초록 ▼

A latch of the pull-up type for a cabinet door is latched and unlatched by turning the latch handle in one direction or the other. When the door is in latched position, rotating the latch handle in the unlatching direction initially causes a spring-biased shaft, which carries a latching pawl, to mov

A latch of the pull-up type for a cabinet door is latched and unlatched by turning the latch handle in one direction or the other. When the door is in latched position, rotating the latch handle in the unlatching direction initially causes a spring-biased shaft, which carries a latching pawl, to move axially inwardly. This inward movement of the shaft is permitted because a cam in the handle is moved rotationally to present downwardly sloping cam surfaces to opposite ends of a cam-follower pin which is mounted on the shaft near its outer end. The shaft is prevented from rotating on its own axis until a motion-control cross pin, which is also mounted on the shaft, is moved inwardly a sufficient distance to escape from axial motion-control slots in a support sleeve which is mounted on the door at an opening therein and through which the shaft passes. As soon as the motion-control pin emerges from the motion-control slots, it is able to move laterally into lateral arcuate motion-control recesses in the support sleeve, thereby to allow the shaft and the latch pawl to turn out of the way of the cabinet frame. To latch the door, the action described takes place in reverse order.

대표청구항 ▼

1. A latch having a pull-up action for developing a compressive force between a movable door and a fixed housing member, said latch comprising: a. a latch body adapted to be mounted non-rotatably on a door; b. said latch body including a sleeve adapted to project inwardly through an opening in s

