US3013295A

US3013295A - Suction nozzle

Info

Publication number: US3013295A
Application number: US815844A
Authority: US
Inventors: Descarries Raymond
Original assignee: Electrolux AB
Current assignee: Electrolux AB
Priority date: 1959-05-26
Filing date: 1959-05-26
Publication date: 1961-12-19
Anticipated expiration: 1978-12-19

Description

Dec. 19, 1961 R. DESCARRIES 3,013,295

SUCTION NOZZLE Filed May 26. 1959 3 Sheets-Sheet 1 {Adam k; ATIU/PA/KK Dec 19, 1961 R. DESCARRIES 3,013,295

SUCTION NOZZLE Filed May 26. 1959 3 Sheets-Sheet 2 FIG. 5

INVENTOR.

Dec. 19, 1961 R. DESCARRIES 3,013,295

SUCTION NOZZLE Filed May 26, 1959 3 Sheets-Sheet 3 INVENTOR.

fZ/ A! Arron/0.

Patented Dec. 19, 1961 3,013,295 SUCTION NGZZLE Raymond Desearries, Montreal, Quebec, Canada, as-

signor to Aktiebolaget Eiectrolux, Stockholm, Sweden, a corporation of Sweden Filed May 26, 1959, er. No. 815,844 8 Claims. (Cl. 15-417) This invention relates to suction cleaner nozzles and particularly to multiple purpose nozzles suitable for cleaning surfaces of different characters.

Devices of this general type comprise a nozzle body having at least two working faces, one of which may, for example, be provided with a brush for engagement with a floor or like surface, and the other with smooth portions for engagement with rugs or the like, passage means being provided to lead air from each work face to a common outlet which communicates with the suction cleaner fan. Usually, the nozzle is attached to one end of a rigid tube or wand, the other end of which is connected to a length of flexible hose leading to the inlet of the fan chamber, and the nozzle is manipulated manually by means of the wand. Since each working face must be capable of being brought iutoposition for engagement with the surface being cleaned, the nozzle is mounted on the wand in adjustable fashion. Since it is desirable to have all of the air flowing to the suction cleaner fan pass via the working face which is in use, some form of adjustable valving must be employed.

An object of the present invention is to provide a suction cleaner nozzle of the type referred to so constructed that all of the required adjustments of the nozzle and its valve means can be accomplished in a very simple manner by manipulation of the tube or wand to which the nozzle is attached.

Another object is to devise a multiple purpose suction cleaner nozzle adapted to be rotatably attached to one end of a manipulating tube or wand and embodying valve means operable simply by application of a slight pressure to the tube or wand when the desired working face of the nozzle is in engagement with the surface to be cleaned.

A further object is to provide an improved, highly simplified valve arrangement for multiple purpose suction cleaner nozzles.

Yet another object is to provide a multiple purpose suction cleaner nozzle including oscillatory valve means comprising only a single movable part.

in order that the manner inwhich these and other objects are attained in accordance with the invention can be understood in detail, reference is had to the accompanying drawings, which form a part of this specification, and wherein:

FIG. 1 is a perspective view of a suction cleaner nozzle constructed in accordance with one embodiment of the invention;

FIG. 2 is a sectional view taken on line 22, FIG. 1, illustrating the parts in the same position as in FIG. 1;

FIG. 3 is a sectional view similar to FIG. 2, but illustrating the main nozzle body in inverted position as compared to FIG. 2;

FIG. 4 is a sectional view similar to FIG. '3 but showing certain elements of the device in a second position;

FIG. 5 is a sectional view taken on line 5-5, FIG. 2;

PEG. 6 is a plan View of one main nozzle body member of the device of FIG. 1, viewing that member as indicated by line 6-6, FIG. 2;

FIG. 7 is a plan view of the other main nozzle body member of the device of FIG. 1, viewing the member as indicated by line 77, FIG. 4;

FIG. 8 is an exploded perspective view of a spring detent employed in the device of FIG. 1, and 7 FIG. 9 is a perspective View of a combination movable valve member and nozzle outlet connector forming a part of the device of FIG. 1.

Referring now to the drawings in detail, and first to FIGS. 1, 2 and 5-9 thereof, it will be seen that the embodiment of the invention here illustrated comprises a nozzle body 1 formed by

mating members

2 and 3 which have flat faces 4 and 5, respectively, the members being secured together, as by screws 6, with faces 4 and 5 in contact.

