US20010001233A1 - Low clearance alarm bumper - Google Patents
Low clearance alarm bumper Download PDFInfo
- Publication number
- US20010001233A1 US20010001233A1 US09/755,610 US75561001A US2001001233A1 US 20010001233 A1 US20010001233 A1 US 20010001233A1 US 75561001 A US75561001 A US 75561001A US 2001001233 A1 US2001001233 A1 US 2001001233A1
- Authority
- US
- United States
- Prior art keywords
- bumper
- set forth
- alarm
- switch
- alarm signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q9/00—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling
Definitions
- the present invention relates to the field of low clearance alarm devices. More particularly, the invention is concerned with an alert bumper that can be suspended adjacent a doorway and below the level of the header for activating an alarm upon being tilted in response to an impact, such as when a forklift carrying a tall load approaches the doorway.
- the present invention solves the prior art problems mentioned above and provides a distinct advance in the state of the art.
- the low clearance alert bumper hereof provides a warning in time to prevent impact with a low clearance structure.
- the preferred alarm bumper apparatus includes a bumper, a suspension assembly for suspending the bumper at a selected height and for allowing the bumper to shift upon impact, and an alarm circuit carried by the bumper and operable for sensing impact for activating an alarm.
- the bumper is in the nature of a tubular member such as a pipe suspended parallel to the support surface.
- the alarm circuit includes a tilt switch that activates upon tilting of the bumper upon impact. In response, the circuit produces an alarm signal delivered to a pair of lamps and a speaker for providing both visual and audible alarms. Such can alert the driver of a forklift, for example, in time to prevent impact with a low clearance structure such as a doorway header.
- Other preferred aspects of the present invention are disclosed herein.
- FIG. 1 is a pictorial view illustrating the preferred alarm bumper apparatus in accordance with the invention in use
- FIG. 2 is a partial, exploded, pictorial view of the apparatus of FIG. 1;
- FIG. 3 is a pictorial view of the preferred alarm housing and alarm circuit of the apparatus of FIG. 1 showing the housing cover positioned above the housing;
- FIG. 4 is a partial top plan view of the apparatus of FIG. 1 of another embodiment of the alarm circuit switch;
- FIG. 5 is an electrical diagram of the alarm circuit of the apparatus of FIG. 1.
- FIG. 6 is a left side elevational view of the apparatus of FIG. 1 shown in use in the tilted position by impact and with the static position shown in phantom lines.
- apparatus 10 broadly includes bumper 12 , suspension assembly 14 and alarm circuit 16 .
- Bumper 12 includes tubular body 18 , left end cap 20 and right end cap 22 .
- Body 18 is preferably in the nature of four inch PVC pipe about ten feet long although the diameter and length can be selected as needed for particular circumstances.
- End caps 20 , 22 are also in the nature of PVC pipe fittings. With this material, bumper 12 is light weight, economical and easy to work.
- Suspension assembly 14 includes left and right, eyelet fasteners 24 and 26 and left and right flexible cords 28 and 30 .
- Fasteners 24 , 26 are preferably in the nature of conventional eye bolts coupled with bumper 12 adjacent the respective ends thereof.
- Cords 28 , 30 are preferably made of chain with one end of each coupled respectively with fasteners 24 , 26 .
- alarm circuit 16 includes impact switch 32 , control circuit 34 , left lamp 36 , right lamp 38 and speaker 40 .
- Housing 42 encloses switch 32 , circuit 34 and speaker 40 under removable cover 44 .
- housing 42 is positioned in opening 46 defined in the upper surface of bumper 12 .
- housing 42 and the components thereof are positioned within bumper 12 for greater protection against potential impact and to improve the aesthetic appearance of bumper 12 .
- Impact switch 32 is preferably in the nature of a normally closed, tilt switch. That is, in the static position of bumper 12 as illustrated in FIG. 1 and by the phantom lines in FIG. 6, switch 32 is in the closed position. Upon the tilting of bumper 12 , indicative of impact, switch 32 is activated to open thereby indicating an alarm condition.
