US 2510708 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
June 1950 I o. L. MARSHALL 2,510,708
PORTABLE LAMP GUARD Filed June 6, 1947 Inventor Oscar L. Marshall WWW Patented June 6, 1950 UNITED STATES PATENT OFFICE PORTABLE LAMP GUARD Oscar L. Marshall, Jamestown, Mo.
Application June 6, 1947, Serial No. 753,090
ti Figure 1 is a side elevational view of the invenother workers who require a concentration of light in a predetermined, frequently changing location, and the principal object of the invention is to provide a lamp guard, including a shade or shield, which may be easily and conveniently adjusted so that the rays of light emanating from the lamp are concentrated upon the work.
Conventional devices employed for this purpose usually assume the form of a lamp socket carrying an incandescent lamp, a wire cage mounted on the socket and surrounding the lamp, and a suspension hook provided on the cage whereby the entire device may be suspended from suitable supporting structure. These conventional devices also include a lamp shade carried by the cage or guard, and inasmuch as in this manner, the suspension hook as well as the lamp shade are rigidly secured to the cage, considerable difiiculty is frequently experienced in positioning the hook on the supporting structure in such manner that the shade protects the worker from the light and, at the same time, assists in concentrating the light rays upon the work. In other words, since the suspension hook is immovable with respect to the lamp shade, and since the position of the hook with respect to the supporting structure cannot be readily adjusted, the lamp shade frequently fails to fulfill its primary purpose, namely, that of shielding the eyes of the worker from the source of light.
It is, therefore, a further object of the invention to eliminate the above disadvantages by providing a lamp guard structure which, as aforesaid, may be easily and conveniently adjusted in accordance with the particular working conditions, so that the eyes of the worker are shielded from the source oi. light and that the light rays are concentrated upon the work.
An additional object of the invention is to provide a portable lamp guard which is simple in construction, which may be readily disassembled for purposes of changing the incandescent lamp, or the like, and which will readily lend itself to economical manufacture.
With the above more important objects in view and such other objects, as may become apparent as this specification proceeds, the in vention consists essentially of the construction and arrangement of parts as shown in the accompanying drawings in which:
Figure 2 is a cross sectionalyiew, taken substantially in the plane of the line 2--2 in Figure 3;
Figure 3 is a cross sectional view, taken sub.- stantially in the plane of the line 33 in Figure 1, and; a
Figure 4 is a top plan view of the device shown in Figure 1, the same being taken in the direction of the arrow 4 in said figure.
Like characters of reference are used to designate like parts in the specification and throughout the several views.
Referring now to the accompanying drawings in detail, the invention consists of a portable lamp guard designated generally by the reference character Ill, the same being adapted for use in association with a conventional portable lamp structure including a suitable socket ll carrying an incandescent lamp 12 which receives its supply of current through the medium of a conductor ii.
The guard Ill embodies in its construction a plurality of wire rods l4 forming a pair of complementary sections I5, it of an elongated cage ll, the same being of more or less conventional design, as will be clearly apparent from the accompanying drawings.
A suitable clamp assembly I8 is employed at one end of the cage I! for separably securing the latter to the lamp socket l I, the cage ll enclosing the lamp l2, as is best shown in Figures 1 and 4.
The essence of the invention resides in the provision of substantially U-shaped portions l9 on the ends of the rods at the remaining end of the cage, the portions l9 movably engaging a plurality of apertures 20 formed in a stationary disc 2l. It will be apparent in this manner, that the disc 2| will connect the end portions of the rods together, and at the same time, it should be understood that the apertures 20 are sufficiently large as to facilitate movement of the portions 19 therein, so that the cage sections l5, It may be opened outwardly in the direction 22 after the clamp I8 has been removed. By virtue of this structural arrangement, the cage ll may be separated from the socket II for purposes of replacing the lamp I2, or the like.
It will also be noted that an elongated shade 23, having an arcuate cross-sectional configuration, is secured in any suitable manner in one of the cage sections (IS) the shade 23 partially enclosing the lamp l2, as will be clearly understood.
