US3732965A

US3732965A - Telegraph transceiver with retractable keyboard

Info

Publication number: US3732965A
Application number: US00121843A
Authority: US
Inventors: P Mero
Original assignee: Extel Corp
Current assignee: Extel Corp
Priority date: 1971-03-08
Filing date: 1971-03-08
Publication date: 1973-05-15
Anticipated expiration: 1990-05-15

Abstract

A compact, high-speed portable telegraph transceiver having an electrical keyboard movable between an extended operating position projecting outwardly of the front of the base of the telegraph transceiver and tilted at an angle relative to the base, and a retracted storage position in which the keyboard is completely enclosed within the transceiver base and protected against unauthorized use or possible damage.

Description

United States Patent 1191 Mero 14 1 May 15, 1973 54] TELEGRAPH TRANSCEIVER WITH 2,540,296 2 1951 Schwend et a1 ..197/186 R x RETRACTABLE KEYBOARD 1,355,818 10/1920 Clamecy.. ..197/186 A 1,267,356 51918 B .197 186A X lnvemori Peter Mm, Wmneika, 1,279,044 91913 "lfih ker 197/186 A 1,278,872 9/1918 Clamccy.... ....197/186 A [73] Ass'gnee corporat'on 2,977,413 3/1961 Howard ..l78/l7 c [22] Filed: Mar. 8, 1971 3,255,312 6/1966 Howard .1178/17 B [21] Appl' 121343 Primary Examiner-Ernest T. Wright, Jr.

A ttomey- Kinzer and Dom [52] U.S.Cl. ..197/l86 A, 197/98 V r 51 Int. (:1. ..A41j29/02 ABSTRACT [58] 'ffifiz gf'ij 'yi'a'i'" 5 3 5 A compact, high-speed portable telegraph transceiver D having an electrical keyboard movable between an ex- 17 E tended operating position projecting outwardly of the front of the base of the telegraph transceiver and tilted [56] References cued at an angle relative to the base, and a retracted UNITED STATES PATENTS storage position in which the keyboard is completely enclosed within the transceiver base and protected 2,929,872 3/1960 Howard 178/17 R against unauthorized use or possible damage 1,252,890 1/1918 Ebelhare et al ..197/186R 2 Claims, 10 Drawing Figures PATENTED WW 1 I975 SHEET 3 BF 3 m am 4 n. P W

r O w y 2 nM n 4 e M r vs 0 m6 m an O r m 4... tm A 2 E 9. RS i K 3 Q M l A M5114 s MN mm m Rw Mu vu Sc B P Nm C 0 MC m. o P6 T R 0 u w w m m M w T 4 s N H mr 7 2 TELEGRAPH TRANSCEIVER WITH RETRACTABLE KEYBOARD BACKGROUND OF THE INVENTION There are numerous applications in which a compact and relatively portable telegraph transceiver can be employed to advantage. In underdeveloped areas, a transceiver of this kind can be utilized as a local telegraph station under circumstances which may require changing the location of the telegraph station at regular or irregular intervals. In major construction projects, including road building and the construction of rail lines, a compact portable telegraph transceiver can afford a means for maintaining continuous written communication with a moving job site. Another application comprises local user stations, such as the offices of commercial and industrial organizations that require substantial telegraph service, with incoming messages predominating, but may be poorly set up for messenger access. In the latter, compact apparatus is highly important, and may permit multiple station installations impractical with conventional size equipment.

In many such applications for telegraph transceiver equipment, it may be necessary or desirable to change the immediate location of the telegraph equipment on relatively short notice, so that portable equipment can be quite advantageous. In virtually all such applications, the telegraph apparatus may be left unattended for substantial periods of time. When no operator is present, with conventional telegraph apparatus there is a substantial possibility that unauthorized personnel may attempt to operate the telegraph equipment or to experiment with it. The danger is increased if children or individuals unfamiliar with mechanical and electrical devices frequent the location of the telegraph equipment. Such persons may actuate the telegraph equipment in a manner that interferes with regular communications and may violate government regulations, furthermore, vulnerable parts of the telegraph apparatus, particularly the keyboard, may be damaged.