1. A latch having a pull-up action for developing a compressive force between a movable door and a fixed housing member, said latch comprising: a. a latch body adapted to be mounted non-rotatably on a door; b. said latch body including a sleeve adapted to project inwardly through an opening in said door; c. an elongated shaft extending through and supported in said sleeve for axial and rotatable movement with respect thereto; d. said shaft having a head portion and a threaded portion extending beyond said sleeve; e. a latching pawl mounted on said threaded portion of said shaft for axial and angular movement with said shaft; f. a rotatable handle having a cavity into which said head portion of said shaft extends; g. a cam-follower cross pin carried by said head portion of said shaft; h. an annular cam member within said handle cavity for rotatable movement with said handle, said cam having an annular cam surface having at 180° spacing two peak points, two low seats, and sloping surfaces therebetween, said low seats having steeply rising cam surfaces on both sides thereof; i. spring means biasing said shaft axially in an unlatching direction, for maintaining said cam-follower pin in engagement with the camming surface of said cam; j. a motion-control cross pin carried by said shaft on a portion thereof within said sleeve; k. a pair of axially extending motion-control slots in said sleeve for receiving the opposite ends of said motion-control cross pin; l. a pair of laterally extending arcuate motion-control recesses in said sleeve for receiving the opposite ends of said motion-control cross pin when said shaft is rotated; m. the structural arrangement being such that when said rotatable handle and cam are at their limit positions in the latching direction, the opposite ends of said cam-follower cross pin are positioned on high portions of said cam surface just beyond said peak points, said shaft is in an outward position, said spring means is compressed, the opposite ends of said motion-control cross pin are within said axial motion-control slots of said sleeve and said latching pawl is in engagement with said fixed member, whereby said closure member is latched; n. the structural arrangement being such that when said handle and cam are rotated in an unlatching direction from their limit latching positions, opposite ends of said cam-follower cross pin first pass said peak points on said cam surface and then move down sloping cam surfaces into the low seats, thereby permitting said spring-biased shaft to move axially in its biased direction, thereby moving opposite ends of said cam-follower cross pin through said axial motion-control slots to open ends thereof and into alignment with said lateral arcuate motion-control recesses; and o. the structural arrangement being such that further rotation of said handle and cam in an unlatching direction causes said steeply rising portions of said cam surfaces to engage opposite ends of said cam-follower cross pin, thereby to move said cam-follower pin rotationally, thereby to rotate said shaft on its axis and to cause opposite ends of said motion-control cross pin to enter into said lateral arcuate motion-control recesses, whereby said latching pawl is positioned out of alignment with said fixed member, thereby allowing opening of said door. 2. A latch according to claim 1 wherein: a. a bushing supports said shaft in said sleeve; b. said motion-control cross pin secures said bushing to said shaft; c. said spring means is a compression spring embracing said shaft between said latch body and said bushing. 3. A latch according to claim 2 wherein; a. a cap is placed over one end of said shaft; b. said cam-follower cross pin secures said cap to said shaft. 4. A latch having a pull-up action for developing a compressive force between a movable door and a fixed cabinet, said latch comprising: a. a shaft adapted to project through an opening in a door; b. a latch body fixed mounted on said door adjacent said opening for supporting said shaft for axial and angular movement; c. a latching pawl carried by said shaft; d. a handle supported on an end portion of said shaft; e. an annular cam carried by said handle, said cam having a surface having at least two peaks, at least two low seats, and sloping surfaces therebetween; f. a cam-follower pin secured to and projecting laterally in both directions from said shaft; g. means biasing said shaft axially for maintaining opposite ends of said cam-follower pin in engagement with said cam surfaces; h. a motion-control pin mounted in fixed position on, and projecting laterally in both directions from, said shaft; i. motion-control slots positioned axially in said latch body for receiving opposite ends of said motion-control pin for preventing angular movement of said shaft when ends of said control pin are within said motion-control axial slots; j. motion-control recesses positioned angularly in said latch body for receiving said opposite ends of said motion-control pin and for preventing axial movement of said shaft when said ends of said control pin are within said recesses; and k. each of said motion-control slots and motion-control recesses intersecting, each of said slots having a sidewall which projects into its intersection and defines one end of one of said recesses, said sidewall functioning as a stop for angular movement of said control pin in said recess. 5. A latch according to claim 4 wherein said sloping cam surfaces are steeply inclined on each side of each of said low seats. 6. A latch having a pull-up action for developing a compressive force between a movable door member and a fixed member, said latch comprising: a. a latch body adapted for non-rotatable mounting on one of said members, said latch body having a generally cylindrical bore substantially perpendicular to the surface of said one member; b. a handle mounted for rotation at an outer end of said latch body, said handle having a generally cylindrical bore coaxial with said bore of said latch body; c. a shaft disposed within and coaxial with said bore of said latch body and said bore of said handle, said shaft extending beyond said latch body; d. means provided on one end of said shaft to engage said one member when said shaft is at a predetermined position of rotation about its axis; e. means provided between said latch body and said shaft for transmitting motion from said handle to said shaft; f. means provided between said latch body and said shaft for limiting both relative rotation and relative axial translation of said shaft with respect to said latch body and for preventing axial translation during rotation and preventing rotation during axial translation, the position of said shaft with respect to said latch body at one of the limits of rotation corresponding with the position of said shaft with respect to said latch body at one of the limits of axial translation, thereby to constitute a transitional position in the