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A lock for a retractable cover which overlies a bed of a pickup truck has a cover-connectable housing and a handle that pivots relative to the housing for clamping a pointed tip of a flexibly mounted fastener into engagement with a nearby member such as a guide rail extending along one side of the b

A lock for a retractable cover which overlies a bed of a pickup truck has a cover-connectable housing and a handle that pivots relative to the housing for clamping a pointed tip of a flexibly mounted fastener into engagement with a nearby member such as a guide rail extending along one side of the bed of a pickup truck to retain a housing-connected retractable cover in a chosen position. A push button trigger pivoted on the handle is depressable to unlatch the handle and thereby release the clamping action of the handle. A torsion spring biases the trigger relative to the handle. A compression spring biases the handle relative to the housing. A leaf spring flexibly mounts the fastener on the handle. A key-operated plug assembly may retain the trigger in a latched position.

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1. A lock comprising a housing; a handle that is pivotally connected to the housing for movement between a closed position wherein the handle positions a pointed tip of a fastener carried by the handle to engage with a surface along which the housing is movable, and an open position that positions t

1. A lock comprising a housing; a handle that is pivotally connected to the housing for movement between a closed position wherein the handle positions a pointed tip of a fastener carried by the handle to engage with a surface along which the housing is movable, and an open position that positions the pointed tip out of engagement with the surface; a torsion spring interposed between the handle and the housing biasing the handle toward the open position; a trigger pivotally connected to the handle for movement between an unlatched position wherein the trigger disengages a formation of the housing, and a latched position wherein the trigger engages the formation to retain the handle in the closed position; a compression spring interposed between the trigger and the handle for biasing the trigger toward the latched position; and a stiff yet bendable leaf spring connected to the handle and biasing the pointed tip of the fastener into engagement with the surface when the handle is in the closed position. 2. The lock of claim 1 in which the trigger defines a push button that is accessible through an opening defined by the handle, and that is depressible to pivot the trigger away from the latched position in opposition to the action of the compression spring to release the handle from the closed position. 3. The lock of claim 2 wherein the leaf spring is an elongate piece of spring steel to which is welded an internally threaded bushing, the fastener is threaded into the bushing, and the pointed tip of the fastener projects from the bushing. 4. The lock of claim 3 wherein the fastener is a set screw that defines the pointed tip. 5. The lock of claim 3 wherein the handle has an opening into which the bushing loosely extends, and from which the pointed tip of the fastener projects. 6. The lock of claim 3 wherein the trigger is a generally L-shaped member having a push button forming one leg of the L-shaped member, and having a depending portion forming another leg of the L-shaped member, with the depending portion extending substantially perpendicular to the one leg, and with the torsion spring being positioned on an opposite side of the depending portion from the compression spring. 7. The lock of claim 6 wherein the compression spring has one end region that extends into a recess defined by the depending portion, and an opposite end region that engages a portion of the handle. 8. A lock having a housing; a handle that pivots relative to the housing between a closed position overlying the housing, and an open position extending away from the housing; a torsion spring interposed between the handle and the housing and biasing the handle toward the open position; an L-shaped trigger that pivots relative to the handle between an unlatched position disengaging a formation of the housing, and a latched position engaging the formation of the housing to releasably retain the handle in the closed position; a compression coil spring interposed between the trigger and the handle and biasing the trigger toward the latched position; and a leaf spring connected to the handle and flexibly supporting a fastener having a pointed tip relative to the handle. 9. The lock of claim 8 wherein the leaf spring is an elongate piece of spring steel having one end region fastened to the handle, and an opposite end region that supports the fastener. 10. A lock having a recess-defining housing mountable on a closure that is movable along a guide rail, a handle pivotally connected to the housing and movable relative thereto toward and away from a closed position overlying the recess, a trigger pivotally connected to the handle and movable relative thereto toward and away from a latched position where the trigger retains the handle in the closed position, with the handle supporting a leaf spring that carries a threaded fastener and deflects when the handle is in the closed position to biasingly clamp a tip of the threaded fastener into engagement with the guide rail to prevent relative movement of the closure and the guide rail. 11. The lock of claim 10 additionally including a key cylinder carried by the handle and having a key-operated plug assembly movable toward and away from a position that blocks movement of the trigger from the latched position. 12. The lock of claim 10 additionally including a torsion spring biasing the handle away from the closed position, and a compression coil spring biasing the trigger toward the latched position. 13. The lock of claim 12 wherein the torsion spring has coils that encircle portions of a pivot pin that pivotally connects the handle to the housing. 14. The lock of claim 12 wherein the compression spring is interposed between portions of the handle and the trigger. 15. The lock of claim 14 wherein the trigger has a button portion that extends through an opening defined by the handle at a time when the handle is in the closed position, and wherein the button portion is depressable relative to the opening to release the handle from the closed position. 16. The lock of claim 10 in which the threaded fastener is adjustable relative to the leaf spring to modify an extent to which the leaf spring deflects while biasingly clamping the tip of the threaded fastener into engagement with the guide rail when the handle is in the closed position. 17. The lock of claim 10 in which the handle defines an opening through which the tip of the threaded fastener extends toward the guide rail when biased by the leaf spring into engagement with the guide rail. 18. The lock of claim 10 wherein the tip of the threaded fastener is pointed. 19. The lock of claim 18 wherein the threaded fastener is a set screw. 20. The lock of claim 19 wherein the set screw is threaded through a bushing that is welded to the leaf spring.