1. A negative pressure gauge with a multi-stage positioning means, comprising:
a body provided with an airflow passage; and
the multi-stage positioning means having:
a rotary piece pivotally connected to the body and provided with a plurality of positioning recesses and a plurality of venting troughs; and
a cover plate covering the rotary piece and fixedly connected to the body, the cover plate extending to form a positioning protrusion corresponding to the positioning recesses;
wherein when the rotary piece rotates with respect to the cover plate, the positioning recesses allow the positioning protrusion to be selectively positioned therein and control communication or obstruction between the venting troughs and the airflow passage.
2. The negative pressure gauge with a multi-stage positioning means according to claim 1, further comprising an auxiliary positioning means, the auxiliary positioning means comprising an elastic element, an abutting piece and a plurality of troughs formed on the rotary piece, the elastic element being accommodated in the body, the abutting piece being sandwiched between the rotary piece and the elastic element, the engagement between the abutting piece and the troughs being in synchronization with the engagement between the positioning protrusion and the positioning recesses.
3. The negative pressure gauge with a multi-stage positioning means according to claim 1, further comprising a display model fixed to the body, the display model being electrically connected to the multi-stage positioning means.
4. The negative pressure gauge with a multi-stage positioning means according to claim 3, further comprising a power-supplying unit fixed to the body, the power-supplying unit being electrically connected to the display model and the multi-stage positioning means.
5. The negative pressure gauge with a multi-stage positioning means according to claim 3, wherein the display model comprises a circuit board and a display panel electrically connected to the circuit board.
6. The negative pressure gauge with a multi-stage positioning means according to claim 5, wherein the circuit board has a sensor unit, the sensor unit is partially accommodated in the airflow passage for sensing the pressure value of gas flowing through the airflow passage.
7. The negative pressure gauge with a multi-stage positioning means according to claim 1, wherein the cover plate has an elastic piece, and the positioning protrusion extends from the elastic piece.
8. The negative pressure gauge with a multi-stage positioning means according to claim 1, wherein the body is further formed with an intake port and an exhaust port communicating with the airflow passage.
9. The negative pressure gauge with a multi-stage positioning means according to claim 1, further comprising a flow regulator inserted in the body and partially accommodated in the airflow passage for controlling the amount of gas flowing through the airflow passage.
10. The negative pressure gauge with a multi-stage positioning means according to claim 1, wherein the body is formed with a protruding post, the rotary piece is provided with a through-hole, and the protruding post is pivotally inserted into the through-hole.
11. The negative pressure gauge with a multi-stage positioning means according to claim 10, wherein the multi-stage positioning means comprises a fixing element, the protruding post is provided with a screw hole, the cover plate is provided with an unobstructed hole, the fixing element passes through the unobstructed hole and the through-hole to be fixed in the screw hole.
12. The negative pressure gauge with a multi-stage positioning means according to claim 1, wherein the rotary piece is formed with an operating rod.
13. The negative pressure gauge with a multi-stage positioning means according to claim 1, wherein the multi-stage positioning means comprises a gasket provided between the rotary piece and the body.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A housing with a housing opening at a front which is closed off by a frame assembled from frame legs, wherein the housing opening is closeable by a front plate, and wherein accessories, including at least one of handles, storage elements, support arms, pedestals, keyboards and the like are connectible with the frame legs of the frame, the housing comprising:
outsides of the frame legs (10) having continuous receiving grooves (13) open toward outsides (11) of the frame legs (10);
the receiving grooves (13) forming undercut receivers (14) for insertion of one of fastening blocks (15) and connecting blocks (23) formed on the accessories (20); and
the fastening blocks (15) and the connecting blocks (23) matched to cross sections of the receivers (14) of the receiving grooves (13).
2. A housing with a housing opening at a front which is closed off by a frame assembled from frame legs, wherein the housing opening is closeable by a front plate, and wherein accessories, including at least one of handles, storage elements, support arms, pedestals, keyboards and the like are connectible with the frame legs of the frame, the housing comprising:
outsides of the frame legs (10) having continuous receiving grooves (13) open toward and with longitudinally oriented threaded strips (18) formed on the outsides (11) of the frame legs (10);
fastening screws screwable into the receiving grooves (13) designed as threaded grooves at any desired location; and
with the fastening screws one of the accessories (20) and fastening elements for the attachment of accessories (20) connectible with the frame legs (10) of the frame.
