FI56813C - DRIVSKIVEHISS - Google Patents

Description

«5l5r * l ΓβΊ (111 ADVERTISEMENT PUBLICATION

LJ UTLÄGG NI N GSSKRI FT B 6 8 1 3 C (45) Pa ten 11 i ··: y o n r. · Tty 10: 4 19.3 3 Patent applications T (51) Kv.ik. * / Int.ci. * B 66 B 11/08 FINLAND —FINLAND (H) Patent application - Patentantöknlng 78 3608 (22) Hakemispilvi —Anseknlnjadaj 2 * + .11.78 ^ * (23) AlkupUvi — Giltlghatsdag 06.07.76

(41) Made public - Bllvlt offentllg gij. ] _] _ jQ

National Board of Patents and Registration .... t, .....

*, (44) Date of dispatch and of issue of the publication. -

Patent- och registerstyrelsen 7 AnsBkan utlagd och utl. * Krift «n publlc« nd 31.12.79 (32) (33) (31) Requested privilege — Begird prloritet (71) Kone Osakeyhtiö, Munkkiniemen Puistotie 25, 00330 Helsinki 33,

Suomi-Finland (FI) (72) Urho Heikkinen, Helsinki, Suomi-Finland (Fl) (7 * +) Oy Heinänen Ab (5 * 0 Traction elevator - Drivskivehiss (62) Separated by application 751562 - Utbruten frän ansökan 751562

The invention relates to a traction sheave elevator comprising a drive mechanism and a traction sheave with a rope groove connected thereto, through which a hoisting rope is guided, a hoisting car suspended on a hoisting rope and its counterpart, and in crosswise by means of at least one deflection wheel.

Such a traction night elevator is already known, for example, from German patent publication 818 250. In this known solution, the gripping angle is 3/4 of a turn, i.e. 270 °. However, this solution has major drawbacks. The solution is made practically impossible by the fact that the intersection of the hoisting ropes comes too close to the traction sheave. In this case, the free length of the hoisting ropes, measured from the point of intersection to the point of contact of the traction sheave, is only equal to the radius of the traction sheave. With traction wheels of the size normally used, the hoisting ropes must be guided vigorously away from the plane of the traction sheave to prevent abrasion. The deviation formed by the min, i.e. the rope angle, becomes very large. In practice, does a three-degree rope angle cause lifting ropes and traction sheave / high wear that cannot be allowed in personal lifts at all.

In order to reduce the rope angle sufficiently, German patent publication 818 250 should have twice the diameter of the traction sheave compared to those normally used. This, in turn, would result in a doubling of the secondary torque applied to the gear. At the same time, the weight of the traction sheave and gear unit required then increases, and the drive motor must then also be considerably larger. As a result, the cost of machinery will almost double.

The object of the present invention is to eliminate the above-mentioned drawbacks and to provide a new type of traction sheave elevator. The invention is characterized in that the grip angle between the traction sheave and the hoisting rope is between 210 ° and 250 °, whereby the free length of the hoisting ropes, measured from their intersection to the traction sheave contact point, is 1.9 to 0.7 times the traction sheave diameter.

With the aid of the invention, the grip angle and at the same time the friction between the traction sheave and the hoisting rope can be increased without side effects. The masses of the elevator car and the counterweight can be reduced, which means that even smaller and cheaper drive mechanisms can be used. Crucial to the invention is a well-defined grip angle range of 2100-250 °.

According to a preferred embodiment, the grip angle between the traction sheave and the hoisting rope is 235 °, whereby the free length of the hoisting ropes, measured from their intersection to the point of contact of the traction sheave, is equal to the diameter of the traction sheave. The rope angle is then about one degree. As a result, the age of the hoisting rope and the traction sheave increases quite decisively, so that the use of machinery in an apartment building elevator becomes possible.

The invention will now be described by way of example with reference to the accompanying drawing, in which -3-56813

Figure 1 shows a side view of a slack traction elevator of the invention.

Figure 2 corresponds to the top of Figure 1 and shows another embodiment.

