FI90755C - Gears for gear rack lift - Google Patents

Description

i 90755

The present invention relates to a rack-and-pinion-holding device according to the preamble of claim 1.

A number of different rack elevator holding devices are known to ensure elevator operation. Reference may be made to U.S. Patent No. 10,520,998 and FR Patent No. 2,422,586 to describe the prior art. Said rack holding device is known from said publications, which has a gear-engaging gear which is non-rotatably mounted on the shaft. Said shaft further supports two friction elements 15 which are spring-loaded against each other to provide mutual frictional gripping, one of which is rotatably supported on the shaft and the other is slid-mounted on the shaft but is normally involved in the rotating shaft due to frictional engagement. The latch-20 mechanism in the device is adapted to stop the second friction element for braking the shaft through frictional engagement when the limit speed is exceeded. The latch mechanism comprises a latch member oscillatingly suspended in a plane perpendicular to the shaft so that when it exceeds its limit speed due to its slowness, it is compressed between a fixed response and a second friction element support.

The object of the invention is to provide a safer and more reliable elevator braking in such a device than has previously been possible.

This is achieved in such a way that the holding device has acquired the features mentioned in claim 1.

The invention primarily comprises an oscillating suspension of the latch element by means of a pendulum, which, when held, enables inward control into the opening and thus always a locked position for the latch element. The result is also always 2 safe use of the circuit breaker. Said advantages have not been achieved with similar prior devices in which the latch element is fixed.

Fig. 1 shows a partial section of the holding device according to the invention in the direction of arrows I-I in Fig. 2, and Fig. 2 shows a plan view of the holding device in the direction of arrows II-II in Fig. 1.

The holding device has a gear 2 in contact with a rack, not shown, which is rotatably connected to the shaft 4. The shaft 4 is mounted at 6 on a base plate 8 fixedly connected to the elevator car, which is arranged to be mounted vertically. The base plate 8 has a bracket 10 mounted in the same horizontal plane as the shaft 4. The bracket 10 has a central opening along the shaft 4 and the elements connected thereto, described below. Furthermore, the handle 12 supports the housing 12, which is attached to the bracket 10 by means of a screw connection 14.

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The shaft 4 non-rotatably supports a roller 16 with a conical surface on the inside of the plate 8. The wheel 16 is embedded perpendicular to the shaft 4 in a rotating cup part 18. The cup part 18 has a conical inner wall arranged in the conical circumference 25 of the wheel 16. A friction end is arranged between the conical surfaces of the wheel 16 and the bowl part 18. The cup portion 18 is mounted by a plain bearing 20 on the shaft 4. On the cup portion 18, the shaft 4 supports a sleeve 22 which is mounted in an opening in the body 10 by a bearing 24. Below the body 10, the sleeve expands into a cup shape 26 through a disc spring package 28. The sleeve 22 is held in place at the end of the shaft 4 by means of an end plate 30 fixed to the shaft 4 by means of four screws 32. More specifically, the protrusion 34 in the plate portion 30 presses through the seal 36 against the end of the sleeve 22. 35

By means of the disc spring package 28, a pressure is provided against the cup part 18, so that it is later pressed against the plate 16 and thus also the conical surfaces against each other via a friction coating.

The cup portion 18 has two outwardly profiled abutments 38 and 5 40. The shape of the abutment 38 is hexagonal, as shown in the top view in Figure 2. The abutment 40 has a sawtooth-shaped profile with six teeth, as also shown in the top view in Figure 2. the teeth are arranged in a brochure manner opposite 38 flat sides of each hexagonal response. In addition, each tooth has a toothed side 42 facing in the direction of rotation.

The oval pendulum element 44 is articulated at one end to a bolt 46 fixedly connected to the plate 8.

The bolt 46 is not shown in Figure 1. The oval pendulum element 44 has a stop 48 and 50 projecting at each leg of the handle 10. The length of the stop 48 is such that the longitudinal axis of the pendulum element 44 extends substantially perpendicular to the plane of the handle 10 when the stop 48 is against the foot 10 20 near the leg. The stop 50 is shorter than the stop 48 and supports a compression spring 52 tensioned between the side of the pendulum element 44 and the foot near the handle 10. The resilient tightening thus provided by the pendulum 44 limits the undesired-25 and vibratory movements of the pendulum 10 between the legs when the elevator is in motion.

At its lower end, the pendulum 44 articulates at 53 a crescent-shaped latch element 54. The latch element 54 is not visible in Figure 1, but is supported within the pendulum 30 44 so that it is flush with the tooth profile 40. The latch member 54 has a hook end 56 and an opposite end 58 formed with the toothed sides 42 of the engagement arms. On the inner side away from the pendulum 44 in the vicinity of the head 58, the latch member 54 supports a roller 60 in the same plane as the hexagonal profile 38. The roller 60 is resiliently pressed against light contact around the circumference of the hexagonal profile 38 by means of a tension spring 62 acting between the pendulum 44 and the latch element 54. The tension of the tension spring 62 is adjustable by means of the screw nut arrangement 64.

