US2215810A - Antenna unit with universal mounting - Google Patents

Description

P 24, 1940' A. FENER ET AL ANTENNA UNIT WITH UNIVERSAL MOUNTING 1940 2 Sheets-Shes; l

Fild Feb. 12

.Iliiii IN ll! INVENTORS ALFRED FENER JOHN ALES] AT ORNEY A. FENER ET AL ANTENNA UNIT WITH UNIVERSAL MOUNTING Filed Feb. 12, 1940 2 Sheets-Sheen 2 nag INVENTORS ALFRED FENE'R JOHN ALESI ATTORNEY Patented Sept. 24, 1940 UNlTED STATES ANTENNA UNIT WITH UNIVERSAL MOUNTING Alfred Fener, Brooklyn, and John Alesi,

' New York, N. Y.

Application February 12, 1940, Serial No. 318,410

14 Claims.

The present invention relates to antennae, and, more particularly, to an antenna of novel and improved character adapted to be mounted on a restricted supporting surface in a readily and continuously adjustable manner.

As those skilled in the art know, antennae of the rod or tubular type became increasingly popular in the last few years due to their relatively simple construction, small dimensions, and due to the good reception they gave. Particularly the small dimensions of the rod type antennae permitted to mount the same in a position where they were further removed from local sources of noise and of interference. These antennae were generally constituted of a metal rod or of a plurality of telescoping tubular elements, the lowermost portion of which was mounted on the roof of a building, on a window sill, wall, and the like, Although these antennae, if properly mounted, provided good reception and were inexpensive enough, difficulty was experienced in mounting the antennae on the available supporting surfaces. Obviously, in practical installations a great variety of supporting surfaces was encountered. Thus, it was frequently desirable to mount the rod antenna on windows, gabled roofs, chimneys, parapet walls, soil pipes, fences, trees, wash line posts, and various other surfaces of a more or less irregularcharacter. As the brackets generally supplied with conventional rod type antennae were not adaptable to such wide variety of conditions, considerable difliculty was experienced in properly mounting the antenna. Frequently, special mounting brackets had to be made up to suit the particular installation contemplated and, of course, caused loss of time and greatly increased the cost of the installation. In fact, this difficulty of mounting interfered with the general applicability of this type of antenna and discouraged its use on a large scale. This difliculty was further accentuated by the circumstance that the quality and the strength of the reception with this type of antenna is influenced to a sub-stantial extent by the angle which the antenna encloses with the vertical. As is known, the distribution of the electromagnetic field of the transmitted radiating energy is determined by a large number of factors, such as the arrangement and composition of surrounding objects, the direction of propagation of the electromagnetic waves, etc., and in order to obtain optimum reception in the selected position, it was necessary to adjust the antenna to a predetermined and critical angle. Such adjustment was difficult, if not altogether impossible, with conventional mounting dew'ces, so that it was practically impossible to operate the antenna under the most favorable conditions. Moreover, coupling transformers for the purpose of improving reception and reducing noise were employed in connection with antennae of the described character to a continuously increasing extent. These coupling transformers had to be mounted in proximity to the antenna and thus again increased the difiiculties of installation as the coupling transformer 0 enclosed in a suitable casing had to be mounted on or in proximity to the antenna and in addition had to be wired to the antenna proper with obvious and additional trouble and expense. All of the foregoing circumstances greatly increased the 15 total cost and difliculty of installing and maintaining antennae of the described character. Although these difiiculties were well known in the art and from time to time various suggestions and proposals were made to solve this vexatious prob- 20 lem, none, as far as we are aware, of these suggestions and proposals was completely satisfac tory and successful when carried into practice on a practical and commercial scale.

We have discovered a simple and completely 25 satisfactory solution of theoutstanding problem.

It is an object of the present invention to provide an antenna of the rod or tubular type which eliminates all of the disadvantages and inconveniences encountered in conventional antennae.

, It is another object of the present invention to provide an antenna of the rod or tubular type adapted to be mounted on restricted supporting surfaces of practically any desired character and having great mechanical strength and excellent electrical characteristics.

It is a further object of the invention to provide an antenna of novel and improved character having a universal mounting operatively associated therewith adapted to be mounted on windows, gabled roofs, chimneys, parapet walls, soil pipes, fences, trees, wash line posts, and on other regular and irregular surfaces.

