US 2565873 A
Description (OCR text may contain errors)
A. D. MEYER PUSH-PUSH LATCH Aug. 28, 1951 2 Shee'VS-ShGGt 1 Filed 001;. 22, 1948 A. D. MEYER PUSH-PUSH LATCH Aug. 28, 1951 2 Sheets-Sheet 2 INVENTOR. (26/192 2. 777qy'? BY Filed Oct. 22, 1948 Patented Aug. 28, 1951 2,565,873" SH-Push pA'ron Alvin D. Meyer, Kenmore, N.- Y.,l ,assignor, by v mesne assignments,
Massachusetts to Sylvahia -El ec tric Products Inc., New York, N. a corporation. of
Application October 22, 1948, Serial No. 55,950.
Claims (01. vie-5 03) f This invention relates to a so-called pushpush latch mechanism. Thismay be described as a mechanical arrangement wherein one of the,
elements can be moved .for a given distance, by
actuating an operating lever or push button, and 5 the return stroke of the mechanism is limited when the operator releases the operating lever. The return stroke is accomplished by moving the operating lever or push button a second time, whereupon, upon release of the operating lever or push button, the mechanism returns to initial position and is ready for a new cycle of operations. a
Mechanism of this type has many applications. One specifically described herein, is to control the push buttons of a radio receiver. Another is in trunk covers, doorlatches, and the like, wherein star wheel mechanism is employed. M
It is an object of this invention to provide mechanism of the class described which is simple and reliable in its action, simple to construct and install, which requires a minimum of service, 'andwhich may Joe-assembled from punch press parts, requiringno excessive tolerances.
Still other objects and advantages of my inventionwill be apparent from the specification. The features of novelty which I believe to be characteristic of my invention are set forth with particularity in the appended claims.
My invention itself, however, both as to its fundamental principles and as to its particular embodiments, will-best be understood by ref erence to the specification and accompanying drawing, in which Fig. 1 is a front elevation of mechanism in accordance with my invention, with various cover plates and other parts removed to show the construction of the elements,
Fig. 2 is a side elevation of the parts shown in Fig. 1, with some of the removed parts back in position, and Figs. 3, 4, 5 and 6 are fragmentary front elevations of the latch portion of the mechanism in successive positions in its operating cycle.
Referring now more particularly to Fig. 1, l0 designates the frame plate of the mechanism, in the embodiment of the invention about to be described, and which is for certain purposes and under certain conditions the preferred embodiment of the invention. The frame It has top ears II and bottom ears [2, provided with slots, in which are mounted for vertical movement sliders l5, operated by the operating levers or push buttons, and which in turn, in the embodiment of the invention described, operate tone control switches l3 and I4.
.The normal position of the, sliders I5 is atfthpv lower end ofrtheir travel, to which position they arebiased by springs M5,; the lower ends of whichv are securedto'the gsliders; and-the upper ends abut against earsLlZ ,Thesliders l5 carry a latchingprojection l 5a, ,and a secondprojection in,
(Fig. 2), to the latter of which is secured a leaf spring ll, the free ,end .of which passes between the bifurcations of; a bifurcated ear 22 formed on rotary latch member 20, mounted on shaft2 l.
Near the lower end of latch 2|] there is formed a forwardly extending ear 23, and at the lower end of latch there is provided a forwardly turned edge 24 and upwardly extendingflanges z i andv 4 Near the n m s er he c se lat ra ex nd ng-f n er 5c n below i 1 end of-key, is depressed;
\ a a 1 ea -zl :w il
asecond, ger zfirexi id nsth pp e ec-v ion. nich b ,7 tom ,finge 25 servesas a stop to limit thedownwa mmo em g rli lid fb l t k a oma s s dk y h operat n e rpr pu h. butt wh h enga e he slider, in this case, -key, 0 mou'nted on shaft 3],
and having: a U projecting por tion 30a. which fits under finger 15a and lifts slider [5 when the outer 30 is of the so-called In this particular case key p ano-key type, but-it will be understood that other types of key maybe employed.
