US3921763A

US3921763A - Motor driven hoist device for simultaneous lifting of a cage gate and a gate at a stopping level

Info

Publication number: US3921763A
Application number: US399874A
Authority: US
Inventors: Tage Westerlund
Original assignee: Linden Alimak AB
Current assignee: Linden Alimak AB
Priority date: 1972-09-25
Filing date: 1973-09-24
Publication date: 1975-11-25
Anticipated expiration: 1992-11-25
Also published as: SE366715B; GB1389777A; CA988110A; DE2347916A1; JPS4970357A

Abstract

The cage gate and a gate at a stopping level of a hoist are simultaneously opened by means of a motor. The motor is preferably mounted on the roof of the hoist cage and is able to lift or lower a vertical lifting rod that at its lower end via a lever means is connected to the cage gate. The lever means comprises two horizontal arms that project towards the stopping level gates. The stopping level gates have each a vertical rail projecting towards the cage gate in between the horizontal arms of the cage gate. Upon lifting the lifting rod the lever means actuates the arms towards each other and they will grip the rail of the stopping level gate and both gates will be lifted together by the lifting rod. Closing of the gates is carried out in reverse order.

Description

United States Patent Westerlund 1 Nov. 25, 1975 [54] MOTOR DRIVEN HOIST DEVICE FOR 2,633,932 4/1953 Clift 187/60 X SlMULTANEOUS LIFTNGOF A CAGE 3,051,269 8/1962 Guilbert 187/60 GATE AND A GATE AT A STOPPING LEVEL Foreign Application Priority Data Sept. 25, 1972 Sweden 12331/72 U.S. Cl. 187/52 LC; 49/65; 187/60 Int. Cl. B66B 13/12 Field of Search 187/51, 52, 55, 56, 58,

References Cited UNITED STATES PATENTS 2/1950 Guilbert et al 187/52 Primary Examiner-Evon C. Blunk Assistant Examiner.lames l... Rowland Attorney, Agent, or Firm-Fred Philpitt [57] ABSTRACT The cage gate and a gate at a stopping level of a hoist are simultaneously opened by means of a motor. The motor is preferably mounted on the roof of the hoist cage and is able to lift or lower a vertical lifting rod that at its lower end via a lever means is connected to the cage gate. The lever means comprises two horizontal arms that project towards the stopping level gates. The stopping level gates have each a vertical rail projecting towards the cage gate in between the horizontal arms of the cage gate. Upon lifting the lifting rod the lever means actuates the arms towards 'each other and they will grip the rail of the stopping level gate and both gates will be lifted together by the lifting rod. Closing of the gates is carried out in reverse order.

5 Claims, 2 Drawing Figures US. Patent Nov. 25, 1975 3,921,763

MOTORDRIVEN HOIST DEVICE FOR! SIMUL'IANEOUS LIFTING OF ACAGEGATEAND A- GATE AT-A. STOPPING LEVEL? The continuing mechanization in.the building industry.makesevenincreasing demands Qnbui-Iding hoists. For primarily ergonometrical reasons one h as'become more and more interested-in motor-operated hoist gates. The background of this is that many gatesare so heavyithat manual-operation is inconvenient. 1

It is the object of the invention to create a motordriven device for opening of a cage gate as well as a gate at a stopping level, which device is to be simple and, at the same time, reliable and satisfies great de-' mands for security.

One of the advantages of the device according to the invention is i.a. that only one motor is necessary for lifting both the gates by coupling them together at the start of the lifting operation. The gates at the stopping levels can without inconvenience be made so heavy that they can be opened manually only with difficulty and need not, in that case, be especially interlocked. Moreover all the required electric equipment for operation and adjustment of the gates can be placed in the hoist cage, which is especially important at shipyard hoists, where it is often desired to place the hoist at the bottom of a dock, where the lowermost stopping level will sometimes be below water level.

An illustrative example of the invention will now be described with reference to the accompanying drawing, in which FIG. 1 shows a front view of a lower portion ofa gate of a hoist cage with removed gate of the stopping level, when the cage gate is in a position completely pushed down, viz. closed position, and

FIG. 2 shows a top view of the device according to FIG. 1 together with a gate of a stopping level.

A gate of a hoist cage is designated by 1, and 2 is the lower edge of the gate. The gate of the hoist cage is mounted vertically movable in the hoist cage and vertically liftable and lowerable by means of a motor-3, arranged on the roof 31 of the hoist cage. The motor acts upon a rack 5 on a vertical rod 6 via a gear 4. At its lower end the rod 6 is connected via a lever means 7 to the gate 1 of the hoist cage at the latters lower edge 2.

The lever means 7 comprises an upper hinge 8, in which the end of the rod 6 and the ends of two

arms

9 and 10 arranged symmetrically around the axis of the rod 6 are rotatably mounted. The other ends of the

arms

9 and 10 are rotatably mounted viahinges 11 and 12 to the ends of

arms

13 and 14, also arranged symmetrically around the axis of the rod 6. The other ends of the

arms

13 and 14 are rotatably connected via

shafts

15 and 16 with a plate section 17 connected with the cage gate 1.