Member 2 is elongated in a direction transverse to the intended path of travel of the nozzle in use and may thus be said to have a front face 2 and a rear face 2*. Opposite face 4, member 2 is provided with an elongated channel 7 extending in the long direction of the member and opening away from face 4, the bottom wall of the channel sloping inwardly to a centrally disposed opening 8 communicating with a rearwardly opening air passage 9. Rigid work surface-engaging elements 10, of conventional construction, constituting a work face, and suitable for operative engagement with a rug or the like during use of the nozzle, extend on each side of channel 7.

Member 3 is similar in plan to member 2 and is also provided, opposite its side 5, with a work face having a centrally disposed opening 12 communicating with a rearwardly opening air passage 13. Mounted at the work face of member 3 in any suitable fashion, as by being clamped in channels 11 and 14, are the usual brushes 15 to be employed when the nozzle is used in cleaning floors and like hard, smooth surfaces.

It will thus be seen that there are two separate and independent work faces disposed on opposite sides of the body of the nozzle, and that, when the

mating body members

2 and 3 are fitted together, there are provided two substantially L-shaped air passages, the arms 8 and 12 of which extend inwardly from the respective work faces, and the arms 9 and 13 of which terminate in rearwardly directed outlet openings. Side walls 16 of passage 9 are aligned with side walls 17 of passage 13. The two passages are separated by a plate on partition 18 dis-posed generally in the plane of mating faces 4 and 5, the front and side edges of the plate being disposed in suitable notches in

members

2 and 3, as indicated at 19 in FIG. 2, and being clamped between

members

2 and 3 to secure the plate in a position preventing communication between passages 9 and 13.

Forwardly of the

front walls

20 and 21, FIG. 2, of passages 9 and 13,

elongated grooves

22 and 23 are respectively provided in faces 4 and 5 of

members

2 and 3, these grooves extending parallel to

walls

20 and 21.

Grooves

22 and 23 are so located as to mate when

members

2 and 3 are secured together with faces 4 and 5 in contact. Hence, the grooves combine to provide an elongated-recess extending in the long direction of the nozzle body.

Adjacent each side wall 16 of passage 9, member 2 is provided with a slot 24 extending at right angles to the axis of groove 22, each slot 24 intersecting groove 22 and extending to a point forwardly thereof. As viewed from an end of the nozzle, slots 24 have the general shape of a right triangle.

Adjacent each side wall 17 of passage 13, member 3 is provided with a slot 25 extending at right angles to,

groove 23, each slot 25 intersecting groove 23 and extending to a point forwardly thereof. Viewed from an end of the nozzle, slots 25 also have the general form of a right triangle.

When

members

2 and 3 are secured together in the fashion shown in FIG. 1, each slot 24 registers with a slot 25. Each registered pair of

slots

24 and 25 thus provides a space disposed at one side of the air passages 9 and 13, which space communicates with the recess 3 defined by

grooves

22 and 23 and opens through the rear face of the nozzle body.

At its rear face 2", member 2 is provided with two pairs of upright rearwardly projecting webs 26, each pair of webs being spaced apart and so disposed as to define an extension of a different one of slots 24. Similarly, member 3 is provided at its rear face 3 with two pairs of upright rearwardly projecting webs 27, each pair being spaced apart and so located as to define an extension of a different one of slots 25. As illustrated in FIGS. 1 and 2, each web 26 combines with a web 27 to provide an arcuate edge 28 centered on the longitudinal axis of the recess defined by

grooves

22 and 23. At their upper ends, the webs 26 are joined by an edge portion 29, FIG. 1, on member 2. At their lower ends, webs 27 are joined by a similar edge portion 30, FIG. 2, on member 3. Transversely the rear edge 31 of plate 18 extends arcuately in the same direction as do edges 28, is in alignment with edges 23, and has the same radius of curvature as do edges 28. It will be noted that

edges

23, 29, 36 and 31 define two separate outlet openings, one for each of the passages 9 and 13. it can also be said that these edges combine to define a cylindrical surface the longitudinal axis of which is coincident with the longitudinal axis of the recess provided by

grooves

22 and 23.