. The operation of the mechanism will now :be described -.-Whe ey. I pr sssdislie 55 lifted- 5? the action ofprojection 30a and finger 150. "This lifts the bottom end of leaf spring l1 and applies pressure tending to rotate latch 29 counter-clockwise from the normal position of Fig. 1.
As latch 20 rotates counter-clockwise, and slider l5 rises, projection 15a on slider l5 moves in front of ear 23 on latch 20, and stops the rotation of latch 20 in the position of Fig. 3. Continued pressure on key 30 will produce no further movement, because the mechanism is now locked against further movement as long as pressure is applied. The slider I5 has reached the top limit of its travel, (upward movement is limited by step |5S on slider l5 engaging the underside of ear I2), and with the slider in that position, the latch 20 has reached the end of its counter-clockwise rotation. The operator now releases key 30.
When this occurs, vertical pressure on slider I5 is released, and spring 16 movesslider l5 downwardly. As the slider moves downwardly, projection l5a on slider 15 passes out of the path of ear 23 on latch 20, and spring I1 rotates latch 20 further counter-clockwise, to the position of Fig. 4, where the rotation of latch 20 is stopped,
this time by the engagement of projection l5a and flange 24a at the lower left hand of the latch 20. This is the latched position of slider I 5, in which it will remain until the key 30 is again depressed.
As the key F30 is."'depressed the :second time, slider I5 is raised from the position of Fig. 4, clearing flange 23, and permitting latch 20 to rotate further counter-clockwise to the position of Fig. 5. At this point, if pressure on key -3,0;is released, the latch 20 is out of position to stop the return of slider J5 to the position of Fig. 1, and slider l5 moves downwardly tothat position.
As it does so, pressure in leaf spring H-is built up tending to rotate latch 20 clockwise, and as soon as projection l5a has moved downwardly-out of the path of flange 23, spring I! restoreslatch 1 to starting position, as indicated in Fig.6.
In the specification, I have explained the principles of my invention and the best mode -in which I have contemplated applying those principles, so as to distinguish my invention from other inventions; and I haveparticularly pointed out and distinctly claimed the part, improvement or combination which I claim as -my invention or discovery.
- While I have shown and described certain preferred embodiments of my invention, it will be understood thatmodifications and changes may be made without departing from the spirit and scope thereof, as'will be; clear to those skilled in the art.
1. In mechanism of the class described, in
combination, a manual key, a slider mounted for longitudinal movement and-actuated by said key, an oscillatory latch mounted for swinging movement into and out of the path of said slider, and
a spring connection between said slider and-said able into and out of the path of said slider, and said latch having a radially extending arm and a plurality of ears disposed substantially on a diameter of said latch and on the same side of the pivot point thereof projecting at right angles to theplane of-said'arm" and extending toward saidslider'. r
3. The combination claimed in claim 2 in -which said ears are radially spaced from each other.
4. The combination claimed in claim 2 in which said .1atch.:has a radially extending arm and a plurality of ears extending at right angles 'to the plane of said arm and projecting toward said slider, sai'd ears being radially spaced from each ether, and said slider having a projection contacting one or the other of said ears depending onthe position of said slider.
5. In mechanism of the class described, in combinatiorna .frame, a slider mounted in'said frame for translational movement, an oscillatory latch .mounted for swinging movement into and out of the path of said s1ider,;said slider having a portion movable into and out of the path of said latch, and said latch having a portion movable into and out of the path of said slider,.ancl said latch having a radially extending arm and a plurality of cars extending toward said slider,
' said ears being radially spaced from each other,
and a spring connection between said slider and said latch, said spring connection biasing said latch for rotation in opposite directions depending on the position of saidslider.
ALVIN D. MEYER.
REFERENCES CITED The following references'are-of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 625,639 Burchell May 23, 1899 632,043 Chandler Aug. 29, 1899 1,748,881 Inaba -Feb. 25, 1930 1,906,571 Gillmore May 2, 1933 2,053,886 Williams Sept. 8, 1936 2,420,166 Corey May 6, 1947 FOREIGN PATENTS Number Country Date 348,788 Germany Feb. 18, 1922