US2266634A - Elevator safety device - Google Patents

Description

P. GROSS ELEVATOR SAFETY DEVICE Dec. 16,1941.

Fileid Jan. 3l, 1941 INVENTOR ATTOR N EYS WITN E55 Patented Dec. 16, 1941 ELEVATOR SAFETY DEVICE Paul Gross, Wallace, Idaho, assigner of one-fourth to Mendel J oy, Mullan, Idaho Application January 31, 1941, Serial No. 376,917

(Cl. IS7-87) 4 Claims.

This invention relates to safety devices for elevators, and its general object is to provide a dev1ce that is primarily designed for the usual mine hoist, but it can be used on any passenger and freight elevator of the cable hoisting cage and parallel side guide type, as my device includes toothed means that are normally spaced from the guides, but in the event the cable or any of the hoisting apparatus should break to allow free falling of the cage, the device is automatically rendered active for moving the toothed means in gripping and penetrating engagement with the guides to `arrest the descension of the cage substantially simultaneously with the breakage, thus eliminating injury or damage, as will be apparent.

A further object is rto provide a safety device that can be easily installed on elevators now in general use, and will in no way interfere with the normal operation thereof.

Another object is to provide a safety device that requires minimum attention, as the parts thereof are normally inactive and are rendered active only in the event of breakage, as above set forth.

A still further object is to provide a safety device that is simple in construction, inexpensive to manufacture and extremely efficient in operation, use and service.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawing and specifically pointed out in the appended claims.

In describing the invention in detail, reference will be had to the accompanying drawing wherein like characters denote like or corresponding parts throughout the several views, and in which:

Figure 1 is a sectional view taken approximately on line I-I of Figure 2, looking in the direction of the arrows and illustrates the parts in normal position.

Figure 2 is a sectional view taken approximately on line 2-2 of Figure 1, looking in the direction of the arrows.

Figure 3 is a fragmentary sectional view similar to Figure 2, but illustrates the parts in operatve position.

Referring to the drawing in detail, the letter A broadly indicates the frame for the cage shaft and while I have illustrated only the center guide members B for the cage, it will be obvious that the frame is of the usual construction. C indicates the lifting cable and D the upper wall or portion of the cage.

The device which forms the subject matter of the present invention includes a rectangular sectional casing made up of an outer section that is provided with an upper horizontal wall I welded or otherwise fixed to the Wall or portion D of the cage, and side walls 2 having inwardly eX- tending end and bottom flanges 3 and 4 respectively. The upper wall I is likewise provided with depending flanges 5 throughout the length thereof, as best shown in Figure 2. The inner section is substantially U-shaped to provide a bottom wall 6 and side walls 1 and is of less height than that of the outer section, but otherwise fits therein for free vertical movement between the upper wall I and the bottom flanges 4.

Bolted or otherwise secured to the bottom wall 6 of the inner section and extending through a slot in the upper wall I is a coupling bar 8 having the cable C connected to the upper end thereof, so that the cage'will be connected to the cable through the medium of my device. Formed on opposed sides of the coupling bar' are pairs of stop lugs 9 and I0, the lugs 9 being disposed above the casing for engagement with the upper surface of the upper wall I, while the lugs I0 are arranged on the bar 8 for disposal within the casing for engagement with the under surface of the upper wall I, as will be apparent upon inspection of Figure 2, which clearly illustrates that the lower lugs I0 are normally engaged with the wall I.

Disposed within the casing and having threaded shanks II threaded through the upper wall I are disk abutment members I2 for the upper ends of compression springs I3 that have their lower ends bearing against the bottom wall 6 for urging the inner section downwardly to the position of Figure 3, and the spring elements are arranged along the longitudinal center of the casing, as shown in Figure 2. In view of the fact that the abutment members I2 are threadedly associated with the wall I, it will be obvious that the tension of the springs I3 can be adjusted, by rotating the disk members.

Secured tothe end walls 2 and extending inwardly and downwardly therefrom in converging relation with respect to each other, are pairs of bracket arms I4 terminating at their lower ends in bearings I5 having mounted for rotation therein a pair of parallel rock shafts I6. Each of the shafts I6 have toothed dogs I'I keyed or otherwise fixed to the nouter ends thereof for normal disposal in parallelism with and upon opposite sides of the guide members B, as best shown in Figure 2. The dogs increase in width from their connection with the shafts to provide relatively long arcuate outer faces having teeth i8 formed thereon for the major portion of their length, with the teeth extending from one end of the faces, while the opposite end portions of the faces are free from teeth, as clearly shown in Figure 3. That feature not only tends to increase the gripping and penetrating action of the dogs, but prevents splitting or breakage of the guide members B.

