US1977484A - Elevator mechanism - Google Patents

Description

Oct. 16, 1934- 'F. w. LAGERQUIST ET AL ELEVATOR MECHAN I SM Caw/ '5. layer aisf UNITED STATES Patented Oct. 16, 1934 PATENT OFFICE 1,977,484 ELEVATOR M oHANIsM Frank W. Lagerquist and Carl S. Lagerquist, Minneapolis,.Minn.

Application October 18, 1933, Serial No. 694,086

4 Claims.

$ 19 dependable in operation and require a minimum of power for its operation.

The above and other important objects and advantages of the invention will be made clear from the following specification and claims.

Generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined.

In the accompanying drawings, which illustrate theinvention, like characters indicate like parts 319 throughout the several views.

Referring to the drawings;

Fig. 1 is a fragmentary sectional view taken ,approximately on the horizontal line 11 of Fig. 2; I

Fig. 2 is a fragmentary view in vertical section of-the upper end portion of an elevator shaft. or hatchway and associated elevator mechanism and is taken on the line 22 of Fig. 1 but shows some 'parts above Fig. 1 andsome parts on the section ....30 line in full;

.Fig. 3 is a fragmentary rear view .with some parts broken away of an intermediate upperportion and extreme lower end portion of the elevator shaft or hatchway and associated elevator as mechanism and is taken on the line 3-3 of Fig. 1;

1 Fig. t is a fragmentary view with some parts broken away and sectioned on the same line as ."Fig. 3 and illustrating a portion of the shaft, in-

termediate the upper and lower fragments of ,40 (Fig. 3;

Fig. 5 is a detail view in end elevation of one ofthe segmental nuts of the apparatus; and Z Fig. 6 is a detail View in face elevation of the segmental nuts shown in Fig. l.

The elevator shaft or hatchway, which is of the ponventional character, is indicated as an entirety by 10. This elevator shaft or hatchway,as it will hereinafter be referred to, extends vertically from a lower floor 11 of a building through an up- .60 per'floor or floors 12 of the building and is promovements, in respect to the sides ,ofthe hatchway, by means of laterally spaced parallel guide flanges 15 and upper and lower pairs of laterally spaced channeled guide lugs 16 that are mounted fast on the back of the elevator car 14. Opposite channeled guide lugs 16, of each laterally spaced pair, work slidably over an opposite guide flange 15. In the preferred arrangement illustrated the several guide lugs 16 are integrally formed with a skeletonized cast back plate 17 that is rigidly secured to the back of the. car by nut-equipped bolts 18. In the example illustrated theguide flanges 15 are the inner flanges of opposed channel members 19 which channel members are tied together at intervals and-maintained in proper spaced relation by a series of vertically spaced cross-members 20. I

- The channel members 19 are anchored fast to the rear wall of the hatchway by anchoring brackets 21 and suitable nut-equipped bolts 22. The channels 19 are secured fast to the anchoring brackets 21 and to the cross-members 20 by nut-equipped bolts23. ,The channels 19 are supported from the lower floor ll through the medium of a power mechanism housing 24 to the top of which the lower ends of the channel members 30 are anchored by means of angle brackets 25 and bolts26. I

Also mounted on the power mechanism housing 24 and extending vertically therefrom, between and inparallel spaced relation to the chans5 nel members 19, is a feed-screw 27 that terminates near the top of the hatchway 10. This feed-screw 27 is journaled, at its lower end portion, in a bearing boss 24 formed in the top of the housing 24-. and is reduced within the bear- ;9.()

ing boss 24?- to afford a shoulder 2'7 that seats upona suitable thrust-bearing 28 preferably of the ball-bearing type. The reduced portion of the shaft below the shoulder 2'7 extends into the power mechanism housing and is connected therein to be driven from a suitable driving mechanism, not shown, but which does, inpractice and may here be assumed to include, a conventional reversible electric motor and cooperating speed-reducing power transmitting conr nections; 1 g

o The feed-screw 27 is journaled at its upper end and at several equally spaced points intermediate its ends in segmental supporting bearings 29 each of which, in the preferred arrange 2 ment fllustrated, is formed as a part of a crossmember 2i) and surrounds or encircles more than one-half of the feed-screw so as to positively confine the feed-screw therein but are open adjacentthe backs of the elevator car 14. Byreference to the drawings it will be seen that the threads of the screw are so coarse that the portions of the shaft between adjacent convolutions of the threads are sufliciently wide to afford efficient bearing-engaging surfaces.

