US2896989A

US2896989A - Cam type latch

Info

Publication number: US2896989A
Application number: US687681A
Authority: US
Inventors: Yale W Ehret
Original assignee: Adlake Co
Current assignee: Adlake Co
Priority date: 1957-10-02
Filing date: 1957-10-02
Publication date: 1959-07-28
Anticipated expiration: 1976-07-28

Description

' July 2s, 1959 Y. w. EHRET Y 2,896,989

CAM TYPE LATCH Filed oct. 2, 1957 t United Statcs Patent O CAM TYPE LATCH Yale W. Ehret, Elkhart, Ind., assignor to The Adlake Company, Elkhart, Ind., a corporation of Illinois Application October 2, '1957, Serial No. 687,681

2 Claims. (Cl. 292-114) This invention relates to a' window latch construction and is more particularly concerned with improvements in a latch structure for tightly locking together a pair of window sashes, one of which is slidable relative to the other.

It is the general object of the invention to provide a latch or lock structure for use on a sliding sash window which is of relatively simple yet sturdy construction, which is highly efficient in operation, which may be easily installed on a window, which is very economical to produce, and which will withstand considerable abuse.

without requiring repair of replacement.

lt is a further object of the invention to provide an improved cam type latch construction for a pair of abutting window'sashes including a compressible sealing gasket secured to the closing edge of at least one of the sashes, which latch acts to lock the s ashes tightly together to provide an effective seal against drafts, rain, snow, etc.

It is a more specific object of the invention to provide a latch structure for a sliding sash window including a keeper pin mounted adjacent an abutting edge of one of the sashes and a latch assembly mounted adjacent the abutting edge of the other sash, the latch assembly including a cylindrical bushing eccentrically rotatable on the other sash, an elongated latch member rotatably mounted on the bushing and adapted to be pivoted into engagement with the keeper pin, and a lever secured to the bushings for pivoting the bushing from a released position to a locking position while the latch member is in engagement with the keeper pin, the eccentric mounting of the bushing acting to shift the latch member toward the latch assembly during rotation of the bushing to securely draw the sashes together and lock them tightly.

These and other objects and advantages of the invention will be apparent from a consideration of the window latch structure which is shown by way of illustration in the accompanying drawings wherein:

Fig. l is a fragmentary elevational View of a pair of slidable abutting sash members including a compressible sealing gasket on one of the abutting edges and showing the sashes in slightly open positions and the latch device with the latch member and the locking lever in released positions;

Fig. 2 is a view similar to Fig. l showing the sashes closed and the latch member in its engaged position and the locking lever in its released position;

Fig. 3 is a View similar toFigs. l and 2 showing the latch member in its engaged position and the locking lever in its locking position;

Fig. 4 is a vertical sectional view taken generally along line 4 4 of Fig. 3;

Fig. 5 is a vertical sectional view taken generally along line 5-5 of Fig. 3; and

Fig. 6 is an enlarged vertical sectional view'of the latch assembly as shown in Fig. 5.

Referring to the drawings, there is illustrated a fragrnentary portion of a double sash slidable window conlce struction including a pair of vertically disposed sashes 10 and 11 which are slidable in a horizontal direction between open and closed positions. As best shown in Fig. 4, a resilient, compressible, rubber sealing gasket 12 is secured to the abutting edge of the sash 11, the sealing gasket 12 dovctailing with the abutting edge of the sash 10. The particular window shown in the drawings is of the type that might well be found in the cab of a diesel locomotive and in such an installation the closed window must be very tightly sealed in order to keep out drafts, rain, snow, etc.

A preferred embodiment of a latch adapted to provide an effective seal in a window of this type is shown in the drawings and includes a keeper assembly 17 secured adjacent the abutting edge of the sash 10 and a 'j latch assembly 18 secured adjacent the abutting edge 26. The mounting plate 25 is provided with an upstanding harige 27 extending partially along the edge of the plate 25 farthest from the edge of the sash 11 to facilitate manipulation of the sash 11 for sliding movement. A mounting pin 28 having an enlarged head portion 29 projects from the center of the plate 25 in horizontal alignment with the keeper pin 22 on the plate 19.