The nozzle is connected to the usual manipulating tube or wand 32, FIG. 2, by means comprising an elbow 33 and a combination connector and movable valve member, indicated generally at 34-. Member 34 includes a short tubular portion 35 within which one end portion of elbow 33 is telescopically disposed and arranged for swiveling movement in any suitable conventional fashion. Member 34 also includes a hollow portion 36 of rectangular transverse cross-section and a pair of parallel, spaced supporting arms 37 projecting from the end of portion 36 opposite elbow 33. The side walls 38 of portion 36 diverge forwardly and outwardly and each arm 37 extends forwardly from a different side wall 38, as illustrated in FIG. 9. At its forward end, each arm 37 is provided with a transverse bearing opening, the two bearing openings being aligned transversely of the supporting arm, and a plain cylindrical rod or shaft 39 extends through the bearing openings. Rod 39 is dimensioned to be clamped within the recess provided by

grooves

22 and 23 when members 2- and 3 are secured together. Supporting arms 37 are of such thickness, and are spaced apart at such a distance, that, when rod 39 is clamped in the recess provided by

grooves

22 and 23, each arm 37 can pivot through a different one of the spaces afforded by aligned

slots

24 and 25.

Fortion 36 of the combined connector and movable valve member 33 has a forwardly facing air inlet opening defined by front edge 40 of top wall 41, edge 42 of bottom wall 43 and two end portions 44 located each at the forward end of one of the side walls 38. The edges defining the air inlet opening for portion 36 also define a plain cylindrical surface the longitudinal axis of which is coincident with the longitudinal axis of rod 39. it may thus e said that, while the edges defining the outlet openings of passages 9 and 13 define a convex cylindrical surface, the edges defining the inlet opening for portion 36 of the combined connector and movable valve member define a cylindrical surface which is concave and has the same radius of curvature as the cylindrical surface defined by the edges of the outlet openings of the air passages. Thus, when rod 39 is disposed in the recess provided by

grooves

22 and 23, the edges defining the inlet opening for the member 33 slidably engage

edges

23 and 31 and can be brought into flush engagement with edge portions 29 and 30.

As will be seen in FIG. 2, the height of the outlet opening for passages g and 13 equals the height of the inlet opening of member 34. Accordingly, if front edge 40 of top wall 41 of portion 36 engages edge portion 29 of member 2, front edge 42 of bottom wall 43 of portion 36 will engage edge 31 of plate 18. Portions 44 will, of course, engage edges 28 of webs 26. With the parts so positioned, the interior of portion 36, and hence the interior of the wand 32 connected to elbow 33, is in communication with passage 9 and, therefore, with the work face of member 2.

On the other hand, if edge 46 of top Wall 41 of portion 36 engages edge 31 of plate 18, front edge 42 of bottom wall 43 will engage edge portion 39 of member 3 and the wand 32 will be in communication with passage 13 and, therefore, with the work face of member 3.

At a point beside but spaced from one slot 24, a semi cylindrical recess 45 is provided in face 4 of member 2, recess 45 having its axis extending at right angles to such slot. Recess 45 communicates with the slot via an intermediate channel 46 of rectangular transverse cross-section. An identical recess 4-7 is similarly provided in face 5 of member 3, recess 47 communicating with the adjacent slot 25 via a channel 48 identical to channel 46.

Recesses

45 and 47 are so located as to register when

members

2 and 3 are assembled to form the nozzle body 1. Disposed to reciprocate in the space afforded by

recesses

45 and 47 and channels 46 and 48 is a rigid detent member 49, the top of which is normally biased into the junction of the

adjacent mating slots

24, 25 by a helical compression spring 50.

Detent member 4% has a body 51 of square transverse cross-section, body 51 being slidably disposed in the space defined by channels 46 and 48. The tapered tip 52 of the detent body is formed by two slanting surfaces 5?. each facing a different one of the

mating slots

24 and 25 into which the tip projects under the influence of spring 50. Opposite tip 52, the detent is provided with a circular flange 53 and a cylindrical extension 54, the latter being disposed within spring 50. As seen in FIG. 5, spring 50 has one end seated against an end of the space defined by

recesses

45 and 47, the other end of the spring being seated against flange 53. Hence, the spring is effective to bias flange 53 against the shoulder provided at the junctions of

recesses

45, 47 and channels 46, 48. When the detent member 49 is in this position, the tapered tip 52 thereof projects into the space defined by the adjacent pair of

slots

24, 25 and thus lies in the path of travel of the corresponding one of supporting arms 37.