SUMMARY OF THE INVENTION Accordingly, it is a principal object of the present invention to provide a new and improved high-speed telegraph transceiver that is readily protected against unauthorized use and against possible damage to the keyboard that could result from such use.

A specific object of the invention is to provide a new and improved compact high-speed portable telegraph transceiver in which the keyboard is fully retractable into the base of the transceiver to protect the transceiver against unauthorized operation and potential damage.

A specific object of the invention is to provide a new and improved compact high-speed telegraph transceiver with a fully retractable keyboard in which, when the keyboard is extended for operational use, the keyboard is tilted to a desired angle to facilitate its use.

A specific object of the invention is to provide a new and improved compact high-speed portable telegraph transceiver, having a retractable keyboard, that is relatively inexpensive in construction yet convenient and effective in operation.

Accordingly, the invention relates to a compact highspeed portable telegraph transceiver; the transceiver comprises a hollow base with a high-speed telegraph printing mechanism mounted on the base and with receiving circuit means for actuating the printing mechanism in response to a received electrical telegraph code signal, the receiving circuit means also being mounted on the base. The transceiver further comprises transmission circuit means for generating a telegraph code signal in response to electrical character and function signals supplied thereto from an electrical keyboard. An electrical keyboard is included in the transceiver and is electrically connected to the transmission circuit means. Keyboard mounting means are provided for mounting the keyboard on the base for movement between a retracted storage position, in which the keyboard is enclosed within the base, and an extended operating position, in which the keyboard projects outwardly of the front of the base sufficiently to afford full access to the keys of the keyboard. The keyboard mounting means comprises a keyboard support frame including a pair of support rails of generally C-shaped cross-sectional configuration, and two sets of rollers, one set mounted in each side of the base and each set of rollers encompassed by one of the support rails. The keyboard is mounted upon the keyboard support frame with one of the leading and trailing edges of the keyboard pivotally mounted on the aforesaid rails. Means, mounted on the support frame, are provided for supporting the other edge of the keyboard at an angle relative to the rails, when the keyboard is in its extended operating condition, with the trailing edge of the keyboard elevated a predetermined distance above its leading edge. Releasable latch means are provided for latching the keyboard in each of its. storage and operating positions.

BRIEFDESCRIPTION OF THE DRAWING FIG. 1 is a perspective view of a high-speed portable telegraph transceiver constructed in accordance with one embodiment of the present invention, showing the keyboard in an extended operating position;

FIG. 2 is a front perspective view of the telegraph transceiver, with the keyboard in a retracted storage position; I

FIG. 3 is a plan view of the base of the telegraph transceiver, with the printing mechanism and cover for the base removed and with the keyboard in the retracted storage position;

FIG. 4 is a sectional elevation view of the base of the telegraph transceiver, taken approximately along line 4-4 in FIG. 3;

FIG. 5 is a detail sectional view, taken approximately along line 55 in FIG. 4;

FIG 6 is sectional elevation view corresponding to FIG. 4 but with the keyboard in the extended operating position;

FIG. 7 is a detail view, similar to FIG. 6, with an additional part of the keyboard support cut away;

FIG. 8 is a detail sectional view of a latch employed to maintain the keyboard in an inclined alignment, taken approximately along line 8-8 in FIG. 6;

FIG. 9 is a detail bottom view of the keyboard in the retracted storage position; and

FIG. 10 is a simplified block diagram of the electrical components of the telegraph transceiver.

DESCRIPTION OF THE PREFERRED EMBODIMENT FIGS. 1 and 2 afford external views of a compact high-speed portable telegraph transceiver 20 constructed in accordance with a preferred embodiment of the present invention. Transceiver comprises a hollow base 21 that includes a bottom plate 22, left and

right side walls

23 and 24, a rear wall (not shown), and a cover 25. The cover 25 is of inverted U-shaped configuration and fits over

side walls

23 and 24. The upper portion of the base cover 25 affords a platform upon which a high-speed telegraph printing mechanism 26 is mounted.