The plate 8 supports a circuit breaker 66 in the elevator drive circuit 66 with a drive element 68 which, when acted upon as described below, cuts off the drive circuit by means of a base 70 in the latch element 54.

In the same plane as the latch element 54, there is, connected to the circuit breaker 66, a plate 72 with a V-shaped notch 74 located opposite the end 58 near the latch element, which has a sharp shape complementing the notch 74.

The retaining device described works as follows:

In normal use, all of the above-described elements supported by the shaft 4 rotate with the gear 2 and shaft 4 as shown in Figure 2. The roller 60 with the latch member 54 follows the hexagon ring 38. but while the roller leaves an angle and runs to the flat side of the hexagonal profile 38, the hook end 56 of the latch element 54 is sufficiently raised by the spring 62 from the trajectory of the toothed steel profile 25 40 before the latch member 56 of the latch element 54 has a side

As the rotational speed of the shaft 4 increases, the slowness of the latch member 30 causes the roller 60 to have no tendency to follow the flat side of the hexagonal profile 38. At the specified limit speed, this ensures that, finally, the hook end 56 of the latch element 54 does not have time to lift the sawtooth profile 40 from the trajectory, but strikes the side 42 at the adjacent tooth-35. This causes the pendulum 44 to swing to the left in Figure 2 as it engages the saw blade profile 40 in the blink of an eye, so that the end 58 of the latch element 54 enters the opening 74. Thus, a secure locking of the latch element 54 is achieved.

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90755 5 between the opening 74 and the tooth side 42, and the cup part 18 stops immediately on the shaft 4. This causes the shaft 4 to be braked by frictional engagement between the conical surfaces of the cup part 18 and the cylinder 16, so that a soft braking on the shaft 4 is achieved.

As the latch element 54 moves toward the opening 74, the drive element 68 of the circuit breaker 66 is also operated by means of the base 70 on the latch element 54, so that the elevator drive circuit 10 is cut off.

The aforementioned limit speed at which the holding device is to operate is controlled by adjusting the tension of the spring 62.

The braking time is determined primarily by the spring force of the spring package 28 with which the cup part 18 is pressed against the rod 16.

Claims (6)

6 A rack-and-pinion support device with a pancreas The stang is an engaging gear (2) f mounted non-rotatably on a shaft (4) which also supports two friction elements (16, 18) which are spring-loaded (28) to each other. to provide mutual frictional engagement, one (16) of which is non-rotatably supported by the shaft (4), and the other (18) is plain bearing (20) on the shaft, but normally has a rotating shaft (4) due to frictional engagement, the shaft (4) when the speed limit is exceeded, the latch mechanism (38, 74) is adapted to stop the second friction element (18) for braking the shaft, thus through frictional engagement when the latch mechanism comprises a latch element (54) oscillatingly suspended (44, 46) on the shaft (44, 46) , so that when the limit speed is exceeded due to its slowness, it is compressed between the fixed response (74) and the response (42) supported by the second friction element (18), feeling characterized in that the fixed abutment has an opening (74) into which the cam (58) of the oscillatingly suspended latch element (54) is arranged to be guided into the engagement between the two abutments (42, 74), and that the opening (74) is arranged in an elevator drive circuit a circuit breaker (66) operated by the oscillatingly suspended latch element (54) when guided into the opening (74). 25 Retaining device according to claim 1, characterized in that the hook end (56) of the oscillatingly suspended latch element (54) for gripping the stop (42) of the second friction element (18) is made to act between the latch element 30 (54) and the second friction element (18). under the action of the cam mechanism (38, 60) resiliently outside the trajectory of the stop (42) at speeds below the limit speed of the shaft (4), which reaches the limit speed when the cam mechanism (38, 60) is reached due to the inertia of the latch element. Retaining device according to Claim 1 or 2, characterized in that the oscillatingly suspended latch element (90) is also suspended by a rotational movement mounted over the oscillating movement about an axis (53) of the arms located between the parts of the latch element which are adapted to engage the stops (42, 74). Retaining device according to one of the preceding claims, characterized in that the second friction element (18) has a saw-shaped profile, in which each tooth (42) 10 forms a stop for engaging with an oscillatingly suspended latch mechanism (54). 5. In any one of the preceding claims pidåtin unit according further characterized in and working the cam mechanism (38, 60) kåsittåå 15 oscillating suspended blocking element carried by a cam-follower roller (60), which sillå side of the blocking element (54) of the rotational axis (53) which is poispåin blocking element ( 54) on the side intended to engage with the stop (42) of the second friction element (18), the spring (62) acts against the externally profiled stop (38) in the second friction element (18), whereby each tooth of the sawtooth profile ( 42) is located between two corners of the profiled stop (38) and wherein the spring (62) is dimensioned so that at speeds exceeding the speed limit it is unable to keep the cam follower roller (60) in contact with the parts extending between the corners of the profiled stop (38); wherein the latch element (54) is brought into contact with the teeth by the teeth (42) of the second friction element (18). 30 Retaining device according to one of the preceding claims, characterized in that the oscillating movement is damped (52). 8