Still another object of the invention is to provide an antenna of the rod or tubular type ineluding a universal mounting adapted to be readily and safely secured to any kind of supporting surface encountered in practice and which permits positive and continuous adjustment of the direction of the antenna into a position in which optimum conditions of wireless reception and freedom from noise are obtained.

It is also within the contemplation of the invention to provide a combination antenna and coupling system of a completely self-contained and unitary character which requires a minimum of effort and expense to install and to maintain.

The invention also contemplates a self-contained antenna unit of a universally adaptable and adjustable character which is simple in construction, small in size, efficient and foolproof in operation and which may be manufactured and sold on a practical and commercial scale at a relatively low cost.

Other and further objects and advantages of the invention will become apparent from the following description taken in conjunction with the accompanying drawings, in which Fig. 1 illustrates a perspective View, somewhat diagrammatic in character, of the antenna of the invention in one of its operative positions;

Fig. 2 depicts a front elevational view, somewhat fragmentary in character, of a preferred embodiment of the invention, drawn at approximately full scale;

Fig. 3 shows a side elevation of the embodiment shown in Fig. 2;

Fig. 4 is a longitudinal sectional view, also fragmentary, and having parts in elevation, of the embodiment of the invention shown in Figs. 2 and 3 Fig. 5 is a sectional view taken on line 55 of Fig. 4;

Fig. 6 illustrates a circuit diagram of the electrical circuits incorporated into the antenna shown in Figs. 2 to 5;

Fig. '7 depicts a side elevational View of a modified embodiment of the present invention;

Fig. 8 shows a plan view of the embodiment illustrated in Fig. 7; and

Fig. 9 is a vertical sectional view taken on line 9-9 of Fig. 7.

Broadly stated, according to the principles of the invention, a rod antenna is provided, preferably having a telescoping character and consti" tuted of a suitable metal, such as brass or aluminum. The lowermost extremity of this antenna is rigidly connected to a rotary joint having stationary means adapted to be mounted on a supporting surface and having fixing means associated therewith capable of fixing the antenna in any one of its adjusted positions.

We have found that a very simple and efficient rotary joint may be obtained by providing a body or base member of a cylindrical character. This body or base member may be constituted of a metal cylinder or of a cylinder constituted of porcelain, Bakelite or some other insulating material of great strength. One or more circular mounting brackets may encircle the circumferential surface of this cylinder and may be employed for securing such cylinder to any type of supporting surface. The cylindrical member may be retained in the circular bracket by the effect of friction alone or suitable grooves may be provided in said member conforming to the shape and to the width of the circular bracket. Due to the cylindrical character of the base member and of the conforming shape of the bracket or brackets holding the same, the base member may be rotationally displaced in the brackets and may be fixed in any one of its positions by means of a locking bolt or some other device adapted to compress the circular portion of the bracket. Thus, as it will be readily appreciated, in the strongly compressed position of the brackets, a brakeshoe-like action will be exerted on the cylindrical base member which will securely and positively retain the base m mber in its adjusted position. The lower extremity of the rod antenna is rigidly connected to the base member for example by providing a hole therein through which the lower end of the rod antenna may be inserted and fixed to a supporting member or screw. In case the base member is a hollow cylinder, or a substantially solid cylinder having suitable cavities therein, such inner space may be utilized for housing the various coupling coils or transformers in connection with condensers and other electrical elements necessary or desirable for further reducing noise and improving the conditions of reception. Likewise, terminals or binding posts may be provided in appropriate portions of the cylindrical base member from which a suitable transmission line may be run to the receiving set either directly, or through the intermediary of a set transformer, as it will be set forth more fully hereinafter.

The invention will now be described more fully to those skilled in the art in connection with the accompanying drawings.