Supporting arms 37 are each provided, on each edge, with a detent-camming surface 55 extending approximately radially of the axis of rod 39. Each detent member camming surface 55 has a portion disposed to lie in flush engagement with one of the faces 52 when the combined connector and movable valve member 34 occupies the appropriate one of its two extreme pivoted positions, in which position the member 34 registers with one or the other of passages 9 and 13. Thus, the detent tends to restrain member 34 in that valving position to which it has been pivoted. Movement of member 34 away from such position with sufiicient force is, however, effective to overcome the biasing action of spring 50 and force detent member 40 laterally of

adjacent slots

24 and 25 to an inactive position.

The nozzle construction represented by this embodiment of the invention can be assembled very simply by first inserting shaft 39 through the aligned bearing openings in supporting arms 37 of member 34, then disposing the shaft 39 in one of the

grooves

22 or 23, then placing plate 18 in its proper position, and then fitting the two

body members

2 and 3 together and securing them by means of screws 6.

The manner in which the nozzle is employed, and the simplicity of its operation during use, will be clear from FIGS. 2-4. In FIG. 2, the nozzle is shown with brushes 15 engaging a floor F, and with combination connector and movable valve member 34 disposed in registry with air passage 13, in which position member 34 is restrained by detent member 49. Elbow 33 is disposed with its free end portion extending upwardly at the angle at which the user maintains the manipulating tube or Wand 32.

Assuming now that the user wishes to employ the nozzle in cleaning a rug, for which purpose work-engaging elements are appropriate and brushes unsuitable, nozzle body 1 is turned over, so that work elements 10 engage the surface of rug R, elbow 33 turning in portion 35 of member 34 so that the proper angle of manipulating tube or wand 32 can be maintained. At this point, member 34 remains in communication with air passage 13 and therefore with the space between brushes 15. See FIG. 3. A slight downward pressure on the wand 32 is, however, effective to overcome the biasing action of detent spring 50, and such pressure therefore causes member 34 to pivot downwardly, about the axis of rod 39, until the inlet opening of portion 36 thereof registers with the outlet opening of air passage 9, placing the wand, and thus the suction cleaner fan, in communication with the proper work. face of the nozzle, as seen in FIG. 4. Hence, the suction cleaner is now effective to draw air from the rug R via channel 7, opening 8, air passage 9, portion 36 of member 34,- elbow 33, the wand 32 and the usual flexible hose, and the rug is cleaned in normal fashion.

When it is again desired to use the nozzle on a smooth,- hard surface, such as a floor, the nozzle is again ro-' tated half a turn about the axis of portion 35 of member 34, bringing brushes 15 to the position seen in FIG. 2, and slight pressure is again applied to the wand 32 to pivot member 34 from the position seen in FIG. 4 to the position seen in FIG. 2, so placing the suction cleaner fan in communication with the space between brushes l5.

Throughout this entire operation, it is unnecessary for the user to manipulate the nozzle directly, all of the movements just described being effected by manipulation of the wand 32 to which elbow 33 is attached.

Referring to FIGS. 2, 3 and 9, it will be noted that the arms 37 are each of such shape and size that, when portion 36 of the combination connector and valve member 34 registers with passage 9, one edge of each arm 37 engages the bottom of the corresponding slot in member 2. Similarly, when portion 36 registers with passage 13, the other edge of each arm 37 engages the bottom of the corresponding slot in member 3. Accordingly, when the combination connector and movable valve member 34 is in either of its two extreme pivoted positions, one arm 37 is held between detent member 49 and the bottom of the

corresponding slot

24, 25. Since detent-carnming surfaces are provided on each supporting arm, it is not necessary that, during assembly of the nozzle, a particular one of the supporting arms be disposed in particular ones of the slots.