The telegraph printing mechanism 26 preferably comprises a dot matrix printing mechanism of the kind described and claimed inthe co-pending application of Walter J. Zenner and Raymond E. Kranz, Ser. No. 71,051, filed Sept. 10, 1970, now 11.8. Pat. No. 3,670,861 issued June 20, 1972, and including a printing head as disclosed and claimed in the co-pending ap plication of WJ. Zenner and R. E. Kranz Ser. No. 85,675 filed Oct. 30, 1970. Details of the printing mechanism have not been illustrated in the drawing because they are not critical to the present invention. Other forms of printing apparatus can be utilized as desired. However, the dot matrix printer is particularly advantageous because it is inherently small in size and light in weight, yet efficient in operation and capable of sustained, efficient operation in a rugged environment.

A roll of paper 28 is mounted on the rear portion of base 21, on cover 25, behind printing mechanism 26. The paper web 29 extends from roll 28 into printing mechanism 26, through an opening 31 in the top cover for the printing mechanism 26, and around a platen (not shown). The paper web 29 projects outwardly of the top of printing mechanism 26 after having received an imprint in printing mechanism 26. The paper web 29 may be advanced across the platen by actuation of a knob 32 that is connected to the roller platen of the printing mechanism 26; during normal operation, line feed advancement of the paper web 29 is effected by a suitable line feed mechanism incorporated in the printing mechanism 26.

Transceiver 20 further comprises an electrical keyboard 33 including the usual complement of keys 34 and a space bar 35 mounted upon a keyboard support plate 36 (FIG. 1). A front keyboard frame member 37 projects downwardly from the front of the keyboard support plate 36 and protects the lower portions of the keyboard 33.

Transceiver 20 further comprises keyboard mounting means for mounting keyboard 33 on base 21 for movement between a retracted storage position, shown in FIG. 2, in which the keyboard 33 is completely enclosed within base 21, and an extended operating position, shown in FIG. 1, in which keyboard 33 projects outwardly of the front of base 21 sufficiently to afford full access to the keys 34 of the keyboard 33. The mounting means for keyboard 33 are described more fully hereafter in connection with FIGS. 3 through 9. When keyboard 33 is in its retracted storage position, the front of base 21 is preferably closed by a closure member or door 38 mounted on the leading edge of the bottom wall 22 of base 21 by appropriate means such as a pair of hinges 39. A lock (not shown) may be provided for door 38 if desired.

The basic electrical and operational components of transceiver 20 are shown in block diagram form in FIG. 10. As shown in FIG. 10, keyboard 33 is electrically connected to the transmission circuits 41. Transmission circuits 41 comprise suitable encoding circuits and a distributor for generating a telegraph code signal in response to electrical character and function signals supplied thereto from keyboard 33 upon actuation of keys 34. Preferably, the transmission circuits 41 are mounted in the rear portion of the transceiver base 21, behind keyboard 33 (see FIG. 1). The transmission circuits 41 are coupled, by an appropriate transmission line or other communication link 50, to a remote station 42, and thus afford a means for sending a telegraph message to station 42.

Transceiver 20 further comprises receiving circuit means, shown as receiving circuits 43 (FIG. 10) for actuating the printing mechanism 26 in response to a received electrical telegraph code signal. In this instance, the received signal originates at remote station 42 and is transmitted to transceiver 20 over link 50. Transceiver 20 is connected to an external power supply 44. The power supply 44 is connected to printer 26 and to receiving circuits 43 through ganged switches 45A and 4513. The power supply 44 is also connected to keyboard 33 and transmission circuits 41 through a switch 47. Switch 47 may be controlled by the position of keyboard 33, as described hereinafter.

The basic operation of transceiver 2.0 can readily be understood from FIGS. 1, 2 and 10. When transceiver 20 is functioning as a receiver, keyboard 33 may be located in its retracted storage position within base 21 as shown in FIG. 2. Any telegraph signal received from remote station 42 (FIG. 10) is supplied to receiving circuits 43, which actuate printing mechanism 26 to reproduce the telegraph message on paper web 29 (FIG. 2). Operation can continue indefinitely, with all received messages being printed without requiring the attendance of an operator, as long as the power supply switches 45A and 458 (FIG. 10) are closed. Thus, if the operator finds it necessary to leave transceiver 20 for an extended period of time, or if there is no regular assigned operator, as in circumstances where transmission is on a limited and irregular basis, transceiver 20 serves as an effective receiver without requiring attendance to its operation. Individual messages reproduced on the paper web 29 c can be torn off and passed on to interested parties, with no special skill required.