3. The housing in accordance with claim 2, wherein the frame legs (10) are connected with each other via corner elements (60) open toward the outsides of the frame, the corner elements (60) are connectible with the adjacent frame legs (10) by fastening flanges in which receivers (14) of the receiving grooves (13) are continued, and the corner elements (60) are closeable by a cover element.
4. The housing in accordance with claim 3, wherein spaces in the receiving grooves (13) of the frame legs (10) which are not occupied by one of a fastening block (15) and a connecting block (13) are covered flush with the frame legs (10) by introduced cover elements (19).
5. The housing in accordance with claim 3, wherein the spaces in the receiving grooves (13) of the frame legs (10) not covered by one of the accessories (20) are covered flush with the frame legs (10) by introduced cover elements (19).
6. The housing in accordance with claim 5, wherein the accessories (20) are designed as a storage tray (70) connected with the lower horizontal frame leg (10) of the frame, and a fastening block (15) formed as a strip is formed on an exterior of the rear wall of the storage tray (70).
7. The housing in accordance with claim 6, wherein the storage tray (70) and the fastening block (15) designed as a fastening elbow are connected with each other by screw connections.
8. The housing in accordance with claim 7, wherein the accessories (20) have a frame including frame legs (10) with identical receiving grooves (13) receiving a keyboard (72), the housing and the frame are connected with the keyboard (72) via a joint (71), and the joint (71) is connected by two fastening blocks (15) with the facing frame legs (10) of the housing and the accessory.
9. The housing in accordance with claim 8, wherein the fastening blocks (15) designed as strips can be formed on the two joint elements of the joint (71).
10. The housing in accordance with claim 9, wherein the accessories (20) are embodied as a U-shaped handle element (73) with lateral legs that terminate in the fastening blocks (15).
11. The housing in accordance with claim 10, wherein the accessories (20) are designed as a horizontally oriented storage board (75) which, by a fastening elbow (74) having a fastening block (15), is connected with a receiving groove (13) of the vertical frame leg (10) of the frame.
12. The housing in accordance with claim 1, wherein the frame legs (10) are connected with each other via corner elements (60) open toward the outsides of the frame, the corner elements (60) are connectible with the adjacent frame legs (10) by fastening flanges in which receivers (14) of the receiving grooves (13) are continued, and the corner elements (60) are closeable by a cover element.
13. The housing in accordance with claim 1, wherein spaces in the receiving grooves (13) of the frame legs (10) which are not occupied by one of a fastening block (15) and a connecting block (13) are covered flush with the frame legs (10) by introduced cover elements (19).
14. The housing in accordance with claim 1, wherein spaces in the receiving grooves (13) of the frame legs (10) not covered by one of the accessories (20) are covered flush with the frame legs (10) by introduced cover elements (19).
15. The housing in accordance with claim 1, wherein the accessories (20) are designed as a storage tray (70) connected with the lower horizontal frame leg (10) of the frame, and a fastening block (15) formed as a strip is formed on an exterior of the rear wall of the storage tray (70).
16. The housing in accordance with claim 15, wherein the storage tray (70) and the fastening block (15) designed as a fastening elbow are connected with each other by screw connections.
17. The housing in accordance with claim 1, wherein the accessories (20) have a frame including frame legs (10) with identical receiving grooves (13) receiving a keyboard (72), the housing and the frame are connected with the keyboard (72) via a joint (71), and the joint (71) is connected by two fastening blocks (15) with the facing frame legs (10) of the housing and the accessory.
18. The housing in accordance with claim 17, wherein the fastening blocks (15) designed as strips can be formed on the two joint elements of the joint (71).
19. The housing in accordance with claim 1, wherein the accessories (20) are embodied as a U-shaped handle element (73) with lateral legs that terminate in the fastening blocks (15).
20. The housing in accordance with claim 1, wherein the accessories (20) are designed as a horizontally oriented storage board (75) which, by a fastening elbow (74) having a fastening block (15), is connected with a receiving groove (13) of the vertical frame leg (10) of the frame.