- switch 32 can include other types of switches such as those responsive to motion and impact.
- FIG. 4 illustrates another example in which switch 32 is in the nature of a photoelectric switch 48 positioned adjacent one end of bumper 12 and outboard thereof.
- Light emitter 50 such as a low power laser is positioned adjacent the opposed end of bumper 12 and outboard thereof and oriented to emit light beam 52 for impingement on switch 48 .
- Switch 48 is activated upon the breaking of beam 52 , such indicating that bumper 12 has experienced an impact.
- alarm circuit 16 can include more than one switch or more than one type of switch.
- Control circuit 34 is coupled with switch 32 and responsive to activation thereof for producing an alarm signal.
- This alarm signal is in the nature of a power signal to lamps 36 , 38 and speaker 40 in order to energize these components.
- lamps 36 , 38 are coupled with left and right end caps 20 , 22 respectively.
- lamps 36 , 38 include a standard amber globe and flash upon activation.
- Speaker 40 emits a loud, siren-like audible alarm in order to elicit an immediate response upon activation.
- FIGS. 1 and 6 illustrate apparatus 10 in use in a building such as a warehouse adjacent doorway 54 having header 56 .
- Cords 28 suspend bumper 12 with the long axis thereof parallel to floor 58 .
- Bumper 12 is preferably positioned with the lower edge thereof at the same height as the lower edge of header 56 or slightly below, and spaced horizontally about four feet from header 56 .
- the spacing of the lower edge of bumper 12 and the spacing from header 56 is a matter of choice depending upon particular circumstances.
- header 56 is merely an example of a low clearance area.
- FIG. 6 illustrates an environment of use for apparatus 10 in which load 60 being carried by forklift 62 is too tall to fit under header 56 .
- load 60 As load 60 approaches doorway 54 , it engages bumper 12 and shifts bumper 12 from the static position (phantom lines) to the tilted position.
- switch 48 When this occurs, switch 48 is activated and control circuit 34 responds by activating lamps 36 , 38 and speaker 40 .
- the lights and sound alert the driver of forklift 62 that impact with header 56 is imminent. That is, the driver is warned in sufficient time to stop forklift 62 to avoid a collision between load 60 and header 56 .
- alarm circuit 16 includes conventional 120VAC/12VDC power supply 64 having plug 66 for plugging into a convenient source of power in order to supply power at 12VDC to alarm circuit 16 including control circuit 34 .
- Switch 32 is normally closed with bumper 12 in the static position. With switch 32 closed, transistor Q 1 is off because base current by way of resistor R 1 (22K) is diverted to ground.
- Transistor Q 3 is on because of the base current supplied by way of resistor R 3 (22K). With Q 3 conducting, transistors Q 2 and Q 4 are off. As a result, lamps 36 , 38 and speaker 40 are off. Also, capacitor C 1 (470 uF) is charged through resistor R 2 (2.2K).
- switch 32 opens and base current is supplied to transistor Q 1 which begins conducting through resistor R 2 . When this occurs, capacitor C 1 begins to discharge through Q 1 . This reverse biases Q 3 which turns off.
- capacitor C 2 charges to the supply voltage level.
- Base current is supplied by way of resistor R 7 (15K) to transistor Q 2 and by way of resistor R 6 (22K) to transistor Q 4 . Operation of Q 4 activates lamps 36 , 38 and speaker 40 .
Landscapes
- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Mechanical Engineering (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Emergency Alarm Devices (AREA)
Abstract
A low clearance alarm bumper apparatus (10) includes a bumper (12) that can be suspended adjacent a doorway and below the level of the header for activating an alarm circuit (16) upon being tilted in response to an impact, such as when a forklift carrying a tall load approaches the doorway. Upon impact, the preferred bumper (12) activates a pair of lamps (36, 38) and a speaker (40) to produce an audible alarm to warn the forklift driver that the load is too tall to clear the doorway header.