During any period in which transceiver 20 functions as a remote unattended receiver, as described above, keyboard 33 can be left in its retracted storage position, masked from view by the door 38 on base 21. Unskilled and unauthorized personnel have no particular temptation to use the transceiver 20 for transmission of messages, since the keyboard 33 is not accessible and is well concealed. Thus, interference with operation of the telegraph system or potential damage to keyboard 33 are effectively eliminated. If considered necessary, the door 38 of base 21 can be provided with a lock to afford positive protection against unauthorized access to the keyboard 33.

When it becomes necessary or desirable to send a message from transceiver 20 to remote station 42 (FIG. 10), keyboard 33 is withdrawn from base 21 to its extended operating position as shown in FIG. 1. Transceiver 20 is provided with latch means, described more fully hereinafter, for releasably locking the keyboard 33 in the extended position. With the keyboard 33 extended, the transceiver 20 is ready for actuation of transmission circuits 41 to send a telegraph message to a remote station such as station 42 (FIG. 10). Preferably, the transceiver 20 is provided with an interlock to actuate power switch 47 to closed condition and energize keyboard 33 and transmission circuits 41 whenever keyboard 33 is in its extended operating position (FIG. 1). The same interlock operates to open switch 47 (FIG. when the keyboard 33 is returned to its retracted storage position, giving further assurance against accidental operation of the keyboard 33.

The keyboard mounting means for keyboard 33 can now be considered in detail. The mounting means for the keyboard 33, and the releasable latch means used to latch the keyboard 33 in its storage and operating positions, are shown in FIGS. 3 through 9.

As shown in FIGS. 3 and 4, a pair of rollers 51 are mounted upon shafts 52, the shafts 52 projecting inwardly as cantilever shafts from the side wall 23 of base 21. Rollers 51 are engaged by an elongated C-shaped support rail 53. A mounting block 54 is affixed to the forward end of support rail 53, as shown in FIGS. 3, 4, 5 and 9.

At the opposite side of base 21, a pair of rollers 55 are mounted on suitable shafts projecting inwardly of base 21 from side wall 24 directly opposite rollers 51. Rollers 55 are engaged by an elongated C-shaped keyboard support rail 56. At the forward end of rail 56, a mounting block 57 is affixed to the rail 56. A bar 58 is mounted between support rails 53 and 56, behind mounting

blocks

54 and 57. At the center of bar 58, a latch lug 59 is mounted on the bar 58 (FIGS. 3 and 4). The latch lug 69 engages in a toggle latch mechanism 61.

Latch mechanism 61 is a spring actuated device of known construction and may, for example, conform to the construction shown in U.S. Pat. No. 2,637,576. When lug 59 is inserted into latch mechanism 61, moving from right to left opposite arrow A, as seen in FIGS. 3 and 4, the lug 59 is engaged by latch mechanism 61 and is firmly locked in position against any attempt to move the lug 59 in the direction of arrow A. To trip latch mechanism 61, lug 59 is again moved from right to left through a short distance; this releases the latch mechanism 61 and permits free movement of lug 59 and of the bar 58 and rails 53 and 56 to which it is connected, to the right in the direction of the arrow A.

Keyboard 33 includes a lower framework upon which the keyboard support plate 36 is mounted. This lower frame for the keyboard 33 comprises the front frame member 37 and a corresponding rear frame member 63;

frame members

37 and 63 are C-shaped channel members as best shown in FIG. 7. A side frame member 64 extends between

frame members

37 and 63 at the left-hand side of keyboard 33, adjacent mounting block 54. A similar side frame member 65 extends between

frame members

37 and 63 at the other side of the keyboard 33, adjacent mounting block 57. The keyboard support plate 36 is affixed to frame

members

64 and 65 by appropriate means such as the screws 66. Thus,

frame members

37, 63, 64 and 65 afford a rigid rectangular framework underneath the support plate 36 of the keyboard 33.

