DK174914B1

DK174914B1 - Capture mechanism for lifts and lifting devices

Info

Publication number: DK174914B1
Application number: DK198706476A
Authority: DK
Inventors: Rolf Sundstroem; Gunnar Sundstroem
Original assignee: Motala Portautomatik Broederna
Priority date: 1986-12-10
Filing date: 1987-12-09
Publication date: 2004-02-16
Also published as: DK647687A; SE461587B; NO165831B; FI85844B; FI85844C; FI875384A; NO875124D0; FI875384A0; NO165831C; NO875124L; SE8605292D0; SE8605292L; DK647687D0

Description

DK 174914 B1DK 174914 B1

Den foreliggende opfindelse angår en fangmekanisme som anført i patentkrav 1 's indledende del.The present invention relates to a catch mechanism as set forth in the preamble of claim 1.

Fangmekanismer er velkendte fra såvel elevatorer som kraner og har til for-5 mål at forhindre elevatorstolens respektiv lastens hurtige fald nedad ved eventuelle fejl på løftemekanismer og/eller bremser. De kendte fangmekanismer, som findes, er såvel forholdsvis komplicerede som dyre, eftersom de skal opfylde meget højt stillede krav til pålideligheden. Dette har ikke så stor betydning for normale og store elevatorer respektiv for kraner, eftersom om-10 kostningerne her i øvrigt er så tilpas store, at en mere eller mindre dyr fangmekanisme ikke gør den store forskel. Når det gælder mindre elevatorer som eksempelvis trappeelevatorer til en person eller lignende, så er de eksisterende løsninger så dyre, at elevatoren total set fordyres uacceptabelt meget.Capture mechanisms are well known from elevators as well as cranes and have the object of preventing the elevator chair and the load from falling downwards rapidly in the event of any failure of lifting mechanisms and / or brakes. The known capture mechanisms that exist are both relatively complicated and expensive, as they must meet very high standards of reliability. This is of little importance to normal and large elevators or to cranes, since the costs here are otherwise so large that a more or less expensive catching mechanism does not make the big difference. When it comes to smaller lifts such as stair lifts for a person or similar, the existing solutions are so expensive that the elevator is in general unacceptably expensive.

15 Fra FR offentliggørelsesskrift nr. 2341513 kendes en fangmekanisme af den indledningsvis nævnte art. Denne mekanisme omfatter imidlertid relativt mange enkelte konstruktionselementer og er derfor kompliceret og dyr at fremstille. Brugen af fjedre I konstruktionen medfører desuden risiko for brud på disse og en deraf følgende forringet sikkerhed under anvendelse.15 From FR Publication No. 2341513, a catch mechanism of the kind mentioned above is known. However, this mechanism comprises relatively many individual structural elements and is therefore complicated and expensive to manufacture. The use of springs In the design also causes the risk of breakage of these and a consequent deterioration of safety during use.

20 Nærværende opfindelse har derfor til formål, at angive en fangmekanisme, som især kan anvendes til enkle og mindre elevatorer og løfteindretninger eller naturligvis i andre tilfælde, når en pålidelig og billig fangmekanisme be- høves.It is therefore an object of the present invention to provide a catching mechanism which can be used especially for simple and smaller lifts and lifting devices or, of course, in other cases when a reliable and inexpensive catching mechanism is needed.

2525

Formålet med opfindelsen opnås ved at indrette fangmekanismen som angivet i patentkrav 1’s kendetegnende del.The object of the invention is achieved by arranging the capturing mechanism as set forth in the characterizing part of claim 1.

Der er således angivet en fangmekanisme, der som følge af en enkel kon-30 struktion har lave fremstillingsomkostninger. Den enkle sammenkobling af en % DK 174914 B1 2 medbringerdel og et stempel uden anvendelse af fjedre giver desuden en forøget brugersikkerhed.Thus, a capturing mechanism is provided which, due to its simple construction, has low manufacturing costs. Furthermore, the simple coupling of a% DK 174914 B1 2 carrier part and a piston without the use of springs provides increased user safety.

Opfindelsen skal i det følgende forklares nærmere under henvisning til teg-5 ningen, hvor ' figur 1 og 2 viser et tandhjulsdrev i en elevator af ikke nærmere vist art i to stillinger omfattende fangmekanismen ifølge opfindelsen, og 10 figur 3 viser et snit gennem de i figurerne 1 og 2 viste drev omfattende fangmekanismen.BRIEF DESCRIPTION OF THE DRAWINGS In the following, the invention will be explained in more detail with reference to the drawing, in which: Figures 1 and 2 show a gear drive in an elevator of not shown in two positions comprising the catching mechanism according to the invention, and Figure 3 shows a section through the Figures 1 and 2 illustrate drives comprising the capture mechanism.