Description
- 1. Not applicable.
- 2. Not applicable.
- 3. Not applicable.
- 4. 1. Field of the Invention
- 5. The present invention relates to the field of low clearance alarm devices. More particularly, the invention is concerned with an alert bumper that can be suspended adjacent a doorway and below the level of the header for activating an alarm upon being tilted in response to an impact, such as when a forklift carrying a tall load approaches the doorway.
- 6. 2. Description of the Prior Art
- 7. It is not an uncommon occurrence for the driver of a forklift carrying a tall load to misjudge a low clearance such as the header of a doorway and run into the header with the load. Such an accident can have serious consequences including injury to the driver and damage to the load, header and forklift.
- 8. The present invention solves the prior art problems mentioned above and provides a distinct advance in the state of the art. In particular, the low clearance alert bumper hereof provides a warning in time to prevent impact with a low clearance structure.
- 9. The preferred alarm bumper apparatus includes a bumper, a suspension assembly for suspending the bumper at a selected height and for allowing the bumper to shift upon impact, and an alarm circuit carried by the bumper and operable for sensing impact for activating an alarm. The bumper is in the nature of a tubular member such as a pipe suspended parallel to the support surface. The alarm circuit includes a tilt switch that activates upon tilting of the bumper upon impact. In response, the circuit produces an alarm signal delivered to a pair of lamps and a speaker for providing both visual and audible alarms. Such can alert the driver of a forklift, for example, in time to prevent impact with a low clearance structure such as a doorway header. Other preferred aspects of the present invention are disclosed herein.
- 10.FIG. 1 is a pictorial view illustrating the preferred alarm bumper apparatus in accordance with the invention in use;
- 11.FIG. 2 is a partial, exploded, pictorial view of the apparatus of FIG. 1;
- 12.FIG. 3 is a pictorial view of the preferred alarm housing and alarm circuit of the apparatus of FIG. 1 showing the housing cover positioned above the housing;
- 13.FIG. 4 is a partial top plan view of the apparatus of FIG. 1 of another embodiment of the alarm circuit switch;
- 14.FIG. 5 is an electrical diagram of the alarm circuit of the apparatus of FIG. 1; and
- 15.FIG. 6 is a left side elevational view of the apparatus of FIG. 1 shown in use in the tilted position by impact and with the static position shown in phantom lines.
- 16. The drawing figures illustrate preferred
alarm bumper apparatus 10 in accordance with the present invention. Referring in particular to FIGS. 2 and 3,apparatus 10 broadly includesbumper 12,suspension assembly 14 andalarm circuit 16. - 17.
Bumper 12 includestubular body 18,left end cap 20 andright end cap 22.Body 18 is preferably in the nature of four inch PVC pipe about ten feet long although the diameter and length can be selected as needed for particular circumstances.End caps bumper 12 is light weight, economical and easy to work. - 18.
Suspension assembly 14 includes left and right,eyelet fasteners flexible cords Fasteners bumper 12 adjacent the respective ends thereof.Cords fasteners - 19. Referring also to FIG. 5,
alarm circuit 16 includesimpact switch 32,control circuit 34,left lamp 36,right lamp 38 andspeaker 40.Housing 42 enclosesswitch 32,circuit 34 andspeaker 40 underremovable cover 44. As illustrated in the drawing figures,housing 42 is positioned inopening 46 defined in the upper surface ofbumper 12. In the preferred embodiment,housing 42 and the components thereof are positioned withinbumper 12 for greater protection against potential impact and to improve the aesthetic appearance ofbumper 12. - 20.
