Elevator – industrial lift truck – or stationary lift for vehicle – Having specific load support drive-means or its control – Includes linking support cable in drive-means
Patent
1994-09-23
1996-04-30
Noland, Kenneth
Elevator, industrial lift truck, or stationary lift for vehicle
Having specific load support drive-means or its control
Includes linking support cable in drive-means
187277, B66B 1108
Patent
active
055116337
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a safety device for a passenger/freight elevator of the shaft elevator type, where the elevator turning wheel connected to the elevator drive system comprising an electric motor is provided with a peripheral bead or peripheral axial flange for engagement with a turn handle for rotation of the turning wheel to move the elevator car in the event of a power outage, or in case the car is wedged or jammed in the elevator shaft, or when the elevator is being serviced.
There is previously known a turn handle comprising an arm having a head formed for engagement with the peripheral edge of the turning wheel, which edge comprises a peripheral axially extending flange projecting out to both sides of the turning wheel and adapted for engagement with the turn handle head, having means for positioning it against, respectively, the inside and outside of the flange. On exertion of a force on the shaft of the turn handle, said force is transferred via the flange of the elevator wheel and rotates the wheel, whereby when electric current is disconnected from the elevator drive system, the elevator may be moved up or down, or dislodged from a wedged position. A turn handle of the type mentioned above is known from Norwegian Design Application No. 63723.
Regardless of the particular reason that may exist for moving an elevator car with the aid of said turn handle, the elevator drive system must be disconnected from the electric current supply in order to prevent the possibility of a person's inadvertently starting the elevator by pushing the elevator control buttons, and thereby causing accidents because the unauthorized person presses on the control buttons and causes the elevator car to move.
The purpose of the present invention is to provide a safety device for passenger/freight elevators of the type mentioned in the introduction, whereby said possible starting of the elevator during servicing or other operations in connection with the elevator is prevented. According to the present invention, this is achieved by means of the characterizing features disclosed in the characterizing clause of the following independent claim 1 and in the subsequent dependent claims. The invention will be explained further In the following with reference to the drawings, which illustrate an example of the construction of a turn handle and a holder therefor, where the holder and turn handle are provided with cooperative actuating means for actuation of the connecting position of the switch.
In the drawings,
FIGS. 1 and 2 show a perspective view of the holder from the front and the rear, respectively, with FIG. 1 also indicating the turn handle, drawn with a broken line, in secured position on the holder,
FIGS. 3a,b shows a rear view and side view, respectively, of the turn handle with its projecting actuating means, and
FIGS. 4a,b shows a front view and side view, respectively, of the turn handle without an actuating means.
FIG. 1 shows a holding plate 2 provided with legs 2b having through-going holes 2c for attachment to a wall in the elevator housing by means of screws or bolts. The holder 2 is provided with two spaced apart anchor bolts 8 at its center axis and with wing nuts 8a for the attachment of a turn handle 1, the shaft of which is provided with two holes 1c for engagement with said anchor bolts 8. In FIG. 1, turn handle 1 is indicated with broken lines, attached to the holder by means of said anchor bolts 8 and wing nuts 8a.
The indicated turn handle 1 is more clearly illustrated in FIG. 3 and comprises a shaft 1a and a head 1b at one end of the shaft. Head 1b for engagement with a flange or bead on the elevator turning wheel (not shown) is provided with a fixed jaw 6--preferably circular in shape--disposed transversely to the shaft 1a, and an elongated jaw 7 spaced therefrom and closer to the shaft, pivotable about a bolt 7a. When in use, head 1b of turn handle 1 will be positioned with jaws 6,7 on each side of the axial flange of the turning wheel, with the fixed jaw 6 on the inside of the flange.
REFERENCES:
patent: 3769473 (1973-10-01), Lay
patent: 4904829 (1990-02-01), Berthaud et al.
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