As best shown in Figs. 5 and 6, a generally cylindrical bushing 35V having a longitudinally extending bore 36 formed therein and offset with respect to the axis of the bushing 35 is rotatably mounted on the pin 28, the

bushing 35 being eccentrically rotatable thereon. An elongated latch member or arm 39 has one end rotatably mounted on the bushing 35 and has a hooked portion 40 at the other end adapted to engage the keeper pin 22. An upturned flange 41 is provided on the hooked end of the latch member 39 to facilitate rotation of the latch member 39 into and out of engagement with the keeper pin 22.

Means are provided for rotating the bushing 35 relative to the pin 28 in the form of a locking lever 42 overlying the latch member 39 and having one end disposed about the bushing 35. The lever 42 is secured to the bushing 35, as by brazing at 44, Fig. 6, whereupon rotation of the lever 42 through manipulation of a knob 43 on its free end causes eccentric rotation of the bushing 35 about the mounting pin 2S. To complete the latch assembly 18, a washer 45 is disposed about the pin 28 between the bushing 35 and the mounting plate 25 and a resilient dished washer 46 is disposed on the bushing 35 between the latch member 39 and the lever 42 to maintain a slight frictional tightness in the operation of the latch. The bushing 35 is retained on the mounting pin 28 by the enlarged head portion 29 of the pin 28.

In Fig. l, the sashes 10 and 11 are shown in a slightly open position and the latch member 39 and the locking lever 42 are shown in their released positions. It is noted that in the released position of the lever 42, the axis and major body portion of the eccentrically mounted bushing 35 are disposed toward the abutting edge of the sash 1'1 with respect to the mounting pin 28. To tightly lock the closed window sashes together, the latch member 39 is first pivoted from its released position, as shown in Fig. l, to its engaged position shown in Fig. 2 wherein the hooked portion 40 is in engagement with the keeper pin 22. After the latch member 39 has been engaged With the keeper pin 22, the lever 42 is pivoted, counter-clockwise in the drawings, from its released position, shown in Figs. 1 and 2, to its locking position against the upturned flange 41 on the latch member 39, as shown in Fig. 3.

It is noted that in Vrotating the lever 42 from its released position to its locking position, the bushing 35 has been rotated relatively to the mounting pin 28 to a position wherein the axis and major body portion of the bushing 3S are disposed away from the abutting edge of the sash '11 relative to the mounting pin 28. As the latch member 39 is rotatably carried on the bushing 3S, this rotation'of the bushing 35 shifts the latch member 39 toward the mounting pin 28 thus drawing the sashes 10 and 11 toward each other and tightly locking them together. As shown by a comparison of Figs. 2 and 3, this locking action compresses the sealing gasket 12 and provides a very tight seal lwhich will eectively keep out` drafts, rain, snow, etc.

In the locking position of the lever member 42, as shown in Fig. 3, the axis of the bushing 35 is disposed substantially in a plane passing through the axes of the keeper pin 22 and the mounting pin- 28 and on the side orf the mounting pin 28 away from the keeper pin 22 to provide a positive locking action. This cam type latch provides a very effective locking device and-preventsany unlatching of the window until the locking lever 42 has been pivoted, clockwise in the drawings, to its released position against the iiange 27 on the mounting plate 25.

While I have shown and described a preferred embodiment of my invention, it is to be understood that it is capable of many modifications. It is obvious that the latch disclosed herein could be used equally well with a single, slidable sash windo-w construction with either the keeper assembly or the latch assembly being mounted adjacent the closing edge of the sash and the other assembly being mounted on the frame member of the window adjacent thereto. Additionally, this latch is not intended to be limited solely to use in a window construction inasmuch as it is equally effective for tightly locking many other relatively movable pairs of elements together. Changes, therefore, in construction and arrangement 'may be made without departing from the spirit and scope of the invention as disclosed in the appended claims.