Impact switch 32 is preferably in the nature of a normally closed, tilt switch. That is, in the static position ofbumper 12 as illustrated in FIG. 1 and by the phantom lines in FIG. 6,switch 32 is in the closed position. Upon the tilting ofbumper 12, indicative of impact,switch 32 is activated to open thereby indicating an alarm condition. - 21. As will be appreciated,
switch 32 can include other types of switches such as those responsive to motion and impact. FIG. 4 illustrates another example in whichswitch 32 is in the nature of aphotoelectric switch 48 positioned adjacent one end ofbumper 12 and outboard thereof.Light emitter 50 such as a low power laser is positioned adjacent the opposed end ofbumper 12 and outboard thereof and oriented to emit light beam 52 for impingement onswitch 48.Switch 48 is activated upon the breaking of beam 52, such indicating thatbumper 12 has experienced an impact. Also,alarm circuit 16 can include more than one switch or more than one type of switch. - 22.
Control circuit 34 is coupled withswitch 32 and responsive to activation thereof for producing an alarm signal. This alarm signal is in the nature of a power signal tolamps speaker 40 in order to energize these components. - 23. As best shown in FIG. 2,
lamps lamps Speaker 40 emits a loud, siren-like audible alarm in order to elicit an immediate response upon activation. - 24.FIGS. 1 and 6 illustrate
apparatus 10 in use in a building such as a warehouseadjacent doorway 54 havingheader 56.Cords 28 suspendbumper 12 with the long axis thereof parallel tofloor 58.Bumper 12 is preferably positioned with the lower edge thereof at the same height as the lower edge ofheader 56 or slightly below, and spaced horizontally about four feet fromheader 56. The spacing of the lower edge ofbumper 12 and the spacing fromheader 56 is a matter of choice depending upon particular circumstances. Also,header 56 is merely an example of a low clearance area. - 25.FIG. 6 illustrates an environment of use for
apparatus 10 in which load 60 being carried byforklift 62 is too tall to fit underheader 56. Asload 60 approachesdoorway 54, it engagesbumper 12 and shiftsbumper 12 from the static position (phantom lines) to the tilted position. When this occurs, switch 48 is activated andcontrol circuit 34 responds by activatinglamps speaker 40. The lights and sound alert the driver offorklift 62 that impact withheader 56 is imminent. That is, the driver is warned in sufficient time to stopforklift 62 to avoid a collision betweenload 60 andheader 56. - 26. In more detail, and referring to FIG. 5,
alarm circuit 16 includes conventional 120VAC/12VDC power supply 64 havingplug 66 for plugging into a convenient source of power in order to supply power at 12VDC to alarmcircuit 16 includingcontrol circuit 34.Switch 32 is normally closed withbumper 12 in the static position. Withswitch 32 closed, transistor Q1 is off because base current by way of resistor R1 (22K) is diverted to ground. - 27. Transistor Q3 is on because of the base current supplied by way of resistor R3 (22K). With Q3 conducting, transistors Q2 and Q4 are off. As a result,
lamps speaker 40 are off. Also, capacitor C1 (470 uF) is charged through resistor R2 (2.2K). - 28. If
bumper 12 receives an impact such that it tilts, then switch 32 opens and base current is supplied to transistor Q1 which begins conducting through resistor R2. When this occurs, capacitor C1 begins to discharge through Q1. This reverse biases Q3 which turns off. - 29. With Q3 off, the voltage at the collector thereof begins to rise through resistor R5 (2.2K). However, capacitor C2 (22 uF) limits this rise through resistor R4 (15K) for about three milliseconds. If
switch 32 again closes during this delay time, Q2 and Q4 remain off, Q1 turns off and Q3 resumes conducting. In this way, transients or momentary operation ofswitch 32 do not trigger activation oflamps speaker 40. - 30. If
switch 32 remains open more than 3 ms, capacitor C2 charges to the supply voltage level. Base current is supplied by way of resistor R7 (15K) to transistor Q2 and by way of resistor R6 (22K) to transistor Q4. Operation of Q4 activateslamps speaker 40. - 31. With transistor Q2 on, the left side of capacitor C1 is clamped to ground in parallel with Q1. Even if
switch 32 recloses, Q2 remains conducting. Also, Q3 remains off until capacitor C1 charges through resistor R3. This takes about eight seconds. At this time, Q3 turns on and the circuit resets. Thus, once an alarm is triggered,lamps speaker 40 remain energized for eight seconds even ifswitch 32 recloses, and turn off at the end of eight seconds even ifswitch 32 is still open.