Carried by the elevator car 14 and mounted on the back plate 17 thereof is a vertically spaced pair of segmental nuts that have screwthreaded engagement with the feed-screw but surround or encircle less than one-half thereof and are sufficiently narrow to pass freely through the open portions of the segmental feed-screwsupporting bearings 29. The segmental feedscrew-engaging threads of the segmental nuts are indicated by 31. At their bases the segmental nuts 30 are flanged at 32 and said nuts are anchored to the back plate 1'7 of. the car by nutequipped bolts 33 that are passed through vertically extended adjusting slots in the flangedbases thereof and suitable bolt holes in the back plate 1'7 and the car. It should be here understood that only one segmental nut may be employed if desired but when, as often is the case, two or more thereof are employed, it is necessary to affect proper spacing of the nuts so as to bring the thread segments of all thereof into alignment and non-binding engagement with the screw-threads of the feed-screw and it is for the purpose of affecting such adjustments that we provide the slots 34 in the nut flanges. For the purpose of rendering such relative adjustments of the nut segments 30 easily and accurately made, we provide lock-nut-equipped adjusting screws 35 that work vertically through internally threaded lugs 36 formed on the back plate 17 and engage the lower ends of the segmental nuts. It will nowbe evident that when the feed-screw is rotated in one direction the nut segments 30 and attached elevator car 14 will be moved upwardly and when the feed-screw is rotated in the opposite direction the nut segments and car will move downwardly in the shaft or hatchway 10. The feed-screw 2'7 is, of course, positively held against wobbling movements by the segmental bearings 29 and, therefore, since the segmental nuts 30 and car 14 are guided for true parallel movements in respect to the feed-screw, binding between thesegmental nuts and feedscrew or disengagement of the segmental threads of the nuts 30 from the threads of the feed-screw can not occur at any time during the movements of the car regardless of the load placed in the car and further the segmental nuts will, under all conditions, be maintained centered with the openings in the segmental bearings 29 so that they will pass freely through the same.

In practice, the opposed channel members 19, associated cross-members 20 with their incorporated segmental bearings 29 and the feedscrew, may be assembled and shipped to the place of installation complete and then lifted into position in the hatchway as a unit through a suitable opening at the bottom portion thereof. The guide lugs 16 are readily applied to the rails or flanges 15 from the upper ends thereof and the segmental nuts may be applied either before or after placement of the guide lugs on the flanges 15.

From the foregoing it will be appreciated that the apparatus described is relatively inexpensive to construct, is very easily and inexpensively erected, and is so rigid of construction that it will render trouble-free service for great periods.

In many instances it is not necessary to counterbalance the car but in cases where the. loads to be applied are relatively great, it is often necessary or desirable to relieve the driving mechanism from the weight of the car and anchored parts and for this purpose we provide a counter weight 37 and connecting cable 38, which cable runs over suitable sheaves 39. The sheaves 39 are journaled on shafts 40 between supporting arms 41 that are secured to and project from opposite outside upper end portions of the opposed channel members 19. The cable 38 is anchored to the top of the car 14 by an eye-bolt 42 and at its other .end to the counter weight by an eye-bolt 43. At its opposite edges the upper and lower sections 44 of the counter weight are channeled vertically to receive opposed guide rails 45. The guide rails 45 are inserted between the channels 19 and their cooperating anchoring brackets 21 and are secured in place by the bolts 23. The intermediate sections 46 of the counter Weight are of less width than the distance between the guides 45 and may be employed in varying numbers to obtain the desired balance.

Obviously, the guides 45 for the counter weight may be assembled with the channels at the factory and shipped ready to erect as part of the fabricated unit and the weight may be applied from the upper end after erection of the apparatus.

.What we claim is:

1. In an elevator vertical power-driven feed-screw journaled at its opposite end portions between opposed channel rails extending in parallel relation to the feedscrew andlocated at opposite sides thereof, an elevator car, upper and lower pairs of channeled guide lugs carried by the elevator car and arranged so that laterally spaced lugs of each pair receive and'slide over the inner flange of an opposite channel, a nut segment carried by the car and having threaded engagement with the feedscrew, at least one cross-member connecting the intermediate portions of the spaced channels and maintaining the same in proper spaced relation, and a segmental feed-screw guide bearing carried by said cross-member and partially surrounding the feed-screw but being sufliciently open to permit free passage of the nut segment.

' 2. In an elevator mechanism a substantially vertical power-driven feed-screw journaled at its opposite end portions between opposed channel rails extending in parallel relation to the feedscrew and located at opposite sides thereof, an

elevator car, upper and lower pairs of channeled guide lugs carried by the elevator car and arranged so that laterally spaced lugs of each pair receive and slide over the inner flange of an opposite channel, a nut segment carried by the car and having threaded engagement with the feedscrew but surrounding less than one-half thereof, at least one cross-member connecting the intermediate portions of the opposed channel rails and maintaining the same in proper spaced relation, and a segmental feed-screw bearing carried by said cross-member and surrounding more than one-half thereof but being suificiently open to permit free passage of the segmental nut.

3. The structure defined in claim 2 in further combination with a guide rail carried by the outer flange of each of said channel rails in parallel relation thereto, a counter weight having channels at its opposite edges arranged to work over opposite guide surfaces of said last noted guide rails, sheave means above the uppermost position reached by the elevator car, and a flexible conmechanism a substantially 'T.

nection extending from the car over the sheave means to said counter weight.

4. In an elevator mechanism a substantially vertical power driven feed-screw journaled near its opposite ends between laterally spaced parallel rails extending in parallel relation to the feed-screw and having longitudinal guide surfaces, an elevator car, a pair of laterally spaced guide lugs carried by the elevator car and arranged so that the laterally spaced lugs engage the guide surfaces of opposite rails and are guided thereby for true parallel movement in respect

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