The front end of the keyboard side frame member 64 is pivotally mounted upon mounting block 54 by means of a pivot pin 67, as shown in FIGS. 5, 6 and 7. A similar pivot connection is provided between the front end of keyboard frame member 65 and mounting block 57. Keyboard support plate 36 extends over the two mounting

blocks

54 and 57, and is normally aligned flush with the tops of the two mounting

blocks

54, 57

when keyboard 33 is in its retracted storage position (FIGS. 4 and 5). When the keyboard 33 is extended to its operating position, as shown in FIGS. 6 and 7, the rear edge of the keyboard 33 is tilted upwardly, pivoting about pin 67 and a corresponding pivot pin on the opposite side of the transceiver 20. Thus, when moved to its extended position, keyboard 33 can be inclined at an appropriate and convenient angle for manual actuation of keys 34 and space bar 35.

There is a latching mechanism to maintain keyboard 33 in the desired inclined alignment for manual operation when the keyboard 33 is in its extended operating position. This latching mechanism comprises two latches located at opposite sides of the keyboard 33; one of the latches is shown in detail in FIG. 8. As shown in FIG. 8, there is a recess 71 formed in the keyboard side frame member 64, near its inner end. A small latching plunger 72 is mounted in recess 71 and is urged outwardly thereof by a compression spring 73. Plunger 72 is aligned with a recess 74 in mounting block 54, in which an actuator plunger 75 is mounted. A corresponding construction is used at the opposite side of the keyboard 33.

When keyboard 33 is pivoted to the inclined alignment shown in FIGS. 6 and 7, the two small latching plungers 72, urged outwardly by the springs 73, engage in the recesses 74 and lock the keyboard 33 at the desired inclination for effective and convenient manual operation. When it is desired to return the keyboard 33 to its storage position, the two actuator plungers 75 are depressed, driving the locking plungers 72 out of the recesses 74 and allowing the keyboard 33 to return to its normal horizontal alignment, level with the tops of the mounting blocks 54 and 57.

For effective operation, it is also desirable to afford a positive latch to maintain keyboard 33 in its extended operating position. The latching mechanism utilized for this purpose comprises a pair of latching levers 81 and 82 (FIG. 3). As shown in FIG. 4, the inner end of lever 81 is pivotally mounted on a bracket 83 that is affixed to support rail 53. The outer end of lever 81 is biased upwardly by a spring 84. The upper surface of lever 81, at its outer end, forms a slot 85 with an inclined cam surface 86 located ahead of the slot 85. Lever 82 is similar in construction, being pivotally mounted at its inner end on a bracket 87 affixed to support rail 56. The leading end of lever 82 includes a slot 88 preceded by a cam surface 89, as shown in FIG. 7.

To extend keyboard 33 to its operating position, starting from the retracted storage position shown in FIG. 4, the door 38 is opened to the position 38A and the keyboard 33 is first moved a short distance in a direction opposite to arrow A to release latch mechanism 61. The spring action of latch mechanism 61 starts the keyboard 33 moving in the direction of arrow A, with

support rails

53 and 56 rolling along

rollers

52 and 55. I

If the spring impetus is insufficient, the operator can pull on the keyboard 33 to complete the movement of the keyboard 33 to the extended position shown in FIGS. 6 and 7.

As the keyboard 33 moves outwardly of base 21 in the direction of arrow A, the cam surfaces 86 and 89 on latching

levers

81 and 82 engage two latch pins 91 and 92 mounted on

side walls

23 and 24 of base 21 as shown in FIG. 3. When the two latch pins 91 and 92 engage the

cam surface

86 and 89,. respectively on the latch levers 81 and 82, the latch levers 81 and 82 are depressed until the

pins

91 and 92 come into alignment with the

latch lever slots

85 and 88. When this alignment is reached, the latch levers 81 and 82 are driven upwardly by their springs 84, reaching the alignment shown in FIGS. 6 and 7 with the latch pins 91 and 92 maintaining keyboard 33 in the desired extended position. Once this position is reached, the operator is able to pivot keyboard 33 to the desired inclined operating position, in which it is latched as described above.