motion of said shaft with respect to said base; and g. means provided between said shaft and said handle for causing, in response to relative rotation of said handle with respect to said latch body, either rotation of said shaft with respect to said latch body or axial translation of said shaft with respect to said latch body, the motions being sequential as determined by the aforesaid limits of motion of said shaft with respect to said latch body. 7. The latch according to claim 6 wherein said means between said shaft and said handle for transmitting motion from said handle to said shaft includes a first cross pin passing through, at a right angle to, and near the outer end of, said shaft in engagement with an outwardly facing cam surface within said bore of said handle, a spring engaging said base and said shaft for biasing said shaft inwardly and maintaining engagement of said cross pin with said cam surface and of said handle with said latch body. 8. The latch according to claim 7 wherein said means between said latch body and said shaft limiting the motion of said shaft with respect to said latch body includes a second cross pin passing through said shaft, at a right angle to said shaft, and inward of said first cross pin, said second cross pin being in engagement with two diametrically opposed sector-shaped recesses which are provided on the inner end of said latch body communicating with two diametrically opposed axially outward extending slots which are provided within said bore of said latch body. 9. The latch according to claim 8 wherein one end of said shaft member is diametrically enlarged such as to substantially fill one end of said bore in said handle, thereby to serve as a visual indicator of the axial position of said shaft with respect to said handle. 10. The latch according to claim 9 wherein said diametrically enlarged end of said shaft is a separate cap member attached to said shaft by means of said first cross pin. 11. The latch according to claim 7 wherein said spring consists of a coiled compression spring encircling said shaft, within said bore of said latch body, the one end of said spring resting upon a radially extending step which is provided in said bore of said latch body and the other end of said spring resting upon an end of an annular bushing which is attached to said shaft by means of said second cross pin. 12. The latch according to claim 7 wherein said means provided on an end of said shaft to engage said fixed member consists of a radially extending pawl member adjustably attached to said shaft by means of nuts engaging threads on the surface of said shaft. 13. The latch according to claim 7 wherein the rotational motion of said handle with respect to said latch body is limited by means of sector-shaped projections on said handle engaging sector-shaped projections on said base. 14. In a pull-up latch mechanism in which a latch pawl is to be moved both rotationally and axially on its mounting shaft: a. a fixed latch body having a generally cylindrical bore; b. a shaft supported in said bore and projecting axially in both directions therefrom and having a latch pawl mounted on a shaft projection; c. spring means biasing said shaft in one direction; d. an annular cam mounted coaxially relative to said shaft; e. a cam-follower cross pin secured to said shaft and maintained against said cam by said biasing means; f. means for applying a torque force to said cam for moving said cam rotationally; and g. means responsive to rotational movement of said cam for sequentially transmitting rotational and then axial motions to said shaft, in said order or in the reverse order, and for translating from the initial to the subsequent form of motion, all in response to rotational movement of said cam in one direction. 15. In a latch mechanism according to claim 14, wherein said means for sequentially transmitting rotational and axial motion to said shaft, in that order or in reverse order, includes: a. a second cross pin secured to said shaft spaced axially from said first cross pin; b. a pair of diametrically opposed axially extending slots in said latch body adapted to receive opposite ends of said second cross pin; c. a pair of diametrically opposed laterally extending sector recesses in said latch body adapted to receive opposite ends of said second cross pin; and d. the ends of said axial slots intersecting with the ends of said lateral recesses at a translation position. 16. In a latch mechanism according to claim 15 wherein said shaft is supported in said latch body by a bushing, and wherein said second cross pin secures said bushing to said shaft. 17. In a latch mechanism according to claim 16 wherein said biasing means is a coil compression spring which embraces said shaft and bears against said bushing at one end and against said fixed latch body at the other. 18. In a latch mechanism according to claim 17 wherein a cap is provided over one end of said shaft and is pinned to said shaft by said cam-follower cross pin. 19. In a latch mechanism according to claim 18 wherein said torque-force applying means is a handle having a cavity having an open end, wherein said cap is fitted within said handle cavity, and wherein the axial position of said cap relative to one end of said handle cavity is indicative of the axial position of said shaft. 20. In a latch mechanism according to claim 19 in which said biasing means urges said shaft in the unlatching direction. 21. In a pull-up latch mechanism in which a latch pawl is to be moved both rotationally and axially on its mounting shaft: a. a latch body having an annular sleeve and a cylindrical bore; b. a shaft supported in said sleeve and projecting in at least one direction therefrom and having a latch pawl mounted on said shaft projection for axial and rotational movement with said shaft; c. a pair of diametrically opposed axially extending slots in said sleeve; d. a pair of diametrically opposed laterally extending slots in said sleeve; e. each of said axial slots intersecting with one of said lateral slots at a motion translation position; f. a rotatable annular cam positioned coaxially relative to said shaft; g. a cross pin secured to said shaft, opposite ends of said cross pin being maintained in engagement with said cam; and h. means connected to said cam and responsive to torque force applied thereto for moving said cam rotationally, thereby, in response to said cam being moved rotationally in the same one direction, to transmit rotational and axial motions sequentially to said shaft, in that order or in reverse order depending upon the direction of rotation of said cam. 22. In a pull-up latch mechanism according to claim 21 wherein biasing means are provided for biasing said shaft in one direction for maintaining said opposite ends of said cross pin in engagement with said cam. 23. In a latch mechanism according to claim 22 in which said biasing means urges said shaft in the unlatching direction.