The essence of the invention resides in the provision of a suspension hook 24 whereby the entire assembly may be conveniently suspended irom suitable supporting structure, the hook 24 including the usual bill portion 25 and a shank portion 26. The shank portion 26 of the hook 24 is rotatably and slidably positioned in an aperture 21 formed substantially at the center of the disc 2|, and a locking plate 28 is rigidly secured to the shank portion by welding, or the like, as indicated at 29.
The plate 28 is provided in the marginal edge portion thereof with a plurality of grooves or notches 30, these being adapted to engage or receive the U-shaped portions is of the rods l4, as is best shown in Figure 2.
Means are provided for urging the portions 19 into the notches 39, said means consisting of a compression spring 3| interposed between the aforementioned disc 2| and a cup-shaped seat 32 secured on the screw-threaded end portion 33 of the hook 24 by means of a suitable nut 34. The spring 3| urges the hook 24 and the associated plate 28 in the direction of the arrow 35. thereby engaging the notches 30 with the rod portions l9, as will be clearly apparent.
When the invention is placed in use, the entire lamp may be suspended from supporting structure by means of the hook 24, and if the relative position of the hook with respect to the supporting structure is such that the shade 23 does not shield the worker's eyes from the lamp l2, the guard may be easily and conveniently adjusted by simply grasping the entire guard structure and pulling the same downwardly as indicated at 36. During this action, the rod portions I9 will be disengaged from the notches 30, whereupon the entire cage may be rotated with respect to the hook 24, until proper adjustment of the shade 23 with respect to the eyes of the worker has been made.
As soon as the downward pulling force upon the guard is relaxed, the resiliency of the spring 3! will again engage the rod portions I9 with the notches 30, and the entire guard, including the shade, will be retained in the appropriate, predetermined position.
It is believed that the advantages and use of the invention will be clearly apparent from the foregoing disclosure and accordingly. further description thereof at this point is deemed unneces- 89-17- While in the foregoing there has been shown and described the preferred embodiment of this invention it is to be understood that minor changes in the details of construction, combination and arrangement of parts may be resorted to without Rparting from the spirit and scope of the invention as claimed.
Having descnibed the invention, what is claimed as new is:
.1. In a portable lamp guard, the combination of a set of wire rods forming an elongated cage, a disc provided at one end of said cage and formed with a plurality of apertures, end portions of said rods being substantially U-shaped and slidably anchored in said apertures whereby said rods may be spread apart and swung together to respectively open and close said cage, a suspension hook having a shank portion slidable and rotatable in said disc, a locking plate secured to said shank at one side of said disc and having its marginal edge formed with a set of notches, the U-shaped end portions of said rods being swingable in said notches when said cage.
is opened and closed, a spring seat secured to said shank at the remaining side or said disc, and a compression spring provided between said disc and said seat for urging said plate toward said disc whereby the U-shaped end portions of said rods are normally retained in said notches to prevent rotation of said cage on said hook, said rods being disengageable from said notches by sliding sa-id shank in said disc against the resiliency of said spring.
2. In a portable lamp guard having a base at the inner end adapted to be clamped on a light socket and a plurality of wires extending in generally spaced radial positions around a light bulb to the outer end of the unit, the improvement which comprises a disc at the outer end of said unit havin a plurality of spaced apertures to which said wires are connected, thereby creating a plurality of projections spaced radially about said disc; a suspension hook extending outwardly and slidably and rotatably mounted on one side of said disc; locking means secured to the shank of said hook adapted to engage said projections thereby positioning said hook and spring means on the other side of said disc for urging said locking means into engagement with said projections.
- OSCAR L. MARSHALL.
' REFERENCES CITED The following references are of record'in the file of this patent:
UNITED STATES PATENTS Number Name Date 797,872 Spencer Aug. 22, 1905 1,692,892 Floyd Nov. 27, 1928 1,958,222 Wilson May 8, 1934 2,123,807 Rothen July 12, 1938 2,178,907 Hockley Nov. 7, 1939