When keyboard 33 is to be returned to its retracted storage condition, the first step is to depress the elevation latch actuator plungers 75 (FIG. 8), releasing keyboard 33 to return to horizontal alignment with

support rails

53 and 56. The operator then depresses the front ends of the latching levers 81 and 82 which are readily accessible (FIG. 1 This moves the latch levers 81 and 82 free of

pins

91 and 92. The operator pushes the keyboard 33 in a direction opposite to arrow A (FIGS. 3 and 4) back to its retracted storage position. As the keyboard 33 moves inwardly, with its support rails 53 and 56 moving along

rollers

51 and 55,'the latch lug 59 is brought into engagement with latching mechanism 61. At the same time an interlock switch 47 mounted in base 21 is engaged by bar 58, opening the power supply connection to keyboard 33 and to the transmission 2 circuits 41 of transceiver 20 (FIGS. 3 and Latch mechanism 61 engages lug 59 and holds the keyboard 33 in the desired storage position. The front cover 38 of base 21 can then be closed and the transceiver is back in the storage condition illustrated in FIG. 2.

I claim:

1. In a compact, high-speed portable telegraph transceiver comprising a hollow base, a high-speed telegraph printing mechanism, mounted on said base, receiving circuit means for actuating said printing mechanism in response to a received electrical telegraph code signal, mounted on said base,- transmission circuit means for generating a telegraph code signal in response to electrical character and function signals supplied thereto from an electrical keyboard, mounted on said base; and an electrical keyboard, having a plurality of keys electrically connected to said transmission circuit means, the improvement comprising:

keyboard mounting means for mounting said key board on said base for movement between a retracted storage position in which said keyboard is enclosed within said base and an extended operating position in which said keyboard projects outwardly of the front of said base sufficiently to afford full access to the keys of said keyboard; said keyboard mounting means comprising a keyboard support frame including a pair of support rails of generally C-shaped cross-sectional configuration and two sets of rollers, one set mounted in each side of said base and each set of rollers encompassed by one of said support rails; said keyboard being mounted upon said keyboard support frame with one of the leading and trailing edges of said keyboard pivotally mounted on said rails; means, mounted on said support frame, for supporting the other edge of said keyboard at an angle relative to said rails, when said keyboard is in its extended operating condition, with the trailing edge of said keyboard elevated a predetermined distance above its leading edge; and releasable latch means for latching said keyboard in each of said storage and operating positions. 2. A compact, high-speed portable telegraph trans ceiver, according to claim 1, and further comprising I keyboard power means for supplying electrical power to said keyboard, and electrical interlock means for disconnecting said keyboard from said power means whenever said keyboard is in its retracted storage position.

Claims

1. In a compact, high-speed portable telegraph transceiver comprising a hollow base, a high-speed telegraph printing mechanism, mounted on said base, receiving circuit means for actuating said printing mechanism in response to a received electrical telegraph code signal, mounted on said base, transmission circuit means for generating a telegraph code signal in response to electrical character and function signals supplied thereto from an electrical keyboard, mounted on said base; and an electrical keyboard, having a plurality of keys electrically connected to said transmission circuit means, the improvement comprising: keyboard mounting means for mounting said keyboard on said base for movement between a retracted storage position in whicH said keyboard is enclosed within said base and an extended operating position in which said keyboard projects outwardly of the front of said base sufficiently to afford full access to the keys of said keyboard; said keyboard mounting means comprising a keyboard support frame including a pair of support rails of generally C-shaped crosssectional configuration and two sets of rollers, one set mounted in each side of said base and each set of rollers encompassed by one of said support rails; said keyboard being mounted upon said keyboard support frame with one of the leading and trailing edges of said keyboard pivotally mounted on said rails; means, mounted on said support frame, for supporting the other edge of said keyboard at an angle relative to said rails, when said keyboard is in its extended operating condition, with the trailing edge of said keyboard elevated a predetermined distance above its leading edge; and releasable latch means for latching said keyboard in each of said storage and operating positions.

2. A compact, high-speed portable telegraph transceiver, according to claim 1, and further comprising keyboard power means for supplying electrical power to said keyboard, and electrical interlock means for disconnecting said keyboard from said power means whenever said keyboard is in its retracted storage position.