Arms

18 and 19 projecting from the cage gate 1 in adirection from the hoist cage are each rigidly connected to the interior ends of the

arms

13 and 14, ie the ends with the

shaft

15 and 16. These

arms

18 and 19 are intended to grip by means of shoulders 20 and 21 a rail 22 extending vertically and arranged on a gate at the stopping level 23 and perpendicularly to same (see FIG. 2) in front of the cage gate 1.

When the hoist cage has reached a stopping level and the gates are to be opened, the motor 3 is started in suitable manner, after which the rod 6 with the rack 5 kept against the gear 4 by a counter roller 24 is moved upwards from-the position shown in FIG. 1. The hinge 8-willgt hen be lifted and will turn the

arms

13 and 14 via the. arms 9 and. 10 so thatthe

grip arms

18 and 19 approach each other and engage the rail 22 with the shoulders 20 and 21 from both sides. The rotational motionof the grip arms v18 and 19 will then be stopped and consequently the motion of the whole lever means relative to the gate of the cage and that of the stopping level'which will be lifted together at the continued motion of the rod 6 in coupled state. When the gates have 'be'en'completely' opened a tappet 25 arranged on the rod'fi engages a roller '26 of a limit switch 27 stopping the motor 3. For illustrative purposes the tappet 25 has been placed upwards from its considerably lower, real position, which in FIG. 1 is at the cut off portion of the rod 6 for technical reasons in respect of the drawing.

When the gates are then to be closed the motor 3 is started in the other direction, the rod 6 with the gates moving downwards until the cage gate 1 is stopped by dogs not shown, after which the rod 6 continues a bit further at the same time as the

grip arms

18 and 19 are opened by means of the lever means 7, the gate 23 at the stopping level being disconnected from the cage gate 1 and the position shown in FIG. 1 and 2 being entered. The motor 3 is stopped by another limit switch 30, which is actuated by another tappet 28 via a roller 29.

The

grip arms

18 and 19 are arranged so that at closed cage gate, viz. the position shown in FIG. 1 and 2, they will be separated laterally from the rails 22 of the gates at the stopping levels such that the hoist .cage can pass the various stopping levels without any inconvenience. As the shoulders 20 and 21 engage the rail 22 in the same way at each position along the whole of the vertical extension of the rail no great demands on the positioning of the stopping of the hoist cage need be made for the coupling of the gates. The device functions even if the hoist cage stops a few cm too high or too low. To protect the lever means a shield 32 with a slit 33 as a lead-through for a pin in the hinge 8, connecting the rod 6 and the lever means 7 is further arranged between the lever means 7 and the interior of the hoist cage.

The invention is not restricted to the use of a rod 6 with a rack 5 for lifting thegates, but instead a wire can for instance be used if the lever means 7 is supplemented with a spring, which keeps the

grip arms

18 and 19 apart when the gate is closed.

What is claimed is:

1. In a hoist arrangement which includes a hoist cage, I

a gate for the hoist cage, and agate at a stopping level, the improvement which comprises a device for simultaneously raising the gate of the hoist cage and the gate at a stopping level which comprises in combination a. motorized lifting means on said hoist cage for applying an upward lifting force,

b. lever members on said hoist cage,

c. connecting means interconnecting said lever members and said motorized lifting means,

(I. a pair of opposed gripping members positioned on said hoist cage gate and being mounted so as to be movable from a non-gripping position wherein the gripping members are spaced apart as far as possible to a gripping position wherein said gripping members approach each other as closely as possible,

e. means interconnecting said lever members and said gripping members, and

3 f. a member on said stopping level gate that is positioned so that it is engageable between said gripping members when the gripping members are in their gripping position, whereby when said lifting means exerts an upward force the lever members in turn cause said gripping members to change from a non-gripping position to a gripping position so that the gripping members will grip said stopping level member on said stopping level gate so that both said gate for the hoist cage and said gate for the stopping level adjacent the hoist cage will be raised simultaneously.

around the axis of said vertical rod.

Claims

1. In a hoist arrangement which includes a hoist cage, a gate for the hoist cage, and a gate at a stopping level, the improvement which comprises a device for simultaneously raising the gate of the hoist cage and the gate at a stopping level which comprises in combination a. motorized lifting means on said hoist cage for applying an upward lifting force, b. lever members on said hoist cage, c. connecting means interconnecting said lever members and said motorized lifting means, d. a pair of opposed gripping members positioned on said hoist cage gate and being mounted so as to be movable from a nongripping position wherein the gripping members are spaced apart as far as possible to a gripping position wherein said gripping members approach each other as closely as possible, e. means interconnecting said lever members And said gripping members, and f. a member on said stopping level gate that is positioned so that it is engageable between said gripping members when the gripping members are in their gripping position, whereby when said lifting means exerts an upward force the lever members in turn cause said gripping members to change from a nongripping position to a gripping position so that the gripping members will grip said stopping level member on said stopping level gate so that both said gate for the hoist cage and said gate for the stopping level adjacent the hoist cage will be raised simultaneously.

2. A device according to claim 1 wherein the motorized lifting means comprises a motor on the upper portion of the hoist cage.

3. A device according to claim 1 wherein said lever means is arranged adjacent the lower edge of hoist cage gate.

4. A device according to claim 1 wherein said lifting means includes a motor connected to a rack on a vertical rod by means of a gear.

5. A device according to claim 4 wherein said lever comprises two pairs of arms arranged symmetrically around the axis of said vertical rod.