US2525008A

US2525008A - Releasable fastener for attaching chairs to floors

Info

Publication number: US2525008A
Application number: US51036A
Authority: US
Inventors: Louis S Zakariasen
Original assignee: Individual
Current assignee: Individual
Priority date: 1948-09-24
Filing date: 1948-09-24
Publication date: 1950-10-10
Anticipated expiration: 1967-10-10

Description

' I bet. 10,1950

L. S. ZAKARIASEN RELEASABLE FASTENER FOR ATTACHING CHAIRS T0 FLOORS Filed Sept; 24, 1948 Hm I INVENTOR LOUIS 5. ZAKARIAsEN ATTORNEKS Patented Oct. 10, 195

UNITED STATE." P

RELEASABLE FASTENER FOR ATTACH ING CHAIRS TO FLOORS This invention relatesto releasable fasteners for attaching upstanding members to a base and particularly to an easily releasable fastener for securely attaching air craft seats to the floor of the plane.

In order to clean and properly maintain commercial passenger carrying air craft, it is necessary to remove all the seats in the passenger compartment. Of necessity the seats have in the past been securely bolted to the cabin floor, and it is a slow and difficult operation to remove them.

It is an object of my invention to provide a novel and greatly improved easily releasable fastener for securely attaching upstanding members 'to a base as in attaching air craft passenger seats to the plane floor.

It is another object to provide a fastener for positively locking chairs andseats to the floor and adapted to be easily released by a specially designed spreader tool. I

It is a further object to provide a fastener capable of extremely strong and durable yet relatively light weight construction and adapted to securely attach chairs and seats to the floor and having substantially the entire mechanism con-o cealed within the respective chair legs.

These and other objects and advantages of my invention will more fully appear from the following description made in connection with the accompanying drawings wherein like reference characters refer to similar parts throughout the several views and in which;

Fig. 1 is a horizontal sectional view taken substantially along the line I-I of Fig. 3 and showing a spreader tool in operative position.

Fig. 2 is a perspective view showing my improved locking device as mounted on a chair leg; and

Fig. 3 is a vertical sectional view taken. substantially along the line 3-3 of Fig. 1 and showing the jaw members and retraction springs in closed locking position by full lines and in open expanded position by dotted lines.

As shown in the accompanying drawings, I provide an upstanding stud 5 permanently fixed to the floor 6 as by being bolted thereto by a nut I. This stud 5 has a transverse horizontally disposed groove 8 formed in the periphery thereof, and said groove 9 is spaced slightly below the top extremity of the stud 5.

The lower portion of a chair leg 9 is shown in the drawings and has a central substantially cylindrical stud receiving recess I0 extending upwardly fromthe bottom thereof. The chair leg 9 has a pair of horizontally opposed slots formed in the lower portion thereof, and these slots communicate with intermediate portions of recess III and extend therefrom respectively outwardly to the outside of leg 9. A pair of horizontally opposed clamping jaws H are respectively slidably mounted in said horizontal slots and have a pair of opposed stud gripping concave recesses I2 formed at the inner ends thereof. These recesses 22 are adapted to be received in the groove 8 of stud 5 to securely lock the chair leg 9 thereto. The outer portions of jaws II are diminished to respectively form gripping elements I3 at the outer extremities thereof and abutment shoulders I4 respectively adjacent the side walls of leg A pair of leaf retraction springs I5 are securely attached to the respective side walls of the leg 9 as by the attachment screws I6 and extend downwardly therefrom to overlie abutment shoulders I4. A pair of slots H are formed in the lower portion of said springs I5 and permitthe diminished gripping elements I3 to extend therethrough. The lower free ends of said springs [5 thereby resiliently abut the respective shoulders I4 to normally hold said jaws I I in closed or locked position. Each of the gripping elements I3 has a vertically disposed aperture it formed therethrough to permit a releasing tool such as the one shown in Fig. 1 to be inserted therein thereby tightly gripping elements I3 to permit expansion thereof against the force of springs I5. The tool shown in Fig. 1 will hereinafter be referred to by the numeral I9.

The operation of this fastener is obvious from the drawings and theforegoing description. The chair leg 9 is initially placed over the stud 5 which is received in the recess I0 and the jaw members II thereafter expanded into open position by the use of spreader tool I9 to permit the chair leg to be lowered into engagement with the floor and thereby align groove 8 of the stud 5 with the opposed jaw members II, andthereafter the jaw members i! are merely released and the springs I5 resiliently close the same into tach said leg 9 to the floor IS. The construction chair leg, and the only outstanding projections are the small smoothly rounded gripping elements l3 which extend a slight distance outwardly beyond the springs l5 to permit the spreader tool l9 to be engaged in apertures l8. It is necessary to use a spreader tool l9 because the strength of the springs l5 must be suflicient to positively lock the jaws ll together and prevent any possibility of any inadvertent releasing thereof.

It will be seen that I have provided a highly efficient easily releasable fastener adapted to positively attach the legs of a chair to the floor of an airplane or the like to facilitate cleaning and maintaining of the airplane.

It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the parts without departing from the scope of my invention.

What I claim is:

A releasable fastener for securely attaching each leg of a chair to the floor, each of said chair legs having a central recess formed at the bottom extremity thereof, each of said fasteners comprising an upstanding anchor stud adapted to be fixed to the floor and extend upwardly into said recess to permit the bottom of said chair leg to rest upon said floor and be supported thereby, the upper portion of said stud having a peripheral groove formed therein in slightly spaced relation below the top thereof, a pair of horizontally opposed jaw members mounted for horizontal shifting movement in said chair leg and having opposed stud engaging recesses formed at the inner extremities thereof and normally extending into the recess of said chair leg, a pair of external leaf spring elements each having one end respectively connected to the outside of said chair leg and the other end respectively engaging said jaw members to resiliently urge the same into closed normal position and means permitting said jaw members to be externally gripped by a suitable lever operated spreader tool to permit said jaws to be released from said stud and said chair leg released from said floor.

LOUIS S. ZAKARIASEN.

REFERENCES CITED The following references are of record in the fileof this patent:

UNITED STATES PATENTS Number Name Date 2,225,592 MacFadden Dec. 17, 1940 2,353,795 Tinnerman July 18, 1944 2,408,547 Bertschinger Oct. 1, 1946 2,448,817 McArthur Sept. 7, 1948