Claims (19)
1. An alarm bumper apparatus comprising:
a bumper;
a suspension assembly configured for suspending said bumper at a selected height above a support surface and for allowing said bumper to shift upon impact; and
an alarm circuit carried by said bumper and operable for sensing impact by said bumper and responsive thereto for activating an alarm.
2. The apparatus as set forth in , said bumper including a tubular member.
claim 1
3. The apparatus as set forth in , said tubular member including a pipe.
claim 2
4. The apparatus as set forth in , said pipe including PVC pipe.
claim 3
5. The apparatus as set forth in , said suspension assembly including a plurality of spaced fasteners coupled with said bumper.
claim 1
6. The apparatus as set forth in , said suspension assembly further including a plurality of flexible cords respectively coupled with said fasteners.
claim 5
7. The apparatus as set forth in , said flexible cords including chain, said fasteners including eyelet fasteners.
claim 6
8. The apparatus as set forth in , said alarm circuit including a switch and activatable in response to shifting of said bumper and including a control circuit coupled with said switch and responsive to activation thereof for producing an alarm signal.
claim 1
9. The apparatus as set forth in , said switch including a tilt switch.
claim 8
10. The apparatus as set forth in , said switch including a light responsive switch, said alarm circuit further including a light beam emitting device carried by said bumper, spaced from said switch and positioned for directing said light beam onto said switch, said switch being activatable in response to interruption of said light beam, such being indicative of said bumper receiving an impact and shifting as a result.
claim 8
11. The apparatus as set forth in , said alarm circuit further including a lamp carried by said bumper, said lamp illuminating in response to said alarm signal.
claim 8
12. The apparatus as set forth in , further including a pair of said lamps.
claim 11
13. The apparatus as set forth in , said alarm circuit further including a sound emitting device responsive to said alarm signal for producing an audible alarm.
claim 8
14. The apparatus as set forth in , said alarm signal further including timing structure for stopping said alarm signal after a predetermined time.
claim 8
15. The apparatus as set forth in ,
claim 1
said bumper being configured to present a longitudinal axis and opposed ends,
said suspension assembly being configured for orienting said bumper with said axis substantially parallel to a support surface,
said alarm circuit including a switch activatable in response to shifting of said bumper, a control circuit responsive to activation of said switch for producing an alarm signal, and at least one lamp operable for illuminating a response to said alarm signal.
16. The apparatus as set forth in , said alarm circuit including a pair of said lamps respectively positioned at said opposed ends of said bumper.
claim 15
17. The apparatus as set forth in , said alarm circuit further including a sound emitting device responsive to said alarm signal for providing an audible alarm.
claim 16
18. The apparatus as set forth in , said alarm circuit being operable for stopping said alarm signal after a predetermined time.
