US909322A - Safety device for elevators. - Google Patents

Description

Jay. 1.

c. PARADIS.

SAFETY DEVICE FOR ELEVATORSr APPLIOATION rILnn we. 5, 190-1.

Patented Jan. 12, 1909.

ing the up er ends of said uprights.

UNITED STATES PATENT OFFICE.

SAFETY DEVICE FOR ELEVATORS.

Specification of Letters Patent.

Patented Jan. 12, 1909.

Application filed August 5, 1907. Serial No. 387,211.

To all whom it may concern:

Be it known that I, GnAnLns PARADIS, a citizen of the United States, residing at Lowell, in the county of Middlesex and Commonwealth of Massachusetts, have invented a certain new and useful Improvement in Safety Devices for Elevators, of which the following is a specification.

This invention relates to safety devices for elevators and comprises means hereinafter described, whereby the person in charge of the elevator-car may stop the same instantly upon the too rapid descent of said car, due to any failure of the hoisting and lowering machinery.

Sometimes elevator-cars provided with automatic safety devices, are raised by chains, the weight and drag of which when broken will prevent the springs from operating to effect the enga ement of the dogs or catches with the safety-racks and sometimes the unbroken hoisting rope or chain unwinds so fast from the drum that the car attains a (.l'angerous speed without said rope or chain becoming slack enough to permit the expansion of said. springs.

The safety device hereinafter described is directly in the control of the person in charge of the elevator, by means of a lever arranged in proximity to the starting rope on which lever said person or elevator-man is ex ected to have his hand at all times while t 1e elevator is being used, so that he may immediately operate the safety-device when the car drops or attains a dangerous speed in. the downward direction.

In the accompanying drawing, Figure 1, is a front elevation of the safety-device, omitting the controlling lever, applied to the frame of a car, arts of said frame being shown in section; ig. 2, a front elevation of said car and its guides, both of said guides being broken away to show the safety-racks; Fig. 3, a plan of the dog and hand-lever and a horizontal section of the rack.

The elevator-car shown is of the common form used in factories and warehouses for elevatin freight and comprises a platform A, uprig its a a and a cross-head a connsecti an ear is raise and lowered by means of a rope, chain or similar flexible connection secured in any usual manner to a bolt b arranged in the cross-head a, and is limited to a vertical path by the guides C C, also in the usual manner. Said guides support safety-racks D D provided with teeth (1 which point up wardly and are referably inclined downward slightly on t ieir tops at d.

In a suitable stand I), which is re resented as the head of the bolt 6 arranged elow the cross-head, is pivoted a dog-lever E, at e, midway between its ends. Dogs or catches F F are arranged to slide horizontally in sleeve-bearings f f secured in the uprights a a and are connected by links f 2 f 3 to op posite ends of the lever E. The undersides of the outer ends of the dogs F F are inclined downward and outward at f f to fit the tops of the teeth of the racks D D and the end-surfaces of said dogs should also be parallel with the rising parts of the teeth. A hand-lever G is pivoted at g on the up right a and is rovided at its lower end with a suitable han e (1 adapted to be rasped by one hand by the elevator-man, and said lever is provided at its upper end with a fork g which receives a stud h which projects horizontallv from a slide H arranged to move parallel with the dog F in a way h supported on the upright ed. A connecting rod 1 is pivoted at one end at i to the link) and at the other end at i to said slide H.

When the handle g is drawn towards the center of the elevator car, the dog F is thrown into engagement with the corresponding rack D and through the links f 2 f 3 and the lever E simultaneously forces the dog F into engagement with the other rack D and prevents the further descent of the elevator-car. The movement of the lever E in either direc tion is limited by the inclined surface 6 of the stand I) to prevent said leverE from turning beyond the center and withdrawing the dogs from the racks. When the dogs are engaged with the teeth of the rack, the weight of the elevator car presses said dogs down into said teeth with such force that it is impossible to reverse the hand-lever until said car is lifted by some means and this would be the case ordinaril even if the dogs and teeth were not incline or hookin as described, but the construction describe is adopted for still greater safety.

A s rin represented as a helical spring J stretched etween the cross-head a and the link f normally holds the dog-lever E in the osition shown in Fig. 1 and prevents the ogs F F from bein jarred into engagement with the racks. T e racks are sufficiently wider than the dogs to obviate any danger of the dogs being prevented from engaging the racks by striking the guides at the sides of the racks, as shown in Fig. 3.

I claim as my invention:-

1. The combination of an elevator-car provided with a frame having uprights, stationary racks, dogs arranged to slide in said frame to engage said racks, a dog-lever, links, each connecting an end of said dog-lever to one of said dogs, a hand-lever supported on one of said upri hts and connecting means between said han lever and one of said links, to move said dogs by the movement of said lever.

2. The combination of an elevator-car rovided with a frame, stationary racks, ogs arranged to slide in said frame to engage sald racks, a dog-lever, links each connecting an end of said dog-lever to one of said dogs, a hand-lever supported on said frame, a slide movable on said frame and engaged b said hand-lever, and a rod connecting sai slide and one of said links.

3. The combination of an elevator-car rovided with a frame, stationary racks, ogs arranged to slide in said frame to engage said racks, a dog-lever, links, each connecting an end of said dog-lever to one of said dogs, a hand-lever supported on said frame and provided with a fork, a slide movable on said frame, and provided with a stud engaged by said fork, and a rod to connect said slide and one of said links.

4. The combination of an elevator-car provided with a frame having uprights, stationary racks, dogs arranged to slide in said frame to engage said racks, a dog-lever, links, each connecting an end of said dog-lever to one of said dogs, a hand-lever supported on one of said uprights, connecting means between said hand-lever and one of said links to move said dogs by the movement of said lever, and means for limiting the movement of said doglever.

In witness whereof, I have afiixed my signature in presence of two witnesses.

CHARLES PARADIS.

Witnesses:

ALBERT M. Moons, LUDGER A. NIooL.

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