AP386A - The automatic safety gate units. - Google Patents

The automatic safety gate units. Download PDF

Info

Publication number
AP386A
AP386A APAP/P/1992/000406A AP9200406A AP386A AP 386 A AP386 A AP 386A AP 9200406 A AP9200406 A AP 9200406A AP 386 A AP386 A AP 386A
Authority
AP
ARIPO
Prior art keywords
gate
cylinder
piston
towards
channel
Prior art date
Application number
APAP/P/1992/000406A
Other versions
AP9200406A0 (en
Inventor
Jack Mishingo Thipe
Original Assignee
Jack Mishingo Thipe
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Jack Mishingo Thipe filed Critical Jack Mishingo Thipe
Priority to APAP/P/1992/000406A priority Critical patent/AP386A/en
Publication of AP9200406A0 publication Critical patent/AP9200406A0/en
Application granted granted Critical
Publication of AP386A publication Critical patent/AP386A/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B43/00—Time locks
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K1/00—Housing animals; Equipment therefor
    • A01K1/0005—Stable partitions
    • A01K1/0017—Gates, doors
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B51/00—Operating or controlling locks or other fastening devices by other non-mechanical means
    • E05B51/02—Operating or controlling locks or other fastening devices by other non-mechanical means by pneumatic or hydraulic means
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B65/00—Locks or fastenings for special use
    • E05B65/0007—Locks or fastenings for special use for gates
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F1/00—Closers or openers for wings, not otherwise provided for in this subclass
    • E05F1/002—Closers or openers for wings, not otherwise provided for in this subclass controlled by automatically acting means
    • E05F1/008—Closers or openers for wings, not otherwise provided for in this subclass controlled by automatically acting means by time control
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F1/00—Closers or openers for wings, not otherwise provided for in this subclass
    • E05F1/02—Closers or openers for wings, not otherwise provided for in this subclass gravity-actuated, e.g. by use of counterweights
    • E05F1/025—Closers or openers for wings, not otherwise provided for in this subclass gravity-actuated, e.g. by use of counterweights with rectilinearly-moving counterweights
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B11/00—Means for allowing passage through fences, barriers or the like, e.g. stiles
    • E06B11/02—Gates; Doors
    • E06B11/04—Gates; Doors characterised by the kind of suspension
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B53/00—Operation or control of locks by mechanical transmissions, e.g. from a distance
    • E05B53/001—Foot-operation
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
    • E05C17/00—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith
    • E05C17/02—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means
    • E05C17/46—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means in which the wing or a member fixed thereon is engaged by a movable fastening member in a fixed position; in which a movable fastening member mounted on the wing engages a stationary member
    • E05C17/48—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means in which the wing or a member fixed thereon is engaged by a movable fastening member in a fixed position; in which a movable fastening member mounted on the wing engages a stationary member comprising a sliding securing member
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/40—Application of doors, windows, wings or fittings thereof for gates

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Zoology (AREA)
  • Animal Husbandry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Power-Operated Mechanisms For Wings (AREA)
  • Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)

Abstract

This invention relates to an automatic safety gate closer for closing a gate a predetermined time interval after a vehicle or individual has passed therethrough. The gate is biased to close when opened by a counterweight. A timer is connected to a catch, which holds the gate open and releases the gate after a predetermined time period allowing it to close. The timer is pneumatic and has a piston reciprocatable within a cylinder, a connecting rod corrected to the cylinder and to the catch, a compression spring urging the piston from a bottom position to a top position and a valve which allows air to bleed from the top of the cylinder.

