Laser straight liner

The utility model relates to a kind of laser straight liner, including a foundation and a base, wherein said foundation is provided with batteries and said base is provided with at least one laser projection module. Said base and said foundation are connected in the way that is 360 degrees rotatable. One side of said foundation that faces said base is provided with the anode and cathode conduction rings that can connect batteries, and one side of said base that faces said foundation is provided with two contact pieces that can connect various laser projection modules and also can touch the anode and cathode conduction rings, thus realizing the conduction-wire-free connection between said laser projection modules and said batteries. This utility model makes said laser projection modules freely rotatable on said foundation, and thus the rotated angle during marking can be accurately controlled, ingenious and reasonable in design and convenient in operation. The lower-end transparent shell of cavity is provided with a cross scale, and the crossing point of said cross scale can be superposed with the intersection projection of the counter-extension lines of the laser beams emitted by various said laser projection modules, thus ensuring a accurate positioning.

FIELD OF THE TECHNOLOGY

The present utility model relates to a laser straight liner.

BACKGROUND ART

Laser Straight Liner is usually adapted for use in the field of construction and decoration layout, mainly including a foundation and a base, wherein said base is provided with laser projection modules. In practical use, these existing Laser Straight Liners normally suffer from some certain disadvantages that the laser beam emitted by the instrument is permanently fixed relative to the instrument itself, and in order to rotate the angle during marking, user must turn the whole instrument. In this way the position of the straight liner may easily suffer from deviation, and thus the marking error occurs. Moreover, those straight liners are not convenient for user to get the desired rotated angle.

DESCRIPTION OF THE UTILITY MODEL

It is the object of this utility model to introduce a Laser Straight Liner that can provide accurate rotary marking without the need of turning the whole instrument. The technical proposal for realizing the intention of this utility model is described as follows:

A Laser Straight Liner includes a foundation and a base, wherein there are batteries provided in said foundation and there is at least one laser projection module installed on said base. Said base and said foundation are connected in the way that is 360 degrees rotatable, and there are anode and cathode conduction rings provided on one side of said foundation that faces said base, and there are two contact pieces provided on one side of said base that faces said foundation, wherein said two contact pieces can be connected with various laser projection modules and also can touch said anode and cathode conduction rings, to realize the conducting-wire-free connection between said laser projection modules and said batteries.

Said foundation and said base of said Laser Straight Liner are both provided with columnar cavities in the middle, wherein the upper-end shell of said base's cavity and the lower-end shell of said foundation's cavity are both made of transparent materials.

Two to five laser projection modules are provided on said base of said Laser Straight Liner.

Said cavity's lower-end shell of said Laser Straight Liner's foundation is marked with cross scale, and the crossing point of said cross scale can be superposed with the intersection projection of the counter-extension line of the laser beams emitted by various said laser projection modules.

Said foundation of said laser straight liner is provided with scale in outer surface.

This utility model can come to some positive effects as follows:1. Said base of this utility mode can make said laser projection modules 360 degrees rotatable on said foundation, and said laser projection modules and said batteries can be connected through the touch between said contact pieces and said anode, cathode conduction rings, thus to realize the conduction-wire-free connection said laser projection modules and said batteries. It features compact construction, ingenious and reasonable design and convenient operation. Said scale on the outer surface of said foundation can ensure accurately controlling the rotated angle during marking.2. In this utility model, there is columnar cavity in the middle, and the upper-end shell and the lower-end shell of said cavity are made of transparent materials; moreover, said transparent lower-end shell is provided with cross scale, wherein the crossing point of said cross scale can be superposed with the intersection projection of the counter-extension line of the laser beams emitted by various said laser projection modules, thus to ensure a accurate positioning.

DESCRIPTION OF THE PREFERRED EMBODIMENT

As shown in theFIG. 1andFIG. 2, this utility model involves a foundation1and a base2, wherein there are batteries provided in said foundation1and laser projection modules3provided on said base2, generally including three laser projection modules3that are evenly distributed thereon. Said base2is connected onto said foundation1in the way that is 360 degrees freely rotatable. Said laser projection modules3need powering by said batteries. On one side of said foundation1that faces said base2, there are anode and cathode conduction rings11that can connect the anode and cathode of said batteries respectively. On one side of said base2that faces said foundation1, there are two contact pieces21that can electrically connect said various laser projection modules3and meantime can touch the anode and cathode conduction rings respectively. During the rotation of said base2, said contact pieces21can separately slide along their respective conduction rings11, thus ensure that said various laser projection modules3on said base2can electrically connect said batteries in said foundation1all the time, thus to realize the conducting-wire-free connection between said laser projection modules3and said batteries.

Both said foundation1and said base2have one columnar cavity in the middle, wherein both the upper-end shell22of said cavity of said base2and the lower-end shell12of said cavity of said foundation1are made from transparent materials. Moreover, there are cross scale13marked on said lower-end shell12of said cavity of said foundation1, and the crossing point of said cross scale13can be superposed with the intersection projection of the counter-extension lines of the laser beams emitted by said various laser projection modules3. There is scale14provided on the outer surface of said base1.

New drawingFIG. 4shows a fully assembled version of the rotary laser marking device of the present invention. As shown inFIG. 4, the rotary laser marking device includes an upper shell30which overlies the base2. The base2includes a transparent actuator23, which enables a user to view the cross scale13from above. Transparent actuator23can be depressed in order to extend a series of feet31, shown inFIG. 9, which include an adhesive material that it enables the rotary laser marking device to be secured to a surface such as a wall or floor. The upper shell30also includes a series of markers32, each of which defines a recess that can be aligned with one of the angle indicators provided on scale14, to provide an indication of the angle of upper shell30relative to foundation1.

Upper shell30also includes a series of finger grip recesses34that can be gripped by a user to facilitate rotation of upper shell30relative to foundation1. A pair of windows36are also provided in upper shell30, to provide visibility of the vials that are carried by base2. Upper shell30also includes a series of protrusions38, each of which defines an opening aligned with one of the projection modules3, to enable a laser beam from the projection modules3to pass to the exterior of upper shell30. A power switch40is provided on base2, and projects through an opening formed in upper shell30. Power switch40selectively provides power from batteries housed within foundation1to the projection modules3.

The markers32are provided in the locations of protrusions38, and are in alignment with the projection modules3so that the recess in each marker32corresponds to the location from which the laser beam is emitted through the opening in the protrusion38at each marker32.

New drawingFIGS. 5-8show the side elevation views of the rotary laser marking device of the present invention.

New drawingFIG. 9illustrates the underside of the rotary laser marking device of the present invention. The foundation1includes a series of bumps or protrusions42that are adapted to engage a surface. When the feet31are extended by depression of actuator23, the feet31extend beyond protrusions42so as to secure the rotary laser marking device to the surface. The underside of the foundation1also includes a removable battery cover44, which includes a central opening within which the window providing the cross scale13is located. The battery cover44includes a conventional latch46, which enables the battery cover to be selectively removed from and engaged with the foundation1. The battery cover44functions to cover a battery cavity within which a series of batteries are received. The batteries are thus carried by foundation1, and battery cover44provides quick and easy access to the batteries for replacement when needed.

New drawingFIG. 10illustrates a top plan view of the rotary laser marking device of the present invention, in which the parts and components that have been described previously are illustrated. As referenced above, the actuator23is made of transparent material which allows for the cross-scale13to he seen through the actuator23and the columnar cavity25defined by an elongated annular wall27formed in the base and an elongated annular wall29formed in the foundation1.