Fig. 3 schematically shows the hoisting rope arrangement of the traction sheave elevator of Fig. 1.

Figure 4 shows a cross-section of the rope groove of a traction sheave of a coward elevator of the invention.

Fig. 1 shows an elevator car 6 placed in the guides 10 of the elevator shaft 5, which is lifted by a hoisting rope 4. The elevator drive mechanism 1 is placed on the elevator shaft 5. The drive mechanism comprises a traction sheave 3 with a rope groove. The hoisting rope 4 from the elevator car 6 is led back downwards through the traction sheave 3 and further crosswise with the hoisting rope from the elevator car 8 to the counterweight 7

In Fig. 2, the same gripping angle 235 ° between the traction sheave and the hoisting rope is used as in Fig. 1, but the difference is that the hoisting rope 4 going to the elevator car is also guided through the deflection wheel 9.

In this way, the hoisting ropes coming from the traction sheave 3 are precisely guided, whereby the hoisting ropes can be very close to each other at the crossing point, but without touching each other. In this embodiment, the deviation of the hoisting rope from the plane of the traction sheave is 1.

It can also be seen from Figures 1 and 2 that the folding wheels can be located either in the engine room above the elevator shaft 5 as in Figure 2 or also in the roof of the elevator shaft 5 as in Figure 1.

Fig. 3 schematically shows the rope arrangement of the elevator of Fig. 1. The grip angle between the traction sheave 3 and the hoisting rope 4 is 235 ° · Then the value of the rope tension ratio m = —1 = e // CO <is 2.2 with the undercut angle of the rope S2 groove being 95 ° -

Fig. 4 shows a cross-section of an embodiment of a traction sheave 3 of an elevator according to the invention, in which the undercut angle of the rope groove 2 is shown.

-4 '56813

An essential advantage of the elevator according to the invention is that the friction between the traction sheave and the hoisting rope is high. This is mainly due to the fact that the grip angle is large. After all, friction is influenced by * van rope tension ratio expression in the form m = S1 = e '.

s2

The magnitude of the friction between the traction sheave and the hoisting rope in the elevator according to the invention offers some essential advantages compared to known traction sheave elevators. Thus, the counterweight and elevator car can be lightened by $ 40. This, in turn, results in significant material cost savings in elevator manufacturing. It also follows from the lightening of the counterweight and the elevator car that all other structures, such as guides, suspension members, grippers and the drive mechanism, can be lighter. Reducing the loads reduces the tensile stress of the hoisting ropes, while reducing the undercutting angle of the traction sheave reduces the surface pressure of the rope. Both of these factors extend the life of the hoisting rope so that the hoisting ropes can be dimensioned smaller.

It will be apparent to those skilled in the art that various embodiments of the invention may vary within the scope of the claims set forth below. Thus, it is not essential where the drive mechanism is located in relation to the elevator shaft, since the lifting ropes can be used to guide the hoisting rope in any way. Thus, the drive mechanism can also be at the bottom of the elevator shaft or on the side of the shaft in any floor. It is essential that, according to the invention, the friction between the traction sheave and the hoisting rope is made high in the traction sheave elevator. As a result, all elevator equipment is lightened, of course there can still be more than one hoisting rope and rope groove.

Claims (2)

56813 -5- 1. Traction elevator with drive unit (1) and connected to it? a traction sheave (3) with a rope groove (2) »through which your hoisting rope (4) is passed, and an elevator car (6) and its counterweight (7) suspended on a hoisting rope, placed in the elevator shaft (5), and with a hoisting rope going to the traction sheave and from the traction sheave the incoming hoisting rope is guided crosswise by means of at least one deflection wheel (8), characterized in that the grip angle between the traction sheave (3) and the hoisting rope (4) is between 210 ° -250 °, the free length of the hoisting ropes measured from their intersection to the traction sheave contact point is 1.9-0.7 times the traction wheel diameter. Traction sheave elevator according to Claim 1, characterized in that the grip angle between the traction sheave (3) and the hoisting rope (4) is 235 °, the free length of the hoisting ropes measured from their intersection to the traction sheave contact point being equal to the traction sheave diameter.