Description

AUTOMATIC SAFETY GATE COMPONENT
INTRODUCTION
THIS INVENTION relates to an automatic safety gate closer and to a timer for activating a closing mechanism for a gate after a horse drawn vehicle or motor vehicle has passed through the gate.
BACKGROUND TO THE INVENTION
C-ates to farms and other gates in rural and underdeveloped areas are often left open by persons /driving or
AP Ο Ο Ο 3 8 6
- 3 driving or passing therethrough. The reason for this is that it is usually inconvenient and tine consuming to stop a vehicle and close a gate to resume a journey.
Where farm gates and other gates are left open stock particularly large animals such as cattle and the like can wander through the gate often straying considerable distances. These unattended animals present a considerable hazard to road users specially to drivers and passengers in motor vehicles and particularly at night.
Timing devices for operating spring loaded gate closing mechanisms are known. Such timing devices tend however to be intricate and are consequently expensive to manufacture and to maintain. Because of this they frequently break and the gate needs to be closed manually. This in itself presents a problem for travellers seeing such a timer will automatically assume that the gate will close behind them thus exacerbating the problem of straying livestock and other animals.
/OBJECT OF bad original
AP000386
- 4 OBJECT OF THE INVENTION
It is an object of this invention to provide an automatic safety gate closer and to a timer for regulating the closing of a gate after the passage of a vehicle therethrough, which at least partly alleviates the abovementioned difficulty.
SUMMARY OF THE INVENTION
In accordance with this invention there is provided an automatic safety gate closer comprising a gate having a biasing mechanism which urges the gate from an open position into a closed position and a timer which is operable to release a catch holding the gate in its open position thereby enabling the gate to close; said biasing mechanism comprising a first arm which projects operatively rearwardly from the 'gate, a second arm which projects operatively rearwardly from a gate post to which the gate is hingedly hung and parallel to the first arm, a flexible connector element having a first end secured to the first arm and a second end passing through an aperture in the second arm, and /a weight bad original 4
APO00386
- 5 a weight attached to the second end of the connector; said timer comprising a cylinder having a first end and a second end; a piston reciprocatable within the cylinder; a compression spring within the cylinder urging the piston towards the first end of the cylinder; a connecting rod having a first end connected to the piston and a second end protruding from the second end cf the cylinder; a catch means towards the second end of the connecting rod, said catch means operable to engage an end of a gate when the piston is located towards the second end of the cylinder and release the gate when the piston is towards the first end of the cylinder; and an air valve located towards the first end of the cylinder, the valve is operable to allow air to enter the cylinder when the piston is moved towards the second end of the cylinder and to allow air to bleed slowly from the cylinder as the piston returns towards the first end of the cylinder under action from the compression spring thereby releasing the gate and enabling it to close.
/There is bad original
AP Ο Ο Ο 3 8 6
There is also provided for the piston to be in the form of a plunger having a diaphragm located towards the first end of the connecting rod, for the second end of the connecting rod to have a foot plate which is depressed, in use, by a foot of a person opening the gate to draw the piston towards the second end of the cylinder against the force of the compression spring, for the air valve to be adjustable to selectively increase and decrease the / rate at which air escapes from the cylinder thereby altering the time period within which the gate is held open and for the valve to be operable to release air from the cylinder by means of a linkage connected to a clock timing means.
There is further provided for the flexible connector element of the biasing mechanism to be a length of chain, alternatively a length of cable.
I (
A further feature of the invention provides for the gate to be retained in its closed position by a catch which is secured to a gate post, said catch comprising a horizontal channel in the operatively inner face of the post and a pair of spaced apart /downwardly depending
BAD
ORIGINAL
AP 0 0 0 3 8 6
- 7 downwardly depending wings hingedly the operatively upper flange of the channel, the length cf the wings being greater than the width of the channel and the operative free ends of each wing being orientated towards each other, in use when a bar projecting from the gate enters the channel, the wing on the side of the channel entered pivots about its hinge allowing the bar to enter further into the channel and when the bar passes beyond the operatively lower free end of the wing, the wing returns to its original position and the bar and consequently the gate is secured in its closed position.
The invention also extends to a timer, and to a biasing mechanism, and to a catch means as defined above .
BRIEF DESCRIPTION OF THE DRAWINGS connected to
Preferred embodiments of the invention will be described below by way of example only, and with reference to the accompanying drawings, in which:
/Figure 1 is
bad original
AP Ο Ο Ο δ 8 6
Figure 1 is a side elevational view of a first embodiment of a timer operable to release a catch holding open a gate against a biasing force;
