US2107956A - Safety device for elevators - Google Patents

Description

Feb. 8, 1938. OLSVARY I 2,107,956

SAFETY DEVICE FOR ELEVATORS Filed Nov. 6, 1935 I 2 Sheets-Sheet l 405x219 fl/swar ATTORNEY Feb. 8, 1938. OLSVARY I SAFETY DEVICE FOR ELEVATORS 2 Sheets-Sheet 2 Fil ed Nov. 6, 1935 ATTORNEY Patented Feb. 8, 1938 UNITED STATES PATENT OFFECE SAFETY DEVICE FOR ELEVATORS Application November 6, 1935, Serial No. 48,567

1 Claim.

This invention relates to safety devices for elevators and has for the primary object the provision of a device of this character which will be economical to manufacture and to install in an elevator and which will automatically secure the elevator against descent immediately upon the elevator becoming free from its suspension means or the breaking of the latter.

With these and other objects in view, this invention consists in certain novel features of construction, combination and arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawings, in which Figure 1 is a side elevation, partly broken away, showing an elevator equipped with a safety device constructed in accordance with my invention.

Figure 2 is a side elevation, partly in section, illustrating the same.

Figure 3 is a sectional View taken on the line 3-3 of Figure 2.

Figure 4 is a view similar to Figure 3 showing the safety device in the act of supporting the elevator.

Figure 5 is a horizontal sectional view illustrating the safety device applied to the elevator.

Referring in detail to the drawings, the numeral I indicates a conventional type of elevator equipped at opposite sides with rail guides 2 to slidably engage tracks 3. A connecting member 4 is secured to the elevator for a limited sliding movement relative to the latter and is adapted for connection by a connecting element such as a ring, 4a, to the usual hoisting cable 5. One end of the connecting member 4 has a head 6 engageable with a part of the elevator for limiting the sliding movement of the connecting member in one direction and which engages said elevator when the latter is suspended by the cable 5.

Oppositely directed parallel shafts 1 are journaled on the elevator and have eccentrically secured thereto dogs 8 and also arms 9. Said arms are connected to a pin H) by flexible elements H. The pin Ill is secured to the connecting member 4. Springs l2 act upon the shafts to rotate the latter in one direction and in a direction to bring said dogs 8 in biting engagement with the tracks of the elevator. During normal operation of the elevator, the dogs are held out of engagement with the tracks and against the action of the springs l2 by the flexible elements ll being connected to the pin Ill. However, should the raising and lowering cable 5 break or become disconnected from the hoisting mechanism (not shown) for the elevator or from the connecting member 4, this member will drop so that its connecting element la will engage the upper guide means at the top of the elevator as shown in Fig. 4 and the springs act to drive the dogs into engagement with the tracks to prevent falling of the elevator. The dogs 8 are in the form of serrated discs eccentrically journaled to the shafts so that when brought into engagement with the tracks incident to the weight of the elevator will create a wedging action between said dogs and the tracks and thereby prevent sliding movement of the elevator in a downward direction.

Having described the invention, I claim:

A safety appliance for an elevator that has rails movable through tracks, which includes a member mounted for slidable movement through pre-determined limits through the top of the elevator and to which the operating cable is attached, a laterally extending pin on said member flexible elements secured to the ends of the pin, spaced pairs of parallel oppositely extending shafts journaled on the elevator and having their confronting ends each formed with angle arms to which the respective flexible elements are individually secured, coiled springs having one end fixed on the respective shafts and their second end fixed to the elevator for separately turning the shafts in one direction and periph erally serrated wheels eccentrically fixed on the outer ends of the shafts and engageable with the track for the elevator.

LOUIS OLSVARY.

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