While work-engaging elements it) have been illustrated as including an adjustable comb member of known construction, it is to be understood that such elements can take any form suitable for use in cleaning a particular type of surface, such as rug R. Similarly, the particular configuration and disposition of brushes 15 is not critical to the invention,

What is claimed is:

1. In a multi-purpose suction cleaner nozzle, the combination of a nozzle body having a pair of separate and independent, oppositelydisposied work faces and means defining a pair of substantially L-shaped air passages one arm of each communicating with a different one of said work faces, and the other arm ofeach terminating in an outlet opening, said outlet openings beingseparated but lying adjacent each other, and the edges of said outlet openings all defining an arcuate surface; a hollow connector adapted for connection to an air conducting conduit and having an air inlet opening, the edges of said inlet opening defining a curved surface identical with the curved surface defined by the edges of said outlet openings, one of said surfaces being concave and the other convex; and means mounting said connector on said nozzle body for pivotal movement about an axis located at the center of said arcuate surfaces, so that, as said connector is pivoted, said inlet opening is brought selectively into alignment with said outlet openings.

2. In a multi-purpose suction cleaner nozzle, the combination of two body members each having a work face and an opposite face, said opposite faces being adapted to mate with each other, each body member having an air passage communicating with the work face of such body member, said air passages having outlet openings which are adjacent when said mating opposite faces are engaged with each other, each of said body members being provided with a pair of open slots disposed one on each side of but separated from the air passage in such body memher; a hollow connector adapted for connection to an air conducting conduit and having an air inlet opening of such size and shape as to be registrable with either of said outlet openings to place the interior of said connector in communication with the air passage leading to such outlet opening; means securing said body members together with said mating opposite faces in contact and with said pairs of open slots registering with each other to provide a pair of spaces; and means pivotally mounting said connector on said body members for movement to bring said inlet opening selectively into registry with said outlet openings, said means comprising two supporting arms each extending through a different one of said pair of spaces. Y

3. In a multi-purpose suction cleaner nozzle, the combination of a body member having two work faces and two internal air passages each leading to a different one of said work faces and each having an outlet opening directed rearwardly of the body; a hollow connector adapted for connection to an air conducting conduit and having an inlet opening adapted to register with either of said outlet openings; and mounting means supporting said connector on said body for movement to bring said connector selectively into registration with said outlet openings, said body being provided with spaces located one at each side of out separated from said passages and opening through the rear of said body adjacent said outlet openings, said mountlng means including a pair of support members disposed each in one of said spaces, and said inlet opening being disposed between said support members.

4. Ina multi-purpose suction cleaner nozzle, the combination of two body members each having a work face and an opposite face, said opposite faces being adapted to mate with each other, each body member having an air passage communicating with the work face of such body member, said air passages having outlet openings which are adjacent when said mating opposite faces are engaged with each other, each of said body members being provided with a pair of open slots disposed one on each side of but separated from the air passage in such body member; a hollow connector adapted for connection to an air conducting conduit and having an air inlet opening of such size and shape as to be registrable with either of said outlet openings to place the interior of said .connector in communication with the air passage leading to such outlet opening; means securing said body members together with said mating opposite faces in contact and with said pairsof open slots registering with each other to provide a pair of spaces; and means pivotally mounting said connector on said body members for move ment to bring said inlet opening selectively into registry with said outletopenings, said means comprising ashaft clamped between the mating opposite faces of said body members at a point adjacent the front edge thereof, and a pair of supporting arms'rigid with said connector and journaled on said shaft, each of said arms extending through a different one of said pair of spaces.

5. In a multipurpose suction cleaner tool, a suction conduit connector having an air inlet opening, a suction conduit elbow, said connector being rotatable on said elbow about a first substantially horizontal axis and said elbow having an arm extending at an angle to said first axis in a generally upward direction whenever the tool is being used for cleaning surfaces like floors and rugs, for example, the tool comprising structure providing a pair of nozzles in back-to-back relation, each of said nozzles having a separate suction opening and a separate outlet, means pivotally mounting said connector on said nozzle structure for angular movement through an acute angle between two positions about a second substantially horizontal axis which is transverse to said first axis, each of the suction openings being movable to a downward facing cleaning position responsive to rotation of said connector about said first axis through an angle of 180 from the downward facing cleaning position of the other of said suction openings, and means embodied in said nozzle structure and said connector for bringing the outlet of one of said nozzles in communication with the inlet of said connector when the suction inlet of said one nozzle is in a downward facing cleaning position and said connector is moved to one of its two positions about said second axis, and for bringing the outlet of the other of said nozzles in communication with the inlet of said connector when the suction inlet of said other nozzle is in a downward facing cleaning position and said connector is moved to the other of its two positions about said second axis.