Figure 2 is a sectional side view of the timer of Figure 1;
/Figure 3 is an isometric view of the embodiment of a timer of Figures 1 and 2 mounted to a mounting post adjacent a gate; and
Figure 4 is an isometric view of a second embodiment of a timer according to the invention .
DETAILED DESCRIPTION OF THE DRAWINGS
Referring to Figures 1 and 2, a timer (1) operable ί to release a catch (2) holding open a gate (not shown) against a biasing force thereby enabling the gate to close comprises a cylinder (3) having a first end (4) and a second end (5). A piston (6) is reciprocatable within the cylinder (3). A /compression spring
BAD ORIGINAL t
AP Ο Ο Ο 3 8 β
- 9 compression spring (7j within the cylinder (3) urges the piston (6) towards the first end (4) of the cylinder (3).
A connecting rod (3) has a first end (9) connected to the piston (6) and a second end (10) which protrudes from the second end (5) of the cylinder (3). The catch (2) is located towards the second end (10) of the connecting rod (8). The catch means (2) is operable to engage and end (not shown) of a gate (not shown) when the piston (6) is located towards the second end (5) of the cylinder (3) and releases the gate (not shown) when the piston (6) is towards the first end (4) of the cylinder (3). An air valve (11) is located towards the first end (4) of the cylinder (3). The valve (11) is operable to allow air to enter the cylinder
(3) when the piston (6) is moved
end (5) of the cylinder (3) . The
operable to allow air to bleed
cy1inder (3) as the piston (6) re
The valve (4) is also first end (4) of the cylinder (3) under action from the compression spring (7) thereby releasing the gate (not shown) and enabling it to close.
/The piston bad original &
AP Ο Ο Ο 3 8 6
The piston (6) is in the form of a plunger having a
diaphragm located towards the first end of the
connecting rod ( 3) . The second end of the
connection rod (10) has a foot plate (12) pending
laterally therefrom . The foot plate (12) is
depressed in use by the foot of a person opening
the gate tc ι draw the piston (6) towards the second
end of the cylinder (3] ι against the force of a
compression spring (7).
The air valve (11) is adjustable in use to selectively increase and decrease the rate at which air escapes from the cylinder (3) thereby altering the time period within which the gate is held open by the catch (2). The valve (11) may also be openable to release air from the cylinder (3) by means of a linkage connected to a clock timing means .
Referring to Figure 3, the a vertical post (13). The by a protective screen (14) of the connecting rod operatively lower end (15) timer (1) is mounted to cylinder (3) is covered and the second end (10) (8) projects from the of the screen. The end /(10) of sad original
AP Ο Ο Ο 3 8 6
- 11 (10) of the connecting rod (3) has a laterally extending guide (16) which is cooperable with a set of rails (17) also mounted operatively vertically to the post (13). When the foot plate (12) is depressed and the piston (not shown) and connecting rod (S) are moved operatively downwardly the guide (16) ensures that the connecting rod moves in a vertical direction only.
Referring to Figure 4, an alternate embodiment of a timer (20) according to the invention is shown. In this embodiment the piston (21) has an operatively upper end (22), an operatively lower end (23) and an air release valve (24) located at its upper end (22). A connecting rod (25) which has a foot plate (26) and catch (27) projects from the operatively lower ends (23) of the cylinder (21) . In this embodiment a clock timing means (28) is used to allow air to be released through the valve (24) from the cylinder (21) . The timing means (28) has an operatively vertically orientated arm (29) which is rotatable. One end (30) of the arm (29) has a pin (31) secured thereto. As the arm (29) rotates so does the pin (31) until the pin (31) depresses a /release mechanism
bad original
AP Ο Ο Ο 3 8 6
- 12 release mechanism (32) on the valve (24) thereby allowing air to escape rapidly from the cylinder. The ti-er (23) is linked to the foot plate (26) by a flexible cable (33). In use, then the foot plate (26) is depressed, the downward movement of the foot plate is transferred to an opposite end (34) of the arm (29) through the cable (33). This causes the arm (29) to rotate in a clockwise direction. Once wound the timer regulates the rate at which the arm (29) rotates in a counter clockwise direction until the pin (31) depresses the valve means (32) and allows the piston to move towards the first end (22) of the cylinder (21).
Referring specifically to Figures 3 and 4, when a gate (not shown) is opened against the biasing of a spring or similar mechanism arranged to close the gate. The person opening the gate depresses the foot plate. As the foot plate is depressed this draws the piston operatively downwardly away from the first end of the cylinder towards the second end of the cylinder and simultaneously compresses a compression spring.
/When the bad
ORIGINAL
AP Ο Ο Ο 3 8 β
- 13 When the foot plate is depressed with the gate held open the catch engages the operatively lower end of the gate thereby holding it open. As air bleeds from the valve the piston moves towards the first end of the cylinder and, after a period of time, the catch is lifted operatively upwardly to release the gate which can close under spring biasing. The rate at which air is released from the valve can be adjusted thereby lengthening or reducing the length of time which the gate is held open. It is envisaged that a timer according to the invention will be easy to maintain and install and will go a long way to alleviating the disadvantages mentioned above .