Referring now more particularly to Figs. 2 to 5 of the drawings, a preferred embodiment of the invention is illustrated. Essentially, the novel rod antenna with universal mounting comprises a base member l of cylindrical character preferably constituted of a short piece of strong metal tubing. This base member is rotatably held by means of a pair of circular brackets 2 having an upper and substantially cylindrical portion encircling and closely conforming to the circumferential surface of the base member while the lower extremities 3 of said brackets are bent out flat and are provided with holes through which mounting screws 4 may be inserted to secure the brackets to any desired mounting surface. The portions of brackets 2 between the upper circular portion and the lowermost horizontal portions are bent to a substantially vertical direction with respect to the supporting surface and are denoted by reference character 5. A locking bolt 6 is passed through holes provided in this portion of the mounting brackets and is provided with a nut l at its end whereby the bracket may be strongly compressed thus exerting a powerful brakeshoe-like action on the cylindrical base member. The same effect may be obtained by providing a threaded hole in the vertical portion of the bracket which is engaged by locking bolt 6. Thus, it will be readily appreciated that in the loosened position of looking bolt 6, the cylindrical base member may be readily rotated with some friction in the brackets and may be easily adjusted into any desired position. After the proper adjustment has been obtained, such adjustment may be fixed and positively retained by tightening locking bolt 6.

The mounting of the antenna rod and of the various coupling coils to and within the cylindrical base member will be best understood from Figs. 4 and 5. For this purpose, we prefer to provide a plate of insulating character 8, constituted of Bakelite or some other insulating material having substantially the same length as the width of the cylindrical base member I, and being provided with threaded metallic extensions 9 at either end thereof secured thereto by riveting or in some other appropriate manner. These threaded metallic extensions are protruding through concentrical holes provided in the central portions of insulative disks l0 inserted at each end of metal cylinder or tubing l and secured by means of nuts I I whereby the inner space within tubing l is completely enclosed and the elements therein are protected from. the detrimental effects of the atmosphere. The lower end of a long screw I2 extends upwardly and downwardly from insulating plate 8. The lower end of screw I2 serves to secure coils I3 and iron core I4 while its upper extremity is adapted to engage a threaded female portion I5 in the lower extremity of rod antenna I6 50 that the antenna is rigidly connected, both electrically and mechanically, to screw I2. A hole H of suitable diameter is provided in the upper portion of metal cylinder I through which the antenna rod may be introduced into the cylinder. A sleeve I8 of an insulating material inserted between this hole I! and the lower end of rod antenna I6 has the object of insulating the antenna from the metal cylinder and at the same time to increase the rigidity of the resultant structure. Of course, the antenna proper may be of any desired character, such as of a solid rod type, or may be constituted of a plurality of sections of metal tubing which may be connected to each other in a telescoping manner so that the length of the antenna may be adjusted. A plurality of binding posts may be provided in one of insulating disks If), such as a pair of binding posts or terminals I9 for attacking a signal transmission line thereto and a binding post or terminal 20 for connecting a ground lead or counterpoise in the conventional manner. Of course, it is also possible to bring the leads out directly from the coils within the base member and to connect them to the transmission line and ground wire.

The connection of the antenna proper to this transmission line and ground may be accomplished in a great variety of ways with or without the inclusion of coupling devices or transformers as those skilled in the art of radio transmission and reception will readily understand. In most cases, however, it is preferred to provide a suitable coupling circuit or aerial transformer to further improve reception and to eliminate noise. A preferred coupling circuit is diagrammatically illustrated in 6 and comprises a pair of primary coils 2! and 22, of which coil 22 is connected across coil 2| by means of a small coupling condenser 23. One end of coil 2| is connected to antenna I6, while its other end is connected to binding post 20 and from this to a ground or counterpoise 24. The secondary system comprises secondary windings or coils 25 and 26 inductively coupled to primary coils or windings 2! and 22, respectively. Secondary coil 26 is connected across coil 25 through a small condenser 21, the ends of coil 25 being connected to transmission line binding posts I9 and from there through a transmission line 29, for example of the twisted pair type, to the receiver set. An iron core 28, preferably constituted of a powdered iron alloy of a character which is adaptableto high frequency operation, is provided to increase the coupling efficiency of the system. It is to be noted that coils 2i and 25 have a relatively large number of windings, while coils 22 and 26 have a very low number of windings so that the signals of broadcast frequency are primarily transmitted by coils or windings 2| and 25, while the signals of short wave frequency, including television signals, frequency modulated signals, and the like, are primarily transmitted by coils 22 and 2'5 having a considerably lower impedance at such frequencies. A twisted pair transmission line 29 may be connected to terminals I9 in conventional manner and connects to the corresponding'terminals of a radio or television receiving set either directly or through a suitable coupling device which may be of a character similar to the one illustrated in Fig. 6. In view 'of the fact that the coupling system shown in Fig. 6 is of conventional character and does not form part of the present invention, its operation will be readily understood without any detailed description. Although obviously various other types of coupling systems may be incorporated into our novel universally adjustable antenna, we prefer to employ a coupling system of the type disclosed, for example, in U. S. Patent No. He. 19,854.