I claim:

1. In a device for successively latching and drawing together a pair of relatively movable sash members or the like into tightly locked edgewise abutting'engagement, a latch mechanism comprising, a mounting plate attachable to one of the members adjacent the abutting edge thereof, a cylindrical mounting pin secured to said plate and projecting normally therefrom, said pin having an enlarged head portion at its outer end, a cylindrical bushing having a longitudinally extending bore extending therethrough with the axis of said bore being disposed intermediate the axis and periphery of said bushing, the bore in said bushing being of a size to receive said mounting pin whereby said bushing is freely and eccentrically rotatable on said pin intermediate said mounting plate and said enlarged head portion of said pin, an elongated locking lever having one end secured to said bushing for rotating the same relative to said mounting pin, knob means on the other end of said lever for rotating the same, an elongated latch arm having one end cylindrically bored and disposed about said bushing for free rotation relative to said bushing and the locking lever secured thereto, hook means formed on the other end of said latch arm for latching engagement with a keeper pin mounted adjacent the abutting edge of the other relatively movable member, and nger-engageable means on said latch arm for rotating said latch arm into latching engagement with the keeper pin when said bushing is in a rst position determined by said lever in which the center axis of said bushing is disposed between the keeper pin and said mounting pin, said bushing then being adapted to be rotated by said locking lever relative to said hooked latch ann from said first position to a second position in which said mounting pin is disposed between the keeper pin and the axis of said bushing, the eccentricity of said bushing during said rotation thereof by said locking lever between said first and second positions drawing the hook engaged keeper pin and said mounting pin toward each otherand providing a positive, over-center locking action for tightly locking the two relatively movable members in abutting engagement.

2. I-n a device for successively latching and drawing together a pair of relatively movable sash members or the like into tightly locked edgewise abutting engagement, a latch mechanism comprising, ya mounting plate attachable to one of the members yadjacent the vabutting edge thereof, a finger-engageable flange projecting normally from vsaid mounting plate to facilitate movement of the Y member to which the latch mechanism is attached toward andraway from vthe other one of the pair of relatively movable members, a cylindrical mounting pin secured to said plate and projecting normally therefrom, said pin having an enlarged head portion at its outer end, a cylindrical bushing having an off-center,'longitudinally extending, cylindrical bore formed therein with said bore having a Vdiameter approximately equal to the diameter of said mounting pin, said bushing being fitted on said mounting pin intermediate said mounting plate and said enlarged head portion of said pin for eccentric and free rotation relative thereto, an elongated latch arm having one end cylindrically bored and fitted over said bushing for -free rotation relative thereto, said latch arm having a hook formed at its other end whereupon said latch arm is adapted to be rotated into l'atched engagement with a keeper pin mounted adjacent to the abutting edge of the other relative movable member when the main body portion of said bushing is disposed toward .the keeper pin to latch the relatively movable'members to each other, a nger-engageable flange projecting normally from said latch member to facilitate pivoting said latch arm into and out `of latching engagement vwith lthe .keeper pin, an elongated locking lever having one :end fitted over and secured to said bushing and having a iin'ger-.engageable knob `projecting from the opposite end thereof, said latch larm and said lever being freely rotatable relative to each other, said lever being adapted to be rotated when said latch arm is in'latched engagement Iwith the keeper pin between two positions whereupon said bushing is rotated relative .to the engaged latch arm until the main body portion thereof is disposed on `the side of said mounting pin away from the keeper pin, said rotation of said bushing drawing the hookengaged keeper pin and said mounting pin toward each other and providing a positive, over-center locking action to tightly lock the two relatively movable members in abutting engagement, and a resilient dished washer disposed on said bushing between said latch arm and said lever to permit non-binding operation Vof the latch mechanism.

References Cited in the Iile of this patent UNITED STATES PATENTS