Claims (7)

  1. /CLAIMS
    BAD ORIGINAL-
    AP Ο Ο Ο 3 8 β
    - 14 CLAIMS
    1. An automatic safety gate closer comprising a gate having a biasing mechanism which urges the gate from an open position into a closed position and a timer which is operable to release a catch holding the gate in its open position thereby enabling the gate to close; said biasing mechanism comprising a first arm which projects operatively rearwardly from the 'gate, a second arm which projects operatively rearwardly from a gate post to which the gate is hingedly hung and parallel to the first arm, a flexible connector element having a first end secured to the first arm and a second end passing through an aperture in the second arm, and a weight attached to the second end of the connector; said timer comprising a cylinder having a first end and a second end; a piston reciprocatable within the cylinder; a compression spring within the cylinder urging the piston towards the first end of the cylinder; a connecting rod having a first end connected to the piston and a /second end
    BAD OFUG|NAL
    AP Ο Ο Ο 3 8 6
    - 15 second end protruding from the second end of the cylinder; a catch means towards the second end of the connecting rod, said catch means operable to engage an end of a gate when the piston is located towards the second end of the cylinder and release the gate when the piston is towards the first end of the cylinder; and an air valve located towards the first end of the cylinder, the valve is operable to allow air to enter the cylinder when the piston is moved towards the second end of the cylinder and to allow air to bleed slowly from the cylinder as the piston returns towards the first end of the cylinder under action from the compression spring thereby releasing the gate and enabling it to close.
  2. 2. An automatic safety gate closer as claimed in claim 1 in which the piston is in the form of a plunger having a diaphragm located towards the first end of the connecting rod.
  3. 3. An automatic safety gate closer as claimed in claim 1 or in claim 2 in which the second end /of the
    BAD OB*giNAL St
    AP Ο Ο Ο 3 8 β
    - 16 of the connecting rod has a foot plate which is depressed, in use, by a foot of a person opening the gate to draw the piston towards the second end of the cylinder against the force of the compression spring.
  4. 4. An automatic safety gate closer as claimed in any one of claims 1 to 3 in which the air valve is adjustable to selectively increase and decrease the rate at which air escapes from the cylinder thereby altering the time period within which the gate is held open.
    5 . An automatic safety gate closer as claimed in any one of claims 1 to 3 in which the valve is operable to release air from the cylinder by
    means of a linkage connected to a clock timing means .
    An automatic safety gate closer any one of the preceding claims flexible connector element of mechanism is a length of chain.
    as claimed in in which the the biasing /7. An automatic
    BAD ORIGINAL ♦:
    APO00386
    - 17 An automatic safety gate closer as claimed in any one of claims 1 to 5 in which the flexible connector element of the biasing mechanism is a length of cable.
    An automatic safety gate closer as claimed in any one of the preceding claims in which the gate is retained in its closed position by a catch which is secured to a gate post, said catch comprising a horizontal channel in the operatively inner face of the post and a pair of spaced apart downwardly depending wings hingedly connected to the operatively upper flange of the channel, the length of the wings being greater than the width of the channel and the operative free ends of each wing being orientated towards each other, in use when a bar projecting from the gate enters the channel, the wing on the side of the channel entered pivots about its hinge allowing the bar to enter further into the channel and when the bar passes beyond the operatively lower free end of the wing, the wing returns to its /original position
    BAD ORIGINAL &
    AP Ο Ο Ο 3 8 6
    - 18 original position and the bar and consequently the gate is secured in its closed position.
  5. 9. A biasing mechanism for an automatic safety gate closer as claimed in any one of the preceding claims comprising a first arm which projects operatively rearwardly from the gate, a second arm which projects operatively rearwardly from a gate post to which the gate is hingedly hung and parallel to the first arm, a flexible connector element having a first end secured to the first arm and a second end passing through an aperture in the second arm, and a weight attached to the second end of the connector.
  6. 10. A timer for an automatic safety gate closer as any one of claims 1 to 8 comprising having a first end and a second piston reciprocatable within the a compression spring within the cylinder urging the piston towards the first end of the cylinder; a connecting rod having a first end connected to the piston and a ciaimea in a cylinder end; a cylinder;
    /second end BAD original
    AP Ο Ο Ο 3 8 6
    - 19 second end protruding fron the second end of the cylinder; a catch reans towards the second end of the connecting rod, said catch neans operable to engage an end of a gate when the piston is located towards the second end of the cylinder and release the gate when the piston is towards the first end of the cylinder; and an air valve located towards the first end of the cylinder, the valve is operable to allow air to enter the cylinder when the piston is moved towards the second end of the cylinder and to allow air to bleed slowly from the cylinder as the piston returns towards the first end of the cylinder under action from the compression spring thereby releasing the gate and enabling it to close.
  7. 11. A catch for an automatic safety gate closer as claimed in any one of claims 1 to S comprising a horizontal channel in the operatively inner face of the post and a pair of spaced apart downwardly depending wings hingedly connected to the operatively upper flange of the channel, the length of the wings being greater /than the bad 0R'6'nAU
    APO 0 0 3 8 6
    - 20 than the width of the channel ar.d the operative free ends of each wing being orientated towards each other, in use when a bar projecting from the gate enters the channel, the wing on the side of the channel entered pivots about its hinge allowing the bar to enter further into the channel and when the bar passes beyond the operatively lower free end of the wing, the wing returns to its original position and the bar and consequently the gate is secured in its closed position.
APAP/P/1992/000406A 1992-06-26 1992-06-26 The automatic safety gate units. AP386A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
APAP/P/1992/000406A AP386A (en) 1992-06-26 1992-06-26 The automatic safety gate units.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
APAP/P/1992/000406A AP386A (en) 1992-06-26 1992-06-26 The automatic safety gate units.