Den på tegningen (fig. 3) viste fangmekanisme udgøres af en rørbøsning 1, som er monteret på et kædedrivhjul 2 koaksialt med bøsningen. I rørbøsnin-15 gen er der udformet diametrale udsparinger 3, der 1 tværsnit er en smule større end et stempel 4.1 det viste tilfælde er udsparingerne 3 fræset ud som et tværgående spor I bøsningen l’s væg. Derefter er der fastsvejset en ring 5 på bøsningens udvendige endeflade. I den diametralt dannede kanal eller det diametralt udformede hul 3 kan stemplet 4 forskydes frem og tilbage. Det 20 fastholdes dog i sporet 3 ved hjælp af en bolt 6, som skrues i stemplet, når dette er anbragt inden for ringen 5. Herved kan stemplet bevæge sig mellem endestillinger, hvor bolten 6 er i anlæg med ringen 5.The catch mechanism shown in the drawing (Fig. 3) is constituted by a pipe sleeve 1 which is mounted on a sprocket 2 coaxially with the bushing. In the pipe bushing, diametrical recesses 3 are formed, 1 cross-section slightly larger than a piston 4.1. In the case shown, the recesses 3 are milled out as a transverse groove in the wall of the bushing 1. Then a ring 5 is welded to the outer end surface of the sleeve. In the diametrically formed channel or the diametrically formed hole 3, the piston 4 can be moved back and forth. However, the 20 is retained in the groove 3 by means of a bolt 6, which is screwed into the piston when it is placed within the ring 5. This allows the piston to move between end positions where the bolt 6 is in contact with the ring 5.

Kædedrivhjulet 2 er ved anvendelsen monteret lodret, således at stemplet 4 25 følger med rotationen, når tandhjulet, ved eksempelvis elevatorens bevægelse, roterer, men stemplet falder hele tiden ned under indvirkning af tyngdekraften for derved at indtage sin nedre stilling (fig. 1). Dette gælder, så længe kædedrivhjulet bevæger sig med en rimelig hastighed. Hvis hastigheden øges, bliver centrifugalkraften I stemplet så stor, at stemplet fastholdes i den 30 på fig. 1 viste udskudte stilling, og 1 denne når stemplet op til et stop 7, som er anbragt oven over kædedrivhjulet (fig. 2).In use, the sprocket 2 is mounted vertically so that the piston 4 follows the rotation as the gear, for example by the movement of the elevator, rotates, but the piston continually falls under the influence of gravity to thereby take its lower position (Fig. 1). This is true as long as the sprocket wheel moves at a reasonable speed. If the speed is increased, the centrifugal force I becomes plunger so large that the plunger is retained in the plunger 30 of FIG. 1, and this one reaches the piston up to a stop 7 located above the sprocket (Fig. 2).

DK 174914 B1 3DK 174914 B1 3

Praktiske forsøg har vist, at fangmekanismen ifølge det ovenstående udføringseksempel reagerer så hurtigt, at tandhjulsdrevet stoppes inden en halv omdrejning.Practical experiments have shown that, according to the above embodiment, the catch mechanism responds so quickly that the gear drive is stopped before half a turn.

f 5 I det viste tilfælde er stoppet anbragt på en sådan måde, at det kun stopper for hurtig bevægelse i en retning. Hvis det ønskes, kan stop naturligvis anbringes symmetrisk, således at der dannes stop for hurtig rotation I begge omdrejningsretninger.f 5 In the case shown, the stop is arranged in such a way that it stops only for rapid movement in one direction. Of course, if desired, stops can be arranged symmetrically so that stops for rapid rotation are formed in both directions of rotation.

10 Efter udbredreisen af fejl, som har fået fangmekanismen til at blokere elevatorbevægelsen, kan mekanismen igen let frigøres ved bevægelse I modsat retning, hvorefter den umiddelbart træder i funktion igen. Inden for opfindelsens rammer kan man ligeledes tænke sig andre udformninger af stemplet, der eksempelvis kan være korsformet.10 After the propagation of faults which have caused the trapping mechanism to block the elevator movement, the mechanism can again be easily released by movement in the opposite direction, after which it immediately becomes operational again. Within the scope of the invention, other designs of the piston may also be conceived, which may, for example, be cruciform.

1515

Fangmekanismen kan hensigtsmæssigt anbringes direkte i forbindelse med en tovtromle eller et kædehjul til en bærende kæde.Conveniently, the catch mechanism may be placed directly in connection with a rope drum or sprocket for a bearing chain.

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Claims

A catch mechanism having a first carrier portion (1) rotatable about a horizontal shaft and a second portion (4) arranged in with the carrier portion (1) * 5 for movement therewith, the second portion (4) being movable relative to the carrier portion (1). 1) towards and away from a stop (7) fixedly fixed to the carrier part (1) and arranged to engage the stop (7) characterized by a centrifugal force held in the carrier part by the centrifugal force; the stop (7) being arranged above the carrier part (1), that the second part is constituted by a diametrically extending piston (4) which is mounted in corresponding diametrically opposite openings in the carrier part (1) and is freely slidable in a range of diametrically moving opposite end positions defined by a screw (6) inserted into the center 15 of the piston and adapted to abut the inner walls of the carrier portion (1).