movement of the frame it occurs at the earliest when the angle between the arms (22a, 22b and 23a, 23b) in the shears ( 20,21) is about 20 ° and preferably occurs when the angle is about 25 °.