Publications (2)

Publication Number Publication Date
AP9200406A0 AP9200406A0 (en) 1992-07-31
AP386A true AP386A (en) 1995-07-28

Family

ID=3460675

Family Applications (1)

Application Number Title Priority Date Filing Date
APAP/P/1992/000406A AP386A (en) 1992-06-26 1992-06-26 The automatic safety gate units.

Country Status (1)

Country Link
AP (1) AP386A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088496A1 (en) * 1982-03-05 1983-09-14 Mitsubishi Denki Kabushiki Kaisha Feedback automatic control apparatus
EP0138423A2 (en) * 1983-09-23 1985-04-24 RENOLD Plc Automatic or manually opening gate
EP0246213A1 (en) * 1986-05-09 1987-11-19 Murray Purves Automatic gate opening and closing device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088496A1 (en) * 1982-03-05 1983-09-14 Mitsubishi Denki Kabushiki Kaisha Feedback automatic control apparatus
EP0138423A2 (en) * 1983-09-23 1985-04-24 RENOLD Plc Automatic or manually opening gate
EP0246213A1 (en) * 1986-05-09 1987-11-19 Murray Purves Automatic gate opening and closing device

Also Published As

Publication number Publication date
AP9200406A0 (en) 1992-07-31

Similar Documents

Publication Publication Date Title
US5109802A (en) Animal headgate with an automatic locking mechanism
US4080749A (en) Animal trap
US4302908A (en) Livestock detaining gate
US4682441A (en) Animal trap
AP386A (en) The automatic safety gate units.
US4116166A (en) Automatic cattle gate assembly
US2571487A (en) Cattle chute gate
US5626100A (en) Universal headgate
EP0246213B1 (en) Automatic gate opening and closing device
US2232604A (en) Animal trap
US1973020A (en) Mail box
US4962953A (en) Animal gate latch mechanism
US5109626A (en) Animal trap
US4632063A (en) Animal holding gate with automatic closing operation
US4308682A (en) Humane animal trap
US2599017A (en) Rattrap
US2790666A (en) Latch structure
US4471559A (en) Humane animal trap
US1973280A (en) Farm gate
CN210580661U (en) Trigger mechanism of animal catching cage
US5178097A (en) Head gate for calf chutes
US971530A (en) Animal-trap.
US2266991A (en) Animal holding apparatus
US2997982A (en) Animal restraining gate
US4051997A (en) Mail reminder