From the foregoing description, operation of our novel adjustable antenna will be readily understood by those skilled in the art. Referring now more particularly to Fig. 1 of the drawings, reference character M denotes an inclined roof to which is secured by screws or nails 4 bracket or brackets 2 of cylindrical base member I. A transmission line 29 is connected to terminals I9 of the coupling device contained within base member I and is connected at its other end to a set transformer 32. containing a similar coupling system. Set transformer or coupler 32 is in turn connected to the aerial and ground terminals, A and G, of receiving set 33. Although it is not absolutely necessary, it is advisable to connect terminal 20 of the aerial transformer enclosed in base member I to a suitable ground connection or ccunterpoise by means of a lead 34, such connection being indicated by reference character 35 in Fig. l denoting an electrical connection to the gutter pipe. After these connections have been made. locking bolt 6 is slightly loosened to permit rotary displacement of base member or cylinder in the circular brackets 2 with some friction and the position of the base member is adjusted until the antenna rod proper arrives into its optimum position in which the received signal is the strongest and the reception of parasitic disturbances is the lowest. After this preferred direction of the antenna rod. has been ascertained, locking bolt ii is tightened whereby base member I and antenna rod I6 are locked and are securely held by the powerful brakeshoe-like action of the circular brackets 2. It will be readily appreciated that due to the universally adjustable character of the cylindrical base member, our novel antenna may be mountedv on a large variety of supporting surfaces including surfaces enclosing any angle with the horizontal. without requiring any special brackets or supports.

Figs. 7, 8 and. 9 illustrate a modification of base member I which has been found very satisfactory in practical operation and which may be readily manufactured at a low cost on a large scale. This modified embodiment comprises a cylindrical member M constituted of an insulating material of great strength and inexpensive character. such as, for example, porcelain.

Cylindrical member 4! is provided with a pair of circumferential grooves 42 having such dimensions as to conform to and to securely hold circular brackets of the type shown in Figs. 2 to 5. A pair of concentrical cylindrical cavities 43 and 44 are provided in base member 4| having their axis vertical to that of the base member. One of these cavities, 43, is of a relatively small diameter and has the object to accommodate the lower end of the antenna rod, while the lower one, 44, is of a considerably greater diameter and provides mounting space for the aerial transformer or coupling unit. Cavities 43 and 44 are communicating with each other through a constricted cylindrical space 45. The transformer or coupling unit proper is mounted on a circular disk 46 constituted of an insulating material, such as Bakelite or some other synthetic resin, having such dimensions as to conform to the shouldered portion 41 of cavity 44 provided in rectangular depression 44 of base member 4]. Disk 46 is retained in this position by means of a screw 48 extending through a hole provided in disk 45 and having its end protruding through cylindrical space or channel 45 and inserted into the threaded hole l in the lower extremity of antenna rod 26. An iron core 49 and coupling elements 55, of a character similar to the ones shown in Fig. 6 and in Figs. 4 and 5 are mounted around the intermediate portion of screw 48, electrical connections being made to transmission line binding posts 5| and ground binding post or terminal 52 provided in disk 46. It will be observed that screw 48 provides both the electribal and the mechanical connection of antenna rod in with the base member 4! and the electrical elements contained therein. In view of the similarity of construction, detailed description of the electrical connections and of the operation of this modified embodiment of the invention will not be necessary.

Although the present invention has been described in connection with a few preferred embodiments thereof, variations and modifications may be resorted to by those skilled in the art without departing from the principles of the present invention. Thus, instead of a straight, rod or tubular antenna, various other types or shapes of antennae may be applied with equal or similar results. More particularly, we have found that our novel, universally adjustable antenna and mounting is adaptable to T-shaped rod antennae in which the horizontal portion is constituted of two portions mechanically connected to but electrically insulated from each other by means of a suitable T-shaped insulative connecting member mounted on the top of the vertical rod. Insulated lead wires from these two horizontal portions of the antenna may be run to the aerial transformer contained in the base member through the inner space of the vertical antenna rod which in this case has to be of a tubular character. An antenna system of this type is especially advantageous for reception of extremely short waves, including television signals and frequency modulated signals. Likewise, it is also possible to employ various other types of adjustable devices or joints between the antenna and the mounting bracket, such as ball joints, universal joints, etc. We consider all of these variations and modifications as within the true spirit and scope of the present invention as disclosed in the foregoing description and defined by the appended claims.