claim 15
19. The apparatus as set forth in , said bumper being composed of PVC pipe.
claim 14
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/755,610 US20010001233A1 (en) | 1999-06-14 | 2001-01-05 | Low clearance alarm bumper |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/332,482 US6172604B1 (en) | 1999-06-14 | 1999-06-14 | Low clearance alarm bumper |
US09/755,610 US20010001233A1 (en) | 1999-06-14 | 2001-01-05 | Low clearance alarm bumper |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/332,482 Continuation US6172604B1 (en) | 1999-06-14 | 1999-06-14 | Low clearance alarm bumper |
Publications (1)
Publication Number | Publication Date |
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US20010001233A1 true US20010001233A1 (en) | 2001-05-17 |
Family
ID=23298427
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/332,482 Expired - Lifetime US6172604B1 (en) | 1999-06-14 | 1999-06-14 | Low clearance alarm bumper |
US09/755,610 Abandoned US20010001233A1 (en) | 1999-06-14 | 2001-01-05 | Low clearance alarm bumper |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/332,482 Expired - Lifetime US6172604B1 (en) | 1999-06-14 | 1999-06-14 | Low clearance alarm bumper |
Country Status (1)
Country | Link |
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US (2) | US6172604B1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020171557A1 (en) * | 2001-05-18 | 2002-11-21 | Wegener William E. | Security electronic system |
US6915832B2 (en) | 2001-10-25 | 2005-07-12 | Edward J. Stern, Jr. | Protection device for an overhead door |
US20040049959A1 (en) * | 2002-06-06 | 2004-03-18 | Frank Venegas | Overhead hanging clearance bar |
US7797881B2 (en) * | 2005-06-22 | 2010-09-21 | Loitherstein Joel S | Garage door control system |
US7922155B2 (en) * | 2007-04-13 | 2011-04-12 | Honeywell International Inc. | Steam-generator temperature control and optimization |
US8448594B2 (en) * | 2008-09-17 | 2013-05-28 | David Allen Dukes | Vehicle height restrictor and alerting device |
US20120139756A1 (en) * | 2010-11-18 | 2012-06-07 | Djurkovic Ismet N | Height warning system |
US9383275B2 (en) | 2013-06-06 | 2016-07-05 | Sentry Protection Products | Collision sensor assembly for a stationary structure |
BE1024762B1 (en) * | 2016-11-30 | 2018-06-28 | Logi Signs Bvpa | Device for securing an obstacle at height against a collision by a vehicle when driving underneath and the magazine equipped with it |
US11487010B2 (en) * | 2018-09-12 | 2022-11-01 | Research Foundation Of The City University Of New York | Laser ranging over-height vehicle detector system (LARA-OHVD) |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2738496A (en) * | 1952-08-12 | 1956-03-13 | Paul H Armstrong | Sleep inhibiting and control device for vehicles |
US2884623A (en) * | 1957-01-31 | 1959-04-28 | Richard C Murphy | Burglar alarm |
US3716833A (en) * | 1971-12-02 | 1973-02-13 | Sperry Rand Corp | Vehicle height clearance indicating apparatus |
US5011358A (en) * | 1988-10-25 | 1991-04-30 | Andersen Eric T | Height indicator for a fork lift truck |
US4916429A (en) * | 1989-05-19 | 1990-04-10 | Hicks Earl G | Overheight detector system for drive through restaurant |
USD333873S (en) | 1990-01-18 | 1993-03-09 | Mccue Corporation | Protective base rail |
US5149569A (en) | 1990-02-12 | 1992-09-22 | Mccue Corporation | Base member for protective strip assembly |
US5096753A (en) | 1990-02-12 | 1992-03-17 | Mccue Corporation | Protective strip assembly |
US5343739A (en) * | 1993-08-06 | 1994-09-06 | Curry John R | Gantry crane collision avoidance device |
US5390719A (en) * | 1993-08-10 | 1995-02-21 | Barnes; Michael S. | Canopy assembly pivotable by over-height vehicle |
US6002333A (en) * | 1996-03-06 | 1999-12-14 | Hickey; Mark J. | Alarm system to assist in gauging the size of a door opening |
US5841345A (en) * | 1997-07-09 | 1998-11-24 | Kestenberg; Howard J. | Two-way communication device having emergency detecting component |
-
1999
- 1999-06-14 US US09/332,482 patent/US6172604B1/en not_active Expired - Lifetime
-
2001
- 2001-01-05 US US09/755,610 patent/US20010001233A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
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US6172604B1 (en) | 2001-01-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |