US2577348A - Door lift - Google Patents

Description

Dec. 4, 1951 K. P. MOLAUGHLIN 2,577,348

DOOR LIFT Filed July 11, 1946 2 SHEETSSHEET 1 ,ATTORNEY M my lNVi-INTOR Kenneth, P. McLaughlin Dec. 4, 1951 K. P. MCLAUGHLIN 2,577,348

DOOR LIFT Fil ed July 11, 1946 2 SHEETS--SHEET 2 INVENTOR. Kenneth P McLaugh hn,

ATTO RN EY forth. g

In order that my invention may be better un-"" Patented Dec. 4, @951 UNITED STATE S PATENT OFFICE DOOR LI FT Kenneth P. McLaughlin, Wichita, Kans. Application July 11, 1946, Serial No. 682,769

vide a mechanism of this kind which, in addi-' tion to permitting conven ent raising or lifting of a door from within the building structure, operates with equal facility to unlatch the door.

The invention consists in the details of construction and in the combination and arrangement of the several parts of'my improved door lift whereby certain important advantages are attained, as well be hereinafter more fully set clerstood, I will now proceed to describe the same with reference to the accompanying drawings, wherein:

Figure 1 is a view in perspective and of a diagrammatic character illustrating a door lifting means constructed in accordance with an embodiment of the invention;

Figure 2 is a diagrammatic view in side elevation illustrating in full lines the door in fully raised position, the lower or closed position of the door being indicated by broken lines;

Figure 3 is a fragmentary elevational view of the operator for the latch mechanism; and

Figure 4 is a view in sde elevation of Figure 3 with certain of the parts separated.

As disclosed in the accompanying drawings, D denotes a door of a conventional type employed in connection with garages and which is mounted in a well known manner for upward and inward swinging movement.

The jambs l of the doorway between which the door D operates are provided in the lower portions thereof with the inwardly facing keepers 2 provided with downwardly facing lugs 3 under which are adapted to engage the sliding bolts 4, carried by the door D, when the door is in its lowermost position. When the bolts 4 are engaged below the lugs 3, it is obvious that thedoor D cannot be lifted or raised.

The bolts 4 are at opposite sides of the door D and in longitudinal alignment and are slidably held by the guide straps 5. These bolts 4 are upon the inner side of the door D.

Disposed through the door D substantially midway between the bolts 4 is a shaft 6, the outer extremity of which carries an operating crank or handle 1 while the inner extremity of the shaft 6 is disposed centrally through an operating bar 8. This bar 8 is mounted upon the shaft 5 for free rotation.

The opposite end portions of the bar 8 have secured thereto, as at M, the extremities of the pull members I5 which may be of wire or other material and the opposite end portions of said members are secured, as at Hi, to the inner extremities of the bolts 4.

As is believed to be obvious, turning movement of the shaft 6 in one direction will result in a locking of the bar 8 in a direction to retract the bolts 4 sufliciently to free the same from the lugs 2, so that the desired lfting or raising ofthe door D may be accomplished.

The bar 8 is held against displacement from upon the shaft 6 by a washer or disk 9 held against the outer end of the shaft 6 by the headed bolt II] which threads through the center of the washer or disk 9 into the adjacent extremity of the shaft 6.

Fixed to the shaft 6 upon the inner side of the door D and closely adjacent to the door is a depending arm ll press-fitted or otherwise so applied to the shaft 6 to rotate therew th. The lower extremity of this arm II is provided with an outwardly directed lug l2 which engages the bar 8 from below at either side of the shaft 6 dependent upon the direction of rotation of the shaft 6.

The bar 8 to one side of the shaft 6 has operatively engaged therewith an upstanding shackle ll with wh ch is engaged an extremity of a pull cable l8. This cable I8 is disposed upwardly along the inner sideof the door D and is freely disposed through an opening [9 provided in the top cross member 28 of the door which is disposed at the inner side thereof.

On the top of the door D and fore and aft of this opening l9 are the rollers 2| rotatably supported between the upstand ng brackets 22 rigid- 1y secured upon the top of the door D. The cable I8 passes up between these rollers 2| which provide antifriction guide means and said cable I8 is continued over suitably positioned guide rollers 23 carried by the top structure of the building, such as a garage, and terminates in a depend ng cable length I 8' which is adapted to be grasped by a person within the garage whereby, upon pull being imposed upon the cable l8, the door D will be lifted or raised.

This operation can be readily performed by an occupant of a car within the garage structure.

It is to be noted that the arrangement of the cable I8 is such that 'as pull is imposed thereon, the door, after being raised a predetermined distance, will be swung backwardly sufiicient to permit the same to assume a substantially horizontal position by gravity.

When the shaft 6 is rotated from without by the crank or handle I, the contact of the lug [2 from below with the arm 8 will rock the arm in a direction resulting in the retraction of the bolts 4. By having the arm or bar 8 freely mounted on the shaft 6, a person within the building struc ture can readily retract the bolts 4 by the independent rocking of the arm or bar 8 on the shaft 5. 7

When the door is in its closed and locked position, the crank or handle member 1 is substantially vertically disposed and the door D adjacent to this position of the crank or handle member .1. is provided with an outstanding eye member'fl to permit the use of a padlock or thelikefor posi tively holding the shaft 6 against rotation.

From the foregoing description it is thought to be obvious that a door lift constructedaim 3213-1 cordance with my invention is particularly well adapted for use by reason of the convenienceand .facility with whichit may be assembled and'operated.

I claim: a

In adoor construction of the type-comprising a one piece door body and pivot means supporting. the door body to swing. .on a horizontal axis from a vertical .closedposition to an overhead horizontal open position; a latch releasing. and door shifting mechanism comprising a long horizontally disposed plate pivotally supported inter.- mediate its ends on the inner side of thedbor body to turn on a horizontal axis perpendicular to the face of the. the door, means for coupling each end of the plate with door latching means whereby oscillation. of the plate aetuates said means, a pull cable connected at one end to the plate between the pivot therefor and a coupling means by which pull on the cable will effect the oscillation of the plate and actuation of door latching means connected therewith, a pair of guides at the top of the door above said plate between which said cable extends, a guide pulley over the top of which said cable passes, said guide pulley being supported at an elevation above thehorizontal position of the door and at such position inwardly from the door opening that the said guides move rearwardly beneath and past the pulley position in the movement of the door to the said horizontal open position carryingrajpartt-of the cable across the underside of the puIIe and-guide pulleys for the cable supported at the elevation of the first pulley and reai-nwardly therefrom with respect to the said door opening. V

' :P. McLAUGHLI-N.

REFERENCES The following references 'are of; recordin'the file of this patent:

UNITED STATES Number. Name Date.

1,588;663' Collins June 15,.1926 l,94fi',,970. Grandgent Feb. 13 1934 1,964,114 Gerlach..et.al.. l. uJune26, 1934 2,040,080 Collins May'12, 1936 2,091,950 J ohnsonl Nov. 2, 1. 93? 2,124,969 Bagley-etal. July 26, 1938 2,344,276 Thompson Mar. 14, 194:4

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