We claim:

1. An adjustable antenna unit of the rod type comprising in combination a cylindrical base member, rod-holding means associated with said base member adapted to receive and to hold an antenna rod with its axis at right angles to the axis of said base member, supporting means for rotatably securing said base member to a supporting surface to continuously adjust the position of said base member with respect to said supporting surface, and means for positively locking said base member in its adjusted position.

2. An adjustable antenna unit of the rod type comprising in combination a cylindrical base member, rod-holding means in said base member adapted to receive and to firmly hold the lower extremity of a rod-type antenna with its axis at right angles to the axis of said base member, supporting means surrounding the circumferential surface of said base member for rotatably securing said member to a supporting surface in a continuously adjustable position with respect to said supporting surface, and means for locking said base member against displacement with respect to said supporting means whereby said base member and the antenna rod connected thereto may be adjusted and fixed in a predetermined position.

3. An adjustable antenna unit of the rod type comprising in combination a cylindrical base member, rod-holding means in said base member adapted to receive and to hold one extremity of an antenna rod with its axis at right angles to the axis of said base member, at least one circular bracket surrounding the circumferential surface of said base member for rotatably holding said member with respect to a supporting surface in a position continuously adjustable around the axis of said member, and means for deforming said bracket to frictionally lock said base member and the antenna rod connected thereto in its adjusted position.

4. An adjustable antenna unit comprising in combination member adapted to receive and to hold one extremity of an antenna rod with its axis at right angles to the axis of said base member, a pair of brackets having an annular portion substantially surrounding the circumferential surface of said base member and having extensions adapted to be secured to a supporting surface, said base member capable of being adjusted in the annular portion of said brackets about its longitudinal axis, and means for compressing said annular portions to fix said base member in such adjusted position.

5. An adjustable antenna unit of the rod type comprising in combination a base member of generally cylindrical shape adapted to receive one extremity of an antenna rod and to insulatedly hold the same from the ground with its axis at right angles to the axis of said base member, a pair of brackets having an annular portion surrounding the circumferential surface of said base member and having extensions adapted to be secured to a supporting surface, said base member capable of being adjusted about its axis in the annular portion of said brackets, means for compressing said annular portions to fix said base member in such adjusted position, and ground and transmission line connections for said base member electrically associated to said antenna rod.

6. An adjustable antenna unit of the rod type comprising in combination a base member of generally cylindrical shape adapted to receive one extremity of an antenna rod and to insulatedly hold the same from the ground with its axis at right angles to the axis of said base member, a pair of brackets having an annular portion surrounding the circumferential surface of said base member and having extensions adapted to be secured to a supporting surface, said base member capable of being adjusted about its axis in the annular portion of said brackets, means for compressing said annular portions to fix said base member in such adjusted position, ground of the rod type a cylindrical base surface of said tube and having extensions adaptand transmission line connections associated with said base member, and coupling means within said base member electrically associated with said antenna rod, ground,,and transmission line connections.

7. An adjustable antenna unit of the rod type comprising in combination a metallic tubular element, means within said element to insulatedly hold one extremity of an antenna rod with its axis at right angles to the axis of said tubular element, at least one bracket having an annular portion surrounding the circumferential surface of said element and having extensions adapted to be connected to a supporting surface, said element capable of being adjusted about its axis within the annular portion of said bracket, and means for compressing said annular portion to fix said element and the antenna rod connected thereto in their adjusted position.

8. An adjustable antenna unit of the rod type comprising in combination a metal tube, means within said tube to insulatedly hold one extremity of an antenna rod with its axis at right angles to the axis of said tube, at least one bracket having an annular portion surrounding the circumferentia-l surface of said tube and having extensions adapted to be connected to a supporting surface, said tube capable of being adjusted about its axis within the annular portion of said bracket, means for compressing said annular portion to fix said element and the antenna rod connected thereto in their adjusted position, and coupling means within said tube to couple said antenna rod to a transmission line.