Welded or otherwise secured to and depending from the bottom wall 6 of the inner section are semidisk shaped ears I9 arranged in pairs and each ear has connected thereto through the medium of links 20, a cam member 2l, that is held in constant engagement with its ear', but for movement thereon, from the position of Figure 2, to that of Figure 3, as the pins 22 that connect the links 20 to the cam members are mounted in arcuate slots 23 of the cam members to bring about said movement. The major portions of the ycam members are oval shaped but they are formed to provide substantially disk like portions 24 on one of the ends thereof, and the cam members are keyed or otherwise secured to the shaft I6 with the latter extending through the disk like portions.

From the above description and disclosure in the drawing, it is believed that the operation of my device will be obvious, but it might be mentioned that in the event the cable C or any part of the hoisting apparatus. should break, to allow free falling of the cage, the weight of the cage will be released from the bar 8 and consequently the inner section will be lowered in the outer section by the action of the springs I3. That movement of the inner section will cause the ears I9 to exert a bearing action against the cam members and thereby move the latter from the position of Figure 2 to that of Figure 3, so as to rock the shafts I', for the latter to move the dogs in biting engagement with the'` opposite sides of the guide members B, as shown in Figure 3. B-y that action, it will be seen that the' descension of the cage is arrested and such is brought about substantially simultaneously withy the breakage, thus my device not only arrests the cage but does so in a. man-ner to prevent any possibility of injury or damage, assufcient time does not elapse between the breakage and the stop for the cage to gather any material' momentum.

It is thought fromV the foregoing description that the advantages and novel* features of the invention will be readily apparent.

It is to be understood that. changes may be made in the construction. and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appendedA claims.

What I claim is:

1. A safety device for an elevator, the latter including a cage, a hoisting cable and guides for the cage, and said device comprising a casing including an outer section having an upper wall fixed to the cage, sid'ewalls depending from the upper wall, inwardly extending marginalflanges on said walls, an inner section including a bottom wall and side walls rising from the bottom wall, said inner section being mounted for vertical. movement in the outer' section and held therein by the walls' and flanges thereof, a coupling' bar fixed to the bottom wallf and extending through the upper wall, stop means on the coupling bar to limit the movement of the inner section, coiled springs between the upper and bottom walls for urging the inner section downwardly, abutting means for the springs and adjustably mounted in the upper wall for adjusting the springs, said bar having the cable connected thereto for normally holding the springs contracted, toothed dogs mounted for normal disposal in spaced relation to the guides, and means carried by the inner section for moving the dogs into biting engagement with the guides.

2. A safety device for an elevator, the latter 'including a cage, a hoisting cable and guides for the cage, and said device comprising means including inner and outer sections, the outer section being fixed to the cage and the inner section mounted for vertical movement in the outer section, a coupling b-ar fixed to the inner section and extending vertically through the outer section, springs between the sections for urging the inner section downwardly, said bar having the cable connected thereto for normally holding the springs contracted, brackets arms secured to the outer section and depending therefrom in converging relation with respect to each other, shafts mounted for rocking movement in the lower ends of the bracket arms, toothed means fixed; to the shafts and normally held spaced from the guides, rounded ears xed to the inner section, cam means connected to and engaged with the rounded ears, and said cam means being xed to the shafts for rocking the latter to move the toothed means into biting engagement with the guides.

3. A safety device for a cage, a hoisting cable and guides for` the cage, and. said device comprising means including inner and outer sections, the outer section being xed to the cage and the inner section mounted for vertical movement in the outer section,ra-coupling bar fixed to the inner section and extending vertically through the outer section, springs between the sections for urging the inner section downwardly, said bar having the cab-le connected thereto for normally holding the springs contracted, bracket means fixed to and depending from the outer section in converging relation, shafts mounted in the lower ends of the bracket means for rocking movement, toothed dogs fixed at one of their ends to the shafts andthe opposite ends being relatively wide and shaped to provide arcuate faces with the teeth formed on a portion of said faces, said dogs being arranged for normal disposal in spaced relation to the guides, and means carried by the inner section and connected to the shafts for rocking the latter to move the dogs into biting engagement with the guides.

4L, A safety device for an elevator, the latter including a cage, a hoisting cable and guides for the cage, and said device comprising means inciuding inner and outer sections, the outer section being Xed to the cage and the inner section mounted for vertical movement in the outer section, a coupling bar fixed to the inner section.

and extending vertically through the outer section, springs between the sections for urging the inner section downwardly, said `bar having the cable connected thereto for normally holding the springs contracted, bracket arms secured to and depending from the outer section in converging relation with respect to each other, shafts mounted for rocking movement in the lower ends of! theA bracket arms, toothed dogs' fixed-to the ends ofthe shaft and normally held:

for the cam members being mounted in the slots thereof, and disk like portions formed on the oval shaped portions and keyed to the shafts for rocking the latter to move the dogs into biting 5 engagement with the guides.

PAUL GROSS.

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