6. In a multi-purpose suction cleaner tool, a suction conduit connector having an air inlet opening, a suction conduit elbow, said connector being rotatable on said elbow about a first substantially horizontal axis and said elbow having an arm extending at an angle to said first axis in a generally upward direction whenever the tool is being used for cleaning surfaces like floors and rugs, for example, the tool comprising structure providing a pair of nozzles in back-to-back relation, each of said nozzles having a separate suction opening and a separate outlet, means pivotally mounting said connector on said nozzle structure for angular movement through an acute angle between two positions about a second substantially horizontal axis which is substantially perpendicular to said first axis, each of the suction openings being movable to a downward facing cleaning position responsive to rotation of said connector about said first axis through an angle of 180 from the downward facing cleaning position of the other of said suction openings, and means embodied in said nozzle structure and said connector for bringing the outlet of one of said nozzles in communication with the inlet of said connector when the suction inlet of said one nozzle is in a downward facing cleaning position and said connector is moved downward to one of its two positions about said second axis and for bringing the outlet of the other of said nozzles in communication with the inlet of said connector when the suction inlet of said other nozzle is in a downward facing cleaning position and said connector is moved downward to the other of its two positions about said second axis.

7. In a multi-purpose suction cleaner tool having front and rear walls, a suction conduit connector having an air inlet opening, a suction conduit elbow, said connector being rotatable on said elbow about a first substantially horizontal axis and said elbow having an arm extending at an angle to said first axis in a generally upward direction from the rear wall of the tool whenever the tool is being used for cleaning surfaces like floors and rugs, for example, the tool comprising structure providing a pair of nozzles in back-to-back relation, each of said nozzles having a separate suction opening and a separate outlet, means pivotally mounting said connector on said nozzle structure for angular movement through an acute angle between two positions about a second substantially horizontal axis which is nearer to the front wall than to the rear wall of the tool and substantially perpendicular to said first axis, each of the suction openings being movable to a downward facing cleaning position responsive to rotation of said connector about said first axis through an angle of from the downward facing cleaning position of the other of said suction openings, and means embodied in said nozzle structure and said connector for bringing the outlet of one of said nozzles in communication with the inlet of said connector when the suction inlet of said one nozzle is in a downward facing cleaning position and said connector is moved downward to one of its two positions about said second axis and for bringing the outlet of the other of said nozzles in communication with the inlet of said connector when the suction inlet of said other nozzle is in a downward facing cleaning position and said connector is moved downward to the other of its two positions about said second axis.

8. In a multi-purpose suction cleaner tool, a suction conduit connector having an air inlet opening, a suction conduit elbow, said connector being rotatable on said elbow about a first substantially horizontal axis and said elbow having an arm extending at an angle to said first axis in a generally upward direction whenever the tool is being used for cleaning surfaces like floors and rugs, for example, the tool comprising structure providing a pair of nozzles in back-to-back relation, each of said nozzles having a separate suction opening and a separate outlet, means pivotally mounting said connector on said nozzle structure for angular movement through an acute angle between two positions about a second substantially horizontal axis which is substantially perpendicular to said first axis, each of the suction openings being movable to a downward facing cleaning position responsive to rotation of said connector about said first axis through an angle of 180 from the downward facing cleaning position of the other of said suction openings, the separate outlets of said nozzles being adjacent to one another and separated by a wall of said nozzle structure, said outlets being of arcuate shape and having a radius of curvature about an axis substantially coinciding with said second axis, the air inlet opening of said connector being of armate shape and having a radius of curvature about an axis substantially coinciding with said second axis, and means embodied in said nozzle structure and said connector for bringing the outlet of one of said nozzles into registry with the inlet of said connector when the suction inlet of said one nozzle is in a downward facing cleaning position and said connector is angularly moved downward to one of its two positions about said second axis and for bringing the outlet of the other of said nozzles into registry with the inlet of said connector when the suction inlet of said other nozzle is in a downward facing cleaning position and said connector is angularly moved downward to the other of its two positions about said second axis.

References Cited in the file of this patent UNITED STATES PATENTS 2,212,942 Karlstrom Aug. 27, 1940 2,278,096 Ross Mar. 31, 1942 2,319,927 Hansson May 25, 1943 2,516,205 Hallock July 25, 1950 2,624,064 Snyder Jan. 6, 1953 2,632,914 .White Mar. 31, 1953 2,885,716 Brown May 12, 1959 2,885,717 Lampe May 12, 1959