9. An adjustable antenna unit of the rod type comprising in combination a. metal tube having an opening in the circumferential surface thereof, a pair of circular plates closing the ends of said tube, a transverse plate mounted within said tube between said circular plates, a threaded member upwardly extending from said transverse plate and adapted to cooperate with the threaded end of an antenna rod extending into said tube through said opening and to securely hold said rod with its axis at right angles to the axis of said tube, binding posts for connection of a ground and of a transmission line in at least one of said circular plates, coupling means mounted on said transverse plate electrically associated with said antenna rod and with said binding posts, and at least one resilient bracket having an annular portion surrounding the circumferential surface of said tube and having extensions adapted to be connected to a supporting surface, said bracket being constructed and arranged to rotatably hold said tube and capable of being compressed to fix said tube in its adjusted position.

10. An adjustable antenna unit of the rod type comprising in combination a metal tube having an opening in the circumferential surface thereof, a pair of circular insulative plates closing the ends of said tube, a transverse insulative plate mounted between said circular plates, a threaded member upwardly and downwardly extending from said transverse plate adapted to cooperate with the threaded end of an antenna rod extending into said tube through said opening and to securely hold said rod, an insulating sleeve intermediate to said tube and said rod, terminals in one of said circular plates for connection of a ground and of a transmission line, coupling means mounted on said transverse plate electrically associated with said antenna rod and with said terminals, a pair of resilient brackets having an annular portion surrounding the circumferential ed to be connected to a supponting'surface, said brackets being constructed and arranged to rotatably hold said tube, and a locking bolt for each of said brackets to compress said brackets and to lock said tube in its adjusted position.

11. An adjustable antenna unit of the rod type comprising in combination a cylindrical base member constituted of an insulating material, a transverse hole in said member for the insertion of an antenna rod thereinto, means within said member for securely holding said inserted rod with its axis at right angles to the axis of said base member, and at least one annular bracket for mounting said member on a supporting surface and to rotatably and adjustably hold said member with respect to such surface.

12. An adjustable antenna unit of the rod type comprising in combination a cylindrical base member constituted of an insulating material, a transverse cavity extending throughout said member for the insertion of the extremity of a rod antenna at one end thereof and for the insertion of a threaded member at the other end thereof adapted to engage a corresponding threaded portion of said rod to securely hold the same with its axis at right angles to the axis of said base member, a pair of annular brackets surrounding the circumferential surface of said member and having extensions for mounting on a supporting surface, said brackets being adapted to rotatably and adjustably hold said member, and a locking bolt for each of said brackets to fix said member and the antenna rod connected thereto in its adjusted position.

13. An adjustable antenna unit of the rod type comprising in combination a cylindrical base member constituted of an insulating material, a transverse cavity extending throughout said member having an upper portion conforming to the extremity of an antenna rod and having a considerably larger lower portion, an insulative plate closing the outer end of said lower portion, a threaded member extending from said plate through said cavity and adapted to engage a corresponding threaded portion of an antenna rod inserted into the upper portion of said cavity to securely hold said rod, coupling means within the lower portion of said cavity electrically associated with said antenna, a pair of annular brackets surrounding the circumferential surface of said member and having extensions for mounting the same on a supporting surface, said brackets being adapted to rotatably and adjustably hold said member, and a locking bolt for each of said brackets to fix said member and the antenna rod connected thereto in its adjusted position.

14. An adjustable antenna. unit of the rod type comprising in combination a cylindrical base member constituted of an insulating material and having a pair of spaced circumferential grooves therein, a transverse cavity extending throughout said member between said'grooves and having an upper portion conforming to the extremity of an antenna rod and having a considerably larger shouldered lower portion, an insulative disk inserted into the shouldered part of said lower portion and bearing a. plurality of terminals, a screw extending from the center of said disk through said cavity and adapted to engage a corresponding threaded portion of an antenna rod inserted into the upper portion of said cavity to securely hold said rod, coupling means mounted on said disk and around said screw within the lower portion of said cavity electrically associated with said 6 2311x810 antenna and with said terminals, a pair of brackand a locking bolt in each of said brackets to ets having annular portions inserted into the circompress the annular portions thereof and to fix cumferential grooves of said base member and said member and the antenna rod connected having extensions for mounting the same on a thereto in its adjusted position.

5 supporting surface, said brackets being adapted ALFRED FENER. to rotatably and adjustably hold said member, JOHN ALESI.

Images