Abstract: A toy gun having a pneumatic projectile launcher for launching a foam projectile and a retractable sighting mechanism which automatically raises to an operative viewing position when the gun is cocked. The pneumatic launcher having a plunger is concealed by a sliding housing which simulates the action of an automatic weapon, and the sight is pivotally mounted to the housing. When the gun is cocked by sliding the housing rearwardly relative to the body of the gun, the sight contacts an actuator which rotates the sight to an operative viewing position. When the gun is fired, the housing moves forwardly in unison with the plunger, and the sight automatically rotates to its inoperative position.

Abstract: A toy gun for launching a foam projectile from a launch station that is offset from the axis of the launcher. The gun includes a pneumatic launcher having a retractable plunger that reciprocates in a cylinder to define a compression chamber. One or more air ports are provided to communicate air from the compression chamber to the launch station in order to eject a projectile therefrom. The plunger incorporates a hollow shaft having transparent ends which are aligned with the transparent compression chamber, thus providing a continuous line of sight through said shaft and the compression chamber for aiming the gun toward an intended target.

Abstract: There is disclosed a projectile launcher having a housing, a launch tube slidably engaged to the housing, and a spring-loaded piston that is cocked by sliding the launch tube relative to the housing. After cocking, when it is desired to launch a projectile, a trigger is pulled, thereby uncocking the spring-loaded piston and launching the projectile. The projectile launcher may include one or more appendages joined to the housing and the trigger for movement when the trigger is pulled.

Abstract: A modular rack unit for displaying greeting cards and the like comprises a base, three upstanding support members, two top rails and four panel assemblies. Each upstanding support member has its base end secured to the base so that it is substantially normal to the base's top planar surface. Two upstanding support members are end members, located at the front corners of the base and the third upstanding support member, has its base end positioned along the rear edge approximately midway between the first and second ends. The end upstanding support members are communicated to the central upstanding support member by the two top rails, so that the end upstanding support members, the central upstanding support member, the base, and the top rails form a pair of rectangular frame areas.

Abstract: An adjustable height table having a top that can be vertically adjusted to various heights by a pair of telescoping legs and a counterbalance weight mechanism which includes a weight box and weights that can be easily added or removed by the user depending on the weight carried by the table top. A locking mechanism including a spring-urged threaded half nut and a stationary threaded rod enables the table top to be locked in place once a desired height is achieved.

Abstract: Joints and connector mechanisms for use in a modular wall system which consists of a series of interchangeable panels that may be combined in various ways in order to create a business environment encompassing of a series of private offices. A joint is adapted for disposition between two sections of a movable wall for interconnecting the sections. Each section includes a panel having an elongated vertical edge defines by a pair of spaced parallel walls. The joint generally comprises two elongated vertical posts each including a mounting strip for mounting the posts to the edges of adjacent panels. A pair of spaced parallel tongues extends outwardly from the mounting strip away from the edge of the panel. First and second flexible connecting strips have first and second flange-receiving portions. In use, each of the strips is positioned between adjacent tongues of the first and second posts for receiving the tongues in each of the flange-receiving portions.

Abstract: An adjustable pedestal comprises a tubular base, a tubular collar telescopically, slidably engaging the exterior of the base, a guide tube interior to the base, an extension spring mechanism positioned within the guide tube for biasing the pedestal in an extended position, and a locking mechanism for locking the pedestal in the desired position. The base, collar, and guide tube are coaxial. The collar is movable between an extended and a retracted position with respect to the base, and the guide tube is movable with the collar between an extended and a retracted position with respect to the base. The extension spring mechanism comprises a pair of parallel, spaced-apart extension springs, the axes of which are parallel to the axes of the base, collar, and guide tube and normally biases the collar and the guide tube in their extended positions. The extension springs are in a retracted condition. Thus, when force is exerted on the top of the guide tube, the extension springs assume an extended condition.

Abstract: Track rollers are mounted to the track frame by brackets having mounting holes which are asymmetric relative to the roller shaft. This permits the rollers to be mounted in alternative positions along the frame, by turning them end-for-end, for the purpose of altering the pattern of wear caused on the track links when the links impact the rollers and for reducing impact vibrations by altering the roller spacing.

Abstract: A crawler vehicle has a pair of extra-wide high flotation tracks respectively supported on a pair of fore-and-aft extending track frames on opposing sides of the vehicle, the track frame being rigidly connected to the main frame. Rearwardly located to the rear of each track frame is a spacer mounted to the side of the track frame. A diagonal brace is mounted to the spacer. A pivot shaft communicates the two track frames such that the diagonal frames are also mounted to the pivot shaft. The spacer is comprised of a first member having a top surface and opposing outwardly extending end walls leading to respective mounting surfaces. A plurality of sidewalls are fixably mounted to the first member and the main frame. The top surface of the first member has a portion which extends above and is fixably mounted to the sidewalls of the spacer.

Abstract: Alternate embodiments of mountings are shown which include ball and ball socket segments arranged to permit universal pivoting movement between the track frame and crossbar of a crawler tractor. The arrangement further includes planar surfaces carried by the track frame or crossbar engaged with planar surfaces formed on one or the other of the ball and ball socket segments so that the end of the crossbar is permitted to slide fore-and-aft and sideways relative to the track frame.

Abstract: A compact, self-contained, portable electrolytic testing device has a housing which carries an electrical test circuit and a container of an electrolytic solution for use with electrodes of the test circuit for quickly and readily determining the presence of a given metal in a variety of metal alloys.